IC CHARGER BATTERY 4A 24-QFN

LTC4007EUFD-1#TRPBF

Manufacturer Part NumberLTC4007EUFD-1#TRPBF
DescriptionIC CHARGER BATTERY 4A 24-QFN
ManufacturerLinear Technology
TypeBattery Charger
LTC4007EUFD-1#TRPBF datasheet
 

Specifications of LTC4007EUFD-1#TRPBF

FunctionCharge ManagementBattery TypeLithium-Ion (Li-Ion)
Voltage - Supply6 V ~ 28 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case24-WFQFN Exposed Pad
Output Current4AOutput Voltage4.1/4.2V
Operating Supply Voltage (min)6VOperating Supply Voltage (max)28V
Operating Temp Range-40C to 85CPackage TypeQFN
MountingSurface MountPin Count24
Operating Temperature ClassificationIndustrialLead Free Status / RoHS StatusLead free / RoHS Compliant
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FEATURES
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
U
APPLICATIO S
Notebook Computers
Portable Instruments
Battery-Backup Systems
Li-Ion Chargers
U
TYPICAL APPLICATIO
DCIN
0V TO 28V
3C4C
V
LOGIC
100k
100k
100k
CHEM
LOBAT
LOBAT
I
I
LTC4007-1
CL
CL
ACP
ACP
SHDN
SHDN
FAULT
FAULT
CHG
CHG
FLAG
FLAG
32.4k
NTC
R
T
THERMISTOR
0.47µF
10k
NTC
TIMING RESISTOR
309k
(~2 HOURS)
Li-Ion Battery Charger
DESCRIPTIO
®
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,
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.
, 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.
12.6V, 4A Li-Ion Battery Charger
INPUT SWITCH
0.1µF
4.99k
DCIN
15nF
0.025Ω
INFET
CLP
CLN
20µF
TGATE
Q1
10µH
BGATE
Q2
PGND
CSP
3.01k
BAT
3.01k
PROG
ITH
0.0047µF
GND
6.04k
Q1: Si4431BDY
Q2: FDC645N
26.7k
0.12µF
40071
TA01
LTC4007-1
4A, High Efficiency,
U
LOW BATTERY
AUTO
THRESHOLD (Per Cell)
PART
RESTART
(4.2V/4.1V)
LTC4007-1
NO
3.25V/3.173V
LTC4007
YES
2.5V/2.44V
SYSTEM
LOAD
0.025Ω
Li-Ion
BATTERY
20µF
CHARGING
CURRENT
MONITOR
40071f
1

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 ● ...