UCC386, UCC387, UCC388
LOW DROPOUT 200 mA LINEAR REGULATOR
SLUS377B - JULY 1999 - REVISED MAY 2000
D
Precision Positive Linear Voltage Regulator
D
0.2 V Dropout at 200 mA
D
Ensured Reverse Input/Output Voltage
D
D
D
D
D
D
D
Isolation with Low Leakage
Adjustable Output Voltage (Down to 1.25 V)
Load Independent Low Quiescent Current
(10 A typical)
Load Regulation of 5 mV from 0 mA to
200 mA
Logic Shutdown Capability
Shutdown Quiescent Current Below 2 A
Short Circuit Protection - Duty Cycle
Limiting
Remote Load Voltage Sense for Accurate
Load Regulation
SOIC
DP PACKAGES
(TOP VIEW)
VOUT
GND
GND
VSENSE
1
2
3
4
8
7
6
5
VIN
GND
GND
OFFB
TSSOP
PW PACKAGES
(TOP VIEW)
VIN
N/C
N/C
VOUT
1
2
3
4
8
7
6
5
OFFB
N/C
VSENSE
GND
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
碌A(chǔ).
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
LOAD
1
+
GND
2
+
RS1
GND
3
1.25 V
OVERCURRENT,
HICCUP CONTROL
& THERMAL
SHUTDOWN
鈥?/div>
7
8
VIN
+
GND
GND
6
VSENSE
R1
UCC386
UCC387
UCC388
1.025 m
1.875 m
0
R2
625 k
625 k
OPEN
RS2
4
R1
R2
OFFB
5
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
漏
2000, Texas Instruments Incorporated
POST OFFICE BOX 655303
Powered by ICminer.com Electronic-Library Service CopyRight 2003
鈥?/div>
DALLAS, TEXAS 75265
1
1
2
3
4
5
6
7
8
