參數(shù)資料
型號(hào)： LTC3445EUF#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 1/24頁(yè)
文件大小： 475K
描述： IC REG TRPL BUCK/LINEAR 24-QFN
標(biāo)準(zhǔn)包裝： 2,500
拓?fù)洌?/td> 降壓（降壓）（1），線性（LDO）（2）
功能： 任何功能
輸出數(shù)： 3
頻率 - 開關(guān)： 1.5MHz
電壓/電流 - 輸出 1： 0.85 V ~ 1.55 V，600mA
電壓/電流 - 輸出 2： 可調(diào)至0.6V，50mA
電壓/電流 - 輸出 3： 可調(diào)至0.6V，50mA
帶 LED 驅(qū)動(dòng)器： 無
帶監(jiān)控器： 無
帶序列發(fā)生器： 無
電源電壓： 2.5 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 24-QFN 裸露焊盤（4x4）
包裝： 帶卷 (TR)
1
LTC3445
3445fa
Buck Regulator
?/DIV>
High Efficiency: Up to 93%
?/DIV>
600mA Output Current (V
CC1
 = 3V, V
OUT
 = 1.3V)
?/DIV>
Programmable Output Voltage: 0.85V to 1.55V
?/DIV>
2.5V to 5.5V Input Voltage Range
?/DIV>
1.5MHz Constant Frequency or Spread Spectrum
Option
?/DIV>
Soft-Start
LDOs
?/DIV>
Two LDO Regulators: 0.3V Dropout at 50mA
PowerPath Controller
?/DIV>
Dynamically Regulates V
CC
BATT
I
2
C
?/DIV>
Standard (100kHz) or Fast Mode (400kHz)
?/DIV>
24-Lead (4mm ?4mm) QFN Package
I
2
C Controllable
Buck Regulator with Two LDOs
in a 4mm ?4mm QFN
?/DIV>
Intels Microprocessor Supply (PXA27X)
?/DIV>
Portable Instruments
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LTC
?/DIV>
3445 contains a high efficiency monolithic syn-
chronous current mode buck regulator, two LDO regula-
tors, a PowerPath
TM
 controller and an I
2
C
TM
 interface.
The buck regulator has a 6-bit programmable output range
of 0.85V to 1.55V. Also, the buck regulator uses either a
constant (1.5MHz) or a spread spectrum switching fre-
quency. Using the spread spectrum option allows for a
lower noise regulated output as well as low noise at the
input. In addition, the regulated output voltage slew rate is
programmable via the I
2
C interface.
The LTC3445 contains two LDO voltage regulators. The
regulator output voltages are externally resistor program-
mable. Each LDO is capable of delivering up to 50mA.
The LTC3445 contains control circuitry (PowerPath) for
automatic back-up battery selection. V
BACKUP
 is typically
a coin cell.
Typical supply current during operation is only 360礎(chǔ) and
drops to 27礎(chǔ) in shutdown. The 2.5V to 5.5V input
voltage range makes the LTC3445 ideal for single Li-Ion
battery-powered applications. Automatic Burst Mode
?/DIV>
operation increases efficiency at light loads, further ex-
tending battery life.
Burst Mode is a registered trademark of Linear Technology Corporation.
PowerPath is a trademark of Linear Technology Corporation.
I
2
C is a trademark of Philips Electronics N.V.
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466,
6611131, Spread Spectrum patent pending.
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
+
2.2礖
705k
604k
4.7礔
CER
4.7礔
CER
10礔
CER
1.3V
0.85V
TO 1.55V
3V
TYP
V
CC2
GND
LTC3445
V
CC1
nBATT_FAULT
V
CC1
BATTFAULT
4.7礔
CER
V
CC
BATT
V
TRACK
3V
COIN
CELL
V
BACKUP
LDO1
LDO1FB
LDO2
LDO2FB
SW
FB
RUN
SDA
I
2
C BUS
PWR_EN
V
CC1
 OR GND
V
CC1
 OR GND
SCL
ADD7
ADD6
PGOOD
V
CC
nV
CC
_FAULT
V
CC
20k
3445 TA01
503k   604k
10礔
CER
1.1V
V
BACKUP
20k
V
BACKUP
Efficiency and Power Loss
vs Load Current, V
CC1
 = 3.6V
LOAD CURRENT (mA)
30
90
100
20
10
80
50
70
60
40
0.1
10    100   1000
3445 TA01b
0
1
DAC MAX
DAC MIN
DAC MIN
DAC MAX
100
1000
10
1.0
0.1
EFFICIENCY
POWER LOSS
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參數(shù)描述
LTC3446 制造商:LINER 制造商全稱:Linear Technology 功能描述:Monolithic Buck Regulator with Dual VLDO Regulators
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LTC3446EDE#PBF 功能描述:IC REG TRPL BCK/LINEAR 14-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
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