Manual

MAX8621Y/MAX8621Z
Dual Step-Down DC-DC Power-Management ICs
for Portable Devices
6 _______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 3, V
IN1
= V
IN2
= V
IN3
= 3.6V, PWRON = IN, V
BUCK1
= 1.375V, V
BUCK2
= 1.8V, V
OUT1
= 2.6V, V
OUT2
= 2.6V, V
OUT3
= 1.8V, V
OUT4
= 3.0V, SEL1 = SEL2 = open, LX1 = LX2 = Murata LQH32CN2R2M53, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8621 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
5.04.54.03.53.0
120
140
160
180
200
220
240
260
280
300
100
2.5 5.5
NO LOAD
BUCK1, BUCK2, OUT1, OUT2: ON
STARTUP WAVEFORMS
MAX8621 toc02
50µs/div
5V/div
0
PWRON
BUCK1
BUCK2
OUT1
OUT2
2V/div
0
2V/div
0
5V/div
0
5V/div
0
SHUTDOWN WAVEFORMS
MAX8621 toc03
100µs/div
5V/div
0
PWRON
BUCK1
BUCK2
OUT1
OUT2
2V/div
0
2V/div
0
5V/div
0
5V/div
0
10mA LOAD ON ALL FOUR OUTPUTS
RESET WAVEFORMS
MAX8621 toc04
20ms/div
2V/div
0
PWRON
OUT1
RESET
2V/div
0
2V/div
0
LOAD = 1mA