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PDF A5973D Data sheet ( Hoja de datos )
| Número de pieza | A5973D | |
| Descripción | 2.5A switch step down switching regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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A5973D
2.5A 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
HSOP8 exposed pad
■ 2A DC output current
■ Operating input voltage from 4V to 36V
Description
■ 3.3V / (±2%) reference voltage
■ Output voltage adjustable from 1.235V to 35V
■ Low dropout operation: 100% duty cycle
■ 250kHz 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
Figure 1. Typical application
The A5973D is a step down monolithic power
switching regulator with a minimum switch current
limit of 2.5A so it is able to deliver more than 2A
DC current to the load depending on the
application conditions. The output voltage can be
set from 1.235V to 35V. The high current level is
also achieved thanks to an SO8 package with
exposed frame, that allows to reduce the
Rth(JA) down to approximately 40°C/W. The
device uses an internal P-channel D-MOS
transistor (with a typical Rdson of 250mΩ) as
switching element to minimize the size of the
external components. An internal oscillator fixes
the switching frequency at 250kHz. Having a
minimum input voltage of 4V only, it is particularly
suitable for 5V bus. Pulse by pulse current limit
with the internal frequency modulation offers an
effective constant current short circuit protection.
Pulse by pulse current limit with the internal
frequency modulation offers an effective constant
current short circuit protection.
VIN=4V to 35V
VCC
8
OUT
1
L1 15uH
Vout=3.3V
C1
10uF
35V
CERAMIC
C4
22nF
C3
220pF
COMP
4
6
R3 VREF
4k7 3.3V
A5973D
7
SYNCH
2
FB
5
3
GND INH
D1
STPS340U
R1
5k6
C2
330uF
6.3V
R2
3k3
October 2007
Rev 2
1/14
www.st.com
1
1 page  
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A5973D
3 Electrical characteristics
Electrical characteristics
Table 4. Electrical characteristics (TJ=-40°C 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
4
RDS(on)
IL
MOSFET on resistance
Maximum limiting
current
VCC = 5V
2.5
fSW Switching frequency
Duty cycle
212
0
Dynamic characteristics (see test circuit)
V5 Voltage feedback
η Efficiency
DC characteristics
4.4V<VCC<36V,
20mA<I0<2A
V0=5V, VCC=12V
1.198
Iqop
Total operating
quiescent current
Iq
Iqst-by
Inhibit
Quiescent current
Duty cycle=0; VFB=1.5V
Total stand-by quiescent
current
Vinh > 2.2V
VCC=36V;
Vinh > 2.2V
INH threshold voltage
Device ON
Device OFF
2.2
Error amplifier
VOH High level output voltage VFB=1V
VOL Low level output voltage VFB=1.5V
3.5
Io source Source output current
VCOMP = 1.9V;
VFB = 1V
190
0.250
3
250
1.235
90
3
50
80
300
36
0.5
3.5
280
100
1.272
5
2.5
100
150
0.8
0.4
V
Ω
A
kHz
%
V
%
mA
mA
µA
µA
V
V
V
V
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
5/14
5 Page 
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A5973D
6 Order codes
Table 6. Order code
Order code
A5973D
A5973D013TR
Package
HSOP8
Order codes
Packing
Tube
Tape and reel
11/14
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet A5973D.PDF ] | |
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