Rainbow Electronics MAX1676 - Manual

General Description
The MAX1674/MAX1675/MAX1676 compact, high-effi-
ciency, 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 V OUT , where
V OUT can be set from 2V to 5.5V. Start-up is guaran-
teed 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 volt-
ages using two external resistors.
All three devices have a 0.3
Ω 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 cur-
rent 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
____________________________Features
♦ 94% Efficient at 200mA Output Current
♦ 16µA Quiescent Supply Current
♦ Internal Synchronous Rectifier (no external diode)
♦ 0.1µA Logic-Controlled Shutdown
♦ LBI/LBO Low-Battery Detector
♦ Selectable Current Limit for Reduced Ripple
♦ Low-Noise, Anti-Ringing Feature (MAX1676)
♦ 8-Pin and 10-Pin µMAX Packages
♦ Preassembled Evaluation Kit (MAX1676EVKIT)
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
________________________________________________________________ Maxim Integrated Products 1
GND LBO
SHDN REF
1
2
8
7
OUT
LX LBI
FB
MAX1674
MAX1675
µMAX
TOP VIEW
3
4
6
5
1
2
3
4
5
10
9
8
7
6
OUT
LX
GND
BATT CLSEL
LBO
LBI
FB
MAX1676
µMAX
SHDN REF
MAX1674
MAX1675
INPUT
0.7V TO V OUT
SHDN LX
LBO
OUT
LBI
0.1 µF
LOW-BATTERY
DETECT OUT
OFF
ON
REF GND FB
OUTPUT
3.3V, 5V, OR
ADJ (2V TO 5.5V)
UP TO 300mA
LOW-BATTERY
DETECT IN
PART
MAX1674EUA -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
8 µMAX
_______________Ordering Information
MAX1675EUA -40°C to +85°C 8 µMAX
MAX1676EUB -40°C to +85°C 10 µMAX
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Typical Operating Circuit
Pin Configurations
19-1360; Rev 3; 3/00
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.