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Linear Technology Electronic Components Datasheet

LTC4085EDE-4 Datasheet

USB Power Manager

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LTC4085-3/LTC4085-4
FEATURES
USB Power Manager with
Ideal Diode Controller and
3.95V Li-Ion Charger
DESCRIPTION
Seamless Transition Between Input Power Sources:
Li-Ion/Polymer Battery, USB and 5V Wall Adapter
215mΩ Internal Ideal Diode Plus Optional External
Ideal Diode Controller Provide Low Loss PowerPath
When Wall Adapter/USB Input Not Present
Load Dependent Charging Guarantees Accurate
USB Input Current Compliance
3.95V Float Voltage Improves Battery Life Span and
High Temperature Safety Margin
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate without
Risk of Overheating*
Selectable 100% or 20% Input Current Limit
(e.g., 500mA/100mA)
Battery Charge Current Independently Programmable
Up to 1.2A
Automatic Output Undervoltage Charge Current
Reduction (LTC4085-3)
Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package
APPLICATIONS
Portable USB Devices
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Bat-Track, PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
6522118, 6700364. Other patents pending.
The LTC®4085-3/LTC4085-4 is a USB power manager
and Li-Ion/Polymer battery charger designed for portable
battery-powered applications. The part controls the total
current used by the USB peripheral for operation and
battery charging. The total input current can be limited to
20% or 100% of a programmed value up to 1.5A (typically
100mA or 500mA). Battery charge current is automati-
cally reduced such that the sum of the load current and
charge current does not exceed the programmed input
current limit.
The LTC4085-3/LTC4085-4 includes a complete constant-
current/constant-voltage linear charger for single cell Li-Ion
batteries. These 3.95V versions of the standard LTC4085
are intended for applications which have extended battery
lifetime requirements or those that require high temperature
(approximately >60°C) operation or storage. Under these
conditions, a reduced float voltage will trade-off initial cell
capacity for the benefit of increased capacity retention
over the life of the battery. A reduced float voltage also
minimizes swelling in prismatic and polymer cells, and
avoids open CID (pressure fuse) in cylindrical cells.
The LTC4085-3/LTC4085-4 also includes a programmable
termination timer, automatic recharging, an end-of-charge
status output and an NTC thermistor.
TYPICAL APPLICATION
5V WALL
ADAPTER
INPUT
5V (NOM)
FROM USB
CABLE VBUS
IIN
4.7μF SUSPEND USB POWER
100mA 500mA SELECT
IN
SUSP
WALL
ACPR
HPWR
OUT
LTC4085-3/
PROG LTC4085-4 GATE
CLPROG
BAT
NTC
CHRG
VNTC
10k
GND TIMER
100k 2k
10k
ILOAD
TO LDOs,
REGs, ETC
1k
4.7μF
510Ω
*
IBAT
+
0.1μF
* OPTIONAL - TO LOWER
IDEAL DIODE IMPEDANCE
408534 TA01
Input and Battery Current vs Load Current
RPROG = 100k, RCLPROG = 2k
600
IIN
500
400
ILOAD
300
200
IBAT
(CHARGING)
100
0
IBAT
WALL = 0V
(DISCHARGING)
–100
0 100 200 300 400 500 600
ILOAD (mA)
408534 TA01b
408534fb
1


Linear Technology Electronic Components Datasheet

LTC4085EDE-4 Datasheet

USB Power Manager

No Preview Available !

LTC4085-3/LTC4085-4
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2, 3, 4, 5)
Terminal Voltage
IN, OUT
t < 1ms and Duty Cycle < 1%................... –0.3V to 7V
Steady State............................................. –0.3V to 6V
BAT, CHRG, HPWR, SUSP, WALL, ACPR....... –0.3V to 6V
NTC, TIMER, PROG, CLPROG.......–0.3V to (VCC + 0.3V)
Pin Current (Steady State)
IN, OUT, BAT (Note 6)...............................................2.5A
Operating Temperature Range.................. –40°C to 85°C
Maximum Operating Junction Temperature .......... 110°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
IN 1
OUT 2
CLPROG 3
HPWR 4
SUSP 5
TIMER 6
WALL 7
14 BAT
13 GATE
12 PROG
15
11 CHRG
10 ACPR
9 VNTC
8 NTC
DE PACKAGE
14-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE CONNECTED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC4085EDE-3#PBF LTC4085EDE-3#TRPBF 40853
14-Lead (4mm × 3mm) Plastic DFN
LTC4085EDE-4#PBF LTC4085EDE-4#TRPBF 40854
14-Lead (4mm × 3mm) Plastic DFN
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/
LTC4085 Options
PART NUMBER
FLOAT VOLTAGE
NTC HOT THRESHOLD
UNDERVOLTAGE CURRENT LIMIT*
LTC4085
4.2V
29% VVNTC
Yes
LTC4085-1
4.1V
32.6% VVNTC
Yes
LTC4085-3
3.95V
32.6% VVNTC
Yes
LTC4085-4
3.95V
32.6% VVNTC
No
*Undervoltage current limit reduces charge current as VOUT falls below approximately 4.45V.
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The indicates specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C (Note 5). VIN = 5V, VBAT = 3.7V, HPWR = 5V, WALL = 0V, RPROG = 100k,
RCLPROG = 2k, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN
Input Supply Voltage
VBAT
Input Voltage
IIN
Input Supply Current
IOUT
Output Supply Current
IBAT
Battery Drain Current
IN and OUT
4.35
5.5
V
BAT
4.3
V
IBAT = 0 (Note 7)
Suspend Mode; SUSP = 5V
Suspend Mode; SUSP = 5V, WALL = 5V,
VOUT = 4.8V
VOUT = 5V, VIN = 0V, NTC = VNTC
VBAT = 4.05V, Charging Stopped
Suspend Mode; SUSP = 5V
VIN = 0V, BAT Powers OUT, No Load
0.5
1.2
mA
50
100
μA
60
110
μA
0.7
1.4
mA
15
27
μA
22
35
μA
60
100
μA
408534fb
2


Part Number LTC4085EDE-4
Description USB Power Manager
Maker Linear
PDF Download

LTC4085EDE-4 Datasheet PDF






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