Typical operating characteristics (continued) – Rainbow Electronics MAX1643 User Manual
Page 5
MAX1642/MAX1643
High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
_______________________________________________________________________________________
5
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 4, V
BATT
= 1.2V, R1 + R2 = 1M
Ω
, T
A
= +25°C, unless otherwise noted.)
B
LOAD-TRANSIENT RESPONSE
MAX1642/43 TOC10
A
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
0
0.8
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX1642/43 TOC08b
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
1.4
25
30
5
15
10
20
0.9
1.3
1.2
1.5
1.6
35
1.0
1.1
L1 = 100
µ
H
SUMIDA CD54-101
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 2.4V
0
0.8
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX1642/43 TOC08c
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
1.4
14
12
18
16
4
2
6
10
8
0.9
1.3
1.2
1.5
1.6
20
1.0
1.1
L1 = 150
µ
H
TDK NLC565050T-151K
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 2.4V
C
SWITCHING WAVEFORMS
MAX1642/43 TOC09
B
A
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
B
LINE-TRANSIENT RESPONSE
MAX1642/43 TOC11
A
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
B
C
SHUTDOWN RESPONSE AND
INDUCTOR CURRENT
MAX1642/43 TOC12
A
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