LTC4075 LINER [Linear Technology], LTC4075 Datasheet

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LTC4075

Manufacturer Part Number
LTC4075
Description
Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers
Manufacturer
LINER [Linear Technology]
Datasheet
FEATURES
Charges Single-Cell Li-Ion Batteries from Wall
Adapter and USB Inputs
Automatic Input Power Detection and Selection
Charge Current Programmable up to 950mA from
Wall Adapter Input
No External MOSFET, Sense Resistor or Blocking
Diode Needed
Thermal Regulation Maximizes Charging Rate
Without Risk of Overheating*
Preset Charge Voltage with ±0.6% Accuracy
Programmable Charge Current Termination
18µA USB Suspend Current in Shutdown
Independent “Power Present” Status Outputs
Charge Status Output
Automatic Recharge
Available Without Trickle Charge (LTC4075X)
Available in a Thermally Enhanced, Low Profi le
(0.75mm) 10-Lead (3mm × 3mm) DFN Package
U
APPLICATIO S
Cellular Telephones
Handheld Computers
Portable MP3 Players
Digital Cameras
U
TYPICAL APPLICATIO
Dual Input Battery Charger for Single-Cell Li-Ion
LTC4075
WALL
ADAPTER
DCIN
BAT
USB
USBIN
PORT
1µF
IUSB
2k
IDC
ITERM
1µF
1%
1.24k
GND
1%
Adapter Standalone Li-Ion
DESCRIPTIO
The LTC
®
4075/LTC4075X are standalone linear chargers
that are capable of charging a single-cell Li-Ion battery
from both wall adapter and USB inputs. The chargers can
detect power at the inputs and automatically select the
appropriate power source for charging.
No external sense resistor or blocking diode is required
for charging due to the internal MOSFET architecture.
Internal thermal feedback regulates the battery charge
current to maintain a constant die temperature during high
power operation or high ambient temperature conditions.
The fl oat voltage is fi xed at 4.2V and the charge current
is programmed with an external resistor. The LTC4075
terminates the charge cycle when the charge current drops
below the programmed termination threshold after the
fi nal fl oat voltage is reached. With power applied to both
inputs, the LTC4075/LTC4075X can be put into shutdown
mode reducing the DCIN supply current to 20µA, the USBIN
supply current to 10µA, and the battery drain current to
less than 2µA.
Other features include automatic recharge, undervoltage
lockout, charge status outputs, and “power present”
status outputs to indicate the presence of wall adapter
or USB power.
, LTC and LT 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
Complete Charge Cycle (1100mAh Battery)
1000
800
600
400
200
800mA (WALL)
0
500mA (USB)
4.2
4.0
+
3.8
4.2V
SINGLE CELL
3.6
Li-Ion BATTERY
3.4
5.0
2k
2.5
1%
0
–2.5
4075 TA01
LTC4075/LTC4075X
Dual Input USB/AC
Battery Chargers
U
CONSTANT VOLTAGE
USBIN = 5V
T
= 25°C
A
R
= 1.25k
IDC
R
= 2k
IUSB
0
0.5
1.0
1.5
2.0
2.5
3.0
TIME (HR)
4075 TA01b
4075Xf
1

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LTC4075 Summary of contents

Page 1

... With power applied to both inputs, the LTC4075/LTC4075X can be put into shutdown mode reducing the DCIN supply current to 20µA, the USBIN supply current to 10µA, and the battery drain current to less than 2µ ...

Page 2

... 2.1k BAT TRIKL IUSB V Rising BAT Hysteresis From Low to High Hysteresis From Low to High Hysteresis ORDER PART NUMBER 10 DCIN LTC4075EDD 9 BAT LTC4075XEDD 8 IDC 7 USBPWR 6 ENABLE DD PART MARKING LBSC LBRK MIN TYP MAX UNITS ● 4.3 8 ● 4.3 8 ● 250 800 µA ● ...

Page 3

... Note 5: Supply current includes IUSB and ITERM pin current (approximately 100µA each) but does not include any current delivered to the battery through the BAT pin. Note 6: This parameter is not applicable to the LTC4075X. Note 7: Guaranteed by long term current density limitations. MIN ...

Page 4

... LTC4075/LTC4075X W U TYPICAL PERFOR A CE CHARACTERISTICS Regulated Output (Float) Voltage vs Charge Current 4. DCIN USBIN 4.24 4.22 4.20 4.18 4. 1.25k IDC IDC IUSB 4.14 4.12 4.10 0 100 200 300 400 500 600 700 800 CHARGE CURRENT (mA) 4075X G01 IUSB Pin Voltage vs Temperature (Constant-Current Mode) 1.008 1.006 1.004 1 ...

Page 5

... ENABLE = 0V 0 –50 – 100 TEMPERATURE (°C) 4075X G17 LTC4075/LTC4075X Charge Current vs Battery Voltage 1000 LTC4075X 800 600 400 200 DCIN USBIN LTC4075 θ = 40°C 1.25k IDC 0 2.4 2.7 3.0 3.3 3.6 3.9 4.2 V (V) BAT 4075X G12 ENABLE Pin Threshold (On-to-Off) vs Temperature 900 ...

Page 6

... LTC4075/LTC4075X W U TYPICAL PERFOR A CE CHARACTERISTICS Undervoltage Lockout Threshold vs Temperature 4.30 4.25 DCIN UVLO 4.20 4.15 4.10 4.05 USBIN UVLO 4.00 3.95 3.90 –50 – TEMPERATURE (°C) Battery Drain Current vs Temperature 4.2V BAT (NOT CONNECTED) DCIN USBIN –1 –50 – TEMPERATURE (°C) 6 Recharge Threshold vs Temperature 4 ...

Page 7

... LED. ⎯ C ⎯ H ⎯ R ⎯ G (Pin 5): Open-Drain Charge Status Output. When the LTC4075 is charging, the ⎯ C ⎯ H ⎯ R ⎯ G pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, ⎯ C ⎯ H ⎯ R ⎯ G becomes high impedance. This output is capable of sinking up to 10mA, making it suitable for driving an LED ...

Page 8

... LTC4075/LTC4075X W BLOCK DIAGRA DCIN 1mA MAX 7 USBPWR 10mA MAX 4 PWR 10mA MAX CHRG 5 LOGIC RECHRG TRICKLE TERM 6 ENABLE R ENABLE TERMINATION *TRICKLE CHARGE DISABLED ON THE LTC4075X 8 10 CC/CV REGULATOR + DC – 4.15V SOFT-START DCIN UVLO + – BAT + 4.1V RECHARGE – BAT DC_ENABLE – *TRICKLE CHARGER CONTROL CHARGE 2 ...

Page 9

... Power Source Selection The LTC4075 can charge a battery from either the wall adapter input or the USB port input. The LTC4075 automati- cally senses the presence of voltage at each input. If both power sources are present, the LTC4075 defaults to the wall adapter source provided suffi ...

Page 10

... This ensures that the battery is kept at, or near, a fully charged condi- *Any external sources that hold the ITERM pin above 100mV will prevent the LTC4075 from terminating a charge cycle. 10 tion and eliminates the need for periodic charge cycle initiations ...

Page 11

... LED power is applied at either pin, the ⎯ P ⎯ W ⎯ R pin is high impedance, indicating that the LTC4075 lacks suffi cient power to charge the battery. The pull-down state is capable of sinking up to 10mA. The USB power status output (USBPWR) has two states: pull-down and high impedance ...

Page 12

... BAT because the LTC4075 automatically reduces the charge + current during high power conditions. The conditions ITERM that cause the LTC4075 to reduce charge current through R ITERM 1k thermal feedback can be approximated by considering the 1% power dissipated in the IC. Most of the power dissipation 4075 F03 is generated from the internal charger MOSFET ...

Page 13

... V ) • BAT BAT Example: An LTC4075 operating from a 5V wall adapter (on the DCIN input) is programmed to supply 800mA full-scale current to a discharged Li-Ion battery with a voltage of 3.3V. Assuming θ is 40°C/W (see Thermal Considerations), JA the ambient temperature at which the LTC4075 will begin ...

Page 14

... In other cases where the voltage drop must be kept low, a P-channel MOSFET can be used (as shown in Figure 5). 3455 F04 Figure 5. Low Loss Input Reverse Polarity Protection DRAIN-BULK DIODE OF FET LTC4075 WALL DCIN ADAPTER 4075 F05 4075Xf ...

Page 15

... ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE LTC4075/LTC4075X R = 0.115 0.38 ± 0.10 TYP 6 10 3.00 ± ...

Page 16

... LTC4411/LTC4412 Low Loss PowerPath ThinSOT and PowerPath are trademarks of Linear Technology Corporation Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● Full Featured Li-Ion Charger LTC4075 DCIN BAT USBIN 1k 1µF 1µF PWR IUSB CHRG IDC ITERM 1 ...

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