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Linear Technology Electronic Components Datasheet

LTC4000 Datasheet

High Voltage High Current Controller

No Preview Available !

LTC4000
Features
High Voltage High Current
Controller for Battery Charging
and Power Management
Description
n Complete High Performance Battery Charger When
Paired with a DC/DC Converter
n Wide Input and Output Voltage Range: 3V to 60V
n Input Ideal Diode for Low Loss Reverse Blocking
and Load Sharing
n Output Ideal Diode for Low Loss PowerPath™ and
Load Sharing with the Battery
n Instant-On Operation with Heavily Discharged
Battery
n Programmable Input and Charge Current:
±1% Accuracy
n ±0.25% Accurate Programmable Float Voltage
n Programmable C/X or Timer Based Charge
Termination
n NTC Input for Temperature Qualified Charging
n 28-Lead 4mm × 5mm QFN or SSOP Packages
Applications
n High Power Battery Charger Systems
n High Performance Portable Instruments
n Industrial Battery Equipped Devices
n Notebook/Subnotebook Computers
The LTC®4000 is a high voltage, high performance controller
that converts many externally compensated DC/DC power
supplies into full-featured battery chargers.
Features of the LTC4000’s battery charger include: accurate
(±0.25%) programmable float voltage, selectable timer or
current termination, temperature qualified charging using
an NTC thermistor, automatic recharge, C/10 trickle charge
for deeply discharged cells, bad battery detection and
status indicator outputs. The battery charger also includes
precision current sensing that allows lower sense voltages
for high current applications.
The LTC4000 supports intelligent PowerPath control. An
external PFET provides low loss reverse current protec-
tion. Another external PFET provides low loss charging
or discharging of the battery. This second PFET also
facilitates an instant-on feature that provides immediate
downstream system power even when connected to a
heavily discharged or short faulted battery.
The LTC4000 is available in a low profile 28-lead 4mm ×
5mm QFN and SSOP packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
48V to 10.8V at 10A Buck Converter Charger for Three LiFePO4 Cells
15V TO 60V
5mΩ
IN SHDN
LT3845A
VC
OUT
100µF
Si7135DP
14.7k
1.10M
ITH
RST
CLN
IN
1µF
100k
VM
3.0V ENC
CHRG
FLT
10nF
IIMON
IBMON
10nF TMR
47nF
CC
IID IGATE CSP
CSN
BGATE
BAT
OFB
LTC4000
FBG
BFB
NTC
CL CX GND BIAS
0.1µF
24.9k 22.1k
1µF
1.15M
VOUT
12V, 15A
5mΩ
Si7135DP
127k
133k
1.13M
VBAT
10.8V FLOAT
10A MAX CHARGE
CURRENT
10k
10k
3-CELL LiFePO4
BATTERY PACK
NTHS0603
N02N1002J
4000 TA01a
For more information www.linear.com/LTC4000
Charge Current
vs VBAT During
aanCdhVaOrgUeT
Profile
Cycle
12 11
10
ICHARGE
VOUT
10.5
8 VOUT
6
10
9.5
49
2 ICHARGE
0
6 7 8 9 10
VBAT (V)
8.5
8
11 12
4000 TA01b
4000fb
1


Linear Technology Electronic Components Datasheet

LTC4000 Datasheet

High Voltage High Current Controller

No Preview Available !

LTC4000
Absolute Maximum Ratings
(Note 1)
IN, CLN, IID, CSP, CSN, BAT........................ –0.3V to 62V
IN-CLN, CSP-CSN.............................................–1V to 1V
OFB, BFB, FBG............................................ –0.3V to 62V
FBG.............................................................–1mA to 2mA
IGATE............Max (VIID, VCSP) – 10V to Max (VIID, VCSP)
BGATE........Max (VBAT, VCSN) – 10V to Max (VBAT, VCSN)
ENC, CX, NTC, VM....................................–0.3V to VBIAS
IL, CL, TMR, IIMON, CC............................–0.3V to VBIAS
BIAS..............................................–0.3V to Min (6V, VIN)
IBMON...................................–0.3V to Min (VBIAS, VCSP)
ITH................................................................ –0.3V to 6V
CHRG, FLT, RST........................................... –0.3V to 62V
CHRG, FLT, RST...........................................–1mA to 2mA
Operating Junction Temperature Range
(Note 2).................................................................. 125°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
28 27 26 25 24 23
VM 1
22 IGATE
RST 2
21 OFB
IIMON 3
20 CSP
IL 4
29 19 CSN
ENC 5 GND 18 BGATE
IBMON 6
17 BAT
CX 7
16 BFB
CL 8
15 FBG
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 4°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
ENC 1
IBMON 2
CX 3
CL 4
TMR 5
GND 6
FLT 7
CHRG 8
BIAS 9
NTC 10
FBG 11
BFB 12
BAT 13
BGATE 14
28 IL
27 IIMON
26 RST
25 VM
24 GND
23 IN
22 CLN
21 CC
20 ITH
19 IID
18 IGATE
17 OFB
16 CSP
15 CSN
GN PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 80°C/W, θJC = 25°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4000EUFD#PBF
LTC4000EUFD#TRPBF 4000
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC4000IUFD#PBF
LTC4000IUFD#TRPBF 4000
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC4000EGN#PBF
LTC4000EGN#TRPBF
LTC4000GN
28-Lead Plastic SSOP
–40°C to 125°C
LTC4000IGN#PBF
LTC4000IGN#TRPBF
LTC4000GN
28-Lead Plastic SSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
4000fb
2 For more information www.linear.com/LTC4000


Part Number LTC4000
Description High Voltage High Current Controller
Maker Linear Technology
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LTC4000 Datasheet PDF






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