General Description
The MAX1508 is an intelligent, stand-alone constant-cur-
rent, 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 elimi-
nates 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 con-
trol the charging sequence from the prequalification state
through fast-charge, top-off charge, and full-charge indi-
cation. The MAX1508Y and MAX1508Z eliminate the pre-
qualification state to allow startup into a load without a
battery.
Proprietary thermal-regulation circuitry limits the die
temperature to +100°C when fast charging or while
exposed to high ambient temperatures, allowing maxi-
mum charging current without damaging the IC.
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 dis-
ables 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 pack-
age with 0.8mm height. Applications
Cellular and Cordless Phones
PDAs
Digital Cameras and MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth™ Equipment
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
♦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)
♦Active-High Charge Enable (EN) (MAX1508Y)
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
________________________________________________________________ Maxim Integrated Products 1
ACOK
EN (EN)
ISET
12
CHG
BATT
IN
GND
VL
3mm x 3mm THIN DFN
TOP VIEW
34
MAX1508
MAX1508Y
MAX1508Z
876
5
( ) ARE FOR THE MAX1508Y ONLY
+
Pin Configuration
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
TOP
MARK
MAX1508ETA-T
-40°C to +85°C8 Thin DFN-EP*
AHF
MAX1508ETA+T
-40°C to +85°C8 Thin DFN-EP*
AHF
19-2890; Rev 2; 8/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
Bluetooth is a trademark of Ericsson.
*EP = Exposed paddle.
+Denotes lead-free package.
Ordering Information continued at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
2_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN = 5V, VBATT = 4.0V, ACOK = EN = CHG = unconnected (for the MAX1508 and MAX1508Z), EN = VL (for the MAX1508Y), RISET
= 2.8kΩto 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)
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.
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
PARAMETER CONDITIONS
TYP
MAX
UNITS
Input Voltage Range 013V
Input Operating Range
4.25 6.50
V
VIN - VBATT, VIN rising 20 40 60
ACOK Trip Point, IN VIN - VBATT, VIN falling 15 30 45 mV
VIN rising 6.5 7 7.5
Overvoltage Lockout Trip Point VIN hysteresis
0.11
V
Charging (IIN - IBATT)12
Disabled, EN = VL (MAX1508/MAX1508Z),
EN = GND (MAX1508Y) 0.8 1.5
IN Input Current
OFF state (VIN = VBATT = 4.0V)
0.065
mA
VL Output Voltage IVL = 100µA 3.3 V
VL Load Regulation IVL = 100µA to 2mA -71
-200
mV
VL Temperature Coefficient IVL = 100µA -2
mV/°C
VIN rising
2.95
VL Undervoltage Lockout Trip Point Hysteresis
0.17
V
VIN = 0 to 4V 3 10
BATT Input Current EN = VL (MAX1508/MAX1508Z), EN = GND
(MAX1508Y) 410
µA
Maximum RMS Charge Current 0.8 A
TA = 0°C to +85°C
4.162
4.2
4.238
Battery Regulation Voltage IBATT = 0 TA = -40°C to +85°C
4.150
4.2
4.250
V
BATT Removal Detection Threshold VBATT rising 4.4
4.67
4.9 V
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
_______________________________________________________________________________________ 3
Note 1: Limits are 100% production tested at TA= +25°C. Limits over operating temperature range are guaranteed through correla-
tion using statistical quality control (SQC) methods.
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 5V, VBATT = 4.0V, ACOK = EN = CHG = unconnected (for the MAX1508 and MAX1508Z), EN = VL (for the MAX1508Y,) RISET
= 2.8kΩto 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
TYP
MAX
UNITS
BATT Removal Detection-Threshold Hysteresis 200
mV
Minimum BATT Bypass Capacitance 1
µF/A
Fast-Charge Current-Loop System Accuracy VBATT = 3.5V
478 520
562 mA
Precharge Current System Accuracy Percentage of the fast-charge current,
VBATT = 2.2V (MAX1508 only) 51015%
Die-Temperature-Regulation Set Point
100
°C
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
Regulator Dropout Voltage (VIN - VBATT )V
BATT = 4.1V, IBATT = 425mA
130
200 mV
EN or EN Logic Input Low Voltage 4.25V < VIN < 6.5V
0.52
V
EN or EN Logic Input High Voltage 4.25V < VIN < 6.5V 1.3 V
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
TA = +25°C 1
CHG Output High Leakage Current V CHG = 13V TA = +85°C
0.002
µA
ACOK Output Low Voltage IACOK = 0.5mA 0.4 V
TA = +25°C 1
ACOK Output High Leakage Current V ACOK = 5.5V TA = +85°C
0.002
µA
Full-Battery Detection Current Threshold
(as a Percentage of the Fast-Charge Current) IBATT falling 5 10 15 %
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
4_______________________________________________________________________________________
Typical Operating Characteristics
(VIN = 5V, VBATT = 4.0V, ACOK = EN = CHG = unconnected, EN = VL (MAX1508Y), RISET = 2.8kΩto GND, CIN = 1µF, CBATT =
1µF, CVL = 0.47µF, TA= +25°C, unless otherwise noted.)
0
0.5
1.0
1.5
2.0
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1508 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
068
2410
12
IBATT = 0
0
0.5
1.0
1.5
2.0
DISABLED-MODE SUPPLY
CURRENT vs. INPUT VOLTAGE
MAX1508 toc02
INPUT VOLTAGE (V)
DISABLED-MODE SUPPLY CURRENT (mA)
068
4210
12
EN = VL (MAX1508/1508Z)
EN = GND (MAX1508Y)
0
200
100
400
300
500
600
01234
CHARGE CURRENT
vs. BATTERY VOLTAGE
MAX1508 toc03
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)
0
50
250
150
450
350
550
200
100
400
300
500
600
06824 101217935 1113
CHARGE CURRENT
vs. INPUT VOLTAGE
MAX1508 toc04
INPUT VOLTAGE (V)
CHARGE CURRENT (mA)
0
200
100
400
300
500
50
250
150
450
350
550
600
00.160.08 0.24 0.400.04 0.200.12 0.28 0.32 0.36
CHARGE CURRENT
vs. INPUT-VOLTAGE HEADROOM
MAX1508 toc05
VIN - VBATT (V)
CHARGE CURRENT (mA)
4.180
4.186
4.198
4.192
4.204
4.189
4.183
4.201
4.195
4.207
4.210
-40 10-15 35 60 85
BATTERY REGULATION VOLTAGE
vs. TEMPERATURE
MAX1508 toc06
TEMPERATURE (°C)
BATTERY REGULATION VOLTAGE (V)
600
560
520
460
420
580
540
480
500
440
-40 10-15 35 60 85
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
MAX1508 toc07
AMBIENT TEMPERATURE (°C)
CHARGE CURRENT (mA)
0
200
600
400
800
100
300
700
500
900
1000
-40 10-15 35 60 85
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
MAX1508 toc09
AMBIENT TEMPERATURE (°C)
CHARGE CURRENT (mA)
VBATT = 4.0V
VBATT = 3.6V
RISET = 1.87kΩ
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
_______________________________________________________________________________________ 5
Detailed Description
The MAX1508 charger uses voltage, current, and ther-
mal-control loops to charge a single Li+ cell and to pro-
tect 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 cur-
rent. There is no prequalification stage for the MAX1508Z
and MAX1508Y in order to allow startup into a load with-
out 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 con-
stant 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 over-
heating, 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 100kΩpullup
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 regulat-
ed to 3.3V whenever the input voltage is above 3.5V.
PIN
NAME
FUNCTION
1VLInternally Generated Logic Supply for Chip. Bypass VL to GND with a 0.47µF capacitor.
2INInput Supply Voltage. Bypass IN to GND with a 1µF capacitor to improve line noise and transient rejection.
3GND Ground. Connect GND and exposed pad to a large copper trace for maximum power dissipation.
4ISET
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.
5
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.
7BATT Li+ Battery Connection. Bypass BATT to GND with a capacitor of at least 1µF per ampere of charge current.
8CHG
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.
Pin Description
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
6_______________________________________________________________________________________
MAX1508
OUTPUT DRIVER,
CURRENT SENSE,
AND LOGIC
VLUVLO
VINOVLO
IN
ON
INOK
REFOK
VLOK
REFOK
REF
VL
N
LOGIC
TEMPERATURE
SENSOR
VREF
IREF
IN
ISET
VL
0.47µF
BATT
EN (EN)
200kΩ
GND
IN
100°C
BATT
CHG
IN
N
ACOK
VI/O
MAX1508 AND
MAX1508Z ONLY
( ) ARE FOR MAX1508Y ONLY
CHG
Charge Indicator Output
CHG is an open-drain current source for indicating
charge status. Table 1 describes the state of CHG dur-
ing different stages of operation.
CHG is a nominal 12mA current source suitable for dri-
ving 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.
Soft-Start
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 prequali-
fication state, they automatically enter soft-start upon
activation.
Figure 1. Functional Diagram
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
_______________________________________________________________________________________ 7
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 pre-
vent any additional increase in the die temperature. An
active thermal loop does not indicate a fault condition.
Thermal regulation allows the MAX1508 to provide con-
tinuous charge to the battery under adverse conditions
without causing excessive power dissipation.
SHUTDOWN
CHARGER = OFF
LED = OFF
PRECHARGE
10% CHARGE CURRENT
LED = ON
(MAX1508 ONLY)
FAST CHARGE
100% CHARGER CURRENT
LED = ON
FULL BATT CONTINUES
TO REGULATE BATT
UP TO 4.2V
ICHARGE < 10%
OF ISET
VBATT > 2.5V
VBATT < 2.4V
VBATT < 2.5V
VIN < 7V AND
VIN > VBATT AND
EN = LOW
VIN > 7V +
VBATT > VIN +
EN = HIGH
ASYNCHRONOUS FROM
ANYWHERE
VIN > 7V +
VBATT > VIN +
EN = HIGH
ICHARGE > 20%
OF ISET
FULL BATT
LED = OFF
Figure 2. Charge State Diagram
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
8_______________________________________________________________________________________
EN
(MAX1508/MAX1508Z)
EN
(MAX1508Y)
VIN VBATT IBATT CHG STATE
XXV
BATT VIN 0Hi-Z Shutdown
Low High
4.25V ≤ VIN ≤ 7V
< 2.5V
10% of IFAST
Low Prequalification
Low High
4.25V ≤ VIN ≤ 7V
≥ 2.5V IFAST*Low Fast Charge
Low High
4.25V ≤ VIN ≤ 7V
4.2V
10% of IFAST
Hi-Z Full Charge
Low High >7V X 0 Hi-Z Overvoltage
High Low X X 0 Hi-Z Disabled
X = Don’t care.
*IFAST is reduced as necessary to maintain the die temperature at +100°C.
Table 1. CHG States
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 pack-
age with exposed paddle. Connect the exposed paddle
of the MAX1508 to a large copper ground plane to pro-
vide 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 cur-
rent. It also must stay below 6.5V when unloaded.
Application Circuits
Stand-Alone Li+ Charger
The MAX1508 provides a complete Li+ charging solu-
tion. The Typical Operating Circuit at the end of the
data sheet shows the MAX1508 as a stand-alone Li+
battery charger. The 2.8kΩresistor 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
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
_______________________________________________________________________________________ 9
MAX1508
MAX1508Y
MAX1508Z
1µF
2.8kΩ
IN
CHG
1µF
4.2V Li+
BATT
EN (EN)
GND
SYSTEM
VL
ISET
AC/DC
ADAPTER
VI/O
VI/O
CHARGE-CURRENT MONITOR
LOW: CHARGE, HIGH: FULL OR OFF
ACOK
0.47µF
( ) ARE FOR THE MAX1508Y ONLY
Figure 3. µP-Interfaced Li+ Battery Charger
MAX1508
MAX1508Y
MAX1508Z
1µF
15.4kΩ
4.3kΩ
IN
CHG
1µF
4.2V Li+
BATT
EN (EN)
N
GND
SYSTEM
VL ACOK
ISET
USB PORT
VBUS
GND
D+
D-
VI/O
VI/O
HIGH: 435mA, LOW: 95mA
0.47µF
( ) ARE FOR THE MAX1508Y ONLY
Figure 4. USB Battery Charger
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, DFN THIN.EPS
L
CL
C
PIN 1
INDEX
AREA
D
E
L
e
L
A
e
E2
N
G
1
2
21-0137
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
-DRAWING NOT TO SCALE-
k
e
[(N/2)-1] x e
REF.
PIN 1 ID
0.35x0.35
DETAIL A
b
D2
A2
A1
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
10 ______________________________________________________________________________________
MAX1508
MAX1508Y
MAX1508Z
1µF
INPUT
4.25V TO 13V
2.80kΩ
IN
EN (EN)
VL
CHG
1µFLi+
4.2V
BATT
ISET
GND
0.47µF
OFF
ON
ACOK
( ) ARE FOR THE MAX1508Y ONLY
Typical Operating CircuitOrdering Information (continued)
PART
TEMP RANGE
PIN-PACKAGE
TOP
MARK
MAX1508YETA-T
-40°C to +85°C8 Thin DFN-EP*
AIL
MAX1508YETA+T
-40°C to +85°C8 Thin DFN-EP*
AIL
MAX1508ZETA-T
-40°C to +85°C8 Thin DFN-EP*
AIK
MAX1508ZETA+T
-40°C to +85°C8 Thin DFN-EP*
AIK
*EP = Exposed paddle.
+Denotes lead-free package.
MAX1508/MAX1508Y/MAX1508Z
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm 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 ____________________ 11
©2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
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.)
COMMON DIMENSIONS
SYMBOL MIN. MAX.
A0.70 0.80
D2.90 3.10
E2.90 3.10
A1 0.00 0.05
L0.20 0.40
PKG. CODE ND2 E2 eJEDEC SPEC b[(N/2)-1] x e
PACKAGE VARIATIONS
0.25 MIN.k
A2 0.20 REF.
2.30±0.101.50±0.106T633-1 0.95 BSC MO229 / WEEA 1.90 REF0.40±0.05
1.95 REF0.30±0.05
0.65 BSC
2.30±0.108T833-1
2.00 REF0.25±0.05
0.50 BSC
2.30±0.1010T1033-1
2.40 REF0.20±0.05- - - -
0.40 BSC
1.70±0.10 2.30±0.1014T1433-1
1.50±0.10
1.50±0.10
MO229 / WEEC
MO229 / WEED-3
0.40 BSC - - - - 0.20±0.05 2.40 REFT1433-2 14 2.30±0.101.70±0.10
T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF
T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF
T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF
-DRAWING NOT TO SCALE-
G2
2
21-0137
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
DOWNBONDS
ALLOWED
NO
NO
NO
NO
YES
NO
YES
NO