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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： | 14/28页 |
| 文件大小： | 358K |
| 代理商： | LTC3456 |
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14
LTC3456
3456f
USB Powered
The LTC3456 is designed to be powered from the USB as
shown in Figure 4. The LTC3456 has an internal current-
limited 0.5
(typ) PMOS switch with preset 0.1A and 0.5A
current limits. The LTC3456 interfaces with the USB
controller bus via logic pins USBHP and SUSPEND.
The USBHP pin is used to set the USB current limit to either
100mA or 500mA. This pin has a weak 2.5
μ
A pull-down
current source to ensure that Low Power mode is in effect
during start-up. If the USBHP pin is held low, it limits the
input power drawn from the USB port. The USB port can
supply the Core output (1.8V at 200mA) effortlessly in Low
Power mode (USBHP = 0V). However, the loading on the
3.3V output must be held below 100mA (typ) when the
USB is in low power mode. If the loading on 3.3V output
is increased beyond 100mA (typ), the USB port is unable
to supply the load current and the LTC3456 will switch
between the battery and the USB port. This results in
undesirable switching noise and increased voltage ripple
at the 3.3V output.
Pulling the SUSPEND pin logic high disables all USB
functionality. The USB switch connected between USB
and V
EXT
behaves like a back-to-back diode whenever
SUSPEND is pulled high. In Suspend mode the device
limits the current drawn from the USB pin to 100
μ
A (typ).
The minimum voltage to a USB-powered device may drop
as low as 4.35V due to cable and connector drops. The
LTC3456 has an internal voltage monitor that checks the
USB supply voltage and cuts off the USB power if the USB
voltage falls below 4V. There is 75mV of hysteresis built-
in the USB voltage monitor.
When the IC is enabled, the USB pin is connected to the
V
EXT
pin via the PMOS switch. The V
EXT
pin gets charged
by the preset 0.1A or 0.5A current limit determined by the
state of the USBHP pin. As the V
EXT
pin voltage rises above
4V, the V
INT
, Core output, Main output and Hot Swap
outputs power-up in that sequence.
OPERATIOU
17
+
–
V
OS
HSO
R
V
MAIN
Hot Swap OUTPUT
3.3V
50mA
1
μ
F
3456 F04
16
MAIN OUTPUT
3.3V
150mA
V
INT
3.3V
1
μ
F
SW2_BK
13
V
INT
15
USB
USB_RDY
22
μ
F
10
μ
F
10
μ
F
4.7
μ
F
1
BUCK 2
LTC3456
CORE OUTPUT
1.8V
200mA
SW1
V
EXT
4V
EN
V
EXT
5
9
BUCK 1
L1
10
μ
H
L3
10
μ
H
10
SUSPEND
SUSPEND
4V
USB
4.35V TO 5.5V
18
USBHP
USBHP
100mA
500mA
12
+
–
+
–
Figure 4. USB-Powered LTC3456
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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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