LTC1731ES8-8.4#PBF [Linear]

LTC1731-8.X - Lithium-Ion Linear Battery Charger Controller; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C;


型号：	LTC1731ES8-8.4#PBF
厂家：	Linear
描述：	LTC1731-8.X - Lithium-Ion Linear Battery Charger Controller; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C 电池光电二极管
文件：	总12页 (文件大小：168K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LTC1731-4.1/LTC1731-4.2

Single Cell Lithium-Ion Linear

Battery Charger Controllers

FEATURES

DESCRIPTIO

The LTC^®1731 is a complete constant-current/constant-

voltage linear charger controller for single cell lithium-ion

batteries. Nickel-cadmium (NiCd) and nickel-metal-hy-

dride (NiMH) batteries can also be charged with constant

current using external termination. The external sense

resistor sets the charge current with 5% accuracy. An

internal resistor divider and precision reference set the

final float potential with ±1% accuracy. The output float

voltage is set internally to 4.1V (LTC1731-4.1) or 4.2V

(LTC1731-4.2).

■

Complete Linear Charger Controller for

1-Cell Lithium-Ion Batteries

■

1% Voltage Accuracy

■

Programmable Charge Current

■

C/10 Charge Current Detection Output

■

Programmable Charge Termination Timer

■

Space Saving 8-Pin MSOP Package

■

Automatic Sleep Mode When Input Supply

is Removed (7µA Battery Drain)

■

Automatic Trickle Charging of Low Voltage Cells

■

Programmable for Constant-Current-Only Mode

Whentheinputsupplyisremoved,theLTC1731automati-

callyentersalowcurrentsleepmode,droppingthebattery

drain current to typically 7µA. An internal comparator

detects the end-of-charge (C/10) condition while a pro-

grammable timer, using an external capacitor, sets the

total charge time. Fully discharged cells are automatically

trickle charged at 10% of the programmed current until

cell voltage exceeds 2.457V.

APPLICATIO S

■

Cellular Phones

■

Handheld Computers

■

Charging Docks and Cradles

Programmable Current Source

■

The LTC1731 is available in the 8-pin MSOP and SO

packages.

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

TYPICAL APPLICATIO

500mA Li-Ion Battery Charger

= 6V

MBRM120T3

SENSE

1µF

0.2Ω

CHARGE

STATUS

SENSE

DRV

LTC1731-4.2

TIMER

BAT

PROG

GND

Si9430DY

CHRG

= 500mA

BAT

TIMER

0.1µF

Li-ION

CELL

PROG

10µF

19.6k

1731 TA01

*SHUTDOWN INVOKED BY FLOATING THE PROG PIN

LTC1731-4.1/LTC1731-4.2

W W

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ABSOLUTE MAXIMUM RATINGS

(Note 1)

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

Input Voltage (SENSE, DRV, BAT,

TIMER, PROG) .................................. –0.3V to 13.2V

Output Voltage (CHRG) ......................... –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

W U

PACKAGE/ORDER INFORMATION

ORDER PART

TOP VIEW

NUMBER

TOP VIEW

BAT

CHRG

TIMER

GND

SENSE

BAT

CHRG

TIMER

GND

8 SENSE

7 V

6 DRV

LTC1731EMS8-4.1

LTC1731EMS8-4.2

LTC1731ES8-4.1

LTC1731ES8-4.2

DRV

5 PROG

PROG

MS8 PACKAGE

8-LEAD PLASTIC MSOP

MS8 PART MARKING

S8 PART MARKING

S8 PACKAGE

8-LEAD PLASTIC SO

T_JMAX= 150°C, θ_JA= 200°C/W

LTJK

LTKQ

173141

173142

T_JMAX= 150°C, θ_JA= 125°C/W

Consult factory for parts specified with wider operating temperature ranges.

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

LTC1731-4.1 (5V ≤ V ≤ 12V)

●

4.059

4.158

4.1

4.2

4.141

4.242

BAT

LTC1731-4.2 (5V ≤ V ≤ 12V)

Current Mode Charge Current

= 19.6k, R

= 97.6k, R

= 0.2Ω

465

415

500

535

585

130

BAT

PROG

SENSE

●

100

Trickle Charge Current

= 2V, R

= 19.6k, I

= (V – V )/0.2Ω

SENSE

●

100

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

LTC1731-4.1/LTC1731-4.2

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

(V – V ) High to Low

MIN

TYP

MAX

UNITS

Automatic Shutdown Threshold Voltage

100

ASD

BAT

(V – V ) Low to High

BAT

Voltage Mode Disable Threshold Voltage

PROG Pin Current

= V – V

TIMER

●

0.4

µA

DIS

Internal Pull-Up Current, No R

2.5

PROG

PROG Pin Load Regulation

PROG Pin Voltage

PROG Pin Source Current, ∆V

≤ 5mV

300

PROG

=19.6k

= 1V

2.457

100

0.6

PROG

CHRG

CHRG Pin Weak Pull-Down Current

CHRG Pin Output Low Voltage

End of Charge Indication Current Level

TIMER Accuracy

150

1.2

µA

CHRG

= 5mA

CHRG

= 19.6k, R

= 0.2Ω

SENSE

●

100

C/10

PROG

TIMER

CLAMP

= 0.1µF

= V – V , I = 50µA

DRV DRIVE

TIMER

DRV Pin Clamp Voltage

6.5

CLAMP

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

of a device may be impaired.

Note 2: The LTC1731E 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. Guaranteed I grade parts are available,

consult factory.

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Program Pin Voltage

vs Temperature

Trickle Charge Current

vs Input Supply

Timer Accuracy vs Temperature

2.470

2.465

2.460

2.455

2.450

110

105

100

= 19.6k

= 6V

PROG

= 6V

PROG

TIMER

= 0.2Ω

= 19.6k

= 0.1µF

SENSE

= 2V

BAT

= 25°C

50 75

100 125 150

–50 –25

100 125 150

–50 –25

(V)

TEMPERATURE (°C)

1731 G01

1731 G02

1731 G03

LTC1731-4.1/LTC1731-4.2

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TYPICAL PERFOR A CE CHARACTERISTICS

Trickle Charge Threshold Voltage

vs Temperature

Trickle Charge Current

vs Temperature

Timer Accuracy vs Input Supply

2.470

2.465

2.460

2.455

2.450

110

105

100

= 6V

= 3V

= 19.6k

BAT

TIMER

PROG

= 0.1µF

= 0.2Ω

SENSE

= 25°C

= 2V

BAT

= 6V

50 75

100 125 150

–50 –25

100 125 150

–50 –25

TEMPERATURE (°C)

(V)

TEMPERATURE (°C)

1731 G04

1731 G05

1731 G06

Battery Charge Current

vs Temperature

Trickle Charge Threshold Voltage

vs Input Supply

2.480

2.475

540

530

= 19.6k

PROG

= 25°C

= 0.2Ω

SENSE

= 3V

BAT

= 6V

2.470

2.465

520

510

2.460

2.455

500

490

2.450

2.445

2.440

480

470

460

50 75

–50 –25

100 125 150

(V)

TEMPERATURE (°C)

1731 G08

1731 G07

Program Pin Voltage

vs Input Supply

Battery Charge Current

vs Input Supply

2.480

2.475

520

515

= 19.6k

PROG

= 3V

= 0.2Ω

BAT

SENSE

= 25°C

= 3V

BAT

= 25°C

2.470

2.465

510

505

2.460

2.455

500

495

2.450

2.445

2.440

490

485

480

(V)

1731 G09

1731 G10

LTC1731-4.1/LTC1731-4.2

PIN FUNCTIONS

GND (Pin 4): Ground Connection.

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

least 10µF is required to keep the loop stable when the

battery is not connected. A precision internal resistor

dividersetsthefinalfloatpotentialonthispin. Theresistor

divider is disconnected in sleep mode.

PROG (Pin 5): 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. An internal 2.5µA

current source will pull the pin above the shutdown

threshold voltage when the program resistor (R_PROG) is

disconnected.

CHRG (Pin 2): 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

drops to 10% of the full-scale current for at least 0.32

seconds, the N-channel MOSFET turns off and a 100µA

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.

DRV (Pin 6): Drive Output Pin for the P-Channel MOSFET

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

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

The DRV pin is internally clamped to 6.5V below V_CC.

V_CC(Pin 7): Positive Input Supply Voltage. When V_BATis

within 54mV of V_CC, the LTC1731 is forced into sleep

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

Bypass this pin with a 1µF capacitor.

TIMER (Pin 3): Timer Capacitor and Constant-Voltage

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 constant-voltage mode and the

timer are disabled, the chip will operate in constant-

currentmodeonly. ShorttheTIMERpintoGNDtodisable

the internal timer function and the C/10 function.

SENSE (Pin 8): 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

)

LTC1731-4.1/LTC1731-4.2

BLOCK DIAGRA

SENSE

–

800Ω

80Ω

–

54mV

CHRG

–

C/10 STOP C/10

720Ω

DRV

BAT

100µA

LOGIC

–

SHDN

SLP

LBO

TIMER

OSCILLATOR

COUNTER

REF

–

2.5µA

REF

2.457V

CHARGE

PROG

GND

1731 BD

BATTERY CURRENT I

= (2.457V • 800Ω)/(R

• R

)

SENSE

BAT

PROG

LTC1731-4.1/LTC1731-4.2

OPERATIO

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.

The LTC1731 is a linear battery charger controller for

single cell lithium-ion batteries. The charge current is

programmed by the combination of a program resistor

(R_PROG)fromthePROGpintogroundandasenseresistor

(R_SENSE) between the V_CCand SENSE pins. R_PROGsets a

program current through an internal trimmed 800Ω resis-

tor setting up a voltage drop from V_CCto the input of the

current amplifier (CA). The current amplifier servos the

gate of the external P-channel MOSFET to force the same

voltagedropacrossR_SENSEwhichsetsthechargecurrent.

When the potential at the BAT pin approaches the preset

float voltage, the voltage amplifier (VA) will start sinking

An external capacitor on the TIMER pin sets the total

charge time. After a time-out occurs, the charging will be

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

ancestate.Torestartthechargecycle,simplyremovethe

input voltage and reapply it, or float the PROG pin

momentarily.

current which shrinks the voltage drop across R_SENSE

thus reducing the charge current.

For batteries like lithium-ion that require accurate final

float potential, the internal 2.457V reference, voltage

amplifier and the resistor divider provide regulation with

±1% (max) accuracy. For NiMH and NiCd batteries, the

LTC1731 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 and the trickle charge

function are all disabled.

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 be terminated.

The charger can be shut down by floating the PROG pin

(I_CC= 1mA). An internal current source will pull it high and

clamp 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.

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

combination of R_SENSEand R_PROG

W U U

APPLICATIONS INFORMATION

Charge Termination

Trickle Charge and Defective Battery Detection

The charger is off when any of the following conditions

exist: 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, or the PROG pin is floating. The DRV pin will

be pulled to V_CCand the internal resistor divider is discon-

nected to reduce the current drain on the battery.

At the beginning of the charging sequence, if the battery

voltage is low (below 2.457V) the charger goes into trickle

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

scale current. If the low cell voltage persists for one

quarterofthetotalchargingtime,thebatteryisconsidered

defective, charging will be terminated and the CHRG pin

output is forced to a high impedance state.

Undervoltage Lockout (UVLO)

Shutdown

Aninternalundervoltagelockoutcircuitmonitorstheinput

voltageandkeepsthechargerinshutdownmodeuntilV_CC

rises above 4.1V. To prevent oscillation around

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

TheLTC1731canbeforcedintoshutdownbyfloatingthe

PROG pin and allowing the internal 2.5µA current source

to pull the pin above the 2.457V shutdown threshold

LTC1731-4.1/LTC1731-4.2

W U U

APPLICATIONS INFORMATION

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.

LTC1731

CHRG

µPROCESSOR

100k

OUT

Programming Charge Current

The formula for the battery charge current (see Block

Diagram) is:

1731 F01

Figure 1. Microprocessor Interface

I_BAT= (I_PROG)(800Ω/R_SENSE

)

= (2.457V/R_PROG)(800Ω/R_SENSE

)

pull-upresistors,amicroprocessorcandetectthreestates

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

Figure 1.

where R_PROGis the total resistance from the PROG pin to

ground.

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 LTC1731 is in charge mode, the CHRG pin is

pulled down 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 2k pull-up resis-

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

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

100µA current source is connected to the CHRG pin. The

IN pin will then be pulled high by the 2k pull-up. By forcing

the OUT pin into a high impedance state, the current

source will pull the pin low through the 100k resistor.

When the internal timer has expired, the CHRG pin will

change to high impedance state and the 100k resistor will

thenpullthepinhightoindicatethecharginghasstopped.

Refer to Table 1 for the summary.

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 charge.

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 the 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.

Table 1. CHRG Pin Interface with Microprocessor

OUT

High

Hi-Z

High

Hi-Z

STATUS

Charging

C/10

Low

High

Low

High

C/10

Stop Charging

CHRG Status Output Pin

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 100µA 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

End of Charge (C/10)

TheLTC1731includesacomparatortomonitorthecharge

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 100µA current source to ground.

LTC1731-4.1/LTC1731-4.2

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APPLICATIONS INFORMATION

Constant-Current Only Mode

After an internal time delay of 320ms, this state is then

latched. This delay will help prevent false triggering due to

transient currents. The end-of-charge comparator is dis-

abled in trickle charge mode.

The LTC1731 can be used as a programmable current

sourcebyforcingtheTIMERpintoV_CC. Thisisparticularly

useful for charging NiMH or NiCd batteries. In the con-

stant-current only mode, the timer and voltage amplifier

are both disabled. An external termination method is

required to properly terminate the charge.

Gate Drive

Typically the LTC1731 controls an external P-channel

MOSFET to supply current to the battery. The DRV pin is

internally clamped to 6.5V below V_CC. This feature allows

low voltage P-channel MOSFETs with gate to source

breakdown voltage rated at 8V to be used.

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.

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

When a PNP transistor is chosen as the pass transistor, a

1000pFcapacitorisrequiredfromtheDRVpintoV_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.

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.

TYPICAL APPLICATIO

Using CHRG Pin to Indicate Charge Status

= 6V

OPTIONAL: FOR REVERSE

INPUT PROTECTION

MMSD4148

MBRM120T3

1.5k

MMBT3906

20k

SENSE

1µF

4.7k

0.2Ω

MMBT3906

SENSE

2.2k

CHRG

LTC1731-4.2

TIMER

BAT

PROG

GND

DRV

Si9430DY

CONDITION

GREEN AMBER

NO WALL ADAPTER

CHARGING (I > C/10)

CHARGING (I < C/10)

TIMER EXPIRED

OFF

GREEN

AMBER

0.1µF

Li-ION

CELL

PROG

19.6k

10µF

1731 TA04

LTC1731-4.1/LTC1731-4.2

PACKAGE DESCRIPTIO

Dimensions in inches (millimeters) unless otherwise noted.

MS8 Package

8-Lead Plastic MSOP

(LTC DWG # 05-08-1660)

0.118 ± 0.004*

(3.00 ± 0.102)

0.118 ± 0.004**

(3.00 ± 0.102)

0.193 ± 0.006

(4.90 ± 0.15)

0.043

(1.10)

MAX

0.034

(0.86)

REF

0.007

(0.18)

0° – 6° TYP

SEATING

PLANE

0.009 – 0.015

(0.22 – 0.38)

0.021 ± 0.006

(0.53 ± 0.015)

0.005 ± 0.002

(0.13 ± 0.05)

0.0256

(0.65)

BSC

MSOP (MS8) 1100

* 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

LTC1731-4.1/LTC1731-4.2

PACKAGE DESCRIPTIO

Dimensions in inches (millimeters) unless otherwise noted.

S8 Package

8-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.189 – 0.197*

(4.801 – 5.004)

0.150 – 0.157**

(3.810 – 3.988)

0.228 – 0.244

(5.791 – 6.197)

0.010 – 0.020

(0.254 – 0.508)

× 45°

0.053 – 0.069

(1.346 – 1.752)

0.004 – 0.010

(0.101 – 0.254)

0.008 – 0.010

(0.203 – 0.254)

0°– 8° TYP

0.016 – 0.050

(0.406 – 1.270)

0.050

(1.270)

BSC

0.014 – 0.019

(0.355 – 0.483)

TYP

*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD

FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

SO8 1298

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.

LTC1731-4.1/LTC1731-4.2

TYPICAL APPLICATIO S

Linear Charger Using a PNP Transistor

1.5A Single Cell Switching Battery Charger

5V TO 6V

= 6V

MBRM120T3

MBRS130LT3

1µF

CER

22µF

CER

1nF

10k

SENSE

0.2Ω

0.47µF

1µF

0.082Ω

1/4W

4.7Ω

SENSE

DRV

LTC1731-4.2

TIMER

BAT

PROG

GND

ZTX749

SENSE

2N5087

MBRS130LT3

Si2305DS

CHRG

DRV

= 500mA

BAT

LTC1731-4.2

LTC1693-5

22µH

CDRH6D38-220NC

TIMER

C1*

0.1µF

TIMER

0.1µF

10µF

BAT

GND PROG

Li-ION

CELL

PROG

Li-ION

BATTERY

19.6k

18.2k

100µF

1731 TA02

1731 TA03

*AVX 0603ZC104KAT1A

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

LT^®1510-5

500kHz Constant-Voltage/Constant-Current

Battery Charger

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

V Can Be Higher or Lower Than Battery Voltage, 1.5A Switch

LT1512

SEPIC Battery Charger

LT1571-1/LT1571-2 200kHz/500kHz Constant-Current/Constant-Voltage

Up to 1.5A Charge Current for 1- or 2-Cell Li-Ion Batteries, Preset and

Adjustable Battery Voltages, C/10 Charge Detection

LT1571-5

Battery Charger Family

LT1620/LT1621

LTC1730

Rail-to-Rail Current Sense Amplifier

Integrated Pulse Charger for 1-Cell Li-Ion Battery

Termination Controller for Li-Ion

Precise Output Current Programming, Up to 32V V

OUT

0.35Ω Internal N-FET Requires No Blocking Diode

LTC1729

Time or Charge Current Termination, Automatic Charger/Battery

Detection, Status Output, Preconditioning, 8-Lead MSOP

LTC1732

LTC1734

Constant-Current/Constant-Voltage Li-Ion Linear

Battery Charger

Stand Alone Battery, No µC or Firmware Required, Auto Recharge of

Low Battery, 10-Pin MSOP, Input Supply Detection

SOT-23 Li-Ion Battery Charger

Needs Only Two External Components, Monitors Charge Current, No

Reverse Diode or Sense Resistor Required

1731f LT/TP 0301 4K • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

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

LINEAR TECHNOLOGY CORPORATION 1999

LTC1731ES8-8.4#PBF [Linear]

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