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MAX8815A

MAX8815A

1A, 97% Efficiency, 30µA Quiescent Current, Step-Up Converter with True Shutdown

Highest Efficiency, 1A Output Boost Converter

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Overview

Description

The MAX8815A DC-DC step-up converter is a high-efficiency, low quiescent current, synchronous step-up converter with True Shutdown™ and inrush-current limiting. The MAX8815A generates any output voltage from 3.3V to 5V from a 2-cell NiMH/NiCd or a single-cell Li+/Li polymer battery.

The MAX8815A uses two modes of operation. The first mode of operation (normal) uses only 30µA (typ) quiescent current and allows the converter to switch only when needed at no load and light loads. Under moderate and heavy loads (typically above 90mA), the MAX8815A uses a fixed-frequency pulse-width modulation (PWM) technique. This mode allows maximum efficiency at light loads. The second mode of operation is a fixed-frequency forced-pulse-width modulation (FPWM) mode where the converter switches at a fixed frequency irrespective of the load. This mode allows for easy noise filtering and lower output ripple.

The MAX8815A has a preset 2.5A current limit, allowing 500mA load at 1.8V input and 1A load at 2.5V input when the output is set to 5V. Features include soft-start, which limits inrush current during startup, True Shutdown, and internal compensation. The MAX8815A is available in a compact 10-pin, 3mm x 3mm TDFN package.

The MAX8815A evaluation kit can help shorten the time required for system design.
MAX8815: Typical Application Circuits MAX8815: Typical Application Circuits Enlarge+

Key Features

  • Up to 97% Efficiency with Internal Synchronous Rectifier
  • Low 30µA Quiescent Current
  • Guaranteed 500mA Output Current at VOUT = 5V from 1.8V Input
  • Guaranteed 1A Output Current at 5V from 2.5V Input
  • Low-Noise Constant Frequency Operation (FPWM Mode)
  • 2MHz PWM Switching Frequency
  • Preset (5V) or Adjustable Output
  • Controlled Current in Soft-Start Limits Inrush Current
  • True Shutdown
  • Internal Compensation
  • Overload/Short-Circuit Protection
  • 0.1µA Shutdown Current
  • Thermal Shutdown
  • Compact 10-Pin, 3mm x 3mm TDFN Package

Applications/Uses

  • Cell Phones, PDAs, MP3 Players
  • DSC and DVC
  • Microprocessor/DSP Core Power
  • PCMCIA Cards
  • Portable Handheld Devices

Parametric Specs

Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		IOUT1
(A)		Output Adjust. MethodSwitch TypeSynchronous SwitchingICC
(mA)		Shutdown Mode Supply Current
(µA)		Shutdown Mode Supply Current
(µA)		DC-DC OutputsOper. Freq.
(kHz)		Package/PinsBudgetary
Price
minmaxminmaxtyptypmaxSee Notes
MAX8815A 1.25.51.2655.51ResistorInternalYes0.030.1112000
TDFN/10
$1.29 @1k
See All Step-Up Switching Regulators (97)
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


MAX8815AEVKIT: Evaluation Kit for the MAX8815A

Technical Documents

App Note 7024 How to Efficiently Power Your Smart Gas/Water Meter
App Note 5818 Get a Constant +5V Output by Switching Between a +5V Input and a Single-Cell Li+ Rechargeable Cell
App Note 5287 Simple Low-Voltage High-Brightness (HB)-LED Solution for Li+ Battery-Operated Systems
App Note 4328 Low-Loss LED Driver Improves a System's Green Footprint by Boosting Efficiency and Extending Battery Life
Tutorial 2031 DC to DC Buck Converter Tutorial

Quality and Environmental Data

Product Reliability Reports: MAX8815A.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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Technical Docs

Reference Designs

Type ID Title
Evaluation Board5976MAX8815AEVKIT Evaluation Kit for the MAX8815A