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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1832 Datasheet

High-Efficiency Step-Up Converters

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MAX1832 pdf
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 54
MAX1832
BATT 2 MAX1834 5 OUT
(MAX1833EUT)
(MAX1835)
GND 3
4 LX
SOT23
MAX1833ETT
1 23
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-
PACKAGE
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1832 Datasheet

High-Efficiency Step-Up Converters

No Preview Available !

MAX1832 pdf
High-Efficiency Step-Up Converters with
Reverse Battery Protection
ABSOLUTE MAXIMUM RATINGS
BATT, LX to GND.........................................................-6V to +6V
LX to OUT ....................................................................-6V to +1V
SHDN to GND..............................................-6V to (VOUT + 0.3V)
OUT, FB, RST TO GND ............................................-0.3V to +6V
LX Current ................................................................................1A
Continuous Power Dissipation (TA = +70°C)
6-Pin SOT23 (derate 9.1mW/°C above +70°C) ...........727mW
6-Pin 3mm 3mm TDFN (derate 18.2mW/°C
above +70°C) .........................................................1454.5mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V SHDN = +1.5V, VOUT = +3.3V, VBATT = +2V, GND = 0, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
Output Range
Battery Input Range
Startup Battery Input Voltage
Output Voltage
FB Trip Voltage
FB Input Bias Current
N-Channel On-Resistance
P-Channel On-Resistance
P-Channel Catch-Diode Voltage
N-Channel Switch Current Limit
Switch Maximum On-Time
Synchronous Rectifier Zero-
Crossing Current
Quiescent Current into OUT
(Note 2)
Shutdown Current into OUT
SYMBOL
VOUT
VBATT
VSU
VOUT
VFB
IFB
RNCH
RPCH
IMAX
tON
CONDITIONS
MAX1832/MAX1834
RLOAD = 2.6k
MAX1833EUT/
MAX1835EUT
MAX1833ETT30
MAX1832/
MAX1834
MAX1832/
MAX1834,
VFB = +1.3V
VOUT = +3.3V
ILX = 100mA
VOUT = +3.3V
ILX = 100mA
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
ILX = 100mA, PCH off, VOUT = +3.5V,
VFB = +1.3V
VOUT = +3.3V
TA = +25°C
TA = -40°C to +85°C
VOUT = +3.3V
TA = +25°C
TA = -40°C to +85°C
VOUT = +3.5V,
VFB = +1.3V
TA = +25°C
TA = -40°C to +85°C
VOUT = +3.5V, VSHDN = VFB = 0V
MIN
2.0
1.5
3.225
3.208
2.94
2.925
1.208
1.204
TYP
1.22
1.24
3.290
3.0
1.228
3.5
4.0
0.4
0.5
MAX
5.5
5.5
1.5
3.355
3.372
3.06
3.075
1.248
1.252
20
1.2
1.5
1.3
1.6
UNITS
V
V
V
V
V
nA
0.73 V
435 525 615
400 650
3.5 5 6.5
2 17 34
0 39
2.5 7.0
8.0
0.05 1
mA
µs
mA
µA
µA
2 _______________________________________________________________________________________


Part Number MAX1832
Description High-Efficiency Step-Up Converters
Maker Maxim
Total Page 12 Pages
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