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LT1511

Description
Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting
File Size151KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LT1511 Overview

Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting

FEATURES
s
LT1511
Constant-Current/
Constant-Voltage 3A Battery
Charger with Input Current Limiting
DESCRIPTIO
The LT
®
1511 current mode PWM battery charger is the
simplest, most efficient solution to fast charge modern
rechargeable 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 3A* DC
current (4A peak current). Full-charging current can be
programmed by resistors or a DAC to within 5%. With 0.5%
reference voltage accuracy, the LT1511 meets the critical
constant-voltage charging requirement for Li-Ion cells.
A third control loop is provided to regulate the current
drawn from the AC adapter. This allows simultaneous
operation of the equipment and battery charging without
overloading the adapter. Charging current is reduced to
keep the adapter current within specified levels.
The LT1511 can charge batteries ranging from 1V 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 gives high charging effi-
ciency and small inductor size. A blocking diode is not
required between the chip and the battery because the
chip goes into sleep mode and drains only 3µA when the
wall adapter is unplugged.
R7
500Ω
GND
SW
BOOST
LT1511
COMP1
200pF
SPIN
OVP SENSE
CLP
CLN
V
CC
C1
1µF
D3
MBRD340
R
S4
ADAPTER
CURRENT SENSE
s
s
s
s
s
s
s
s
s
s
Simple Design to Charge NiCd, NiMH and Lithium
Rechargeable Batteries—Charging Current
Programmed by Resistors or DAC
Adapter Current Loop Allows Maximum Possible
Charging Current During Computer Use
Precision 0.5% Accuracy for Voltage Mode Charging
High Efficiency Current Mode PWM with 4A Internal
Switch
5% Charging Current Accuracy
Adjustable Undervoltage Lockout
Automatic Shutdown When AC Adapter is Removed
Low Reverse Battery Drain Current: 3µA
Current Sensing Can Be at Either Terminal of the Battery
Charging Current Soft-Start
Shutdown Control
APPLICATIO S
s
s
Chargers for NiCd, NiMH, Lead-Acid, Lithium
Rechargeable Batteries
Switching Regulators with Precision Current Limit
, LTC and LT are registered trademarks of Linear Technology Corporation.
*See LT1510 for 1.5A Charger
TYPICAL APPLICATIO
D1
MBRD340
L1**
20µH
C2
0.47µF
+
10µF
+
C
IN
*
10µF
D2
MBR0540T
UV
PROG
V
C
BAT
R
S2
200Ω
1%
1k
0.33µF
300Ω
C
PROG
1µF
R
PROG
4.93k
1%
NOTE: COMPLETE LITHIUM-ION CHARGER,
NO TERMINATION REQUIRED. R
S4
, R7
AND C1 ARE OPTIONAL FOR I
IN
LIMITING
*TOKIN OR UNITED CHEMI-CON/MARCON
CERAMIC SURFACE MOUNT
**20µH COILTRONICS CTX20-4
SEE APPLICATIONS INFORMATION FOR
INPUT CURRENT LIMIT AND UNDERVOLTAGE LOCKOUT
R
S3
200Ω
1%
R
S1
0.033Ω
BATTERY CURRENT
SENSE
R3
390k
0.25%
BATTERY
VOLTAGE SENSE
R4
162k
0.25%
+
C
OUT
22µF
TANT
50pF
Figure 1. 3A Lithium-Ion Battery Charger
U
U
U
V
IN
(ADAPTER INPUT)
11V TO 28V
TO MAIN
SYSTEM POWER
R5
UNDERVOLTAGE
LOCKOUT
R6
5k
+
4.2V
+
4.2V
V
BAT
2 Li-Ion
1511 • F01
1

LT1511 Related Products

LT1511 LT1511ISW LT1511CSW
Description Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting
Brand Name - Linear Technology Linear Technology
Is it Rohs certified? - incompatible incompatible
Maker - Linear ( ADI ) Linear ( ADI )
Parts packaging code - SOIC SOIC
package instruction - SOP, SOP24,.4 SOP, SOP24,.4
Contacts - 24 24
Manufacturer packaging code - SW SW
Reach Compliance Code - _compli _compli
ECCN code - EAR99 EAR99
Analog Integrated Circuits - Other Types - BATTERY CHARGE CONTROLLER BATTERY CHARGE CONTROLLER
control mode - CURRENT-MODE CURRENT-MODE
Control Technology - PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage - 28 V 28 V
Minimum input voltage - 11 V 11 V
Nominal input voltage - 16 V 16 V
JESD-30 code - R-PDSO-G24 R-PDSO-G24
JESD-609 code - e0 e0
length - 15.395 mm 15.395 mm
Humidity sensitivity level - 1 1
Number of functions - 1 1
Number of terminals - 24 24
Maximum operating temperature - 85 °C 70 °C
Maximum output current - 4 A 4 A
Nominal output voltage - 2.465 V 2.465 V
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - SOP SOP
Encapsulate equivalent code - SOP24,.4 SOP24,.4
Package shape - RECTANGULAR RECTANGULAR
Package form - SMALL OUTLINE SMALL OUTLINE
Peak Reflow Temperature (Celsius) - 235 235
power supply - 16 V 16 V
Certification status - Not Qualified Not Qualified
Maximum seat height - 2.642 mm 2.642 mm
Maximum supply current (Isup) - 7 mA 7 mA
Nominal supply voltage (Vsup) - 16 V 16 V
surface mount - YES YES
Switch configuration - SINGLE SINGLE
Maximum switching frequency - 230 kHz 230 kHz
technology - BIPOLAR BIPOLAR
Temperature level - INDUSTRIAL COMMERCIAL
Terminal surface - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form - GULL WING GULL WING
Terminal pitch - 1.27 mm 1.27 mm
Terminal location - DUAL DUAL
Maximum time at peak reflow temperature - 20 20
width - 7.493 mm 7.493 mm
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