Rainbow Electronics MAX8804Z User Manual

General Description

The MAX8804Y/MAX8804Z intelligent, dual-input,
stand-alone, constant-current, constant-voltage
(CCCV), thermally regulated linear chargers are
designed for a single-cell lithium-ion (Li+) battery. They
integrate the current-sense circuit, MOS pass element,
thermal-regulation circuitry, and overvoltage protection
(OVP), and eliminate the reverse-blocking Schottky
diode to create a simple and small charging solution for
handheld equipment.

The MAX8804Z functions as a stand-alone charger to
control the charging sequence from the prequalification
state through fast-charge, top-off charge, and full­charge indication. The MAX8804Y eliminates the pre­qualification state to allow startup into a load without a
battery. Proprietary thermal-regulation circuitry limits
the die temperature when fast-charging or while
exposed to high ambient temperatures, allowing maxi­mum charging current without damaging the IC.

The MAX8804Y/MAX8804Z achieve high flexibility by
providing an adjustable DC/USB fast-charge current
through a simple single-wire interface (SET input). The
chargers automatically select between either a USB or
AC adapter input source. The AC adapter charge cur­rent is programmable from 400mA to 700mA in 50mA
steps through a serial interface. The USB charge cur­rent is programmable to 95mA, 380mA, or 475mA
through the same interface. Other features include an
active-low battery charging-status indicator (CHG), an
active-low power-OK indicator (POK), and an active-low
USB input detection output (USBPWR).

The MAX8804Y/MAX8804Z accept a 4.15V to 30V DC
source voltage or a 4.15V to 16V USB input voltage, but
disable charging when either input voltage exceeds

7.5V to protect against unqualified or faulty input
sources. The MAX8804Y/MAX8804Z operate over the
extended temperature range (-40°C to +85°C) and are
available in a tiny 8-pin thermally enhanced 2mm x
3mm TDFN package.

Applications

Cell Phones/Smartphones

Digital Cameras

Portable Media Players

MP3 Players

Other Handheld Devices

Features

♦ Complete Chargers for Single-Cell Li+ Battery
♦ Dual-Input, 30V AC Adapter/16V USB
♦ No External FET, Blocking Diode, or Sense

Resistor Required

♦ Automatic USB/AC Adapter Input Selection
♦ Easy Programmable Fast-Charge Current and

Top-Off Threshold

♦ Proprietary Die Temperature Regulation Control
♦ ±5% Fast-Charge Current-Limit Accuracy
♦ Power-Present and Charger-Status Outputs
♦ No Prequalification Charge (MAX8804Y)
♦ Tiny 2mm x 3mm Thermally Enhanced TDFN

Package

♦ USB Charging Protected by US Patent #6,507,172

MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

________________________________________________________________

Maxim Integrated Products

1

19-0785; Rev 0; 4/07

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.

Ordering Information

*

EP = Exposed paddle.

+

Denotes a lead-free package.

Note: All devices are specified to operate over the -40°C to
+85°C operating temperature range.

Pin Configuration appears at end of data sheet.

DC

GND

USB

SET

CHG

POK

USBPWR

BAT

+3.3V

AC

ADAPTER

USB

PORT

ENABLE/DISABLE

AND PROGRAMMING

Li+

1μF

2.2μF

MAX8804Y
MAX8804Z

1μF

Typical Application Circuit

PART

MAX8804YETA+ 8 TDFN-EP* T823+1 AAD

MAX8804ZETA+ 8 TDFN-EP* T823+1 AAC

PIN­PACKAGE

PKG

CODE

TOP

MARK

MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

((VDC= 5V, V

SET

= 0V) or (V

USB

= 5V, V

SET

= 5V), V

BAT

= unconnected, TA= -40°C to +85°C, unless otherwise noted.) (Note 1)

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 to GND .............................................................-0.3V to +30V

USB to GND ...........................................................-0.3V to +16V

BAT, CHG, SET, POK, USBPWR to GND ..............-0.3V to +5.5V

Continuous Power Dissipation (T

A

= +70°C)
8-Pin TDFN 2mm x 3mm (derate 16.7mW/°C above +70°C)

(multilayer board) .......................................................1333mW

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

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

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

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

DC AND USB

DC Input Voltage Range 028V

USB Input Voltage Range 014V

Input Operating Range (Notes 2, 3) 4.15 7.00 V

Input Undervoltage Threshold VIN rising, 500mV hysteresis (typ) (Note 2) 3.85 4.0 4.15 V

Input Overvoltage Threshold VIN rising, 200mV hysteresis (typ) (Note 2) 7.2 7.5 7.8 V

USB Input Supply Current

DC to BAT On-Resistance VDC = 3.7V, V

USB to BAT On-Resistance V

Input to BAT Comparator
Threshold (Note 2)

BAT

BAT Regulation Voltage I

Battery Removal Detection
Threshold

DC Charging Current

PARAMETER CONDITIONS MIN TYP MAX UNITS

V

= 0V, I

USB

V

= 5V, standby mode 300 550DC Input Supply Current

SET

= V

V

DC

BAT

VDC = 0V, V

V

SET

V

USB

USB

VIN rising 145 260 385

falling 55

V

IN

BAT

V

BAT

Hysteresis 0.1

V

USB

V

BAT

rising edge detection
on SET

SET

= 0V, standby mode 300 550

= V

BAT

= 3.7V, V

= 0mA

rising 4.40 4.67 4.90

= 0V,

= 3.6V,

= 0mA, charge mode 800 1200

BAT

= 4.3V, shutdown mode 300 550

= 5V, I

BAT

= 4.3V, shutdown mode 300 550

= 3.6V 0.55 1.0 Ω

BAT

= 3.6V 0.65 1.2 Ω

BAT

= 0mA, charge mode 800 1200

TA = +25°C 4.179 4.200 4.221

T

= -40°C to +85°C 4.158 4.200 4.242

A

Default and 1st to 3rd interface
pulse

4th to 7th interface pulse 523 550 578

8th to 11th interface pulse 570 600 630

12th to 15th interface pulse 428 450 473

16th to 19th interface pulse 380 400 420

20th to 23rd interface pulse 618 650 683

24th to 27th interface pulse 665 700 735

475 500 525

µA

µA

mV

V

V

mA

MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

((VDC= 5V, V

SET

= 0V) or (V

USB

= 5V, V

SET

= 5V), V

BAT

= unconnected, TA= -40°C to +85°C, unless otherwise noted.) (Note 1)

Soft-Start Time Ramping time from 0 to 500mA 250 µs

BAT Prequal Threshold MAX8804Z only, V

BAT Prequal Charge Current MAX8804Z only 95 mA

BAT Leakage Current VDC = V

SET

Logic Input Thresholds

Logic-High Time Pulse width required to program DC charge current 1 1000 µs

Logic-Low Time Pulse width required to program USB charge current 1 1000 µs

SET DC Mode Shutdown Delay V

SET USB Mode Shutdown Delay VDC = 0V, V

SET Internal Pulldown Resistor 24MΩ

POK, CHG, USBPWR

Logic Output-Voltage Low I

Logic Output-Current High

CHG

PARAMETER CONDITIONS MIN TYP MAX UNITS

V

= 0V,

DC

= 3.6V, rising

V

BAT

edge detection on SET

= 0V, V

USB

V

rising 1.6

SET

falling 0.4

V

SET

= 0V, VDC = 5V, measured from V

USB

= 5V, measured from V

USB

= I

= V

= I

CHG

CHG

= 5.5V,

= 0V

USB

USBPWR

=

POK

V

POK

V

USBPWR

V

= V

DC

Default 90 95 100

1st interface pulse 360 380 400USB Charging Current

2nd interface pulse 450 475 500

rising, 300mV hysteresis (typ) 2.35 2.50 2.65 V

BAT

= 4.2V 2 µA

BAT

low to high 1.5 2 2.5 ms

SET

high to low 1.5 2 2.5 ms

SET

= 5mA 60 500 mV

TA = +25°C 0.001 1

T

= +85°C 0.01

A

VDC = 0V, V

= 5V 60 80 100

USB

Default, 4th, 8th,
12th, 16th, 20th,
24th, 28th interface

60 80 100

pulse

mA

V

µA

CHG Top-Off Threshold

I

falling, battery is

BAT

charged, rising edge
on SET

V
V

DC

USB

= 5V,

= 0V

1st, 5th, 9th, 13th,
17th, 21st, 25th
interface pulse

2nd, 6th, 10th,
14th, 18th, 22nd,
26th interface pulse

3rd, 7th, 11th, 15th,
19th, 23rd, 27th
interface pulse

67.5 90 112.5

75 100 125

52.7 70 87.5

mA

MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

((VDC= 5V, V

SET

= 0V) or (V

USB

= 5V, V

SET

= 5V), V

BAT

= unconnected, TA= -40°C to +85°C, unless otherwise noted.) (Note 1)

Note 1: Devices are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design

and characterization.

Note 2: V

IN

refers to the input for the IC. For the MAX8804Y/MAX8804Z, VINis VDCwith V

USB

= 0V or V

USB

with VDC= 0V.

Note 3: Guaranteed by undervoltage and overvoltage threshold testing. For charge completion, the input voltage must be greater

than 4.28V.

Note 4: This hysteresis is for all charge current except 95mA. In the case of 95mA charge current, voltage-mode to current-mode

detection gives indication of charge mode.

SUPPLY CURRENT vs. INPUT VOLTAGE

(DC CHARGING MODE)

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

MAX8804Y/Z toc01

036912151821242730

0

0.2

0.4

0.6

0.8

1.0

SUPPLY CURRENT vs. INPUT VOLTAGE

(USB CHARGING MODE)

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

MAX8804Y/Z toc02

0246810121416

0

0.2

0.4

0.6

0.8

1.0

DISABLED-MODE SUPPLY CURRENT

vs. INPUT VOLTAGE (DC CHARGING MODE)

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

MAX8804Y/Z toc03

0 5 10 15 20 25 30

0

0.2

0.4

0.6

0.8

Typical Operating Characteristics

(V

BAT

= 3.6V; DC charge mode: VDC= 5V, V

USB

= 0V, V

SET

= 0V or unconnected; USB charge mode: V

USB

= 5V, VDC= 0V, V

SET

=

5V; TA= +25°C, unless otherwise noted.)

CHG Hysteresis

CHG Detection Delay I

THERMAL LOOP

Thermal-Regulation Set Point

Thermal-Regulation Gain

PARAMETER CONDITIONS MIN TYP MAX UNITS

I

rising after top-off

BAT

is detected (Note 4)

falls below top-off threshold 3 4 5 ms

BAT

Junction temperature when the charge current is reduced,
T

rising

J

Reduction of I
increase of T

BAT

J USB charging -24

DC mode 57

USB mode 51

DC charging -40

for

+105 °C

mA

mA/°C

MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

_______________________________________________________________________________________

5

Typical Operating Characteristics (continued)

(V

BAT

= 3.6V; DC charge mode: VDC= 5V, V

USB

= 0V, V

SET

= 0V or unconnected; USB charge mode: V

USB

= 5V, VDC= 0V, V

SET

=

5V; TA= +25°C, unless otherwise noted.)

STANDBY-MODE SUPPLY CURRENT

vs. INPUT VOLTAGE (USB CHARGING MODE)

0.8

0.6

0.4

SUPPLY CURRENT (mA)

0.2

0

0246810121416

INPUT VOLTAGE (V)

CHARGE CURRENT

vs. DC INPUT VOLTAGE

600

500

400

600

500

MAX8804Y/Z toc04

400

300

200

CHARGE CURRENT (mA)

100

0

120

MAX8804Y/Z toc07

90

CHARGE CURRENT vs. BATTERY VOLTAGE

(DC CHARGING MODE)

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

BATTERY VOLTAGE (V)

CHARGE CURRENT

vs. USB INPUT VOLTAGE

200

160

MAX8804Y/Z toc05

120

80

CHARGE CURRENT (mA)

40

0

V

SET

MAX8804Y/Z toc08

CHARGE CURRENT vs. BATTERY VOLTAGE

(USB CHARGING MODE)

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

BATTERY VOLTAGE (V)

CHARGE CURRENT vs. SET PULSE

(USB CHARGING MODE)

MAX8804Y/Z toc09

MAX8804Y/Z toc06

1V/div

300

200

CHARGE CURRENT (mA)

100

0

0 5 10 15 20 25 30

INPUT VOLTAGE (V)

CHARGE CURRENT vs. SET PULSE

V

SET

700mA

I

CHG

500mA

(DC CHARGING MODE)

600mA

550mA

450mA

400mA

2ms/div

60

CHARGE CURRENT (mA)

30

0

0246810121416

INPUT VOLTAGE (V)

MAX8804Y/Z toc10

1V/div

700mA

650mA

200mA/div

500mA

475mA

I

CHG

95mA 95mA

CHARGE CURRENT

vs. INPUT VOLTAGE HEADROOM

600

INPUT VOLTAGE DECREASING

500

400

300

200

CHARGE CURRENT (mA)

100

0

0 100 200 300 400 500

INPUT VOLTAGE HEADROOM (mV)

DC MODE

USB MODE

475mA

380mA 380mA

2ms/div

MAX8804Y/Z toc11

475mA

200mA/div

95mA