參數(shù)資料
型號(hào)： LTC3544EUD
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 0.8 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PQCC16
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, MO220WEED-2, QFN-16
文件頁數(shù)： 1/16頁
文件大小： 295K
代理商： LTC3544EUD
LTC3544
1
3544fa
■
Cellular Telephones
■
Personal Information Appliances
■
Wireless and DSL Modems
■
Digital Still Cameras
■
Media Players
■
Portable Instruments
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Quad Synchronous
Step-Down Regulator: 2.25MHz,
300mA, 200mA, 200mA, 100mA
The LTC
3544 is a quad, high efficiency, monolithic
synchronous buck regulator using a constant-frequency,
current mode architecture. The four regulators operate
independently with separate run pins. The 2.25V to 5.5V
input voltage range makes the LTC3544 well suited for
single Li-Ion/polymer battery-powered applications.
100% duty cycle provides low dropout operation, ex-
tending battery runtime in portable systems. Low ripple
Burst Mode operation increases efciency at light loads,
further extending battery runtime with typically only 20mV
of ripple.
Switching frequency is internally set to 2.25MHz, allowing
the use of small surface mount inductors and capacitors.
The internal synchronous switches increase efciency
and eliminate the need for external Schottky diodes. Low
output voltages are easily supported with the 0.8V feedback
reference voltage.
The LTC3544 is available in a low prole (0.75mm) (3mm
× 3mm) QFN package.
■
High Efciency: Up to 95%
■
Four Independent Regulators Provide Up to 300mA,
200mA, 200mA and 100mA Output Current
■
2.25V to 5.5V Input Voltage Range
■
2.25MHz Constant-Frequency Operation
■
No Schottky Diodes Required
■
Extremely Low Channel-to-Channel Transient
Crosstalk
■
Low Ripple (20mVP-P) Burst Mode Operation:
IQ = 70μA (All Channels On)
■
0.8V Reference Allows Low Output Voltages
■
Shutdown Mode Draws <1μA Supply Current
■
Current Mode Operation for Excellent Line and Load
Transient Response
■
Overtemperature Protected
■
Low Prole (3mm × 3mm) 16-Lead QFN Package
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131, 5994885.
4.7
μH
3.3
μH
10
μH
93.1k
107k
4.7
μF
CER
4.7
μF
CER
3.3
μH
133k
59k
107k
118k
3544B TA01a
4.7
μF
CER
4.7
μF
CER
4.7
μF
CER
VOUT3
0.8V
200mA
VOUT1
1.2V
100mA
VOUT2
1.5V
200mA
VIN
2.25V TO 5.5V
VOUT4
1.8V
300mA
RUN200B
SW200B
VFB200B
RUN200A
SW200A
VFB200A
RUN300
SW300
VFB300
RUN100
SW100
VFB100
VCC
PVIN
LTC3544
GNDA
PGND
100k
High Efciency Quad Step-Down Converter
LOAD CURRENT (A)
30
EFFICIENCY
(%)
POWER
LOSS
(W)
90
100
20
10
80
50
70
60
40
0.0001
0.01
0.1
1
3544 TA01b
0
1
0.1
0.01
0.001
0.0001
0.001
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
VOUT = 2.5V
TA = 25°C
EFFICIENCY
LOSS
Efciency vs Load Current, 300mA
Channel, All Other Channels Off
相關(guān)PDF資料
PDF描述
LTC3547BEDDB 0.7 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO8
LTC3549EDCB#TRM 0.6 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6
LTC3549EDCB#TR 0.6 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6
LTC3553EUD#TRPBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20
LTC3553EUD#PBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3544EUD#PBF 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2
LTC3544EUD#TRPBF 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
LTC3544EUDPBF 制造商:Linear Technology 功能描述:2.25MHz Sync Step-Down Converter LTC3544
LTC3544EUD-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA
LTC3544EUD-TR 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA
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