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PDF MAX1834 Data sheet ( Hoja de datos )
| Número de pieza | MAX1834 | |
| Descripción | High-Efficiency Step-Up Converters | |
| Fabricantes | Maxim Integrated | |
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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.
1 page  
High-Efficiency Step-Up Converters with
Reverse Battery Protection in a SOT23-6
Typical Operating Characteristics (continued)
(VOUT = +3.3V, VBATT= +2V, unless otherwise noted.) (Figure 1)
ON/OFF RESPONSE
MAX1832/35 toc10
LOAD TRANSIENT
MAX1832/35 toc11
VBATT
1V/div
VOUT
100mV/div
VOUT
1V/div
2ms/div
VSHDN = VBATT = 2.0V, RLOAD = 22Ω,
VOUT = 3.3V
LINE TRANSIENT
MAX1832/35 toc12
ILOAD
100mA/div
0
40µs/div
RLOAD = 22Ω TO 200Ω,
VOUT = +3.3V, VBATT = +2.0V
SHUTDOWN RESPONSE
MAX1832/35 toc13
40µs/div
IOUT = 100mA, VOUT = +3.3V,
VBATT = +2.0V TO +2.5V
VBATT
500mV/div
VOUT
50mV/div
VSHDN
1V/div
0
VOUT
1V/div
MAX1833
40µs/div
RLOAD = 22Ω, VBATT = 3.3V, VBATT = 2.0V
0
SWITCHING WAVEFORMS
MAX1832/35 toc14
VLX
500mA/div
VOUT
100mV/div
VLX
2V/div
10µs/div
IOUT = 40mA, VOUT = +3.3V, VBATT = +2.0V
_______________________________________________________________________________________ 5
5 Page 
High-Efficiency Step-Up Converters with
Reverse Battery Protection
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
PIN 1
INDEX
AREA
D
E
A2
N
b
E2
DETAIL A
D2
0.35x0.35
PIN 1 ID
[(N/2)-1] x e
REF.
e
A1 k
CL CL
AL
L
ee
-DRAWING NOT TO SCALE-
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
G
1
2
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1834.PDF ] | |
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