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A7987 数据表(PDF) 6 Page - STMicroelectronics

部件名 A7987
功能描述  61 V, 3 A asynchronous step-down switching regulator with adjustable current limitation for automotive
PDF  36 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

A7987 数据表(HTML) 6 Page - STMicroelectronics

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4
Electrical characteristics
TJ = -40 °C to +125 °C, VIN = VCC = 24 V and VEN =3 V unless otherwise specified.
Table 5. Electrical characteristics
Symbol
Parameter
Test conditions
Min.
Typ.
Max. Unit
VIN
Operating input voltage range
4.5
61
V
RDSON HS
High- side RDS(on)
ISW=0.5 A; Tj = 25 °C
0.25
0.32
Ω
ISW=0.5 A
0.25
0.46
Ω
fSW
Switching frequency
FSW floating; Tj = 25 °C
233
250
267
kHz
FSW floating
225
250
275
kHz
Selected switching frequency
RFSW=10 kΩ
1350 1500 1650 kHz
IPK
Peak current limit
RLIM 20 kΩ; VFB = 0.6 V; TJ = 125 °C
(1)
3.2
3.7
4.4
A
RLIM 100 kΩ; VFB = 0.6 V
(1)
0.69
0.84
1.0
A
Ratio IPK_20k/IPK_100k
(2)
4.7
ISKIP
Pulse skipping peak current
(2)
0.5
A
VFOLD
Feedback fold-back level
(2)
400
mV
TONMAX
Maximum on-time
12
µs
TONMIN
Minimum on-time
120
150
ns
TOFFMIN
Minimum off-time
(2)
360
ns
VCC / VBIAS
VCCH
VCC UVLO rising threshold
3.85
4.10
4.30
V
VCCHYST
VCC UVLO hysteresis
150
250
380
mV
SWO
VBIAS threshold
Switch internal supply from VCC to VBIAS. VBIAS
ramping up from 0 V
2.84
2.90
3.03
V
Hysteresis
80
mV
VCC -VBIAS threshold
Switch internal supply from VCC to VBIAS. VIN=VCC=24
V, VBIAS falling from 24 V to GND
3.35
4.05
4.90
V
Hysteresis
900
mV
Power consumption
ISHTDWN
Shutdown current from VIN
VEN = GND; TJ = 25 °C
11
16
µA
VEN = GND
23
45
IQUIESC
Quiescent current from VIN and VCC
LX floating, VFB=1 V, VBIAS=GND, FSW floating
2.5
3.0
mA
IQOPVIN
Quiescent current from VIN and VCC
LX floating, VFB=1 V, VBIAS=3.3 V, FSW floating
1.0
1.3
mA
IQOPVBIAS
Quiescent current from VBIAS
1.6
2.2
mA
Enable
VEN
Device OFF level
0.06
0.30
V
Device ON level
0.35
0.90
V
Soft-start
A7987
Electrical characteristics
DS12928 - Rev 3
page 6/36



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