MAX8815AETB+ MAXIM [Maxim Integrated Products], MAX8815AETB+ Datasheet

MAX8815AETB+

Manufacturer Part Number

MAX8815AETB+

Description

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

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX8815AETB.pdf (12 pages)

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The MAX8815A DC-DC step-up converter is a high-effi-

ciency, low quiescent current, synchronous step-up

converter with True Shutdown™ and inrush-current lim-

iting. 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) quies-

cent current and allows the converter to switch only

when needed at no load and light loads. Under moder-

ate and heavy loads (typically above 90mA), the

MAX8815A uses a fixed-frequency pulse-width modula-

tion (PWM) technique. This mode allows maximum effi-

ciency 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.

19-4092; Rev 0; 5/08

True Shutdown is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

DSC and DVC

Microprocessor/DSP Core Power

Cell Phones, PDAs, MP3 Players

Portable Handheld Devices

PCMCIA Cards

1A, 97% Efficiency, 30µA Quiescent Current

TOP VIEW

________________________________________________________________ Maxim Integrated Products

Step-Up Converter with True Shutdown

General Description

MAX8815A

EVALUATION KIT

AVAILABLE

Pin Configuration

Applications

♦ Up to 97% Efficiency with Internal Synchronous

♦ Low 30µA Quiescent Current

♦ Guaranteed 500mA Output Current at V

♦ Guaranteed 1A Output Current at 5V from 2.5V

♦ Low-Noise Constant Frequency Operation (FPWM

♦ 2MHz PWM Switching Frequency

♦ Preset (5V) or Adjustable Output

♦ Controlled Current in Soft-Start Limits Inrush

♦ True Shutdown

♦ Internal Compensation

♦ Overload/Short-Circuit Protection

♦ 0.1µA Shutdown Current

♦ Thermal Shutdown

♦ Compact 10-Pin, 3mm x 3mm TDFN Package

+ Denotes a lead-free package.

* EP = Exposed pad.

Note: This device operates in the -40°C to +85°C extended

operating temperature range.

MAX8815AETB+

INPUT VOLTAGE

Rectifier

from 1.8V Input

Input

Mode)

Current

1.2V TO 5.5V

PART

Typical Operating Circuit

BATT

SKIPB

Ordering Information

PIN-PACKAGE

10 TDFN-EP*

MAX8815A

POUT

OUTS

GND

Features

TOP MARK

OUT

OUTPUT VOLTAGE

5V UP TO 1A

AUH

= 5V

Related parts for MAX8815AETB+

MAX8815AETB+ Summary of contents

Page 1

... Internal Compensation ♦ Overload/Short-Circuit Protection ♦ 0.1µA Shutdown Current ♦ Thermal Shutdown ♦ Compact 10-Pin, 3mm x 3mm TDFN Package PART Applications MAX8815AETB+ + Denotes a lead-free package Exposed pad. Note: This device operates in the -40°C to +85°C extended operating temperature range. INPUT VOLTAGE 1.2V TO 5.5V ...

Page 2

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown ABSOLUTE MAXIMUM RATINGS OUTS, BATT to GND ................................................-0.3V to +6V POUT to OUTS ......................................................-0.3V to +0.3V PGND (EP) to AGND .............................................-0.3V to +0. GND ................................................-0. ...

Page 3

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown ELECTRICAL CHARACTERISTICS (continued 5V 3.6V, V OUTS POUT ON BATT noted. Limits are 100% production tested at T characterization.) PARAMETER DC-DC ...

Page 4

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown ( 5V 3.6V, V OUTS POUT BATT ON EFFICIENCY vs. LOAD CURRENT, V 100 V = 1.8V, SKIP 1.5V, ...

Page 5

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown ( 5V 3.6V, V OUTS POUT BATT ON EP TEMPERATURE vs. INPUT VOLTAGE 120 OUT T = +25°C A ...

Page 6

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown ( 5V 3.6V, V OUTS POUT BATT ON HEAVY-LOAD SWITCHING WAVEFORMS V OUT 200ns/div LIGHT-LOAD SWITCHING WAVEFORMS (SKIPB ...

Page 7

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown PIN NAME Inductor Connection. LX pins are internally connected. Connect the LX pins to the switched side the inductor high impedance in shutdown. ...

Page 8

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown 3V + OUTS - ON ON GND REFERENCE Detailed Description The MAX8815A current-mode step-up DC-DC switching converter uses a fixed-frequency PWM architecture with True Shutdown. In normal mode, the ...

Page 9

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown INPUT VOLTAGE 1.2V TO 5.5V C1 10μF NORM INPUT VOLTAGE 1.2V TO 5.5V C1 10μF Figure 1. Typical Application Circuits _______________________________________________________________________________________ L 2μ BATT LX 9, ...

Page 10

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown DC-DC Converter The MAX8815A uses a current-mode PWM control scheme. The voltage difference between FB and an internal 1.265V (typ) reference generates an error sig- nal that programs the ...

Page 11

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown LOAD TRANSIENT MAX8815A toc18 V OUT 800mA I OUT 10mA 1ms/div Figure 2. Load Regulation 9% (a) HIGH-GAIN DC LOAD REGULATION WITH POOR TRANSIENT RESPONSE 3% (b) VOLTAGE POSITIONING ...

Page 12

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown Inductor Selection In most step-up converter designs, a reasonable induc- tor value can be derived from the following equation. This equation sets peak-to-peak inductor current at 1/2 the DC ...

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