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Linear Technology Electronic Components Datasheet

LTC4055-1 Datasheet

USB Power Controller and Li-Ion Linear Charger

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LTC4055/LTC4055-1
USB Power Controller
and Li-Ion Charger
FEATURES
DESCRIPTION
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 PowerPathControl 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 Qualified
Charging
n Tiny (4mm × 4mm × 0.75mm) QFN Package
APPLICATIONS
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.
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 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. 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 float 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
profile (4mm × 4mm) QFN package.
TYPICAL APPLICATION
5V (NOM)
FROM USB
CABLE VBUS
10μF
SUSPEND USB POWER
500mA/100mA SELECT
IN1
IN2
VNTC
NTC
WALL
LTC4055
SHDN
SUSP
HPWR
TIMER PROG CLPROG
OUT
BAT +
CHRG
ACPR
GND
Li-Ion
CELL
0.1μF
97.6k 97.6k
4055 TA01
TO SYSTEM
LOADS
10μF
Input and Battery Current vs Load Current
RPROG = RCLPROG = 97.6k
600
500 IIN
400
ILOAD
300
200
IBAT
CHARGING
100
0
–100
0
IBAT
(IDEAL DIODE)
100 200 300 400 500 600
ILOAD (mA)
4055 TA02
4055fb
1


Linear Technology Electronic Components Datasheet

LTC4055-1 Datasheet

USB Power Controller and Li-Ion Linear Charger

No Preview Available !

LTC4055/LTC4055-1
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2, 3, 4, 5)
Terminal Voltage
IN1, IN2, OUT, BAT.................................. –0.3V to 6V
NTC, VNTC, TIMER,
PROG, CLPROG..................... –0.3V to (VCC + 0.3V)
CHRG, HPWR, SUSP, SHDN,
WALL, ACPR........................................... –0.3V to 6V
IN2........................................................... VIN1 + 0.1V
Pin Current (DC)
IN1, IN2, OUT, BAT (Note 7) ............................... 1.6A
Operating Temperature Range................. –40°C to 85°C
Maximum Operating Junction Temperature ......... 125°C
Storage Temperature Range.................. –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
16 15 14 13
IN2 1
12 TIMER
BAT 2
11 PROG
17
OUT 3
10 GND
IN1 4
9 CLPROG
5678
UF PACKAGE
16-LEAD (4mm s 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC4055EUF#PBF
LTC4055EUF#TRPBF
4055
16-Lead (4mm × 4mm) Plastic QFN
LTC4055EUF-1#PBF
LTC4055EUF-1#TRPBF 40551
16-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN1 = VIN2 = 5V, VBAT = 3.5V, HPWR = 5V, WALL = 0V,
RPROG = RCLPROG = 100k, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
VIN Input Supply Voltage
VBAT Input Voltage
IIN Input Supply Current
IN1, IN2 and OUT
BAT
VBAT = 4.2V
Suspend Mode
Suspend Mode, Wall = 2V, VOUT = 4.8V
Shutdown
l 4.35
l
l
l
l
l
0.8
50
0.1
10
5.5
4.3
1.6
100
0.2
20
IOUT Output Supply Current
IBAT Battery Drain Current
ILIM(MAX)
Maximum Current Limit
VOUT = 5V, VIN1 = VIN2 = 0V, VBAT = 4.2V
VBAT = 4.2V, Charging Stopped
Suspend Mode
Shutdown
VIN1 = VIN2 = 0V, BAT Powers OUT, No Load
(Note 8)
l
l
l
l
l
450 900
15 30
15 30
2.5 5
50 100
1
VUVLO
ΔVUVLO
Input or Output Undervoltage Lockout
Input or Output Undervoltage Lockout
Hysteresis
VIN Powers Part, Rising Threshold
VOUT Powers Part, Rising Threshold
VIN Rising – VIN Falling or
VOUT Rising – VOUT Falling
l 3.5
l 3.5
3.8
3.8
125
4
4
UNITS
V
V
mA
μA
mA
μA
μA
μA
μA
μA
μA
A
V
V
mV
4055fb
2


Part Number LTC4055-1
Description USB Power Controller and Li-Ion Linear Charger
Maker Linear
Total Page 24 Pages
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