UC1835 UC1836
UC2835 UC2836
UC3835 UC3836
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, specifications hold for T
A
= 0°C to + 70°C for the
UC3835/6, –25°C to + 85°C for the UC2835/6, and –55°C to +125°C for the
UC1835/6, +V
IN
= 6V, Driver Source= 0V, Driver Sink = 5V, T
A
= T
J
.
PARAMETER
TEST CONDITIONS
MIN. TYP.
Regulating Voltage and Error Amplifier
(UC1836 Family Only)
Driver Current = 10mA, T
J
= 25°C
2.47
2.5
Regulating Level at V
OUT
Sense (V
REG
)
Over Temperature
2.45
6.0
Line Regulation
+V
IN
= 5.2V to 35V
Load Regulation
Driver Current = 0 to 250mA
3.0
V
OUT
Sense =2.5V
-1.0
-0.2
Bias Current at V
OUT
Sense
Error Amp Transconductance
±100µA
at Compensation/Shutdown Pin
0.8
1.3
Maximum Compensation Output Current
Sink or Source, Driver Source Open
90
200
Driver
Maximum Current
250
500
Saturation Voltage
Driver Current = 250mA, Driver Sink
2.0
Pull-Up Current at Driver Sink
Compensation/Shutdown=0.45V
140
250
Driver Sink Leakage
In UVLO
In Reverse Voltage (UC1835 Family Only)
Thermal Shutdown
165
Foldback Current Limit
2.2
2.5
Current Limit Levels at Sense Resistor Out
V
OUT
Sense = (0.99) V
REG
V
OUT
Sense = (0.5) V
REG
1.3
1.5
0.25
0.4
V
OUT
Sense = 0V
12
24
Current Limit Amp Tansconductance
±100µA
at Compensation/Shutdown,
V
OUT
Sense = (0.9) V
REG
Limiting Voltage at Current Limit (-)
V
OUT
Sense = (0.9) V
REG
80
100
(Note 2)
Volts Below +V
IN
, T
J
= 25°C
Sense Resistor Value (Note 3)
V
OUT
Sense = (0.9) V
REG,
40
I
OUT
= I
A
, T
J
= 25°C
Note 2: This voltage has a positive temperature coefficient of approximately 3500ppm/°C.
Note 3: This resistance has a positive temperature coefficient of approximately 3500ppm/°C.
The total resistance from Pin 1 to Pin 8 will include an additional 60 to 100m
Ω
of package resistance.
MAX. UNITS
2.53
2.55
20
15
2.0
260
V
V
mV
mV
µA
mS
µA
mA
V
µA
µA
µA
°C
A
A
A
mS
mV
mΩ
2.8
300
10
10
2.8
1.7
0.55
42
140
APPLICATION AND OPERATION INFORMATION
UC 1835
−
Typical configurations for a 2A,
Low Dropout 5V Regulator
UC1836
−
Typical Configuration for a 2A,
Low Dropout Adjustable Regulator
Note 4: Suggested Pass devices are TIP 32B. (Dropout Voltage
≤
0.75V) or, D45H, (Dropout Voltage
≤
0.5V), or equivalents.
3
TI [ TEXAS INSTRUMENTS ]
