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| MAX1572 Datasheet, PDF (5/11 Pages) Maxim Integrated Products – 800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET | |||
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800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with RESET
Typical Operating Characteristics (continued)
(VBATT = 3.6V, VOUT = 1.5V, EN1 = GND, EN2 = BATT, TA = +25°C, unless otherwise noted.)
INPUT CURRENT vs. INPUT VOLTAGE
WITH NO LOAD
60
50
40
30
20
10
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
LIGHT-LOAD SWITCHING WAVEFORMS
MAX1572 toc09
VLX
2V/div
HEAVY-LOAD SWITCHING WAVEFORMS
MAX1572 toc08
VLX
2V/div
VOUT
RIPPLE
IL
10mV/div
500mA/div
200ns/div
ILOAD = 500mA
SOFT-START/SHUTDOWN WAVEFORMS
MAX1572 toc10
VEN2
2V/div
VOUT
RIPPLE
IL
20mV/div
ILOAD = 20mA
2µs/div
500mA/div
VOUT
1V/div
IIN
100mA/div
200µs/div
RESET WAVEFORM
MAX1572 toc11
VEN2
2V/div
VOUT
1V/div
LOAD TRANSIENT, FORCED-PWM MODE
MAX1572 toc12
VOUT
100mV/div
VRESET
IIN
100ms/div
1V/div
100mA/div
ILOAD
ILOAD = 20mA TO 550mA
4µs/div
500mA/div
_______________________________________________________________________________________ 5
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