MAXIM MAX8804W, MAX8804Y, MAX8804Z Technical data

General Description

The MAX8804W/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 MAX8804W/MAX8804Z function as stand-alone
chargers to control the charging sequence from the pre­qualification state through fast-charge, top-off charge,
and full-charge 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), an active-low
USB input detection output (USBPWR) on the
MAX8804Y/MAX8804Z, and battery pack detection
(DETBAT) on the MAX8804W.

The MAX8804W/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 MAX8804W/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
♦ Battery Pack Detection Input (MAX8804W)
♦ 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

MAX8804W/MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

________________________________________________________________

Maxim Integrated Products

1

19-0785; Rev 1; 10/07

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.

EVALUATION KIT

AVAILABLE

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

MAX8804W

MAX8804Y
MAX8804Z

1μF

(DETBAT)

NOTE: () FOR MAX8804W, <> FOR MAX8804Y/MAX8804Z

Typical Application Circuit

PART

MAX8804WETA+ 8 TDFN-EP* T823+1 AAP

MAX8804YETA+ 8 TDFN-EP* T823+1 AAD

MAX8804ZETA+ 8 TDFN-EP* T823+1 AAC

PIN­PACKAGE

PKG

CODE

TOP

MARK

MAX8804W/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, V

DETBAT

= 0V (MAX8804W), 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, DETBAT

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

PARAMETER CONDITIONS MIN TYP MAX UNITS

V

V

V

VDC = 0V, V

V

V

VIN rising 145 260 385

V

BAT

V

Hysteresis 0.1

= 0V, I

USB

SET

= V

DC

SET

USB

USB

falling 55

IN

= 0mA

BAT

BAT

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

= 4.3V, shutdown mode 300 550

BAT

SET

= 0V, standby mode 300 550

= V

= 4.3V, shutdown mode 300 550

BAT

= 3.7V, V

rising 4.40 4.67 4.90

= 0mA, charge mode 800 1200

= 5V, I

BAT

= 3.6V 0.55 1.0 Ω

BAT

= 3.6V 0.65 1.2 Ω

BAT

TA = +25°C 4.179 4.200 4.221

T

= 0mA, charge mode 800 1200

= -40°C to +85°C 4.158 4.200 4.242

A

µA

µA

mV

V

V

MAX8804W/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, V

DETBAT

= 0V (MAX8804W), TA= -40°C to +85°C, unless

otherwise noted.) (Note 1)

DC Charging Current

USB Charging Current

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

BAT Prequal Threshold

BAT Prequal Charge Current MAX8804W/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

PARAMETER CONDITIONS MIN TYP MAX UNITS

V
V
rising edge detection
on SET
(MAX8804Y/
MAX8804Z)

V
V
edge detection on SET
(MAX8804W)

V
V
edge detection on SET
(MAX8804Y/
MAX8804Z)

V
V
edge detection on SET
(MAX8804W)

MAX8804W/MAX8804Z only, V
hysteresis (typ)

V

V

= 0V,

USB

= 3.6V,

BAT

= 0V,

USB

= 3.6V, rising

BAT

= 0V,

DC

= 3.6V, rising

BAT

= 0V,

DC

= 3.6V, rising

BAT

= 0V, V

USB

rising 1.6

SET

falling 0.4

SET

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

USB

USB

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

Default and 1st to 3rd interface
pulse

4th to 7th interface pulse 523 550 578

8th to 11th interface pulse 475 500 525

12th to 15th interface pulse 380 400 420

16th to 19th interface pulse 570 600 630

20th to 23th interface pulse 618 650 683

24th to 27th interface pulse 665 700 735

Default 90 95 100

1st interface pulse 360 380 400

2nd interface pulse 450 475 500

Default 360 380 400

1st interface pulse 450 475 500

2nd interface pulse 90 95 100

rising, 300mV

BAT

= 4.2V 2 µA

BAT

SET

= 5V, measured from V

SET

475 500 525

428 450 473

2.35 2.50 2.65 V

low to high 1.5 2 2.5 ms

high to low 1.5 2 2.5 ms

mA

mA

V

MAX8804W/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, V

DETBAT

= 0V (MAX8804W), 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 MAX8804W/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.

POK, CHG, USBPWR (USBPWR only for MAX8804Y/MAX8804Z)

Logic Output-Voltage Low I

Logic Output-Current High

DETBAT (MAX8804W only)

Logic Input Theshold

Pullup Resistor 63 kΩ

CHG

PARAMETER CONDITIONS MIN TYP MAX UNITS

= I

POK

V

POK

V

USBPWR

V

= V

DC

= V

= I

CHG

CHG

= 5.5V,

= 0V

USB

=

= 5mA 60 500 mV

USBPWR

TA = +25°C 0.001 1

T

= +85°C 0.01

A

Rising 1.6

Falling 0.4

VDC = 0V, V

= 5V 60 80 100

USB

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

60 80 100

pulse

µA

V

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

67.5 90 112.5

CHG Top-Off Threshold

I

falling, battery is

BAT

charged, rising edge
on SET

V
V

DC

USB

= 5V,

= 0V

2nd, 6th, 10th,
14th, 18th, 22nd,

75 100 125

26th interface pulse

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

CHG Hysteresis

CHG Detection Delay I

I

rising after top-off

BAT

is detected (Note 4)

falls below top-off threshold 3 4 5 ms

BAT

DC mode 57

USB mode 51

interface pulse

52.7 70 87.5

THERMAL LOOP

Thermal-Regulation Set Point

Thermal-Regulation Gain

Junction temperature when the charge current is reduced,
T

rising

J

DC charging -40

J

BAT

for

USB charging -24

Reduction of I
increase of T

+105 °C

mA

mA

mA/°C

MAX8804W/MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(V

BAT

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

USB

= 0V, V

DETBAT

= 0V (only for MAX8804W), 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)

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

MAX8804Y/Z toc04

0246810121416

0

0.2

0.4

0.6

0.8

CHARGE CURRENT vs. BATTERY VOLTAGE

(DC CHARGING MODE)

BATTERY VOLTAGE (V)

CHARGE CURRENT (mA)

MAX8804Y/Z toc05

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

0

100

200

300

400

500

600

CHARGE CURRENT vs. BATTERY VOLTAGE

(USB CHARGING MODE)

BATTERY VOLTAGE (V)

CHARGE CURRENT (mA)

MAX8804Y/Z toc06

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

0

40

80

120

160

200

SUPPLY CURRENT vs. INPUT VOLTAGE

1.0

0.8

0.6

0.4

SUPPLY CURRENT (mA)

0.2

0

036912151821242730

DISABLED-MODE SUPPLY CURRENT

vs. INPUT VOLTAGE (DC CHARGING MODE)

0.8

0.6

(DC CHARGING MODE)

MAX8804Y/Z toc01

INPUT VOLTAGE (V)

MAX8804Y/Z toc03

SUPPLY CURRENT vs. INPUT VOLTAGE

1.0

0.8

0.6

0.4

SUPPLY CURRENT (mA)

0.2

0

(USB CHARGING MODE)

MAX8804Y/Z toc02

0246810121416

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

0.4

0.2

0

0 5 10 15 20 25 30

INPUT VOLTAGE (V)

CHARGE CURRENT

vs. AMBIENT TEMPERATURE

AMBIENT TEMPERATURE (°C)

CHARGE CURRENT (mA)

MAX8804Y/Z toc13

-40 -15 10 35 60 85

200

300

400

500

600

700

DC CHARGE MODE 650mA

BATTERY REGULATION VOLTAGE

vs. LOAD CURRENT

LOAD CURRENT (mA)

BATTERY REGULATION VOLTAGE (V)

MAX8804Y/Z toc14

0 100 200 300 400 500 600 700

4.10

4.15

4.20

4.25

4.30

550mA CHARGE-CURRENT SETTING

BATTERY REGULATION VOLTAGE

vs. AMBIENT TEMPERATURE

AMBIENT TEMPERATURE (°C)

BATTERY REGULATION VOLTAGE (V)

MAX8804Y/Z toc12

-40 -15 10 35 60 85

4.180

4.186

4.192

4.198

4.204

4.210

USB MODE

DC MODE

MAX8804W/MAX8804Y/MAX8804Z

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

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V

BAT

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

USB

= 0V, V

DETBAT

= 0V (only for MAX8804W), V

SET

= 0V or unconnected; USB charge

mode: V

USB

= 5V, VDC= 0V, V

SET

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

CHARGE CURRENT

vs. DC INPUT VOLTAGE

600

120

CHARGE CURRENT

vs. USB INPUT VOLTAGE

CHARGE CURRENT vs. SET PULSE

(USB CHARGING MODE) (MAX8804Y/MAX8804Z)

MAX8804Y/Z toc09

500

400

300

200

CHARGE CURRENT (mA)

100

0

0 5 10 15 20 25 30

INPUT VOLTAGE (V)

CHARGE CURRENT vs. SET PULSE

(DC CHARGING MODE) (MAX8804Y/MAX8804Z)

V

SET

700mA

I

CHG

500mA

550mA

600mA

450mA

650mA

400mA

MAX8804Y/Z toc10

700mA

2ms/div

500mA

MAX8804Y/Z toc07

1V/div

200mA/div

90

60

CHARGE CURRENT (mA)

30

0

0246810121416

INPUT VOLTAGE (V)

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

V

MAX8804Y/Z toc08

I

CHG

MAX8804Y/Z toc11

SET

475mA

475mA

380mA 380mA

95mA 95mA

2ms/div

1V/div

475mA

200mA/div

95mA

MAX8804W/MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

_______________________________________________________________________________________ 7

Pin Description

PIN

MAX8804W

1 1 BAT

2 — DETBAT

—2USBPWR

33POK

44DC

5 5 USB

66CHG

7 7 SET

8 8 GND Ground

— — EP Exposed Paddle. Connect to the GND plane for optimum thermal dissipation.

MAX8804Y/

MAX8804Z

NAME FUNCTION

Battery Connection. The IC delivers charging current and monitors battery voltage
using BAT. Bypass BAT to GND with a 2.2µF or larger ceramic capacitor. BAT is high
impedance when the IC is disabled.

Battery Pack Detection Input. Drive DETBAT low or connect it to GND to allow SET to
control the charger. Leave DETBAT unconnected to disable any charge mode.

USB Input Detection Output. USBPWR is internally pulled low if a valid voltage is
present at USB, otherwise it is high impedance. USBPWR circuitry is active regardless
of SET and charger on/off status.

Power-OK Monitor. POK is an open-drain output that is internally pulled low when a
valid charging source is detected at either DC or USB. POK is high impedance when
both input voltages are less than V

DC Input Supply. Connect DC to a 4.15V to 7V charging source. Bypass DC to GND
with a 1µF or larger ceramic capacitor. DC takes priority over USB when both are valid.

USB Input Source. Connect USB to a USB port. Bypass USB to GND with a 1µF or
larger ceramic capacitor.

Charging-Status Output. CHG is internally pulled low when the battery is being
charged. CHG is high impedance when the charger is in top-off mode or disabled.

Enable/Disable, Charging Current, and Top-Off Threshold Set Input. Drive SET low to
enable DC charge mode and drive high to enable USB charge mode. If both DC and
USB inputs are present, SET is used for the DC charge mode only and USB charge is
disabled. SET is also used for programming the charge current and top-off threshold.
See the DC/USB Mode and Charging Current Setting section for details.

UVLO

or V

BAT

.

MAX8804W/MAX8804Y/MAX8804Z

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

8 _______________________________________________________________________________________

Detailed Description

The MAX8804W/MAX8804Y/MAX8804Z dual-input linear
battery chargers use voltage, current, and thermal-con­trol loops to charge and protect a single Li+ battery.
When a Li+ battery with a cell voltage below 2.5V is
inserted, the MAX8804W/MAX8804Z chargers enter the
prequalification stage where they precharge that cell
with 95mA (Figure 2). The CHG indicator output is dri­ven low to indicate entry into the prequalification state.
When battery voltage exceeds 2.5V, the charger soft­starts as it enters the fast-charge stage. The MAX8804Y
eliminates the prequalification state and enters fast­charge when the battery is inserted. The fast-charge cur­rent level is programmed by a simple single-wire

interface. As the battery voltage approaches 4.2V, the
charging current is reduced. If the battery current drops
below the top-off current threshold, the CHG indicator
goes high impedance, signaling that the battery is fully
charged. The ICs then enter a constant voltage-regula­tion mode to maintain the battery at full charge.

The MAX8804W/MAX8804Y/MAX8804Z 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 simple single­wire interface (see Tables 2 and 3). The USB charge cur­rent is programmable to 95mA, 380mA, or 475mA
through the same interface (see Tables 4 and 5).

Figure 1. Functional Diagram

4.15V TO 30V

4.15V TO 16V

USB

DC

MAX8804Y
MAX8804Z

DC

POK

USB
POK

DC AND USB OUTPUT CONTROL

VOLTAGE

LOGIC

CONTROL

BAT

Li+

+105°C

TEMP

SENSOR

LOOP

OVERVOLTAGE

PROTECTION

(DETBAT)

SET

CHG

POK

<USBPWR>

REF

BIAS

CIRCUIT

GND

NOTE: ( ) FOR MAX8804W ONLY
< > FOR MAX8804Y/MAX8804Z ONLY

MAX8804W/MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

_______________________________________________________________________________________ 9

DC Charging

The MAX8804W/MAX8804Y/MAX8804Z are designed
to charge a single-cell Li+ battery from a DC source
voltage between 4.15V and 7V and withstand up to 30V
maximum input voltage. The charge current and top-off
threshold are programmed with the SET input.

USB Charging

The MAX8804W/MAX8804Y/MAX8804Z contain a USB
input that allows operation from a USB port with voltages
between 4.15V and 7V and can withstand up to 16V max­imum input voltage. Pulsing SET allows programming a
95mA, 380mA, or 475mA maximum charging current
when using the USB input.

Figure 2. Charger State Diagram

ASYNCHRONOUS
FROM ANYWHERE

= HIGH > 2ms

t

SET

FOR DC MODE

= LOW > 2ms

t

SET

FOR USB MODE

< 2.5V

V

BAT

STANDBY MODE

CHARGER = OFF

POK = LOW

CHG = HIGH IMPEDANCE

t

SET

POK = LOW
CHG = LOW

FOR DC MODE
t

SET

FOR USB MODE

MAX8804W/
MAX8804Z

PREQUALIFICATION

DEFAULT CHARGE CURRENT

V

< 2.2V

BAT

MAX8804W/
MAX8804Z

= LOW > 2ms

= HIGH > 2ms

> 2.5V

V

BAT

< VIN < V

V

UVLO

AND VIN > V

BAT

OVP

SHUTDOWN

CHARGER = OFF

POK = HIGH IMPEDANCE*

CHG = HIGH IMPEDANCE

VIN < V
OR V
OR V
OR DETBAT = HIGH

MAX8804Y

= LOW > 2ms

t

SET

FOR DC MODE

= HIGH > 2ms

t

SET

FOR USB MODE

IN
BAT

UVLO

> V

> V

OVP

ASYNCHRONOUS
FROM ANYWHERE

< V

V

IN

IN

OR VIN > V
OR V

BAT

OR DETBAT = HIGH

UVLO

> V

OVP

IN

FAST-CHARGE

100% CHARGE CURRENT

POK = LOW
CHG = LOW

I

> I

TOP-OFF

+ 57mA FOR ALL

I

CHG

FULL BAT

= 4.2V

V

BAT

POK = LOW

CHG = HIGH IMPEDANCE

< I

TOP-OFF

CHG

FAST-CHARGE OPTIONS EXCEPT 95mA

CV MODE TO CC MODE FOR 95mA
FAST-CHARGE OPTION

*POK = LOW WHEN VIN > V

OVP

MAX8804W/MAX8804Y/MAX8804Z

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

10 ______________________________________________________________________________________

DC/USB Mode and

Charging Current Setting

SET is a logic input that sets DC/USB charging mode
and charging current. Drive SET low or leave it uncon­nected to enable DC charging mode. Drive SET high to
enable USB charging mode (see Table 1). SET can
also be driven by series pulses to program the charg­ing current in both DC and USB mode.

DC Charge Mode

Drive SET low or leave it unconnected to enable DC
charging mode. Subsequent pulses on SET program
the charging current and the top-off threshold. There
are seven fast-charge current options and four top-off
threshold options. Default fast-charge current and top­off threshold current are 500mA and 80mA. Pulse SET
high (1µs to 1ms pulse width) subsequently to realize
charging current and top-off threshold programming
and transition. After the 28th pulse, the MAX8804W/
MAX8804Y/MAX8804Z go into the default mode and
start a new cycle. See Tables 2 and 3 and Figure 3 to
set the desired charging current and top-off threshold.
Drive SET high longer than 2ms to disable the DC
charging-control circuitry.

Table 1. SET Truth Table

Table 2. MAX8804Y/MAX8804Z DC Charging Current Programming by Series Pulses

Table 3. MAX8804W DC Charging Current Programming by Series Pulses

Note: This table is true when DETBAT = LOW for the MAX8804W.

When DETBAT = HIGH, the MAX8804W enters shutdown.

SET V

0 Invalid Invalid Off

0 Invalid Valid Off

0 Valid Invalid

0 Valid Valid

1 Invalid Invalid Off

1 Invalid Valid

1 Valid Invalid Off

1 Valid Valid Off

DC

V

USB

CHARGER STATUS

DC charging mode enabled,
USB charging mode disabled

DC charging mode enabled,
USB charging mode disabled

DC charging mode disabled,
USB charging mode enabled

PULSE

NUMBER

I

(mA) 500 500 500 500 550 550 550 550 600 600 600 600 450 450 450

CHG

Top - O ff C ur r ent
Thr eshol d ( m A)

PULSE

NUMBER

I

(mA) — 450 400 400 400 400 650 650 650 650 700 700 700 700 500

CHG

Top - O ff C ur r ent
Thr eshol d ( m A)

DEFAULT 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th

80 90 100 70 80 90 100 70 80 90 100 70 80 90 100

— 15th 16th 17th 18th 19th 20th 21st 2 2 n d 2 3 r d 24th 25th 26th 27th 28th

— 70 80 90 100 70 80 90 100 70 80 90 100 70 80

PULSE

NUMBER

I

(mA) 450 450 450 450 550 550 550 550 500 500 500 500 400 400 400

CHG

Top - O ff C ur r ent
Thr eshol d ( m A)

PULSE

NUMBER

I

(mA) — 400 600 600 600 600 650 650 650 650 700 700 700 700 450

CHG

Top - O ff C ur r ent
Thr eshol d ( m A)

DEFAULT 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th

80 90 100 70 80 90 100 70 80 90 100 70 80 90 100

— 15th 16th 17th 18th 19th 20th 21st 2 2 n d 2 3 r d 24th 25th 26th 27th 28th

— 70 80 90 100 70 80 90 100 70 80 90 100 70 80

MAX8804W/MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

______________________________________________________________________________________ 11

USB Charge Mode

Drive SET high to enable USB charging mode when the
USB input is valid. Subsequent low pulses with 1µs to
1ms pulse width on SET program the fast charging cur­rent from 95mA, 380mA, to 475mA and then repeat
new cycle as shown in Tables 4 and 5. Drive SET low or
leave it unconnected longer than 2ms to disable USB
charging-control circuitry.

Table 4. MAX8804Y/MAX8804Z USB
Charging Current Programming by Series
Pulses

POK

Figure 3. DC Charging Current and Top-Off Threshold Programming

Table 5. MAX8804W USB Charging
Current Programming by Series Pulses

SET

I

CHG

DC

234 2425262728

1

> 2ms

t

HIGH

2ms

DELAY

0mA

t

SOFTSTART

500mA

(450mA)

550mA

(550mA)

700mA
(700mA)

500mA

(450mA)

0mA

TOP-OFF

CURRENT

THRESHOLD

NOTE: ( ) FOR MAX8804W

80mA

90mA

100mA

70mA

80mA

100mA

80mA

90mA

70mA

80mA

PULSE NUMBER DEFAULT 1st 2nd 3rd

I

(mA) 95 380 475 95

CHG

Top-Off Current
Threshold (mA)

80 80 80 80

PULSE NUMBER DEFAULT 1st 2nd 3rd

I

(mA) 380 475 95 380

CHG

Top-Off Current
Threshold (mA)

80 80 80 80

MAX8804W/MAX8804Y/MAX8804Z

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

12 ______________________________________________________________________________________

Soft-Start

The soft-start circuitry activates when entering fast­charge mode. In the MAX8804Y, soft-start is entered
directly after being enabled, and the charging current
ramps up in 250µs from 0 to 500mA (95mA in USB
mode). This reduces the inrush current on the input
supply. Note that the MAX8804W/MAX8804Z has a pre­qualification state and the charging current ramps up
when the prequalification state is complete (V

BAT

exceeds 2.5V).

Thermal Regulation Control

The thermal-regulation loop limits the MAX8804W/
MAX8804Y/MAX8804Z die temperature to +105°C by
reducing the charge current as necessary. This feature
not only protects the ICs from overheating, but also
allows a higher charge current at room temperature
without risking damage to the system.

Charging-Status Output (

CHG

)

CHG is an open-drain output that indicates charger sta­tus. CHG goes low during charge cycles where the
MAX8804W/MAX8804Y/MAX8804Z are in prequalifica­tion or fast-charge mode. CHG goes high impedance
when the charge current reaches the top-off threshold
for more than 4ms, indicating charging is done. The
CHG status is latched after the top-off threshold is
reached. The latch is reset by toggling the SET input,
recycling input power, or increasing the charging cur­rent to the top-off threshold plus 57mA (typ).

When the MAX8804W/MAX8804Y/MAX8804Z are used
in conjunction with a microprocessor (µP), connect a
pullup resistor between CHG and the logic I/O voltage
to indicate charge status to the µP. Alternatively, CHG
can sink up to 5mA for an LED charge indicator.

Figure 4. USB Charging Current Programming

USB

POK

USBPWR

1

SET

t

LOW

2ms

t

SOFTSTART

DELAY

MAX8804Y/
MAX8804Z

I

CHG

0mA

MAX8804W

I

CHG

0mA

TOP-OFF

CURRENT

THRESHOLD

95mA

380mA

380mA

475mA

2

475mA

95mA

80mA

3

95mA

380mA

> 2ms

0mA

0mA

MAX8804W/MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

______________________________________________________________________________________ 13

Power-OK Monitor (

POK

)

The MAX8804W/MAX8804Y/MAX8804Z contain an
open-drain POK output that goes low when a valid input
source is detected at either DC or USB. A valid input
source is one whose voltage is greater than 4.15V and
exceeds the battery voltage by 250mV. After a valid
input has been established, charging is sustained with
inputs as low as 3.5V as long as the input voltage
remains above the battery voltage by at least 40mV.
POK status is maintained regardless of SET status.

When the MAX8804W/MAX8804Y/MAX8804Z are used
in conjunction with a µP, connect a pullup resistor
between POK and the logic I/O voltage to indicate
power-OK to the µP. Alternatively, POK can sink up to
5mA for an LED power-OK indicator.

USB Power Status Output (

USBPWR

)

(MAX8804Y/MAX8804Z Only)

USBPWR is internally pulled low when V

USB

> V

UVLO

and V

USB

- V

BAT

> 250mV. Otherwise, it is high imped-

ance. USBPWR indicates the USB input presence
regardless of SET status and charger status.

When the MAX8804Y/MAX8804Z are used in conjunction
with a µP, connect a pullup resistor between USBPWR
and the logic I/O voltage to indicate USB power status
to the µP. Alternatively, USBPWR can sink up to 5mA
for an LED USB power status indicator.

Battery Pack Dectection Input

(DETBAT, MAX8804W Only)

DETBAT is pulled up to an internal 3V supply through a
63kΩ resistor. Driving DETBAT low or connecting it to
GND allows SET to control the charger. When DETBAT
is left unconnected, the MAX8804W enters shutdown.

Applications Information

Capacitor Selection

Connect a 2.2µF ceramic capacitor from BAT to GND for
proper stability. Connect a 1µF ceramic capacitor from
DC to GND. If using the USB input, bypass USB to GND
with a 1µF ceramic capacitor. Use a larger input bypass
capacitor for high charging currents to reduce supply
noise. All capacitors should be X5R dielectric or better.
Be aware that some capacitors have large voltage and
temperature coefficients and should be avoided.

Thermal Considerations

The MAX8804W/MAX8804Y/MAX8804Z are available in
a thermally enhanced TDFN package with an exposed
paddle. Connect the exposed paddle to a large copper

ground plane to provide a thermal contact between the
device and the PCB for increased power dissipation.
The exposed paddle transfers heat away from the
device, allowing the IC to charge the battery with maxi­mum current, while minimizing the die temperature
increase.

Input Sources

The MAX8804W/MAX8804Y/MAX8804Z operate from
well-regulated input sources. The operating input volt­age range is 4.15V to 7V. The device survives DC input
supply voltages up to 30V and USB input source volt­ages up to 16V without damage to the IC. If the input
voltage is greater than 7.5V (typ), the IC stops charg­ing. An appropriate power supply must provide at least

4.2V plus the voltage drop across the internal pass
transistor when sourcing the desired maximum charg­ing current:

V

IN(MIN)

> 4.2V + I

CHARGE(MAX)

x R

ON

where RONis the input-to-BAT resistance (typically

0.55Ω for DC or 0.65Ω for USB). Failure to meet this
requirement results in an incomplete charge or
increased charge time.

Application Circuits

Stand-Alone Li+ Charger

The MAX8804W/MAX8804Y/MAX8804Z provide a com­plete Li+ charging solution. The

Typical Application

Circuit

shows the MAX8804W/MAX8804Y/MAX8804Z as
a stand-alone Li+ battery charger. The LED indicates
when either fast-charge or prequalification has begun.
When the battery is fully charged, the LED turns off.

Microprocessor-Interfaced Li+ Charger

Figure 5 shows the MAX8804W/MAX8804Y/MAX8804Z
as a µP-interfaced Li+ battery charger. The µP drives
SET to enable/disable DC/USB mode charging. CHG
can be used to detect the charge status of a battery.

Layout and Bypassing

Connect the input capacitors as close as possible to
the IC. Provide a large copper GND plane to allow the
exposed paddle to sink heat away from the IC. Connect
the battery to BAT as close as possible to the IC to pro­vide accurate battery voltage sensing. Make all high­current traces short and wide to minimize voltage
drops. A sample layout is available in the MAX8804Z
evaluation kit to speed designs.

MAX8804W/MAX8804Y/MAX8804Z

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

14 ______________________________________________________________________________________

Figure 5. Microprocessor-Interfaced Li+ Charger with the MAX8804W/MAX8804Y/MAX8804Z

Chip Information

PROCESS: BiCMOS

1

+

34

865

GND CHG USB

MAX8804W

MAX8804Y
MAX8804Z

2

7

SET

BAT POK

DC

USBPWR

TDFN

2mm × 3mm

TOP VIEW

(DETBAT)

() FOR MAX8804W

Pin Configuration

SYSTEM I/O

AC

ADAPTER

USB PORT

1μF

1μF

Li+

2.2μF

DC

USB

(DETBAT)

BAT

MAX8804W

MAX8804Y
MAX8804Z

GND

CHG

POK

<USBPWR>

SET

NOTE: () FOR MAX8804W
<> FOR MAX8804Y/MAX8804Z

μP

MAX8804W/MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

______________________________________________________________________________________ 15

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

8L, TDFN.EPS

PACKAGE OUTLINE
8L TDFN, EXPOSED PAD, 2x3x0.8mm

21-0174

1

B

2

MAX8804W/MAX8804Y/MAX8804Z

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

16 ______________________________________________________________________________________

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

SYMBOL

A
E
D
A1
L
k 0.20 MIN.
A2

e
b

MIN.

0.70

1.95

0.00

0.30

DIMENSIONS

NOM.

0.75

3.002.95

2.00

0.02

0.40

0.20 REF.
8N

0.50 BSC

0.250.18 0.30

MAX.

0.80

3.05

2.05

0.05

0.50

PKG.

CODE
T823-1

MIN.

1.60

EXPOSED PAD PACKAGE
E2

MAX.

1.90

MIN.

1.50

NOM.

1.75

D2

NOM.

1.63

MAX.

1.75

PACKAGE OUTLINE
8L TDFN, EXPOSED PAD, 2x3x0.8mm

21-0174

2

B

2

MAX8804W/MAX8804Y/MAX8804Z

High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________

17

© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

Heaney

Revision History

REVISION

NUMBER

0 4/07 Initial release. —

1 10/07 Added MAX8804W and Battery Pack Detection feature. 1–16

REVISION

DATE

DESCRIPTION

PAGES

CHANGED