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参数资料
| 型号： | LTC3456EUF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | ECONOLINE: RSZ/P - 1kVDC |
| 中文描述： | 0.9 A BATTERY CHARGE CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-24 |
| 文件页数： | 12/28页 |
| 文件大小： | 358K |
| 代理商： | LTC3456EUF |
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12
LTC3456
3456f
OPERATIOU
INTRODUCTION
The LTC3456 is a complete system-level power supply IC
used to power GPS portable navigators and other portable
systems. It takes power from one of three sources: battery,
USB or wall adapter. The device provides an integrated
standard solution resulting in a reduced parts count and
higher efficiency.
The LTC3456 generates two separate power supplies: a
Core supply for the processor and a Main supply for the
peripheral circuitry. The Main supply is a fixed 3.3V output
and the Core supply voltage can be adjusted from 0.8V to
V
BATT(MIN)
. In addition, the LTC3456 provides a Hot Swap
output which can be used for powering flash memory
cards. Both regulators utilize a 1MHz constant frequency
current mode architecture.
The device also incorporates a low-battery detector
(configurable as a low dropout regulator), USB power
manager and several protection features in a single pack-
age. The LTC3456’s control scheme allows 100% duty
cycle operation for the core output. It provides low dropout
operation when the core output is powered from the
battery, thereby extending battery life.
OPERATING MODES
The LTC3456 is powered from an AC wall adapter, USB or
battery, in that order of priority. It has onboard voltage
detectors to monitor the status of the wall adapter and USB
voltages. The unique control scheme of the LTC3456
allows seamless transition between battery, USB and wall
adapter input power sources.
Battery Powered
The LTC3456 is designed to accept an input battery
voltage range from 1.8V to 3.2V. This range is ideal for
2-cell Alkaline, NiCd or NiMH designs. Figure 2 shows an
LTC3456 being powered from two AA cells.
When enabled, the internal supply voltage V
INT
(3.3V) is
generated via the boost regulator. V
INT
is used to power
the bandgap reference, drivers and other internal circuitry.
Core output (1.8V) comes up next via the buck regulator.
Main output and the Hot Swap output are powered up with
a delay after the core output is in regulation.
Figure 2. Battery-Powered LTC3456
17
+
–
V
OS
+
HSO
R
V
MAIN
Hot Swap OUTPUT
3.3V
50mA
1
μ
F
3456 F02
16
MAIN OUTPUT
3.3V
150mA
V
INT
3.3V
1
μ
F
V
INT
SW2_BST
15
14
22
μ
F
10
μ
F
BOOST
LTC3456
CORE OUTPUT
1.8V
200mA
SW1
V
BATT
V
BATT
2 AA CELLS
1.8V TO 3.2V
5
4
BUCK
L2
4.7
μ
H
L1
10
μ
H
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相关代理商/技术参数 |
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|---|---|
| LTC3456EUF#PBF | 功能描述:IC CONV DC/DC USB BATT 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3456EUF#TRPBF | 功能描述:IC CONV DC/DC USB BATT 24-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3458 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect |
| LTC3458EDE | 功能描述:IC REG BOOST SYNC ADJ 1.4A 12DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3458EDE#PBF | 功能描述:IC REG BOOST SYNC ADJ 1.4A 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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