MAX1572
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with
RESET
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= 3.6V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX
EN_ Logic Input Low 0.4 V
EN_ Logic Input Current 1µA
RESET Threshold Percent of nominal, measured at OUT 87 93 %
RESET Timer Delay Time From V
OUT
> 90% to RESET = HI 170 230 ms
RESET Output Low Level I
SINK
= 1mA 0.2 V
RESET Internal Pullup Resistance to OUT 9 20 kΩ
Note 2: Guaranteed by design, not production tested.
Note 3: Specifications to -40°C are guaranteed by design and not production tested.
100
90
40
11000
EFFICIENCY vs. LOAD CURRENT
WITH 2.5V OUTPUT
60
50
80
70
MAX1572toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
10 100
V
IN
= 2.6V
V
IN
= 3.6V
V
IN
= 5V
100
90
40
11000
EFFICIENCY vs. LOAD CURRENT
WITH 1.8V OUTPUT
60
50
80
70
MAX1572toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
10 100
V
IN
= 2.6V
V
IN
= 3.6V
V
IN
= 5V
100
90
40
11000
EFFICIENCY vs. LOAD CURRENT
WITH 1.5V OUTPUT
60
50
80
70
MAX1572toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
10 100
V
IN
= 2.6V
V
IN
= 3.6V
V
IN
= 5V
100
90
40
11000
EFFICIENCY vs. LOAD CURRENT
vs. MODE
60
50
80
70
MAX1572toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
10 100
FORCED-
PWM MODE
PULSE-
SKIP MODE
PULSE-
GROUP MODE
1.58
1.56
1.40
0 800
OUTPUT VOLTAGE
vs. LOAD CURRENT
1.48
1.46
1.44
1.42
1.54
1.50
1.52
MAX1572toc05
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
200 400 600
T
A
= +85
°
C
T
A
= +25
°
C
T
A
= -40
°
C
1.55
1.45
2.5 5.5
OUTPUT VOLTAGE vs. INPUT VOLTAGE
WITH 100mA LOAD
1.49
1.47
1.53
1.51
MAX1572toc06
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.0 3.5 4.5 5.04.0
T
A
= +85
°
C
T
A
= +25
°
C
T
A
= -40
°
C
Typical Operating Characteristics
(V
BATT
= 3.6V, V
OUT
= 1.5V, EN1 = GND, EN2 = BATT, T
A
= +25°C, unless otherwise noted.)
