參數(shù)資料
型號(hào)： LTC3456EUF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： ECONOLINE: RSZ/P - 1kVDC
中文描述： 0.9 A BATTERY CHARGE CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-24
文件頁數(shù)： 1/28頁
文件大?。?/td> 358K
代理商： LTC3456EUF
1
LTC3456
3456f
2-Cell, Multi-Output
DC/DC Converter with
USB Power Manager
■
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
×
4mm
×
0.75mm) 24-Pin QFN Package
APPLICATIU
■
GPS Portable Navigators
■
MP3 Players
■
Digital Cameras
■
Handheld Computers
DESCRIPTIOU
The LTC
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
×
4mm
×
0.75mm) 24-pin QFN package makes the
LTC3456 ideal for space-sensitive portable devices.
FEATURES
TYPICAL APPLICATIO
U
+
WALLFB
PWRKEY
PBSTAT RESET MODE
V
MAX
V
EXT
10
μ
F
4.7
μ
F
4.7
μ
F
1k
11.3k
1
4.7
μ
F
1
AC WALL
ADAPTER
(5V
±
10%)
USB POWER
(4.35V TO 5.5V)
USB
CONTROLLER
4.32k
80.6k
100k
L2
4.7
μ
H
2 AA
CELLS
L3
10
μ
H
EXT_PWR
USB
SUSPEND
USBHP
AO
AIN
V
MAIN
V
BATT
V
INT
SW2_BST
LTC3456
SW2_BK
μ
P
PWRON PGND AGND
22
μ
F
V
3.3V
MAIN OUTPUT
3.3V
150mA
1
μ
F
HSO
Hot Swap OUTPUT
3.3V
50mA
1
μ
F
1
μ
F
3456 TA01
SW1
FB1
L1
10
μ
H
CORE OUTPUT
1.8V
200mA
V
(POWERS
REAL-TIME CLOCK)
10
μ
F
220pF
100k
80.6k
LOAD CURRENT (mA)
1
40
E
P
50
60
70
80
10
100
1000
3456 TA01b
30
20
10
0
90
100
100
150
200
50
0
250
V
= 2.4V
MODE = 0V
EFFICIENCY
POWER LOSS
1.8V
OUTPUT
1.8V
OUTPUT
3.3V
OUTPUT
3.3V
OUTPUT
Efficiency and Power Loss
vs Load Current
(Battery Powered)
, 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.
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