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PDF A5970D Data sheet ( Hoja de datos )
| Número de pieza | A5970D | |
| Descripción | 1.5A switch step down switching regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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A5970D
1.5A 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
■ Up to 1 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
■ Inhibit for zero current consumption
■ Synchronization
■ Protection against feedback disconnection
■ Thermal shutdown
Applications
■ Dedicated to automotive applications
SO-8
Description
The A5970D is a step down monolithic power
switching regulator capable to deliver up to 1 A at
output voltages from 1.2 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.
Figure 1. Typical application
VIN=4.4V to 35V
C1
10uF
35V
CERAMIC
C4
22nF
C3
220pF
VCC
8
COMP
4
6
R3 VREF
4k7 3.3V
OUT
1
A5970D
7
SYNCH
2
FB
5
3
GND INH
L1 33uH
D1
STPS340U
Vout=3.3V
R1
5k6
C2
100uF
10V
R2
3k3
October 2007
Rev 2
1/13
www.st.com
1
1 page  
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A5970D
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=1A
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
1.5 1.87 2.25
212 250 280
0 100
V
Ω
A
kHz
%
1.198 1.235 1.272
90
V
%
3 5 mA
Iq
Iqst-by
Inhibit
Quiescent current
Duty ycle=0; VFB=1.5V
Total stand-by quiescent
current
Vinh > 2.2V
VCC=36V;
Vinh > 2.2V
2.5 mA
50 100 µA
80 150 µA
INH threshold voltage
Device ON
Device OFF
0.8 V
2.2 V
Error amplifier
VOH
VOL
Io source
Io sink
Ib
High level output voltage VFB=1V
Low level output voltage VFB=1.5V
Source output current
VCOMP = 1.9V;
VFB = 1V
Sink output current
VCOMP = 1.9V;
VFB = 1.5V
Source bias current
3.5
0.4
190 300
V
V
µA
1 1.5
mA
2.5 4 µA
DC open loop gain
RL= ∞
50 65
dB
gm Transconductance
ICOMP = -0.1mA to
0.1mA; VCOMP = 1.9V
2.3
mS
5/13
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A5970D
6 Order codes
Table 6. Order code
Order code
A5970D
A5970D13TR
Package
SO-8
Packing
Tube
Tape and reel
11/13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet A5970D.PDF ] | |
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