19-1802; Rev 2; 4/05
EVAALVUAAILTAIOBNLEKIT
High-Efficiency Step-Up Converters with
Reverse Battery Protection
General Description
The MAX1832–MAX1835 are high-efficiency step-up
converters with complete reverse battery protection that
protects the device and the load when the battery is
reversed. They feature a built-in synchronous rectifier,
which allows for over 90% efficiency and reduces size
and cost by eliminating the need for an external
Schottky diode.
These step-up converters operate from a +1.5V to +5.5V
input voltage range and deliver up to 150mA of load cur-
rent. The MAX1833EUT/MAX1835EUT (SOT devices)
have a fixed 3.3V output voltage. The MAX1833ETT30
(TDFN device) has a fixed 3.0V output voltage. The
MAX1832/MAX1834 have adjustable outputs from +2V to
+5.5V. In shutdown, the MAX1832/MAX1833 connect the
battery input to the voltage output, allowing the input bat-
tery to be used as a backup or real-time clock supply
when the converter is off (see Selector Guide).
MAX183_EUT devices are available in a miniature 6-pin
SOT23 package. The MAX1833ETT30 is available in a
3mm ✕ 3mm thin DFN package. The MAX1832EVKIT is
available to speed designs.
________________________Applications
Medical Diagnostic Equipment
Pagers
Hand-Held Instruments
Remote Wireless Transmitters
Digital Cameras
Cordless Phones
Battery Backup
PC Cards
Local 3.3V or 5V Supply
Pin Configurations
TOP VIEW
SHDN 1
6 FB (RST)
6
5
4
MAX1832
BATT 2 MAX1834 5 OUT
(MAX1833EUT)
(MAX1835)
GND 3
4 LX
SOT23
MAX1833ETT
1
2
3
TDFN
3mm ✕ 3mm
Features
♦ Reverse Battery Protection for DC-DC Converter
and Load
♦ Up to 90% Efficiency
♦ No External Diode or FETs Needed
♦ Internal Synchronous Rectifier
♦ 4µA Quiescent Current
♦ <1µA Shutdown Supply Current
♦ +1.5V to +5.5V Input Voltage Range
♦ Accurate SHDN Threshold for Low-Battery Cutoff
♦ BATT Connected to OUT in Shutdown for Backup
Power (MAX1832/MAX1833)
♦ RST Output (MAX1833/MAX1835)
♦ Fixed 3.3V/3.0V Output Voltage
♦ Adjustable Output Voltage (MAX1832/MAX1834)
♦ Up to 150mA Output Current
♦ Tiny 6-Pin SOT23 Package
♦ Tiny 6-Pin Thin QFN Package (MAX1833ETT30)
Ordering Information
PART
MAX1832EUT-T
MAX1833EUT-T
MAX1833ETT30-T
MAX1834EUT-T
MAX1835EUT-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN -
PA C K A G E
6 SOT23-6
6 SOT23-6
6 TDFN-6
(T633-1)
6 SOT23-6
6 SOT23-6
TOP
MARK
AAOT
AAOU
ABX
AAOV
AAOW
PART
MAX1832EUT-T
MAX1833EUT-T
MAX1833ETT30-T
MAX1834EUT-T
MAX1835EUT-T
Selector Guide
OUTPUT
VOLTAGE
Adjustable
Fixed 3.3V
Fixed 3.0V
Adjustable
Fixed 3.3V
OUTPUT VOLTAGE
IN SHUTDOWN
VBATT
VBATT
VBATT
VBATT - 0.7V
VBATT - 0.7V
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.