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LTC4066

Description
USB Power Controller and Li-Ion Linear Charger with Low Loss Ideal Diode
File Size316KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC4066 Overview

USB Power Controller and Li-Ion Linear Charger with Low Loss Ideal Diode

FEATURES
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LTC4066/LTC4066-1
USB Power Controller and
Li-Ion Linear Charger with
Low Loss Ideal Diode
DESCRIPTION
The LTC
®
4066/LTC4066-1 are USB power managers and
Li-Ion battery chargers designed to work in portable
battery-powered applications. The parts control the total
current used by the USB peripheral for operation and
battery charging. The total input current can be limited
to 100mA, 500mA or “unlimited” (i.e., above 2A). Battery
charge current is automatically reduced such that the sum
of the load current and the charge current does not exceed
the programmed input current limit.
The LTC4066/LTC4066-1 include a standalone constant-
current/constant-voltage linear charger for single cell
Li-ion batteries. The float voltage applied to the battery
is held to a tight 0.8% tolerance, and charge current
is programmable using an external resistor to ground.
A programmable end-of-charge status output (CHRG)
indicates full charge. BAT pin charge and discharge cur-
rents can be monitored via an analog output (I
STAT
). 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 bat-
tery temperature while charging.
The LTC4066/LTC4066-1 are available in a 24-pin thin
profile (0.75mm) 4mm
×
4mm QFN package. The LTC4066
is also available in a 24-pin ultrathin profile (0.55mm)
4mm
×
4mm UTQFN package.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners. *Protected by U.S. Patents including 6522118.
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Seamless Transition Between Input Power Sources:
Li-Ion Battery, USB and 5V Wall Adapter
Low Loss (50mΩ) Ideal Diode Path from BAT to OUT
Programmable Charge Current Detection (CHRG)
Load Dependent Charging Guarantees USB Input
Current Compliance
Analog Gas Gauge Function
Charges Single Cell Li-Ion Batteries Directly from
USB Port
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating*
Selectable 100% or 20% Current Limit
(e.g., 500mA/100mA)
Termination Timer Adapts to Actual Charge Current
Preset 4.2V Charge Voltage with 0.8% Accuracy
(4.1V for LTC4066-1)
NTC Thermistor Input for Temperature Qualified
Charging
Thin Profile (0.75mm) 24-Lead 4mm
×
4mm
QFN Package
Ultrathin Profile (0.55mm) 24-Lead 4mm
×
4mm
UTQFN Package (LTC4066 Only)
APPLICATIONS
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Portable USB Devices
GPS, Cameras, Broadband Wireless Modems
Mulitple Input Chargers
TYPICAL APPLICATION
5V (NOM)
FROM USB
CABLE V
BUS
IN
4.7μF
V
NTC
NTC
WALL
SHDN
SUSPEND USB POWER
500mA/100mA SELECT
INPUT CURRENT
LIMIT DISABLE
0.1μF
SUSP
HPWR
CLDIS
TIMER PROG
CLPROG
2k
OUT
BAT
CURRENT (mA)
600
500
400
I
LOAD
300
200
100
TO ADC FOR
GAS GAUGE
0
–100
I
IN
+
510Ω
510Ω
TO LDOs,
REGs, ETC
4.7μF
LTC4066
CHRG
ACPR
POL
I
STAT
GND
2k
4066 TA01
I
BAT
CHARGING
100k
0
100
200
300
400
I
LOAD
(mA)
500
600
I
BAT
(IDEAL DIODE)
4066 TA02
4066fc
1

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LTC4066 LTC4066-1
Description USB Power Controller and Li-Ion Linear Charger with Low Loss Ideal Diode USB Power Controller and Li-Ion Linear Charger with Low Loss Ideal Diode
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