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PDF A5972D Data sheet ( Hoja de datos )
| Número de pieza | A5972D | |
| Descripción | 2A switch step down switching regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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A5972D
2A switch step down switching regulator
for automotive applications
Features
■ Qualified following the AEC-Q100
requirements (temperature Grade 3), see
PPAP for more details.
■ Temperature range -40 °C to 85 °C
■ 1.5 A DC output current
■ Operating input voltage from 4.4 V to 36 V
■ Output voltage adjustable from 1.235 V to 35 V
■ Low dropout operation: 100% duty cycle
■ 250 kHz internally fixed frequency
■ Voltage feedforward
■ Zero load current operation
■ Internal current limiting
■ Protection against feedback disconnection
■ Thermal shutdown
Applications
■ Dedicated to automotive applications
Figure 1. Typical application
SO8
Description
The A5972D is a step down monolithic power
switching regulator with a minimum switch current
limit of 2 A so it is able to deliver more than 1.5 A
DC current to the load depending on the
application conditions.
The output voltage can be set from 1.235 V
to 35 V. The device uses an internal P-channel D-
MOS transistor (with a typical Rdson of 250 mΩ)
as switching element to minimize the size of the
external components.
An internal oscillator fixes the switching frequency
at 250 kHz.
Having a minimum input voltage of 4.4 V only, it is
particularly suitable for 5 V bus.
Pulse by pulse current limit with the internal
frequency modulation offers an effective constant
current short circuit protection.
VIN=4.4V to 35V
VCC
OUT
C1
10uF
C4
22nF
C3
220pF
COMP
A5972D
4.7KΩ
R3
GND
FB
L1
33uH
D1
STPS2L40U
VOUT=3.3V
R1
5.6K
C2
100uF
R2
3.3K
November 2007
Rev 2
1/12
www.st.com
1
1 page  
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A5972D
3 Electrical characteristics
Table 4. Electrical characteristics (TJ=-40 to 85°C, VCC = 12V, unless otherwise specified)
Symbol
Parameter
Test condition
Min Typ Max Unit
VCC
Operating input voltage
range
V0=1.235V; I0=2A
RDS(on)
IL
Mosfet on resistance
Maximum limiting
current
VCC=5V
fSW Switching frequency
Duty cycle
Dynamic characteristics (see test circuit).
V5 Voltage feedback
η Efficiency
DC characteristics
4.4V<VCC<36V,
20mA<I0<2A
V0=5V, VCC=12V
Iqop
Total operating
quiescent current
4.4 36
0.250 0.5
2 2.5 3
212 250 280
0 100
V
Ω
A
kHz
%
1.198 1.235 1.272
90
V
%
3 5 mA
Iq Quiescent current
Error amplifier
Duty cycle=0; VFB=1.5V
2.5 mA
VOH High level output voltage VFB=1V
VOL Low level output voltage VFB=1.5V
3.5 V
0.4 V
Io source Source output current
VCOMP = 1.9V;
VFB = 1V
190 300
µA
Io sink Sink output current
Ib Source bias current
DC open loop gain
VCOMP = 1.9V;
VFB = 1.5V
RL= ∞
1 1.5
mA
2.5 4 µA
50 65
dB
gm Transconductance
ICOMP = -0.1mA to
2.3 mS
0.1mA; VCOMP = 1.9V
5/12
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A5972D
7 Revision history
Table 7. Document revision history
Date
Revision
Changes
06-Aug-2007
1 Initial release
5-Nov-2007
2 Updated: Table 4 on page 5
11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet A5972D.PDF ] | |
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