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LT1511ISW#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT1511
Constant-Current/
Constant-Voltage 3A Battery
Charger with Input Current Limiting
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.
Figure 1. 3A Lithium-Ion Battery Charger
SW
BOOST
COMP1
CLN
UV
OVP SENSE BAT
C1
1µF
R
S4
†
ADAPTER
CURRENT SENSE
R7
†
500Ω
R5
†
UNDERVOLTAGE
LOCKOUT
R6
5k
V
IN
(ADAPTER INPUT)
11V TO 28V
V
BAT
10µF
C
PROG
1µF
C
IN
*
10µF
300Ω
R
PROG
4.93k
1%
0.33µF
1k
C2
0.47µF
R
S3
200Ω
1%
R
S2
200Ω
1%
L1**
20µH
D2
MBR0540T
200pF
R
S1
0.033Ω
BATTERY CURRENT
SENSE
R3
390k
0.25%
BATTERY
VOLTAGE SENSE
R4
162k
0.25%
50pF
C
OUT
22µF
TANT
4.2V
4.2V
+
+
LT1511
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
V
CC
TO MAIN
SYSTEM POWER
SPIN
D1
MBRD340
GND
CLP
2 Li-Ion
D3
MBRD340
1511 • F01
PROG
V
C
+ +
+
, LTC and LT are registered trademarks of Linear Technology Corporation.
*See LT1510 for 1.5A Charger
■
Chargers for NiCd, NiMH, Lead-Acid, Lithium
Rechargeable Batteries
■
Switching Regulators with Precision Current Limit
■
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
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LT1511
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
UU
ORDER PART
NUMBER
LT1511CSW
LT1511ISW
T
JMAX
= 125°C, θ
JA
= 30°C/W**
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
SW PACKAGE
24-LEAD PLASTIC SO WIDE
24
23
22
21
20
19
18
17
16
15
14
13
GND**
SW
BOOST
GND**
GND**
UV
GND**
OVP
CLP
CLN
COMP1
SENSE
GND**
GND**
V
CC1
*
V
CC2
*
V
CC3
*
PROG
V
C
UV
OUT
GND**
COMP2
BAT
SPIN
Consult factory for Military grade parts.
*ALL V
CC
PINS SHOULD
BE CONNECTED
TOGETHER CLOSE TO
THE PINS
** ALL GND PINS ARE
FUSED TO INTERNAL DIE
ATTACH PADDLE FOR
HEAT SINKING. CONNECT
THESE PINS TO
EXPANDED PC LANDS
FOR PROPER HEAT
SINKING. 30°C/W
THERMAL RESISTANCE
ASSUMES AN INTERNAL
GROUND PLANE
DOUBLING AS A HEAT
SPREADER
(Note 1)
Supply Voltage
(V
MAX
, CLP and CLN Pin Voltage) ...................... 30V
Switch Voltage with Respect to GND ...................... –3V
Boost Pin Voltage with Respect to V
CC
................... 25V
Boost Pin Voltage with Respect to GND ................. 57V
Boost Pin Voltage with Respect to SW Pin .............. 30V
V
C
, PROG, OVP Pin Voltage...................................... 8V
I
BAT
(Average)........................................................... 3A
Switch Current (Peak) .............................................. 4A
Operating Junction Temperature Range
Commercial ...........................................0°C to 125°C
Industrial ......................................... –40°C to 125°C
Operating Ambient Temperature
Commercial ............................................ 0°C to 70°C
Industrial ........................................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 16V, V
BAT
= 8V, V
MAX
(maximum operating V
CC
) = 28V,
R
S2
= R
S3
= 200Ω (see Block Diagram), V
CLN
= V
CC
. No load on any outputs unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Overall
Supply Current V
PROG
= 2.7V, V
CC
≤ 20V ● 4.5 6.8 mA
V
PROG
= 2.7V, 20V < V
CC
≤ 25V ● 4.6 7.0 mA
Sense Amplifier CA1 Gain and Input Offset Voltage 8V ≤ V
CC
≤ 25V , 0V ≤ V
BAT
≤ 20V
(With R
S2
= 200Ω, R
S3
= 200Ω)R
PROG
= 4.93k ● 95 100 105 mV
(Measured across R
S1
)(Note 2) R
PROG
= 49.3k ● 81012 mV
T
J
< 0°C 7 13 mV
V
CC
= 28V, V
BAT
= 20V
R
PROG
= 4.93k ● 90 110 mV
R
PROG
= 49.3k ● 713mV
T
J
< 0°C 6 14 mV
V
CC
Undervoltage Lockout (Switch OFF) Threshold Measured at UV Pin ● 678 V
UV Pin Input Current 0.2V ≤ V
UV
≤ 8V ● 0.1 5 µA
UV Output Voltage at UV
OUT
Pin In Undervoltage State, I
UVOUT
= 70µA ● 0.1 0.5 V
UV Output Leakage Current at UV
OUT
Pin 8V ≤ V
UV
, V
UVOUT
= 5V ● 0.1 3 µA
Reverse Current from Battery (When V
CC
Is V
BAT
≤ 20V, V
UV
≤ 0.4V 3 15 µA
Not Connected, V
SW
Is Floating)
3
LT1511
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 16V, V
BAT
= 8V, V
MAX
(maximum operating V
CC
) = 28V,
R
S2
= R
S3
= 200Ω (see Block Diagram), V
CLN
= V
CC
. No load on any outputs unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Overall
Boost Pin Current V
CC
= 20V, V
BOOST
= 0V 0.1 10 µA
V
CC
= 28V, V
BOOST
= 0V 0.25 20 µA
2V ≤ V
BOOST
– V
CC
< 8V (Switch ON) 6 9 mA
8V ≤ V
BOOST
– V
CC
≤ 25V (Switch ON) 8 12 mA
Switch
Switch ON Resistance 8V ≤ V
CC
≤ V
MAX
, I
SW
= 3A,
V
BOOST
– V
SW
≥ 2V ● 0.15 0.25 Ω
∆I
BOOST
/∆I
SW
During Switch ON V
BOOST
= 24V, I
SW
≤ 3A 25 35 mA/A
Switch OFF Leakage Current V
SW
= 0V, V
CC
≤ 20V ● 2 100 µA
20V < V
CC
≤ 28V ● 4 200 µA
Minimum I
PROG
for Switch ON ● 2420 µA
Minimum I
PROG
for Switch OFF at V
PROG
≤ 1V ● 1 2.4 mA
Maximum V
BAT
for Switch ON ● V
CC
– 2 V
Current Sense Amplifier CA1 Inputs (Sense, BAT)
Input Bias Current ● –50 –125 µA
Input Common Mode Low ● –0.25 V
Input Common Mode High ● V
CC
– 2 V
SPIN Input Current –100 –200 µA
Reference
Reference Voltage (Note 3) R
PROG
= 4.93k, Measured at OVP with
VA Supplying I
PROG
and Switch OFF 2.453 2.465 2.477 V
Reference Voltage All Conditions of V
CC
,T
J
> 0°C ● 2.441 2.489 V
T
J
< 0°C (Note 4) ● 2.43 2.489 V
Oscillator
Switching Frequency 180 200 220 kHz
Switching Frequency All Conditions of V
CC
,T
J
> 0°C ● 170 200 230 kHz
T
J
< 0°C ● 160 230 kHz
Maximum Duty Cycle
● 85 %
T
A
= 25°C9093%
Current Amplifier CA2
Transconductance V
C
= 1V, I
VC
= ±1µA 150 250 550 µmho
Maximum V
C
for Switch OFF ● 0.6 V
I
VC
Current (Out of Pin) V
C
≥ 0.6V 100 µA
V
C
< 0.45V 3 mA
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LT1511ISW#PBF

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Buy LT1511ISW#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management 3A Step-Down Battery Charger
Lifecycle:
New from this manufacturer.
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