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PDF LTC4062 Data sheet ( Hoja de datos )
| Número de pieza | LTC4062 | |
| Descripción | Standalone Linear Li-Ion Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Charge Current Programmable up to 1A
■ Charges Single Cell Li-Ion Batteries Directly from
USB Port
■ Preset Float Voltage with ±0.35% Accuracy
■ Micropower Comparator for Battery Monitoring
■ Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
■ Programmable Charge Current Detection/
Termination
■ Programmable Charge Termination Timer
■ Smart Pulsing Error Feature
■ SmartStartTM Prolongs Battery Life
■ 20µA Charger Quiescent Current in Shutdown
■ Available in a Low Profile (0.75mm) 10-Lead
(3mm × 3mm) DFN Package
U
APPLICATIO S
■ Handheld Computers
■ Portable MP3 Players
■ Digital Cameras
, LTC and LT are registered trademarks of Linear Technology Corporation.
SmartStart is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents, including 6522118.
LTC4062
Standalone Linear Li-Ion
Battery Charger with
Micropower Comparator
DESCRIPTIO
The LTC®4062 is a full-featured, flexible, standalone linear
charger for single-cell Lithium-Ion batteries. It is capable
of operating within USB power specifications.
Both programmable time and programmable current based
termination schemes are available. Furthermore, the CHRG
open-drain status pin can be programmed to indicate the
battery charge state according to the needs of the applica-
tion. A precise low power comparator is available even
with no power applied as long as battery voltage is higher
than 2.5V. Additional safety features designed to maxi-
mize battery lifetime and reliability include the SmartStart
charging algorithm.
No external sense resistor or external blocking diode is
required for charging due to the internal MOSFET architec-
ture. Internal thermal feedback regulates the charge cur-
rent to maintain a constant die temperature during high
power operation or high ambient temperature conditions.
The charge current is programmed with an external resis-
tor. With power applied, the LTC4062 can be put into
shutdown mode to reduce the supply current to 20µA and
the battery drain current to less than 2µA. Without power
applied, the internal low power comparator can work
sinking only 10µA from the battery.
Other features include smart recharge, USB C/5 current
programming input and undervoltage lockout.
TYPICAL APPLICATIO
800mA Single Cell Li-Ion Battery Charger
(C/10 Termination)
VIN
4.3V TO 8V
VCC OUT
LTC4062
EN
C/5
TIMER
BAT
1µF PROG
IDET IN+
619Ω
GND
BAT > 3V BAT < 3V
100k
800mA
715k
+ SINGLE CELL
347k Li-Ion BATTERY
4062 TA01
Complete Charge Cycle (1100mAh Battery)
900 4.3
800 4.2
700 4.1
600 4.0
500
400
BATTERY
VOLTAGE
300
BATTERY
CURRENT
3.9
3.8
3.7
200
100 VCC = 5V
TA = 25°C
0
0 0.5 1.0 1.5 2.0
TIME (HOURS)
3.6
3.5
3.4
2.5 3.0
4062 TA01b
4062f
1
1 page  
LTC4062
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted
Internal Charge Timer vs
Temperature
195
190
VCC = 4.3V
185
VCC = 8V
180
175
170
165
–50 –25 0
CTIMER = 0.1µF
25 50 75 100
TEMPERATURE (°C)
4062 G10
Recharge Threshold Voltage vs
Temperature
4.16
4.14
4.12
VCC = 8V
4.10
VCC = 4.3V
4.08
4.06
4.04
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
4062 G15
Charge Current vs Battery Voltage
900
VCC = 5V
800 C/5 = 5V
700
RPROG = 1.25k
θJA = 40°C/W
600
500
400
300
200
100
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VBAT (V)
4062 G18
Charge Current vs Ambient
Temperature with Thermal
Regulation
1000
ONSET OF THERMAL
REGULATION
800
RPROG = 1.25k
600
RPROG = 2k
400
200 VCC = 5V
VBAT = 4V
θJA = 40°C/W
0
–50 –25 0 25 50
75
TEMPERATURE (°C)
100 125
4062 G13
Power FET “ON” Resistance vs
Temperature
500
VCC = 4V
IBAT = 200mA
450
400
350
300
250
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
4062 G16
EN Pin Pulldown Resistance vs
Temperature
5.0
4.5
4.0
3.5
3.0
2.5
2.0
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
4062 G19
Charge Current vs Supply Voltage
104 VCC = 5V
VBAT = 4V
C/5 = 5V
102 RPROG = 10k
100
98
96
4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
VCC (V)
4062 G14
Undervoltage Lockout Voltage vs
Temperature
3.900
3.875
3.850
3.825
3.800
3.775
3.750
3.725
3.700
– 50 –25
0 25 50
TEMPERATURE (°C)
75 100
4062 G17
C/5 Pin Pulldown Resistance vs
Temperature
5.0
4.5
4.0
3.5
3.0
2.5
2.0
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
4062 G20
4062f
5
5 Page 
LTC4062
OPERATIO
Smart Pulsing Error Feature
LTC4062 has a pulsing state at the CHRG pull-down pin of
6Hz (50% duty cycle) due to defective battery detection
(see Trickle-Charge and Defective Battery Detection sec-
tion).
Low Power Comparator (IN+; OUT)
The low power, low offset comparator is designed with an
internal 1V reference connected to the negative input. This
reference is generated by a precise bandgap circuit. The
comparator output drives a pull down NMOS transistor
able to sink up to 10mA. Voltages lower than 1V at the IN+
pin set the OUT pin to a high impedance state.
Voltages higher than 1V plus a built-in 50mV hysteresis at
the IN+ pin set the OUT pin to a low impedance state. The
comparator is operational even when VCC is not applied
provided the BAT pin voltage is greater than 2.5V. When
the voltage at the BAT pin drops below 2.5V, the compara-
tor shuts down and the current at the BAT pin is reduced
to <1µA.
IN+
2
+
4
OUT
1V
LTC4062
–
4062 F01
Figure 1. Low Power Comparator Circuit
4062f
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC4062.PDF ] | |
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