L4964 datasheet(5/13 Pages) STMICROELECTRONICS

5 / 13 page

ELECTRICAL CHARACTERISTICS

(refer to the test circuits Tj = 25

oC, Vi = 25V, unless otherwise specified)

Symbol

Parameter

Test Conditions

Min.

Typ. Max.

Unit

Fig.

DYNAMIC CHARACTERISTICS (pin 6 to GND unless otherwise specified)

Output Voltage Range

Vi = 36V, Io = 1A

Vref

28V4

Input Voltage Range

Vo = Vref to 28V, Io = 3A

∆Vo

Line Regulation

Vi = 10V to 30V, Vo = Vref, Io = 2A

∆Vo

Load Regulation

Io = 1A to 2A

Io = 0.5A to 3A, Vo = Vref

Vref

Internal Reference Voltage (Pin 10) Vi = 9V to 36V, Io = 2A

4.95

5.1

5.25

∆Vref

∆T

Average Temperature Coefficient

of Reference Voltage

Tj = 0

°C to 125°C, Io = 2A

0.4

mV/

°C

Dropout Voltage between Pin 2

and Pin 3

Io = 3A

Io = 2A

1.5

3.2

2.4

Iom

Maximum Operating Load Current

VI = 9V to 36V, Vo = Vref to 28V

I2L

Current Limiting Threshold (Pin 2)

Vi = 9V to 36V, Vo = Vref to 28V

4.5

ISH

Input Average Current

Vi = 36V, Output Short-circuited

140

Efficiency

Io = 3A

Vo = Vref

Vo = 12V

SVR

Supply Voltage Ripple Rejection

∆VI = 2Vrms, fripple = 100Hz

Vo = Vref, Io = 2A

–

Switching Frequency

kHz

∆f

∆Vi

Voltage Stability of Switching

Frequency

Vi = 9V to 36V

0.5

∆f

∆Tj

Temperature Stability of Switching

Frequency

Tj = 0

°C to 125°C1

fmax

Maximum Operating Switching

Frequency

Vo = Vref, Io = 1A

120

kHz

–

Tsd

Thermal Shutdown Junction

Temperature

135

145

°C–

DC CHARACTERISTICS

I3Q

Quiescent Drain Current

Vi = 36V, V7 = 0V, S1 : B, S2 : B

V6 = 0V

V6 = 3V

100

–I2L

Output Leakage Current

Vi = 36V, V6 = 3 V, V7 = 0V

S1 : B, S2 : A

2mA

SOFT START

I5so

Source Current

V6 = 0V, V5 = 3V

130

180

µA6b

I5si

Sink Current

V6 = 3V, V5 = 3V

140

µA6b

INHIBIT

V6L

Low Input Voltage

Vi = 9V to 36V, V7 = 0V

S1 : B, S2 : B

- 0.3

0.8

V6H

High Input Voltage

5.5

– I6L

–I6H

Input Current with Input Voltage

Low Level

High Level

Vi = 9V to 36V, V7 = 0V

S1 : B, S2 : B

V6 = 0.8V

V6 = 2V

µA6a

ERROR AMPLIFIER

V9H

High Level Output Voltage

V10 = 4.7V, I9 = 100

µA, S1 : A,

S2 : A

3.4

V9L

Low Level Output Voltage

V10 = 5.3V, I9 = 100

µA, S1 : A,

S2 : E

0.6

I9 si

Sink Output Current

V10 = 5.3V, S1 : A, S2 : B

100

150

µA6c

–I9 so

Source Output Current

V10 = 4.7V, S1 : A, S2 : D

100

150

µA6c

L4964

5/13

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