MAX1674 Datasheet, PDF (6/12 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.)
LINE-TRANSIENT RESPONSE
MAX1674 TOC15
V_IN
2V TO 3V
1V/div
LOAD-TRANSIENT RESPONSE
MAX1674 TOC16
V_IN = 2.4V
V_OUT = 3.3V
I_OUT
200mA/div
EXITING SHUTDOWN
MAX1674 TOC17
V_OUT
2V/div
I_LOAD
100mA
10µs/div
V_OUT
AC COUPLED
100mV/div
5µs/div
V_OUT
50mV/div
AC
COUPLED
500µs/div
V_SHDN
2V/div
PIN
MAX1674
MAX1675
MAX1676
1
1
2
2
3
3
NAME
FB
LBI
LBO
—
4
CLSEL
4
5
REF
5
6
SHDN
—
7
BATT
6
8
GND
7
9
LX
8
10
OUT
Dual-Mode is a trademark of Maxim Integrated Products.
Pin Description
FUNCTION
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. Connect LBO to OUT
through a 100kΩ resistor. 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. Drive high (>80% of V_OUT) for operating mode.
Drive low (<20% of V_OUT) for shutdown mode. Connect to OUT for
normal operation.
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.
6 _______________________________________________________________________________________