U
C
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C
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3
A
8
6
,
U
C
A
C
R
3
8
7
, U CC 38 8
R EG U LATO R
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SLUS377B - JULY 1999 - REVISED MAY 2000
SOIC
DP PACKAGES
(TOP VIEW)
D
Precision Positive Linear Voltage Regulator
0.2 V Dropout at 200 mA
D
D
Ensured Reverse Input/Output Voltage
Isolation with Low Leakage
VOUT
GND
GND
VIN
1
2
3
4
8
7
6
5
GND
GND
OFFB
D
Adjustable Output Voltage (Down to 1.25 V)
D
Load Independent Low Quiescent Current
(10 A typical)
VSENSE
D
D
D
D
Load Regulation of 5 mV from 0 mA to
200 mA
TSSOP
PW PACKAGES
(TOP VIEW)
Logic Shutdown Capability
Shutdown Quiescent Current Below 2 A
VIN
N/C
OFFB
N/C
1
2
3
4
8
7
6
5
Short Circuit Protection - Duty Cycle
Limiting
N/C
VSENSE
GND
VOUT
D
Remote Load Voltage Sense for Accurate
Load Regulation
description
The UCC386/7/8 positive linear pass regulator series is tailored for low-dropout applications where extremely
low quiescent power is required. Fabricated with BiCMOS technology ideally suited for low input to output
differential applications, the UCC386/7/8 will pass 200 mA while requiring only 200 mV of input voltage
headroom. Quiescent current is typically less than 10 µA. To prevent reverse current conduction, on-chip
circuitry limits the minimum forward voltage to 50 mV typical. Once the forward voltage limit is reached, the
input-output differential voltage is maintained as the input voltage drops until undervoltage lockout disables the
regulator.
block diagram and application circuit
SWITCH CONTROL
VOUT
VIN
LOAD
1
8
7
6
5
+
+
–
GND
GND
GND
GND
OFFB
2
3
+
1.25 V
RS1
RS2
OVERCURRENT,
HICCUP CONTROL
& THERMAL
SHUTDOWN
R1
R2
VSENSE
R1
R2
4
UCC386 1.025 m
UCC387 1.875 m
625 k
625 k
OPEN
UCC388
0
UCC388 ONLY
FROM OPEN DRAIN
SHUTDOWN COMMAND
UDG-98087
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2000, Texas Instruments Incorporated
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