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Linear Technology Electronic Components Datasheet

LT1510-5 Datasheet

Constant-Voltage/ Constant-Current Battery Charger

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LT1510/LT1510-5
Constant-Voltage/
Constant-Current Battery Charger
FEATURES
s Charges NiCd, NiMH and Lithium-Ion Batteries ––
Only One 1/10W Resistor Is Needed to Program
Charging Current
s High Efficiency Current Mode PWM with 1.5A
Internal Switch and Sense Resistor
s 3% Typical Charging Current Accuracy
s Precision 0.5% Voltage Reference for Voltage
Mode Charging or Overvoltage Protection
s Current Sensing Can Be at Either Terminal of
the Battery
s Low Reverse Battery Drain Current: 3µA
s Charging Current Soft Start
s Shutdown Control
s 500kHz Version Uses Small Inductor
U
APPLICATIONS
s Chargers for NiCd, NiMH and Lithium Batteries
s Step-Down Switching Regulator with Precision
Adjustable Current Limit
DESCRIPTION
With switching frequency as high as 500kHz, The LT®1510
current mode PWM battery charger is the smallest, sim-
plest, most efficient solution to fast-charge modern re-
chargeable batteries including lithium-ion (Li-Ion), nickel-
metal-hydride (NiMH)* and nickel-cadmium (NiCd)* that
require constant-current and/or constant-voltage charg-
ing. The internal switch is capable of delivering 1.5A DC
current (2A peak current). The 0.1onboard current
sense resistor makes the charging current programming
very simple. One resistor (or a programming current from
a DAC) is required to set the full charging current (1.5A) to
within 5% accuracy. The LT1510 with 0.5% reference
voltage accuracy meets the critical constant-voltage charg-
ing requirement for lithium cells.
The LT1510 can charge batteries ranging from 2V to 20V.
Ground sensing of current is not required and the battery’s
negative terminal can be tied directly to ground. A saturat-
ing switch running at 200kHz (500kHz for LT1510-5) gives
high charging efficiency and small inductor size. A block-
ing diode is not required between the chip and the battery
because the chip goes into sleep mode and drains only 3µA
when the wall adaptor is unplugged. Soft start and shutdown
features are also provided. The LT1510 is available in a 16-pin
fused lead power SO package with a thermal resistance of
50°C/W, an 8-pin SO and a 16-pin PDIP.
, LTC and LT are registered trademarks of Linear Technology Corporation.
* NiCd and NiMH batteries require charge termination circuitry (not shown in Figure 1).
TYPICAL APPLICATIONS
C1 D1
0.22µF MBRM120T3
SW
VCC +
D3
MBRM120T3
CIN*
10µF
8.2V TO 20V
–+
L1**
10µH
D2
MMBD914L
BOOST PROG
LT1510-5
GND VC
OVP
1µF
300
0.1µF
1k
6.19k
SENSE
BAT
+
+
COUT***
22µF
4.2V
NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED
* TOKIN OR MARCON CERAMIC SURFACE MOUNT
** COILTRONICS TP3-100, 10µH, 2.2mm HEIGHT (0.8A CHARGING CURRENT)
COILTRONICS TP1 SERIES, 10µH, 1.8mm HEIGHT (<0.5A CHARGING CURRENT)
*** PANASONIC EEFCD1B220
† OPTIONAL, SEE APPLICATIONS INFORMATION
Q3
2N7002
R3
70.6k
0.25%
R4
100k
0.25%
1510 F01
Figure 1. 500kHz Smallest Li-Ion Cell Phone Charger (0.8A)
C1 D1
0.22µF 1N5819
SW
VCC +
CIN*
10µF
D3
1N5819
11V TO 28V
–+
L1**
33µH
D2
1N914
BOOST PROG
LT1510
GND VC
OVP
1µF
300
0.1µF
1k
3.83k
SENSE
BAT
+
+
COUT
4.2V
22µF
TANT +
4.2V
NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED
* TOKIN OR MARCON CERAMIC SURFACE MOUNT
** COILTRONICS CTX33-2
OPTIONAL, SEE APPLICATIONS INFORMATION
Q3
VN2222
R3
240k
0.25%
R4
100k
0.25%
1510 F02
Figure 2. Charging Lithium Batteries (Efficiency at 1.3A > 87%)
1


Linear Technology Electronic Components Datasheet

LT1510-5 Datasheet

Constant-Voltage/ Constant-Current Battery Charger

No Preview Available !

LT1510/LT1510-5
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VMAX) ............................................ 30V
Switch Voltage with Respect to GND ...................... – 3V
Boost Pin Voltage with Respect to VCC ................... 30V
Boost Pin Voltage with Respect to GND ................. – 5V
VC, PROG, OVP Pin Voltage ...................................... 8V
IBAT (Average) ........................................................ 1.5A
Switch Current (Peak)............................................... 2A
Storage Temperature Range ................. – 65°C to 150°C
Operating Ambient Temperature Range
Commercial ............................................. 0°C to 70°C
Extended Commercial (Note 7) ........... – 40°C to 85°C
Industrial (Note 8) .............................. – 40°C to 85°C
Operating Junction Temperature Range
LT1510C (Note 7) ............................. – 40°C to 125°C
LT1510I ............................................ – 40°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
SW 1
BOOST 2
GND 3
SENSE 4
TOP VIEW
8 VCC
7 PROG
6 VC
5 BAT
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 125°C/ W
ORDER PART
NUMBER
LT1510CS8
LT1510IS8
S8 PART MARKING
1510
1510I
TOP VIEW
**GND 1
SW 2
BOOST 3
GND 4
OVP 5
NC 6
SENSE 7
**GND 8
16 GND**
15 VCC2
14 VCC1
13 PROG
12 VC
11 NC
10 BAT
9 GND**
GN PACKAGE (0.015 IN)
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 75°C/ W
** FOUR CORNER PINS ARE FUSED TO
INTERNAL DIE ATTACH PADDLE FOR
HEAT SINKING. CONNECT THESE FOUR
PINS TO EXPANDED PC LANDS FOR
PROPER HEAT SINKING.
ORDER PART
NUMBER
LT1510CGN
LT1510IGN
LT1510-5CGN
LT1510-5IGN
**GND 1
SW 2
BOOST 3
GND 4
OVP 5
SENSE 6
GND 7
**GND 8
TOP VIEW
16 GND**
15 VCC2
14 VCC1
13 PROG
12 VC
11 BAT
10 GND
9 GND**
ORDER PART
NUMBER
LT1510CN
LT1510CS
LT1510IN
LT1510IS
GN PART
MARKING
1510
1510I
15105
15105I
N PACKAGE
16-LEAD PDIP
S PACKAGE*
16-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 75°C/ W (N)
TJMAX = 125°C, θJA = 50°C/ W (S)*
* VCC1 AND VCC2 SHOULD BE CONNECTED
TOGETHER CLOSE TO THE PINS.
** FOUR CORNER PINS ARE FUSED TO
INTERNAL DIE ATTACH PADDLE FOR
HEAT SINKING. CONNECT THESE FOUR
PINS TO EXPANDED PC LANDS FOR
PROPER HEAT SINKING.
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
VCC = 16V, VBAT = 8V, VMAX (maximum operating VCC) = 28V, no load on any outputs, unless otherwise noted. (Notes 7, 8)
PARAMETER
CONDITIONS
MIN TYP MAX
Overall
Supply Current
DC Battery Current, IBAT (Note 1)
VPROG = 2.7V, VCC 20V
VPROG = 2.7V, 20V < VCC VMAX
8V VCC 25V, 0V VBAT 20V, TJ < 0°C
RPROG = 4.93k
RPROG = 3.28k (Note 4)
RPROG = 49.3k
TJ < 0°C
VCC = 28V, VBAT = 20V
RPROG = 4.93k
RPROG = 49.3k
q 2.90 4.3
q 2.91 4.5
q 0.91
1.09
q 0.93 1.0 1.07
q 1.35 1.5 1.65
q 75 100 125
q 70
130
q 0.93 1.0 1.07
q 75 100 125
UNITS
mA
mA
A
A
A
mA
mA
A
mA
2


Part Number LT1510-5
Description Constant-Voltage/ Constant-Current Battery Charger
Maker Linear Technology
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