MAX1678 Maxim, MAX1678 Datasheet
MAX1678
Manufacturer Part Number
MAX1678
Description
1-Cell to 2-Cell / Low-Noise / High-Efficiency / Step-Up DC-DC Converter
Manufacturer
Maxim
Datasheet
1.MAX1678.pdf
(12 pages)
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MAXIM/美信
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20 000
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MAX
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The MAX1678 is a high-efficiency, low-voltage, syn-
chronous-rectified, step-up DC-DC converter intended
for use in devices powered by 1 to 3-cell alkaline,
NiMH, or NiCd batteries or a 1-cell lithium battery. It
guarantees a 0.87V start-up voltage and features a low
37µA quiescent supply current.
The device includes a 1Ω, N-channel MOSFET power
switch, a synchronous rectifier that acts as the catch
diode, a reference, pulse-frequency-modulation (PFM)
control circuitry, and circuitry to reduce inductor ring-
ing—all in an ultra-small, 1.1mm-high µMAX package.
The output voltage is preset to 3.3V or can be adjusted
from +2V to +5.5V using only two resistors. Efficiencies
up to 90% are achieved for loads up to 50mA. The
device also features an independent undervoltage
comparator (PFI/PFO) and a logic-controlled 2µA shut-
down mode.
19-1381; Rev 0; 7/98
Dual Mode is a trademark of Maxim Integrated Products.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
INPUT
0.87V TO V
DETECTOR INPUT
Pagers
Remote Controls
Pointing Devices
Personal Medical Monitors
Single-Cell Battery-Powered Devices
LOW-BATTERY
OUT
ON
OFF
High-Efficiency, Step-Up DC-DC Converter
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
LX
BATT
SHDN
PFI
General Description
GND
MAX1678
FB
OUT
PFO
Applications
LOW-BATTERY
DETECTOR OUTPUT
OUTPUT
3.3V
1-Cell to 2-Cell, Low-Noise,
Note: To order these devices shipped in tape-and-reel, add a -T
to the part number.
MAX1678EUA
0.87V Guaranteed Start-Up
Up to 90% Efficiency
Built-In Synchronous Rectifier (no external diode)
Ultra-Small µMAX Package, 1.1mm High
37µA Quiescent Current (85µA from 1.5V battery)
2µA Logic-Controlled Shutdown
Power-Fail Detector
Dual Mode™ Output: Fixed 3.3V
45mA Output Current at 3.3V for 1-Cell Input
90mA Output Current at 3.3V for 2-Cell Input
Inductor-Damping Switch Suppresses EMI
PART
TOP VIEW
SHDN
BATT
PFO
PFI
-40°C to +85°C
TEMP. RANGE
3
4
1
2
Ordering Information
Adjustable 2V to 5.5V
MAX1678
Pin Configuration
MAX
8 µMAX
8
7
6
5
PIN-PACKAGE
OUT
LX
GND
FB
Features
1
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