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AS29372
Austin Semiconductor, Inc.
AS29372
Rev. 2.0 3/03
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
1
LOW-DROPOUT VOLTAGE
REGULATOR
AVAILABLE AS MILITARY
SPECIFICATIONS
!
MIL-STD-883, Class B
FEATURES
!
High output voltage accuracy
!
Guaranteed 750mA output
!
Low quiescent current
!
Low dropout voltage
!
Extremely tight load and line regulation
!
Very low temperature coefficient
!
Current and thermal limiting
!
Input can withstand -20V reverse battery and +60V
positive transients
!
Logic-controlled electronic shutdown
!
Output programmable from 1.24V to 26V
!
Available in a 7-lead flatpack package
APPLICATIONS
!
Battery powered equipment
!
Cellular telephones
!
Laptop, notebook, and palmtop computers
!
PCMCIA V
CC
and V
PP
Regulation/Switching
!
Bar code scanners
!
Automotive electronics
!
SMPS post-regulator/DC to DC modules
!
High efficiency linear power supplies
OPTIONS
MARKING
!
Package
7-Lead Flatpack
F
For more products and information
please visit our web site at
www.austinsemiconductor.com
PIN ASSIGNMENT
(Top View)
7 Lead Flatpack (F)
1
7
2
3
4
5
6
GENERAL DESCRIPTION
The AS29372 is an efficient voltage regulator with very low
dropout voltage and very low quiescent current. Key features
include protection against reversed battery, fold-back current
limiting, and automotive "load dump" protection. A logic
compatible input is provided, which allows the device to be
switched on and off.
GND
SHDN
ADJ
V
IN
V
IN
OUT
OUT
V
V
V
V
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AS29372
Austin Semiconductor, Inc.
AS29372
Rev. 2.0 3/03
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
2
*Across the full operating temperature, the minimum input
voltage range for full output current is 4.3V to 26V. Output
will remain in-regulation at lower output voltages and low
current loads down to an input of 2V at 25C.
ABSOLUTE MAXIMUM RATINGS
1
Power Dissipation............................................Internally Limited
Lead Temperature (Soldering, 5 seconds)..........................260C
Storage Temperature Range..............................-65C to +150C
Operating Junction Temperature Range...........-40C to +125C
JC
= 14C/W
Input Supply Voltage................................................-20V to +60V
Operating Input Supply Voltage*...................................2V to 26V
Adjust Input Voltage
9,10
...........................................-1.5V to +26V
Shutdown Input Voltage...........................................-0.3V to +30V
Error Comparator Output Voltage.........................-0.3V to +30V
ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for T
J
= 25C and limits in boldface apply over the full operating temperature range,
-40C to +125C. Unless otherwise specified, V
IN
= V
OUT
+ 1V, I
L
= 5mA, C
L
= 10F. The AS29372 are programmed for a
5V output voltage, and V
SHUTDOWN
< 0.6V.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
O
/
T
Output Voltage
Temperature Coef.
(note 2)
20
100
ppm/C
V
O
/
V
IN
Line Regulation
V
IN
= V
OUT
+ 1V to 26V
I
L
= 2mA
0.03
0.10
0.40
%
V
O
/
I
L
Load Regulation
I
L
= 5 to 700 mA
(note 3 & 4)
0.04
0.16
0.20
%
I
L
= 5mA
80
150
180
I
L
= 100mA
200
250
320
I
L
= 500mA
300
450
600
I
L
= 5mA, V
O
= 5 0.1V
160
250
300
A
I
L
= 100mA, V
O
= 5 0.1V
1
2.5
3
I
L
= 500mA, V
O
= 5 0.1V
8
13
16
V
O
/
P
D
Thermal Regulation (note 9)
0.05
0.2
%/W
Reference Voltage
(note 7)
1.204
1.26
V
Adjust Pin
Bias Current
20
40
60
nA
mV
Dropout Voltage
(note 5)
V
IN
- V
O
mA
I
GND
Ground Pin Current
(note 6)
V
V
V
V
Volta
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AS29372
Austin Semiconductor, Inc.
AS29372
Rev. 2.0 3/03
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
3
ELECTRICAL CHARACTERISTICS (Cont.)
Shutdown Input
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Low (ON)
0.7
High (OFF)
2.0
VSHUTDOWN = 2.4V
30
50
100
VSHUTDOWN = 26V
450
600
750
Regulator Output
Current in
Shutdown
(note 8)
3
10
20
A
Input Logic Voltage
V
Shutdown Pin
Input Current
A
NOTES:
1. Unless otherwise specified, V
IN
= V
OUT
= 1V, I
L
= 5mA, C
L
= 10F, T
J
= T
A
. Device shall be biased in accordance with
Figure 1 with V
SHUTDOWN
< 0.6V, V
IN
= 6V, R
L
= 300 kilohms 1%.
2. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature
range.
3. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage
due to heating effects are covered by the thermal regulation specification.
4. This parameter is tested up to 600mA; however, limits are guaranteed but not tested to 750mA.
5. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 100mV below its
nominal value measured at 1V differential. At very low values of programmed output voltage, the minium input supply
voltage of 2V (2.3V over temperature) must be taken into account.
6. Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load
current plus the ground pin current.
7. V
REF
< V
OUT
< (V
IN
- 1V), 4.3V < V
IN
< 26V, 5mA < I
L
< 600mA, T
J
< T
JMAX
.
8. See Figure 1 with R
L
> 150 kilohms, V
SHUTDOWN
> 2V, V
IN
< 26V, V
OUT
= 0.
9. Thermal regulation is defined as the change in output voltage at a time (t) after a change in power dissipation is applied,
excluding line and load regulation effects. Specification is for a 200mA load pulse at V
IN
= 20V (at 4W pulse) for
t = 10ms.
V
V
V
V
Volta
olta
olta
olta
oltaggggge R
e R
e R
e R
e Reeeeegula
gula
gula
gula
gulator
tor
tor
tor
tor
AS29372
Austin Semiconductor, Inc.
AS29372
Rev. 2.0 3/03
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
4
SCHEMATIC DIAGRAM
V
V
V
V
Volta
olta
olta
olta
oltaggggge R
e R
e R
e R
e Reeeeegula
gula
gula
gula
gulator
tor
tor
tor
tor
AS29372
Austin Semiconductor, Inc.
AS29372
Rev. 2.0 3/03
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
5
TYPICAL CHARACTERISTICS
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