MAXIM MAX8600, MAX8601 Technical data

General Description

The MAX8600/MAX8601 single-/dual-input linear bat­tery chargers safely charge single-cell Li+ batteries.
The charging rate is optimized to accommodate the
thermal characteristics of a given application. There is
no need to reduce the maximum charge current or
worst-case charger power dissipation. Charging is opti­mized for Li+ cells using a control algorithm that
includes low-battery precharging, voltage and current­limited fast-charging, and top-off charging, while con­tinuously monitoring the battery for overvoltage,
over/undertemperature, and charging time. The charg­er timeout protection is programmable. The charger
status is indicated by three open-drain outputs.

The MAX8601 automatically selects between either a
USB or AC adapter input source. The AC adapter
charge current is programmable, while USB charge
current is set not to exceed either 100mA or 500mA,
depending on the USEL input. The MAX8600 is a sin­gle-input charger with no USB source input.

The MAX8600/MAX8601 are available in the tiny 3mm x
3mm power-enhanced TDFN package.

Applications

Cell Phones Portable Media Players

Digital Cameras MP3 Players

PDAs Wireless Appliances

Features

♦ Single- (MAX8600) or Dual- (MAX8601) Input Li+

Charger

♦ Up to 1A Programmable Fast-Charge

♦ 100mA/500mA USB Select Input (MAX8601)

♦ ±5% Fast-Charge Current-Limit Accuracy

♦ 14V Input Overvoltage Protection

♦ Programmable On-Chip Charge Timers

♦ Battery Thermistor Input

♦ Charger-Status Outputs

♦ Thermally Optimized Charge Rate

♦ 14-Pin 3mm x 3mm TDFN Package

MAX8600/MAX8601

Single-/Dual-Input 1-Cell Li+ Chargers with

OVP Protection and Programmable Charge Timer

________________________________________________________________ Maxim Integrated Products 1

19-3565; Rev 2; 7/08

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

PART

TEMP

PIN-PACKAGE

TOP

PKG

CODE

MAX8600ETD

-40°C to

T1433-2

MAX8601ETD

-40°C to

T1433-2

Pin Configurations continued at end of data sheet.

BAT

Li+

CT

THM

AC

ADAPTER

USB

PORT

GND

USB

EN

OFF

ON

FLT

+5V

CHARGE
STATUS

DC

SETI

USEL

POK

CHG

MAX8601

500mA

100mA

Typical Operating Circuit

8

9

10

11

12

13

14

7

6

5

4

3

2

1

MAX8600

TDFN

TOP VIEW

SETI

BAT

THM

GND

CT

N.C.

N.C.

FLT

DC

DC

CHG

POK

N.C.

EN

Pin Configurations

*EP = Exposed pad.

RANGE

+85°C

+85°C

14 TDFN-EP* 3mm
x 3mm (T1433-2)

14 TDFN-EP* 3mm
x 3mm (T1433-2)

MARK

ABB

AAC

MAX8600/MAX8601

Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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

BAT, CT,

CHG, EN, FLT, SETI,

POK, THM, USEL to GND..................................-0.3V to +6.0V

Continuous Power Dissipation (T

A

= +70°C)
14-Pin TDFN 3mm x 3mm (derate 18.2mW/°C

above +70°C)............................................................ 1454mW

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

ELECTRICAL CHARACTERISTICS

(VDC= V

USB

= 5V, V

BAT

= 4V, VEN= 0V, R

SETI

= 2kΩ, CCT= 0.068µF, TA= -40°C to +85°C, unless otherwise noted. Typical values

are at T

A

= +25°C. Note 1)

PARAMETER CONDITIONS

DC OR USB (Note 2)

Input Voltage Range 014V

Input Operating Range (Note 3)

V

Input Undervoltage Threshold

Input rising, 500mV hysteresis (typ)

4.0

V

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

Input Overvoltage Delay From overvoltage event to charger disabled

s

Input Supply Current I

BAT

= 0mA, R

THM

= 10kΩ

µA

Shutdown Input Current VEN = 5V, TA = +25°C

µA

Input to BAT On-Resistance Input = 3.7V, V

BAT

= 3.6V 0.5 0.8 Ω

Input to BAT Dropout Voltage

Input falling, 200mV hysteresis (typ) 5 55

mV

BAT

TA = +25°C

4.2

BAT Regulation Voltage I

BAT

= 0mA

T

A

= -40°C to +85°C

4.2

V

BAT Restart Fast-Charge
Threshold

From BAT regulation voltage

mV

R

SETI

= 1.5kΩ

R

SETI

= 2kΩ

R

SETI

= 5kΩ

DC Charging Current V

USB

= 0V

Prequal, R

SETI

= 2kΩ, V

BAT

= 2.5V 60 75 90

mA

V

USEL

= 5V

V

USEL

= 0V 80 95

USB Charging Current VDC = 0V

Prequal, R

SETI

= 2kΩ, V

BAT

= 2.5V 60 75 90

mA

Soft-Start Time Ramp time to fast-charge current 1.2 ms

BAT Prequal Threshold V

BAT

rising, 180mV hysteresis (typ) 2.9 3 3.1 V

BAT Leakage Current VDC = V

USB

= 0V, V

BAT

= 4.2V

5µA

SETI

R

SETI

Resistance Range (Note 4) 1.5 5.0 kΩ

MIN TYP MAX UNITS

4.15 7.00

3.85

0.25

750 1200

275 435

4.179

4.166

-180 -150 -120

950 1000 1050

727 750 773

280 300 320

450 475 500

0.001

4.15

120

4.221

4.234

100

MAX8600/MAX8601

Single-/Dual-Input 1-Cell Li+ Chargers with

OVP Protection and Programmable Charge Timer

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDC= V

USB

= 5V, V

BAT

= 4V, VEN= 0V, R

SETI

= 2kΩ, CCT= 0.068µF, TA= -40°C to +85°C, unless otherwise noted. Typical values

are at T

A

= +25°C. Note 1)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

EN, USEL

Rising 1.6

Logic Input Thresholds

Falling 0.4

V

TA = +25°C

1

Logic Input Leakage Current

V EN = V

USEL

= 0 to 5.5V

T

A

= +85°C

µA

POK, CHG, FLT

Logic Output Voltage, Low I

POK,

= I

CHG

= I

FLT

= 1mA 12

mV

TA = +25°C

1

Logic Output Leakage
Current, High

V

POK

= V

CHG

= V

FLT

= 5.5V,

V

DC

= V

USB

= 0V

T

A

= +85°C

µA

CHG

R

SETI

= 1.5kΩ 75

R

SETI

= 2kΩ

CHG/Top-Off Threshold

I

BAT

falling, battery is

charged

R

SETI

= 5kΩ

mA

THM

THM Pullup Resistance 10 kΩ

THM Resistance, Hot R

THM

falling, 420Ω hysteresis (typ)

kΩ

THM Resistance, Cold R

THM

rising, 2.7kΩ hysteresis (typ)

kΩ

THM Resistance, Disabled R

THM

falling, 230Ω hysteresis (typ)

Ω

CT

Timer Accuracy CCT = 0.068µF -20

%

Prequal Time Limit From entering prequal to FLT low, V

BAT

< 3V

min

Charge Time Limit From entering fast-charge to FLT low, 3V < V

BAT

< 4.2V

min

Top-Off Time Limit From CHG high to charger disabled

min

THERMAL LOOP

Thermal-Limit Temperature

Juncti on tem p er atur e w hen the char g e cur r ent i s r ed uced ,
T

J

r i si ng

°C

Thermal-Limit Gain

mA/°C

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

and characterization.

Note 2: Input refers to either DC or USB.
Note 3: Guaranteed by undervoltage- and overvoltage-threshold testing. For complete charging, the input voltage must be greater

than 4.32V. See the Applications Information section.

Note 4: Guaranteed by the current-limit test.

Reduction of I

for increase of TJ, from VDC, R

BAT

= 1.5kΩ -50

SETI

0.001

0.01

0.001

0.01

37.5 56.25 75.0

22.5

3.72 3.94 4.13

26.7 28.3 29.7

274 309 337

34.8

334

34.8

+100

100

+20

MAX8600/MAX8601

Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VDC= 5V, R

SETI

= 2kΩ, V

BAT

= 3.6V, MAX8601 evaluation kit with thermal resistance of 50°C/W. TA= +25°C, unless otherwise noted.)

0

300

200

100

500

400

900

800

700

600

1000

0 2 4 6 8 10 12 14

SUPPLY CURRENT vs. INPUT VOLTAGE

MAX8600/01 toc01

INPUT VOLTAGE (V)

SUPPLY CURRENT (μA)

VEN = 0V

0

300

200

100

500

400

900

800

700

600

1000

02468101214

DISABLED SUPPLY CURRENT

vs. INPUT VOLTAGE

MAX8600/01 toc02

INPUT VOLTAGE (V)

SUPPLY CURRENT (μA)

VEN = 5V

0

200

400

600

800

1000

01.00.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5

CHARGE CURRENT

vs. BATTERY VOLTAGE

MAX8600/01 toc03

V

BAT

(V)

CHARGE CURRENT (mA)

DASHED DATA TAKEN
WITH PULSE TESTING TO
AVOID THERMAL LIMIT

R

SETI

= 1.5kΩ

R

SETI

= 2kΩ

R

SETI

= 3kΩ

0

200

400

600

800

1000

02468101214

CHARGE CURRENT

vs. DC VOLTAGE

MAX8600/01 toc04

VDC (V)

CHARGE CURRENT (mA)

R

SETI

= 1.5kΩ

R

SETI

= 2kΩ

R

SETI

= 3kΩ

DASHED DATA
TAKEN WITH PULSE
TESTING TO AVOID
THERMAL LIMIT

0

200

100

400

300

700

600

500

800

04268101214

CHARGE CURRENT vs. USB VOLTAGE

MAX8600/01 toc05

V

USB

(V)

CHARGE CURRENT (mA)

V

USEL

= 0V

V

USEL

= 5V

DASHED DATA TAKEN WITH
PULSE TESTING TO AVOID THERMAL LIMIT

0

200

100

400

300

600

500

700

900

800

1000

0 0.2 0.3 0.40.1 0.5 0.6 0.7 0.90.8 1.0

CHARGE CURRENT vs. INPUT

VOLTAGE HEADROOM

MAX8600/01 toc06

(VIN - V

BAT

) (V)

CHARGE CURRENT (mA)

4.180

4.190

4.185

4.200

4.195

4.205

4.210

-40 10-15 35 60 85

BATTERY REGULATION

VOLTAGE vs. AMBIENT TEMPERATURE

MAX8600/01 toc07

TA (°C)

BATTERY REGULATION VOLTAGE (V)

0

300

200

100

400

500

600

700

800

900

1000

-40 10-15 35 60 85

CHARGE CURRENT vs. AMBIENT

TEMPERATURE (750mA CHARGE)

MAX8600/01 toc08

TA (°C)

CHARGE CURRENT (mA)

V

BAT

= 4V

V

BAT

= 3.6V

MAX8600/MAX8601

Single-/Dual-Input 1-Cell Li+ Chargers with

OVP Protection and Programmable Charge Timer

_______________________________________________________________________________________ 5

PIN

MAX8600

NAME

FUNCTION

1 1, 7 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. Connect both BAT inputs
together externally (MAX8601). BAT is high impedance when the IC is disabled.

2 2 SETI

DC Charge-Current Programming Input. Connect a resistor from SETI to GND to set the
maximum charging current when using the DC input, the prequal current from either input, and
the CHG turn-off threshold.

3 3 THM

Thermistor Input. Connect a 10kΩ NTC thermistor, in close proximity to the battery, from THM
to ground to monitor the battery temperature. Connect THM to GND to disable the thermistor
functionality. The IC suspends charging when R

THM

is outside the hot and cold limits.

4 4 GND Ground

55CT

Timing Capacitor Input. Connect a capacitor from CT to GND to set the precharge timeout,
top-off time, and fast-charge timeout. Connect CT to GND to disable the timers.

6, 7, 9 — N.C. No Connection. Make no external circuit connection.

88EN

Active-Low Enable Input. Drive low or connect EN to GND to enable the charger. Drive EN high
to disable the charger.

10 10 POK

Power-OK Monitor. POK is an open-drain output that pulls low when a valid charging source is
detected at either DC or USB (MAX8601). POK is high impedance when EN is high.

11 11 CHG

Charging-Status Output. CHG goes low when the battery is above 3V and being charged with
a current greater than 7.5% of the current programmed with R

SETI

. CHG is high impedance

when the charger is in prequal, top-off, or disabled.

Pin Description

Typical Operating Characteristics (continued)

(VDC= 5V, R

SETI

= 2kΩ, V

BAT

= 3.6V, MAX8601 evaluation kit with thermal resistance of 50°C/W. TA= +25°C, unless otherwise noted.)

100

400

300

200

500

600

700

800

900

1000

1100

-40 10-15 35 60 85

CHARGE CURRENT vs. AMBIENT

TEMPERATURE (1A CHARGE)

MAX8600/01 toc09

TA (°C)

CHARGE CURRENT (mA)

V

BAT

= 4V

V

BAT

= 3.6V

R

SETI

= 1.5kΩ

0

100

200

300

400

500

600

700

800

0.010 0.045 0.080 0.115 0.150

FAST-CHARGE TIME vs. C

CT

MAX8600/01 toc10

CCT (μF)

FAST-CHARGE TIME (MIN)

MAX8601

MAX8600/MAX8601

Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer

6 _______________________________________________________________________________________

PIN

MAX8600

NAME

FUNCTION

12, 13 12, 13 DC

DC Input Supply. Connect DC to a 4.5V to 7V charging source. Bypass DC to GND with a 1µF
or larger capacitor. DC takes priority over USB when both are present (MAX8601). Both DC
inputs should be connected together externally.

14 14 FLT

Fault Status Output. FLT goes low when either the prequal timer or the fast-charge timers
expire and the battery voltage is not above the required threshold. Clear the fault by raising EN
or removing input power.

— 9 USB

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

—6

USB Charge-Select Input. Logic input that determines the maximum charge current drawn
from the USB input. I

BAT

= 95mA when USEL = low, and I

BAT

= 475mA when USEL = high.

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

Pin Description (continued)

ANY STATE

FAULT

CHG = HIGH

FLT = LOW

V

BAT

> 3V

R

THM

> 3.97kΩ AND

R

THM

< 28.7kΩ

R

THM

> 3.97kΩ AND

R

THM

< 28.7kΩ

R

THM

< 3.97kΩ OR

R

THM

> 28.7kΩ

R

THM

< 3.97kΩ OR

R

THM

> 28.7kΩ

I

BAT

< 112.5 / R

SETI

AND VOLTAGE MODE

V

IN

< 4.1V OR

V

IN

< 7.5V OR

V

IN

< V

BAT

OR

EN HIGH

V

BAT

< 3V AND
PREQUAL
TIMEOUT

I

BAT

> 112.5 / R

SETI

AND FAST-CHARGE

TIMEOUT

TOP-OFF
TIMEOUT

OFF

POK = HIGH, CHG = HIGH, FLT = HIGH

I

BAT

= 0A

EN LOW AND
POWER-GOOD

PREQUAL

POK = LOW, CHG = HIGH

I

BAT

= 150 / R

SETI

DONE

POK = LOW, CHG = HIGH

I

BAT

= 0A

TOP-OFF

POK = LOW, CHG = HIGH

FAST-CHARGE

POK = LOW, CHG = LOW

I

BAT(DC)

= 1500 / R

ISET

I

BAT(USB)

= 100mA / 500mA

THM OUT OF RANGE

POK = PREVIOUS STATE
CHG = PREVIOUS STATE

I

BAT

= 0A

PREQUAL TIMER HELD

THM OUT OF RANGE

POK = PREVIOUS STATE
CHG = PREVIOUS STATE

I

BAT

= 0A

FAST-CHARGE TIMER HELD

Figure 1. Charger State Diagram

MAX8601

USEL

Detailed Description

DC Charging

The MAX8600/MAX8601 are designed to charge a sin­gle-cell Li+ battery from a DC source voltage between

4.5V and 7V. The precharge current, charge current,
and top-off threshold are programmable with R

SETI

.

USB Charging (MAX8601)

The MAX8601 contains a USB input that allows opera­tion from either a DC source or a USB port. A USEL input
allows the user to select either a 100mA or 500mA maxi­mum charging current when using the USB input. If both
V

USB

and VDCare valid, the MAX8601 operates from

DC. If V

DC

is invalid (undervoltage/overvoltage), the
MAX8601 operates from USB. When charging at 100mA
from the USB input, the fast-charge timer is inhibited.

EN

Charger-Enable Input

EN is a logic input (active low) that enables the charger.
Drive EN high to disable the charger-control circuitry.
Drive EN low or connect to GND for normal operation.

Soft-Start

To prevent input transients, the rate of change of
charging current is limited. When the charger is turned
on or when the input source is changed, charge current
is ramped from 0 to the set current value in typically

1.2ms. This also means that if charging is taking place
from USB, and the DC input is then powered, charge
current falls to zero and then is reramped to the DC
charge rate. This is done to ensure that the DC source
is not subjected to a severe load current step.

Charge-current ramp up is also limited when transition­ing from prequal to fast-charge, and when changing
the USB charge current from 100mA to 500mA with
USEL. There is no di/dt limiting, however, if I

SET

is

changed suddenly using a switch at R

SETI

.

Thermal-Limit Control

The MAX8600/MAX8601 feature a thermal limit that
reduces the charge current when the die temperature
exceeds +100°C. As the temperature increases above
+100°C, the IC lowers the charge current by 50mA/°C.

CHG

Charge-Indicator Output

CHG is an open-drain output that indicates charger sta­tus. CHG goes low during charge cycles where V

BAT

is

greater than 3V and I

BAT

is greater than 7.5% of the

maximum charge current set by R

SETI

. When the
MAX8600/MAX8601 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 20mA for
an LED charge indicator.

Fault Indicator (

FLT

)

The MAX8600/MAX8601 contain an open-drain FLT
output to signal the user when a fault occurs. FLT goes
low if the charger is in prequal and the prequal timer
expires, or if the charger is in fast-charge and the fast­charge time expires. FLT does NOT go low if the THM
thermistor temperature is out of range. Toggle EN or
the input power to reset the FLT indicator.

Power-OK Indicator (

POK

)

The MAX8600/MAX8601 contain an open-drain POK
output that goes low when a valid input source is
detected at DC or USB (MAX8601 only). A valid input
source is one whose voltage is between 4.5V and 7V
and exceeds the battery voltage by 240mV. 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 55mV.
POK is high impedance when the charger is disabled.

Applications Information

Figure 2 shows the typical operating circuit for the
MAX8601. The following section describes component
changes for different charging current and timer durations.

MAX8600/MAX8601

Single-/Dual-Input 1-Cell Li+ Chargers with

OVP Protection and Programmable Charge Timer

_______________________________________________________________________________________ 7

BAT

NTC

10kΩ AT

+25°C

R

SETI

2kΩ

CT

THM

AC ADAPTER

4.5V TO 7V

(OVP TO 16V)

USB PORT

4.5V TO 5.5V

GND

USB

EN

OFF

ON

FLT

TO LOGIC
SUPPLY
(3.3V)

100kΩ 100kΩ 330Ω

FAULT

POWER-OK

C

CT

0.068μF

1μF

DC

SETI

USEL

POK

CHG

MAX8601

500mA

100mA

2.2μF

Figure 2. Typical Operating Circuit for USB/AC-Adapter Input
Charger. An R

SETI

of 2kΩ sets an AC adapter fast-charge of

750mA.

MAX8600/MAX8601

Charge Current Selection

The maximum charging current from a supply connect­ed to DC is programmed by an external resistor (R

SETI

)

connected from SETI to GND. Calculate the R

SETI

value

as follows:

R

SETI

= 1500 / I

CHARGE(MAX)

where I

CHARGE(MAX)

is in amps and R

SETI

is in ohms.
SETI can also be used to monitor the actual charge­current level. The output voltage at SETI is proportional
to the charging current as follows:

V

SETI

= (I

CHARGE

x R

SETI

) / 1000

Note that the prequal current for both USB and DC
input operation is 1/10 of the fast-charge current set by
R

SETI

. Also, the top-off charge-current threshold for
both USB and DC input operation is set to 7.5% of the
fast-charge current set by R

SETI

.

I

PREQUAL

= 150 / R

SETI

I

TOP-OFF

= 112.5 / R

SETI

Timer Capacitor Selection

The MAX8600/MAX8601 contain timers for prequal,
fast-charge, and top-off operation. These time periods
are determined by the capacitance from CT to GND. To
set the charge times, calculate CCTas follows:

T

FASTCHARGE

= 334min x (CCT/ 0.068µF)

T

PREQUAL

= T

TOPOFF

= 34.8min x (CCT/ 0.068µF)

Note that when charging at 100mA from the USB input
(MAX8601), the fast-charge timer is inhibited. When THM
halts charging, the timers stop and hold their value.

Battery Temperature Control

The MAX8600/MAX8601 monitor battery temperature
through a negative TC thermistor which is in close ther­mal contact with the battery. Select a thermistor resis­tance that is 10kΩ at +25°C and has a beta of 3500.
The IC compares the resistance from THM to GND and
suspends charging when it is greater than 28.3kΩ or

less than 3.94kΩ, which translates to a temperature of
0°C to +50°C. Table 1 shows the nominal temperature
limits that result from a wide range of available thermis­tor temperature curves. The curves are defined by the
following equation:

where β is the BETA term in Table 1.

Connect THM to GND to disable the temperature-con­trol function. When R

THM

disables charging, all timers

pause and hold their value.

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 for the
MAX8601, 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 coefficients and
should be avoided.

Thermal Considerations

The MAX8600/MAX8601 are in a thermally enhanced
TDFN package with an exposed paddle. Connect the
exposed paddle of the package 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 IC to
charge the battery with maximum current, while mini­mizing the increase in die temperature. Note that the
MAX8600/MAX8601s’ thermal-limit control allows the
charger to be tolerant of thermally restricted PC board
layouts that are sometimes unavoidable in compact
portable designs. With such non-optimal layouts, the
charger still operates, but may reduce charge current
to manage temperature rise.

RR

T

TCe

=

+

⎛
⎝

⎜

⎞
⎠

⎟

⎛
⎝

⎜

⎞
⎠

⎟

⎡
⎣

⎢

⎤
⎦

⎥

⎧
⎨

⎪
⎩

⎪

⎫
⎬

⎪
⎭

⎪

°×

−

25

1

2731298

β

Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer

8 _______________________________________________________________________________________

THERMISTOR BETA 3000 3250 3500 3750

Resistance at +25°C 10,000Ω 10,000Ω 10,000Ω 10,000Ω
Resistance at +50°C 4587.78Ω 4299.35Ω 4029.06Ω 3775.75Ω
Resistance at 0°C 25,140.55Ω 27,148.09Ω 29,315.94Ω 31,656.90Ω
Nominal Hot Trip Temperature +55.14°C +52.60°C +50.46°C +48.63°C
Nominal Cold Trip Temperature -3.24°C -1.26°C +0.46°C +1.97°C

Table 1. Fault Temperatures for Different Thermistors

DC Input Sources

The MAX8600/MAX8601 operating input voltage range
is 4.15V to 7V. The device survives input 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

0.5Ω). Failure to meet this requirement results in an
incomplete charge or increased charge time.

Stand-Alone Li+ Charger

The MAX8600 provides a complete Li+ charging solu­tion. Figure 3 shows the MAX8600 as a stand-alone Li+
battery charger. The 2kΩ resistor connected to SETI
sets a charging current of 750mA. The LED indicates
when fast-charge has begun. When fast-charge is com­plete, the LED turns off.

USB-Powered Li+ Charger (MAX8601)

The universal serial bus (USB) provides a high-speed
serial communication port as well as power for the

MAX8600/MAX8601

Single-/Dual-Input 1-Cell Li+ Chargers with

OVP Protection and Programmable Charge Timer

_______________________________________________________________________________________ 9

BAT

Li+

CT

THM

VBUS

GND

D+

D-

500mA

USB PORT

GND

EN

FLT

V

I/O

USB

DC

USEL

SETI

POK

R5
100kΩ

C2

2.2μF

C1

1μF

C3

0.068μF

R1

2kΩ

R3, R4

100kΩ

R2
10kΩ

CHG

MAX8601

SYSTEM

Figure 4. USB Battery Charger with the MAX8601

BAT

Li+

CT

THM

AC

ADAPTER

GND

EN

FLT

+5V

CHARGE
STATUS

D1
GREEN LED

DC

SETI

POK

C1

1μF

R5
1kΩ

C3

2.2μF

C4

0.068μF

R1

2kΩ

R3, R4

100kΩ

R2
10kΩ

CHG

MAX8600

OFF

ON

Figure 3. Stand-Alone Li+ Battery-Charger with the MAX8600

MAX8600/MAX8601

remote device. The MAX8601 can be configured to
charge its battery at the highest current possible from
the host port. Figure 4 shows the MAX8601 configured
as a USB battery charger. A USEL input sets the maxi­mum charging current from the USB input at 100mA or
500mA.

Layout and Bypassing

Connect the input capacitors 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 BAT as close to the IC 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 MAX8601
evaluation kit.

Chip Information

TRANSISTOR COUNT: 6838

PROCESS: BiCMOS

Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer

10 ______________________________________________________________________________________

TOP VIEW

8

9

10

11

12

13

14

7

6

5

4

3

2

1

MAX8601

TDFN

SETI

BAT

THM

GND

CT

USEL

BAT

FLT

DC

DC

CHG

POK

USB

EN

Pin Configurations (continued)

MAX8600/MAX8601

Single-/Dual-Input 1-Cell Li+ Chargers with

OVP Protection and Programmable Charge Timer

______________________________________________________________________________________ 11

6, 8, &10L, DFN THIN.EPS

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

.)

MAX8600/MAX8601

Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer

12 ______________________________________________________________________________________

COMMON DIMENSIONS

SYMBOL MIN. MAX.

A 0.70 0.80
D 2.90 3.10
E 2.90 3.10
A1

0.00 0.05

L 0.20 0.40

PKG. CODE N D2 E2 e JEDEC SPEC b

[(N/2)-1] x e

PACKAGE VARIATIONS

0.25 MIN.k

A2 0.20 REF.

2.00 REF0.25±0.050.50 BSC2.30±0.1010T1033-1

2.40 REF0.20±0.05- - - - 0.40 BSC1.70±0.10 2.30±0.1014T1433-1

1.50±0.10 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

2.30±0.10 MO229 / WEED-3 2.00 REF0.25±0.050.50 BSC1.50±0.1010T1033-2

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

.)

MAX8600/MAX8601

Single-/Dual-Input 1-Cell Li+ Chargers with

OVP Protection and Programmable Charge Timer

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 ____________________ 13

© 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

REVISIO N

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DATE

DESCRIPTION

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CHANGED

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