MAX856 Maxim, MAX856 Datasheet
MAX856
Manufacturer Part Number
MAX856
Description
3.3V/5V or Adjustable-Output / Step-Up DC-DC Converters
Manufacturer
Maxim
Datasheet
1.MAX856.pdf
(12 pages)
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The MAX856–MAX859 are high-efficiency, CMOS, step-
up, DC-DC switching regulators for small, low input volt-
age or battery-powered systems. The MAX856/MAX858
accept a positive input voltage between 0.8V and V
and convert it to a higher, pin-selectable output voltage of
3.3V or 5V. The MAX857/MAX859 adjustable versions
accept 0.8V to 6.0V input voltages and generate higher
adjustable output voltages in the 2.7V to 6.0V range.
Typical efficiencies are greater than 85%. Typical quies-
cent supply current is 25µA (1µA in shutdown).
The MAX856–MAX859 combine ultra-low quiescent supply
current and high efficiency to give maximum battery life. An
internal MOSFET power transistor permits high switching
frequencies. This benefit, combined with internally set peak
inductor current limits, permits the use of small, low-cost
inductors. The MAX856/MAX857 have a 500mA peak
inductor current limit. The MAX858/MAX859 have a 125mA
peak inductor current limit.
________________________Applications
19-0211; Rev 4; 5/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
__________Typical Operating Circuit
_______________General Description
LOW-BATTERY
3V/5V SELECT
DETECTOR
0.8V TO V
3.3V to 5V Step-Up Conversion
Palmtop Computers
Portable Data-Collection Equipment
Personal Data Communicators/Computers
Medical Instrumentation
2-Cell & 3-Cell Battery-Operated Equipment
Glucose Meters
ON/OFF
INPUT
INPUT
OUT
SHDN
3/5
LBI
REF
________________________________________________________________ Maxim Integrated Products
MAX856
GND
OUT
LBO
LX
1N5817
47 H
LOW-BATTERY
DETECTOR OUTPUT
3.3V/5V or Adjustable-Output,
3.3V AT 125mA
5V AT 100mA
OUTPUT
OR
68 F
Step-Up DC-DC Converters
OUT
____________________________Features
Ordering Information continued at end of data sheet.
* Dice are tested at T
†
__________________Pin Configuration
______________Ordering Information
MAX856CSA
MAX856CUA
MAX856C/D
MAX856ESA
MAX856MJA
MAX857CSA
MAX857CUA
MAX857C/D
MAX857ESA
MAX857MJA
Contact factory for availability.
0.8V to 6.0V Input Supply Voltage
0.8V Typ Start-Up Supply Voltage
85% Efficiency at 100mA
25µA Quiescent Current
1µA Shutdown Mode
125mA and 500mA Switch-Current Limits Permit
Use of Low-Cost Inductors
Up to 500kHz Switching Frequency
±1.5% Reference Tolerance Over Temperature
Low-Battery Detector (LBI/LBO)
8-Pin SO and µMAX Packages
TOP VIEW
PART
SHDN
SHDN
LBO
REF
LBO
REF
3/5
FB
A
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-55°C to +125°C
1
2
3
4
1
2
3
4
TEMP. RANGE
= +25°C only.
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
SO/ MAX
SO/ MAX
MAX856
MAX858
MAX857
MAX859
8
7
6
5
8
7
6
5
PIN-PACKAGE
8 SO
8 µMAX
Dice*
8 SO
8 CERDIP
8 SO
8 µMAX
Dice*
8 SO
8 CERDIP
LX
GND
OUT
LBI
LX
GND
OUT
LBI
†
†
1
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