Multi-Output, Low-Noise Power-Supply

Controllers for Notebook Computers

4

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Note 1: Each of the four digital soft-start levels is tested for functionality; the steps are typically in 20mV increments.

Note 2: High duty-factor operation supports low input-to-output differential voltages, and is achieved at a lowered operating

frequency (see Overload and Dropout Operation section).

Note 3: MAX1630A/MAX1632A/MAX1633A/MAX1635A only.

situations where the main outputs are being held up by external keep-alive supplies, turning off the 12OUT regulator pre-

Note 5: Since the reference uses VL as its supply, the reference’s V+ line-regulation error is insignificant.

ELECTRICAL CHARACTERISTICS (continued)

Typical hysteresis = +10°C

°C

150

Clks

5000

6144

7000

With respect to unloaded output voltage

Output Undervoltage Lockout Time

Thermal Shutdown Threshold

Falling edge, CSL_ driven 2%

below RESET trip threshold

Clks

27,000

32,000

37,000

µs

1.5

With respect to unloaded output voltage,

falling edge; typical hysteresis = 1%

RESET Propagation Delay

RESET Delay Time

%

-7

-5.5

-4

CONDITIONS

RESET Trip Threshold

RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),

V

0.4

µA

±1

Input Leakage Current

Logic Output Low Voltage

CSL_ driven 2% above overvoltage trip threshold

µs

FB3, FB5; SECFB = 2.6V

1.5

Overvoltage-Fault Propagation Delay

nA

150

With respect to unloaded output voltage

%

60

70

80

Feedback Input Leakage Current

Output Undervoltage Threshold

%

47

10

Overvoltage Trip Threshold

RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),

SHDN, STEER, SYNC

RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),

SHDN, STEER, SYNC

V

2.4

V

0.6

Logic Input Low Voltage

Logic Input High Voltage

UNITS

MIN

TYP

MAX

PARAMETER

High or low

DL3, DH3, DL5, DH5; forced to 2V

Ω

1.5

7

A

1

Gate Driver Sink/Source Current

Gate Driver On-Resistance

RESET = 3.5V

mA

1

Logic Output High Current

TIME/ON5 = 0V, SEQ = 0V or VL

SEQ = 0V or VL

µA

2.5

3

3.5

V

2.4

2.6

TIME/ON5 Input Trip Level

TIME/ON5 Source Current

TIME/ON5; RUN/ON3 = 0V, SEQ = 0V or VL

Ω

15

80

TIME/ON5 On-Resistance

FAULT DETECTION (MAX1630A/MAX1631A/MAX1632A)

INPUTS AND OUTPUTS

RESET