IC CHARGER BATTERY 4A 16-SSOP

LTC4006EGN-2#TR

Manufacturer Part NumberLTC4006EGN-2#TR
DescriptionIC CHARGER BATTERY 4A 16-SSOP
ManufacturerLinear Technology
LTC4006EGN-2#TR datasheet
 

Specifications of LTC4006EGN-2#TR

FunctionCharge ManagementBattery TypeLithium-Ion (Li-Ion)
Voltage - Supply6 V ~ 28 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case16-SSOP (0.150", 3.90mm Width)
Output Current4AOutput Voltage12.6V
Operating Supply Voltage (min)6VOperating Supply Voltage (max)28V
Operating Temp Range-40C to 85CPackage TypeSSOP N
MountingSurface MountPin Count16
Operating Temperature ClassificationIndustrialLead Free Status / RoHS StatusContains lead / RoHS non-compliant
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FEATURES
Complete Charger Controller for 2-, 3- or 4-Cell
Lithium-Ion Batteries
High Conversion Efficiency: Up to 96%
Output Currents Exceeding 4A
±0.8% Accurate Preset Voltages: 8.4V, 12.6V, 16.8V
Built-In Charge Termination with Automatic Restart
AC Adapter Current Limiting Maximizes Charge Rate*
Automatic Conditioning of Deeply Discharged
Batteries
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 and AC Adapter Present
Charging Current Monitor Output
16-Pin Narrow SSOP Package
U
APPLICATIO S
Notebook Computers
Portable Instruments
Battery-Backup Systems
Standalone Li-Ion Chargers
U
TYPICAL APPLICATIO
DCIN
0V TO 28V
3A
V
LOGIC
CHG
ACP
CHARGING
CURRENT MONITOR
0.0047µF
THERMISTOR
10k
NTC
RESISTOR
0.47µF
(~2 HOURS)
DESCRIPTIO
®
The LTC
voltage charger controller for 2-, 3- or 4-cell lithium bat-
teries in a small package using few external components.
The PWM controller is a synchronous, quasi-constant fre-
quency, constant off-time architecture that will not gener-
ate audible noise even when using ceramic capacitors.
The LTC4006 is available in 8.4V, 12.6V and 16.8V versions
with ±0.8% voltage accuracy. Charging current is program-
mable with a single sense resistor to ±4% typical accuracy.
Charging current can be monitored as a representative
voltage at the I
resistor, sets the total charge time or is reset to 25% of total
charge time after C/10 charging current is reached. Charg-
ing automatically resumes when the cell voltage falls below
3.9V/cell.
Fully discharged cells are automatically trickle charged at
10% of the programmed current until the cell voltage ex-
ceeds 2.5V/cell. Charging terminates if the low-battery
condition persists for more than 25% of the total charge
time.
The LTC4006 includes a thermistor sensor input that
suspends charging if an unsafe temperature condition is
detected and automatically resumes charging when the
battery temperature returns to within safe limits.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5723970.
4A Li-Ion Battery Charger
INPUT SWITCH
0.1µF
DCIN
INFET
100k
LTC4006
CHG
CLP
ACP/SHDN
CLN
I
TGATE
MON
32.4k
NTC
BGATE
R
PGND
T
I
CSP
TH
309k
TIMING
6k
GND
BAT
0.12µF
LTC4006
4A, High Efficiency,
Standalone Li-Ion
Battery Charger
U
4006 is a complete constant-current/constant-
pin. A timer, programmed by an external
MON
5k
15nF
0.033Ω
TO SYSTEM LOAD
20µF
10µH
0.025Ω
BATTERY
20µF
4006 TA01
4006fa
1

LTC4006EGN-2#TR Summary of contents

  • Page 1

    ... LT, LTC and LTM 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

    ... SHDN CLN, DCIN U W INFORMATION TOP VIEW ORDER PART 1 16 INFET NUMBER 2 15 BGATE LTC4006EGN PGND LTC4006EGN TGATE LTC4006EGN CLN 6 11 CLP GN PART MARKING 7 10 BAT 8 9 CSP 40062 GN PACKAGE 40064 16-LEAD PLASTIC SSOP 40066 = 125°C, θ = 110°C/W JA http://www.linear.com/leadfree/ = 12V unless otherwise noted ...

  • Page 3

    ELECTRICAL CHARACTERISTICS temperature range (Note 4), otherwise specifications are at T SYMBOL PARAMETER Current Comparators I and I CMP REV I Maximum Current Sense Threshold (V TMAX I Reverse Current Threshold (V TREV CSP Current Sense Amplifier, CA2 Transconductance Source ...

  • Page 4

    LTC4006 ELECTRICAL CHARACTERISTICS temperature range (Note 4), otherwise specifications are at T SYMBOL PARAMETER Oscillator f Regulator Switching Frequency OSC f Regulator Switching Frequency in Drop Out MIN DC Regulator Maximum Duty Cycle MAX Gate Drivers (TGATE, BGATE) V High ...

  • Page 5

    W U TYPICAL PERFOR A CE CHARACTERISTICS Disconnect/Reconnect Battery (Load Dump) 3A STEP 1A STEP V FLOAT 1V/(DIV) LOAD STATE DISCONNECT LOAD CURRENT = 1A, 2A, 3A DCIN = 20V LTC4006-2 Efficiency at 19VDC V 100 LTC4006 ...

  • Page 6

    LTC4006 CTIO S R (Pin 4): Timer Resistor. The timer period is set by T placing a resistor GND. RT The timer period (1hour • R TIMER If this ...

  • Page 7

    W BLOCK DIAGRA V IN DCIN 1 0.1µF 5.8V INFET Q3 16 ACP/SHDN 3 GND 5 5.1k CLP – 15nF CL1 CL 100mV CLN + 12 OSCILLATOR WATCH DOG 20µF DETECT TGATE Q1 13 BGATE Q2 15 PGND ...

  • Page 8

    LTC4006 U OPERATIO Overview The LTC4006 is a synchronous current mode PWM step- down (buck) switcher battery charger controller. The charge current is programmed by the sense resistor (R between the CSP and BAT pins. The final float voltage is ...

  • Page 9

    U OPERATIO Table 1. Truth Table for LTC4006 Operation MODE Shut Down by Low Adapter Voltage Conditioning a Depleted Battery Normal Charging Input Current Limited Charging Charger Paused Due to Thermistor Out of Range Shut Down by ACP/SHDN Pin Terminated ...

  • Page 10

    LTC4006 U OPERATIO Table 2. Truth Table for LTC4006 Operation (Supplemental) FROM TO NUMBER STATE STATE MODE 1 Any MSD Shut Down by Low Adapter Voltage 2 MSD SD Charge Shutdown 3 SD, SD Shut Down by Undervoltage Lockout CONDITION, ...

  • Page 11

    U OPERATIO be inhibited not already active. If the charging current decreases below 10% to 15% of programmed current, while engaged in input current limiting, BGATE will be forced low to prevent the charger from discharging the ...

  • Page 12

    LTC4006 U U APPLICATIO S I FOR ATIO Charger Current Programming The basic formula for charging current is: 100 CHARGE MAX ( ) R SENSE Table 3. Recommended R Resistor Values SENSE I (A) R (Ω) 1% ...

  • Page 13

    U U APPLICATIO S I FOR ATIO Soft-Start The LTC4006 is soft started by the 0.12µF capacitor on the I pin. On start-up, I pin voltage will rise quickly to 0.5V then ramp rate set ...

  • Page 14

    LTC4006 U U APPLICATIO S I FOR ATIO Table 4 MAXIMUM INPUT AVERAGE CURRENT (A) VOLTAGE (V) ≤ > 20 ≤ > 20 ≤ > 20 ≤ > ...

  • Page 15

    U U APPLICATIO S I FOR ATIO Example 19V 345kHz, Q DCIN OSC 292mW I = 5mA DCIN Adapter Limiting An important feature of the LTC4006 is the ability to automatically adjust charging ...

  • Page 16

    LTC4006 U U APPLICATIO S I FOR ATIO LTC4006 R9 NTC 6 C7 Figure 10. Voltage Divider Thermistor Network you, then simply set TH(LOW) If you are using a thermistor that doesn’t have a 1:7 HIGH/ LOW ...

  • Page 17

    U U APPLICATIO S I FOR ATIO 100k V IN Q1A TGATE INDUCTOR Figure 12. Optional Simple High Efficiency Battery Discharge Path 0V keeping Q1B in the off state while P-channel MOSFET Q1A is on were to suddenly ...

  • Page 18

    LTC4006 U U APPLICATIO S I FOR ATIO 4. Place the output current sense resistor right next to the inductor output but oriented such that the IC’s current sense feedback traces going to resistor are not long. The feedback traces ...

  • Page 19

    ... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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. ...

  • Page 20

    ... High Efficiency, Programmable Voltage/Current Battery Charger LTC4100 Smart Battery Charger Controller TM LTC4412 PowerPath Ideal Diode or Controller No R and PowerPath are trademarks of Linear Technology Corporation. SENSE Linear Technology Corporation 20 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● 2A Li-Ion Battery Charger ...