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A5970D PDF 데이터시트 ( Data , Function )

부품번호 A5970D 기능
기능 1.5A switch step down switching regulator
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A5970D 데이터시트, 핀배열, 회로
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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 m) 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




A5970D pdf, 반도체, 판매, 대치품
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Electrical data
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
A5970D
Value
40
-1 to 40
-5 to 40
int. limit.
4
-0.3 to VCC
-0.3 to 4
0.75
-40 to 150
-55 to 150
Unit
V
V
V
V
V
V
W
°C
°C
SO8
120 (1)
Unit
°C/W
4/13

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A5970D 전자부품, 판매, 대치품
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A5970D
4 Typical characteristics
Figure 3. Junction temperature vs.
output current
Figure 4. Load regulator
Tj(°C)
130
120
110
100
90
80
70
60
50
40
30
20
0.2
Vcc=5V
Tamb=25°C
0.4 0.6
0.8 1
Io(A)
Vo=3.3V
Vo=2.5V
Vo=1.8V
1.2 1.4 1.6
Vo (V)
3.312
3.308
3.304
3.3
3.296
3.292
3.288
3.284
3.28
3.276
0
Vcc = 12V
Vo = 3.3V
Tj = 25°C
Tj = 125°C
0.5 1
Io (A)
1.5
Figure 5. Junction temperature vs.
output current
Figure 6. Line regulator
Tj(°C)
130
120
110
100
90
80
70
60
50
40
30
20
Vcc=12V
Tamb=25°C
0.2 0.4 0.6
0.8 1
Io(A)
Vo=5V Vo=3.3V
Vo=2.5V
1.2 1.4 1.6
Vo (V)
3.312
3.308
3.304
Vcc =12V
Vo =3.3V
3.3
3.296
3.292
3.288
3.284
3.28
3.276
0 10
Tj =25°C
Tj =125°C
20
Vcc (V)
30
40
Figure 7. Junction temperature vs.
output current
Tj(°C)
140
120
100
80
Vcc=24V
Tamb=25°C
60
40
20
0
0.2 0.4 0.6
Vo=18V
Vo=12V
Vo=5V
0.8
Io(A)
1
1.2
1.4
Figure 8. Output voltage vs. junction
temperature
Vo (V)
1.25
1.24
1.23
1.22
1.21
1.2
-50
Vcc = 12V
Vcc=12V
0 50 100 150
Tj (°C)
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A5970D

1.5A switch step down switching regulator

STMicroelectronics
STMicroelectronics

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