LTC4007EUFD-1#TRPBF Linear Technology, LTC4007EUFD-1#TRPBF Datasheet

IC CHARGER BATTERY 4A 24-QFN

LTC4007EUFD-1#TRPBF

Manufacturer Part Number
LTC4007EUFD-1#TRPBF
Description
IC CHARGER BATTERY 4A 24-QFN
Manufacturer
Linear Technology
Type
Battery Chargerr
Datasheet

Specifications of LTC4007EUFD-1#TRPBF

Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion)
Voltage - Supply
6 V ~ 28 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-WFQFN Exposed Pad
Output Current
4A
Output Voltage
4.1/4.2V
Operating Supply Voltage (min)
6V
Operating Supply Voltage (max)
28V
Operating Temp Range
-40C to 85C
Package Type
QFN
Mounting
Surface Mount
Pin Count
24
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
LTC4007EUFD-1#TRPBFLTC4007EUFD-1
Manufacturer:
LT
Quantity:
10 000
Price:
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Charger Controller for 3- or 4-Cell
Lithium-Ion Batteries
High Conversion Efficiency: Up to 96%
Output Currents Exceeding 4A
±0.8% Charging Voltage Accuracy
Built-In Charge Termination for Li-Ion Batteries
AC Adapter Current Limiting Maximizes Charge Rate*
Thermistor Input for Temperature Qualified Charging
Wide Input Voltage Range: 6V to 28V
0.5V Dropout Voltage; Maximum Duty Cycle: 98%
Programmable Charge Current: ±4% Accuracy
Indicator Outputs for Charging, C/10 Current
Detection, AC Adapter Present, Low Battery, Input
Current Limiting and Faults
Charging Current Monitor Output
Available in a 24-Pin 4mm × 5mm QFN Package
Notebook Computers
Portable Instruments
Battery-Backup Systems
Li-Ion Chargers
0V TO 28V
V
LOBAT
FAULT
SHDN
LOGIC
FLAG
DCIN
CHG
ACP
THERMISTOR
I
CL
NTC
10k
100k
100k
U
100k
0.47µF
309k
32.4k
TIMING RESISTOR
(~2 HOURS)
3C4C
CHEM
LOBAT
I
ACP
SHDN
FAULT
CHG
FLAG
NTC
R
CL
T
LTC4007-1
U
BGATE
TGATE
PGND
PROG
INFET
DCIN
GND
CLP
CLN
CSP
BAT
ITH
12.6V, 4A Li-Ion Battery Charger
0.1µF
6.04k
INPUT SWITCH
0.12µF
3.01k
0.0047µF
26.7k
3.01k
4.99k
15nF
Q1
Q2
DESCRIPTIO
The LTC
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,
programmed by an external resistor, sets the total charge
time.
The LTC4007-1 includes a thermistor input, which sus-
pends charging if an unsafe temperature condition is de-
tected. 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.
0.025Ω
trademarks are the property of their respective owners.
*Protected by U.S. Patents including 5723970.
40071
Q1: Si4431BDY
Q2: FDC645N
TA01
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
20µF
10µH
®
4007-1 is a constant-current/constant-voltage
Li-Ion Battery Charger
0.025Ω
4A, High Efficiency,
U
SYSTEM
LOAD
CHARGING
CURRENT
MONITOR
20µF
PART
LTC4007-1
LTC4007
Li-Ion
BATTERY
LTC4007-1
RESTART
AUTO
YES
NO
THRESHOLD (Per Cell)
LOW BATTERY
3.25V/3.173V
(4.2V/4.1V)
2.5V/2.44V
40071f
1

Related parts for LTC4007EUFD-1#TRPBF

LTC4007EUFD-1#TRPBF Summary of contents

Page 1

... 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. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Protected by U.S. Patents including 5723970. ...

Page 2

... PACKAGE/ORDER + 32V/– 0.3V EXPOSED PAD (PIN 25), GND AND PGND SHOULD BE CONNECTED ORDER PART NUMBER LTC4007EUFD-1 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range (Note 4), otherwise specifications are at T SYMBOL PARAMETER Current Sense Amplifier, CA1 Input Bias Current Into BAT Pin CMSL CA1/I Input Common Mode Low 1 CMSH CA1/I Input Common Mode High 1 Current Comparators I ...

Page 4

LTC4007-1 ELECTRICAL CHARACTERISTICS temperature range (Note 4), otherwise specifications are at T SYMBOL PARAMETER V Low Logic Level of ACP, CHG, FLAG, LOBAT FAULT CL V High Logic Level of CHG, LOBAT Off State ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS INFET Response Time to Reverse Current V OF PFET (2V/DIV PFET (5V/DIV (REVERSE PFET (5A/DIV ...

Page 6

LTC4007 TYPICAL PERFOR A CE CHARACTERISTICS Efficiency at 19VDC V 100 16.8V 95 12. 0.50 1.00 1.50 CHARGE CURRENT ( CTIO S ACP(Pin 1): Open-Drain output to indicate if ...

Page 7

CTIO S PROG (Pin 9): Current Programming/Monitoring Input/ Output. An external resistor to GND programs the peak charging current in conjunction with the current sensing resistor. The voltage at this pin provides a linear indication ...

Page 8

LTC4007-1 W BLOCK DIAGRA 0.1µ DCIN 23 5.8V INFET Q3 21 ACP 1 SHDN 22 FAULT 3 FLAG 14 GND 4 3C4C 5 CHEM 13 + LOBAT 6 – 921mV 1.19V 5k CLP Ω – 1.4m ...

Page 9

TEST CIRCUIT U OPERATIO Overview The LTC4007 synchronous current mode PWM step-down (buck) switcher battery charger controller. The charge current is programmed by the combination of a program resistor (R ) from the PROG pin to ground PROG ...

Page 10

LTC4007-1 U OPERATIO Table 1. Truth Table for LTC4007-1 Operation (Supplemental) FROM TO NUMBER STATE STATE MODE 1 Any MSD Shut Down by Low Adapter Voltage 2 MSD SD Charger Shutdown 3 SD, SD Shut Down by CONDITION, Undervoltage Lockout ...

Page 11

U OPERATIO gate of the input FET is driven to a voltage sufficient to keep a low forward voltage drop from drain to source. If the voltage between DCIN and CLN drops to less than 25mV, the input FET is ...

Page 12

LTC4007-1 U OPERATIO adjusts ITH until: + µ – REF = CSP BAT Ω PROG therefore, ⎛ V REF = ⎜ I – CHARGE MAX ( ...

Page 13

U OPERATIO the timing resistor connected to R closed to sample the thermistor 127.5 • 20 • R • 17.5pF = 13.8ms, SAMPLE RT for R = 309k RT The external RC network is driven to approximately 4.5V ...

Page 14

LTC4007 APPLICATIO S I FOR ATIO Battery Detection It is generally not good practice to connect a battery while the charger is running. The timer unknown state and the charger could provide a large surge ...

Page 15

U U APPLICATIO S I FOR ATIO the full-scale voltage is reduced then 2.49k and R = 26.7k, the maximum charging current is still 2.5A PROG but the FLAG trip point is maintained at 10% of ...

Page 16

LTC4007 APPLICATIO S I FOR ATIO used when tantalum capacitors are used for input or output bypass . High input surge currents can be created when the adapter is hot-plugged to the charger or when a battery is ...

Page 17

U U APPLICATIO S I FOR ATIO Charger Switching Power MOSFET and Diode Selection Two external power MOSFETs must be selected for use with the charger: a P-channel MOSFET for the top (main) switch and an N-channel MOSFET for the ...

Page 18

LTC4007 APPLICATIO S I FOR ATIO Adapter Limiting An important feature of the LTC4007-1 is the ability to automatically adjust charging current to a level which avoids overloading the wall adapter. This allows the prod- uct to operate ...

Page 19

U U APPLICATIO S I FOR ATIO LTC4007-1 R9 NTC 7 C7 Figure 10. General Thermistor Network If you are using a thermistor that doesn’t have a 1:7 HIGH/ LOW ratio, or you wish to set the HIGH/LOW limits to ...

Page 20

LTC4007 APPLICATIO S I FOR ATIO Disabling the Thermistor Function If the thermistor is not needed, connecting a resistor between DCIN and NTC will disable it. The resistor should be sized to provide at least 10µA with the ...

Page 21

U U APPLICATIO S I FOR ATIO General Rules (Continued) 7. Connection of switching ground to system ground or internal ground plane should be single point. If the system has an internal system ground plane, a good way to do ...

Page 22

LTC4007 APPLICATIO S I FOR ATIO DCIN 0V TO 20V 3A 3C4C V * LOGIC R10 R11 R12 CHEM * 100k 100k 100k LOBAT LOBAT ACP ACP SHDN SHDN FAULT FAULT CHG CHG FLAG ...

Page 23

... DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. W ...

Page 24

... High Efficiency, Standalone Li-Ion Battery Charger Complete Charger for 3- or 4-Cell Li-Ion Batteries, AC Adapter Current Limit LTC4008 High Efficiency, Programmable Voltage/Current Battery Charger LTC4100 Smart Battery Charger Controller trademark of Linear Technology Corporation. SENSE Linear Technology Corporation 24 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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