AVAILABLE
EVALUATION KIT AVAILABLE
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC ...
AVAILABLE
EVALUATION KIT AVAILABLE
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters
General Description
The MAX1674/MAX1675/MAX1676 compact, high-efficiency, step-up DC-DC converters fit in small µMAX packages. They feature a built-in synchronous rectifier, which improves efficiency and reduces size and cost by eliminating the need for an external Schottky diode. Quiescent supply current is only 16µA.
The input
voltage ranges from 0.7V to VOUT, where VOUT can be set from 2V to 5.5V. Start-up is guaranteed from 1.1V inputs. The MAX1674/MAX1675/ MAX1676 have a preset, pin-selectable output for 5V or 3.3V. The outputs can also be adjusted to other
voltages using two external resistors.
All three devices have a 0.3Ω N-channel
MOSFET power switch. The MAX1674 has a 1A current limit. The MAX1675 has a 0.5A current limit, which permits the use of a smaller inductor. The MAX1676 comes in a 10-pin µMAX package and features an adjustable current limit and circuitry to reduce inductor ringing.
________________________Applications
Pagers
Wireless Phones
Medical Devices
Hand-Held Computers
PDAs
RF Tags
1 to 3-Cell Hand-Held Devices
Functional Diagrams Typical Operating Circuit
INPUT 0.7V TO VOUT
ON OFF
SHDN
LX
MAX1674 OUT MAX1675
OUTPUT 3.3V, 5V, OR ADJ (2V TO 5.5V) UP TO 300mA
LOW-BATTERY DETECT IN
LBI LBO REF FB GND
LOW-BATTERY DETECT OUT
Pin Configuration0s.1µaFppear at end of data sheet. Functional Diagrams continued at end of d...