MAXIM MAX8804ZETA

19-0785; Rev 2; 4/08
KIT
ATION
EVALU
E
L
B
A
AVAIL
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
The MAX8804V/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.
The MAX8804V/MAX8804W/MAX8804Z function as
stand-alone chargers to control the charging sequence
from the prequalification state through fast-charge, topoff 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 MAX8804V/MAX8804W/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
MAX8804V/MAX8804W.
The MAX8804V has 120mA, 140mA, 180mA, and
200mA CHG top-off threshold settings, while the
MAX8804W/MAX8804Y/MAX8804Z have 70mA, 80mA,
90mA, and 100mA.
The MAX8804V/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 MAX8804V/
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.
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
(MAX8804V/MAX8804W)
♦ Power-Present and Charger-Status Outputs
♦ No Prequalification Charge (MAX8804Y)
♦ Tiny 2mm x 3mm Thermally Enhanced TDFN
Package
Ordering Information
PART
PINPACKAGE
TOP
MARK
MAX8804VETA+
8 TDFN-EP*
AAQ
MAX8804WETA+
8 TDFN-EP*
AAP
MAX8804YETA+
8 TDFN-EP*
AAD
MAX8804ZETA+
8 TDFN-EP*
AAC
*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.
Typical Application Circuit
+3.3V
AC
ADAPTER
DC
1μF
GND
USB
PORT
USB
1μF
Applications
Cell Phones/Smartphones
Digital Cameras
MP3 Players
Other Handheld Devices
Portable Media Players
MAX8804V
MAX8804W
MAX8804Y
MAX8804Z
CHG
POK
<USBPWR>
(DETBAT)
BAT
ENABLE/DISABLE
AND PROGRAMMING
2.2μF
Li+
SET
NOTE: () FOR MAX8804V/MAX8804W, < > FOR MAX8804Y/MAX8804Z
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
General Description
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
ABSOLUTE MAXIMUM RATINGS
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 (TA = +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
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.
ELECTRICAL CHARACTERISTICS
((VDC = 5V, VSET = 0V) or (VUSB = 5V, VSET = 5V), VBAT = unconnected, VDETBAT = 0V (MAX8804V/MAX8804W), TA = -40°C to
+85°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DC AND USB
DC Input Voltage Range
0
28
V
USB Input Voltage Range
0
14
V
(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
800
1200
Input Operating Range
VUSB = 0V, IBAT = 0mA, charge mode
DC Input Supply Current
USB Input Supply Current
VSET = 5V, standby mode
300
550
VDC = VBAT = 4.3V, shutdown mode
300
550
VDC = 0V, VSET = 5V, IBAT = 0mA, charge mode
800
1200
µA
µA
VSET = 0V, standby mode
300
550
VUSB = VBAT = 4.3V, shutdown mode
300
550
DC to BAT On-Resistance
VDC = 3.7V, VBAT = 3.6V
0.55
1.0
Ω
USB to BAT On-Resistance
VUSB = 3.7V, VBAT = 3.6V
0.65
1.2
Ω
Input to BAT Comparator
Threshold (Note 2)
VIN rising
260
385
145
VIN falling
55
mV
BAT
BAT Regulation Voltage
IBAT = 0mA
Battery Removal Detection
Threshold
VBAT rising
DC Charging Current
2
TA = +25°C
4.179
4.200
4.221
TA = -40°C to +85°C
4.158
4.200
4.242
4.40
4.67
4.90
Hysteresis
VUSB = 0V,
VBAT = 3.6V,
rising edge detection on
SET (MAX8804Y/
MAX8804Z)
0.1
Default and 1st to 3rd
interface pulse
475
500
525
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
_______________________________________________________________________________________
V
V
mA
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
((VDC = 5V, VSET = 0V) or (VUSB = 5V, VSET = 5V), VBAT = unconnected, VDETBAT = 0V (MAX8804V/MAX8804W), TA = -40°C to
+85°C, unless otherwise noted.) (Note 1)
PARAMETER
DC Charging Current
USB Charging Current
CONDITIONS
VUSB = 0V,
VBAT = 3.6V,
rising edge detection
on SET (MAX8804V/
MAX8804W)
MIN
TYP
MAX
Default and 1st to 3rd interface
pulse
428
450
473
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
VDC = 0V,
VBAT = 3.6V, rising
edge detection on SET
(MAX8804Y/
MAX8804Z)
Default
90
95
100
1st interface pulse
360
380
400
2nd interface pulse
450
475
500
VDC = 0V,
VBAT = 3.6V, rising
edge detection on SET
(MAX8804V/
MAX8804W)
Default
360
380
400
1st interface pulse
450
475
500
2nd interface pulse
90
95
100
UNITS
mA
mA
Soft-Start Time
Ramping time from 0 to 500mA
BAT Prequal Threshold
MAX8804V/MAX8804W/MAX8804Z only, VBAT rising,
300mV hysteresis (typ)
BAT Prequal Charge Current
MAX8804V/MAX8804W/MAX8804Z only
BAT Leakage Current
VDC = VUSB = 0V, VBAT = 4.2V
250
2.35
2.50
µs
2.65
95
V
mA
2
µA
SET
Logic Input Thresholds
VSET rising
1.6
VSET falling
0.4
V
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
VUSB = 0V, VDC = 5V, measured from VSET low to high
1.5
2
2.5
ms
SET USB Mode Shutdown Delay
VDC = 0V, VUSB = 5V, measured from VSET high to low
1.5
2
2.5
ms
2
4
MΩ
60
500
mV
TA = +25°C
0.001
1
TA = +85°C
0.01
SET Internal Pulldown Resistor
POK, CHG, USBPWR (USBPWR only for MAX8804Y/MAX8804Z)
Logic Output-Voltage Low
I POK = I CHG = I USBPWR = 5mA
Logic Output-Current High
V POK = V CHG =
V USBPWR = 5.5V,
VDC = VUSB = 0V
µA
DETBAT (MAX8804V/MAX8804W only)
Logic Input Theshold
Pullup Resistor
Rising
Falling
1.6
0.4
63
V
kΩ
_______________________________________________________________________________________
3
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
ELECTRICAL CHARACTERISTICS (continued)
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
ELECTRICAL CHARACTERISTICS (continued)
((VDC = 5V, VSET = 0V) or (VUSB = 5V, VSET = 5V), VBAT = unconnected, VDETBAT = 0V (MAX8804V/MAX8804W), TA = -40°C to
+85°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
60
80
100
60
80
100
67.5
90
112.5
2nd, 6th, 10th,
14th, 18th, 22nd,
26th interface pulse
75
100
125
3rd, 7th, 11th, 15th,
19th, 23rd, 27th
interface pulse
52.7
70
87.5
UNITS
CHG
VDC = 0V, VUSB = 5V
Default, 4th, 8th,
12th, 16th, 20th,
24th, 28th interface
pulse
CHG Top-Off Threshold
(MAX8804W/MAX8804Y/
MAX8804Z)
IBAT falling, battery is
charged, rising edge
on SET
VDC = 5V,
VUSB = 0V
1st, 5th, 9th, 13th,
17th, 21st, 25th
interface pulse
VDC = 0V, VUSB = 5V
CHG Top-Off Threshold
(MAX8804V)
IBAT falling, battery is
charged, rising edge
on SET
VDC = 5V,
VUSB = 0V
60
80
100
Default, 4th, 8th,
12th, 16th, 20th,
24th, 28th interface
pulse
90
120
150
1st, 5th, 9th, 13th,
17th, 21st, 25th
interface pulse
105
140
175
2nd, 6th, 10th,
14th, 18th, 22nd,
26th interface pulse
135
180
225
3rd, 7th, 11th, 15th,
19th, 23rd, 27th
interface pulse
150
200
250
DC mode
57
USB mode
51
CHG Hysteresis
IBAT rising after top-off
is detected (Note 4)
CHG Detection Delay
IBAT falls below top-off threshold
3
4
mA
mA
mA
5
ms
THERMAL LOOP
Thermal-Regulation Set Point
Junction temperature when the charge current is reduced,
TJ rising
Thermal-Regulation Gain
Reduction of IBAT for
increase of TJ
+105
DC charging
-40
USB charging
-24
°C
mA/°C
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: VIN refers to the input for the IC. For the MAX8804V/MAX8804W/MAX8804Y/MAX8804Z, VIN is VDC with VUSB = 0V or VUSB
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.
4 _______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
SUPPLY CURRENT vs. INPUT VOLTAGE
(DC CHARGING MODE)
0.6
0.4
0.2
0.4
0
3
6
9 12 15 18 21 24 27 30
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (mA)
0.4
0.2
6
8
10 12
INPUT VOLTAGE (V)
14
0.8
MAX8804Y/Z toc03
0.6
4
16
STANDBY-MODE SUPPLY CURRENT
vs. INPUT VOLTAGE (USB CHARGING MODE)
DISABLED-MODE SUPPLY CURRENT
vs. INPUT VOLTAGE (DC CHARGING MODE)
0.8
2
MAX8804Y/Z toc04
0
0.6
0.4
0.2
0
0
0
5
10
15
20
INPUT VOLTAGE (V)
25
0
30
200
MAX8804Y/Z toc05
160
CHARGE CURRENT (mA)
500
400
300
200
4
6
8
10 12
INPUT VOLTAGE (V)
14
16
CHARGE CURRENT vs. BATTERY VOLTAGE
(USB CHARGING MODE)
CHARGE CURRENT vs. BATTERY VOLTAGE
(DC CHARGING MODE)
600
2
MAX8804Y/Z toc06
SUPPLY CURRENT (mA)
0.6
0.2
0
CHARGE CURRENT (mA)
MAX8804Y/Z toc02
0.8
SUPPLY CURRENT (mA)
0.8
SUPPLY CURRENT (mA)
1.0
MAX8804Y/Z toc01
1.0
SUPPLY CURRENT vs. INPUT VOLTAGE
(USB CHARGING MODE)
120
80
40
100
0
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATTERY VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATTERY VOLTAGE (V)
_______________________________________________________________________________________
5
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
Typical Operating Characteristics
(VBAT = 3.6V; DC charge mode: VDC = 5V, VUSB = 0V, VDETBAT = 0V (MAX8804Y/MAX8804Z only), VSET = 0V or unconnected; USB
charge mode: VUSB = 5V, VDC = 0V, VSET = 5V; TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VBAT = 3.6V; DC charge mode: VDC = 5V, VUSB = 0V, VDETBAT = 0V (MAX8804Y/MAX8804Z only), VSET = 0V or unconnected; USB
charge mode: VUSB = 5V, VDC = 0V, VSET = 5V; TA = +25°C, unless otherwise noted.)
CHARGE CURRENT
vs. DC INPUT VOLTAGE
CHARGE CURRENT
vs. USB INPUT VOLTAGE
CHARGE CURRENT (mA)
400
300
200
MAX8804Y/Z toc09
MAX8804Y/Z toc08
500
CHARGE CURRENT vs. SET PULSE
(USB CHARGING MODE) (MAX8804Y/MAX8804Z)
120
MAX8804Y/Z toc07
600
90
VSET
1V/div
60
475mA
380mA
95mA
95mA
0
10
15
20
INPUT VOLTAGE (V)
25
30
0
2
4
6
8
10 12
INPUT VOLTAGE (V)
14
MAX8804Y/Z toc10
600
INPUT VOLTAGE DECREASING
700mA
550mA
650mA
600mA
700mA
200mA/div
450mA
500mA
500mA
CHARGE CURRENT (mA)
500
1V/div
2ms/div
CHARGE CURRENT
vs. INPUT VOLTAGE HEADROOM
CHARGE CURRENT vs. SET PULSE
(DC CHARGING MODE) (MAX8804Y/MAX8804Z)
VSET
16
400mA
BATTERY REGULATION VOLTAGE
vs. AMBIENT TEMPERATURE
400
DC MODE
300
200
USB MODE
100
0
100
200
300
400
INPUT VOLTAGE HEADROOM (mV)
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
DC MODE
4.192
4.186
500
-40
-15
10
35
60
AMBIENT TEMPERATURE (°C)
500
400
300
MAX8804Y/Z toc14
4.30
BATTERY REGULATION VOLTAGE (V)
CHARGE CURRENT (mA)
600
4.198
BATTERY REGULATION VOLTAGE
vs. LOAD CURRENT
MAX8804Y/Z toc13
700
USB MODE
4.204
4.180
0
2ms/div
4.210
BATTERY REGULATION VOLTAGE (V)
5
MAX8804Y/Z toc11
0
4.25
4.20
4.15
DC CHARGE MODE 650mA
550mA CHARGE-CURRENT SETTING
4.10
200
-40
6
475mA
200mA/div
95mA
0
380mA
ICHG
30
100
ICHG
475mA
-15
10
35
60
AMBIENT TEMPERATURE (°C)
MAX8804Y/Z toc12
CHARGE CURRENT (mA)
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
85
0
100
200 300 400 500
LOAD CURRENT (mA)
600
_______________________________________________________________________________________
700
85
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
PIN
MAX8804V/
MAX8804W
MAX8804Y/
MAX8804Z
NAME
1
1
BAT
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.
2
—
DETBAT
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.
—
2
USBPWR
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.
3
3
POK
4
4
DC
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.
5
5
USB
USB Input Source. Connect USB to a USB port. Bypass USB to GND with a 1µF or
larger ceramic capacitor.
6
6
CHG
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.
7
7
SET
8
8
GND
—
—
EP
FUNCTION
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 VUVLO or VBAT.
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.
Ground
Exposed Paddle. Connect to the GND plane for optimum thermal dissipation.
_______________________________________________________________________________________
7
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
Pin Description
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
4.15V TO 30V
BAT
DC
Li+
4.15V TO 16V
USB
+105°C
DC AND USB OUTPUT CONTROL
TEMP
SENSOR
VOLTAGE
LOOP
MAX8804V
MAX8804W
MAX8804Y
MAX8804Z
OVERVOLTAGE
PROTECTION
(DETBAT)
DC
POK
SET
CHG
POK
LOGIC
CONTROL
<USBPWR>
USB
POK
REF
BIAS
CIRCUIT
GND
NOTE: ( ) FOR MAX8804V/MAX8804W ONLY
< > FOR MAX8804Y/MAX8804Z ONLY
Figure 1. Functional Diagram
Detailed Description
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z dualinput 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 MAX8804V/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 soft-starts as it enters the fast-charge stage.
The MAX8804Y eliminates the prequalification state and
enters fast-charge when the battery is inserted. The fastcharge current level is programmed by a simple single8
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 MAX8804V/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 single-wire interface (see Tables 2, 3,
and 4). The USB charge current is programmable to
95mA, 380mA, or 475mA through the same interface
(see Tables 5 and 6).
_______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
STANDBY MODE
CHARGER = OFF
POK = LOW
CHG = HIGH IMPEDANCE
MAX8804V/
MAX8804W/
MAX8804Z
VUVLO < VIN < VOVP
AND VIN > VBAT
tSET = LOW > 2ms
FOR DC MODE
tSET = HIGH > 2ms
FOR USB MODE
PREQUALIFICATION
DEFAULT CHARGE CURRENT
POK = LOW
CHG = LOW
VBAT < 2.5V
VBAT < 2.2V
MAX8804V/
MAX8804W/
MAX8804Z
SHUTDOWN
CHARGER = OFF
POK = HIGH IMPEDANCE*
CHG = HIGH IMPEDANCE
VIN < VUVLO
OR VIN > VOVP
OR VBAT > VIN
OR DETBAT = HIGH
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
ASYNCHRONOUS
FROM ANYWHERE
tSET = HIGH > 2ms
FOR DC MODE
tSET = LOW > 2ms
FOR USB MODE
ASYNCHRONOUS
FROM ANYWHERE
VIN < VUVLO
OR VIN > VOVP
OR VBAT > VIN
OR DETBAT = HIGH
MAX8804Y
tSET = LOW > 2ms
FOR DC MODE
tSET = HIGH > 2ms
FOR USB MODE
VBAT > 2.5V
FAST-CHARGE
100% CHARGE CURRENT
POK = LOW
CHG = LOW
ICHG > ITOP-OFF + 57mA FOR ALL
FAST-CHARGE OPTIONS EXCEPT 95mA
ICHG < ITOP-OFF
CV MODE TO CC MODE FOR 95mA
FAST-CHARGE OPTION
FULL BAT
VBAT = 4.2V
POK = LOW
CHG = HIGH IMPEDANCE
*POK = LOW WHEN VIN > VOVP
Figure 2. Charger State Diagram
DC Charging
USB Charging
The MAX8804V/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.
The MAX8804V/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.
_______________________________________________________________________________________
9
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
DC/USB Mode and
Charging Current Setting
Table 1. SET Truth Table
SET
VDC
VUSB
0
Invalid
Invalid
0
Invalid
Valid
CHARGER STATUS
Off
Off
0
Valid
Invalid
DC charging mode enabled,
USB charging mode disabled
0
Valid
Valid
DC charging mode enabled,
USB charging mode disabled
1
Invalid
Invalid
1
Invalid
Valid
1
Valid
Invalid
Off
DC charging mode disabled,
USB charging mode enabled
Off
1
Valid
Valid
Off
Note: This table is true when DETBAT = LOW for the
MAX8804V/MAX8804W. When DETBAT = HIGH, the MAX8804W
enters shutdown.
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. 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 MAX8804V/ MAX8804W/MAX8804Y/
MAX8804Z go into the default mode and start a new
cycle. See Tables 2, 3, and 4 and Figure 3 to set the
desired charging current and top-off threshold. Drive
SET high longer than 2ms to disable the DC chargingcontrol circuitry.
Table 2. MAX8804Y/MAX8804Z DC Charging Current Programming by Series Pulses
PULSE
NUMBER
DEFAULT
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
ICHG (mA)
500
500
500
500
550
550
550
550
600
600
600
600
450
450
450
Top-Off Current
Threshold (mA)
80
90
100
70
80
90
100
70
80
90
100
70
80
90
100
PULSE
NUMBER
—
15th
16th
17th
18th
19th
20th
21st
22nd
23rd
24th
25th
26th
27th
28th
ICHG (mA)
—
450
400
400
400
400
650
650
650
650
700
700
700
700
500
Top-Off Current
Threshold (mA)
—
70
80
90
100
70
80
90
100
70
80
90
100
70
80
Table 3. MAX8804W DC Charging Current Programming by Series Pulses
PULSE
NUMBER
DEFAULT
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
ICHG (mA)
450
450
450
450
550
550
550
550
500
500
500
500
400
400
400
Top-Off Current
Threshold (mA)
80
90
100
70
80
90
100
70
80
90
100
70
80
90
100
PULSE
NUMBER
—
15th
16th
17th
18th
19th
20th
21st
22nd
23rd
24th
25th
26th
27th
28th
ICHG (mA)
—
400
600
600
600
600
650
650
650
650
700
700
700
700
450
Top-Off Current
Threshold (mA)
—
70
80
90
100
70
80
90
100
70
80
90
100
70
80
10
______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
PULSE
NUMBER
DEFAULT
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
ICHG (mA)
450
450
450
450
550
550
550
550
500
500
500
500
400
400
400
Top-Off Current
Threshold (mA)
120
140
180
200
120
140
180
200
120
140
180
200
120
140
180
PULSE
NUMBER
—
15th
16th
17th
18th
19th
20th
21st
22nd
23rd
24th
25th
26th
27th
28th
ICHG (mA)
—
400
600
600
600
600
650
650
650
650
700
700
700
700
450
Top-Off Current
Threshold (mA)
—
200
120
140
180
200
120
140
180
200
120
140
180
200
120
DC
POK
1
2
3
4
24
25
26
27
28
> 2ms
SET
tHIGH
2ms tSOFTSTART
DELAY
550mA
(550mA)
500mA
(450mA)
ICHG
TOP-OFF
CURRENT
THRESHOLD
700mA
(700mA)
500mA
(450mA)
0mA
0mA
80mA
<120mA>
NOTE: ( ) FOR MAX8804V/MAX8804W
< >FOR MAX8804V
100mA
90mA <180mA>
<140mA>
80mA
70mA <120mA>
<200mA>
100mA
90mA
<180mA>
80mA <140mA>
70mA
<120mA>
<200mA>
80mA
<120mA>
Figure 3. DC Charging Current and Top-Off Threshold Programming
______________________________________________________________________________________
11
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
Table 4. MAX8804V DC Charging Current Programming by Series Pulses
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
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 for the MAX8804Y/
MAX8804Z and from 380mA, 475mA, to 95mA for the
MAX8804V/MAX8804W and then repeat new cycle as
shown in Tables 5 and 6. Drive SET low or leave it
unconnected longer than 2ms to disable USB charging-control circuitry.
Table 5. MAX8804Y/MAX8804Z USB
Charging Current Programming by Series
Pulses
DEFAULT
1st
2nd
3rd
ICHG (mA)
PULSE NUMBER
95
380
475
95
Top-Off Current
Threshold (mA)
80
80
80
80
Table 6. MAX8804V/MAX8804W USB
Charging Current Programming by Series
Pulses
DEFAULT
1st
2nd
3rd
ICHG (mA)
PULSE NUMBER
380
475
95
380
Top-Off Current
Threshold (mA)
80
80
80
80
USB
POK
USBPWR
1
2
3
> 2ms
SET
tLOW
2ms
t
DELAY SOFTSTART
MAX8804Y/
MAX8804Z
ICHG
475mA
380mA
95mA
0mA
95mA
0mA
475mA
380mA
380mA
MAX8804V/MAX8804W
ICHG
0mA
TOP-OFF
CURRENT
THRESHOLD
0mA
95mA
80mA
Figure 4. USB Charging Current Programming
12
______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
Thermal Regulation Control
The thermal-regulation loop limits the MAX8804V/
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
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z are in
prequalification or fast-charge mode. CHG goes high
impedance when the charge current reaches the topoff 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 MAX8804V/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.
Power-OK Monitor (POK)
The MAX8804V/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 MAX8804V/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 VUSB > VUVLO
and VUSB - VBAT > 250mV. Otherwise, it is high impedance. 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, MAX8804V/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 MAX8804V/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 MAX8804V/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 MAX8804V/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:
______________________________________________________________________________________
13
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
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 MAX8804V/MAX8804W/
MAX8804Z has a prequalification state and the charging current ramps up when the prequalification state is
complete (VBAT exceeds 2.5V).
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
Microprocessor-Interfaced Li+ Charger
Figure 5 shows the MAX8804V/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.
VIN(MIN) > 4.2V + ICHARGE(MAX) x RON
where R ON is 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
Layout and Bypassing
Stand-Alone Li+ Charger
The MAX8804V/MAX8804W/MAX8804Y/MAX8804Z provide a complete Li+ charging solution. The Typical
Application Circuit shows the MAX8804V/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.
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.
SYSTEM I/O
AC
ADAPTER
DC
1μF
USB PORT
MAX8804V
MAX8804W
MAX8804Y
MAX8804Z
CHG
POK
μP
USB
1μF
<USBPWR>
(DETBAT)
BAT
Li+
SET
2.2μF
GND
NOTE: ( ) FOR MAX8804V/MAX8804W
< > FOR MAX8804Y/MAX8804Z
Figure 5. Microprocessor-Interfaced Li+ Charger with the MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
14
______________________________________________________________________________________
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
Chip Information
PROCESS: BiCMOS
TOP VIEW
GND
SET
CHG
USB
8
7
6
5
Package Information
MAX8804V
MAX8804W
MAX8804Y
MAX8804Z
For the latest package outline information, go to
www.maxim-ic.com/packages.
+
1
2
3
BAT USBPWR POK
(DETBAT)
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
8 TDFN-EP
T823+1
21-0174
4
DC
TDFN
2mm × 3mm
( ) FOR MAX8804V/MAX8804W
______________________________________________________________________________________
15
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
Pin Configuration
MAX8804V/MAX8804W/MAX8804Y/MAX8804Z
High-Voltage, Dual-Input, USB/AC
Adapter Chargers in 2mm x 3mm TDFN
Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0
4/07
Initial release.
1
10/07
Added MAX8804W and Battery Pack Detection feature.
1–16
—
2
4/08
Added MAX8804V and updated DC Charge Mode section.
1–15
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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2008 Maxim Integrated Products
Heaney
is a registered trademark of Maxim Integrated Products, Inc.