Rainbow Electronics MAX1676 - Manual (Page 5)

MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
_______________________________________________________________________________________ 5
0
40
20
100
80
60
140
120
160
0 1.5 2.0 0.5 1.0 2.5 3.0 3.5 4.0 4.5
NO-LOAD BATTERY CURRENT
vs. INPUT BATTERY VOLTAGE
MAX1674toc07
INPUT BATTERY VOLTAGE (V)
INPUT BATTERY CURRENT (
µ
A)
I LIMIT = 1A, 5.0V
I LIMIT = 0.5A, 5.0V
I LIMIT = 0.5A, 3.3V
I LIMIT = 1A, 3.3V
1.8
0
0.01 1 10 0.1 100
START-UP VOLTAGE
vs. LOAD CURRENT
0.2
0.4
MAX1674toc08
LOAD CURRENT (mA)
START-UP VOLTAGE (V)
0.8
0.6
1.0
1.2
1.4
1.6
WITHOUT DIODE
WITH 1N5817
-1.0
-0.6
-0.8
-0.2
-0.4
0.2
0
0.4
0.8
0.6
1.0
1 2.0 2.5 3.0 1.5 3.5 4.0 4.5 5.0 5.5
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX167toc09
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (
µ
A)
0
0.4
0.2
0.8
0.6
1.2
1.0
1.4
0 1.0 1.5 0.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
SHUTDOWN THRESHOLD
vs. SUPPLY VOLTAGE
MAX1674TOC10
SUPPLY VOLTAGE (V)
SHUTDOWN THRESHOLD (V)
0
200
100
500
300
400
800
700
600
900
1.0 2.0 1.5 2.5 3.0 3.5 4.0 4.5
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE (V OUT = 5V)
MAX1674toc11
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
1A CURRENT LIMIT
0.5A CURRENT LIMIT
0
200
100
400
300
600
500
800
700
1.0 1.4 1.6 1.2 1.8 2.0 2.2 2.4 2.6 2.8 3.0
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE (V OUT = 3.3V)
MAX1674toc12
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
0.5A CURRENT LIMIT
1A CURRENT LIMIT
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.)
1 µs/div
HEAVY-LOAD SWITCHING WAVEFORMS
MAX1674 TOC13
V LX
5V/div
I
LX
0.5A/div
V
OUT
AC COUPLED
100mV/div
V IN = 2.4V
V OUT = 5.0V
0
0.4
0.2
0.8
0.6
1.0
1.2
2.0 3.0 3.5 2.5 4.0 4.5 5.0
LX CURRENT LIMIT
vs. OUTPUT VOLTAGE
MAX1674toc14
OUTPUT VOLTAGE (V)
I LIM
(A)
MAX1674, MAX1676 (CLSEL = OUT)
MAX1675, MAX1676 (CLSEL = GND)
0
0.15
0.10
0.05
0.25
0.20
0.35
0.30
0.45
0.40
-60 -20 -40 0 20 40 60 80 100
SWITCH RESISTANCE vs. TEMPERATURE
MAX1674toc13.5
TEMPERATURE (°C)
RESISTANCE (
Ω
)
P-CHANNEL
N-CHANNEL