Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
Typical Operating Characteristics (continued)
(L = 22µH, C = 47µF, C
= 47µF, T = +25°C, unless otherwise noted.)
A
IN
OUT
MAX1795
MAXIMUM OUTPUT CURRENT
vs. BATT INPUT VOLTAGE
LOW-BATTERY INPUT THRESHOLD
vs. TEMPERATURE
LOW-BATTERY INPUT THRESHOLD
vs. INPUT BATT VOLTAGE
0.950
0.925
0.900
0.875
0.850
0.825
0.800
0.950
0.925
0.900
0.875
0.850
0.825
0.800
250
200
150
100
50
V
= +3.6V
BATT
V
= +3.3V
OUT
INCREASING V
DECREASING V
LBI
INCREASING V
LBI
V
= +5.0V
OUT
LBI
DECREASING V
LBI
0
-40
-15
10
35
60
85
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
BATT VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATT VOLTAGE (V)
TEMPERATURE (°C)
MAX1797
MAX1796
MAXIMUM OUTPUT CURRENT
vs. BATT INPUT VOLTAGE
MAXIMUM OUTPUT CURRENT
vs. BATT INPUT VOLTAGE
1000
500
400
300
200
100
0
800
600
400
200
0
V
= +3.3V
OUT
V
= +3.3V
OUT
V
OUT
= +5.0V
V
= +5.0V
OUT
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATT VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATT VOLTAGE (V)
OUT LEAKAGE CURRENT
vs. OUTPUT VOLTAGE
HEAVY-LOAD SWITCHING WAVEFORMS
MAX1795/96/97 toc16
2.0
1.6
1.2
0.8
0.4
0
SHDN = BATT
V
V
V
= +5V
LX
5V/div
OUT
BATT
= +2.4V
I
INDUCTOR
500mA/div
V
OUT
(AC-COUPLED)
OUT BIASED WITH
EXTERNAL VOLTAGE
SOURCE
100mV/div
4.00µs/div
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
OUTPUT VOLTAGE (V)
V
V
= +3.6V
IN
= +5.0V
OUT
LOAD
I
= 400mA
6
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
