LTC1732EMS-4#TR [Linear]

LTC1732-4 & 4.2 - Lithium-Ion Linear Battery Charger Controller; Package: MSOP; Pins: 10; Temperature Range: -40°C to 85°C;


型号：	LTC1732EMS-4#TR
厂家：	Linear
描述：	LTC1732-4 & 4.2 - Lithium-Ion Linear Battery Charger Controller; Package: MSOP; Pins: 10; Temperature Range: -40°C to 85°C 电池控制器
文件：	总8页 (文件大小：152K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Final Electrical Specifications

LTC1732-4/LTC1732-4.2

Lithium-Ion Linear

Battery Charger Controller

October 2000

FEATURES

DESCRIPTIO

The LTC^®1732 is a complete constant-current/constant-

voltage linear charge controller for lithium-ion

(Li-Ion)batteries.Nickel-cadmium(NiCd)andnickelmetal-

hydride (NiMH) batteries can also be charged with con-

stant current using external termination. Charge current

can be programmed with 7% (max) accuracy using exter-

nal sense and program resistors. An internal resistor

divider and precision reference set the final float voltage

with 1% accuracy. The SEL pin allows users to charge

either 4.1V or 4.2V cells.

■

Complete Linear Charger Controller for 1-Cell

Lithium-Ion Batteries

■

Preset Charge Voltage with 1% Accuracy

■

4.5V to 12V Input Voltage Range

Programmable Charge Current

■

C/10 Charge Current Detection Output

■

Programmable Charge Termination Timer

■

Small, Thin 10-Pin MSOP Package

■

Select Pin to Charge Either 4.1V or

4.2V Cells (LTC1732-4)

■

Automatic Sleep Mode When Input Supply

Whentheinputsupplyisremoved,theLTC1732automati-

callyentersalowcurrentsleepmode,droppingthebattery

drain current to 7µA. An internal comparator detects the

end-of-charge (C/10) condition while a programmable

timer, using an external capacitor, sets the total charge

time.Fullydischargedcellsareautomaticallytricklecharged

at 10% of the programmed current until cell voltage

exceeds 2.457V.

is Removed (Only 7µA Battery Drain)

■

Automatic Trickle Charge of Low Voltage Cells

■

Programmable for Constant-Current-Only Mode

■

Battery Insertion Detect and Automatic Charging

of Low-Battery Cell

■

Input Supply (Wall Adapter) Detection Output

■

4.05V Recharge Threshold for 4.2V Cells

(LTC1732-4.2)

■

TheLTC1732beginsanewchargecyclewhenadischarged

batteryisconnectedtothechargerorwhentheinputpower

is applied. In addition, if the battery remains connected to

the charger and the cell voltage drops below 3.8V for the

LTC1732-4 or below 4.05V for the LTC1732-4.2, a new

charge cycle will begin.

3.8V Recharge Threshold for 4.1V or 4.2V Cells

(LTC1732-4)

APPLICATIONS

■

Cellular Phones

■

Handheld Computers

■

The LTC1732 is available in the 10-pin MSOP package.

Charging Docks and Cradles

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

TYPICAL APPLICATION

Single Cell 4.2V Li-Ion Battery Charger

= 6V

MBRM120T3

SEL

SENSE

1µF

0.2Ω

SENSE

DRV

Si9430DY

CHRG

ACPR

LTC1732-4

= 500mA

BAT

TIMER PROG

TIMER

0.1µF

4.2V

Li-Ion

CELL

GND

PROG

19.6k

10µF

1732 TA01

*SHUTDOWN INVOKED BY FLOATING THE PROG PIN

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.

LTC1732-4/LTC1732-4.2

W W U W

W U

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

(Note 1)

Input Supply Voltage (V_CC) ................................... 13.2V

SENSE, DRV, BAT, SEL, TIMER, PROG,

CHRG, ACPR ......................................... –0.3V to 13.2V

Operating Temperature Range (Note 2) .... –40° to 85°C

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

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

ORDER PART

NUMBER

TOP VIEW

BAT

SEL

CHRG

TIMER

GND

10 ACPR

LTC1732EMS-4

LTC1732EMS-4.2

SENSE

DRV

PROG

MS10 PART MARKING

MS10 PACKAGE

10-LEAD PLASTIC MSOP

T_JMAX= 140°C, θ_JA= 180°C/W

LTNJ

LTUA

Consult factory for Industrial and Military grade parts.

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

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

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply Voltage

Input Supply Current

●

4.5

Charger On, Current Mode

Shutdown Mode

Sleep Mode (Battery Drain Current)

●

µA

Regulated Output Voltage

LTC1732-4; 5V ≤ V ≤ 12V, V = GND

●

4.059

4.158

4.1

4.2

4.141

4.242

BAT

SEL

LTC1732-4/LTC1732-4.2; 5V ≤ V ≤ 12V, V

= V

SEL

Current Mode Charge Current

= 19.6k, R

= 0.2Ω

465

415

500

535

585

BAT

PROG

SENSE

●

= 97.6k, R

= 0.2Ω

100

140

110

PROG

SENSE

Trickle Charge Current

= 2V, R

= 19.6k, I

= (V – V

)/0.2Ω

SENSE

●

TRIKL

BAT

PROG

TRIKL

Trickle Charge Threshold Voltage

From Low to High

2.35

2.457 2.55

TRIKL

Undervoltage Lockout Voltage

Undervoltage Lockout Hysteresis

4.1

4.5

∆V

200

Manual Shutdown Threshold Voltage

PROG Pin Low to High

PROG Pin High to Low

2.457

2.446

MSD

Automatic Shutdown Threshold Voltage

(V – V ) High to Low

100

ASD

BAT

(V – V ) Low to High

BAT

Voltage Mode Disable Threshold Voltage

PROG Pin Current

= V – V

TIMER

0.4

DIS

Internal Pull-Up Current, No R

PROG Pin Source Current, ∆V

2.5

µA

PROG

≤ 5mV

●

300

PROG

PROG Pin Voltage

=19.6k

PROG

2.457

0.7

PROG

ACPR

CHRG

ACPR Pin Output Low Voltage

CHRG Pin Weak Pull-Down Current

CHRG Pin Output Low Voltage

SEL Pin Threshold

= 5mA

1.2

ACPR

= 1V

µA

CHRG

= 5mA

0.6

CHRG

SEL

0.3

LTC1732-4/LTC1732-4.2

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

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

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

End of Charge Indication Current Level

TIMER Accuracy

= 19.6k, R = 0.2Ω

SENSE

●

100

C/10

PROG

= 0.1µF

TIMER

V_RECHRG

Recharge Battery Voltage Threshold per Cell

from High to Low (LTC1732-4)

from High to Low (LTC1732-4.2)

3.72

3.95

3.80

4.05

BAT

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

of a device may be impaired.

Note 2: The LTC1732E 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.

PIN FUNCTIONS

BAT (Pin 1): Battery Sense Input. A bypass capacitor of

10µF or more is required to keep the loop stable when the

battery is not connected. A precision internal resistor

divider onthispinsetsthefinalfloatpotential.Theresistor

divider is disconnected in sleep mode to reduce the

current drain on the battery.

GND (Pin 5): Ground.

PROG (Pin 6): Charge Current Program and Shutdown

Input Pin. The charge current is programmed by connect-

ing a resistor, R_PROGto ground. The charge current is I_BAT

= (V_PROG• 800Ω)/(R_PROG• R_SENSE). The IC can be forced

into shutdown by floating the PROG pin and allowing the

internal 2.5µA current source to pull the pin above the

2.457V shutdown threshold voltage.

SEL(Pin2):4.1V/4.2VBatterySelectionInputPin.Ground-

ing this pin will set the output float voltage to 4.1V per cell,

whileconnectingtoV_CCwillsetthevoltageto4.2Vpercell.

For the LTC1732-4.2, the SEL pin must be connected to

V_CC.

DRV (Pin 7): Drive Output Pin for the P-Channel MOSFET

or PNP Transistor. The impedance is high at this pin,

therefore, a high gain PNP pass transistor should be used.

CHRG (Pin 3): Open-Drain Charge Status Output. When

the battery is being charged, the CHRG pin is pulled low by

an internal N-channel MOSFET. When the charge current

dropsto10%ofthefull-scalecurrentformorethan15ms,

the N-channel MOSFET turns off and a 35µA current

source is connected from the CHRG pin to GND. When the

timer runs out or the input supply is removed, the current

source will be disconnected and the CHRG pin is forced

into a high impedance state.

V_CC(Pin 8): Positive Input Supply Voltage. When V_BATis

within 54mV of V_CC, the LTC1732 is forced into sleep

mode, dropping I_CCto 7µA. V_CCranges from 4.5V to 12V.

Bypass this pin with a 1µF capacitor.

SENSE (Pin 9): Current Sense Input. A sense resistor,

R_SENSE, must be connected from V_CCto the SENSE pin.

This resistor is chosen using the following equation:

R_SENSE= (V_PROG• 800Ω)/(R_PROG• I_BAT

)

TIMER (Pin 4): Timer Capacitor and Constant-Voltage

ACPR (Pin 10): Wall Adapter Present Output. When the

inputvoltage(walladaptor)isappliedtotheLTC1732, this

pin is pulled to ground by an internal N-channel MOSFET

that is capable of sinking 5mA to drive an external LED.

Mode Disable Input Pin. The timer period is set by placing

a capacitor, C_TIMER, to GND. The timer period is t_TIMER

(C_TIMER• 3 hours)/(0.1µF). When the TIMER pin is

connected to V_CC, the timer is disabled, the constant-

voltage mode is disabled and the chip will operate in

constant-current mode only. Shorting the TIMER pin to

GND will disable the internal timer function and the C/10

function.

LTC1732-4/LTC1732-4.2

BLOCK DIAGRA

3.8V

–

SENSE

–

800Ω

80Ω

–

54mV

CHRG

–

C/10 STOP RECHRG C/10

35µA

720Ω

DRV

BAT

ACPR

SHDN

LOGIC

–

SLP

LBO

TIMER

ACPR

OSCILLATOR

COUNTER

SEL

REF

–

2.5µA

REF

2.457V

CHARGE

PROG

GND

1732 BD

BATTERY CURRENT I

= (2.457V • 800Ω)/(R

• R

)

SENSE

BAT

PROG

OPERATIO

The LTC1732 is a linear battery charger controller. The

charge current is programmed by the combination of a

program resistor (R_PROG) from the PROG pin to ground

and a sense resistor (R_SENSE) between the V_CCand SENSE

pins. R_PROGsets a program current through an internal

trimmed 800Ω resistor setting up a voltage drop from V_CC

to the input of the current amplifier (CA). The current

amplifierservosthegateoftheexternalP-channelMOSFET

to force the same voltage drop across R_SENSEwhich sets

the charge current. When the potential at the BAT pin

approaches the preset float voltage, the voltage amplifier

(VA) will start sinking current which shrinks the voltage

drop across R_SENSE, thus reducing the charge current.

Charging begins when the potential at V_CCpin rises above

the UVLO level and a program resistor is connected from

the PROG pin to ground. At the beginning of the charge

cycle, if the battery voltage is below 2.457V, the charger

goes into trickle charge mode. The trickle charge current

is10%ofthefull-scalecurrent. Ifthecellvoltagestayslow

for one quarter of the total charge time, the charge

sequence will terminate.

LTC1732-4/LTC1732-4.2

OPERATIO

The charger goes into the fast charge constant-current

mode after the voltage on the BAT pin rises above 2.457V.

In constant-current mode, the charge current is set by the

continue for the remaining charge time. In the case when

a time out has occurred, a new battery with the cell voltage

of less than 3.8V can be inserted and charged automati-

cally with the full programmed charge time.

combination of R_SENSEand R_PROG

When the battery approaches the final float voltage, the

charge current will begin to decrease. When the current

drops to 10% of the full-scale charge current, an internal

comparatorwillturnoffthepull-downN-channelMOSFET

at the CHRG pin and connect a weak current source to

ground to indicate an end-of-charge (C/10) condition.

For batteries like lithium-ion that require accurate final

float potential, the internal 2.457V reference, voltage am-

plifierandtheresistordividerprovideregulationwith±1%

(max)accuracy.ForNiMHandNiCdbatteries,theLTC1732

can be turned into a current source by pulling the TIMER

pin to V_CC. When in the constant-current only mode, the

voltage amplifier, timer, C/10 comparator and the trickle

charge function are all disabled.

An external capacitor on the TIMER pin sets the total

charge time. After a time-out occurs, the charge cycle is

terminated and the CHRG pin is forced to a high imped-

ance state. To restart the charge cycle, simply remove the

inputvoltageandreapplyit, orfloatthePROGpinmomen-

tarily.

The charger can be shut down by floating the PROG pin.

An internal current source will pull this pin high and clamp

it at 3.5V.

When the input voltage is not present, the charger goes

into a sleep mode, dropping I_CCto 7µA. This greatly

reduces the current drain on the battery and increases the

standby time.

Replacing the battery while in the charge mode will cause

the timer to be reset if the cell voltage of the new battery

is below 3.8V. If the voltage is above 3.8V, the timer will

W U U

APPLICATIONS INFORMATION

Stop Charging

defective, the charging will be terminated and the CHRG

pin output is forced to a high impedance state.

Thechargerisoffwhenanyofthefollowingconditionsexist:

the voltage at the V_CCpin is below 4.1V, the voltage at the

V_CCpin is higher than 4.1V but is less than 54mV above

V_BAT,orthePROGpinisfloating.TheDRVpinwillbepulled

to V_CCand the internal resistor divider is disconnected to

reduce the current drain on the battery.

Shutdown

The LTC1732 can be forced into shutdown by floating the

PROG pin and allowing the internal 2.5µA current source

to pull the pin above the 2.457V shutdown threshold

voltage. The DRV pin will then be pulled up to V_CCand turn

off the external P-channel MOSFET. The internal timer is

reset in the shutdown mode.

Undervoltage Lockout (UVLO)

Aninternalundervoltagelockoutcircuitmonitorstheinput

voltageandkeepsthechargerinshutdownmodeuntilV_CC

rises above 4.1V. To prevent oscillation around V_CC

4.1V, the UVLO circuit has built-in hysteresis.

Programming Charge Current

The formula for the battery charge current (see Block

Diagram) is:

Trickle Charge and Defective Battery Detection

I_BAT= (I_PROG)(800Ω/R_SENSE

)

At the beginning of the charging sequence, if the battery

voltage is below 2.457V, the charger goes into trickle

mode. The charge current is dropped to 10% of the full-

scale current. If the low cell voltage persists for one

quarterofthetotalchargingtime,thebatteryisconsidered

= (2.457V/R_PROG)(800Ω/R_SENSE

)

where R_PROGis the total resistance from the PROG pin to

ground.

LTC1732-4/LTC1732-4.2

W U U

APPLICATIONS INFORMATION

For example, if 0.5A charge current is needed, select a

value for R_SENSEthat will drop 100mV at the maximum

chargecurrent.R_SENSE=0.1V/0.5A=0.2Ω,thencalculate:

When the LTC1732 is in charge mode, the CHRG pin is

pulled low by an internal N-channel MOSFET. To detect

this mode, force the digital output pin, OUT, high and

measure the voltage at the CHRG pin. The N-channel

MOSFET will pull the pin low even with a 1k pull-up

resistor. Once the charge current drops to 10% of the full-

scale current (C/10), the N-channel MOSFET is turned off

and a 35µA current source is connected to the CHRG pin.

The IN pin will then be pulled high by the 1k pull-up. By

forcing the OUT pin into a high impedance state, the

current source will pull the pin low through the 400k

resistor. When the internal timer has expired, the CHRG

pin will change to high impedance state and the 400k

resistor will then pull the pin high to indicate the charging

has stopped.

R_PROG= (2.457V/500mA)(800Ω/0.2Ω) = 19.656k

For best stability over temperature and time, 1% resistors

are recommended. The closest 1% resistor value is 19.6k.

Programming the Timer

The programmable timer is used to terminate the charg-

ing. The length of the timer is programmed by an external

capacitor at the TIMER pin. The total charge time is:

Time = (3 Hours)(C_TIMER/0.1µF)

The timer starts when an input voltage greater than 4.1V

isappliedandtheprogramresistorisconnectedtoground.

After a time-out occurs, the CHRG output will turn into a

high impedance state to indicate that the charging has

stopped. Connecting the TIMER pin to V_CCdisables the

timer and also puts the charger into a constant-current

mode. To only disable the timer function, short the TIMER

pin to GND.

ACPR Output Pin

The LTC1732 has an ACPR output pin to indicate that the

input supply (wall adapter) is higher than 4.1V and 55mV

abovethevoltageattheBATpin.Whenbothconditionsare

met, the ACPR pin is pulled down to ground by an

N-channel MOSFET that is capable of driving an LED.

Otherwise, this pin is in a high impedance state.

CHRG Status Output Pin

End of Charge (C/10)

Whenthechargecyclestarts, theCHRGpinispulleddown

to ground by an internal N-channel MOSFET that can drive

an LED. When the battery current drops to 10% of the full-

scale current (C/10), the N-channel MOSFET is turned off

and a weak 35µA current source to ground is connected to

the CHRG pin. After a time-out occurs, the pin will go into

a high impedance state. By using two different value pull-

up resistors, a microprocessor can detect three states

from this pin (charging, C/10 and stop charging). See

Figure 1.

TheLTC1732includesacomparatortomonitorthecharge

current to detect an end-of-charge condition. When the

battery current falls below 10% of full scale, the compara-

tor trips and turns off the N-channel MOSFET at the CHRG

pin and switches in a 35µA current source to ground. After

an internal time delay of 15ms, this state is then latched.

This delay will help prevent false triggering due to tran-

sient currents. The end-of-charge comparator is disabled

in trickle charge mode.

Output Voltage Selection

ThefloatvoltageattheBATpincanbeselectedbytheSEL

pin. Shorting the SEL pin to ground will set the float

voltage to 4.1V, while connecting it to V_CCsets it to 4.2V.

This feature allows the charger to be used with different

types of Li-Ion cells. Because the recharge threshold

voltage level of the LTC1732-4.2 is preset for 4.05V, this

version is not recommended for 4.1V cells. When

400k

µPROCESSOR

LTC1732

CHRG

OUT

1732 F01

Figure 1. Microprocessor Interface

LTC1732-4/LTC1732-4.2

W U U

APPLICATIONS INFORMATION

charging 4.1V cells, use the LTC1732-4 with the SEL pin

grounded. The LT1732-4 can also be used for charging

4.2V cells by connecting the SEL pin to V_CC(the recharge

thresholdlevelispresetto3.8V,thusallowingeither4.1V

or 4.2V cells to be charged).

Battery Detection

The LTC1732 can detect the insertion of a new battery.

When a battery with cell voltage of less than 3.8V is

inserted, the LTC1732 resets the timer and starts the

charging cycle immediately. If the cell voltage of the new

battery is above 3.8V, the charging will not start. If a new

battery (with cell voltage above 3.8V) is inserted while in

the charging process, the timer will not be reset. It will

continue until the timer runs out.

Gate Drive

Typically the LTC1732 controls an external P-channel

MOSFET to supply current to the battery. An external PNP

transistor can also be used as the pass transistor instead

of the P-channel MOSFET. Due to the low current gain of

the current amplifier (CA), a high gain Darlington PNP

transistor is required to avoid excessive charge current

error. The gain of the current amplifier is around 0.6µA/

mV. For every 1µA of base current, a 1.6mV of gain error

shows up at the inputs of CA. With R_PROG= 19.6k (100mV

across R_SENSE), it represents 1.67% of error in charging

current.

After a time out has occurred and the battery remains

connected, a new charge cycle will begin if the battery

voltagedropsbelow3.8V(LTC1732-4)or4.05V(LTC1732-

4.2) due to self-discharge or external loading.

Stability

The charger is stable without any compensation when a

P-channel MOSFET is used as the pass transistor.

However, a 10µF capacitor is recommended at the BAT

pin to keep the ripple voltage low when the battery is

disconnected.

Constant-Current Only Mode

The LTC1732 can be used as a programmable current

source by connecting the TIMER pin to V_CC. This is

particularlyusefulforchargingNiMHorNiCdbatteries. In

the constant-current only mode, the timer and voltage

amplifierarebothdisabled.Anexternalterminationmethod

is required to properly terminate the charge.

IfaPNPtransistorisusedforthepasstransistor,a1000pF

capacitor is required from the DRV pin to V_CC. This

capacitor is needed to help stablize the voltage loop. A

10µF capacitor at the BAT pin is also recommended when

a battery is not present.

TYPICAL APPLICATIO S

Linear Charger Using a PNP Transistor

= 6V

MBRM120T3

SENSE

1nF

10k

1µF

0.2Ω

ZTX749

CHRG SENSE

2N5087

DRV

ACPR

LTC1732-4

= 500mA

BAT

TIMER

BAT

PROG

TIMER

0.1µF

SEL

GND

4.1V

Li-Ion

CELL

10µF

PROG

19.6k

1732 TA02

LTC1732-4/LTC1732-4.2

TYPICAL APPLICATIO S

Single Cell 4.1V, 1.5A Li-Ion Battery Charger

MBRS130LT3

0.47µF

22µF

4.7Ω

0.082Ω

1/4W

CHRG SENSE

MBRS130LT3

ACPR

DRV

Si2305DS

TPS2829DBVR

LTC1732-4

TIMER

BAT

15µH

CDRH6D28-150NC

PROG

19.6k

0.1µF

SEL

GND

1-CELL

220µF

Li-Ion

BATTERY

1732 TA03

PACKAGE DESCRIPTIO

Dimensions in inches (millimeters) unless otherwise noted.

MS10 Package

10-Lead Plastic MSOP

(LTC DWG # 05-08-1661)

0.118 ± 0.004*

(3.00 ± 0.102)

10 9

7 6

0.040 ± 0.006

(1.02 ± 0.15)

0.034 ± 0.004

(0.86 ± 0.102)

0.007

(0.18)

0° – 6° TYP

0.118 ± 0.004**

(3.00 ± 0.102)

SEATING

PLANE

0.193 ± 0.006

(4.90 ± 0.15)

0.009

(0.228)

REF

0.021 ± 0.006

(0.53 ± 0.015)

0.006 ± 0.004

(0.15 ± 0.102)

0.0197

(0.50)

BSC

MSOP (MS10) 1098

4 5

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

PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

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Op Amp, Comparator and Reference with 5µA I

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LTC1731

Li-Ion Linear Battery Charger Controller

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

1732i LT/LCG 1000 4K • PRINTED IN THE USA

LINEAR TECHNOLOGY CORPORATION 2000

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

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

LTC1732EMS-4#TR [Linear]

相关型号：

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