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A7985ATR Datasheet(PDF) 8 Page - STMicroelectronics

Part # A7985ATR
Description  2 A step-down switching regulator for automotive applications
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A7985ATR Datasheet(HTML) 8 Page - STMicroelectronics

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Electrical characteristics
A7985A
8/44
DocID023128 Rev 5
4
Electrical characteristics
TJ = -40 °C to 125 °C, VCC = 12 V, unless otherwise specified.
Table 4. Electrical characteristics
Symbol
Parameter
Test conditions
Values
Unit
Min.
Typ.
Max.
VCC
Operating input voltage range
4.5
38
V
VCCON
Turn-on VCC threshold
4.5
VCCHYS
VCC UVLO hysteresis
0.1
0.4
RDS(on)
MOSFET on-resistance
200
400
m
ILIM
Maximum limiting current
2.5
3.5
A
Oscillator
FSW
Switching frequency
210
250
275
kHz
VFSW
FSW pin voltage
1.254
V
D
Duty cycle
0
100
%
FADJ
Adjustable switching frequency
RFSW = 33 k
1000
kHz
Dynamic characteristics
VFB
Feedback voltage
4.5 V < VCC < 38 V
0.588
0.6
0.612
V
DC characteristics
IQ
Quiescent current
Duty cycle = 0, VFB = 0.8 V
2.4
mA
IQST-BY
Total standby quiescent current
20
30
A
Enable
VEN
EN threshold voltage
Device OFF level
0.3
V
Device ON level
1.2
IEN
EN current
EN = VCC
7.5
10
µA
Soft-start
TSS
Soft-start duration
FSW pin floating
7.3
8.2
9.8
ms
FSW = 1 MHz, RFSW = 33 k
2
Error amplifier
VCH
High level output voltage
VFB < 0.6 V
3
V
VCL
Low level output voltage
VFB > 0.6 V
0.1
IO SOURCE
Source COMP pin
VFB = 0.5 V, VCOMP = 1 V
19
mA
IO SINK
Sink COMP pin
VFB = 0.7 V, VCOMP = 0.75 V
30
mA
GV
Open loop voltage gain
(1)
100
dB


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