A5973D [STMICROELECTRONICS]
2.5A switch step down switching regulator for automotive applications; 2.5A开关降压用于汽车应用的开关稳压器
| 型号： | A5973D |
| 厂家： | 
ST |
| 描述： | 2.5A switch step down switching regulator for automotive applications |
| 文件： | 总13页 (文件大小：827K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
■ 2A DC output current
HSOP8 exposed pad
■ Operating input voltage from 4V to 36V
■ 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
Description
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
■ Zero load current operation
■ Internal current limiting
R
down to approximately 40°C/W. The
th(JA)
■ Inhibit for zero current consumption
■ Synchronization
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.
■ Protection against feedback disconnection
■ Thermal shutdown
Applications
■ Dedicated to automotive applications
Figure 1.
Typical application
L1 15uH
Vout=3.3V
VIN=4V to 35V
OUT
1
VCC
8
4
SYNCH
COMP
2
5
R1
D1
C4
A5973D
5k6
STPS340U
C1
10uF
22nF
C2
330uF
6.3V
FB
6
7
3
35V
C3
VREF
3.3V
R3
CERAMIC
R2
INH
GND
220pF
4k7
3k3
October 2007
Rev 2
1/14
www.st.com
1
A5973D
Contents
Contents
1
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1
1.2
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1
2.2
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3
4
5
6
7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1/14
A5973D
Pin settings
1
Pin settings
1.1
Pin connection
Figure 1.
Pin connection (top view)
1.2
Pin description
Table 1.
N
Pin description
Pin
Description
1
2
OUT
Regulator output.
SYNCH
Master/slave synchronization.
A logical signal (active high) disables the device. If INH not used the pin
must be grounded. When it is open an internal pull-up disable the
device.
3
INH
4
5
COMP
FB
E/A output for frequency compensation.
Feedback input. Connecting directly to this pin results in an output
voltage of 1.23V. An extenal resistive divider is required for higher output
voltages.
6
7
8
VREF
GND
VCC
3.3V VREF. No cap is requested for stability.
Ground.
Unregulated DC input voltage.
3/14
A5973D
Electrical data
2
Electrical data
2.1
Maximum ratings
Table 2.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
V8
V1
Input voltage
40
V
OUT pin DC voltage
-1 to 40
-5 to 40
V
V
OUT pin peak voltage at ∆t=0.1µs
I1
V4 , V5
V3
Maximum output current
Analog pins
int. limit.
4
V
INH
-0.3 to VCC
-0.3 to 4
2.25
V
V
V2
SYNCH
PTOT
TJ
Power dissipation at TA ≤ 70°C
Operating junction temperature range
Storage temperature range
W
°C
°C
-40 to 150
-55 to 150
TSTG
2.2
Thermal data
Table 3.
Symbol
Thermal data
Parameter
SO8
Unit
RthJA
Maximum thermal resistance junction-ambient
40 (1)
°C/W
1. Package mounted on board
4/14
A5973D
Electrical characteristics
3
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
Operating input voltage
range
VCC
RDS(on)
IL
V0=1.235V; I0=2A
4
36
0.5
3.5
V
Ω
A
MOSFET on resistance
0.250
3
Maximum limiting
current
VCC = 5V
2.5
fSW
Switching frequency
Duty cycle
212
0
250
280
100
kHz
%
Dynamic characteristics (see test circuit)
4.4V<VCC<36V,
20mA<I0<2A
V5
Voltage feedback
Efficiency
1.198
1.235
90
1.272
V
η
V0=5V, VCC=12V
%
DC characteristics
Total operating
Iqop
Iq
3
5
mA
quiescent current
Quiescent current
Duty cycle=0; VFB=1.5V
Vinh > 2.2V
2.5
mA
50
80
100
µA
Total stand-by quiescent
current
Iqst-by
VCC=36V;
150
µA
Vinh > 2.2V
Inhibit
Device ON
0.8
V
V
INH threshold voltage
Device OFF
2.2
3.5
Error amplifier
VOH
VOL
High level output voltage VFB=1V
V
V
Low level output voltage VFB=1.5V
0.4
V
COMP = 1.9V;
FB = 1V
Io source
190
1
300
1.5
µA
Source output current
Sink output current
V
V
COMP = 1.9V;
FB = 1.5V
Io sink
Ib
mA
V
Source bias current
DC open loop gain
2.5
65
4
µA
RL = ∞
COMP = -0.1mA to
0.1mA; VCOMP = 1.9V
50
dB
I
gm
Transconductance
2.3
mS
5/14
A5973D
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
Synch function
High input voltage
Low input voltage
2.5
VREF
0.74
V
V
V
CC= 4.4 to 36V;
VCC= 4.4 to 36V;
Vsynch= 0.74V(1)
Vsynch= 2.33V
0.11
0.21
0.25
0.45
Slave synch current
mA
Master output amplitude
Output pulse width
2.75
0.20
3
V
Isource= 3mA
0.35
µs
no load, Vsynch= 1.65V
Reference section
IREF = 0 to 5mA
Reference voltage
Line regulation
3.2
3.3
5
3.399
10
V
VCC = 4.4V to 36V
IREF = 0mA
CC = 4.4V to 36V
mV
V
Load regulation
8
15
35
mV
mA
IREF = 0mA
Short circuit current
10
18
1. Guarantee by design
6/14
A5973D
Typical characteristics
4
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
7/14
A5973D
Typical characteristics
Figure 6.
Switching frequency vs
junction temperature
Figure 7.
Junction temperature vs.
output current
Figure 8.
Junction temperature vs.
output current
Figure 9.
Efficiency vs. output current
Figure 10. Efficiency vs. output current
8/14
A5973D
Package mechanical data
5
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect . The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com
9/14
A5973D
Package mechanical data
Table 5.
Dim
HSOP8 mechanical data
mm
inch
Min
Typ
Max
Min
Typ
Max
A
A1
A2
b
1.70
0.10
0.0669
0.0039
0.00
1.25
0.31
0.17
4.80
5.80
3.80
0.00
0.0492
0.0122
0.0067
0.1890
0.2283
0.1496
0.51
0.25
5.00
6.20
4.00
0.0201
0.0098
0.1969
0.2441
0.1575
c
D
4.90
6.00
3.90
1.27
0.1929
E
E1
e
h
0.25
0.40
0.50
1.27
0.0098
0.0157
0.0197
0.0500
L
k
0° (min), 8° (max)
ccc
0.10
0.0039
Figure 11. Package dimensions
10/14
A5973D
Order codes
6
Order codes
Table 6.
Order code
Order code
Package
Packing
A5973D
Tube
HSOP8
A5973D013TR
Tape and reel
11/14
A5973D
Revision history
7
Revision history
Table 7.
Date
Document revision history
Revision
Changes
06-Aug-2007
23-Oct-2007
1
2
Initial release
Updated: Table 4 on page 5, Table 5 on page 10
12/14
A5973D
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