MAX1674 Datasheet, PDF (5/12 Pages) Maxim Integrated Products – High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters

High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
Typical Operating Characteristics (continued)
(L = 22µH, C_IN = 47µF, C_OUT = 47µF 0.1µF, C_REF = 0.1µF, T_A = +25°C, unless otherwise noted.)
NO-LOAD BATTERY CURRENT
vs. INPUT BATTERY VOLTAGE
160
140
120
I_LIMIT = 1A, 5.0V
100
80
I_LIMIT = 0.5A, 5.0V
60
40 _{ILIMIT = 0.5A, 3.3V}
20
0
0
I_LIMIT = 1A, 3.3V
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
INPUT BATTERY VOLTAGE (V)
SHUTDOWN THRESHOLD
vs. SUPPLY VOLTAGE
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
START-UP VOLTAGE
vs. LOAD CURRENT
1.8
1.6
1.4
1.2 WITHOUT DIODE
1.0
0.8
0.6 WITH 1N5817
0.4
0.2
0
0.01
0.1
1
10
100
LOAD CURRENT (mA)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE (V_OUT = 5V)
900
800
700
1A CURRENT LIMIT
600
500
400
300
200
0.5A CURRENT LIMIT
100
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
INPUT VOLTAGE (V)
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
1 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE (V_OUT = 3.3V)
800
700
600
1A CURRENT LIMIT
500
400
300
200
0.5A CURRENT LIMIT
100
0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
INPUT VOLTAGE (V)
HEAVY-LOAD SWITCHING WAVEFORMS
MAX1674 TOC13
V_LX
5V/div
I_LX
0.5A/div
V_IN = 2.4V
V_OUT = 5.0V
1µs/div
V_OUT
AC COUPLED
100mV/div
SWITCH RESISTANCE vs. TEMPERATURE
0.45
0.40
P-CHANNEL
0.35
0.30
0.25
N-CHANNEL
0.20
0.15
0.10
0.05
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
LX CURRENT LIMIT
vs. OUTPUT VOLTAGE
1.2
MAX1674, MAX1676 (CLSEL = OUT)
1.0
0.8
0.6
0.4
MAX1675, MAX1676 (CLSEL = GND)
0.2
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT VOLTAGE (V)
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