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Linear Technology Electronic Components Datasheet

LTC4085EDE Datasheet

USB Power Manager

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LTC4085
FEATURES
USB Power Manager with
Ideal Diode Controller and
Li-Ion Charger
DESCRIPTION
n Seamless Transition Between Input Power Sources:
Li-Ion Battery, USB and 5V Wall Adapter
n 215mΩ Internal Ideal Diode Plus Optional External
Ideal Diode Controller Provide Low Loss PowerPath
When Wall Adapter/USB Input Not Present
n Load Dependent Charging Guarantees Accurate USB
Input Current Compliance
n Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate Without
Risk of Overheating*
n Selectable 100% or 20% Input Current Limit
(e.g., 500mA/100mA)
n Battery Charge Current Independently Programmable
Up to 1.2A
n Preset 4.2V Charge Voltage with 0.8% Accuracy
n C/10 Charge Current Detection Output
n NTC Thermistor Input for Temperature Qualified Charging
n Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package
APPLICATIONS
n Portable USB Devices: Cameras, MP3 Players, PDAs
The LTC®4085 is a USB power manager and Li-Ion battery
charger designed for portable battery-powered applica-
tions. 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 pro-
grammed value up to 1.5A (typically 100mA or 500mA).
Battery charge current is automatically reduced such that
the sum of the load current and charge current does not
exceed the programmed input current limit.
The LTC4085 includes a complete constant-current/
constant-voltage linear charger for single cell Li-ion bat-
teries. 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. An end-of-charge
status output CHRG indicates full charge. 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 tem-
perature while charging.
The LTC4085 is available in a 14-lead low profile 4mm ×
3mm DFN 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 6522118,6700364.
Other patents pending.
TYPICAL APPLICATION
5V WALL
ADAPTER
INPUT
5V (NOM)
FROM USB
CABLE VBUS
IIN
4.7μF SUSPEND USB POWER
100mA 500mA SELECT
10k
IN
SUSP
WALL
ACPR
HPWR
PROG
LTC4085
OUT
GATE
CLPROG
NTC
BAT
CHRG
VNTC
GND TIMER
100k 2k
10k
Input and Battery Current vs Load Current
ILOAD
TO LDOs,
REGs, ETC
4.7μF
RPROG = 100k, RCLPROG = 2k
600
IIN
500
1k
510Ω
400
ILOAD
300
*
200
IBAT
(CHARGING)
100
IBAT
+
0.1μF
* OPTIONAL - TO LOWER
IDEAL DIODE IMPEDANCE
4085 TA01
0
IBAT
WALL = 0V
(DISCHARGING)
–100
0 100 200 300 400 500 600
ILOAD (mA)
4085 TA01b
4085fd
1


Linear Technology Electronic Components Datasheet

LTC4085EDE Datasheet

USB Power Manager

No Preview Available !

LTC4085
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 s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC4085EDE#PBF
LTC4085EDE#TRPBF
4085
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/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l indicates specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VBAT = 3.7V, HPWR = 5V, WALL = 0V, RPROG = 100k,
RCLPROG = 2k, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
VIN
Input Supply Voltage
IN and OUT
4.35
5.5
VBAT
Input Voltage
BAT
4.3
IIN
IOUT
IBAT
VUVLO
VUVLO
Current Limit
Input Supply Current
IBAT = 0 (Note 7)
l
Suspend Mode; SUSP = 5V
l
Suspend Mode; SUSP = 5V, WALL = 5V, l
VOUT = 4.8V
0.5
1.2
50
100
60
110
Output Supply Current
VOUT = 5V, VIN = 0V, NTC = VNTC
l
0.7
1.4
Battery Drain Current
VBAT = 4.3V, Charging Stopped
l
Suspend Mode; SUSP = 5V
l
VIN = 0V, BAT Powers OUT, No Load
l
15
27
22
35
60
100
Input or Output Undervoltage Lockout VIN Powers Part, Rising Threshold
VOUT Powers Part, Rising Threshold
l 3.6
3.8
4
l 2.75 2.95 3.15
Input or Output Undervoltage Lockout VIN Rising – VIN Falling
130
or VOUT Rising – VOUT Falling
ILIM
IIN(MAX)
RON
Current Limit
Maximum Input Current Limit
ON Resistance VIN to VOUT
RCLPROG = 2k (0.1%), HPWR = 5V
RCLPROG = 2k (0.1%), HPWR = 0V
(Note 8)
IOUT = 100mA Load
l 475
500
525
l 90
100
110
2.4
215
2
UNITS
V
V
mA
μA
μA
mA
μA
μA
μA
V
V
mV
mA
mA
A
mΩ
4085fd


Part Number LTC4085EDE
Description USB Power Manager
Maker Linear
PDF Download

LTC4085EDE Datasheet PDF






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