Maxim MAX1508 Linear li battery charger with integrated pass fet, thermal regulation, and acokin 3mm x 3mm tdfn Datasheet

19-2890; Rev 1; 10/03
KIT
ATION
EVALU
LE
B
A
IL
A
AV
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
TEMP RANGE
PIN-PACKAGE
TOP
MARK
MAX1508ETA
-40°C to +85°C
8 Thin DFN-EP*
AHF
MAX1508YETA
-40°C to +85°C
8 Thin DFN-EP*
AIL
MAX1508ZETA
-40°C to +85°C
8 Thin DFN-EP*
AIK
PART
*EP = Exposed paddle.
Pin Configuration
TOP VIEW
EN (EN)
Cellular and Cordless Phones
PDAs
Digital Cameras and MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth™ Equipment
Ordering Information
ACOK
Applications
♦ Active-High Charge Enable (EN) (MAX1508Y)
BATT
The MAX1508 achieves high flexibility by providing an
adjustable fast-charge current by an external resistor.
Other features include the charging status (CHG) of the
battery, an active-low control input (EN) for the
MAX1508 and MAX1508Z (active-high control input for
the MAX1508Y), and an active-low input power-source
detection output (ACOK).
The MAX1508 accepts a +4.25V to +13V supply, but disables charging when the input voltage exceeds +7V to
protect against unqualified or faulty AC adapters. The
MAX1508 operates over the extended temperature
range (-40°C to +85°C) and is available in a compact
8-pin thermally enhanced 3mm x 3mm thin DFN package with 0.8mm height.
♦ Input Power-Source Detection Output (ACOK)
♦ Soft-Start Limits Inrush Current
♦ No Prequalification State for the MAX1508Y and
MAX1508Z
♦ Charge Status Output (CHG) for LED or
Microprocessor Interface
♦ Small 3mm x 3mm 8-Pin Thin DFN Package,
0.8mm High
♦ Active-Low Charge Enable (EN) (MAX1508 and
MAX1508Z)
CHG
Proprietary thermal-regulation circuitry limits the die
temperature to +100°C when fast charging or while
exposed to high ambient temperatures, allowing maximum charging current without damaging the IC.
Features
♦ Stand-Alone Linear 1-Cell Li+ Battery Charger
♦ No External FET, Reverse-Blocking Diode, or
Current-Sense Resistor Required
♦ Programmable Fast-Charge Current (0.8A max)
♦ Proprietary Die-Temperature Regulation Control
(+100°C)
♦ +4.25V to +13V Input Voltage Range with Input
Overvoltage Protection (OVP) Above +7V
♦ Charge-Current Monitor for Fuel Gauging
♦ Low Dropout Voltage—130mV at 0.425A
8
7
6
5
MAX1508
MAX1508Y
MAX1508Z
1
2
3
4
VL
IN
GND
ISET
Typical Operating Circuit appears at end of data sheet.
3mm x 3mm THIN DFN
( ) ARE FOR THE MAX1508Y ONLY
Bluetooth is a trademark of Ericsson.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX1508/MAX1508Y/MAX1508Z
General Description
The MAX1508 is an intelligent, stand-alone constant-current, constant-voltage (CCCV), thermally regulated linear
charger for a single-cell lithium-ion (Li+) battery. The
MAX1508 integrates the current-sense circuit, MOS pass
element, and thermal-regulation circuitry, and also eliminates the reverse-blocking Schottky diode, to create the
simplest and smallest charging solution for hand-held
equipment.
The MAX1508 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 MAX1508Y and MAX1508Z eliminate the prequalification state to allow startup into a load
without a battery.
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
ABSOLUTE MAXIMUM RATINGS
IN, CHG to GND .....................................................-0.3V to +14V
VL, BATT, ISET, EN, EN, ACOK to GND ..................-0.3V to +6V
VL to IN...................................................................-14V to +0.3V
IN to BATT Continuous Current.............................................0.9A
Continuous Power Dissipation (TA = +70°C)
8-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW
Short-Circuit Duration.................................................Continuous
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
(VIN = 5V, VBATT = 4.0V, ACOK = EN = CHG = unconnected (for the MAX1508 and MAX1508Z), EN = VL (for the MAX1508Y), RISET
= 2.8kΩ to GND, CVL = 0.47µF, BATT bypassed to GND with 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
Input Voltage Range
Overvoltage Lockout Trip Point
4.25
6.50
V
60
VIN - VBATT, VIN falling
15
30
45
VIN rising
6.5
7
7.5
VIN hysteresis
0.11
Disabled, EN = VL (MAX1508/MAX1508Z),
EN = GND (MAX1508Y)
1
2
0.8
1.5
IVL = 100µA
3.3
IVL = 100µA to 2mA
-71
VL Temperature Coefficient
IVL = 100µA
-2
VIN rising
2.95
Hysteresis
0.17
EN = VL (MAX1508/MAX1508Z), EN = GND
(MAX1508Y)
4
10
Maximum RMS Charge Current
0.8
VBATT rising
µA
A
TA = 0°C to +85°C
4.162
4.2
4.238
TA = -40°C to +85°C
4.150
4.2
4.250
4.4
4.67
4.9
_______________________________________________________________________________________
mV
V
10
BATT Removal Detection Threshold
mA
mV/°C
3
IBATT = 0
V
V
-200
VIN = 0 to 4V
Battery Regulation Voltage
mV
0.065
VL Load Regulation
2
V
40
VL Output Voltage
BATT Input Current
UNITS
13
20
OFF state (VIN = VBATT = 4.0V)
VL Undervoltage Lockout Trip Point
MAX
VIN - VBATT, VIN rising
Charging (IIN - IBATT)
IN Input Current
TYP
0
Input Operating Range
ACOK Trip Point, IN
MIN
V
V
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
(VIN = 5V, VBATT = 4.0V, ACOK = EN = CHG = unconnected (for the MAX1508 and MAX1508Z), EN = VL (for the MAX1508Y,) RISET
= 2.8kΩ to GND, CVL = 0.47µF, BATT bypassed to GND with 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN
BATT Removal Detection-Threshold Hysteresis
Minimum BATT Bypass Capacitance
Fast-Charge Current-Loop System Accuracy
VBATT = 3.5V
Precharge Current System Accuracy
Percentage of the fast-charge current,
VBATT = 2.2V (MAX1508 only)
TYP
MAX
UNITS
200
mV
1
µF/A
478
520
562
mA
5
10
15
%
Die-Temperature-Regulation Set Point
°C
100
VBATT Precharge Threshold Voltage
VBATT rising (MAX1508 only)
2.3
2.5
2.7
V
Current-Sense Amplifier Gain, ISET to IBATT in
Fast-Charge Mode
IBATT = 500mA, VISET = 1.4V
0.880
0.958
1.035
mA/A
200
mV
Regulator Dropout Voltage (VIN - VBATT )
VBATT = 4.1V, IBATT = 425mA
EN or EN Logic Input Low Voltage
4.25V < VIN < 6.5V
EN or EN Logic Input High Voltage
4.25V < VIN < 6.5V
1.3
EN or EN Internal Pulldown Resistor
(MAX1508 and MAX1508Z only)
100
200
400
kΩ
CHG Output Low Current
V CHG = 1V
5
12
20
mA
CHG Output High Leakage Current
V CHG = 13V
ACOK Output Low Voltage
IACOK = 0.5mA
ACOK Output High Leakage Current
V ACOK = 5.5V
Full-Battery Detection Current Threshold
(as a Percentage of the Fast-Charge Current)
IBATT falling
130
0.52
TA = +25°C
1
TA = +85°C
0.002
0.4
TA = +25°C
1
TA = +85°C
0.002
5
V
V
10
15
µA
V
µA
%
Note 1: Limits are 100% production tested at TA = +25°C. Limits over operating temperature range are guaranteed through correlation using statistical quality control (SQC) methods.
_______________________________________________________________________________________
3
MAX1508/MAX1508Y/MAX1508Z
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VIN = 5V, VBATT = 4.0V, ACOK = EN = CHG = unconnected, EN = VL (MAX1508Y), RISET = 2.8kΩ to GND, CIN = 1µF, CBATT =
1µF, CVL = 0.47µF, TA = +25°C, unless otherwise noted.)
1.0
0.5
EN = VL (MAX1508/1508Z)
EN = GND (MAX1508Y)
1.5
1.0
0.5
4
6
8
10
12
0
2
4
6
8
0
1
2
3
4
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
BATTERY VOLTAGE (V)
CHARGE CURRENT
vs. INPUT VOLTAGE
CHARGE CURRENT
vs. INPUT-VOLTAGE HEADROOM
BATTERY REGULATION VOLTAGE
vs. TEMPERATURE
INPUT VOLTAGE (V)
VIN - VBATT (V)
500
480
4.186
-40
-15
10
35
60
MAX1508 toc09
600
500
VBATT = 3.6V
400
300
200
100
420
0
85
VBATT = 4.0V
700
440
60
4.189
800
460
35
4.192
900
CHARGE CURRENT (mA)
520
10
4.195
1000
MAX1508 toc07
540
AMBIENT TEMPERATURE (°C)
4.198
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
560
-15
4.201
TEMPERATURE (°C)
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
-40
4.204
4.180
0 0.04 0.08 0.12 0.16 0.20 0.24 0.28 0.32 0.36 0.40
580
4.207
4.183
0 1 2 3 4 5 6 7 8 9 10 11 12 13
600
4.210
MAX1508 toc06
600
550
500
450
400
350
300
250
200
150
100
50
0
BATTERY REGULATION VOLTAGE (V)
CHARGE CURRENT (mA)
MAX1508 toc04
600
550
500
450
400
350
300
250
200
150
100
50
0
CHARGE CURRENT (mA)
200
12
10
MAX1508 toc05
2
300
0
0
0
400
100
0
4
500
CHARGE CURRENT (mA)
1.5
600
MAX1508 toc02
2.0
DISABLED-MODE SUPPLY CURRENT (mA)
IBATT = 0
MAX1508 toc01
2.0
SUPPLY CURRENT (mA)
CHARGE CURRENT
vs. BATTERY VOLTAGE
DISABLED-MODE SUPPLY
CURRENT vs. INPUT VOLTAGE
MAX1508 toc03
SUPPLY CURRENT
vs. INPUT VOLTAGE
CHARGE CURRENT (mA)
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
RISET = 1.87kΩ
-40
-15
10
35
60
AMBIENT TEMPERATURE (°C)
_______________________________________________________________________________________
85
85
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
PIN
NAME
1
VL
Internally Generated Logic Supply for Chip. Bypass VL to GND with a 0.47µF capacitor.
2
IN
Input Supply Voltage. Bypass IN to GND with a 1µF capacitor to improve line noise and transient rejection.
3
GND
Ground. Connect GND and exposed pad to a large copper trace for maximum power dissipation.
4
ISET
Charge-Current Program and Fast-Charge Current Monitor. Output current from ISET is 0.958mA per amp of
battery charging current. The charging current is set by connecting a resistor from ISET to GND. Fast-charge
current = 1461V / RISETΩ.
EN
Logic-Level Enable Input (MAX1508/1508Z). Drive EN high to disable charger. Pull EN low or float for normal
operation. EN has an internal 200kΩ pulldown resistor.
EN
Logic-Level Enable Input (MAX1508Y). Drive EN low to disable charger. Drive EN high for normal operation.
6
ACOK
Input Power-Detection Output. The open-drain ACOK output asserts low when +4.25V < VIN < +7V and VIN VBATT > 40mV. ACOK requires an external 100kΩ pullup resistor. ACOK is high impedance in shutdown.
7
BATT
Li+ Battery Connection. Bypass BATT to GND with a capacitor of at least 1µF per ampere of charge current.
8
CHG
Charging Indicator, Open-Drain Output. CHG goes low (and can turn on an LED) when charging begins.
CHG is high impedance when the battery current drops below 10% of the fast-charging current, or when EN
is high. Connect a pullup resistor to the µP’s I/O voltage when interfacing with a µP logic input.
—
PAD
Exposed Pad. Connect exposed pad to a large copper trace for maximum power dissipation. The pad is
internally connected to GND.
5
FUNCTION
Detailed Description
The MAX1508 charger uses voltage, current, and thermal-control loops to charge a single Li+ cell and to protect the battery (Figure 1). When a Li+ battery with a cell
voltage below 2.5V is inserted, the MAX1508 charger
enters the prequalification stage where it precharges that
cell with 10% of the user-programmed fast-charge current. There is no prequalification stage for the MAX1508Z
and MAX1508Y in order to allow startup into a load without a battery. The CHG indicator output is driven low
(Figure 2) to indicate entry into the prequalification state.
Once the cell has passed 2.5V, the charger soft-starts
before it enters the fast-charge stage. The fast-charge
current level is programmed through a resistor from ISET
to ground. As the battery voltage approaches 4.2V, the
charging current is reduced. If the battery current drops
to less than 10% of the fast-charging current, the CHG
indicator goes high impedance, signaling the battery is
fully charged. At this point the MAX1508 enters a constant voltage-regulation mode to maintain the battery at
full charge. If, at any point while charging the battery, the
die temperature approaches +100°C, the MAX1508
reduces the charging current so the die temperature
does not exceed the temperature-regulation set point.
The thermal-regulation loop limits the MAX1508 die
temperature to +100°C by reducing the charge current
as necessary (see the Thermal Regulation section).
This feature not only protects the MAX1508 from overheating, but also allows higher charge current without
risking damage to the system.
MAX1508/MAX1508Z EN Charger
Enable Input
EN is a logic input (active low) to enable the charger.
Drive EN low, leave floating, or connect to GND to
enable the charger control circuitry. Drive EN high to
disable the charger control circuitry. EN has a 200kΩ
internal pulldown resistance.
MAX1508Y EN Charger Enable Input
EN is a logic input (active high) to enable the charger.
Drive EN high to enable the charger control circuitry.
Drive EN low to disable the charger control circuitry.
ACOK Output
Active-Low Output. The open-drain ACOK output
asserts low when +4.25V < VIN < +7V and VIN - VBATT
> 40mV. ACOK requires an external 100kΩ pullup
resistor to the system’s logic I/O voltage. ACOK is high
impedance in shutdown.
VL Internal Voltage Regulator
The MAX1508 linear charger contains an internal linear
regulator available on the VL output pin. VL requires a
0.47µF ceramic bypass capacitor to GND. VL is regulated to 3.3V whenever the input voltage is above 3.5V.
_______________________________________________________________________________________
5
MAX1508/MAX1508Y/MAX1508Z
Pin Description
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
CHG Charge Indicator Output
Soft-Start
CHG is an open-drain current source for indicating
charge status. Table 1 describes the state of CHG during different stages of operation.
An analog soft-start algorithm activates when entering
fast-charge mode. When the prequalification state is
complete (VBATT exceeds +2.5V), the charging current
ramps up in 3ms to the full charging current. This
reduces the inrush current on the input supply. Since
the MAX1508Y and MAX1508Z do not have a prequalification state, they automatically enter soft-start upon
activation.
CHG is a nominal 12mA current source suitable for driving a charge-indication LED. If the MAX1508 is used
in conjunction with a microprocessor, a pullup resistor
to the logic I/O voltage allows CHG to indicate charge
status to the µP instead of driving an LED.
MAX1508
BATT
IN
OUTPUT DRIVER,
CURRENT SENSE,
AND LOGIC
VREF
ISET
TEMPERATURE
SENSOR
IREF
100°C
IN
IN
VI/O
VL
VL
0.47µF
BATT
ACOK
VLUVLO
REF
IN
VINOVLO
VLOK
N
ON
INOK
LOGIC
REFOK
CHG
REFOK
EN (EN)
N
200kΩ
MAX1508 AND
MAX1508Z ONLY
GND
( ) ARE FOR MAX1508Y ONLY
Figure 1. Functional Diagram
6
_______________________________________________________________________________________
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
MAX1508/MAX1508Y/MAX1508Z
ASYNCHRONOUS FROM
ANYWHERE
VIN > 7V +
VBATT > VIN +
EN = HIGH
SHUTDOWN
VBATT < 2.5V
D
AN D
7V T AN
<
T
V IN > V BA
V IN = LOW
EN
PRECHARGE
10% CHARGE CURRENT
LED = ON
(MAX1508 ONLY)
CHARGER = OFF
LED = OFF
VIN > 7V +
VBATT > VIN +
EN = HIGH
VBATT < 2.4V
VBATT > 2.5V
FAST CHARGE
100% CHARGER CURRENT
LED = ON
ICHARGE < 10%
OF ISET
ICHARGE > 20%
OF ISET
FULL BATT
LED = OFF
FULL BATT CONTINUES
TO REGULATE BATT
UP TO 4.2V
Figure 2. Charge State Diagram
Applications Information
Charge-Current Selection
The maximum charging current is programmed by an
external RISET resistor connected from ISET to GND.
Select the RISET value based on the following formula:
IFAST = 1461V / RISETΩ
where IFAST is in amps and RISET is in ohms. ISET can
also be used to monitor the fast-charge current level.
The output current from the ISET pin is 0.958mA per
amp of charging current. The output voltage at ISET is
proportional to the charging current as follows:
VISET = (ICHG x RISET) / 1044
The voltage at ISET is nominally 1.4V at the selected
fast-charge current, and falls with charging current as
the cell becomes fully charged.
Thermal Regulation
The MAX1508 features a proprietary thermal-regulation
circuit to protect both the IC and the system from
excessive heat. When the MAX1508’s die temperature
reaches +100°C, the charge current is reduced to prevent any additional increase in the die temperature. An
active thermal loop does not indicate a fault condition.
Thermal regulation allows the MAX1508 to provide continuous charge to the battery under adverse conditions
without causing excessive power dissipation.
_______________________________________________________________________________________
7
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
Capacitor Selection
Connect a ceramic capacitor from BATT to GND for
proper stability. Use a 1µF X5R ceramic capacitor for
most applications.
Connect a 1µF ceramic capacitor from IN to GND. Use
a larger input bypass capacitor for high input voltages
or high charging currents to reduce supply noise.
Connect a 0.47µF ceramic capacitor from VL to GND.
Thermal Considerations
The MAX1508 is in a thermally enhanced thin DFN package with exposed paddle. Connect the exposed paddle
of the MAX1508 to a large copper ground plane to provide a thermal contact between the device and the circuit
board. The exposed paddle transfers heat away from the
device, allowing the MAX1508 to charge the battery with
maximum current, while minimizing the increase in die
temperature.
DC Input Sources
The MAX1508 operates from well-regulated DC
sources. The full-charging input voltage range is 4.25V
to 7V. The device can stand up to 13V on the input
without damage to the IC. If VIN is greater than 7V, then
the MAX1508 stops charging.
An appropriate power supply must provide at least
4.25V when sourcing the desired peak charging current. It also must stay below 6.5V when unloaded.
Application Circuits
Stand-Alone Li+ Charger
The MAX1508 provides a complete Li+ charging solution. The Typical Operating Circuit at the end of the
data sheet shows the MAX1508 as a stand-alone Li+
battery charger. The 2.8kΩ resistor connected to ISET
sets a charging current of 520mA. The LED indicates
when either fast-charge or precharge qualification has
begun. When the battery is full, the LED turns off.
Microprocessor-Interfaced Charger
Figure 3 shows the MAX1508 as a µP-cooperated Li+
battery charger. The MAX1508 and MAX1508Z start
charging the battery when EN is low. The µP can drive
EN high to disable the charger (MAX1508 and
MAX1508Z). The MAX1508’s ACOK output indicates
the presence of a valid AC adapter to the µP. CHG can
be used to detect the charge status of a battery. By
monitoring VISET, the system can measure the charge
current.
USB-Powered Li+ Charger
The universal serial bus (USB) provides a high-speed
serial communication port as well as power for the
remote device. The MAX1508 can be configured to
charge its battery at the highest current possible from
the host port. Figure 4 shows the MAX1508 as a USB
battery charger. To make the circuit compatible with
either 100mA or 500mA USB ports, the circuit initializes
at 95mA charging current. The microprocessor then
interrogates the host to determine its current capability.
If the host port is capable, the charging current is
increased to 435mA. The 435mA current was chosen to
avoid exceeding the 500mA USB specification.
Layout and Bypassing
Connect a 1µF ceramic input capacitor as close to the
device as possible. Provide a large copper GND plane
to allow the exposed paddle to sink heat away from the
device. Connect the battery to BATT as close to the
device as possible to provide accurate battery voltage
sensing. Make all high-current traces short and wide to
minimize voltage drops. For an example layout, refer to
the MAX1507/MAX1508 evaluation kit layout.
Chip Information
TRANSISTOR COUNT: 1812
PROCESS: BiCMOS
Table 1. CHG States
EN
(MAX1508/MAX1508Z)
EN
(MAX1508Y)
VIN
VBATT
CHG
STATE
X
X
VBATT
VIN
0
Hi-Z
Shutdown
Low
High
4.25V ≤ VIN ≤ 7V
< 2.5V
10% of IFAST
Low
Prequalification
Low
High
IFAST*
Low
Fast Charge
High
4.25V ≤ VIN ≤ 7V
4.25V ≤ VIN ≤ 7V
≥ 2.5V
Low
4.2V
10% of IFAST
Hi-Z
Full Charge
Low
High
>7V
X
0
Hi-Z
Overvoltage
0
Hi-Z
Disabled
High
Low
X
X
X = Don’t care.
*IFAST is reduced as necessary to maintain the die temperature at +100°C.
8
IBATT
_______________________________________________________________________________________
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
MAX1508/MAX1508Y/MAX1508Z
4.2V Li+
IN
AC/DC
ADAPTER
BATT
1µF
1µF
MAX1508
CHG MAX1508Y GND
MAX1508Z
VI/O
SYSTEM
VL
ACOK
ISET
EN (EN)
0.47µF
2.8kΩ
CHARGE-CURRENT MONITOR
VI/O
LOW: CHARGE, HIGH: FULL OR OFF
( ) ARE FOR THE MAX1508Y ONLY
Figure 3. µP-Interfaced Li+ Battery Charger
4.2V Li+
VBUS
IN
BATT
1µF
1µF
GND
CHG
MAX1508
MAX1508Y
MAX1508Z
VL
VI/O
GND
SYSTEM
ACOK
0.47µF
USB PORT
EN (EN)
ISET
15.4kΩ
HIGH: 435mA, LOW: 95mA
4.3kΩ
N
VI/O
D+
D( ) ARE FOR THE MAX1508Y ONLY
Figure 4. USB Battery Charger
_______________________________________________________________________________________
9
Typical Operating Circuit
INPUT
4.25V TO 13V
IN
BATT
Li+
4.2V
1µF
1µF
MAX1508
MAX1508Y
MAX1508Z
CHG
ISET
OFF
ACOK
EN (EN)
ON
VL
2.80kΩ
GND
0.47µF
( ) ARE FOR THE MAX1508Y ONLY
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.)
6, 8, &10L, QFN THIN.EPS
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
L
A
D
D2
A2
PIN 1 ID
1
N
1
C0.35
b
E
PIN 1
INDEX
AREA
[(N/2)-1] x e
REF.
E2
DETAIL A
e
k
A1
CL
CL
L
L
e
e
A
DALLAS
SEMICONDUCTOR
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 6, 8 & 10L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
APPROVAL
DOCUMENT CONTROL NO.
21-0137
10
______________________________________________________________________________________
REV.
D
1
2
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
COMMON DIMENSIONS
SYMBOL
A
MIN.
MAX.
0.70
0.80
D
2.90
3.10
E
2.90
3.10
A1
0.00
0.05
L
k
0.20
0.40
0.25 MIN.
A2
0.20 REF.
PACKAGE VARIATIONS
PKG. CODE
N
D2
E2
e
JEDEC SPEC
b
T633-1
6
1.50–0.10
2.30–0.10
0.95 BSC
MO229 / WEEA
0.40–0.05
1.90 REF
T833-1
8
1.50–0.10
2.30–0.10
0.65 BSC
MO229 / WEEC
0.30–0.05
1.95 REF
T1033-1
10
1.50–0.10
2.30–0.10
0.50 BSC
MO229 / WEED-3
0.25–0.05
2.00 REF
[(N/2)-1] x e
DALLAS
SEMICONDUCTOR
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 6, 8 & 10L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
APPROVAL
DOCUMENT CONTROL NO.
21-0137
REV.
D
2
2
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 ____________________ 11
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX1508/MAX1508Y/MAX1508Z
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.)
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