參數(shù)資料
型號(hào)： LTC3446IDE#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 1/20頁(yè)
文件大小： 283K
描述： IC REG TRPL BCK/LINEAR 14-DFN
標(biāo)準(zhǔn)包裝： 91
拓?fù)洌?/td> 降壓（降壓）同步（1），線性（LDO）（2）
功能： 任何功能
輸出數(shù)： 3
頻率 - 開(kāi)關(guān)： 2.25MHz
電壓/電流 - 輸出 1： 可調(diào)至0.8V，1A
電壓/電流 - 輸出 2： 可調(diào)至0.4V，300mA
電壓/電流 - 輸出 3： 可調(diào)至0.4V，300mA
帶 LED 驅(qū)動(dòng)器： 無(wú)
帶監(jiān)控器： 無(wú)
帶序列發(fā)生器： 無(wú)
電源電壓： 0.9 V ~ 5.5 V
工作溫度： -40°C ~ 125°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-DFN-EP（4x3）
包裝： 管件
LTC3446
1
3446ff
Typical applicaTion
FeaTures
applicaTions
DescripTion
Monolithic Buck Regulator
with Dual VLDO Regulators
The LTC
?/DIV>
3446 combines a synchronous buck DC/DC con-
verter with two very low dropout (VLDO) linear regulators
to provide up to three stepped-down output voltages from
a single input voltage. The input voltage range is ideally
suited for Li-Ion battery-powered applications, as well
as powering low voltage logic from 5V or 3.3V rails. The
output voltage range extends down to 0.4V for the VLDO
regulators and 0.8V for the buck.
The 1A synchronous buck converter provides the main
output with high efficiency, typically 85%. The two 300mA
VLDO regulators can run off the main output to provide
two additional lower voltage outputs. A built-in supply
monitor provides a power good indication.
The buck converter switches at 2.25MHz, allowing the use
of small surface mount inductors and capacitors. Constant
frequency current mode operation produces controlled
output spectrum and fast transient response. A mode-
select pin allows automatic Burst Mode operation to be
enabled for higher efficiency at light load, or disabled for
lower noise operation down to very light loads. The two
VLDO regulators are stable with ceramic output capacitors
as small as 1礔.
L, LT, LTC, LTM and Burst Mode are registered trademarks and VLDO, Hot Swap, PowerPath
and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 5481178, 6611131,
6304066, 6498466, 6580258.
Buck Efficiency vs Buck Load Current
n
 High Effciency Triple Step-Down Outputs from a 
Single Input Supply
n
 1A Synchronous Buck Regulator Provides Main
Step-Down Output and Powers Two 300mA VLDO"
Linear Regulators
n
 Output Voltages as Low as 400mV (VLDO Outputs)
n
 Power Good Output
n
 Input Voltage Range: 2.7V to 5.5V
n
 Independent Enable Pin for Each Supply
n
 Low (140礎(chǔ) Typ) No-Load Quiescent Current with
All Outputs Enabled
n
 Constant Frequency Current Mode Operation
n
 2.25MHz Switching Frequency Uses Small Inductors
n
 Defeatable Automatic Burst Mode
?/DIV>
 Operation for
High Efficiency at Light Loads
n
 ?.5% Reference Accuracy
n
 Overtemperature Protection
n
 Thermally Enhanced 4mm ?3mm 14-Pin DFN
Package
n
 Low Power Handheld Devices
n
 Low Voltage and Multivoltage Power for Digital
Logic, I/O, FPGAs, CPLDs, ASICs and CPUs
V
IN
59k
L1
1.8礖
47.5k
SW
BUCKFB
LV
IN
LTC3446
GND
22礔
X7R
1000pF
DIGITAL
CONTROL
22礔
X7R
V
OUT
1.8V
400mA MAX
110k
40.2k
2.2礔
X7R
V
OUT
1.5V
300mA MAX
V
IN
2.9V TO 5.5V
LV
OUT1
PGOOD
MODESEL
ENBUCK
ENLDO1
ENLDO2
LV
FB1
80.6k
40.2k
2.2礔
X7R
L1: TOKO A960AW-1R8M
3446 TA01
V
OUT
1.2V
300mA MAX
LV
OUT2
3.3k
I
TH
LV
FB2
LOAD CURRENT (mA)
1
40
50
60
70
80
100
10
100
3446 TA01b
1000
90
V
IN
 = 2.7V
V
IN
 = 3.6V
V
IN
 = 4.2V
Burst Mode
OPERATION
PWM
MODE
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3446IDE-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Monolithic Buck Regulator with Dual VLDO Regulators
LTC3447 制造商:LINER 制造商全稱:Linear Technology 功能描述:I2C Controllable Buck Regulator in 3mm × 3mm DFN
LTC3447EDD 功能描述:IC REG BUCK SYNC ADJ 0.6A 10DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC
LTC3447EDD#PBF 功能描述:IC REG BUCK SYNC ADJ 0.6A 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)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(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2
LTC3447EDD#TR 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 5.5V 10-Pin DFN EP T/R
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