National Semiconductor LP3992 Technical data
LP3992
Micropower 1.5V CMOS Voltage Regulator with
Shutdown Control
LP3992 Micropower 1.5V CMOS Voltage Regulator with Shutdown Control
December 2002
General Description
The LP3992 regulator is designed to meet the requirements
of portable, battery-powered systems providing an accurate
output voltage, low noise, and low quiescent current. Battery
life will be prolonged by the ability of the LP3992 to provide
a 1.5V output from the low input voltage of 1.9V. Additionally,
when switched to a shutdown mode via a logic signal at the
shutdown pin, the power consumption is reduced to virtually
zero. The LP3992 also features short-circuit and thermalshutdown protection.
The LP3992 is designed to be stable with space saving
ceramic capacitors as small as 1.0µF.
The device is available in an SOT23-5 package. Performance is specified for a -40˚C to 125˚C temperature range.
For output voltages other than 1.5V and alternative package
options, please contact your local NSC sales office.
Typical Application Circuit
Key Specifications
n 1.9 to 5.2V input range
n Accurate 1.5V
n Less than 1.5µA quiescent current in shutdown
n Stable with a 1µF output capacitor
n Guaranteed 30mA output current
n Low output voltage Noise; 300µV
±
0.09V output voltage
RMS
Features
n Operation from a low input voltage; 1.9V
n Low quiescent current; 29µA typical
n Stable with a ceramic capacitor
n Logic controlled shutdown
n Fast turn ON and OFF
n Thermal-overload and short circuit protection
n 5 pin package, SOT23
n -40˚C to +125˚C junction temperature range
20041201
© 2002 National Semiconductor Corporation DS200412 www.national.com
Pin Descriptions
LP3992
Pin No Symbol Name and Function
1V
2 GND Common Ground
3 SD Shutdown input; Disables the regulator when ≤ 0.4V.
4C
5V
Connection Diagram
OUT
OUT
IN
Voltage Supply Input
Enables the regulator when ≥ 1.15V.
Output capacitor connection. Internally Connected to V
OUT
connection. This is the recommended device connection for the
1.0µF output capacitor to guarantee a stable output.
Voltage output. Connect this output to the load circuit.
SOT23 - 5 Package (MF)
20041202
Top View
See NS package number MF05A
Ordering Information
Output
Voltage (V)
Grade
1.5 STD LP3992IMF-1.5 LP3992IMFX-1.5
1.5 STD LP3992IMF-1.5/E4000193 LP3992IMFX-1.5/S4000170
LP3992 Supplied as 1000
Units, Tape and Reel
LP3992 Supplied as 3000
Units, Tape and Reel
Package Marking
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LP3992
Absolute Maximum Ratings
(Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage -0.3 to 6.5V
Output Voltage -0.3 to (V
+ 0.3V) to
IN
Thermal Resistance (Note 4)
θ
JA
220˚C/W
Maximum Power Dissipation
at 25˚C 568mW
ESD (Note 5)
Human Body Model 2KV
Machine Model 200V
6.5V (max)
Shutdown Input Voltage -0.3 to 6.5V
Junction Temperature 150˚C
Lead Temp. (Note 3) 260˚C
Storage Temperature -65 to 150˚C
Operating Conditions(Note 1)
Input Voltage 1.9 to 5.2V
Shutdown Input Voltage 0 to 6.0V
Junction Temperature -40˚C to 125˚C
Power Dissipation at 25˚C 454mW
Electrical Characteristics
Unless otherwise noted, VSD= 1.15, VIN=V
pearing in normal type apply for T
= 25˚C. Limits appearing in boldface type apply over the full temperature range for opera-
J
tion, −40 to +125˚C. (Note 13)
Symbol Parameter Conditions Typ
V
∆V
IN
OUT
Input Voltage 1.9 5.2 V
Output Voltage Tolerance Over full line and load regulation. -90 +90 mV
Line Regulation Error V
Load Regulation Error I
I
LOAD
I
Q
I
SC
Load Current (Notes 6, 7) 0 µA
Quiescent Current VSD= 1.15V, I
Short Circuit Current Limit (Note 12) 90 mA
PSRR Power Supply Rejection Ratio f = 1kHz, I
E
EN
T
SHUTDOWN
Output noise Voltage (Note 7) BW = 10Hz to 1000kHz,
Thermal Shutdown Temperature 160
Thermal Shutdown Hysteresis 20
Enable Control Characteristics
I
SD
Maximum Input Current at
SD Input
V
IL
V
IH
Low Input Threshold VIN= 1.8V to 5.2V 0.4 V
High Input Threshold VIN= 1.8 to 5.2V 1.15 V
Timing Characteristics
T
ON1
T
ON2
T
OFF1
T
OFF2
Transient
Response
Note 1: Absolute Maximum Ratings are limits beyond which damage can occur. Operating Ratings are conditions under which operation of the device is
guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical
Characteristics tables.
Note 2: All Voltages are with respect to the potential at the GND pin.
Turn On Time (Note 7) 50 to 85% of V
Turn Off Time (Note 7) 85 to 50% of V
Line Transient Response |δV
OUT|Trise=Tfall
Load Transient Response
|
|δV
OUT
+ 1.0V, CIN= 1 µF, I
OUT
OUT
= 1 mA, C
= 1 µF. Typical values and limits ap-
OUT
Limit
Min Max
=(V
IN
OUT(NOM)
= 1mA
I
OUT
= 1mA to 30mA 100 220 µV/mA
OUT
= 1.15V, I
SD
V
= 0.4V 0.003 1.5
SD
f = 20kHz, I
= 4.2V
V
IN
VEN= 0.0V and VIN= 5.2V
+ 1.0V) to 5.2V,
= 0mA 26 50
OUT
= 30mA 29 50
OUT
= 30mA 40
OUT
= 30mA 30
OUT
OUT(NOM)
(Note 8) 15
-0.27 +0.27 %/V
300 µV
0.001 µA
To 95% Level (Note 9) 40
OUT(NOM)
(Note 10) 15
95 to 5% Level (Note 11) 40
= 10µS (Note 7) 60
T
rise=Tfall
I
OUT
= 1µS
= 100µA to 5mA(Note 7)
60
Units
µAV
dB
RMS
˚C
µS
µS
mV
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