MAX1630A datasheet(4/29 Pages) MAXIM

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Multi-Output, Low-Noise Power-Supply

Controllers for Notebook Computers

_______________________________________________________________________________________

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.

Note 4: Off mode for the 12V linear regulator occurs when the SMPS that has flyback feedback (VDD) steered to it is disabled. In

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

vents a leakage path from the output-referred flyback winding, through the rectifier, and into VDD.

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

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, SKIP = 0V, TA = TMIN to TMAX, unless otherwise noted.

Typical values are at TA = +25°C.)

Typical hysteresis = +10°C

From each SMPS enabled, with respect to fOSC

°C

150

Clks

5000

6144

7000

With respect to unloaded output voltage

Output Undervoltage Lockout Time

Thermal Shutdown Threshold

With respect to fOSC

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

RESET, ISINK = 4mA

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

SHDN, STEER, SYNC, SEQ; VPIN = 0V or 3.3V

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

150

With respect to unloaded output voltage

Feedback Input Leakage Current

Output Undervoltage Threshold

Overvoltage Trip Threshold

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

SHDN, STEER, SYNC

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

SHDN, STEER, SYNC

2.4

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

1.5

Gate Driver Sink/Source Current

Gate Driver On-Resistance

RESET = 3.5V

Logic Output High Current

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

SEQ = 0V or VL

µA

2.5

3.5

2.4

2.6

TIME/ON5 Input Trip Level

TIME/ON5 Source Current

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

TIME/ON5 On-Resistance

FAULT DETECTION (MAX1630A/MAX1631A/MAX1632A)

INPUTS AND OUTPUTS

RESET

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