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参数资料
| 型号： | LTC3456 |
| 厂商： | Linear Technology Corporation |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 2-Cell, Multi-Output DC/DC Converter with USB Power Manager |
| 中文描述： | 2节电池，多输出DC / DC转换器与USB电源管理器 |
| 文件页数： | 15/28页 |
| 文件大小： | 358K |
| 代理商： | LTC3456 |
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15
LTC3456
3456f
MAIN REGULATOR
V
INT
Output
The main regulator produces a fixed 3.3V output from a
1.8V to 3.2V input (2-cell battery), USB port or AC adapter
input supply. The main regulator output, V
INT
, is used to
power most of the internal circuitry of the IC. It is the first
one to power-up. Connect a 22
μ
F or higher X5R or X7R
type ceramic capacitor from this pin to ground.
The loading on this output should be limited to 20mA.
Refer to the Minimum Start-Up Battery Voltage vs
V
INT
Output Current graph in the Typical Performance
Characteristics.
When the IC is turned off, the V
INT
output voltage is
discharged to ground.
Output Disconnect and Inrush Limiting
The LTC3456 allows true output disconnect when pow-
ered off the battery (boost topology). It achieves this by
disconnecting the body diode of the synchronous PMOS
switch from the output. This allows the V
INT
to go to
ground during shutdown. Do not connect a Schottky diode
from SW2_BST to V
INT
; doing so will defeat the output
disconnect feature.
The LTC3456 also features inrush current limiting at
power-up (battery powered). Inrush current in boost
converters is important when powering from input sources
with high input impedance like alkaline cells. The LTC3456
incorporates an inrush current limiting scheme that regu-
lates the inrush current to 600mA (typ) during power-up.
Figure 5 shows inrush current when the device is powered
up from the battery.
Short-Circuit Protection
The LTC3456 features short-circuit protection for the main
regulator output. When the main regulator is powered
from the USB or wall input, it operates in a buck topology.
OPERATIOU
If the main regulator outputs (V
INT
or V
MAIN
) are shorted
to ground, the LTC3456 unique control scheme prevents
inductor current runaway.
When the device is powered from the battery, it operates
in a boost topology. Most boost converters do not allow their
outputs to be shorted to ground. However, the LTC3456
allows the output of its main regulator (V
INT
or V
MAIN
) to
be short-circuited due to its unique inrush current limiting.
In the event of a short-circuit, the input current is well
regulated.
V
MAIN
Output
The LTC3456 is designed to supply power to the micro-
processor peripheral circuitry in a controlled manner. The
peripheral circuitry should be connected to the V
MAIN
output.
V
MAIN
is connected to V
INT
via a 0.4
(typ) PMOS switch
0.8ms (typ) after the Core output comes into regulation.
This ensures that the peripheral circuitry always powers
up after the microprocessor.
The V
MAIN
output is discharged to ground through inter-
nal pull-down resistors at shutdown. This ensures that
the peripheral circuitry gets turned-off completely during
shutdown.
Connect a 1
μ
F (X5R or X7R) bypass capacitor
from this pin to ground.
Figure 5. Inrush Current at Power-Up (Battery Powered)
PWRON
5V/DIV
V
2V/DIV
I
L2
500mA/DIV
100
μ
s/DIV
V
BATT
= 2.4V
I
VINT
= 10mA
3456 F05
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相关代理商/技术参数 |
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| LTC3456EUF | 制造商:Linear Technology 功能描述:Power Management System 24-Pin QFN EP |
| 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 |
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