LTC1731EMS8-8.4#PBF [Linear]
LTC1731-8.X - Lithium-Ion Linear Battery Charger Controller; Package: MSOP; Pins: 8; Temperature Range: -40°C to 85°C;
| 型号： | LTC1731EMS8-8.4#PBF |
| 厂家： | 
Linear |
| 描述： | LTC1731-8.X - Lithium-Ion Linear Battery Charger Controller; Package: MSOP; 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：169K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1731-8.2/LTC1731-8.4
Lithium-Ion Linear
Battery Charger Controller
U
FEATURES
DESCRIPTIO
The LTC®1731-8.2/LTC1731-8.4 are complete constant-
current/constant-voltagelinearchargercontrollersfor2-
celllithium-ion(Li-Ion)batteries.Nickel-cadmium(NiCd)
and nickel-metal-hydride (NiMH) batteries can also be
charged with constant current using external termina-
tion. The external sense resistor sets the charge current
with 7% accuracy. An internal resistor divider and preci-
sion reference set the final float potential with 1% accu-
racy. The output float voltages are set internally to 8.2V
(LTC1731-8.2) or 8.4V (LTC1731-8.4).
■
Complete Linear Charger Controller for
2-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 (15µA Battery Drain)
■
Automatic Trickle Charging of Low Voltage Cells
■
Programmable for Constant-Current-Only Mode
When the input supply is removed, the LTC1731-8.2/
LTC1731-8.4automaticallyenteralowcurrentsleepmode,
dropping the battery drain current to typically 15µA. An
internalcomparatordetectstheend-of-charge(C/10)con-
dition while a programmable timer, using an external
capacitor, setsthetotalchargetime. Fullydischargedcells
are automatically trickle charged at 10% of the pro-
grammed current until battery voltage exceeds 4.95V.
U
APPLICATIO S
■
Cellular Phones
■
Handheld Computers
■
Charging Docks and Cradles
Programmable Current Source
■
The LTC1731-8.2/LTC1731-8.4 are available in the 8-pin
MSOP and SO packages. For 1-cell Li-Ion battery charg-
ing, see the LTC1731-4.1 and LTC1731-4.2 data sheets.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
400mA Li-Ion Charger
Typical Li-Ion Charge Cycle
V
= 9V
IN
9
CONSTANT
CURRENT
CONSTANT
VOLTAGE
MBRM120T3
7
BATTERY VOLTAGE
R
2k
SENSE
V
1µF
CC
400
300
200
100
0
8
7
6
0.2Ω
8
6
400mA HR BATTERY
CHARGE
STATUS
SENSE
DRV
LTC1731-8.4
TIMER
BAT
PROG
GND
2
3
Q1
Si9430DY
CHRG
CHARGE CURRENT
I
= 400mA
BAT
1
5
CHRG
LED OFF
TIMER
STOPS
C
TIMER
0.1µF
+
R
*
2-CELL
Li-ION
PROG
10µF
4
19.6k
2.0
TIME (HOURS)
3.0
0
0.5
1.0
1.5
2.5
1731 TA01
1731 TA01b
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
sn1731 17318fs
1
LTC1731-8.2/LTC1731-8.4
W W U W
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VCC) ................................... 13.2V
SENSE, DRV, BAT, TIMER, PROG ............ –0.3V to VCC
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
U
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PACKAGE/ORDER INFORMATION
ORDER PART
ORDER PART
TOP VIEW
NUMBER
NUMBER
TOP VIEW
BAT
CHRG
TIMER
GND
1
2
3
4
8
7
6
5
SENSE
BAT
CHRG
TIMER
GND
1
2
3
4
8 SENSE
7 V
6 DRV
LTC1731EMS8-8.2
LTC1731EMS8-8.4
LTC1731ES8-8.2
LTC1731ES8-8.4
V
CC
CC
DRV
5 PROG
PROG
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PART MARKING
S8 PART MARKING
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 200°C/W
LTSW
LTPE
173182
173184
TJMAX = 150°C, θJA = 125°C/W
Consult LTC Marketing 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 TA = 25°C. VCC = 9V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Supply Voltage
Input Supply Current
●
8.8
12
V
CC
I
Charger On, Current Mode
Shutdown Mode
Sleep Mode (Battery Drain Current)
●
●
1
1
15
3
2
30
mA
mA
µA
CC
V
Regulated Output Voltage
LTC1731-8.2 (9V ≤ V ≤ 12V)
●
●
8.118
8.316
8.2
8.4
8.282
8.484
V
V
BAT
CC
LTC1731-8.4 (9V ≤ V ≤ 12V)
CC
I
Current Mode Charge Current
R
PROG
R
PROG
R
PROG
= 19.6k, R
= 19.6k, R
= 97.6k, R
= 0.2Ω
= 0.2Ω
= 0.2Ω
465
415
70
500
500
100
535
585
130
mA
mA
mA
BAT
SENSE
SENSE
SENSE
●
I
Trickle Charge Current
V
= 4V, R
= 19.6k, I
= (V – V )/0.2Ω
SENSE
●
●
●
30
50
4.95
8.2
100
5.1
8.8
mA
V
TRIKL
BAT
PROG
TRIKL
CC
V
V
Trickle Charge Threshold Voltage
BAT Rising
4.7
TRIKL
UV
V
V
Undervoltage Lockout Voltage
Undervoltage Lockout Hysteresis
V
V
Rising
Falling
V
CC
CC
CC
CC
∆V
200
mV
UV
V
Manual Shutdown Threshold Voltage
PROG Pin Rising
PROG Pin Falling
2.457
2.446
V
V
MSD
I
Drive Pin Current
V
= V – 2V
26
µA
DRV
DRV
CC
sn1731 17318fs
2
LTC1731-8.2/LTC1731-8.4
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 9V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
(V – V ) Falling
MIN
TYP
MAX
UNITS
V
Automatic Shutdown Threshold Voltage
30
40
54
69
90
100
mV
mV
ASD
CC
BAT
(V – V ) Rising
CC
BAT
V
Voltage Mode Disable Threshold Voltage
PROG Pin Current
V
= (V – V )
TIMER
●
●
0.4
V
µA
µA
V
DIS
DIS
CC
I
Internal Pull-Up Current, No R
2.5
PROG
PROG
PROG Pin Load Regulation
PROG Pin Voltage
PROG Pin Source Current, ∆V
≤ 5mV
300
50
PROG
V
R
=19.6k
= 1V
2.457
100
0.6
50
PROG
PROG
CHRG
CHRG
I
CHRG Pin Weak Pull-Down Current
CHRG Pin Output Low Voltage
End of Charge Indication Current Level
TIMER Accuracy
V
150
1.2
µA
V
CHRG
V
I
= 5mA
CHRG
I
t
R
= 19.6k, R
= 0.2Ω
SENSE
●
25
100
mA
%
C/10
PROG
TIMER
CLAMP
C
V
= 0.01µF
= V – V , I = 50µA
DRV DRIVE
10
TIMER
V
DRV Pin Clamp Voltage
6.5
V
CLAMP
CC
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1731E-8.2/LTC1731E-8.4 are 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. Consult
factory for I grade parts.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Trickle Charge Current
vs Temperature
Trickle Charge Threshold Voltage
vs VCC
Trickle Charge Current
vs VCC
60
55
50
45
40
60
55
50
45
40
4.96
4.95
4.94
4.93
4.92
4.91
4.90
4.89
4.88
R
R
V
= 19.6K
R
R
V
= 19.6K
R
A
= 19.6K
PROG
PROG
PROG
= 0.2Ω
= 0.2Ω
T
= 25°
SENSE
SENSE
= 4V
= 4V
BAT
BAT
V
= 9V
T
= 25°
CC
A
9
10
11
12
–25
0
25
50
75
125
9
10
11
12
–50
100
V
CC
(V)
V
(V)
CC
TEMPERATURE (°C)
1731 G01
1731 G08
1731 G06
sn1731 17318fs
3
LTC1731-8.2/LTC1731-8.4
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TYPICAL PERFOR A CE CHARACTERISTICS
Trickle Charge Threshold Voltage
vs Temperature
Timer Accuracy vs VCC
Timer Accuracy vs Temperature
4.94
4.93
4.92
4.91
4.90
110
105
100
95
110
105
100
95
V
= 9V
C
V
A
= 0.1µF
CC
C
V
= 0.1µF
TIMER
BAT
TIMER
CC
= 6V
= 9V
T
= 25°
90
–50
90
–25
0
25
50
75
125
–50
100
9
10
11
12
–25
0
25
50
75
125
100
V
(V)
TEMPERATURE (°C)
TEMPERATURE (°C)
CC
1731 G03
1731 G05
1731 G04
Battery Charge Current
vs VCC
Program Pin Voltage
vs VCC
Battery Charge Current
vs Temperature
520
510
500
490
480
2.48
2.47
2.46
2.45
2.44
540
530
520
510
500
490
480
470
460
R
R
V
= 19.6K
R
V
= 19.6K
PROG
R
R
V
= 19.6K
PROG
PROG
= 0.2Ω
= 6V
BAT
= 0.2Ω
SENSE
SENSE
= 6V
T = 25°
A
= 6V
BAT
BAT
T
= 25°
V
= 9V
A
CC
9
10
11
12
9
10
11
12
–25
0
25
50
75
125
–50
100
V
CC
(V)
V
(V)
CC
TEMPERATURE (°C)
1731 G09
1731 G10
1731 G07
Program Pin Voltage
vs Temperature
2.470
2.465
2.460
2.455
2.450
R
CC
= 19.6k
PROG
V
= 9V
–25
0
25
50
75
125
–50
100
TEMPERATURE (°C)
1731 G02
sn1731 17318fs
4
LTC1731-8.2/LTC1731-8.4
U
U
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PIN FUNCTIONS
GND (Pin 4): Ground.
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 resistive
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, RPROG to ground. The charge current is IBAT
= (VPROG • 800Ω)/(RPROG • RSENSE). 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.
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. If a PNP transistor is used, it must have
highgain(seeApplicationsInformationsection). TheDRV
pin is internally clamped to 6.5V below VCC.
VCC (Pin 7): Input Supply Voltage. VCC ranges from 8.8V
to 12V when charging. If VCC drops below VBAT + 54mV,
for example when the input supply is disconnected, then
the IC enters sleep mode with ICC < 30µA. Bypass this pin
with a 1µF capacitor.
TIMER (Pin 3): Timer Capacitor and Constant-Voltage
Mode Disable Input Pin. A capacitor CTIMER connected
from this pin to ground sets a 30 hour/µF time period for
charge termination. When the TIMER pin is connected to
VCC, the constant-voltage mode and the timer is disabled
and the IC will operate in constant-current mode only.
Short the TIMER pin to GND to disable the internal timer
and the C/10 functions.
SENSE (Pin 8): Current Sense Input. Connect this pin to
the sense resistor. Choose the resistor value using the
following equation:
RSENSE = (VPROG • 800Ω)/(RPROG • IBAT
)
sn1731 17318fs
5
LTC1731-8.2/LTC1731-8.4
W
BLOCK DIAGRA
V
CC
7
R
SENSE
SENSE
+
–
8
800Ω
C1
80Ω
+
54mV
–
CHRG
2
+
–
C4
–
+
C/10 STOP C/10
720Ω
DRV
BAT
100µA
CA
6
1
LOGIC
–
+
SHDN
SLP
C2
LBO
TIMER
OSCILLATOR
COUNTER
3
4.9V
V
REF
–
+
+
–
+
–
VA
V
CC
V
REF
C3
A1
2.457V
2.5µA
CHARGE
PROG
GND
5
4
1731 BD
BATTERY CURRENT I
= (2.457V • 800Ω)/(R
• R
SENSE
)
BAT
PROG
R
PROG
sn1731 17318fs
6
LTC1731-8.2/LTC1731-8.4
U
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
comparator will turn off the N-channel MOSFET at the
CHRG pin and connect a weak current source to ground to
indicate a near end-of-charge (C/10) condition.
The LTC1731-8.2/LTC1731-8.4 are linear battery charger
controllers. The charge current is programmed by the
combination of a program resistor (RPROG) from the
PROG pin to ground and a sense resistor (RSENSE) be-
tween the VCC and SENSE pins. RPROG sets a program
current through an internal trimmed 800Ω resistor that
creates a voltage drop from VCC to the input of the current
amplifier (CA). The current amplifier servos the gate of the
external P-channel MOSFET to force the same voltage
drop across RSENSE which sets the charge current. When
the potential at the BAT pin approaches the preset float
voltage, the voltage amplifier (VA) will start sinking cur-
rent which shrinks the voltage drop across RSENSE, thus
reducing the charge current.
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.
Forbatterieslikelithium-ionthatrequireanaccuratefinal
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
LTC1731-8.2/LTC1731-8.4 can be turned into a current
source by pulling the TIMER pin to VCC. 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 VCC pin 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 4.95V, 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.
The charger can be shut down by floating the PROG pin
(ICC ≈ 1mA). An internal current source will pull it high and
clamp at 3.5V.
The charger goes into the fast charge constant-current
mode after the voltage on the BAT pin rises above 4.95V.
In constant-current mode, the charge current is set by the
When the input voltage is not present, the charger goes
into a sleep mode, dropping ICC to 15µA. This greatly
reduces the current drain on the battery and increases the
standby time.
combination of RSENSE and RPROG
.
sn1731 17318fs
7
LTC1731-8.2/LTC1731-8.4
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APPLICATIONS INFORMATION
Charger Conditions
For best stability over temperature and time, 1% resistors
are recommended. The closest 1% resistor value is 19.6k.
The charger is off when any of the following conditions
exist:the VCC pinislessthan8.2V, thedroputvoltage(VCC
- VBAT) is less than 54mV, the PROG pin is floating, or the
timer has ended. The DRV pin will be pulled to VCC and the
internal resistor divider is disconnected to reduce the
current drain on the battery.
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 (Hours) = (3 Hours)(CTIMER/0.1µF)
Undervoltage Lockout (UVLO)
The timer starts when the input voltage greater than 8.2V
isappliedandtheprogramresistorisconnectedtoground.
Afteratime-outoccurs,theCHRGoutputwillbecomehigh
impedance indicating that the charge cycle has ended.
Connecting the TIMER pin to VCC disables the timer and
also puts the charger into a constant-current mode. To
only disable the timer function, short the TIMER pin to
GND.
Aninternalundervoltagelockoutcircuitmonitorstheinput
voltageandkeepsthechargerinshutdownmodeuntilVCC
rises above 8.2V. To prevent oscillation around
VCC = 8.2V, the UVLO circuit has built-in hysteresis.
Trickle Charge and Defective Battery Detection
At the beginning of the charging sequence, if the battery
voltage is less than 4.95V the charger goes into trickle
charge mode. The charge current is reduced to 10% of the
full-scale current. If the low battery voltage persists for
one quarter of the total charging time, the battery is
considered defective, charging will be terminated and the
CHRG pin output is forced to a high impedance state.
CHRG Status Output Pin
When the charge cycle starts, the CHRG pin is pulled to
groundbyaninternalN-channelMOSFETthatcandrivean
LED. When the charge current drops to 10% of the full-
scale current (C/10), the N-channel MOSFET turns off and
aweak100µAcurrentsourcetogroundisconnectedtothe
CHRG pin. After a time-out occurs, the CHRG pin goes
highimpedanceindicatingthatthechargecyclehasended.
By using two different value pull-up resistors, a micropro-
cessor can detect three states from this pin (charging,
C/10 and stop charging). See Figure 1.
Shutdown
The LTC1731-8.2/LTC1731-8.4 can be forced into shut-
down 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 is then pulled
uptoVCC turningofftheexternalP-channelMOSFET.The
internal timer is reset in the shutdown mode.
+
V
DD
V
7
Programming Charge Current
V
CC
µPROCESSOR
100k
2k
LTC1731-8.4
CHRG
The formula for the battery charge current (see Block
Diagram) is:
2
OUT
IN
IBAT = (2.457V/RPROG)(800Ω/RSENSE
)
1731 F01
where RPROG is the total resistance from the PROG pin to
ground.
Figure 1. Microprocessor Interface
For example, if 0.5A charge current is needed, select a
value for RSENSE that will drop 100mV at the maximum
chargecurrent.RSENSE =0.1V/0.5A=0.2Ω,thencalculate:
RPROG = (2.457V/500mA)(800Ω/0.2Ω) = 19.656k
sn1731 17318fs
8
LTC1731-8.2/LTC1731-8.4
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APPLICATIONS INFORMATION
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
charging current error. The gain of the current amplifier is
around 0.6µA/mV. For every 1µA of base current, a 1.6mV
When the LTC1731 is in the charge mode, the CHRG pin
is pulled to ground 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
resistor. 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.
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 and the 100k resistor
will then pull the pin high to indicate the charge cycle has
ended.
gain error shows up at the inputs of CA. With RPROG
=
19.6k and 100mV across RSENSE, this gain error causes a
1.67% error in charge current.
Constant-Current Only Mode
The LTC1731-8.2/LTC1731-8.4 can be used as a pro-
grammable current source by forcing the TIMER pin to
VCC. This is particularly useful for charging NiMH or NiCd
batteries.Intheconstant-currentonlymode,thetimerand
voltage amplifier are both disabled. An external termina-
tion method is required to properly terminate the charge.
End of Charge (C/10)
The LTC1731-8.2/LTC1731-8.4 include a comparator to
monitor the charge current to detect a near end-of-charge
condition. This comparator does not terminate the charge
cycle, but provides and output signal to indicate a near full
charge condition. The timer is used to terminate the
charge cycle. When the battery current falls below 10% of
fullscale, thecomparatortripsandturnsofftheN-channel
MOSFET at the CHRG pin and switches in a 100µA current
source to ground. 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 disabled in trickle charge mode.
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. A ceramic output capacitor may also be
used, but because of the very low ESR and high Q
characteristics of multilayer ceramic capacitors, it may
be necessary to add a 1Ω resistor in series with the
ceramic capacitor to improve voltage mode stability.
When a PNP transistor is chosen as the pass transistor, a
1000pFcapacitorisrequiredfromtheDRVpintoVCC.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.
Gate Drive
Typically the LTC1731-8.2/LTC1731-8.4 drive an external
P-channel MOSFET to supply current to the battery. The
DRV pin is internally clamped to 6.5V below VCC. This
feature allows low voltage P-channel MOSFETs with gate
to source breakdown voltage rated at 8V to be used.
sn1731 17318fs
9
LTC1731-8.2/LTC1731-8.4
U
PACKAGE DESCRIPTION
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.889 ± 0.127
(.035 ± .005)
5.23
(.206)
MIN
3.2 – 3.45
(.126 – .136)
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.52
(.206)
REF
0.65
(.0256)
BSC
0.42 ± 0.04
(.0165 ± .0015)
8
7 6
5
TYP
RECOMMENDED SOLDER PAD LAYOUT
3.00 ± 0.102
(.118 ± .004)
NOTE 4
4.88 ± 0.1
(.192 ± .004)
DETAIL “A”
0.254
(.010)
0° – 6° TYP
GAUGE PLANE
1
2
3
4
0.53 ± 0.015
(.021 ± .006)
1.10
(.043)
MAX
0.86
(.34)
REF
DETAIL “A”
0.18
(.077)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
0.13 ± 0.05
(.005 ± .002)
0.65
(.0256)
BCS
MSOP (MS8) 1001
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
sn1731 17318fs
10
LTC1731-8.2/LTC1731-8.4
U
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
7
5
8
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
SO8 1298
1
3
4
2
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
sn1731 17318fs
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.
11
LTC1731-8.2/LTC1731-8.4
U
TYPICAL APPLICATIO
Linear Charger Using a PNP Transistor
V
= 9V
IN
MBRM120T3
R2
2k
C1
1nF
R1
10k
R
SENSE
0.25Ω
C3
1µF
7
CHARGE
STATUS
V
CC
Q2
ZTX749
8
6
SENSE
DRV
LTC1731-8.4
TIMER
BAT
PROG
GND
2
Q1
2N5087
CHRG
I
= 400mA
BAT
3
1
5
C
*
TIMER
0.1µF
+
C2
10µF
R
2-CELL
Li-ION
PROG
4
19.6k
1731 TA02
*AVX 0603ZC104KAT1A
RELATED PARTS
PART NUMBER
LT®1510-5
DESCRIPTION
COMMENTS
Most Compact, Up to 1.5A, Charges NiCd, NiMH, Li-Ion Cells
V Can Be Higher or Lower Than Battery Voltage, 1.5A Switch
IN
500kHz Constant-Voltage/Constant-Current Battery Charger
SEPIC Battery Charger
LT1512
LT1571-1/-2/-5
200kHz/500kHz 1.5A Constant-Current/Constant-Voltage
Battery Charger
Charges 1- or 2-Cell Li-Ion Batteries, Preset and Adjustable
Battery Voltages, C/10 Charge Detection
LTC1615
LT1620
SOT-23 Step-Up Switching Regulator
Rail-to-Rail Current Sense Amplifier
Low Noise Doubler Charge Pump
Termination Controller for Li-Ion
1.2V ≤ V ≤ 15V; Up to 34 Output; I = 20µA
IN Q
Precise Output Current Programming, Up to 32V V
OUT
LTC1682
LTC1729
Output Noise = 60µV
; 2.5V to 5.5V Output
RMS
Time or Charge Current Termination, Automatic Charger/Battery
Detection, Status Output, Preconditioning, 8-Lead MSOP
LTC1730
Complete Li-Ion Pulse Battery Charger with Internal FET
and Thermal Regulation
Efficient 1.5A Charger with Many Features Including
Overcurrent Battery Protection
LTC1731-4.1/-4.2 Complete Li-Ion Linear Battery Charger Controller
Single Cell Li-Ion; C/10 Detection; Complete Charger
LTC1732
Complete Li-Ion Linear Battery Charger Controller
No Firmware Required; AC Adapter Indicator
Automatic Charge and Recharge
LTC1733
Complete Li-Ion Linear Battery Charger with Internal FET
1.5A Charger with Many Features Including Thermal Feedback for
Increased Charge Current without Exceeding Maximum
Temperature
LTC1734
ThinSOT Li-Ion Charger
Only Two External Components; V
No Diode Needed, No Sense Resistor Needed
Tracks I
PROG CHARGE
LTC1754
LTC4050
ThinSOT Charge Pump
I
OUT
= 50mA; 2V ≤ V ≤ 4.4V; for Backlight White LED
IN
Complete Li-Ion Charger with Thermistor Interface
No Firmware required, AC Adapter Indicator
Automatic Charge and Recharge
sn1731 17318fs
LT/TP 0602 2K • PRINTED IN USA
12 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
© LINEAR TECHNOLOGY CORPORATION 2000
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