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MAX17435

High-Frequency, Low-Cost SMBus Chargers

Maxim Integrated 

19-4817; Rev 1; 9/10

EVAALVUAAILTAIOBNLEKIT

High-Frequency,

Low-Cost SMBus Chargers

General Description

The MAX17435/MAX17535 integrated multichemistry

battery-charger ICs simplify construction of accurate

and efficient chargers. The MAX17435/MAX17535

provide SMBusK-programmable charge current, charge

voltage, input current limit, relearn voltage, and digital

readback of the IINP voltage. The MAX17435/MAX17535

utilize a charge pump to control the adapter selection

n-channel MOSFETs when the adapter is present. When

the adapter is absent, the charge pump is shut down and

a p-channel MOSFET selects the battery.

The MAX17435/MAX17535 provide up to 7A of charge

current to 2, 3, or 4 lithium-ion (Li+) cells in series. The

charge current, and input current-limit sense amplifiers have

low offset errors and can use 10mI sense resistors. The

MAX17435/MAX17535 fixed-inductor ripple architecture

significantly reduces component size and circuit cost.

The MAX17435/MAX17535 provide a digital output that

indicates the presence of the adapter, an analog output

that indicates the adapter or battery current, depending

upon the presence or absence of the adapter, and a

digital output that indicates when the adapter current

exceeds a user-defined threshold.

The MAX17435 switches at an 850kHz frequency and the

MAX17535 switches at 500kHz.

The MAX17435/MAX17535 are available in a small, 4mm

x 4mm x 0.75mm, 24-pin, lead-free TQFN package. An

evaluation kit is available.

Applications

Notebook Computers

PDAs and Mobile Communicators

2- to 4- Li+ Cell Battery-Powered Devices

Features

S Low-Cost SMBus Charger

S High Switching Frequency (0.85MHz/0.5MHz)

S Internal Boost Switches

S SMBus-Programmable Charge Voltage, Input

Current Limit, Charge Current, Relearn Voltage,

and Digital IINP Readback

S Single-Point Compensation

S Automatic Selection of System Power Source

Adapter n-Channel MOSFETs Driven by an

Internal Dedicated Charge Pump

Adapter Soft-Start

S ±0.4% Accurate Charge Voltage

S ±2.5% Accurate Input Current Limiting

S ±3% Accurate Charge Current

S Monitor Outputs for

AC Adapter Current (±2% Accuracy)

Battery Discharge Current (±2% Accuracy)

AC Adapter Presence

S AC Adapter Overvoltage Protection

S 11-Bit Battery Voltage Setting

S 6-Bit, Charge-Current Setting/Input Current Setting

S Improved IINP Accuracy at Low Input Current

Ordering Information

PART

MAX17435ETG+

MAX17535ETG+

TEMP RANGE

-40NC to +85NC

-40NC to +85NC

PIN-PACKAGE

24 TQFN-EP*

24 TQFN-EP*

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

*EP = Exposed pad.

Pin Configuration

TOP VIEW

18 17 16 15 14 13

ACIN 19

12 CSIP

ITHR 20

11 CSIN

VAA 21

VCC 22

GND 23

EN 24

MAX17435

MAX17535

10 ACOK

9 DHI

8 LX

7 BST

12 3456

SMBus is a trademark of Intel Corp.

________________________________________________________________ Maxim Integrated Products   1

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.

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