L4971D(2000) データシートの表示（PDF） - STMicroelectronics

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L4971D
(Rev.:2000)

1.5A STEP DOWN SWITCHING REGULATOR

STMicroelectronics 

L4971

ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

DC Characteristics

Iqop

Total operating quiescent

current

Iq

Quiescent current

Iqst-by

Total stand-by quiescent

current

Error Amplifier

VFB

Voltage Feedback Input

RL

Line regulation

Ref. voltage stability vs

temperature

VoH

High level output voltage

VoL

Low level output voltage

Io source Source output current

Io sink

Sink output current

Ib

Source bias current

SVRR E/A Supply voltage ripple rejection

DC open loop gain

gm

Transconductance

Oscillator Section

Ramp Valley

Ramp peak

Maximum duty cycle

Maximum Frequency

Duty Cycle = 0; VFB = 3.8V

Vinh <0.9V

Vcc = 55V; Vinh <0.9V

Vcc = 8 to 55V

VFB = 2.5V

VFB = 3.8V

Vcomp = 6V; VFB = 2.5V

Vcomp = 6V; VFB = 3.8V

Vcomp = Vfb; Vcc = 8 to 55V

RL = ∞

Icomp = -0.1 to 0.1mA

Vcomp = 6V

Vcc = 8V

Vcc = 55V

Duty Cycle = 0%

Rosc = 13kΩ, Cosc = 820pF

Min. Typ. Max. Unit

4

6

mA

2.5

3.5 mA

100 200 µA

150 300 µA

3.33 3.36 3.39

V

5

10

mV

*

0.4

mV/°C

10.3

V

0.65

V

200 300

µA

200 300

µA

2

3

µA

60

80

dB

50

57

dB

2.5

ms

0.78 0.85 0.92

V

2

2.15 2.3

V

9

9.6 10.2

V

95

97

%

500 kHz

4/12

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