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MAX1837ETT50+T

Description
voltage regulators - switching regulators 24v 100% duty cycle
CategoryPower/power management    The power supply circuit   
File Size420KB,15 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Environmental Compliance
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MAX1837ETT50+T Overview

voltage regulators - switching regulators 24v 100% duty cycle

MAX1837ETT50+T Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerMaxim
Parts packaging codeSON
package instructionHVSON, SOLCC6,.13,38
Contacts6
Reach Compliance Codecompli
ECCN codeEAR99
Factory Lead Time6 weeks
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage24 V
Minimum input voltage4.5 V
Nominal input voltage12 V
JESD-30 codeS-PDSO-N6
JESD-609 codee3
length3 mm
Humidity sensitivity level1
Number of functions1
Number of terminals6
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current0.9 A
Nominal output voltage5 V
Package body materialPLASTIC/EPOXY
encapsulated codeHVSON
Encapsulate equivalent codeSOLCC6,.13,38
Package shapeSQUARE
Package formSMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height0.8 mm
surface mountYES
Switch configurationBUCK
technologyBICMOS
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn)
Terminal formNO LEAD
Terminal pitch0.95 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width3 mm
19-1919; Rev 3; 7/06
24V Internal Switch, 100% Duty Cycle,
Step-Down Converters
General Description
The MAX1836/MAX1837 high-efficiency step-down
converters provide a preset 3.3V or 5V output voltage
from supply voltages as high as 24V. Using external
feedback resistors, the output voltage may be adjusted
from 1.25V to V
IN
. An internal current-limited switching
MOSFET delivers load currents up to 125mA
(MAX1836) or 250mA (MAX1837).
The unique current-limited control scheme, operating
with duty cycles up to 100%, minimizes the dropout
voltage (120mV at 100mA). Additionally, this control
scheme reduces supply current under light loads to
12µA. High switching frequencies allow the use of tiny
surface-mount inductors and output capacitors.
The MAX1836/MAX1837 step-down converters with
internal switching MOSFETs are available in 6-pin
SOT23 and 3mm x 3mm TDFN packages, making them
ideal for low-cost, low-power, space-sensitive applica-
tions. For increased output drive capability, use the
MAX1776 step-down converter that uses an internal
24V switch to deliver up to 500mA. For even higher cur-
rents, use the MAX1626/ MAX1627 step-down con-
trollers that drive an external P-channel MOSFET to
deliver up to 20W.
____________________________Features
4.5V to 24V Input Voltage Range
Preset 3.3V or 5V Output
Adjustable Output from 1.25V to V
IN
Output Currents Up to 125mA (MAX1836) or
250mA (MAX1837)
Efficiency Over 90%
12µA Quiescent Current
3µA Shutdown Current
100% Maximum Duty Cycle for Low Dropout
Small 6-Pin SOT23 and TDFN Packages
MAX1836/MAX1837
Ordering Information
PART
MAX1836ETT33-T
MAX1836ETT50-T
MAX1836EUT33-T
MAX1836EUT50-T
MAX1837ETT33-T
MAX1837ETT50-T
MAX1837EUT33-T
MAX1837EUT50-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
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 TDFN-EP*
6 TDFN-EP*
6 SOT23-6
6 SOT23-6
6 TDFN-EP*
6 TDFN-EP*
6 SOT23-6
6 SOT23-6
TOP
MARK
AJG
AJE
AANY
AANW
AJH
AJF
AANZ
AANX
Applications
9V Battery Systems
Notebook Computers
Distributed Power Systems
Backup Supplies
4mA to 20mA Loop Power Supplies
Industrial Control Supplies
Handheld Devices
*EP
= Exposed pad.
Selector Guide appears at end of data sheet.
Typical Operating Circuit
INPUT
4.5V TO 24V
OUTPUT
3.3V OR 5V
IN
SHDN
OUT
MAX1836
MAX1837
GND
FB
LX
Pin Configurations
TOP VIEW
FB
1
6
OUT
FB
1
GND
2
5
SHDN
IN
3
IN
3
4
LX
6
OUT
SHDN
LX
GND
2
MAX1836
MAX1837
MAX1836
MAX1837
5
4
TDFN
NOTE:
HIGH-CURRENT PATHS SHOWN WITH BOLD LINES.
SOT23
________________________________________________________________
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.

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