L5970D(2003) Ver la hoja de datos (PDF) - STMicroelectronics
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L5970D Datasheet PDF : 10 Pages
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L5970D
ELECTRICAL CHARACTERISTCS (Tj = 25°C, VCC = 12V, unless otherwise specified.)
(*) Specification Referred to Tj from -40 to +125°C (1).
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
VCC Operating input voltage
range
Vo = 1.235V; Io = 1A
*
4.4
36
V
Vd Dropout voltage
VCC = 4.4V; Io = 1A
*
0.25 0.5
V
Il
Maximum limiting current
VCC = 4.4V to 36V
*
1.5 1.87 2.25
A
fs Switching frequency
*
212 250 280 KHz
225 250 275 KHz
Duty cycle
0
100
%
DYNAMIC CHARACTERISTICS (see test circuit fig. xx note 1).
V5 Voltage feedback
4.4V < VCC < 36V,
20mA < IO < 1A
1.220 1.235 1.25
V
*
1.198 1.235 1.272
V
η
Efficiency
VO = 5V, VCC = 12V
90
%
DC CHARACTERISTICS
Iqop Total operating quiescent
current
*
3
5
mA
Iq
Quiescent current
Duty Cycle = 0; VFB = 1.5V
2.5
mA
Iqst-by Total stand-by quiescent
Vinh > 2.2V
*
current
VCC = 36V; Vinh > 2.2V
*
50
100
µA
80
150
µA
INHIBIT
INH Threshold voltage
Device ON
0.8
V
Device OFF
2.2
V
ERROR AMPLIFIER
VOH High level output voltage
VFB = 1V
3.5
V
VOL Low level output voltage
VFB = 1.5V
0.4
V
Io source Source output current
VCOMP = 1.9V; VFB = 1V
200 300
µA
Io sink Sink output current
Vcomp = 1.9V; VFB = 1.5V
1
1.5
mA
Ib Source bias current
2.5
4
µA
DC open loop gain
RL = ∞
50
65
dB
gm Transconductance
Icomp = -0.1mA to 0.1mA
Vcomp = 1.9V
2.3
mS
SYNC FUNCTION
High Input Voltage
VCC = 4.4V to 36V
2.5
VREF
V
Low Input Voltage
VCC = 4.4V to 36V
0.74
V
Slave Sink Current
Vsync = 0.74V (2)
Vsync = 2.33V
0.11
0.21
0.25 mA
0.45 mA
Master Output Amplitude
Isource = 3mA
2.75
3
V
Output Pulse Width
no load, Vsync = 1.65V
0.20 0.35
µs
REFERENCE SECTION
Reference Voltage
3.234 3.3 3.366 V
IREF = 0 to 5mA
VCC = 4.4V to 36V
*
3.2
3.3 3.399 V
Line Regulation
IREF = 0mA
VCC = 4.4V to 36V
5
10
mV
Load Regulation
IREF = 0 to 5mA
8
15
mV
Short Circuit Current
10
8
30
mA
Note (1): Specification over the -40 to +125 Tj Temperature range are assured by design, characterization and statistical correlation.
Note (2): Guaranteed by design.
3/10
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