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LTC3456EUF Datasheet

  • LTC3456EUF

  • 2-Cell, Multi-Output DC/DC Converter with USB Power Manager

  • 28頁

  • LINER

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LTC3456
2-Cell, Multi-Output
DC/DC Converter with
USB Power Manager
FEATURES
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DESCRIPTIO
Seamless Transition Between 2-Cell Battery, USB
and AC Wall Adapter Input Power Sources
Main Output: Fixed 3.3V Output
Core Output: Adjustable from 0.8V to V
BATT(MIN)
Hot Swap
TM
Output for Memory Cards
All Outputs Discharged to Ground During Shutdown
Power Supply Sequencing:
Main and Hot Swap
Outputs Come Up After Core Output
Accurate USB Current Limiting
High Frequency Operation: 1MHz
High Efficiency: Up to 92%
Small (4mm
脳
4mm
脳
0.75mm) 24-Pin QFN Package
The LTC
廬
3456 is a complete power management system
IC optimized for a variety of portable applications. The
device generates two separate power rails: a 3.3V (fixed)
Main supply and a 1.8V (adjustable) Core supply. In
addition, the LTC3456 contains a USB power manager, a
Hot Swap output, a low-battery indicator and an always-
alive V
MAX
output. The LTC3456 takes power from one of
three sources: a Wall adapter, a USB port or a 2-cell
Alkaline/NiCd/NiMH battery, in that order of priority. Cur-
rent drawn from the USB port is accurately limited to
100mA or 500mA based on the state of the USBHP pin.
The Main and Core switchers are all high efficiency, 1MHz
fixed frequency PWM converters. Availability in a small
(4mm
脳
4mm
脳
0.75mm) 24-pin QFN package makes the
LTC3456 ideal for space-sensitive portable devices.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
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GPS Portable Navigators
MP3 Players
Digital Cameras
Handheld Computers
TYPICAL APPLICATIO
2 AA
CELLS
+
4.7碌F
L2
4.7碌H
100k
AIN
80.6k
AO
V
BATT
L3
10碌H
SW2_BK
V
INT
V
MAIN
22碌F
V
INT
3.3V
SW2_BST
MAIN OUTPUT
3.3V
1碌F 150mA
Hot Swap OUTPUT
3.3V
1碌F 50mA
CORE OUTPUT
1.8V
10碌F 200mA
220pF
4.7碌F
1鈩?/div>
SUSPEND
USB
LTC3456
SW1
L1
10碌H
EFFICIENCY (%)
USB POWER
(4.35V TO 5.5V)
USB
CONTROLLER
USBHP
HSO
1k
AC WALL
ADAPTER
(5V
鹵10%)
EXT_PWR
V
EXT
4.7碌F
1鈩?/div>
WALLFB
4.32k
PWRKEY
V
MAX
11.3k
10碌F
FB1
100k
80.6k
V
MAX
(POWERS
1碌F REAL-TIME CLOCK)
PBSTAT RESET MODE PWRON PGND AGND
碌P
3456 TA01
U
Efficiency and Power Loss
vs Load Current
(Battery Powered)
100
V
BATT
= 2.4V
90 MODE = 0V
80
70
60
50
40
30
20
10
0
1
10
100
LOAD CURRENT (mA)
POWER LOSS
1.8V
OUTPUT
3.3V
OUTPUT
EFFICIENCY
3.3V
OUTPUT
150
250
200
U
U
POWER LOSS (mW)
100
1.8V
OUTPUT
50
0
1000
3456 TA01b
3456f
1

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