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Linear Technology Electronic Components Datasheet

LT1505 Datasheet

Constant-Current/Voltage High Efficiency Battery Charger

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LT1505
Constant-Current/Voltage
High Efficiency Battery Charger
FEATURES
s Simple Charging of Li-Ion, NiMH and NiCd Batteries
s Very High Efficiency: Up to 97%
s Precision 0.5% Charging Voltage Accuracy
s Preset Battery Voltages: 12.3V, 12.6V,
16.4V and 16.8V
s 5% Charging Current Accuracy
s Charging Current Programmed by Resistor or DAC
s 0.5V Dropout Voltage, Duty Cycle > 99.5%
s AC Adapter Current Limit* Maximizes Charging Rate
s Flag Indicates Li-Ion Charge Completion
s Auto Shutdown with Adapter Removal
s Only 10µA Battery Drain When Idle
s Synchronizable Up to 280kHz
U
APPLICATIO S
s Notebook Computers
s Portable Instruments
s Chargers for Li-Ion, NiMH, NiCd and Lead Acid
Rechargeable Batteries
DESCRIPTIO
The LT®1505 PWM battery charger controller fast charges
multiple battery chemistries including lithium-ion (Li-Ion),
nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd)
using constant-current or constant-voltage control. Maxi-
mum current can be easily programmed by resistors or a
DAC. The constant-voltage output can be selected for 3 or 4
series Li-Ion cells with 0.5% accuracy.
A third control loop limits the current drawn from the AC
adapter during charging*. This allows simultaneous opera-
tion of the equipment and fast battery charging without over-
loading the AC adapter.
The LT1505 can charge batteries ranging from 2.5V to 20V
with dropout voltage as low as 0.5V. Synchronous
N-channel FETs switching at 200kHz give high efficiency
and allow small inductor size. A diode is not required in
series with the battery because the charger automatically
enters a 10µA sleep mode when the wall adapter is un-
plugged. A logic output indicates Li-Ion full charge when
current drops to 20% of the programmed value.
The LT1505 is available in a 28-pin SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*US Patent No. 5,723,970
TYPICAL APPLICATION
VIN
(FROM
ADAPTER)
R5
4k
R6
4k
M3
Si4435
DBODY*
TO
SYSTEM POWER
RS4
0.025
R7
500
C1
1µF
CIN
47µF
35V
100k
VCC
CLN
CLP
INFET
UV
SYNC
SHDN
BOOST BOOSTC
GBIAS
TGATE
SW
BGATE
LT1505
VC
PROG
3 CELL
*BODY DIODE
POLARITY MUST
BE AS SHOWN
C6
0.1µF
R1
1k
C7
0.68µF
FLAG
CAP
COMP1
BAT2 BAT
VFB
4.2V
4.1V
AGND
PGND
SENSE SPIN
C4
0.1µF
D3
MMSD4148T1
C3 D2
2.2µF MMSD4148T1
5
M1
Si4412
M2
Si4412
D4
MBRS140
C2
0.68µF
L1
15µH
RS1
0.025
COUT
22µF
25V
×2
300
CPROG
1µF
RPROG
4.93k
1%
RX4
3k
0.33µF
NOTE: DBODY IS THE BODY DIODE OF M3
CIN: SANYO OS-CON
L1: SUMIDA CDRH127-150
(CAN BE FROM 10µH TO 30µH)
RS2
200
1%
RS3
200
1%
VBAT
12.6V
BATTERY
1505 F01
Figure 1. Low Dropout 4A Lithium-Ion Battery Charger
1


Linear Technology Electronic Components Datasheet

LT1505 Datasheet

Constant-Current/Voltage High Efficiency Battery Charger

No Preview Available !

LT1505
ABSOLUTE MAXIMUM RATINGS (Note 1)
VCC, CLP, CLN, INFET, UV, 3CELL, FLAG................ 27V
SW Voltage with Respect to GND ........................... – 2V
BOOST, BOOSTC Voltage with Respect to VCC ....... 10V
GBIAS ..................................................................... 10V
SYNC, BAT2, BAT, SENSE, SPIN ............................ 20V
VC, PROG, VFB, 4.1V, 4.2V ........................................ 7V
CAP, SHDN .......................................................... ±3mA
TGATE, BGATE Current Continuous ....................... 0.2A
TGATE, BGATE Output Energy (per cycle) ............... 2µJ
Maximum Operating VCC ......................................... 24V
Operating Ambient Temperature Range ....... 0°C to 70°C
Operating Junction Temperature Range .... 0°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
BOOST 1
TGATE 2
SW 3
SYNC 4
SHDN 5
AGND 6
UV 7
INFET 8
CLP 9
CLN 10
COMP1 11
CAP 12
FLAG 13
4.1V 14
28 PGND
27 BGATE
26 GBIAS
25 BOOSTC
24 VCC
23 BAT
22 SPIN
21 SENSE
20 BAT2
19 PROG
18 VC
17 VFB
16 3CELL
15 4.2V
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 100°C/ W
ORDER PART
NUMBER
LT1505CG
Consult factory for Industrial and Military grade parts.
TOP VIEW
BOOST 1
TGATE 2
SW 3
SYNC 4
SHDN 5
AGND 6
UV 7
INFET 8
NC 9
NC 10
GND 11
CAP 12
FLAG 13
4.1V 14
28 PGND
27 BGATE
26 GBIAS
25 BOOSTC
24 VCC
23 BAT
22 SPIN
21 SENSE
20 BAT2
19 PROG
18 VC
17 VFB
16 3CELL
15 4.2V
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 100°C/ W
ORDER PART
NUMBER
LT1505CG-1
NOTE: LT1505CG-1 DOES NOT
HAVE INPUT CURRENT
LIMITING FUNCTION.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 18V, VBAT = 12.6V, VCLN = VCC (LT1505), no load on any
outputs unless otherwise noted.
PARAMETER
Overall
CONDITIONS
MIN TYP MAX
Supply Current
Sense Amplifier CA1 Gain and Input Offset Voltage
(With RS2 = 200, RS3 = 200)
(Measured across RS1, Figure 1) (Note 2)
BOOST Pin Current
VCC 24V
11V VCC 24V , 0V VBAT 20V
RPROG = 4.93k
RPROG = 4.93k
RPROG = 49.3k
VBOOST = VSW + 8V, 0V VSW 20V
TGATE High
TGATE Low
q 12 15
95 100 105
q 92
108
7 10 13
23
23
BOOSTC Pin Current
Reference
Reference Voltage (Note 3)
Reference Voltage Tolerance
VBOOSTC = VCC + 8V
RPROG = 4.93k, Measured at VFB with VA
Supplying IPROG and Switching Off
11V VCC 24V
1
2.453 2.465 2.477
q 2.441
2.489
UNITS
mA
mV
mV
mV
mA
mA
mA
V
V
2


Part Number LT1505
Description Constant-Current/Voltage High Efficiency Battery Charger
Maker Linear Technology
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LT1505 Datasheet PDF






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