MAX1836, MAX1837 24V Internal Switch, 100% Duty Cycle, Step-Down Converters

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 applications. 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 currents, use the MAX1626/MAX1627 step-down controllers that drive an external P-channel MOSFET to deliver up to 20W.

Key Features

Applications/Uses

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

	4mA to 20mA Loop Power Supplies
	9V Battery Systems
	Backup Supplies
	Distributed Power Systems
	Handheld Devices
	Industrial Control Supplies
	Notebook Computers

Key Specifications: Step-Down Switching Regulators

Part Number

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

Preset V_OUT (V)

I_OUT (A)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Operating Freq. (kHz)

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX1836

4.5

1.25

3.3

0.125

Preset
Resistor

0.025

200

•	Current Limit

•	Internal Power Switches

•

Shutdown

SOT-23/6
THIN QFN (Dual)/6

Yes

-40 to +85

$2.07 @ 1k

MAX1837

0.25

$2.07 @ 1k

See All Step-Down Switching Regulators (223)

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Preset V_OUT (V)

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Operating Freq. (kHz)

Internal Power Switch(es)

Package

Price^**

MAX1836

Step-Down

4.5

3.3

1.25

0.125

0.025

200

Yes

SOT-23/6
THIN QFN (Dual)/6

$2.07 @ 1k

MAX1837

0.25

$2.07 @ 1k

See All Switch-Mode DC-DC Power Supplies (429)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Reliability Reports


		Show FIT data for:

		Reliability Report: MAX1836ExTxx.pdf

		Request Reliability Report for:

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-24 of 24

MAX1836

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1836EUT50#TG16

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6FH-6*

-40°C to +85°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

MAX1836EUT33#TG16

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6FH-6*

-40°C to +85°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

MAX1836EUT50#G16

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6FH-6*

-40°C to +85°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

MAX1836EUT33#G16

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6FH-6*

-40°C to +85°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

MAX1836EUT33

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6F-6*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1836EUT50

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6F-6*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1836EUT50-T

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6F-6*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1836EUT33-T

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6F-6*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1836ETT50+

TDFN;6 pin;
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T633+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1836ETT50+T

TDFN;6 pin;
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T633+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1836ETT33+

TDFN;6 pin;
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T633+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1836ETT33+T

TDFN;6 pin;
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T633+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1837

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1837EUT33#TG16

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6FH-6*

-40°C to +85°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

MAX1837EUT50#G16

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6FH-6*

-40°C to +85°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

MAX1837EUT33#G16

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6FH-6*

-40°C to +85°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

MAX1837EUT33

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6F-6*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1837EUT50

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6F-6*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1837EUT50#TG16

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6FH-6*

-40°C to +85°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

MAX1837EUT33-T

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6F-6*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1837EUT50-T

SOT-23;6 pin;
Dwg: 21-0058I (PDF)
Use pkgcode/variation: U6F-6*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1837ETT50+

TDFN;6 pin;
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T633+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1837ETT33+

TDFN;6 pin;
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T633+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1837ETT50+T

TDFN;6 pin;
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T633+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1837ETT33+T

TDFN;6 pin;
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T633+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis