MAX1572 Maxim Integrated Products, MAX1572 Datasheet - Page 5

• Manufacturer Part Number: MAX1572
• Description: PWM DC-to-DC Step-Down Converter
• Manufacturer: Maxim Integrated Products

(V
BATT
= 3.6V, V
RIPPLE
V
RESET
V
V
V
V
OUT
OUT
EN2
LX
I
60
50
40
30
20
10
IN
I
L
0
OUT
2.0
LIGHT-LOAD SWITCHING WAVEFORMS
INPUT CURRENT vs. INPUT VOLTAGE
_______________________________________________________________________________________
= 1.5V, EN1 = GND, EN2 = BATT, T
2.5
RESET WAVEFORM
3.0
INPUT VOLTAGE (V)
WITH NO LOAD
100ms/div
3.5
2µs/div
4.0
Step-Down Converter with RESET
I
LOAD
4.5
= 20mA
MAX1572 toc09
MAX1572 toc11
5.0
Typical Operating Characteristics (continued)
5.5
800mA, 2MHz, PWM DC-to-DC
20mV/div
1V/div
1V/div
500mA/div
100mA/div
2V/div
2V/div
A
= +25°C, unless otherwise noted.)
RIPPLE
I
V
V
V
LOAD
V
OUT
OUT
V
EN2
OUT
I
LX
IN
I
L
LOAD TRANSIENT, FORCED-PWM MODE
HEAVY-LOAD SWITCHING WAVEFORMS
SOFT-START/SHUTDOWN WAVEFORMS
200ns/div
200µs/div
4µs/div
I
LOAD
= 20mA TO 550mA
I
LOAD
= 500mA
MAX1572 toc10
MAX1572 toc12
MAX1572 toc08
www.DataSheet4U.com
1V/div
10mV/div
100mA/div
500mA/div
500mA/div
2V/div
100mV/div
2V/div
5