Datasheet

MAX8662/MAX8663
Power-Management ICs for
Single-Cell, Li+ Battery-Operated Devices
______________________________________________________________________________________ 19
Pin Description (continued)
PIN
MAX8662 MAX8663
NAME
FUNCTION
19 16 IN45
Input Supply for Linear Regulators 4 and 5. Connect IN45 to a supply voltage between 1.7V
and V
SYS
. Connect at least a 1µF ceramic capacitor from IN45 to GND.
20 17
OUT5
Linear Regulator 5 Output. Delivers up to 150mA at an output voltage determined by SL1
and SL2. Connect a 1µF ceramic capacitor from OUT5 to GND. Increase the value to 2.2µF
if V
OUT5
< 1.5V.
21 18 EN4 Enable Input for Linear Regulator 4. Drive high to enable.
22 19 EN5 Enable Input for Linear Regulator 5. Drive high to enable.
23 20 PWM
PWM/Skip-Mode Selector. Drive PWM high to force step-down regulators 1 and 2 to
operate in 1MHz forced-PWM mode. Drive PWM low, or connect to GND to allow regulators
1 and 2 to enter skip mode at light loads.
24 21 FB1
Feedback Input for Buck Regulator 1. Connect FB1 to the center of a resistor-divider
connected between OUT1 and GND to set the output voltage between 0.98V and 3.3V.
25 22 EN1 Enable Input for Buck Regulator 1. Drive high to enable.
26 23 PG1
Power Ground for Buck Regulator 1. GND, PG1, PG2, and PG3 must be connected
together externally.
27 24 LX1
Buck Regulator 1 Inductor Connection Node. Connect an inductor from LX1 to the output of
regulator 1.
28 25 PV1
P ow er Inp ut for Buck Reg ul ator 1. C onnect P V 1 to S Y S and d ecoup l e w i th a 10µF or g r eater l ow -
E S R cap aci tor to GN D . P V 1, P V 2, and S Y S m ust b e connected tog ether exter nal l y.
29 OVP
LED Boost Overvoltage Input. Connect a resistor from OVP to the boost output to set the
maximum output voltage and to initiate soft-start when EN3 goes high. An internal 20µA
pulldown current from OVP to GND determines the maximum boost voltage. The internal
current is disconnected when EN3 is low. OVP is diode clamped to SYS_.
30 CS
LED Current Source. Sinks from 1mA to 30mA depending on the voltage at BRT and the
PWM signal at EN3. Driving EN3 low for more than 2ms turns off the current source. V
CS
is
regulated to 0.32V.
31 CC3
C om p ensati on Inp ut for LE D Boost Regul ator 3. S ee the Boost C onverter w i th Whi te LE D D r i ver
( OU T3, M AX 8662 Onl y) secti on.
32 26 FB2
Feedback Input for Buck Regulator 2. Connect FB2 to the center of a resistor-divider
connected between OUT2 and GND to set the output voltage between 0.98V and 3.3V.
33 27 PV2
Power Input for Buck Regulator 2. Connect PV2 to SYS and decouple with a 10µF or
greater low-ESR capacitor to GND. PV1, PV2, and SYS must be connected together
externally.
34 28 LX2
Buck Regulator 2 Inductor Connection Node. Connect an inductor from LX2 to the output of
regulator 2.
35 29 PG2
P ower Gr ound for Buck Reg ulator 2. GN D , P G1, P G2, and PG3 must b e connected together
exter nal l y.
36 30 EN2 Enable Input for Buck Regulator 2. Drive high to enable.
37 31 EN6 Enable Input for Linear Regulator 6. Drive high to enable.
38 32 EN7 Enable Input for Linear Regulator 7. Drive high to enable.
39 LX3 Boost Regulator 3 Inductor Connection Node. Connect an inductor from LX3 to SYS_.