MAX8668 Maxim Integrated Products, MAX8668 Datasheet - Page 8

• Manufacturer Part Number: MAX8668
• Description: (MAX8667 / MAX8668) First Dual Step-Down DC-DC Converters
• Manufacturer: Maxim Integrated Products

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1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
8
PIN
_______________________________________________________________________________________
10
11
12
13
14
15
16
—
1
2
3
4
5
6
7
8
9
MAX8667
PGND2
PGND1
OUT3
OUT4
OUT2
OUT1
GND
IN34
IN12
EN3
EN4
EN1
EN2
REF
LX2
LX1
EP
—
—
NAME
MAX8668
PGND2
PGND1
OUT3
OUT4
GND
IN34
IN12
EN3
EN4
EN1
EN2
REF
FB2
FB1
LX2
LX1
EP
—
—
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.
Output of Regulator 3. Bypass OUT3 with a 4.7µF ceramic capacitor to GND. OUT3 is
discharged to GND through an internal 1kΩ in shutdown.
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
to ground.
Output of Regulator 4. Bypass OUT4 with a 4.7µF ceramic capacitor to GND. OUT4 is
discharged to GND through an internal 1kΩ in shutdown.
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.
Ground
Reference Output. Bypass REF with a 0.01µF ceramic capacitor to GND.
Feedback Input for Regulator 2. Connect OUT2 directly to the output of step-down regulator 2.
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.
Power Ground for Step-Down Regulator 2
Inductor Connection for Regulator 2
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
IN12 to ground.
Inductor Connection for Regulator 1
Power Ground for Step-Down Regulator 1
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.
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.
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 ul 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.
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 ul 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.
Exposed Paddle. Connect to GND, PGND1, PGND2, and circuit ground.
IN12
. Connect a 4.7µF or larger ceramic capacitor from IN34
IN34
FUNCTION
. Connect a 10µF or larger ceramic capacitor from
Pin Description