oltag Re gulator
Volta g e Re gulator
Austin Semiconductor, Inc.
LOW-DROPOUT VOLTAGE
REGULATOR
AVAILABLE AS MILITARY
SPECIFICATIONS
MIL-STD-883, Class B para 1.2.2 compliant
AS29372
PIN ASSIGNMENT
(Top View)
7 Lead Flatpack (F)
GND
1
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
SHDN 2
ADJ 3
V
IN
4
V
IN
5
7 OUT
6
OUT
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
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.
OPTIONS
Package
7-Lead Flatpack
MARKING
F
For more products and information
please visit our web site at
www.austinsemiconductor.com
AS29372
Rev. 2.6 06/05
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
1
oltag Re gulator
Volta g e Re gulator
Austin Semiconductor, Inc.
ABSOLUTE MAXIMUM RATINGS
1
Power Dissipation............................................Internally Limited
Lead Temperature (Soldering, 5 seconds)..........................260°C
Storage Temperature Range..............................-65°C to +150°C
Operating Junction Temperature Range...........-40°C to +125°C
θ
JC
= 14°C/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
*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 25°C.
AS29372
ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for T
J
= 25°C and limits in boldface apply over the full operating temperature range,
-40°C to +125°C. Unless otherwise specified, V
IN
= V
OUT
+ 1V, I
L
= 5mA, C
L
= 10µF. The AS29372 are programmed for a
5V output voltage, and V
SHUTDOWN
< 0.6V.
SYMBOL
∆V
O
/∆T
PARAMETER
Output Voltage
(note 2)
Temperature Coef.
I
L
= 2mA
CONDITIONS
MIN
TYP
20
0.03
MAX
100
0.10
0.40
0.16
0.20
150
180
250
320
450
600
250
300
2.5
3
13
16
0.2
1.26
40
60
UNITS
ppm/°C
%
∆V
O
/∆V
IN
Line Regulation
∆V
O
/∆I
L
Load Regulation
V
IN
= V
OUT
+ 1V to 26V
I
L
= 5 to 700 mA
(note 3 & 4)
I
L
= 5mA
0.04
80
200
300
160
1
8
0.05
1.204
20
%
V
IN
- V
O
Dropout Voltage
(note 5)
I
L
= 100mA
I
L
= 500mA
I
L
= 5mA, V
O
= 5 ± 0.1V
mV
µA
I
GND
Ground Pin Current
I
L
= 100mA, V
O
= 5 ± 0.1V
(note 6)
I
L
= 500mA, V
O
= 5 ± 0.1V
mA
%/W
V
nA
∆V
O
/∆P
D
Thermal Regulation (note 9)
Reference Voltage (note 7)
Adjust Pin
Bias Current
AS29372
Rev. 2.6 06/05
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
2
oltag Re gulator
Volta g e Re gulator
Austin Semiconductor, Inc.
ELECTRICAL CHARACTERISTICS (Cont.)
Shutdown Input
PARAMETER
Input Logic Voltage
Shutdown Pin
Input Current
Low (ON)
High (OFF)
VSHUTDOWN = 2.4V
VSHUTDOWN = 26V
CONDITIONS
MIN
2.0
30
450
3
50
100
600
750
10
20
TYP
MAX
0.7
UNITS
V
AS29372
µA
Regulator Output
(note 8)
Current in
Shutdown
µA
NOTES:
1. Unless otherwise specified, V
IN
= V
OUT
= 1V, I
L
= 5mA, C
L
= 10µF, 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.
AS29372
Rev. 2.6 06/05
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
3
oltag Re gulator
Volta g e Re gulator
Austin Semiconductor, Inc.
AS29372
SCHEMATIC DIAGRAM
AS29372
Rev. 2.6 06/05
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
4
oltag Re gulator
Volta g e Re gulator
Austin Semiconductor, Inc.
AS29372
TYPICAL CHARACTERISTICS
AS29372
Rev. 2.6 06/05
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
5
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