MAX1904 datasheet(9/33 Pages) MAXIM

Part #	MAX1904

Description	500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers

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Manufacturer	MAXIM [Maxim Integrated Products]

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500kHz Multi-Output, Low-Noise Power-Supply

Controllers for Notebook Computers

_______________________________________________________________________________________

9

Pin Description

SSOP

QFN

NAME

FUNCTION

1

29

CSH3

Current-Sense Input for the 3.3V SMPS. Current-limit level is 100mV referred to CSL3.

2

30

CSL3

Current-Sense Input. Also serves as the feedback input in fixed-output mode.

3

31

FB3

Feedback Input for the 3.3V SMPS. Regulates at FB3 = REF (approx. 2.5V) in

adjustable mode. FB3 is a dual-mode input that also selects the 3.3V fixed output

voltage setting when connected to GND. Connect FB3 to a resistor-divider for

adjustable-output mode.

12OUT

(MAX1902)

12V/120mA Linear-Regulator Output. Input supply comes from VDD. Bypass 12OUT to

GND with 1µF (min).

41

STEER

(MAX1901/

MAX1904)

Logic-Control Input for Secondary Feedback. Selects the PWM that uses a transformer

and secondary feedback signal (SECFB):

STEER = GND: 3.3V SMPS uses transformer

STEER = VL: 5V SMPS uses transformer

VDD

(MAX1902)

Supply Voltage Input for the 12OUT Linear Regulator. Also connects to an internal

resistor-divider for secondary winding feedback and to an 18V overvoltage shunt

regulator clamp.

52

SECFB

(MAX1901/

MAX1904)

Secondary Winding Feedback Input. Normally connected to a resistor-divider from an

auxiliary output. SECFB regulates at VSECFB = 2.5V (see the Secondary Feedback

Regulation Loop section). Connect to VL if not used.

6

3

SYNC

Oscillator Synchronization and Frequency Select. Connect to VL for 500kHz operation;

connect to GND for 333kHz operation. Can be driven at 400kHz to 583kHz for external

synchronization.

7

4

TIME/ON5

Dual-Purpose Timing Capacitor Pin and ON/

OFF Control Input. See the Power-Up

Sequencing and ON/

OFF Controls section.

8

5

GND

Low-Noise Analog Ground and Feedback Reference Point

9

7

REF

2.5V Reference Voltage Output. Bypass to GND with 1µF (min).

10

8

SKIP

Logic-control input that disables idle mode when high. Connect to GND for normal use.

11

9

RESET

Active-Low Timed Reset Output.

RESET swings GND to VL. Goes high after a fixed

32,000 clock-cycle delay following power-up.

12

10

FB5

Feedback Input for the 5V SMPS. Regulates at FB5 = REF (approx. 2.5V) in adjustable

mode. FB5 is a dual-mode input that also selects the 5V fixed output voltage setting

when connected to GND. Connect FB5 to a resistor-divider for adjustable-output

mode.

13

11

CSL5

Current-Sense Input for the 5V SMPS. Also serves as the feedback input in fixed-output

mode, and as the bootstrap supply input when the voltage on CSL5/VL is > 4.5V.

14

12

CSH5

Current-Sense Input for the 5V SMPS. Current-limit level is 100mV referred to CSL5.

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