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Linear Technology Electronic Components Datasheet

LTC4088-2 Datasheet

High Efficiency Battery Charger/USB Power Manager

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LTC4088-2 pdf
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LTC4088-1/LTC4088-2
High Efficiency Battery
Charger/USB Power Manager
with Regulated Output Voltage
FEATURES
n Switching Regulator Makes Optimal Use of Limited
Power Available from USB Port to Charge Battery
and Power Application
n 180mΩ Internal Ideal Diode Plus External Ideal Diode
Controller Seamlessly Provide Low Loss Power Path
When Input Power is Limited or Unavailable
n Automatic Charge Current Reduction Maintains
3.6V Minimum VOUT
n Full Featured Li-Ion/Polymer Battery Charger
n VBUS Operating Range: 4.25V to 5.5V (7V Absolute
Maximum—Transient)
n 1.2A Maximum Input Current Limit
n 1.5A Maximum Charge Current with Thermal Limiting
n Bat-TrackTM Adaptive Output Control
n Slew Control Reduces Switching EMI
n Low Profile (0.75mm)14-Lead 4mm× 3mm DFN Package
U
APPLICATIO S
n Media Players
n Digital Cameras
n GPS
n PDAs
n Smart Phones
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
PowerPath and Bat-Track are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118
DESCRIPTIO
The LTC®4088-1/LTC4088-2 is a high efficiency USB
PowerPathTM controller and Li-Ion/Polymer battery
charger. It includes a synchronous switching input regu-
lator, a full-featured battery charger and an ideal diode.
Designed specifically for USB applications, the
LTC4088-1/LTC4088-2’s switching regulator auto-
matically limits its input current to either 100mA, 500mA
or 1A via logic control. The LTC4088-1 powers-up with the
charger off; the LTC4088-2 powers-up with the charger on.
The switching input stage provides power to VOUT where
power sharing between the application circuit and the
battery charger is managed. Charge current is automati-
cally reduced to maintain a regulated 3.6V VOUT during
low-battery conditions. As the battery is charged, VOUT
tracks VBAT for high efficiency charging. This feature al-
lows the LTC4088-1/LTC4088-2 to provide more power to
the application and eases thermal issues in constrained
applications.
An ideal diode ensures that system power is available
from the battery when the input current limit is reached
or if the USB or wall supply is removed.
The LTC4088-1/LTC4088-2 is available in the low profile
14-Lead 4mm × 3mm × 0.75mm DFN surface mount
package.
TYPICAL APPLICATIO
High Efficiency Battery Charger/USB Power Manager
WALL
USB
10µF
3.3µH
VBUS
D0
D1
D2
SW VOUT
VOUTS
LTC4088-1/LTC4088-2 GATE
CHRG
BAT
CLPROG PROG C/X GND NTC
8.2Ω
0.1µF
2.94k
499Ω
+
Li-Ion
SYSTEM
LOAD
10µF
408812 TA01a
Switching Regulator Efficiency to
System Load (POUT/PBUS)
100
90
80
70 BAT = 4.2V
60
BAT = 3.3V
50
40
30
20
10
0
0.01
VBUS = 5V
IBAT = 0mA
10x MODE
0.1
IOUT (A)
1
408812 TA01b
40881fb
1


Linear Technology Electronic Components Datasheet

LTC4088-2 Datasheet

High Efficiency Battery Charger/USB Power Manager

No Preview Available !

LTC4088-2 pdf
wwwL.DTataCShe4et40U.c8om8-1/LTC4088-2
ABSOLUTE AXI U RATI GS
(Note 1)
VBUS (Transient) t < 1ms, Duty Cycle < 1% .. –0.3V to 7V
VBUS (Static), BAT, CHRG, NTC, D0,
D1, D2.......................................................... –0.3V to 6V
ICLPROG ....................................................................3mA
IPROG, IC/X ................................................................2mA
ICHRG......................................................................75mA
IOUT ............................................................................. 2A
ISW ..............................................................................2A
IBAT .............................................................................2A
Maximum Operating Junction Temperature .......... 125°C
Operating Temperature Range.................. –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
NTC 1
14 D1
CLPROG 2
13 D0
VOUTS 3
12 SW
D2 4
15 11 VBUS
C/X 5
10 VOUT
PROG 6
9 BAT
CHRG 7
8 GATE
DE PACKAGE
14-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 37°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
LTC4088EDE-1#PBF LTC4088EDE-1#TRPBF 40881
14-Lead (4mm × 3mm × 0.75mm) Plastic DFN
LTC4088EDE-2#PBF LTC4088EDE-2#TRPBF 40882
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
–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. VBUS = 5V, BAT = 3.8V, RCLPROG = 2.94k, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Power Supply
VBUS
IBUS(LIM)
Input Supply Voltage
Total Input Current
1x Mode
5x Mode
10x Mode
Low Power Suspend Mode
High Power Suspend Mode
l 4.35
l 92
l 445
l 815
l 0.32
l 1.6
5.5
97 100
470 500
877 1000
0.39 0.5
2.05 2.5
V
mA
mA
mA
mA
mA
IBUSQ (Note 4) Input Quiescent Current
1x Mode
5x Mode
10x Mode
Low Power Suspend Mode
High Power Suspend Mode
6
14
14
0.038
0.038
mA
mA
mA
mA
mA
hCLPROG (Note 4) Ratio of Measured VBUS Current to
CLPROG Program Current
1x Mode
5x Mode
10x Mode
Low Power Suspend Mode
High Power Suspend Mode
224 mA/mA
1133 mA/mA
2140 mA/mA
11.3 mA/mA
59.4 mA/mA
40881fb
2


Part Number LTC4088-2
Description High Efficiency Battery Charger/USB Power Manager
Maker Linear Technology
Total Page 24 Pages
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LTC4088-2 pdf
LTC4088-2 Datasheet PDF
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