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PDF LTC4069 Data sheet ( Hoja de datos )
| Número de pieza | LTC4069 | |
| Descripción | Standalone 750mA Li-Ion Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4069www.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 4.2V 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 is a complete constant-current/constant-
voltage linear charger for single-cell lithium-ion batteries.
The 2mm × 2mm DFN package and low external component
count make the LTC4069 especially well-suited for portable
applications. Furthermore, LTC4069 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 automatically enters a low current
state, dropping battery drain current to less than 1μA. With
power applied, LTC4069 can be put into shutdown mode,
reducing the supply current to less than 20μA.
The LTC4069 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 is available in a tiny 6-lead, low profile
(0.75mm) 2mm × 2mm DFN package.
TYPICAL APPLICATION
Standalone Li-Ion Battery Charger
VIN
4.3V TO 5.5V
RNOM
100k
R1
510Ω
RNTC
100k
1μF
VCC BAT
LTC4069
CHRG PROG
NTC GND
500mA
+
RPROG
2k
4.2V
Li-Ion
BATTERY
4069 TA01
Complete Charge Cycle (1000mAh Battery)
600
CONSTANT
500 CURRENT
CONSTANT
VOLTAGE
4.50
4.25
400
CHRG
4.00
TRANSITION
300 3.75
200 CHARGE
TERMINATION
100
VCC = 5V
0 RPROG = 2k
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
TIME (HOURS)
3.50
3.25
3.00
5
4069 TA01b
4069fb
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC4069www.DataSheet4U.com
Undervoltage Lockout Threshold
Voltage vs Temperature
4.00
3.75
RISE
3.50
Trickle Charge Current
vs Supply Voltage
60
VBAT = 2V
TA = 25°C
50
RPROG = 2k
40
Trickle Charge Current
vs Temperature
60
VCC = 5V
VBAT = 2V
50
RPROG = 2k
40
3.25
FALL
3.00
2.75
30
20
RPROG = 10k
10
30
20
RPROG = 10k
10
2.50
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
4069 G16
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
4069 G10
0
4 4.5 5 5.5 6
SUPPLY VOLTAGE (V)
4069 G14
0
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
4069 G15
Timer Accuracy vs Temperature
1
VCC = 5V
0
–1
–2
–3
–4
–5
–6
–7
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
4069 G18
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
4069 G19
PROG Pin Shutdown Voltage
Threshold vs Temperature
5.0
VCC = 5V
4.5
PROG Pin Shutdown Voltage
vs Supply Voltage
5.0 TA = 25°C
4.5
4.0
4.0 3.5
3.0
3.5
2.5
3.0
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
4069 G20
2.0
4
4.5 5 5.5
SUPPLY VOLTAGE (V)
6
4069 G21
4069fb
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5 Page 
OPERATION
VCC
RNOM
0.76 • VCC
NTC
6
RNTC
0.35 • VCC
0.016 • VCC
–
+
–
+
+
–
TOO COLD
TOO HOT
NTC_ENABLE
LTC4069www.DataSheet4U.com
Figure 3. NTC Circuit Information
4069 F03
APPLICATIONS INFORMATION
Undervoltage Charge Current Limiting (UVCL)
The LTC4069 includes undervoltage charge (ΔVUVCL1)
current limiting that prevents full charge current until the
input supply voltage exceeds approximately 200mV above
the battery voltage. This feature is particularly useful if the
LTC4069 is powered from a supply with long leads (or any
relatively high output impedance).
For example, USB-powered systems tend to have highly
variable source impedances (due primarily to cable
quality and length). A transient load combined with such
impedance can easily trip the UVLO threshold and turn the
charger off unless undervoltage charge current limiting
is implemented.
Consider a situation where the LTC4069 is operating under
normal conditions and the input supply voltage begins to
droop (e.g., an external load drags the input supply down).
If the input voltage reaches VBAT + ΔVUVCL1 (approximately
220mV above the battery voltage), undervoltage charge
current limiting will begin to reduce the charge current
in an attempt to maintain ΔVUVCL1 between the VCC input
and the BAT output of the IC. The LTC4069 will continue
to operate at the reduced charge current until the input
supply voltage is increased or constant voltage mode
reduces the charge current further.
Operation from Current Limited Wall Adapter
By using a current limited wall adapter as the input supply,
the LTC4069 dissipates significantly less power when
programmed for a current higher than the limit of the
supply as compared to using a non-current limited supply
at the same charge current.
Consider a situation where an application demands a
600mA charge current for an 800mAh Li-Ion battery. If a
typical 5V (non-current limited) input supply is used, the
charger’s peak power dissipation can exceed 1W.
Now consider the same scenario, but with a 5V input
supply with a 600mA current limit. To take advantage of
the current limited supply, it is necessary to program the
LTC4069 to charge at a current above 600mA. Assume
that the LTC4069 is programmed for 750mA (i.e.,
RPROG = 1.33k) to ensure that part tolerances maintain
a programmed current higher than 600mA. Since the
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC4069.PDF ] | |
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