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MAX828

MAX828

Switched-Capacitor Voltage Inverters

Inductorless Power Supply for Pager LCD

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Overview

Description

The ultra-small MAX828/MAX829 monolithic, CMOS charge-pump inverters accept input voltages ranging from +1.5V to +5.5V. The MAX828 operates at 12kHz, and the MAX829 operates at 35kHz. Their high efficiency (greater than 90% over most of the load-current range) and low operating current (60µA for the MAX828) make these devices ideal for both battery-powered and board-level voltage-conversion applications.

The MAX828/MAX829 combine low quiescent current and high efficiency. Oscillator control circuitry and four power MOSFET switches are included on-chip. Applications include generating a -5V supply from a +5V logic supply to power analog circuitry. Both parts come in a 5-pin SOT23-5 package and can deliver 25mA with a voltage drop of 500mV.

For a similar device with logic-controlled shutdown, refer to the MAX1719/MAX1720/MAX1721. For applications requiring more power, the MAX860 delivers up to 50mA with a voltage drop of 600mV, in a space-saving µMAX® package.
MAX828, MAX829: Typical Operating Circuit MAX828, MAX829: Typical Operating Circuit Enlarge+

Key Features

  • 5-Pin SOT23-5 Package
  • 95% Voltage Conversion Efficiency
  • Inverts Input Supply Voltage
  • 60µA Quiescent Current (MAX828)
  • +1.5V to +5.5V Input Voltage Range
  • Requires Only Two Capacitors
  • 25mA Output Current

Applications/Uses

  • Battery-Powered Applications
  • Cell Phones
  • Handy-Terminals, PDAs
  • Medical Instruments
  • Small LCD Panels

Parametric Specs

Part NumberTopologyVIN
(V)		VIN
(V)		ICC
(mA)		Unadj. VOUT
(V)		IOUT
(A)		Oper. Freq.
(kHz)		Oper. Temp.
(°C)		Package/PinsBudgetary
Price
minmaxmaxtypSee Notes
MAX828 
Inverter
Unregulated
1.55.50.09-VIN0.02512
-40 to +85
0 to +70
SOT23/5
$2.27 @1k
MAX829 0.2635
SOT23/5
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

Technical Documents

App Note 2621
App Note 971 Tiny Charge Pump Provides Highly Reliable Low-Cost Solution to Negative Reference Voltage
Tutorial 737 Choosing the Right Power-Supply IC for your Application
Tutorial 725 DC-DC Conversion Without Inductors

Quality and Environmental Data

Product Reliability Reports: MAX828.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.

Quality Management System >
Environmental Management System >

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