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MAX1935

500mA, Low-Voltage Linear Regulator in Tiny QFN

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX1935 low-dropout linear regulator operates from a 2.25V to 5.5V supply and delivers a guaranteed 500mA load current with low 175mV dropout. The high-accuracy (±1.5%) output voltage is preset at an internally trimmed voltage or can be adjusted from 0.8V to 4.5V with an external resistive-divider.

An internal PMOS pass transistor allows low 210µA supply current, making this device ideal for portable equipment such as personal digital assistants (PDAs), cellular phones, cordless phones, and other equipment, including base stations and docking stations.

Other features include an active-low, power-OK output that indicates when the output is out of regulation, a 0.02µA shutdown mode, short-circuit protection, and thermal-shutdown protection. The MAX1935 comes in a tiny 1.9W, 8-pin 3mm x 3mm thin QFN package.

Data Sheet

Download	Rev 0	(PDF, 252kB)
E-Mail

Key Features

Guaranteed 500mA Output Current
Output Down to 0.8V
Low 175mV Dropout at 500mA
±1.5% Output Voltage Accuracy
- Preset at 1.5V
- Adjustable from 0.8V to 4.5V
Power-OK Output
Low 210µA Ground Current
0.02µA Shutdown Current
Thermal-Overload Protection
Output Current Limit
Tiny 1.9W, 8-Pin 3mm x 3mm Thin QFN Package

Applications/Uses

Cell Phones/Cordless Phones
Docking Stations
Notebook Computers
Palmtop Computers
PDAs
USB Hubs
Wireless Base Stations

Key Specifications:

Linear Regulators

Part Number

Regulators

V_IN
(V)

Preset V_OUT
(V)

Special Order Preset

Adj. V_OUT
(V)

V_DROPOUT @Rated I_LOAD
(V)

Rated I_LOAD
(mA)

I_CC
(µA)

Output Voltage Noise
(µV RMS)

Ref. Bypass

Low Batt./ Pwr. Fail Out

POK/Reset Thresh.
(V)

Watchdog

Reverse Batt. Protect.

Oper. Temp.
(°C)

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

min

max

typ

max

typ

nom

max w/pins

See Notes

MAX1935

2.25

5.5

1.5

1.5 to 4.5 by 0.1

0.8

4.5

0.175

500

600

300

Vout-7%

-40 to +85

TDFN-EP/8

9.6

$1.00 @1k

See All Linear Regulators (146)

Pricing 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.

Diagram

Typical Operating Circuit

Application Notes

Tutorial 660

Regulator Topologies for Battery-Powered Systems

Reliability Reports

Reliability Report:	MAX1935.pdf
Show FIT data for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1935ETA			Active	TDFN-EP;8 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0059 (PDF) Use pkgcode/variation: T833-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1935ETA+			Active	TDFN-EP;8 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0059 (PDF) Use pkgcode/variation: T833+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1935ETA+T			Active	TDFN-EP;8 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0059 (PDF) Use pkgcode/variation: T833+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1935ETA-T			Active	TDFN-EP;8 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0059 (PDF) Use pkgcode/variation: T833-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1935ETA15+			Active	TDFN-EP;8 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0059 (PDF) Use pkgcode/variation: T833+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1935ETA15+T			Active	TDFN-EP;8 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0059 (PDF) Use pkgcode/variation: T833+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1935ETA15-T			Active	TDFN-EP;8 pin;9.6 mm² Outline Drawing:21-0137 (PDF) Land Pattern: 90-0059 (PDF) Use pkgcode/variation: T833-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

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