Rainbow Electronics MAX1676 - Manual (Page 6)

10 µs/div
LINE-TRANSIENT RESPONSE
MAX1674 TOC15
V IN
2V TO 3V
1V/div
V OUT
AC COUPLED
100mV/div
I
LOAD
100mA
5 µs/div
LOAD-TRANSIENT RESPONSE
MAX1674 TOC16
I OUT
200mA/div
V OUT
50mV/div
AC
COUPLED
V IN = 2.4V
V OUT = 3.3V
500 µs/div
EXITING SHUTDOWN
MAX1674 TOC17
V SHDN
2V/div
V OUT
2V/div
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
6 _______________________________________________________________________________________
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.)
Pin Description
PIN
NAME FUNCTION MAX1674
MAX1675
MAX1676
1 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.
2 2 LBI Low-Battery Comparator Input. Internally set to trip at +1.30V.
3 3 LBO
Open-Drain Low-Battery Comparator Output. Connect LBO to OUT
through a 100k
Ω resistor. Output is low when V
LBI is <1.3V. LBO is
high impedance during shutdown.
— 4 CLSEL
Current-Limit Select Input. CLSEL = OUT sets the current limit to 1A.
CLSEL = GND sets the current limit to 0.5A.
4 5 REF 1.3V Reference Voltage. Bypass with a 0.1µF capacitor.
5 6 SHDN
Shutdown Input. Drive high (>80% of V OUT ) for operating mode.
Drive low (<20% of V OUT ) for shutdown mode. Connect to OUT for
normal operation.
— 7 BATT
Battery Input and Damping Switch Connection. If damping switch is
unused, leave BATT unconnected.
6 8 GND Ground
7 9 LX N-Channel and P-Channel Power MOSFET Drain
8 10 OUT Power Output. OUT provides bootstrap power to the IC.
Dual-Mode is a trademark of Maxim Integrated Products.