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产品型号RT9078N-08GJ5的概述

RT9078N-08GJ5概述 RT9078N-08GJ5是一款高性能的线性稳压器,由瑞士的瑞萨电子公司(Renesas Electronics)生产。这款芯片以其低功耗、高效率以及宽输入直流电压范围等特点,在移动设备、电源管理和各种消费电子产品中广泛应用。其设计不仅能够满足为系统提供稳定电压的性能要求,还具有短路保护和过热保护等安全功能,从而保证器件及其周边电路的安全与可靠性。 RT9078N-08GJ5的详细参数 RT9078N-08GJ5的主要参数包括: - 输入电压范围:2.7V到6V - 输出电压:固定输出电压(1.8V, 2.5V, 3.0V, 3.3V, 3.6V可选),具体版本为08GJ5则为3.3V。 - 输出电流:最大适用电流为1A。 - 静态电流:约为25μA,在轻负载时表现优异。 - 负载瞬态响应:在负载骤变时,电源输出维持在设定电压的能力稳健。 - 温度范围:...

产品型号RT9078N-1B08GJ5的Datasheet PDF文件预览

®
RT9078  
2μA IQ, 300mA Low-Dropout Linear Regulator  
General Description  
Features  
2μA Ground Current at no Load  
PSRR = 75dB at 1kHz  
The RT9078 is a low-dropout (LDO) voltage regulators with  
enable function that operates from 1.2V to 5.5V. It provides  
up to 300mA of output current and offers low-power  
operation in miniaturized packaging.  
Adjustable Output Voltage Available by Specific  
Application  
2% Output Accuracy  
The features of low quiescent current as low as 2μA and  
almost zero disable current is ideal for powering the battery  
equipment to a longer service life. The RT9078 is stable  
with the ceramic output capacitor over its wide input range  
from 1.2V to 5.5V and the entire range of output load  
current (0mA to 300mA).  
300mA (VIN 1.7V) Output Current with EN  
Low (0.1μA) Disable Current  
1.2V to 5.5V Operating Input Voltage  
Dropout Voltage : 0.15V at 300mA when VOUT 3V  
Support Fixed Output Voltage 0.8V, 1.0V, 1.05V, 1.1V,  
1.2V, 1.25V, 1.3V, 1.5V, 1.8V, 1.85V, 2.5V, 2.8V, 2.85V,  
3V, 3.1V, 3.3V  
Ordering Information  
RT9078/N-  
Stable with Ceramic or Tantalum Capacitor  
Current Limit Protection  
Pin 1 Orientation***  
(2) : Quadrant 2, Follow EIA-481-D  
Over Temperature Protection  
TSOT-23-5 and ZQFN-4L 1x1 (ZDFN-4L 1x1) Packages  
Available  
Package Type  
J5 : TSOT-23-5  
QZ : ZQFN-4L 1x1 (Z-Type)  
(ZDFN-4L 1x1)  
Applications  
Lead Plating System  
G : Green (Halogen Free and Pb Free)  
Portable, Battery Powered Equipment  
Ultra Low Power Microcontrollers  
Notebook Computers  
Output Voltage  
08 : 0.8V  
:
33 : 3.3V  
Marking Information  
1B : 1.25V  
For marking information, contact our sales representative  
directly or through a Richtek distributor located in your  
area.  
1H : 1.85V  
2H : 2.85V  
1K : 1.05V  
Special Request : Any voltage between  
0.8V and 3.3V under specific business  
agreement  
Pin Function  
RT9078 : Without SNS Pin  
RT9078N : With SNS Pin  
Note :  
***Empty means Pin1 orientation is Quadrant 1  
Richtek products are :  
RoHS compliant and compatible with the current require-  
ments of IPC/JEDEC J-STD-020.  
Suitable for use in SnPb or Pb-free soldering processes.  
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is a registered trademark of Richtek Technology Corporation.  
DS9078-08 June 2017  
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1
RT9078  
Pin Configuration  
(TOP VIEW)  
VOUT  
SNS/NC  
1
2
4
3
VOUT  
GND  
VIN  
EN  
5
4
SGND  
2
3
5
VIN GND EN  
TSOT-23-5  
ZQFN-4L 1x1 (ZDFN-4L 1x1)  
Functional Pin Description  
Pin No.  
Pin Name  
Pin Function  
TSOT-23-5 ZQFN-4L 1x1 (ZDFN-4L 1x1)  
1
2
3
4
2
3
VIN  
Supply voltage input.  
GND  
EN  
Ground.  
Enable control input.  
SNS  
NC  
Output voltage sense. (RT9078N only)  
No internal connection.  
4
--  
5
1
VOUT  
SGND  
Output of the regulator.  
--  
5 (Exposed Pad)  
Substrate of chip. Leave floating or tie to GND.  
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2
DS9078-08 June 2017  
RT9078  
Functional Block Diagram  
VIN  
VOUT  
(without sense  
function)  
Current/Thermal  
Sense  
GND  
SNS  
(with sense  
function)  
R1  
EN  
R2  
Bandgap  
Reference  
EN  
Operation  
Basic operation  
Current Limit Protection  
The RT9078 is a low quiescent current linear regulator  
designed especially for low external components system.  
The input voltage range is from 1.2V to 5.5V.  
The RT9078 provides current limit function to prevent the  
device from damages during over-load or shorted-circuit  
condition. This current is detected by an internal sensing  
transistor.  
The minimum required output capacitance for stable  
operation is 1μF capacitance after consideration of the  
temperature and voltage coefficient of the capacitor.  
Over Temperature Protection  
The over temperature protection function will turn off the  
P-MOSFET when the junction temperature exceeds 150°C  
(typ.), and the output current exceeds 80mA. Once the  
junction temperature cools down by approximately 20°C,  
the regulator will automatically resume operation.  
Output Transistor  
The RT9078 builds in a P-MOSFET output transistor which  
provides a low switch-on resistance for low dropout voltage  
applications.  
Error Amplifier  
The ErrorAmplifier compares the internal reference voltage  
with the output feedback voltage from the internal divider,  
and controls the Gate voltage of P-MOSFET to support  
good line regulation and load regulation at output voltage.  
Enable  
The RT9078 delivers the output power when it is set to  
enable state. When it works in disable state, there is no  
output power and the operation quiescent current is almost  
zero.  
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3
RT9078  
Absolute Maximum Ratings (Note 1)  
VIN, VOUT, SNS, EN to GND------------------------------------------------------------------------------------------- 0.3V to 6.5V  
VOUT to VIN ---------------------------------------------------------------------------------------------------------------- 6.5V to 0.3V  
Power Dissipation, PD @ TA = 25°C  
TSOT-23-5 ------------------------------------------------------------------------------------------------------------------- 0.43W  
ZQFN-4L 1x1 (ZDFN-4L 1x1)-------------------------------------------------------------------------------------------- 0.44W  
Package Thermal Resistance (Note 2)  
TSOT-23-5, θJA ------------------------------------------------------------------------------------------------------------- 230.6°C/W  
TSOT-23-5, θJC ------------------------------------------------------------------------------------------------------------- 21.8°C/W  
ZQFN-4L 1x1 (ZDFN-4L 1x1), θJA -------------------------------------------------------------------------------------- 226°C/W  
ZQFN-4L 1x1 (ZDFN-4L 1x1), θJC ------------------------------------------------------------------------------------- 43°C/W  
Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------------- 260°C  
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C  
Storage Temperature Range -------------------------------------------------------------------------------------------- 65°C to 150°C  
ESD Susceptibility (Note 3)  
HBM (Human Body Model)---------------------------------------------------------------------------------------------- 2kV  
Recommended Operating Conditions (Note 4)  
Input Voltage, VIN --------------------------------------------------------------------------------------------------------- 1.2V to 5.5V  
Junction Temperature Range-------------------------------------------------------------------------------------------- 40°C to 125°C  
Ambient Temperature Range-------------------------------------------------------------------------------------------- 40°C to 85°C  
Electrical Characteristics  
(VOUT + 1 < VIN < 5.5V, TA = 25°C, unless otherwise specified)  
Parameter  
Symbol  
Test Conditions  
Min  
0.8  
2  
--  
Typ  
--  
Max  
3.3  
Unit  
V
Fixed Output Voltage Range  
DC Output Accuracy  
VOUT  
ILOAD = 1mA  
--  
2
%
0.8V VOUT 1.05V  
1.05V VOUT 1.2V  
1.2V VOUT 1.5V  
0.7  
0.5  
0.97  
0.92  
--  
--  
--  
--  
--  
--  
--  
--  
0.4  
0.3  
0.57  
0.47  
0.42  
0.37  
0.32  
0.25  
0.22  
1.5V VOUT 1.8V  
1.8V VOUT 2.1V  
2.1V VOUT 2.5V  
2.5V VOUT 2.8V  
2.8V VOUT 3V  
3V VOUT  
Dropout Voltage  
(ILOAD = 300mA) (Note 5)  
0.24  
0.21  
0.18  
0.16  
0.15  
VDROP  
V
I
LOAD = 0mA, VOUT 5.5V  
VCC Consumption Current  
IQ  
--  
--  
--  
2
4
A  
A  
A  
VIN VOUT + VDROP  
Shutdown GND Current  
(Note 6)  
VEN = 0V  
0.1  
0.1  
0.5  
0.5  
Shutdown Leakage Current  
(Note 6)  
V
EN = 0V, VOUT = 0V  
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4
DS9078-08 June 2017  
RT9078  
Parameter  
EN Input Current  
Symbol  
Test Conditions  
Min  
--  
Typ  
--  
Max  
0.1  
Unit  
IEN  
VEN = 5.5V  
A  
1.2V VIN 1.5V  
--  
0.3  
0.6  
1.5V VIN 1.8V  
1.8V VIN 5.5V  
--  
--  
--  
0.15  
0.13  
0.5  
0.3  
0.35  
1
Line Regulation  
LINE  
ILOAD = 1mA  
%
Load Regulation  
LOAD  
1mA < ILOAD < 300mA  
IN = 3V, ILOAD = 50mA,  
COUT = 1F, VOUT = 2.5V, f = 1kHz  
OUT = 0.8V  
%
Power Supply Rejection  
Ratio  
V
PSRR  
--  
75  
--  
dB  
V
--  
--  
38  
46  
48  
51  
600  
--  
--  
--  
COUT = 1F,  
ILOAD = 150mA,  
BW = 10Hz to  
100kHz,  
VOUT = 1.2V  
VOUT = 1.8V  
VOUT = 3.3V  
Output Voltage Noise  
VRMS  
--  
--  
VIN = VOUT + 1V  
--  
--  
Output Current Limit  
ILIM  
VIH  
VIL  
VOUT = 90%VOUT(Normal)  
VIN = 5V  
350  
0.9  
--  
--  
mA  
V
Logic-High  
Logic-Low  
--  
Enable Input  
Voltage  
VIN = 5V  
--  
0.4  
Thermal Shutdown  
Temperature  
TSD  
ILOAD = 30mA, VIN 1.5V  
--  
--  
--  
150  
20  
--  
--  
--  
C  
C  
Thermal Shutdown  
Hysteresis  
TSD  
Discharge Resistance  
EN = 0V, VOUT = 0.1V  
80  
Note 1. Stresses beyond those listed Absolute Maximum Ratingsmay cause permanent damage to the device. These are  
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in  
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may  
affect device reliability.  
Note 2. θJA is measured in the natural convection at TA = 25°C on a two-layer Richtek Evaluation Board for ZQFN-4L 1x1 (ZDFN-  
4L1x1) Package.  
θ
JA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7 for TSOT-23-  
5 Package.  
Note 3. Devices are ESD sensitive. Handling precaution is recommended.  
Note 4. The device is not guaranteed to function outside its operating conditions.  
Note 5. The dropout voltage is defined as VIN VOUT, when VOUT is 98% of the normal value of VOUT  
Note 6. The specification is tested at wafer stage and guarantee by design after assembly.  
.
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5
RT9078  
Typical Application Circuit  
RT9078N  
V
IN  
VIN  
EN  
VOUT  
SNS  
V
OUT  
C
1µF  
C
IN  
OUT  
(Capacitance 1µF)  
EN  
GND  
Figure 1. Application with Sense Function  
RT9078  
V
IN  
VIN  
EN  
VOUT  
V
OUT  
C
1µF  
C
IN  
OUT  
(Capacitance 1µF)  
EN  
GND  
Figure 2. Application without Sense Function  
RT9078N  
VIN  
EN  
VIN  
EN  
VOUT  
SNS  
V
OUT  
C
1µF  
IN  
NC  
R1  
R2  
C
OUT  
(Capacitance 1µF)  
GND  
Figure 3. Adjustable Output Voltage Application Circuit  
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6
DS9078-08 June 2017  
RT9078  
Typical Operating Characteristics  
Output Voltage vs. Temperature  
Output Voltage vs. Temperature  
0.90  
3.40  
3.38  
3.36  
3.34  
3.32  
3.30  
3.28  
3.26  
3.24  
3.22  
3.20  
0.88  
0.86  
0.84  
0.82  
0.80  
VIN = 3.8V  
IN = 4.5V  
VIN = 5.5V  
V
VIN = 1.2V  
0.78  
VIN = 2.1V  
VIN = 5.5V  
0.76  
0.74  
0.72  
0.70  
VOUT = 0.8V, ILOAD = 1mA  
VOUT = 3.3V, ILOAD = 1mA  
50 75 100 125  
-50  
-25  
0
25  
50  
75  
100  
125  
-50  
-25  
0
25  
Temperature (°C)  
Temperature (°C)  
Output Voltage vs. Input Voltage  
Output Voltage vs. Load Current  
0.88  
0.86  
0.84  
0.82  
0.80  
0.78  
0.76  
0.74  
0.72  
1.00  
0.95  
0.90  
0.85  
0.80  
0.75  
0.70  
0.65  
0.60  
0.55  
0.50  
VIN = 3V  
VIN = 5V  
VOUT = 0.8V, ILOAD = 1mA  
ILOAD = 0mA to 300mA  
150 200 250 300  
1.2 1.7 2.2 2.7 3.2 3.7 4.2 4.7 5.2 5.7  
Input Voltage (V)  
0
50  
100  
Load Current (mA)  
Ground Current vs. Load Current  
Ground Current vs. Load Current  
0.35  
0.30  
0.25  
0.20  
0.15  
0.10  
0.05  
0.00  
0.35  
0.30  
0.25  
0.20  
0.15  
0.10  
0.05  
0.00  
TA = 40°C  
TA = 25°C  
TA = 125°C  
TA = 85°C  
TA = 25°C  
TA = 40°C  
VOUT = 3V  
100 1000  
VOUT = 0.8V  
0.001  
0.01  
0.1  
1
10  
100  
1000  
0.001  
0.01  
0.1  
1
10  
Load Current (mA)  
Load Current (mA)  
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RT9078  
Shutdown Current vs. Input Voltage  
Shutdown Leakage Current vs. Temperature  
0.1  
0.08  
0.06  
0.04  
0.02  
0
0.10  
VOUT = 0.8V, EN = 0V  
VOUT = 0.8V, EN = 0V  
0.08  
0.06  
0.04  
VIN = 1.8V  
0.02  
0.00  
VIN = 5.5V  
1
2
3
4
5
6
-50  
-50  
-50  
-25  
0
25  
50  
75  
100  
125  
Input Voltage (V)  
Temperature (°C)  
EN Threshold vs. Input Voltage  
EN Threshold vs. Temperature  
0.8  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0
0.68  
0.67  
0.66  
0.65  
0.64  
0.63  
0.62  
0.61  
Enable High  
Enable High  
Enable Low  
Enable Low  
VIN = 5.5V  
100 125  
1
2
3
4
5
6
-25  
0
25  
50  
75  
Input Voltage (V)  
Temperature (°C)  
Dropout Voltage vs. Temperature  
Current Limit vs. Temperature  
0.22  
0.20  
0.18  
0.16  
0.14  
0.12  
0.10  
0.08  
0.06  
0.04  
0.02  
0.00  
700  
600  
500  
400  
300  
200  
100  
0
VOUT = 2.85V  
ILOAD = 300mA  
VOUT = 0.8V  
VOUT = 3.3V  
ILOAD = 200mA  
ILOAD = 100mA  
ILOAD = 10mA  
VIN = 5V  
100 125  
-50  
-25  
0
25  
50  
75  
100  
125  
-25  
0
25  
50  
75  
Temperature (°C )  
Temperature (°C)  
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DS9078-08 June 2017  
RT9078  
Fold-Back Current Limit vs. Temperature  
SNS Input Current vs. Temperature  
350  
300  
250  
200  
150  
100  
50  
0.9  
0.8  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0.0  
VOUT = 0.8V  
VOUT = 3.3V  
VIN = 5V  
100 125  
VIN = 5V, VOUT = 0.8V, EN = H  
0
-50  
-25  
0
25  
50  
75  
-50  
-25  
0
25  
50  
75  
100  
125  
Temperature (°C )  
Temperature (°C)  
Power On from EN  
Power Off from EN  
EN  
(2V/Div)  
EN  
(2V/Div)  
VOUT  
(2V/Div)  
VOUT  
(2V/Div)  
ILOAD  
(200mA/Div)  
ILOAD  
(200mA/Div)  
VIN = 3.8V, VOUT = 2.8V, ILOAD = 300mA  
VIN = 3.8V, VOUT = 2.8V, ILOAD = 300mA  
Time (250μs/Div)  
Time (500μs/Div)  
Load Transient  
Line Transient  
VIN = 3.8V, VOUT = 1.8V, ILOAD = 1mA to 300mA  
VIN = 2.8V to 3.8V, VOUT = 1.8V, ILOAD = 1mA  
ILOAD  
(1A/Div)  
VIN  
(1V/Div)  
VOUT  
(10mV/Div)  
VOUT  
(2mV/Div)  
Time (100μs/Div)  
Time (250μs/Div)  
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RT9078  
PSRR vs. Frequency  
PSRR vs. Frequency  
0
-20  
-40  
-60  
-80  
0
-20  
ILOAD = 50mA  
LOAD = 30mA  
LOAD = 15mA  
I
I
-40  
ILOAD = 150mA  
ILOAD = 50mA  
LOAD = 15mA  
ILOAD = 10mA  
I
-60  
-80  
VIN = 2.8V, VOUT = 0.8V, COUT = 1μF  
1000 10000 100000 1000000  
VIN = 3.3V, VOUT = 2.8V, COUT = 1μF  
1000 10000 100000 1000000  
-100  
10  
-100  
100  
10  
100  
Frequency (Hz)  
Frequency (Hz)  
Output Noise  
Output Noise  
500  
400  
300  
200  
100  
0
500  
400  
300  
200  
100  
0
-100  
-200  
-300  
-400  
-500  
-100  
-200  
-300  
-400  
-500  
VIN = 4.5V, VOUT = 3.3V, ILOAD = 300mA,  
COUT = 1μF, Frequency = 10Hz to 100kHz  
VIN = 2.5V, VOUT = 0.8V, ILOAD = 300mA,  
OUT = 1μF, Frequency = 10Hz to 100kHz  
C
0
1
2
3
4
5
6
7
8
9
10  
0
1
2
3
4
5
6
7
8
9
10  
Sec (m)  
Sec (m)  
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DS9078-08 June 2017  
RT9078  
Application Information  
adjustable output voltage will be set to around 3.35V. Its  
temperature coefficient in Figure 4 is still perfect in such  
kind of application.  
Like any low dropout linear regulator, the RT9078’s  
external input and output capacitors must be properly  
selected for stability and performance. Use a 1μF or larger  
input capacitor and place it close to the IC's VINandGND  
pins. Any output capacitor meeting the minimum 1mΩ  
ESR (Equivalent Series Resistance) and capacitance larger  
than 1μF requirement may be used. Place the output  
capacitor close to the IC's VOUT andGNDpins. Increasing  
capacitance and decreasing ESR can improve the circuit's  
PSRR and line transient response.  
Output Voltage vs. Temperature  
3.35  
3.34  
3.33  
3.32  
3.31  
3.30  
Enable  
The RT9078 has an EN pin to turn on or turn off the  
regulator, When the EN pin is in logic high, the regulator  
will be turned on. The shutdown current is almost 0μA  
typical. The EN pin may be directly tied to VIN to keep the  
part on. The Enable input is CMOS logic and cannot be  
left floating.  
3.29  
ILOAD = 1mA  
75 100 125  
3.28  
-50  
-25  
0
25  
50  
Temperature (°C)  
Figure 4. Temperature Coefficient ofAdjustable Output  
Voltage  
Adjustable Output Voltage Setting  
The minimum recommended 50μA in the resistor divider  
makes the application no longer an ultra low quiescent  
LDO. Figure 5 is another fine adjustable output voltage  
application can keep the LDO still operating in low power  
consumption. The fine tune range is recommended to be  
less than 50mV (R1 91kΩ) in order to keep a good  
temperature coefficient of the output voltage.  
Because of the small input current at the SNS pin, the  
RT9078N with SNS pin also can work as an adjustable  
output voltage LDO. Figure 3 gives the connections for  
the adjustable output voltage application. The resistor  
divider from VOUT to SNS sets the output voltage when  
in regulation.  
The voltage on the SNS pin sets the output voltage and is  
determined by the values of R1 and R2. In order to keep  
a good temperature coefficient of output voltage, the values  
of R1 and R2 should be selected carefully to ignore the  
temperature coefficient of input current at the SNS pin. A  
current greater than 50μA in the resistor divider is  
recommended to meet the above requirement. The  
adjustable output voltage can be calculated using the  
formula given in equation 1 :  
RT9078N  
VIN  
EN  
VOUT  
SNS  
1µF  
R1  
1µF  
56pF/NC  
GND  
Figure 5. Fine Adjustable Output Voltage Application  
Circuit  
R1 + R2  
VOUT  
VSNS  
(1)  
R2  
There isn't extra current consumption in the above  
application. But the temperature coefficient of output  
voltage will be degraded by the input current at SNS pin.  
If the tuning range is larger than 50mV, a compensation  
capacitor (56pF) is required to keep the stability of output  
voltage. The fine adjustable output voltage is calculated  
using the formula given in equation 2 :  
where VSNS is determined by the output voltage selections  
in the ordering information of RT9078N. The maximum  
adjustable output voltage can be as high as input voltage  
deducted by the dropout voltage.  
When we choose 51kΩ and 16kΩ as R1 and R2  
respectively, and select a 0.8V output at SNS pin, the  
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11  
RT9078  
VOUT VSNS + ISNS R1  
(2)  
ambient temperature for fixed TJ(MAX) and thermal  
resistance, θJA. The derating curve in Figure 6 allows the  
designer to see the effect of rising ambient temperature  
on the maximum power dissipation.  
where ISNS is the input Current at SNS pin (typical 550nA  
at room temperature) and VSNS is determined by the  
output voltage selections in the ordering information of  
RT9078N.  
0.6  
Four-Layer PCB for TSOT-23-5 package  
Two-Layer Richtek EVB for ZQFN (ZDFN)-4L 1x1  
package  
0.5  
Current Limit  
The RT9078 contains an independent current limiter, which  
monitors and controls the pass transistor's gate voltage,  
limiting the output current to 0.6A (typ.). The current  
limiting level is reduced to around 0.3A named fold-back  
current limit when the output voltage is further decreased.  
The output can be shorted to ground indefinitely without  
damaging the part.  
0.4  
0.3  
ZQFN-4L 1x1 (ZDFN-4L 1x1)  
TSOT-23-5  
0.2  
0.1  
0.0  
0
25  
50  
75  
100  
125  
Thermal Considerations  
Ambient Temperature (°C)  
For continuous operation, do not exceed absolute  
maximum junction temperature. The maximum power  
dissipation depends on the thermal resistance of the IC  
package, PCB layout, rate of surrounding airflow, and  
difference between junction and ambient temperature. The  
maximum power dissipation can be calculated by the  
following formula :  
Figure 6. Derating Curve of Maximum PowerDissipation  
PD(MAX) = (TJ(MAX) TA) / θJA  
where TJ(MAX) is the maximum junction temperature, TA is  
the ambient temperature, and θJA is the junction to ambient  
thermal resistance.  
For recommended operating condition specifications the  
maximum junction temperature is 125°C and TA is the  
ambient temperature. The junction to ambient thermal  
resistance, θJA, is layout dependent. For TSOT-23-5  
package, the thermal resistance, θJA, is 230.6°C/W on a  
standard JEDEC 51-7 four-layer thermal test board. For  
ZQFN-4L 1x1 (ZDFN-4L 1x1) package, the thermal  
resistance, θJA, is 226°C/W on a two-layer Richtek  
evaluation board. The maximum power dissipation at TA =  
25°C can be calculated by the following formula :  
PD(MAX) = (125°C 25°C) / (230.6°C/W) = 0.43W for  
TSOT-23-5 package  
PD(MAX) = (125°C 25°C) / (226°C/W) = 0.44W for  
ZQFN-4L 1x1 (ZDFN-4L 1x1) package  
The maximum power dissipation depends on the operating  
Copyright 2017 Richtek Technology Corporation. All rights reserved.  
©
is a registered trademark of Richtek Technology Corporation.  
www.richtek.com  
12  
DS9078-08 June 2017  
RT9078  
Outline Dimension  
H
D
L
B
C
A
b
A1  
e
Dimensions In Millimeters  
Dimensions In Inches  
Symbol  
Min  
Max  
Min  
Max  
A
A1  
B
0.700  
0.000  
1.397  
0.300  
2.591  
2.692  
0.838  
0.080  
0.300  
1.000  
0.100  
1.803  
0.559  
3.000  
3.099  
1.041  
0.254  
0.610  
0.028  
0.000  
0.055  
0.012  
0.102  
0.106  
0.033  
0.003  
0.012  
0.039  
0.004  
0.071  
0.022  
0.118  
0.122  
0.041  
0.010  
0.024  
b
C
D
e
H
L
TSOT-23-5 Surface Mount Package  
Copyright 2017 Richtek Technology Corporation. All rights reserved.  
©
is a registered trademark of Richtek Technology Corporation.  
DS9078-08 June 2017  
www.richtek.com  
13  
RT9078  
1
2
1
2
DETAILA  
Pin #1 ID and Tie Bar Mark Options  
Note : The configuration of the Pin #1 identifier is optional,  
but must be located within the zone indicated.  
Dimensions In Millimeters  
Dimensions In Inches  
Symbol  
Min  
0.300  
0.000  
0.117  
0.175  
0.900  
0.450  
0.900  
0.450  
Max  
0.400  
0.050  
0.162  
0.275  
1.100  
0.550  
1.100  
0.550  
Min  
0.012  
0.000  
0.005  
0.007  
0.035  
0.018  
0.035  
0.018  
Max  
0.016  
0.002  
0.006  
0.011  
0.043  
0.022  
0.043  
0.022  
A
A1  
A3  
b
D
D2  
E
E2  
e
0.625  
0.025  
L
0.200  
0.300  
0.008  
0.012  
H
0.039  
0.064  
0.002  
0.003  
H1  
Z-Type 4L QFN 1x1 Package  
Richtek Technology Corporation  
14F, No. 8, Tai Yuen 1st Street, Chupei City  
Hsinchu, Taiwan, R.O.C.  
Tel: (8863)5526789  
Richtek products are sold by description only. Customers should obtain the latest relevant information and data sheets before placing orders and should verify  
that such information is current and complete. Richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek  
product. Information furnished by Richtek is believed to be accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use;  
nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent  
or patent rights of Richtek or its subsidiaries.  
www.richtek.com  
14  
DS9078-08 June 2017  
配单直通车
RT9079产品参数
型号:RT9079
Status:Active
Vin (min)(V):3.5
Vin (max)(V):36
Vout (min)(V):2.5
Vout (max)(V):12
Output Adj. Method:Fixed
Accuracy(+/- %):2
Iout (max)(mA):200
Iq (typ)(uA):50
Current Limit (typ)(mA):
Vdropout @ rated current (typ)(mV):200 @ 0.01A
Cout (min)(uF):
Cout Type:Ceramic;Tantalum
Bias Rail:
Charge Pump:
Features:Enable Input;Low Dropout;OCP
Package Type:TSOT-25
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