Rainbow Electronics MAX1835 - Manual

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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 current. The MAX1833/MAX1835 have a fixed
+3.3V output, and 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 battery to be used as
a backup or real-time clock supply when the converter
is off (see Selector Guide).
The MAX1832–MAX1835 are available in a miniature 6-
pin SOT23 package. The MAX1832EVKIT is available to
shorten the design cycle.
________________________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
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 Output Voltage (MAX1833/MAX1835)
♦ Adjustable Output Voltage (MAX1832/MAX1834)
♦ Up to 150mA Output Current
♦ Tiny 6-Pin SOT23 Package
MAX1832–MAX1835
High-Efficiency Step-Up Converters with
Reverse Battery Protection in SOT23-6
________________________________________________________________ Maxim Integrated Products 1
BATT
LX GND
1 6 FB
5 OUT
SHDN
MAX1832
MAX1834
SOT23-6
TOP VIEW
2
3 4
BATT
LX GND
1 6 RST
5 OUT
SHDN
MAX1833
MAX1835
SOT23-6
2
3 4
Pin Configurations
19-1802; Rev 0; 10/00
EVALUATION KIT AVAILABLE
Ordering Information
PART T EM P. R A N G E
PIN-
PACKAGE TOP
MARK
MAX1832EUT-T -40 °C to +85°C 6 SOT23-6 AAOT
MAX1833EUT-T -40 °C to +85°C 6 SOT23-6 AAOU
MAX1834EUT-T -40 °C to +85°C 6 SOT23-6 AAOV
MAX1835EUT-T -40 °C to +85°C 6 SOT23-6 AAOW
Selector Guide
PART
OUTPUT
VOLTAGE
OUTPUT VOLTAGE
IN SHUTDOWN
MAX1832EUT-T Adjustable V BATT
MAX1833EUT-T Fixed 3.3V V BATT
MAX1834EUT-T Adjustable V
BATT
- 0.7V
MAX1835EUT-T Fixed 3.3V V BATT - 0.7V
Note: Requires special solder temperature profile described in
the Absolute Maximum Ratings.