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General Description

The MAX1874 charges a single-cell Li+ battery from

both USB and AC adapter sources. It also includes bat-

tery-to-input power switchover, so the system can be

powered directly from the power source rather than

from the battery.

In its simplest application, the MAX1874 needs no

external MOSFET or diodes, and accepts input volt-

ages up to 6.5V; however, DC input overvoltage protec-

tion up to 18V can be added with a single SOT PFET.

On-chip thermal limiting simplifies printed circuit board

(PCB) layout and allows optimum charging rate without

the thermal limits imposed by worst-case battery and

input voltage. When the MAX1874 thermal limit is

reached, the charger does not shut down but simply

reduces charging current.

Ambient or battery temperature can be monitored with

an external thermistor. When the temperature is out of

range, charging pauses.

Other features include a CHG output to indicate when

battery current tapers below a predetermined level. DC

power-OK (DCOK), USB power-OK (UOK), and power-

on (PON) outputs indicate when valid power is present.

These outputs drive logic or power-selection MOSFETs

to disconnect the charging sources from the load and

to protect the MAX1874 from overvoltage.

The MAX1874 contains no logic for communication with

the USB host. It must receive instructions from a local

microcontroller. The MAX1874 is available in a 16-pin

5mm ✕ 5mm thin QFN package and operates over the

-40°C to +85°C temperature range.

Applications

PDAs Cell Phones

Wireless Appliances Digital Cameras

Features

♦ Charge from USB or AC Adapter

♦ Automatic Switchover to AC Adapter

♦ Thermal Limiting Simplifies Board Design

♦ Small, High-Power 16-Pin Thin QFN Package

♦ Input Protection Up to 18V

♦ Soft-Start

♦ Automatic Battery-to-Input Load Switch

MAX1874

Dual-Input, USB/AC Adapter, 1-Cell

Li+ Charger with OVP and Thermal Regulation

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2912; Rev 1; 2/07

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX1874ETE

-40°C to +85°C

16 Thin QFN

5mm x 5mm

T1655-2

16 15 14 13

DCOK

BATT

PON

UOK

REF

PGND

BYP

USB

USEL

CHG

DCLV

5678

GND

DCI

THRM

MAX1874

THIN QFN

5mm x 5mm

TOP VIEW

Pin Configuration

Functional Diagram appears at the end of the data sheet.

MAX1874

USB INPUT

DC INPUT

TO REF

DCLV

GND

BATT

NTC

THERMISTOR

PON

REF

THRM

USB

Li+

CELL

USEL

500mA

100mA

ENDCI

PGND

BYP

REGULATOR

UOK

CHG

DCOK

Typical Operating Circuit

MAX1874

Dual-Input, USB/AC Adapter, 1-Cell

Li+ Charger with OVP and Thermal Regulation

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

USB

= V

DCLV

= V

USEL

= 5V, V

BATT

= 4.2V, V

THRM

= V

REF

/ 2, Circuit of Figure 2, T

= 0°C to +85°C, unless otherwise

noted. Typical values are at T

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

DC, DCOK to GND .................................................-0.3V to +20V

DCLV, BYP, USB, UOK, DCI, REF, USEL, THRM,

EN, BATT, CHG, PON to GND .............................-0.3V to +7V

PGND to GND .......................................................-0.3V to +0.3V

Continuous Current (DCLV) ..................................................1.1A

Continuous Current (USB) ....................................................0.6A

Continuous Power Dissipation (T

= +70°C)

16-Pin 5mm

✕ 5mm Thin QFN

(derate 21.3mW/°C above +70°C)...................................1.7W

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Maximum Junction Temperature .....................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER CONDITIONS

MIN TYP MAX

UNITS

INPUT VOLTAGE RANGES AND INPUT CURRENT

Maximum DC Input Voltage with

Overvoltage Protection

Q2 input MOSFET must be in place; charging

occurs only below 6.2V, Figures 3, 4, and 5

18 V

Maximum DC Input Voltage Without

Overvoltage Protection

DC = DCLV, Q2 input MOSFET not on circuit,

Figure 2

6.5 V

Maximum Input Voltage for Charging 6.0 6.2 6.5 V

= 0V 2 4

DC Supply Current

= 5V 4 6

DCLV Operating Voltage Range

4.35 6.00

DCLV Shutdown Supply Current V

= 0V

300

500 µA

USB Input Voltage Range

4.35 6.50

= 0V

500

750 µA

= 5V, V

= 0V 2 3 mA

USB Supply Current

= 5V, V

= 5V

160

300 µA

DCI Input Current 1 100 nA

BYP Output Resistance (Note 1) 5 Ω

THRM Input Bias Current 1 100 nA

BATTERY VOLTAGE

BATT Regulation Voltage

4.1685 4.20 4.2315

BATT Prequal Voltage Threshold BATT rising 2.8 3 3.2 V

Prequal Threshold Hysteresis 70 mV

USB

= 100mA

100

USB Charging Headroom

USB

= 500mA

200

DC Charging Headroom I

DCIN

= 800mA

250

REF Voltage (Buffered Output)

REF

= 0 to 500µA, 4V < V

or V

USB

< 6.5V;

does not affect BATT regulation accuracy

2.94

3.06

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