L5957 データシートの表示（PDF） - STMicroelectronics
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L5957 Datasheet PDF : 16 Pages
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L5957
Electrical specifications
Table 4. Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min. Typ. Max. Unit
Ignition buffer (push-pull with schmitt trigger)
IGNIN
IGNout falling
IGNIN
IGNout rising
Vhys(IGNout) Hysteresis of ignition buffer
IHsource(IGNout) High level source current
ILsink(IGNout) Low level sink current
Vol
Low level
Voh
High level
IGNRISE Rising time
IGNFALL Fall time
ICLAMP
Input clamp current
IGNIN
Input voltage
-
-
-
IGNout = 0 V
IGNout = 5 V
ILsink (IGNout) = 1 mA
-
C = 15 pF
C = 15 pF
VCC < VIGN < 50 V
Operative
Enable input (regulators 1,3,4 and power switch)
1.03 1.17 1.28
V
1.18 1.27 1.33
V
30
50 100 mV
1000 1500 2000 μA
10
15
20
mA
-
0.3 0.5
V
4.5 Vreg2 5.5
V
-
-
10
μs
-
-
10
μs
-
-
2
mA
0
-
50
V
VTH
Voltage threshold
-
1.3
-
2.3
V
ENIN
Input voltage
Operative
0
-
5
V
1. Drop condition means that the supply voltage drop down to 100 mV from the regulated output and the regulator is sourcing
its maximal load current.
Figure 3. Typical application circuit
Vs
VIN1
470 µF
100 nF
EN SW
470 µF
BU
VIN2
ENREG3
ENREG1-4
POWER
SWITCH
REG1
REG2
REG3
REG4
THERMAL
DUMP LOAD
PROTECTION PROTECTION
10 KΩ IGNIN
1 nF
IGNITION
BUFFER
IGNOUT
SW
REG 1
22 µF
REG 2
REG 3
Cfilt (*)
Cfilt (*)
10 KΩ
REG 4
Cfilt (*)
HOLD
to µProcessor
Cfilt (*)
RESET
BUFFER
RES
CRES
to µProcessor
47 nF
AC00427
(*) Recommended output filtering capacitors for all the regulators: C range = 5 µF to 100 µF, ESR range = 0.5 Ω to 10 Ω (T= -40 ˚C to +85 ˚C)
Doc ID 14442 Rev 2
9/16
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