Multi-Output, Low-Noise Power-Supply

Controllers for Notebook Computers

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3

ELECTRICAL CHARACTERISTICS (continued)

V+ = VL = 0V,

CSL3 = CSH3 = CSL5 = CSH5 = 5.5V

µA

0.01

10

Not tested

Current-Sense Input Leakage Current

Not tested

Rising edge, hysteresis = 1% (Note 3)

V

18

20

µs

1

Falling edge (MAX1631A/MAX1634A)

DL Pulse Width

Falling edge (Note 3)

V

2.44

2.60

V

13

14

CONDITIONS

SECFB Regulation Threshold

µA

30

mA

10

ns

200

ns

200

SYNC Input High Pulse Width

SYNC Input Low Pulse Width

V

11.65

12.1

12.50

12OUT Output Voltage

UNITS

MIN

TYP

MAX

PARAMETER

Not tested

ns

200

SYNC Rise/Fall Time

kHz

240

350

SYNC Input Frequency Range

µA

50

100

mA

150

12OUT Current Limit

Rising edge of CSL5, hysteresis = 1%

Falling edge, hysteresis = 1%

V

4.2

4.5

4.7

V

3.5

3.6

3.7

VL Undervoltage Lockout

Fault Threshold

VL Switchover Threshold

SHDN = V+, RUN/ON3 = TIME/ON5 = 0V,

V

4.7

5.1

VL Output Voltage

Falling edge

V

1.8

2.4

µA

10

REF Sink Current

REF Fault Lockout Voltage

V+ = 4V to 24V, SHDN = 0V

V+ = 4.2V to 5.5V, both SMPSs off,

includes current into SHDN

µA

410

µA

50

200

V+ Standby Supply Current

in Dropout

V+ Shutdown Supply Current

V+ = 5.5V to 30V, both SMPSs off,

includes current into SHDN

VL switched over to CSL5, 5V SMPS on

µA

30

60

µA

550

V+ Operating Supply Current

V+ Standby Supply Current

No external load (Note 5)

12.5

V

2.45

2.5

2.55

REF Output Voltage

2.5

4

Both SMPSs enabled, FB3 = FB5 = 0V,

CSL3 = CSH3 = 3.5V,

CSL5 = CSH5 = 5.3V

mW

1.5

4

Quiescent Power Consumption

(Note 3)

MAX1631A/

MAX1634A

mV

100.0

REF Load Regulation

FLYBACK CONTROLLER

12V LINEAR REGULATOR (Note 3)

INTERNAL REGULATOR AND REFERENCE