MAX8667ETEAA+【PDF 8/18 页】IC REG QD BCK/LINEAR SYNC 16TQFN

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Sheet目录44

4页 5页 6页 7页 [8页]9页 10页 11页 12页

1.5MHz Dual Step-Down DC-DC Converters

with Dual LDOs and Individual Enables

8 _______________________________________________________________________________________

Pin Description

NAME

MAX8667 MAX8668

FUNCTION

EN3 EN3

Enable Input for Regulator 3. Drive EN3 high or connect to IN34 to turn on regulator 3. Drive low

to turn off regulator 3 and reduce input quiescent current.

2 OUT3 OUT3

Output of Regulator 3. Bypass OUT3 with a 4.7礔 ceramic capacitor to GND. OUT3 is

discharged to GND through an internal 1k& in shutdown.

IN34 IN34

Input Voltage for LDO Regulators 3 and 4. Supply voltage range is from 1.7V to 5.5V. This

supply voltage must not exceed V

IN12

. Connect a 4.7礔 or larger ceramic capacitor from IN34

to ground.

4 OUT4 OUT4

Output of Regulator 4. Bypass OUT4 with a 4.7礔 ceramic capacitor to GND. OUT4 is

discharged to GND through an internal 1k& in shutdown.

EN4 EN4

Enable Input for Regulator 4. Drive EN4 high or connect to IN34 to turn on regulator 4. Drive low

to turn off regulator 4 and reduce input quiescent current.

6 GND GND Ground

REF REF Reference Output. Bypass REF with a 0.01礔 ceramic capacitor to GND.

8 OUT2 Feedback Input for Regulator 2. Connect OUT2 directly to the output of step-down regulator 2.

FB2

Feedback Input for Regulator 2. Connect FB2 to the center of a resistor feedback divider

between the output of regulator 2 and ground to set the output voltage. See the Setting the

Output Voltages and Voltage Positioning section.

9 PGND2 PGND2 Power Ground for Step-Down Regulator 2

10 LX2

LX2 Inductor Connection for Regulator 2

11 IN12 IN12

Input Voltage for Step-Down Regulators 1 and 2. Supply voltage range is from 2.6V to 5.5V. This

supply voltage must not be less than V

IN34

. Connect a 10礔 or larger ceramic capacitor from

IN12 to ground.

12 LX1

LX1 Inductor Connection for Regulator 1

13 PGND1 PGND1 Power Ground for Step-Down Regulator 1

14 OUT1 Feed b ack Inp ut for Reg ul ator 1. C

onnect OU T1 d i r

ectl y to the outp ut of step

- d

ow n r eg ul ator 1.

FB1

Feedback Input for Regulator 1. Connect FB1 to the center of a resistor feedback divider

between the output of regulator 1 and ground to set the output voltage. See the Setting the

Output Voltages and Voltage Positioning section.

15 EN1 EN1

E nab l e Inp ut for Reg ul ator

1. D r i ve E N 1 hi g h or connect to IN 12 to tur n on step - d ow

n r eg

ator 1.

D r

i ve l ow to tur n off the r eg ul ator

and r ed uce i np ut q ui escent cur r ent.

16 EN2 EN2

E nab l e Inp ut for Reg ul ator

2. D r i ve E N 2 hi g h or connect to IN 12 to tur n on step - d ow

n r eg

ator 2.

D r

i ve l ow to tur n off the r eg ul ator

and r ed uce i np ut q ui escent cur r ent.

EP Exposed Paddle. Connect to GND, PGND1, PGND2, and circuit ground.

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