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Linear Technology Electronic Components Datasheet

LTC4069EDC-4.4 Datasheet

Standalone 750mA Li-Ion Battery Charger

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LTC4069-4.4 www.DataSheet4U.com
FEATURES
Standalone 750mA Li-Ion
Battery Charger in 2 × 2 DFN
with NTC Thermistor Input
DESCRIPTION
n Complete Linear Charger in 2mm × 2mm DFN
Package
n C/10 Charge Current Detection Output
n Timer Charge Termination
n Charge Current Programmable Up to 750mA with
5% Accuracy
n No External MOSFET, Sense Resistor or Blocking
Diode Required
n NTC Thermistor Input for Temperature Qualified
Charging
n Preset 4.4V Float Voltage with 0.6% Accuracy
n Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charge Rate
Without Risk of Overheating
n Charge Current Monitor Output for Gas Gauging
n Automatic Recharge
n Charges Single-Cell Li-Ion Batteries Directly from
USB Port
n 20μA Supply Current in Shutdown Mode
n Soft-Start Limits Inrush Current
n Tiny 6-Lead (2mm × 2mm) DFN Package
APPLICATIONS
n Wireless PDAs
n Cellular Phones
n Portable Electronics
, 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 6522118, 6700364.
The LTC®4069-4.4 is a complete constant-current/
constant-voltage linear charger for high capacity single-cell
lithium-ion batteries with a 4.4V float voltage. The 2mm
× 2mm DFN package and low external component count
make the LTC4069-4.4 especially well-suited for portable
applications. Furthermore, LTC4069-4.4 is specifically
designed to work within USB power specifications.
The CHRG pin indicates when charge current has dropped
to ten percent of its programmed value (C/10). An
internal timer terminates charging according to battery
manufacturer specifications.
No external sense resistor or blocking diode is required due to
the internal MOSFET architecture. Thermal feedback regulates
charge current to limit the die temperature during high power
operation or high ambient temperature conditions.
When the input supply (wall adapter or USB supply) is
removed, the LTC4069-4.4 automatically enters a low current
state, dropping battery drain current to less than 1μA. With
power applied, LTC4069-4.4 can be put into shutdown mode,
reducing the supply current to less than 20μA.
The LTC4069-4.4 also includes automatic recharge, low-
battery charge conditioning (trickle charging), soft-start
(to limit inrush current) and an NTC thermistor input used
to monitor battery temperature.
The LTC4069-4.4 is available in a tiny 6-lead, low profile
(0.75mm) 2mm × 2mm DFN package.
TYPICAL APPLICATION
Standalone Li-Ion Battery Charger
VIN
4.5V TO 5.5V
RNOM
100k
R1
510Ω
RNTC
1μF
100k
VCC BAT
LTC4069-4.4
CHRG PROG
NTC GND
500mA
+
RPROG
2k
4.4V
Li-Ion
BATTERY*
4069 TA01
*E.G. SANYO BATTERIES: UF553436T OR UF553450T
Complete Charge Cycle (1100mAh Battery)
550
4.5
500 CONSTANT-CURRENT
4.4
450
400
350 CONSTANT-
300 VOLTAGE
4.3
CHRG
TRANSITION
4.2
4.1
4.0
250
3.9
200
3.8
150
100
50
0
0
3.7
CHARGE
3.6
VCC = 5V
TERMINATION
3.5
RPROG = 2K
3.4
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
TIME (HOURS)
4069 TA01b
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Linear Technology Electronic Components Datasheet

LTC4069EDC-4.4 Datasheet

Standalone 750mA Li-Ion Battery Charger

No Preview Available !

LTC4069-4.4
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VCC
t < 1ms and Duty Cycle < 1% ................. – 0.3V to 7V
Steady State............................................ – 0.3V to 6V
BAT, CHRG .................................................. –0.3V to 6V
PROG, NTC ..................................... – 0.3V to VCC + 0.3V
BAT Short-Circuit Duration............................Continuous
BAT Pin Current .................................................. 800mA
PROG Pin Current ................................................ 800μA
Junction Temperature (Note 6) ............................ 125°C
Operating Temperature Range (Note 2)....– 40°C to 85°C
Storage Temperature Range.................. –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
GND 1
CHRG 2
7
BAT 3
6 PROG
5 NTC
4 VCC
DC PACKAGE
6-LEAD (2mm s 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 60°C/W (NOTE 3)
EXPOSED PAD (PIN 7) IS GND
MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC4069EDC-4.4#PBF
LTC4069EDC-4.4#TRPBF LCKQ
6-Lead (2mm X 2mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS
The l denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VCC = 5V, VBAT = 3.8V, VNTC = 0V unless otherwise specified. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
VCC
ICC
ICCMS
ICCUV
VFLOAT
IBAT
IBMS
IBUV
VCC Supply Voltage
(Note 4)
l 3.75
5.5
Quiescent VCC Supply Current
VBAT = 4.5V (Forces IBAT and IPROG = 0) l
120
250
VCC Supply Current in Shutdown
Float PROG
l
20
40
VCC Supply Current in Undervoltage Lockout VCC < VBAT, VCC = 3.5V, VBAT = 4V
l
6
11
VBAT Regulated Output Voltage
IBAT = 2mA
IBAT = 2mA, 0°C < TA < 85°C
4.375
4.4
4.425
4.358
4.4
4.442
BAT Pin Current
RPROG = 10k (0.1%), Current Mode
RPROG = 2k (0.1%), Current Mode
l 88
100
112
l 475
500
525
Battery Drain Current in Shutdown Mode
Floating PROG, VCC > VBAT
l –1
0
1
Battery Drain Current in Undervoltage
Lockout
VCC = 3.5V, VBAT = 4V
l0
1
4
VUVLO
VPROG
VCC Undervoltage Lockout Voltage
PROG Pin Voltage
VCC Rising
VCC Falling
RPROG = 2k, IPROG = 500μA
RPROG = 10k, IPROG = 100μA
l 3.4
3.6
3.8
l 2.8
3
3.2
l 0.98
1
1.02
l 0.98
1
1.02
VASD
Automatic Shutdown Threshold Voltage
(VCC – VBAT), VCC Low to High
(VCC – VBAT), VCC High to Low
60
80
100
15
30
45
UNITS
V
μA
μA
μA
V
V
mA
mA
μA
μA
V
V
V
V
mV
mV
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2


Part Number LTC4069EDC-4.4
Description Standalone 750mA Li-Ion Battery Charger
Maker Linear
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LTC4069EDC-4.4 Datasheet PDF






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