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MAX1835 Datasheet

  • MAX1835

  • High- Efficiency Step-Up Converters with Reverse Battery Pro...

  • Maxim   Maxim

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19-1802; Rev 0; 10/00
VAILABLE
TION KIT A
EVALUA
High-Efficiency Step-Up Converters with
Reverse Battery Protection in SOT23-6
General Description
The MAX1832鈥揗AX1835 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鈥揗AX1835 are available in a miniature 6-
pin SOT23 package. The MAX1832EVKIT is available to
shorten the design cycle.
Features
o
Reverse Battery Protection for DC-DC Converter
and Load
o
Up to 90% Efficiency
o
No External Diode or FETs Needed
o
Internal Synchronous Rectifier
o
4碌A(chǔ) Quiescent Current
o
<1碌A(chǔ) Shutdown Supply Current
o
+1.5V to +5.5V Input Voltage Range
o
Accurate
SHDN
Threshold for Low-Battery Cutoff
o
BATT Connected to OUT in Shutdown for Backup
Power (MAX1832/MAX1833)
o
RST
Output (MAX1833/MAX1835)
o
Fixed +3.3V Output Voltage (MAX1833/MAX1835)
o
Adjustable Output Voltage (MAX1832/MAX1834)
o
Up to 150mA Output Current
o
Tiny 6-Pin SOT23 Package
MAX1832鈥揗AX1835
________________________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
Ordering Information
PART
MAX1832EUT-T
MAX1833EUT-T
MAX1834EUT-T
MAX1835EUT-T
TEMP. RANGE
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
TOP
MARK
AAOT
AAOU
AAOV
AAOW
Note:
Requires special solder temperature profile described in
the Absolute Maximum Ratings.
Pin Configurations
TOP VIEW
Selector Guide
PART
OUTPUT
VOLTAGE
Adjustable
Fixed 3.3V
Adjustable
Fixed 3.3V
OUTPUT VOLTAGE
IN SHUTDOWN
V
BATT
V
BATT
V
BATT
- 0.7V
V
BATT
- 0.7V
SHDN
1
6
FB
SHDN
1
6
RST
MAX1832EUT-T
MAX1833EUT-T
MAX1834EUT-T
MAX1835EUT-T
BATT
2
MAX1832
MAX1834
5
OUT
BATT
2
MAX1833
MAX1835
5
OUT
GND
3
4
LX
GND
3
4
LX
SOT23-6
SOT23-6
________________________________________________________________
Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim鈥檚 website at www.maxim-ic.com.

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