參數(shù)資料
型號(hào)： LTC3553EUD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20
封裝： 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20
文件頁(yè)數(shù)： 7/36頁(yè)
文件大小： 518K
代理商： LTC3553EUD#TRPBF
LTC3553
15
3553fa
Introduction
The LTC3553 is a highly integrated power management
IC that includes the following features:
PowerPath controller
Battery charger
Ideal diode
Pushbutton controller
200mA buck regulator
150mA low dropout (LDO) linear regulator
Designed specically for USB applications, the PowerPath
controller incorporates a precision input current limit
which communicates with the battery charger to ensure
that input current never violates the USB specications.
The ideal diode from BAT to VOUT guarantees that ample
power is always available to VOUTevenifthereisinsufcient
or absent power at VBUS. The LTC3553 also includes a
pushbutton input to control the two regulators and system
reset. The constant-frequency current mode step-down
switching regulator provides 200mA and supports 100%
duty cycle operation as well as Burst Mode operation for
high efciency at light load. No external compensation
components are required for the switching regulator. The
LDO can deliver up to 150mA, and is stable with a ceramic
output capacitor of at least 1μF. For application exibility,
the LDO’s power input pin, VINLDO, is independent of the
buck’s BVIN pin. The LDO can be powered by the buck
output or be driven by the PowerPath VOUT.
Either regulator can be programmed for a minimum output
voltage of 0.8V and can be used to power a microcontroller
core, microcontroller I/O, memory or other logic circuitry.
The buck regulator operates at 1.125MHz. Both regulators
include a low power standby mode which can be used to
power essential keep-alive circuitry while draining ultralow
current from the battery for extended battery life.
USB PowerPath Controller
The input current limit and charger control circuits of the
LTC3553 are designed to limit input current as well as
control battery charge current as a function of IVOUT. VOUT
drives the combination of the external load, the buck and
LDO regulators and the battery charger.
If the combined load does not exceed the programmed
input current limit, VOUT will be connected to VBUS through
an internal 350mΩ P-channel MOSFET. If the combined
load at VOUT exceeds the programmed input current limit,
the battery charger will reduce its charge current by the
amount necessary to enable the external load to be satised
while maintaining the programmed input current. Even if
the battery charge current is set to exceed the allowable
USB current, the average input current USB specication
will not be violated. Furthermore, load current at VOUT will
always be prioritized and only excess available current will
be used to charge the battery.
The input current limit is programmed by the HPWR and
SUSP pins. If SUSP pin set high, the input current limit
is disabled. If SUSP pin is low, the input current limit is
enabled. HPWR pin selects between 100mA input current
limit when it is low and 500mA input current limit when
it is high.
Ideal Diode From BAT to VOUT
The LTC3553 has an internal ideal diode from BAT to VOUT
designed to respond quickly whenever VOUT drops below
BAT. If the load increases beyond the input current limit,
additional current will be pulled from the battery via the ideal
diode. Furthermore, if power to VBUS (USB) is removed,
then all of the application power will be provided by the
battery via the ideal diode. The ideal diode is fast enough
to keep VOUT from dropping signicantly with just the
recommended output capacitor. The ideal diode consists
of a precision amplier that enables an on-chip P-channel
OPERATION
Simplied PowerPath Block Diagram
100mA/500mA
INPUT CURRENT
LIMIT
CC/CV
CHARGER
15mV
IDEAL
3553 F01a
+
–
VOUT
18
VBUS 20
BAT
17
相關(guān)PDF資料
PDF描述
LTC3553EUD#PBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20
LTC3554EPD#TRPB 0.5 A BATTERY CHARGE CONTROLLER, 1295 kHz SWITCHING FREQ-MAX, PQCC20
LTC3560IS6#TRPBF 2.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6
LTC3563EDC 1.75 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6
LTC3568EDD#TR 4 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3554 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators
LTC3554EPD 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators
LTC3554EPD#PBF 功能描述:IC USB POWER MANAGER 20-UTQFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
LTC3554EPD#TRPBF 功能描述:IC USB POWER MANAGER 20-UTQFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件
LTC3554EPDPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators
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