MAX1836 Maxim, MAX1836 Datasheet
MAX1836
Manufacturer Part Number
MAX1836
Description
24V Internal Switch / 100% Duty Cycle / Step-Down Converters
Manufacturer
Maxim
Datasheet
1.MAX1836.pdf
(13 pages)
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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
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 a 6-pin
SOT23 package, making them ideal for low-cost, low-
power, space-sensitive applications. For increased out-
put drive capability, use the MAX1776 step-down
converter that uses an internal 24V switch to deliver up
to 500mA. For even higher currents, use the MAX1626/
MAX1627 step-down controllers that drive an external
P-channel MOSFET to deliver up to 20W.
________________________Applications
19-1919; Rev 1; 01/02
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.
NOTE: HIGH-CURRENT PATHS SHOWN WITH BOLD LINES.
INPUT
4.5V TO 24V
9V Battery Systems
Notebook Computers
Distributed Power Systems
Backup Supplies
4mA to 20mA Loop Power Supplies
Industrial Control Supplies
Hand-Held Devices
IN
SHDN
GND
Typical Operating Circuit
IN
. An internal current-limited switching
________________________________________________________________ Maxim Integrated Products
MAX1836
MAX1837
24V Internal Switch, 100% Duty Cycle,
General Description
OUT
LX
FB
3.3V OR 5V
OUTPUT
o 4.5V to 24V Input Voltage Range
o Preset 3.3V or 5V Output
o Adjustable Output from 1.25V to V
o Output Currents Up to 125mA (MAX1836) or
o Internal P-Channel MOSFET
o Efficiency Over 90%
o 12µA Quiescent Current
o 3µA Shutdown Current
o 100% Maximum Duty Cycle for Low Dropout
o Current-Limiting and Overtemperature Protection
o Small 6-Pin SOT23 Package
____________________________Features
Note: The MAX1836/MAX1837 require special solder tempera-
ture profile described in the Absolute Maximum Ratings.
MAX1836EUT50-T
MAX1836EUT33-T
MAX1837EUT50-T
MAX1837EUT33-T
MAX1836EUT50
MAX1836EUT33
MAX1837EUT50
MAX1837EUT33
Step-Down Converters
250mA (MAX1837)
PART
PART
TOP VIEW
GND
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
FB
IN
PRESET OUTPUT
Ordering Information
VOLTAGE (V)
1
2
3
MAX1836
MAX1837
SOT23
3.3
3.3
Pin Configuration
5
5
Selector Guide
6
5
4
PIN-
PA C K A G E
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
OUT
SHDN
LX
IN
CURRENT (mA)
LOAD
125
125
250
250
AANW
AANY
AANX
AANZ
M ARK
TOP
1
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