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Battery Charger. LTC4007-1 Datasheet

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Battery Charger. LTC4007-1 Datasheet






LTC4007-1 Charger. Datasheet pdf. Equivalent




LTC4007-1 Charger. Datasheet pdf. Equivalent





Part

LTC4007-1

Description

Li-Ion Battery Charger



Feature


LTC4007-1 4A, High Efficiency, Li-Ion Ba ttery Charger Features Description n Charger Controller for 3- or 4-Cell Li thium-Ion Batteries n High Conversion E fficiency: Up to 96% n Output Currents Exceeding 4A n ±0.8% Charging Voltage Accuracy n Built-In Charge Termination for Li-Ion Batteries n AC Adapter Curre nt Limiting Maximizes Charge Rate* n Th ermistor Input for .
Manufacture

Linear Technology

Datasheet
Download LTC4007-1 Datasheet


Linear Technology LTC4007-1

LTC4007-1; Temperature Qualified Charging n Wide In put Voltage Range: 6V to 28V n 0.5V Dro pout Voltage; Maximum Duty Cycle: 98% n Programmable Charge Current: ±4% Accu racy n Indicator Outputs for Charging, C/10 Current Detection, AC Adapter Pres ent, Low Battery, Input Current Limitin g and Faults n Charging Current Monitor Output n Available in a 24-Pin 4mm × 5mm QFN Package Appl.


Linear Technology LTC4007-1

ications n Notebook Computers n Portable Instruments n Battery-Backup Systems n Li-Ion Chargers The LTC®4007-1 is a constant-current/constant-voltage charg er controller for 3- or 4-cell lithium- ion batteries. The PWM controller uses a synchronous, quasi-constant frequency , constant off-time architecture that w ill not generate audible noise even whe n using ceramic cap.


Linear Technology LTC4007-1

acitors. Charging current is programmabl e to ±4% accuracy using a programming resistor. Charging current can also be monitored as a voltage across the progr amming resistor. The output float volta ge is pin programmed for cell count (3 cells or 4 cells) and chemistry (4.2V/4 .1V). A timer, programmed by an externa l resistor, sets the total charge time. The LTC4007-1 incl.

Part

LTC4007-1

Description

Li-Ion Battery Charger



Feature


LTC4007-1 4A, High Efficiency, Li-Ion Ba ttery Charger Features Description n Charger Controller for 3- or 4-Cell Li thium-Ion Batteries n High Conversion E fficiency: Up to 96% n Output Currents Exceeding 4A n ±0.8% Charging Voltage Accuracy n Built-In Charge Termination for Li-Ion Batteries n AC Adapter Curre nt Limiting Maximizes Charge Rate* n Th ermistor Input for .
Manufacture

Linear Technology

Datasheet
Download LTC4007-1 Datasheet




 LTC4007-1
LTC4007-1
4A, High Efficiency,
Li-Ion Battery Charger
Features
Description
n Charger Controller for 3- or 4-Cell
Lithium-Ion Batteries
n High Conversion Efficiency: Up to 96%
n Output Currents Exceeding 4A
n ±0.8% Charging Voltage Accuracy
n Built-In Charge Termination for Li-Ion Batteries
n AC Adapter Current Limiting Maximizes Charge Rate*
n Thermistor Input for Temperature Qualified Charging
n Wide Input Voltage Range: 6V to 28V
n 0.5V Dropout Voltage; Maximum Duty Cycle: 98%
n Programmable Charge Current: ±4% Accuracy
n Indicator Outputs for Charging, C/10 Current
Detection, AC Adapter Present, Low Battery, Input
Current Limiting and Faults
n Charging Current Monitor Output
n Available in a 24-Pin 4mm × 5mm QFN Package
Applications
n Notebook Computers
n Portable Instruments
n Battery-Backup Systems
n Li-Ion Chargers
The LTC®4007-1 is a constant-current/constant-voltage
charger controller for 3- or 4-cell lithium-ion batteries.
The PWM controller uses a synchronous, quasi-constant
frequency, constant off-time architecture that will not
generate audible noise even when using ceramic capaci-
tors. Charging current is programmable to ±4% accuracy
using a programming resistor. Charging current can also be
monitored as a voltage across the programming resistor.
The output float voltage is pin programmed for cell count
(3 cells or 4 cells) and chemistry (4.2V/4.1V). A timer, pro-
grammed by an external resistor, sets the total charge time.
The LTC4007-1 includes a thermistor input, which
suspends charging if an unsafe temperature condition
is detected. If the cell voltage is less than 3.25V, a low-
battery indicator asserts and can be used to program a
trickle charge current to safely charge depleted batteries.
The FAULT pin is also asserted and charging terminates
if the low-battery condition persists for more than 1/4 of
the total charge time.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Protected by U.S. Patents including 5723970.
Typical Application
DCIN
0V TO 28V
VLOGIC
LOBAT
ICL
ACP
SHDN
FAULT
CHG
FLAG
100k
THERMISTOR
10k
NTC
100k
100k
32.4k
0.47µF
3C4C
DCIN
CHEM
INFET
LOBAT
CLP
ICL LTC4007-1 CLN
ACP
TGATE
SHDN
BGATE
FAULT
PGND
CHG
CSP
FLAG
BAT
NTC
PROG
RT
ITH
GND
309k
TIMING RESISTOR
(~2 HOURS)
12.6V, 4A Li-Ion Battery Charger
INPUT SWITCH
0.1µF
4.99k
15nF 0.025Ω
20µF
Q1
10µH
SYSTEM
LOAD
0.025Ω
Q2
3.01k
3.01k
6.04k
0.0047µF
0.12µF
26.7k
Q1: Si4431BDY
Q2: FDC645N
20µF
CHARGING
CURRENT
MONITOR
40071 TA01
For more information www.linear.com/LTC4007-1
PART
LTC4007-1
LTC4007
AUTO
RESTART
NO
YES
LOW BATTERY
THRESHOLD (Per Cell)
(4.2V/4.1V)
3.25V/3.173V
2.5V/2.44V
Li-Ion
BATTERY
40071fa
1




 LTC4007-1
LTC4007-1
Absolute Maximum Ratings
(Note 1)
Voltage from DCIN, CLP, CLN to GND.......... +32V/–0.3V
PGND with Respect to GND................................... ±0.3V
CSP, BAT to GND.......................................... +28V/–0.3V
CHEM, 3C4C, RT to GND................................. +7V/–0.3V
NTC............................................................... +10V/–0.3V
ACP, SHDN, CHG, FLAG,
FAULT, LOBAT, ICL......................................... +32V/–0.3V
CLP to CLN.............................................................±0.5V
Operating Ambient Temperature Range
(Note 4) .............................................. –40°C to 85°C
Operating Junction Temperature............ –40°C to 125°C
Storage Temperature Range................... –65°C to 125°C
Pin Configuration
TOP VIEW
ACP 1
RT 2
FAULT 3
GND 4
3C4C 5
LOBAT 6
NTC 7
24 23 22 21 20
19 NC
18 PGND
17 TGATE
25
16 CLN
15 CLP
14 FLAG
13 CHEM
8 9 10 11 12
UFD PACKAGE
24-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 90°C/W
EXPOSED PAD (PIN 25), GND AND PGND SHOULD BE CONNECTED
TOGETHER WITH A LOW OHMIC CONNECTION
Order Information http://www.linear.com/product/LTC4007-1#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4007EUFD-1#PBF
LTC4007EUFD-1#TRPBF 40071
24-Lead Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VDCIN = 20V, VBAT = 12V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
DCIN Operating Range
6
28
IQ
Operating Current
VTOL Charge Voltage Accuracy
Sum of Current from CLP, CLN, DCIN
3
5
Nominal Values: 12.3V, 12.6V, 16.4V,
–0.8
0.8
16.8V (Note 2)
l –1.0
1.0
ITOL
Charge Current Accuracy (Note 3)
VCSP – VBAT Target = 100mV
–4
4
l –5
5
VBAT < 6V, VCSP – VBAT Target = 10mV
±60
6V ≤ VBAT ≤ VLOBAT , VCSP – VBAT
±35
Target = 10mV
TSAMPLE Measured Sample Time
RRT = 1190k
l 42
60
Shutdown
Battery Leakage Current
DCIN = 0V
SHDN = 3V
l
20
35
l –10
10
UVLO Undervoltage Lockout Threshold
DCIN Rising, VBAT = 0
l 4.2
4.7
5.5
Shutdown Threshold at SHDN
l
1
1.6
2.5
UNITS
V
mA
%
%
%
%
%
%
ms
µA
µA
V
V
40071fa
2
For more information www.linear.com/LTC4007-1




 LTC4007-1
LTC4007-1
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VDCIN = 20V, VBAT = 12V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
SHDN Pin Current
–10
Operating Current in Shutdown
VSHDN = 0V, Sum of Current from CLP,
CLN, DCIN
2
3
Current Sense Amplifier, CA1
Input Bias Current Into BAT Pin
11.67
CMSL CA1/I1 Input Common Mode Low
l
0
CMSH CA1/I1 Input Common Mode High
Current Comparators ICMP and IREV
ITMAX Maximum Current Sense Threshold (VCSP – VBAT) VITH = 2.5V
ITREV Reverse Current Threshold (VCSP – VBAT)
l
l 140
VCLN – 0.2
165
200
–30
Current Sense Amplifier, CA2
Transconductance
1
Source Current
Measured at ITH, VITH = 1.4V
–40
Sink Current
Measured at ITH, VITH = 1.4V
40
Current Limit Amplifier
Transconductance
1.4
VCLP Current Limit Threshold
l 93
100
107
ICLP
CLP Input Bias Current
100
Voltage Error Amplifier, EA
Transconductance
1
OVSD
Sink Current
Measured at ITH, VITH = 1.4V
Overvoltage Shutdown Threshold as a Percent of
Programmed Charger Voltage
36
l 102
107
110
Input P-Channel FET Driver (INFET)
DCIN Detection Threshold (VDCIN – VCLN)
Forward Regulation Voltage (VDCIN – VCLN)
DCIN Voltage Ramping Up
from VCLN – 0.1V
l
0
l
0.17
0.25
25
50
Reverse Voltage Turn-Off Voltage (VDCIN – VCLN) DCIN Voltage Ramping Down
l –60
–25
INFET “On” Clamping Voltage (VDCIN – VINFET)
INFET “Off” Clamping Voltage (VDCIN – VINFET)
Thermistor
IINFET = 1µA
IINFET = –25µA
l
5
5.8
6.5
0.25
NTCVR Reference Voltage During Sample Time
4.5
High Threshold
VNTC Rising
l NTCVR NTCVR NTCVR
0.48
0.5
0.52
Low Threshold
VNTC Falling
l NTCVR NTCVR NTCVR
0.115 0.125 0.135
Thermistor Disable Current
VNTC ≤ 10V
10
Indicator Outputs (ACP, CHG, FLAG, LOBAT, ICL, FAULT
C10TOL FLAG (C/10) Accuracy
Voltage Falling at PROG
l 0.375 0.397 0.420
LBTOL LOBAT Threshold Accuracy
3C4C = 0V, CHEM = 0V
3C4C = 0V, CHEM = Open
3C4C = Open, CHEM = 0V
3C4C = Open, CHEM = Open
l 9.233
l 9.458
l 12.311
l 12.610
9.519
9.750
12.692
13.000
9.805
10.043
13.074
13.390
ICL Threshold Accuracy
83
93
1O5
UNITS
µA
mA
µA
V
V
mV
mV
mmho
µA
µA
mmho
mV
nA
mmho
µA
%
V
mV
mV
V
V
V
V
V
µA
V
V
V
V
V
mV
40071fa
For more information www.linear.com/LTC4007-1
3






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