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LTC4055 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4055
Description  USB Power Controller and Li-Ion Linear Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4055 Datasheet(HTML) 1 Page - Linear Technology

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1
LTC4055
4055p
USB Power Controller
and Li-Ion Linear Charger
s
Charges Single Cell Li-Ion Batteries Directly from
USB Port
s
Load Dependent Charging Guarantees USB Input
Current Compliance
s
Automatic Battery Switchover When Input Supply
is Removed
s
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating
s
Selectable 100% or 20% Current Limit
(e.g., 500mA/100mA)
s
Low Loss Full PowerPath
TM Control with Ideal Diode
Operation (Reverse Current Blocking)
s
Preset 4.2V Charge Voltage with 0.8% Accuracy
s
USB Compliant Suspend Mode
s
Programmable Charge Current and Termination Timer
s
Automatic Recharge
s
Soft-Start Limits Inrush Current
s
NTC Thermistor Input for Temperature Qualified
Charging
s
Tiny (4mm
× 4mm × 0.8mm) QFN Package
The LTC
®4055 is a USB power manager and Li-Ion battery
charger designed to work in portable battery-powered
applications. The part manages and limits the total current
used by the USB peripheral for operation and battery
charging. Depending on the state of the current select pin
(HPWR), total input current can be limited to either 100mA
or 500mA. The voltage drop from the USB supply or
battery to the USB peripheral is typically less than 100mV
at 400mA and 20mV at 80mA. Other management features
include: automatic switch over to battery when input is
removed, inrush current limiting, reverse current block-
ing, undervoltage lockout and thermal shutdown.
The LTC4055 includes a complete constant-current/con-
stant-voltage linear charger for single cell Li-ion batteries.
The float voltage applied to the battery is held to a tight
0.8% (typ) tolerance, and charge current is programmable
using an external resistor to ground. Fully discharged cells
are automatically trickle charged at 10% of the pro-
grammed current until the cell voltage exceeds 2.8V. Total
charge time is programmable by an external capacitor to
ground. When the battery drops 100mV below the float
voltage, automatic recharging of the battery occurs. Also
featured is an NTC thermistor input used to monitor
battery temperature while charging.
The LTC4055 is available in a 16-pin low profile
(4mm
× 4mm) QFN package.
s
Portable USB Devices: Cameras, MP3 Players, PDAs
, LTC and LT are registered trademarks of Linear Technology Corporation.
PowerPath is a trademark of Linear Technology Corporation.
+
IN1
IN2
VNTC
NTC
WALL
SHDN
SUSP
HPWR
OUT
Li-Ion
CELL
10
µF
1
10
µF
TIMER PROG
LTC4055
CLPROG
GND
4055 TA01
TO LDOs,
REGs, ETC
BAT
CHRG
ACPR
0.1
µF
100k
100k
SUSPEND USB POWER
500mA/100mA SELECT
5V (NOM)
FROM USB
CABLE VBUS
ILOAD (mA)
0
300
400
600
500
IIN
400
4055 TA02
200
100
–100
0
100
200
300
600
IBAT
(IDEAL DIODE)
500
IBAT
CHARGING
ILOAD
High Power/Full Charge
RPROG = RCLPROG = 100k
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
Electrical Specifications Subject to Change


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