LTC4052-4.2 [Linear]

Lithium-Ion Battery Pulse Charger with Overcurrent Protection; 锂离子电池脉冲充电器具有过电流保护


型号：	LTC4052-4.2
厂家：	Linear
描述：	Lithium-Ion Battery Pulse Charger with Overcurrent Protection 锂离子电池脉冲充电器具有过电流保护电池脉冲过电流保护
文件：	总12页 (文件大小：167K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LTC4052-4.2

Lithium-Ion Battery

Pulse Charger with

Overcurrent Protection

FEATURES

DESCRIPTIO

■

Very Low Power Dissipation: 350mW at 1A

The LTC^®4052 is a complete standalone pulse charger

with integrated MOSFET for 1-cell lithium-ion batteries.

■

Complete Standalone Pulse Charger for 1-Cell

Lithium-Ion Batteries

Anexternalsenseresistorprovidesovercurrentlimitingas

a safety precaution against a user connecting a wall

adapter with the incorrect or no current limit. The internal

MOSFET prevents reverse battery current from flowing if

the input voltage is shorted to ground, eliminating the

need for a blocking diode.

■

Requires No Microcontroller, MOSFET or

Blocking Diode

■

Sense Resistor Limits Maximum Current for Safety

■

Programmable Charge Termination Timer for

Maximum Capacity Charging

±1% Float Voltage Accuracy

■

As the battery accepts charge and approaches the

programmed float voltage, the internal MOSFET begins

switchingoffandonwiththedutycyclegraduallydecreas-

ing as the battery approaches a fully charged condition.

A programmable timer terminates the charge cycle. The

near end-of-charge C/10 condition is indicated at the

CHRG pin when the average charge current falls to one-

tenth of the wall adapter current. Removing the input

voltage puts the LTC4052 into a sleep mode, dropping the

battery current drain to less than 1µA.

■

Near End-of-Charge (C/10) Detection Output

■

AC Wall Adapter Present Output

■

Low Battery Drain when Input Supply Is Removed

■

Automatic Trickle Charge for Low Battery

■

Automatic Battery Refresh

Thermal Shutdown Protection

■

^{Tiny Thermally E}U^{nhanced MSOP Package}

APPLICATIO S

■

Handheld Computers

The LTC4052 is available in a tiny 8-pin thermally

enhanced MSOP package.

■

Cellular Telephones

■

Cradle Chargers

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

Single Cell 4.2V, 1A, Standalone Li-Ion Battery Charger

LTC4052 Charge Profile

= 4.5V TO 10V

WITH 1A

4.5

CURRENT LIMIT

4.0

4.7Ω

1µF

10k

0.047µF

CHARGE

CYCLE

ENDS

3.5

3.0

1.0

0.5

SENSE

0.05Ω

CONSTANT

CURRENT

PULSING

CURRENT

LTC4052

GATE

CHARGE STATUS

AC PRESENT

0.022µF

CHRG

SENSE

ACPR

C/10

BAT

GND

1-CELL 4.2V

Li-Ion

BATTERY

TIMER

2.5

0.5

1.0

1.5

2.0

3.0

TIMER

0.1µF

TIME (HOURS)

4052 TA01

4052 • TA01b

405242f

LTC4052-4.2

W W U W

ABSOLUTE AXI U RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

ORDER PART

Input Supply Voltage (V_IN)....................................... 12V

BAT Voltage ...............................................–0.3V to 12V

GATE (Note 2) .............................................–0.3V to 8V

SENSE, TIMER..................................–0.3V to V_IN+0.3V

CHRG, ACPR .............................................–0.3V to 12V

SENSE, BAT Peak Current ...................................... 1.5A

Operating Temperature Range (Note 3) .. –40°C to 85°C

Junction Temperature (Note 4)............................. 125°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

NUMBER

TOP VIEW

SENSE 1

ACPR 2

8 BAT

7 GATE

6 CHRG

5 TIMER

LTC4052EMS8E-4.2

GND

MSE EXPOSED PAD PACKAGE

8-LEAD PLASTIC MSOP

T_JMAX= 125°C, θ_JA= 35°C/W

EXPOSED PAD IS GROUND.

(MUST BE SOLDERED TO PCB).

MS8 PART MARKING

LTYY

Consult LTC Marketing for parts specified with wider operating temperature ranges.

DC ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 25°C. V_IN= 6V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply Voltage

Input Quiescent Supply Current

Battery Float Voltage

Wall Adapter Open Circuit Voltage

Full Charge Mode

●

4.5

0.7

1.4

0°C ≤ T ≤ 85°C

4.158

4.137

4.200

4.242

BAT

●

Recharge Battery Voltage Threshold

Battery Voltage Falling 0°C ≤ T ≤ 85°C

3.990

3.969

4.050

4.110

RECHRG

●

– V Margin

RECHRG

150

105

225

120

MARGIN

IMAX

BAT

Overcurrent Trip Sense Voltage

Trickle Charge Current

= 2V

TRICKLE

BAT

Trickle Charge Threshold Voltage

Internal Switch On-Resistance

Rising

2.35

2.45

2.55

TRICKLE

= 2.6V

= 4V

0.45

0.35

0.7

0.5

Ω

DS(ON)

BAT

GATE Pin Voltage

= 2.6V

= 4V

6.5

10.5

GATE

BAT

TIMER Period Accuracy

= 0.1µF, Full Charge Mode

TIMER

±10

TIMER

Battery Leakage Current Through Charger

Sleep Threshold Voltage

= 4V, V = 0V

●

µA

LEAK

BAT

(V – V ) Low to High

(V – V ) High to Low

SLEEP

BAT

ACPR Pin Output Low Voltage

ACPR Pin Leakage Current

= 3mA

●

0.5

0.8

µA

ACPR

= 0, V

= 6V

LEAKACPR

ACPR

CHRG Pin Output Low Voltage

CHRG Pin Leakage Current

= 3mA, Charging, C/10 Not Reached

0.8

CHRG

= 0, V = 6V

CHRG

µA

LEAKCHRG

CHRG

CHRG Pin Weak Pull-Down Current

= 1V, Charging, C/10 Reached

CHRG

405242f

LTC4052-4.2

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

Note 4: Junction temperature T is calculated from the ambient

of a device may be impaired.

temperature T and power dissipation P according to the following

A D

formula: T = T + (P • θ °C/W)

Note 2: Absolute Maximum Rating for GATE pin applies only to externally

applied voltage. During normal operation the LTC4052-4.2’s internal

charge pump can generate GATE pin voltage exceeding absolute

maximum but it is internally current limited.

Note 3: The LTC4052EMS8E-4.2 is guaranteed to meet performance

specifications from 0°C to 70°C. Specifications over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 5. This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Trickle Charge Threshold Voltage

vs Temperature

Trickle Charge Current

vs Temperature

Trickle Charge Current vs Input

Supply Voltage

2.47

2.46

2.45

2.44

2.43

2.42

24.2

24.0

23.8

23.6

23.4

23.2

23.0

22.8

22.6

= 2V

BAT

= 25°C

TEMPERATURE (°C)

100 125

–50 –25

TEMPERATURE (°C)

100 125

–50 –25

(V)

4052 G02

4052 G01

4052 G03

Normalized Timer Duration

vs Temperature

Battery Float Voltage

vs Temperature

CHRG Pin C/10 Pulldown Current

vs Temperature

103

102

101

100

4.205

4.200

4.195

4.190

4.185

4.180

4.175

4.170

= 0.1µF

TIMER

100 125

TEMPERATURE (°C)

100 125

TEMPERATURE (°C)

100 125

–50 –25

TEMPERATURE (°C)

4052 G04

4052 G05

4052 G06

405242f

LTC4052-4.2

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Switch On-Resistance vs

Temperature

Overcurrent Sense Voltage

105.8

105.6

105.4

105.2

105.0

104.8

104.6

650

600

550

500

450

400

350

300

250

= 2.6V

BAT

= 4V

BAT

100 125

–50 –25

–25

125

–50

100

TEMPERATURE (°C)

4053 G07

4053 G08

PI FU CTIO S

SENSE (Pin 1): Overcurrent Sense Input. A sense resistor

(R_SENSE) should be connected from V_INto the SENSE pin

to program the current limit level. When overcurrent limit

is tripped, the pass transistor immediately turns off and

ON time, minimum OFF time and the overcurrent time-out

period all scale with t_TIMER

CHRG (Pin 6): Charge Status Open-Drain Output. When a

depleted battery is being charged, the CHRG pin is pulled

to ground by an internal N-channel MOSFET capable of

driving an LED. Once the duty cycle at the GATE pin drops

below 10%, the N-MOSFET turns off and a weak 40µA

current source to ground turns on to indicate a near end-

of-charge C/10 condition. When a time-out occurs or the

input supply is removed, the CHRG pin becomes high

impedance.

turns back on after a 640ms time-out period (C_TIMER

0.1µF). The on-off cycle will continue as long as the

overcurrent condition persists or until the timer runs out.

If overcurrent protection is not needed, short SENSE to

V_IN.

ACPR (Pin 2): AC Wall Adapter Present Open-Drain Out-

put. When the input voltage (wall adapter) is applied to the

LTC4052, this pin is pulled to ground by an internal

N-channel MOSFET capable of driving an LED.

GATE (Pin 7): Gate Drive Output Pin for Internal and

ExternalPassTransistors. AnexternalN-MOSFETtransis-

tor can be connected in parallel with the internal transistor

to reduce the on-resistance for higher charge current. In

this case, an external blocking diode on V_INis required to

prevent damage to the battery if V_INis shorted to ground.

A10µAcurrentsourcepullsthispinuptothechargepump

voltage when turned on and a 40µA current source pulls it

down to ground to turn it off. If an overcurrent condition

is detected, the GATE pin is immediately pulled to ground.

The voltage at this pin is internally clamped to 12V above

the GND pin.

V_IN(Pin 3): Positive Input Supply Voltage (4.5V ≤ V_IN≤

10V). Bypass this pin with a 1µF capacitor in series with a

4.7Ω resistor.

GND (Pin 4): Electrical Ground Connection and provides

a thermal path from the IC to the PC board copper. The

exposed backside of the package is also ground and must

be soldered to the PC board for maximum power dissipa-

tion.

TIMER (Pin 5): Timer Set Pin. The timer period is pro-

grammed by a capacitor (C_TIMER) to ground. The timer

period is: t_TIMER= (C_TIMER• 3Hr)/(0.1µF). The minimum

405242f

LTC4052-4.2

PI FU CTIO S

A series RC network from the GATE to the V_INpin is

required to control the slew rate at the V_INpin when the

switch is turned on or off. The slew rate control prevents

excessive current from the capacitor usually located in the

wall adapter from flowing into the battery when the pass

transistor turns on.

BAT (Pin 8): Battery Sense Input Pin. An internal resistor

divider presets the final float voltage to 4.2V. If the BAT pin

drops below 4.05V after the charge cycle has ended, the

timer resets and a new charge cycle begins. This pin is

clamped to 4.7V if the battery is disconnected while

charging.

BLOCK DIAGRA

ACPR

45mV

105mV

–

SLEEP

MAX

100ms

FILTER

10mΩ

BAT

SENSE

24mA

GND

GATE

BAT

CHARGE

PUMP

TRIPLER

OSCILLATOR

TIMER

TRICKLE FAST

–

CLK

MIN

CHRG

–

STOP

C/10

RECHRG

LOGIC

40µA

TIMERS

–

FLOAT

–

TEMP

MAX

THERMAL

SHUTDOWN

1.23V

REFERENCE

1.23V

4052 BD

405242f

LTC4052-4.2

OPERATIO

The LTC4052 is a complete lithium-ion battery pulse

charger with an internal 0.35Ω N-MOSFET switch driven

by an internal charge pump. The charge current is set by

the current limit of the input supply (wall adapter). An

external R_SENSEsets the maximum allowable charge

overcurrent and prevents a wall adapter with a high

currentlimitfromdamagingthebattery. Ifthecurrentlimit

of the input supply is above I_MAX, the charger will imme-

diately turn off the N-MOSFET switch and will retry after

640ms, thus reducing the average charge current to

tion in the pass transistor. The charge current is deter-

mined by the current limit of the input supply.

When the battery voltage reaches the final float voltage,

the pass transistor turns off for 100ms (minimum off-

time). It remains off as long as the battery voltage stays

above the float voltage after the 100ms off-time. After the

minimum off-time, if the battery voltage drops below the

float voltage, the pass transistor turns back on for at least

400ms(minimumon-time).Asthebatteryapproachesfull

charge, the off-time will get longer and the on-time will

stay at 400ms. When the N-MOSFET switch is on, the

voltage at the BAT pin will be slightly higher than the final

float voltage due to the ESR associated with the battery

pack. This voltage level should not be high enough to turn

on the overvoltage protection circuitry often located in the

battery pack. When the duty cycle at the GATE pin drops

below 10%, a comparator turns off the N-FET at the CHRG

pin and connects a weak current source (40µA) to ground

to indicate a near end-of-charge C/10 condition. The pulse

charging will continue until the timer stops.

approximately 1% of the overcurrent value (C_TIMER

0.1µF). If the battery is disconnected while in full charge

mode, the charge pump turns off when the voltage at the

BAT pin rises above 4.7V and turns back on when the

voltage drops below the float voltage.

A charge cycle begins when the voltage at the V_INpin rises

abovetheBATpinby45mV. Thechargerwillgointotrickle

charge mode if the battery voltage is below 2.45V. The

trickle charge current is preset to 24mA and is provided by

an internal current source. In trickle mode, both the pass

transistor and charge pump are off.

AnexternalcapacitorattheTIMERpinsetsthetotalcharge

time, the minimum on- and off-time and the overcurrent

retry period. After a time-out has occurred, the charge

cycle terminates and the CHRG pin is forced high imped-

ance. After the charging stops, if the battery voltage drops

below 4.05V due to external loading or internal battery

leakage current, a new charge cycle will automatically

resume.

When the cell voltage exceeds 2.45V, the charger goes

intofullchargemode.Inthismode,thechargepumpturns

on and ramps up the gate voltage of the pass transistor

turning it on. The current limited voltage at the V_INpin will

ramp down to V_BATplus the voltage drop across the pass

transistor and R_SENSE, thus reducing the power dissipa-

405242f

LTC4052-4.2

W U U

APPLICATIO S I FOR ATIO

The timer starts when an input voltage which is at least

40mV greater than V_BATis applied. After a time-out has

occurred, the charge cycle stops and the CHRG pin be-

comes high impedance.

Input Voltage (Wall Adapter)

The input voltage to the LTC4052 must have some

method of current limit capability. The current limit

level of the input power source must be lower than

the overcurrent limit (I_MAX) set by the sense resistor

I_MAX= 105mV/(R_SENSE+ 10mΩ). The 10mΩ represents

bond wire resistance internal to the IC. If a wall adapter

without current limit is used, or the current limit level is

above I_MAX, the charger will turn on briefly and then

immediately turn off when the overcurrent condition is

detected. This cycle will be resumed every 640ms (C_TIMER

=0.1µF)untilthetotalchargetimehasrunout.Ifovercurrent

protection is not needed, short the SENSE pin to V_IN. The

overcurrent limit selected should be approximately twice

the charge current (input supply current limit).

CHRG Status Output Pin

This open-drain output can report three different charger

conditions:

Charger Status

Not Charging

CHRG Pin Behavior

High Impedance

Charging

Strong Pulldown

Charging, C/10 Reached

Weak 40µA Pulldown

Using a simple two-resistor network a microprocessor

can distinguish all three states. See Figure 1.

Trickle Charge and Defective Battery Detection

At the beginning of the charge cycle, if the cell voltage is

low (less than 2.45V) the charger goes into a 24mA trickle

charge mode. If the low cell voltage persists for one

quarter of the total charge time, the battery is considered

defective and the charge cycle is terminated. The CHRG

pin output is then forced to a high impedance state.

620k

MICROPROCESSOR

OUT

LTC4052

CHRG

4052 F01

Figure 1. Interfacing with Microprocessor

Battery Charge Current

When the LTC4052 is charging a battery, an internal N-

MOSFET pulls the CHRG pin to ground. When C/10 is

reached, the strong NMOS pulldown is replaced by a weak

40µA current source pulldown. When the LTC4052 is not

charging a battery, the CHRG pin is high impedance.

The battery charge current is determined by the current

limit of the input supply (wall adapter). However, this

currentmustnotexceedthemaximumchargeovercurrent,

I_MAX. If an overcurrent condition is detected, the internal

switch immediately turns off, the GATE pin is pulled to

ground and the charge pump turns off. The charging will

resume after a 640ms time off (C_TIMER= 0.1µF).

Using the network in Figure 1, the microprocessor can

determine charger state using the following procedure:

1. Forcethedigitaloutputpin, OUT, highandreadthelogic

valueatthedigitalinput,IN.IfINreadslow,achargercycle

is in progress.

Programming the Timer

The programmable timer is used to terminate the charge

cycleandsettheminimumON/OFFtimeandtheovercurrent

time-off period. The length of the timer is programmed by

an external capacitor from the TIMER pin to ground. The

total charge time is:

2. If the IN pin is high, force the OUT pin to be high

impedance, then read the logic level at the IN pin again. If

IN is low, the charge cycle is still in progress, the timer is

still running, but the charge current has dropped below

10% of the programmed value indicating that the charge

cycle is nearly complete.

Time (Hours) = (3 Hours)(C_TIMER/0.1µF) or

C_TIMER= 0.1µF • Time (Hours)/3 (Hours)

3. IfthelogiclevelattheINpinishigh, thechargecyclehas

ended.

405242f

LTC4052-4.2

U U

APPLICATIO S I FOR ATIO

10µA/C

50µA/C

C/10 Detection (Near End-of-Charge)

The LTC4052 includes a comparator to monitor the duty

cycle at the GATE pin to detect when the battery is nearing

full charge. When the duty cycle falls below 10%, the

comparatortripsandturnsofftheN-MOSFETattheCHRG

pin and switches in a weak (40µA) current source to

ground. The 40µA turns off when the timer terminates the

charge cycle. C/10 detection is disabled in trickle charge

mode.

50µA/C

GATE

VOLTAGE

10µA/C

50µA/C

10µA/C

4052 TA02

Figure 2. Slew Rate at GATE and V Pins

with the RC Network from GATE to V

Internal Pass Transistor

For higher current applications an external power

N-channel MOSFET can be connected in parallel with the

internalpasstransistor. Becausethechargepumpoutputis

clamped to 12V above GND, the external MOSFET gate to

source voltage rating should be 16V or more.

AnN-channelMOSFET(0.35Ω)passtransistorisincluded

in the LTC4052. The gate of the MOSFET is controlled by

aninternalchargepump.Thebody isconnectedtoground

insteadofsourceterminal.Thereisnobodydiodefromthe

BAT pin back to the V_INpin; therefore, no blocking diode

is required in series with the battery or the input supply.

This will not only reduce cost but also reduce the heat

generated while in full charge mode. An internal thermal

shutdown circuit turns the pass transistor off if the die

temperature exceeds approximately 140°C with 5°C of

thermal hysteresis.

Thermal Considerations

The power handling capability is limited by the maximum

rated junction temperature (125°C) and the amount of PC

board copper used as a heat sink. The power dissipated by

the IC consists of two components:

1. Input supply quiescent current multiplied by the input

voltage

Gate Drive

The MOSFET gate drive consists of a regulated 10µA

current source charge pump. A series RC network is

required from the GATE pin to the V_INpin. When the

MOSFET is turned on, the voltage at the V_INpin will begin

slewing down to a voltage equal to V_BATplus the voltage

drop across the pass transistor and R_SENSE. The slew rate

is equal to 10µA/C. By ramping the V_INpin down slowly,

the inrush current is reduced. The resistor in series with

thecapacitorisrequiredtolimitthetransientcurrentwhen

the input supply is first applied.

2. The voltage drop across the switch (SENSE pin to BAT

pin) multiplied by the charge current

The LTC4052 has internal thermal shutdown designed to

protect the IC from overtemperature conditions. For con-

tinuous charging in the fast charge mode, the maximum

junction temperature must not be exceeded. It is important

to give careful consideration to all sources of thermal

resistancefromjunctiontoambient.Additionalheatsources

mounted nearby must also be considered.

Surface mount packages rely primarily on the PC board

coppertodissipatetheheatgeneratedbythepackagetothe

surrounding air. Since the PC board copper is the heat sink,

generous amounts of copper surrounding the package are

recommendedtoincreasetheeffectivenessoftheheatsink.

When the charge pump is turned off, a 50µA current

source to ground will start pulling the GATE voltage down.

Once the pass transistor is off, the voltage at the V_INpin

will begin slewing up with the rate equal to 50µA/C. With

thisexternalcapacitor,thevoltageattheV_INpinisramping

in a controlled manner (Figure 2).

405242f

LTC4052-4.2

U U

APPLICATIO S I FOR ATIO

In addition, feedthrough vias or plated through holes (lo-

cateddirectlybeneaththepackageandelsewhere)connect-

inginternalcopperandbacksidecopperlayershelptransfer

and spread the heat generated by the package.

soldered to the PC board is approximately 35°C/W de-

pending on the copper area. The junction temperature rise

above ambient will be approximately:

(0.353W)(35°C/W) = 12.36°C

Calculating Junction Temperature

The maximum junction temperature will be equal to the

maximum junction temperature rise above ambient plus

the maximum ambient temperature or:

Example: Find the maximum junction temperature for a

battery voltage of 4V (V will collapse to approximately

in the full charge mode), charge current of 1A and a

BAT

T_JMAX= 85°C + 12.36°C = 97.36°C

maximum ambient temperature of 75°C.

The power dissipated by the IC is:

P = (I_BAT• I_BAT• R_DS(ON)) + (V_IN• I_IN)

= (1A • 1A • 0.35Ω) + (4V • 0.7mA)

= 0.35 + 0.003

ACPR Output Pin

When the input voltage is 45mV higher than the voltage at

the BAT pin, the ACPR pin is pulled to ground to indicate

that the input supply (wall adapter) is applied. After the

input supply is removed, this pin will become high imped-

ance. An internal 100ms filter prevents the LTC4052 from

turning off if the voltage at the V_INpin rings and gets too

close to V_BATdue to parasitic inductance.

= 0.353W

The LTC4052 is available in an enhanced 8-pin MSOP

package which features an exposed copper pad on the

bottom of the package allowing it to be soldered directly to

the PC board copper for maximum heat transfer. This

greatly reduces the thermal resistance and increases the

power handling capability when compared to a standard

MSOP package. The junction to ambient thermal resis-

tance of this package when the backside of the package is

Stop Charging

The charger is off when the voltage at the V_INpin is less

than 45mV above V_BAT(sleep mode). The charge pump

and the internal pass transistor are turned off, and the

internal resistor divider is disconnected to reduce the

current drain on the battery in the sleep mode.

405242f

LTC4052-4.2

TYPICAL APPLICATIO

External N-MOSFET for Higher Charge Current

= 5V TO 10V WITH 2A CURRENT LIMIT

MBRS120T3

10k

0.047µF

4.7Ω

SENSE

PRESENT

25mΩ

1µF

STATUS

LTC4052

SENSE

CHARGE

STATUS

Si2302DS

CHRG

ACPR

GATE

BAT

0.022µF

1-CELL 4.2V

Li-Ion

BATTERY

TIMER

GND

TIMER

0.1µF

4052 TA03

405242f

LTC4052-4.2

PACKAGE DESCRIPTIO

MS8E Package

8-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1662)

BOTTOM VIEW OF

EXPOSED PAD OPTION

2.06 ± 0.102

(.080 ± .004)

1.83 ± 0.102

(.072 ± .004)

0.889 ± 0.127

(.035 ± .005)

2.794 ± 0.102

(.110 ± .004)

5.23

(.206)

MIN

3.2 – 3.45

(.126 – .136)

2.083 ± 0.102

(.082 ± .004)

3.00 ± 0.102

(.118 ± .004)

(NOTE 3)

0.52

(.206)

REF

0.65

(.0256)

BSC

0.42 ± 0.04

(.0165 ± .0015)

7 6

TYP

RECOMMENDED SOLDER PAD LAYOUT

3.00 ± 0.102

(.118 ± .004)

NOTE 4

4.90 ± 0.15

(1.93 ± .006)

DETAIL “A”

0.254

(.010)

0° – 6° TYP

GAUGE PLANE

0.53 ± 0.015

(.021 ± .006)

1.10

(.043)

MAX

0.86

(.034)

REF

DETAIL “A”

0.18

(.077)

SEATING

PLANE

0.22 – 0.38

(.009 – .015)

TYP

0.13 ± 0.076

(.005 ± .003)

0.65

(.0256)

BSC

MSOP (MS8E) 0802

NOTE:

1. DIMENSIONS IN MILLIMETER/(INCH)

2. DRAWING NOT TO SCALE

3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.

MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

405242f

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

LTC4052-4.2

TYPICAL APPLICATIO

Minimum Component Count 4.2V Li-Ion Battery Charger

= 5V TO 10V WITH 600mA CURRENT LIMIT

10k

0.047µF

LTC4052

SENSE

CHRG

ACPR

GATE

BAT

0.022µF

TIMER

GND

1-CELL 4.2V

TIMER

0.1µF

600mA

Li-Ion BATTERY

4052 TA04

RELATED PARTS

PART NUMBER DESCRIPTION

COMMENTS

LT1510-5

LTC1730

LTC1731

LTC1732

LTC1733

500kHz CC/CV Battery Charger

Most Compact, Up to 1.5A, Charges NiCd, NiMH, Li-Ion Cells

Battery Temperature Sensing, FAULT Output, SSOP-16 Package

CC/CV Charges Li-Ion Cells, 8-Lead MSOP

Li-Ion Battery Pulse Charger with Thermistor Interface

Li-Ion Battery Charger Controller

CC/CV Charges Li-Ion Cells, Automatic Battery Detection, 10-Lead MSOP

Li-Ion Battery Charger with Thermal Regulation

Standalone Charger, Constant-Current/Constant-Voltage/

Constant-Temperature, Integrated MOSFET, No External Sense Resistor

or Blocking Diodes

LTC1734/

LTC1734L

ThinSOT^TMLi-Ion Battery Charger

Only Two External Components, 50mA to 700mA I

Current Diode Required, No Sense Resistor Required

, No Reverse

CHARGE

LTC4050

LTC4053

Li-Ion Battery Charger Controller with Thermistor Interface Drives External MOSFET, 10-Lead MSOP

USB Compatible Li-Ion Battery Charger

Fully Integrated, Standalone USB Battery Charger, Thermal Regulation

Prevents Overheating, Charges from USB Port and/or Wall Adapter Input

LTC4054

Standalone, Monolithic Li-Ion Battery Charger in ThinSOT

C/10 Charge Termination, up to 800mA Charge Current

ThinSOT is a trademark of Linear Technology Corporation

405242f

LT/TP 0303 2K • PRINTED IN USA

12 ^{LinearTechnology Corporation}

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

LINEAR TECHNOLOGY CORPORATION 2001

(408) 432-1900 FAX: (408) 434-0507 www.linear.com

LTC4052-4.2 [Linear]

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