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PDF LTC4065-4.4 Data sheet ( Hoja de datos )
| Número de pieza | LTC4065-4.4 | |
| Descripción | Standalone 750mA Li-Ion Battery Charge | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4065-4.4
Standalone 750mA Li-Ion
Battery Charger in 2 × 2 DFN
FEATURES
■ Complete Linear Charger in 2mm × 2mm DFN
Package
■ C/10 Charge Current Detection Output
■ Timer Termination
■ Charge Current Programmable Up to 750mA with
5% Accuracy
■ No External MOSFET, Sense Resistor or Blocking
www.DaDtiaoSdheeeRt4eUq.cuoirmed
■ Preset 4.4V Float Voltage with 0.6% Accuracy
■ Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating
■ Charge Current Monitor Output for Gas Gauging
■ Automatic Recharge
■ Charges Single-cell Li-Ion Batteries Directly from
USB Port
■ 20µA Supply Current in Shutdown Mode
■ Soft-Start Limits Inrush Current
■ Tiny 6-Lead (2mm × 2mm) DFN Package
U
APPLICATIO S
■ Wireless PDAs
■ Cellular Phones
■ 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.
DESCRIPTIO
The LTC®4065-4.4 is a complete constant-current/con-
stant-voltage linear charger for high capacity single-cell
lithium-ion batteries with a 4.4V float voltage. Its 2mm ×
2mm DFN package and low external component count
make the LTC4065-4.4 especially well-suited for portable
applications. Furthermore, LTC4065-4.4 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 manufac-
turer specifications.
No external sense resistor or blocking diode is required due
to the internal MOSFET architecture. Thermal feedback regu-
lates 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 LTC4065-4.4 automatically enters a low cur-
rent state, dropping battery drain current to less than
1µA. With power applied, LTC4065-4.4 can be put into shut-
down mode, reducing the supply current to less than 20µA.
The full-featured LTC4065-4.4 also includes automatic
recharge, low-battery charge conditioning (trickle charg-
ing) and soft-start (to limit inrush current).
The LTC4065-4.4 is available in a tiny 6-lead, low profile
(0.75mm) 2mm × 2mm DFN package.
TYPICAL APPLICATIO
Standalone Li-Ion Battery Charger
VIN
4.5V TO
5.5V
R1
510Ω
C1
1µF
VCC BAT
LTC4065-4.4
CHRG PROG
EN GND
500mA
+ 4.4V
Li-Ion
R3 BATTERY*
2k
4065 TA01
*E.G. SANYO BATTERIES: UF553436T OR UF553450T
Complete Charge Cycle (1100mAh Battery)
550
500 CONSTANT-CURRENT
450
400
CONSTANT-
VOLTAGE
4.5
4.4
4.3
4.2
350 4.1
300 4.0
250
CHRG
3.9
200 TRANSITION 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)
4065 TA01b
406544f
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
Undervoltage Lockout Threshold
Voltage vs Temperature
4.0
3.8
RISE
3.5
3.3
FALL
3.0
www.D2a.8taSheet4U.com
2.5
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
4065 G16
EN Pin Current
4.0
VCC = 5V
3.5 TA = 25°C
3.0
2.5
2.0
1.5
1.0
0.5
0
2 2.5 3 3.5 4
VEN (V)
4.5 5
4065 G13
CHRG Pin Output Low Voltage
vs Temperature
140
VCC = 5V
120 ICHRG = 5mA
100
80
60
40
20
0
–50 –25
0
25 50 75
TEMPERATURE (°C)
100
4065 G10
Manual Shutdown Threshold
Voltage vs Temperature
1.0
0.9
RISE
0.8
FALL
0.7
0.6
0.5
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
4065 G11
Trickle Charge Current
vs Supply Voltage
60
VBAT = 2V
TA = 25°C
50
RPROG = 2k
40
30
20
RPROG = 10k
10
0
4 4.5 5 5.5 6
SUPPLY VOLTAGE (V)
4065 G14
Timer Accuracy vs Temperature
1
VCC = 5V
0
–1
–2
–3
–4
–5
–6
–7
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
4065 G18
LTC4065-4.4
Manual Shutdown Supply Current
vs Temperature
40
VCC = 5V
VEN = 5V
30
20
10
0
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
4065 G12
Trickle Charge Current
vs Temperature
60
VCC = 5V
VBAT = 2V
50
RPROG = 2k
40
30
20
RPROG = 10k
10
0
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
4065 G15
Timer Accuracy vs Supply Voltage
2.0
TA = 25°C
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
4
4.5 5 5.5
SUPPLY VOLTAGE (V)
6
4065 G19
406544f
5
5 Page 
U
OPERATIO
POWER
ON
LTC4065-4.4
ENABLE
IS EN > SHUTDOWN
THRESHOLD?
YES
SHUTDOWN MODE
CHRG HIGH IMPEDANCE
UVLO
NO
IF VCC > 3.6V AND
VCC > VBAT + 80mV?
YES
UVLO MODE
NO
CHRG HIGH IMPEDANCE
www.DataSheet4U.com
VBAT ≤ 2.9V
2.9V < VBAT < 4.3V
TRICKLE CHARGE MODE
1/10 FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
FAST CHARGE MODE
FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
1/4 CHARGE CYCLE
(1.125 HOURS)
NO CHARGE CYCLE
(4.5 HOURS)
NO
DEFECTIVE BATTERY
IS VBAT < 2.9V?
RECHARGE
IS VBAT < 4.3V?
VBAT > 4.3V
STANDBY MODE
NO CHARGE CURRENT
CHRG HIGH IMPEDANCE
YES
BAD BATTERY MODE
NO CHARGE CURRENT
CHRG PULSES (2Hz)
VCC < 3V
OR
EN > SHDN
THRESHOLD
YES
RECHARGE MODE
FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
1/2 CHARGE CYCLE
(2.25 HOURS)
Figure 2. State Diagram of LTC4065-4.4 Operation
4065 F02
406544f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC4065-4.4.PDF ] | |
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