MAX1694EUB原理图各脚功能电路原理芯片引脚定义引脚图及功能-中国IC网-芯三七

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产品型号MAX1694EUB的概述

MAX1694EUB芯片概述 MAX1694EUB是Maxim Integrated公司生产的一款高效直流-直流（DC-DC）转换器，旨在满足对电源管理系统日益增长的需求。该芯片特别设计用于便携式电子设备，能够在宽电压范围内稳定输出。作为一种高效的降压转换器，MAX1694EUB具有多种保护功能和灵活的应用前景，使其成为电源设计工程师的重要工具。 MAX1694EUB支持宽输入电压范围，通常适用于2.5V到5.5V的直流电源，能够输出高达1.5A的持续电流。它内置的高频开关频率使得其在物理空间上占据较少位置，同时也提高了其效率，使得发热量更小。芯片的设计还考虑了其在低功耗设备中的应用，最低的待机电流有助于延长电池的使用时间。 MAX1694EUB的详细参数在评估MAX1694EUB的性能时，几个关键参数需要关注： 1. 输入电压范围：2.5V至5.5V 2. 输出电压范围：固定输出电...

产品型号MAX1694EUB的Datasheet PDF文件预览

19-1518; Rev 0; 9/99

USB Current-Limited Switches

with Fault Blanking

3/MAX1694

General Description

Features

The MAX1693/MAX1694 are current-limited, 60mΩ

switches with built-in fault blanking. Their accurate pre-

set current limit of 0.7A to 1.0A makes them ideally suit-

ed for USB applications. Their low quiescent supply

current (14µA) and shutdown current (1µA) conserve

battery power in portable applications. The MAX1693/

MAX1694 operate with inputs from +2.7V to +5.5V,

making them ideal for both +3V and +5V systems.

♦ Accurate Current Limit (0.7A min, 1.0A max)

♦ Guaranteed 0.75A Short-Circuit Protection

♦ 10ms Internal Fault-Blanking Timeout

♦ No Fault Signal During Power-Up

♦ Latched FAULT Output Turns Off Power Switch

(MAX1694)

A fault signal notifies the microprocessor that the inter-

nal current limit has been reached. A 10ms fault-blank-

ing feature allows momentary faults (such as those

caused when hot-swapping into a capacitive load) to

be ignored, thus preventing false alarms to the host

system. This fault blanking also prevents a fault signal

from being issued when the device is powering up.

♦ Thermal Shutdown Protection

♦ +2.7V to +5.5V Supply Range

♦ 14µA Supply Current

♦ Small 10-Pin µMAX Package

♦ UL Recognition Pending

In the MAX1693, an output overcurrent condition caus-

es the switch to current limit at 0.7A to 1.0A and FAULT

to go low after the 10ms blanking period. When the

overcurrent condition is removed, FAULT returns to its

high-impedance state. In the MAX1694, any overcur-

rent longer than 10ms will latch the switch open and set

FAULT low. The latch is cleared by cycling the ON

input or by powering up the device again. This feature

saves power by preventing the device from thermally

cycling on and off in case of a persistent short-circuit

condition.

Applications

USB Ports and Hubs

Notebook Computers

Portable Equipment

Docking Stations

Hot Plug-In Power Supplies

Battery-Charger Circuits

The MAX1693/MAX1694 have several safety features to

ensure that the USB port is protected. Built-in thermal-

overload protection limits power dissipation and junc-

tion temperatures. Both devices have accurate internal

current-limiting circuitry to protect the input supply

against overload. They are available in space-saving

10-pin µMAX packages.

Ordering Information

PART

TEMP. RANGE

-40°C to +85°C

PIN-PACKAGE

10 µMAX

MAX1693EUB

MAX1694EUB

10 µMAX

Typical Operating Circuit

Pin Configuration

INPUT

+2.7V TO +5.5V

OUT

OUTPUT

TOP VIEW

MAX1693

MAX1694

OUT

10 OUT

MAX1693

MAX1694

FAULT

OUT

FAULT

GND

OUT

OFF

GND

µMAX

________________________________________________________________ Maxim Integrated Products

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

USB Current-Limited Switches

with Fault Blanking

ABSOLUTE MAXIMUM RATINGS

Operating Temperature Range

IN, ON, FAULT to GND.............................................-0.3V to +6V

MAX1693EUB/MAX1694EUB ..........................-40°C to +85°C

Storage Temperature Range.............................-65°C to +150°C

Lead Temperature (soldering, 10sec) .............................+300°C

OUT to GND ................................................-0.3V to (V + 0.3V)

Maximum Continuous Switch Current .....1.2A (internally limited)

OUT Short Circuit to GND ..........................................Continuous

Continuous Power Dissipation (T = +70°C)

10-Pin µMAX (derate 5.6mW/°C above +70°C)............444mW

Stresses beyond those listed under “Absolute Maximum Ratings” may 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 for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(V = +5V, T = 0°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

5.5

UNITS

Operating Voltage

2.7

Timer not running

Timer running

Quiescent Current

= GND, I

= 0

µA

OUT

3/MAX1694

Off-Supply Current

= V = V

= 5.5V

0.001

µA

OUT

Undervoltage Lockout

UVLO

Rising edge, 100mV hysteresis

2.0

2.6

= V ,

= +25°C

0.01

Off-Switch Leakage

= 5.5V,

µA

OUT

= 0°C to +85°C

= GND

= +25°C

= 4.4V to 5.5V

= 3V

125

150

1000

On-Resistance

Current Limit

mΩ

= 0°C to +85°C

(Note 1)

700

850

LIMIT

Continuous Short-Circuit

Current Limit

OUT shorted to GND, MAX1693 only (Note 2)

500

700

0.8

= 2.7V to 5.5V

= 2.7V to 3.6V

= 3.7V to 5.5V

= V or GND

ON Input Logic Low Voltage

ON Input Logic High Voltage

ON Input Leakage

2.4

µA

FAULT Output Logic Low

Voltage

= 1mA, V = 3V

0.4

SINK

FAULT Output High Leakage

Current

= V

= 5.5V

FAULT

µA

Fault-Blanking Timeout Period

From overcurrent condition to FAULT assertion

= 5V, C = 150µF, R = 15Ω,

OUT

Start-Up Time

from ON driven low to 50% full V

OUT

Switch Turn-On Time

= 400mA

200

µs

°C

LOAD

Switch Turn-Off Time

OFF

LOAD

Thermal Shutdown Threshold

165

_______________________________________________________________________________________

USB Current-Limited Switches

with Fault Blanking

3/MAX1694

ELECTRICAL CHARACTERISTICS

(V = +5V, T = -40°C to +85°C, unless otherwise noted.) (Note 3)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

5.5

UNITS

Operating Voltage

Quiescent Current

Off-Supply Current

Undervoltage Lockout

µA

= GND, I

= 0, timer not running

OUT

= V = V

= 5.5V

OUT

UVLO

Rising edge, 100mV hysteresis

2.0

2.9

Off-Switch Leakage

= V = 5.5V, V = GND

OUT

µA

= 4.4V to 5.5V

= 3V

125

150

On-Resistance

Current Limit

mΩ

(Note 1)

640

1060

LIMIT

Continuous Short-Circuit

Current Limit

OUT shorted to GND, MAX1693 only (Note 2)

750

0.8

= 3V to 5.5V

= 3V to 3.6V

= 3.7V to 5.5V

= V or GND

ON Input Logic Low Voltage

ON Input Logic High Voltage

ON Input Leakage

2.4

µA

FAULT Output Logic Low

Voltage

= 1mA, V = 3V

0.4

SINK

FAULT Output High Leakage

Current

= V

= 5.5V

FAULT

µA

Fault-Blanking Timeout Period

Switch Turn-On Time

200

µs

From overcurrent condition to FAULT assertion

= 400mA

LOAD

Switch Turn-Off Time

OFF

Note 1: MAX1693’s current limit is tested by forcing V

to 4.5V. The MAX1694’s current limit is tested by increasing the output cur-

OUT

rent until the switch is latched off.

Note 2: This specification applies to the MAX1693 only. The MAX1694 latches the switch off under a sustained (>10ms) short-

circuit condition.

Note 3: Specifications to -40°C are guaranteed by design, not production tested.

_______________________________________________________________________________________

USB Current-Limited Switches

with Fault Blanking

Typical Operating Characteristics

(V = +5V, T = +25°C, unless otherwise noted.)

OFF-SUPPLY CURRENT

vs. TEMPERATURE

QUIESCENT CURRENT vs. INPUT VOLTAGE

QUIESCENT CURRENT vs. TEMPERATURE

100

= GND

= O

V = 5V

= V

OUT

= 3V

0.1

0.01

-40 -20

80 100

-40 -20

80 100

3/MAX1694

TEMPERATURE (°C)

INPUT VOLTAGE (V)

TEMPERATURE (°C)

NORMALIZED ON-RESISTANCE

vs. TEMPERATURE

NORMALIZED OUTPUT CURRENT

vs. OUTPUT VOLTAGE

OFF-SWITCH CURRENT vs. TEMPERATURE

1000

100

1.4

1.2

1.0

0.8

0.6

0.4

0.2

1.2

= V

= 425mA

OUT

LIMIT

1.0

0.8

0.6

0.4

0.2

SHORT-CIRCUIT CURRENT

0.1

0.01

-40 -20

80 100

-40 -20

80 100

TEMPERATURE (°C)

OUTPUT VOLTAGE (V)

FAULT-BLANKING TIMEOUT

vs. TEMPERATURE

TURN-ON TIME vs. TEMPERATURE

TURN-OFF TIME vs. TEMPERATURE

160

140

120

100

= 425mA

LOAD

= 425mA

LOAD

= 5V

= 3V

= 5V

= 850mA

= 3V OR 5V

OUT

-40 -20

80 100

-40 -20

80 100

-40 -20

80 100

TEMPERATURE (°C)

_______________________________________________________________________________________

USB Current-Limited Switches

with Fault Blanking

3/MAX1694

Typical Operating Characteristics (continued)

(V = +5V, T = +25°C, unless otherwise noted.)

MAX1693

CURRENT-LIMIT RESPONSE

CURRENT-LIMIT AND FAULT RESPONSE

2ms/div

10µs/div

CH1 = V , 200mV/div, AC-COUPLED; CH2 = V

OUT

CH1 = V , 200mV/div, AC-COUPLED; CH2 = V

OUT

5V/div; CH3 = V

, 5V/div; CH4 = I , 500mA/div

FAULT

OUT

5V/div; CH3 = V

, 5V/div; CH4 = I , 1A/div

FAULT

OUT

MAX1693

SWITCH TURN-OFF TIME

SWITCH TURN-ON TIME

1µs/div

20µs/div

CH1 = V , 5V/div; CH2 = V , 5V/div;

OUT

CH3 = V

OUT

CH3 = V

, 5V/div; CH4 = I , 200mA/div

FAULT

OUT

FAULT

OUT

MAX1694

OVERCURRENT TO FAULT

MAX1693

START-UP TIME

AND SWITCH LATCHED OFF

(TYPICAL USB APPLICATION)

C = 150µF

R = 15Ω

FULL-CURRENT LIMIT CHARGES CAPACITOR

RESISTOR

LOAD

CURRENT

FOLDBACK-

CURRENT LIMIT

2ms/div

1ms/div

CH1 = V

, 5V/div; CH2 = I , 5V/div;

OUT

CH1 = V , 5V/div; CH2 = V , 5V/div;

FAULT

CH3 = I , 1A/div

OUT

CH3 = I , 500mA/div; CH4 = V

, 5V/div

OUT

FAULT

_______________________________________________________________________________________

USB Current-Limited Switches

with Fault Blanking

Pin Description

NAME

FUNCTION

Input. P-channel MOSFET source. Connect all IN pins together and bypass with a 1µF

ceramic capacitor to ground.

1, 3, 9

Switch Output. P-channel MOSFET drain. Connect all OUT pins together and bypass with a

0.1µF capacitor to ground.

2, 4, 8, 10

OUT

Active-Low Switch On Input. A logic low turns the switch on.

Ground

GND

Fault-Indicator Output. This open-drain output goes low when the device is in thermal shut-

down or undervoltage lockout or on a sustained (>10ms) current-limit condition. For the

MAX1694 only, this output latches low when asserted, and the power switch is turned off

until the latch is reset.

FAULT

These switches are not bidirectional; therefore, the

input voltage must be higher than the output voltage.

3/MAX1694

OUT

Continuous Short-Circuit Protection

MAX1693

The MAX1693/MAX1694 are foldback short circuit-pro-

tected switches. In the event of an output short-circuit

or current-overload condition, the current through the

switch is foldback-current limited to 500mA continuous

for the MAX1693. For the MAX1694, if the short circuit

lasts longer than 10ms, the switch is latched off.

FAULT

REPLICA

AMPLIFIER

Thermal Shutdown

The MAX1693/MAX1694 feature thermal shutdown. The

switch turns off and the FAULT output goes low imme-

diately (no fault blanking) when the junction tempera-

ture exceeds +165°C. The MAX1694 remains latched

with the switch off and the FAULT output low. When the

MAX1693 cools 20°C, the switch turns back on. If the

fault short-circuit condition is not removed, the switch

will cycle on and off, resulting in a pulsed output.

CURRENT-LIMIT

AMPLIFIER

1.24V

10ms

TIMER

HOT

GND

FAULT Indicator

The MAX1693/MAX1694 provide a fault output

(FAULT). A 100kΩ pull-up resistor from FAULT to IN

provides a logic control signal. This open-drain output

goes low when any of the following conditions occur:

CONTROL

CIRCUITRY

Figure 1. MAX1693 Functional Diagram

•

The input voltage is below the undervoltage-lockout

(UVLO) threshold.

_______________Detailed Description

The die temperature exceeds the thermal shutdown

temperature limit of +165°C.

The MAX1693/MAX1694 P-channel MOSFET power

switches limit output current to 0.7A min to 1.0A max.

When the output current is increased beyond the cur-

The device is in current limit and the 10ms fault-

blanking period is exceeded.

rent limit (I

replica switch (I

), the current also increases through the

LIMIT

Fault Blanking

The MAX1693/MAX1694 feature 10ms fault blanking.

Fault blanking allows current-limit faults, including

/6500). The current-limit error ampli-

OUT

fier compares the voltage to the internal 1.24V refer-

ence and regulates the current back to the I

LIMIT

_______________________________________________________________________________________

USB Current-Limited Switches

with Fault Blanking

3/MAX1694

momentary short-circuit faults that occur when hot-

Layout and Thermal Dissipation

To optimize the switch-response time to output short-

circuit conditions, it is very important to keep all traces

as short as possible to reduce the effect of undesirable

parasitic inductance. Place input and output capacitors

as close to the device as possible (no more than 5mm).

All IN and all OUT pins must be connected with short

traces to the power bus. Wide power bus planes will

provide superior heat dissipation through the switch IN

and OUT pins. Figure 3 shows suggested pin connec-

tions for a single-layer board.

swapping a capacitive load, and also ensures that no

fault is issued during power-up. When a load transient

causes the device to enter current limit, an internal

counter starts. If the load fault persists beyond the

10ms fault-blanking timeout, the FAULT output asserts

low. Ensure that the MAX1693/MAX1694’s input is ade-

quately bypassed to prevent input glitches from trigger-

ing spurious FAULT outputs. Input voltage glitches less

than 150mV will not cause a spurious FAULT output.

Load-transient faults less than 10ms (typ) will not cause

a FAULT output assertion.

Under normal operating conditions, the package can

dissipate and channel heat away. Calculate the maxi-

mum power dissipation as follows:

Only current-limit faults are blanked. Die overtempera-

ture faults and input voltage droops below the UVLO

threshold will cause an immediate fault output.

2 _{· R}

P = (I

)

LIMIT

Fault Latching (MAX1694 Only)

The MAX1694 features a latched FAULT output.

Whenever the FAULT output is activated, it latches the

FAULT output low and also turns the switch off. To clear

the latch, either cycle the ON input or cycle the input

voltage below UVLO.

where I

is the preset current limit (1.0A max) and

LIMIT

is the on-resistance of the switch (125mΩ max).

When the output is short-circuited, foldback-current lim-

iting activates and the voltage drop across the switch

equals the input supply. The power dissipated across

the switch increases, as does the die temperature. If the

fault condition is not removed, the thermal-overload-pro-

tection circuitry activates (see the Thermal Shutdown

section). Wide power-bus planes connected to IN and

OUT and a ground plane in contact with the device will

help dissipate additional heat.

Applications Information

Input Capacitor

To limit the input voltage drop during momentary output

short-circuit conditions, connect a capacitor from IN to

GND. A 1µF ceramic capacitor will be adequate for most

applications; however, higher capacitor values will fur-

ther reduce the voltage drop at the input. See Figure 2.

Chip Information

Output Capacitor

Connect a 0.1µF capacitor from OUT to GND. This cap-

acitor helps prevent inductive parasitics from pulling

OUT negative during turn-off.

TRANSISTOR COUNT: 715

INPUT

+2.7V TO +5.5V

OUT

OUTPUT

0.1µF*

MAX1693

MAX1694

1µF

MAX1693

MAX1694

100k

OUT

FAULT

OUT

OFF

OUT

GND

OUT

FAULT

GND

*USB SPECIFICATIONS REQUIRE A LARGER CAPACITOR

Figure 3. IN and OUT Cross Connections for a Single-Layer

Board

Figure 2. Typical Application Circuit

_______________________________________________________________________________________

USB Current-Limited Switches

with Fault Blanking

Package Information

3/MAX1694

Note: Neither the MAX1693 nor MAX1694 has an exposed pad.

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

Printed USA

is a registered trademark of Maxim Integrated Products.

MAX1694EUB相关文章

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MAX1694EUB产品参数

型号:	MAX1694EUB
是否无铅：	含铅
生命周期：	Active
零件包装代码：	SOIC
包装说明：	MICRO MAX PACKAGE-10
针数：	10
Reach Compliance Code：	unknown
风险等级：	5.16
可调阈值：	NO
模拟集成电路 - 其他类型：	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 代码：	S-PDSO-G10
JESD-609代码：	e0
长度：	3 mm
湿度敏感等级：	1
信道数量：	1
功能数量：	1
端子数量：	10
最高工作温度：	85 °C
最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP
封装形状：	SQUARE
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	245
认证状态：	COMMERCIAL
座面最大高度：	1.1 mm
最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	2.7 V
标称供电电压 (Vsup)：	5 V
表面贴装：	YES
温度等级：	INDUSTRIAL
端子面层：	TIN LEAD
端子形式：	GULL WING
端子节距：	0.5 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3 mm
Base Number Matches：	1

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产品型号MAX1694EUB的概述

产品型号MAX1694EUB的Datasheet PDF文件预览

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