MAX1642 Datasheet, PDF (5/12 Pages) Maxim Integrated Products – High-Efficiency, Step-Up DC-DC Converters for 1V Inputs

High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 4, V_BATT = 1.2V, R1 + R2 = 1MΩ, T_A = +25°C, unless otherwise noted.)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
35
30
V_OUT = 2.4V
25
20
15
V_OUT = 3.3V _{VOUT = 5V}
10
5 ^{L1 = 100µH}
SUMIDA CD54-101
0
0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
20
18 ^{VOUT = 2.4V}
16
14
12
V_OUT = 3.3V
10
8
V_OUT = 5V
6
4
L1 = 150µH
2 TDK NLC565050T-151K
0
0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6
INPUT VOLTAGE (V)
SWITCHING WAVEFORMS
A
B
C
10ms/div
V_OUT = 3.3V, V_IN = 1.2V, I_OUT = 12mA
A: LX, 2V/div, L1 = TDK NLC565050T-151K
B: OUT, 20mV/div, 3.3V DC OFFSET
C: INDUCTOR CURRENT, 100mA/div
LOAD-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE
SHUTDOWN RESPONSE AND
INDUCTOR CURRENT
A
B
400µs/div
V_OUT = 3.3V, V_BATT = 1.2V
A: OUT, 20mV/div, 3.3V DC OFFSET
B: LOAD, 2mA to 20mA, 10mA/div
A
B
400µs/div
V_OUT = 3.3V, LOAD = 15mA
A: OUT, 50mV/div, 3.3V DC OFFSET
B: V_BATT, 1V to 1.5V, 500mV/div
A
B
C
10ms/div
V_OUT = 3.3V, V_BATT = 1.2V, I_OUT = 5mA
A: OUT, 1V/div
B: INDUCTOR CURRENT, 200mA/div
C: SHDN, 2V/div
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