High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
MAX1674/MAX1675/MAX1676
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.)
LINE-TRANSIENT RESPONSE
MAX1674 TOC15
LOAD-TRANSIENT RESPONSE
MAX1674 TOC16
EXITING SHUTDOWN
MAX1674 TOC17
V
IN
2V TO 3V
1V/div
V
IN
= 2.4V
V
OUT
= 3.3V
I
OUT
200mA/div
V
OUT
2V/div
I
LOAD
100mA
10µs/div
V
OUT
AC COUPLED
100mV/div
V
OUT
50mV/div
AC
COUPLED
5µs/div
500µs/div
V
SHDN
2V/div
Pin Description
PIN
MAX1674
MAX1675
1
MAX1676
NAME
FUNCTION
1
FB
Dual-Mode™ Feedback Input. Connect to GND for +5.0V output.
Connect to OUT for +3.3V output. Use a resistor network to set the
output voltage from +2.0V to +5.5V.
Low-Battery Comparator Input. Internally set to trip at +1.30V.
Open-Drain Low-Battery Comparator Output. Output is low when
V
LBI
is <1.3V.
LBO
is high impedance during shutdown.
Current-Limit Select Input. CLSEL = OUT sets the current limit to 1A.
CLSEL = GND sets the current limit to 0.5A.
1.3V Reference Voltage. Bypass with a 0.1µF capacitor.
Shutdown Input. High = operating, low = shutdown.
Battery Input and Damping Switch Connection. If damping switch is
unused, leave BATT unconnected.
Ground
N-Channel and P-Channel Power MOSFET Drain
Power Output. OUT provides bootstrap power to the IC.
2
3
—
4
5
—
6
7
8
2
3
4
5
6
7
8
9
10
LBI
LBO
CLSEL
REF
SHDN
BATT
GND
LX
OUT
Dual-Mode is a trademark of Maxim Integrated Products.
6
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
