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LTC3414 Datasheet

  • LTC3414

  • Dual DC/DC Converter with USB Power Manager and Li-Ion Batte...

  • 24頁

  • LINER

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FEATURES
s
s
s
s
LTC3455
Dual DC/DC Converter
with USB Power Manager
and Li-Ion Battery Charger
DESCRIPTIO
The LTC
廬
3455 is a complete power management solution
for a variety of portable applications. The device contains
two synchronous step-down DC/DC converters, a USB
power controller, a full-featured Li-Ion battery charger, a
Hot Swap output, a low-battery indicator, and numerous
internal protection features. The LTC3455 provides a
small, simple solution for obtaining power from three
different power sources: a single-cell Li-Ion battery, a USB
port, and a wall adapter. Current drawn from the USB bus
is accurately limited under all conditions. Whenever a USB
or a wall adapter is present, the battery charger is enabled
and all internal power for the device is drawn from the
appropriate external power source. All outputs are dis-
charged to ground during shutdown to provide complete
output disconnect. The device is available in a
4mm
脳
4mm 24-pin exposed-pad QFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
*U.S. Patent 6,522,118
s
s
s
s
s
Seamless Transition between Input Power Sources:
Li-Ion Battery, USB, and 5V Wall Adapter
Accurate USB Current Limiting (500mA/100mA)
Two High Efficiency DC/DC Converters: Up to 96%
Thermal Regulation Maximizes Battery Charge
Rate without Risk of Overheating*
Full-Featured Li-Ion Battery Charger
Hot Swap鈩?Output for SDIO and Memory Cards
Pin-Selectable Burst Mode
廬
Operation
Output Disconnect: All Outputs Discharged to
Ground During Shutdown
Available in a 4mm
脳
4mm
脳
0.8mm 24-Pin
QFN Package
APPLICATIO S
s
s
s
Handheld Computers
Digital Cameras
MP3 Players
TYPICAL APPLICATIO
USB 5V
1鈩?/div>
4.7碌F
WALL 5V
1鈩?/div>
1碌F
10碌F
3.32k
1k
4
11
0.1碌F
1.24k
2.49k
9
4.7碌F
SINGLE
CELL Li-ION
3.3V TO 4.2V
V
BAT
3
2
TIMER
PROG
CHRG
WALLFB
USB
CONTROLLER
8
6
5
10
USB
SUSPEND
USBHP
V
MAX
MODE
HSON
ON2
PWRON
RST
PBSTAT
LTC3455
21
15
19
22
20
23
1M
24
14
1M
1.8V
ON/OFF
3.3V, HS
1碌F
碌C
100
95
90
EFFICIENCY (%)
85
80
75
70
65
60
1.8V
0.4A
10碌F
80.6k
SWITCHER 2
V
OUT2
= 3.3V
ON
HSO
HSI
SW2
FB2
13
12
18
4.7碌H
10pF
249k
3.3V
0.5A
10碌F
80.6k
+
1.8V
1M
LBO
V
BAT
2.49M
16
806k
AI
17
AO
V
BAT
= 3.6V
1
10
100
LOAD CURRENT (mA)
1000
3455 TA01b
SW1
FB1
GND
3455 TA01a
7
1
25
4.7碌H
10pF
100k
U
U
U
Efficiency
SWITCHER 1
V
OUT1
= 1.8V
3455f
1

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