General Description

The MAX17005B/MAX17006B/MAX17015B are high-fre-

quency multichemistry battery chargers. These circuits

feature a new high-frequency current-mode architecture

that significantly reduces component size and cost*.

The charger uses a high-side MOSFET with n-channel

synchronous rectifier. Widely adjustable charge current,

charge voltage, and input current limit simplify the con-

struction of highly accurate and efficient chargers.

The charge voltage and charge current are set with

analog control inputs. The charge current setting can

also be adjusted with a PWM input. High-accuracy cur-

rent-sense amplifiers provide fast cycle-by-cycle cur-

rent-mode control to protect against short circuits to the

battery and respond quickly to system load transients.

In addition, the charger provides a high-accuracy ana-

log output that is proportional to the adapter current. In

the MAX17015B, this current monitor remains active

when the adapter is absent to monitor battery dis-

charge current.

The MAX17005B charges three or four Li+ series cells,

and the MAX17006B charges two or three Li+ series

cells. The MAX17015B adjusts the charge voltage set-

ting and the number of cells through a feedback resis-

tor-divider from the output. All variants of the charger

can provide at least 4A of charge current with a 10m

Ω

sense resistor.

The charger utilizes a charge pump to control an n-channel

adapter selection switch. The charge pump remains

active even when the charger is off. When the adapter

is absent, a p-channel MOSFET selects the battery.

The MAX17005B/MAX17006B/MAX17015B are avail-

able in a small, 4mm x 4mm x 0.8mm 20-pin, lead-free

TQFN package. An evaluation kit is available to reduce

design time.

Applications

Notebook Computers

Tablet PCs

Portable Equipment with Rechargeable Batteries

Features

o High Switching Frequency (1.2MHz)

o Controlled Inductor Current-Ripple Architecture

Reduced BOM Cost

Small Inductor and Output Capacitors

o ±0.4% Accurate Charge Voltage

o ±2.5% Accurate Input-Current Limiting

o ±3% Accurate Charge Current

o Single-Point Compensation

o Monitor Outputs for

±2.5% Accurate Input Current Limit

±2.5% Battery Discharge Current

(MAX17015B Only)

AC Adapter Detection

o Analog/PWM Adjustable Charge-Current Setting

o Battery Voltage Adjustable for 3 and 4 Cells

(MAX17005B) or 2 and 3 Cells (MAX17006B)

o Adjustable Battery Voltage (4.2V to 4.4V/Cell)

o Cycle-by-Cycle Current Limit

Battery Short-Circuit Protection

Fast Response for Pulse Charging

Fast System-Load-Transient Response

o Programmable Charge Current < 5A

o Automatic System Power Source Selection with

n-Channel MOSFET

o Internal Boost Diode

o +8V to +26V Input Voltage Range

1.2MHz, Low-Cost,

High-Performance Chargers

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-4576; Rev 0; 4/09

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.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

**EP = Exposed pad.

PART

TEMP RANGE

PIN-PACKAGE

MAX17005BETP+

-40

°C to +85°C

20 TQFN-EP**

MAX17006BETP+

-40

°C to +85°C

20 TQFN-EP**

MAX17015BETP+

-40

°C to +85°C

20 TQFN-EP**

Pin Configuration and Minimal Operating Circuit appear at

end of data sheet.

*

Patent pending.

EVALUATION

KIT

AVAILABLE