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LTC4088-1 Fiches technique(PDF) 1 Page - Linear Technology

No de pièce LTC4088-1
Description  High Effi ciency Battery Charger/USB Power Manager with Regulated Output Voltage
Download  24 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LTC4088-1 Fiches technique(HTML) 1 Page - Linear Technology

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LTC4088-1/LTC4088-2
1
40881fb
High Efficiency Battery
Charger/USB Power Manager
with Regulated Output Voltage
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.
n Media Players
n Digital Cameras
n GPS
n PDAs
n Smart Phones
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
High Efficiency Battery Charger/USB Power Manager
APPLICATIO S
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
, 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
Switching Regulator Efficiency to
System Load (POUT/PBUS)
IOUT (A)
0.01
0
20
40
60
80
0.1
1
408812 TA01b
100
10
30
50
70
90
BAT = 4.2V
BAT = 3.3V
VBUS = 5V
IBAT = 0mA
10x MODE
VBUS
VOUT
10µF
WALL
USB
0.1µF
10µF
SYSTEM
LOAD
2.94k
499Ω
408812 TA01a
CLPROG
8.2Ω
PROG
LTC4088-1/LTC4088-2
C/X GND
SW
3.3µH
NTC
D0
D1
D2
CHRG
VOUTS
GATE
BAT
+
Li-Ion


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