MAX8741ETJ datasheet(10/33 Pages) MAXIM

Part #	MAX8741ETJ

Description	500kHz Multi-Output Power-Supply Controllers with High Impedance in Shutdown

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Manufacturer	MAXIM [Maxim Integrated Products]

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10 / 33 page

500kHz Multi-Output Power-Supply Controllers

with High Impedance in Shutdown

10

______________________________________________________________________________________

Pin Description (continued)

SSOP

TQFN

NAME

FUNCTION

15

13

SEQ

Pin-Strap Input that Selects the SMPS Power-Up Sequence:

SEQ = GND: 5V before 3.3V, RESET output determined by both outputs

SEQ = REF: Separate ON3/ON5 controls, RESET output determined by 3.3V

output

SEQ = VL: 3.3V before 5V, RESET output determined by both outputs

16

14

DH5

Gate-Drive Output for the 5V, High-Side N-Channel Switch. DH5 is a floating driver

output that swings from LX5 to BST5, riding on the LX5 switching-node voltage.

17

15

LX5

Switching-Node (Inductor) Connection. Can swing 2V below ground without hazard.

18

17

BST5

Boost Capacitor Connection for High-Side Gate Drive (0.1µF)

19

18

DL5

Gate-Drive Output for the Low-Side Synchronous-Rectifier MOSFET. Swings 0 to VL.

20

19

PGND

Power Ground

21

20

VL

5V Internal Linear-Regulator Output. VL is also the supply-voltage rail for the chip.

After the 5V SMPS output has reached 4.5V (typ), VL automatically switches to the

output voltage through CSL5 for bootstrapping. Bypass to GND with 4.7µF. VL

supplies up to 25mA for external loads.

22

21

V+

Battery Voltage Input, 4.2V to 30V. Bypass V+ to PGND close to the IC with a 0.22µF

capacitor. Connects to a linear regulator that powers VL.

23

22

SHDN

Shutdown Control Input, Active Low. Logic threshold is set at approximately 1V. For

automatic startup, connect SHDN to V+ through a 220kΩ resistor and bypass SHDN to

GND with a 0.01µF capacitor.

24

23

DL3

Gate-Drive Output for the Low-Side Synchronous-Rectifier MOSFET. Swings 0 to VL.

25

24

BST3

Boost Capacitor Connection for High-Side Gate Drive (0.1µF)

26

LX3

Switching-Node (Inductor) Connection. Can swing 2V below ground without hazard.

27

DH3

Gate-Drive Output for the 3.3V, High-Side N-Channel Switch. DH3 is a floating driver

output that swings from LX3 to BST3, riding on the LX3 switching-node voltage.

28

RUN/ON3

ON/OFF Control Input. See the Power-Up Sequencing and ON/OFF Controls section.

—

6, 16, 25, 32

N.C.

No Connection

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