MAX1676EUB Datasheet Download

Part No.:
MAX1676EUB
Download:
Download Datasheet
Description:
[High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters]
File Size:
522 K
Page:
12 Pages
Logo:
Manufacturer:
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
PCB Prototype
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19-1360; Rev 3; 3/00
UAL
IT MAN
TION K
A
SHEET
EVALU
S DATA
W
FOLLO
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
____________________________Features
o
94% Efficient at 200mA Output Current
o
16µA Quiescent Supply Current
o
Internal Synchronous Rectifier (no external diode)
o
0.1µA Logic-Controlled Shutdown
o
LBI/LBO Low-Battery Detector
o
Selectable Current Limit for Reduced Ripple
o
Low-Noise, Anti-Ringing Feature (MAX1676)
o
8-Pin and 10-Pin µMAX Packages
o
Preassembled Evaluation Kit (MAX1676EVKIT)
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 0.3Ω 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 cur-
rent limit and circuitry to reduce inductor ringing.
MAX1674/MAX1675/MAX1676
_______________Ordering Information
PART
MAX1674EUA
MAX1675EUA
MAX1676EUB
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 µMAX
10 µMAX
________________________Applications
Pagers
Wireless Phones
Medical Devices
Hand-Held Computers
PDAs
RF Tags
1 to 3-Cell Hand-Held Devices
Pin Configurations
TOP VIEW
Typical Operating Circuit
FB
1
INPUT
0.7V TO V
OUT
LBI
LBO
2
3
8
OUT
LX
GND
SHDN
MAX1674
MAX1675
7
6
5
REF
4
ON
OFF
SHDN
LX
OUTPUT
3.3V, 5V, OR
ADJ (2V TO 5.5V)
UP TO 300mA
µMAX
MAX1674
OUT
MAX1675
FB
1
LBI
2
LOW-BATTERY
DETECT IN
LBI
REF
0.1µF
FB
LBO
GND
LOW-BATTERY
DETECT OUT
LBO
3
CLSEL
4
REF
5
10
OUT
9
LX
GND
BATT
SHDN
MAX1676
8
7
6
µMAX
________________________________________________________________
Maxim Integrated Products
1
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.