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參數資料
| 型號： | LTC4055EUF#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | USB Power Controller and Li-Ion Linear Charger; Package: QFN; No of Pins: 16; Temperature Range: -40°C to +125°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | 4 X 4 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WGGC, QFN-16 |
| 文件頁數： | 1/24頁 |
| 文件大?。?/td> | 292K |
| 代理商： | LTC4055EUF#PBF |
LTC4055/LTC4055-1
1
4055fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
USB Power Controller
and Li-Ion Charger
n Portable USB Devices: Cameras, MP3 Players, PDAs
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. Patent, including 6522118.
Input and Battery Current vs Load Current
RPROG = RCLPROG = 97.6k
n Charges Single-Cell Li-Ion Batteries Directly from
USB Port
n Load Dependent Charging Guarantees USB Input
Current Compliance
n Automatic Battery Switchover When Input Supply is
Removed
n Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating*
n Selectable 500mA/100mA Current Limit
n Low Loss Full PowerPath Control with Ideal Diode
Operation (Reverse Current Blocking)
n Preset 4.2V Charge Voltage with 0.8% Accuracy
(4.1V for LTC4055-1)
n 4.1V Float Voltage (LTC4055-1) Improves Battery Life
and High Temperature Safety Margin
n USB-Compliant Suspend Mode
n Programmable Charge Current and Termination Timer
n Soft-Start Limits Inrush Current
n NTC Thermistor Input for Temperature Qualied
Charging
n Tiny (4mm × 4mm × 0.75mm) QFN Package
The LTC
4055/LTC4055-1 are USB power manager and
Li-Ion battery chargers designed to work in portable
battery-powered applications. The parts manage and limit
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 switchover to battery when
input is removed, inrush current limiting, reverse current
blocking, undervoltage lockout and thermal shutdown.
The LTC4055/LTC4055-1 include a complete constant-
current/constant-voltage linear charger for single-cell
Li-ion batteries. The oat voltage applied to the battery
is held to a tight 0.8% tolerance, and charge current is
programmable using an external resistor to ground. Fully
discharged cells are automatically trickle charged at 10%
of the programmed 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 oat voltage, automatic recharging of the battery
occurs. Also featured is an NTC thermistor input used to
monitor battery temperature while charging.
The LTC4055/LTC4055-1 are available in a 16-pin low
prole (4mm × 4mm) QFN package.
ILOAD (mA)
0
CURRENT
(mA) 300
400
600
500
IIN
400
4055 TA02
200
100
–100
0
100
200
300
600
500
IBAT
CHARGING
ILOAD
IBAT
(IDEAL DIODE)
+
IN1
IN2
VNTC
NTC
WALL
SHDN
SUSP
HPWR
OUT
Li-Ion
CELL
10μF
1Ω
10μF
TIMER PROG
LTC4055
CLPROG
GND
4055 TA01
TO SYSTEM
LOADS
BAT
CHRG
ACPR
0.1μF
97.6k
SUSPEND USB POWER
500mA/100mA SELECT
5V (NOM)
FROM USB
CABLE VBUS
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