Rainbow Electronics MAX8621Z - Manual (Page 6)

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 (
µ
A)
5.0 4.5 4.0 3.5 3.0
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
50 µs/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
100 µs/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