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MAX889

High-Frequency, Regulated, 200mA, Inverting Charge Pump

Regulated Inverting Charge Pump Delivers 200mA for Negative Supply without Inductors

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Overview

Description

The MAX889 inverting charge pump delivers a regulated negative output voltage at loads of up to 200mA. The device operates with inputs from 2.7V to 5.5V to produce an adjustable, regulated output from -2.5V to -V_IN.

The MAX889 is available with an operating frequency of 2MHz (T version), 1MHz (S version), or 0.5MHz (R version). The higher switching frequency devices allow the use of smaller capacitors for space-limited applications. The lower frequency devices have lower quiescent current.

The MAX889 also features a 0.1µA logic-controlled shutdown mode and is available in an 8-pin SO package. An evaluation kit, MAX889SEVKIT, is available.

MAX889: Typical Operating Circuit

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Key Features

200mA Output Current
Up to 2MHz Switching Frequency
Small Capacitors (1µF)
+2.7V to +5.5V Input Voltage Range
Adjustable Regulated Negative Output (-2.5V to -V_IN)
0.1µA Logic-Controlled Shutdown
Low 0.05Ω Output Resistance (in regulation)
Soft-Start and Foldback Current Limited
Short-Circuit and Thermal Shutdown Protected
8-Pin SO Package

Applications/Uses

Battery-Powered Applications
Camcorders
Digital Still Cameras
Hard Disk Drive
Measurement Instrumentation
TFT Panels

Parametric Specs

Part Number

Topology

V_IN
(V)

I_CC
(mA)

Unadj. V_OUT
(V)

Adj. V_OUT
(V)

I_OUT
(A)

Oper. Freq.
(kHz)

Oper. Temp.
(°C)

Package/Pins

Budgetary
Price

min

max

min

max

typ

See Notes

MAX889R

Inverter

Regulated

2.7

5.5

-V_IN

-2.5

0.2

500

-40 to +85

SOIC(N)/8

$2.22 @1k

MAX889S

1000

SOIC(N)/8

MAX889T

2000

SOIC(N)/8

See All Charge Pumps (45)

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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

MAX889SEVKIT: Evaluation Kit for the MAX889S

Technical Documents

App Note 3659 Simple Circuit Converts +5V to -10V
Tutorial 737 Choosing the Right Power-Supply IC for your Application

Quality and Environmental Data

Product Reliability Reports: MAX889.pdf
Lead-Free Package Tin (Sn) Whisker Reports

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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