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A5973D PDF 데이터시트 ( Data , Function )

부품번호 A5973D 기능
기능 2.5A switch step down switching regulator
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A5973D 데이터시트, 핀배열, 회로
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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 250m) 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




A5973D pdf, 반도체, 판매, 대치품
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A5973D
2 Electrical data
2.1
Maximum ratings
Table 2. Absolute maximum ratings
Symbol
Parameter
V8
V1
I1
V4 , V5
V3
V2
PTOT
TJ
TSTG
Input voltage
OUT pin DC voltage
OUT pin peak voltage at t=0.1µs
Maximum output current
Analog pins
INH
SYNCH
Power dissipation at TA 70°C
Operating junction temperature range
Storage temperature range
2.2
Thermal data
Table 3. Thermal data
Symbol
Parameter
RthJA
Maximum thermal resistance junction-ambient
1. Package mounted on board
Electrical data
Value
40
-1 to 40
-5 to 40
int. limit.
4
-0.3 to VCC
-0.3 to 4
2.25
-40 to 150
-55 to 150
Unit
V
V
V
V
V
V
W
°C
°C
SO8
40 (1)
Unit
°C/W
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A5973D 전자부품, 판매, 대치품
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A5973D
4 Typical characteristics
Typical characteristics
Figure 2. Line regulatior
Figure 3. Output voltage vs. junction
temperature
Figure 4. Quiescent current vs.
junction temperature
Figure 5. Shutdown current vs.
junction temperature
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A5973D

2.5A switch step down switching regulator

STMicroelectronics
STMicroelectronics

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