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LT1616

更新时间： 2024-09-15 21:55:23
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
28页 358K
描述
2-Cell, Multi-Output DC/DC Converter with USB Power Manager

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中文翻译

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LT1616 数据手册

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LTC3456  
2-Cell, Multi-Output  
DC/DC Converter with  
USB Power Manager  
U
FEATURES  
DESCRIPTIO  
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 VMAX 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.  
■
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 VBATT(MIN)  
Hot SwapTM 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  
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.  
U
APPLICATIO S  
■
GPS Portable Navigators  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
MP3 Players  
Hot Swap is a trademark of Linear Technology Corporation.  
■
All other trademarks are the property of their respective owners.  
Digital Cameras  
Handheld Computers  
■
U
TYPICAL APPLICATIO  
V
INT  
3.3V  
+
2 AA  
22µF  
1µF  
Efficiency and Power Loss  
vs Load Current  
4.7µF  
L2  
L3  
CELLS  
4.7µH  
10µH  
(Battery Powered)  
100k  
V
SW2_BST SW2_BK  
V
INT  
BATT  
MAIN OUTPUT  
3.3V  
100  
90  
250  
200  
150  
100  
50  
AIN  
AO  
V
MAIN  
V
= 2.4V  
BATT  
150mA  
MODE = 0V  
80.6k  
Hot Swap OUTPUT  
3.3V  
50mA  
80  
HSO  
1.8V  
OUTPUT  
3.3V  
OUTPUT  
USBHP  
70  
USB  
USB POWER  
(4.35V TO 5.5V)  
1µF  
L1  
CONTROLLER  
SUSPEND  
60  
50  
4.7µF  
1Ω  
10µH  
CORE OUTPUT  
1.8V  
200mA  
EFFICIENCY  
SW1  
FB1  
LTC3456  
USB  
3.3V  
10µF  
40  
30  
20  
10  
0
1k  
OUTPUT  
POWER LOSS  
100k  
EXT_PWR  
AC WALL  
ADAPTER  
(5V ±10%)  
220pF  
V
EXT  
4.7µF  
1Ω  
1.8V  
OUTPUT  
10µF  
11.3k  
4.32k  
80.6k  
V
MAX  
WALLFB  
PWRKEY  
0
V
(POWERS  
MAX  
1
10  
100  
1000  
REAL-TIME CLOCK)  
1µF  
LOAD CURRENT (mA)  
PBSTAT RESET MODE PWRON PGND AGND  
3456 TA01b  
3456 TA01  
µP  
3456f  
1
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