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參數(shù)資料
| 型號： | LTC3445 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 12-Bit To 24-Bit Multiplexed D-Type Latch With 3-State Outputs 56-SSOP -40 to 85 |
| 中文描述： | 降壓穩(wěn)壓器的I2C可控雙采用4mm？4mm QFN封裝LDO的 |
| 文件頁數(shù)： | 1/24頁 |
| 文件大小： | 465K |
| 代理商： | LTC3445 |
1
LTC3445
3445fa
Buck Regulator
■
High Efficiency: Up to 93%
■
600mA Output Current (V
CC1
= 3V, V
OUT
= 1.3V)
■
Programmable Output Voltage: 0.85V to 1.55V
■
2.5V to 5.5V Input Voltage Range
■
1.5MHz Constant Frequency or Spread Spectrum
Option
■
Soft-Start
LDOs
■
Two LDO Regulators: 0.3V Dropout at 50mA
PowerPath Controller
■
Dynamically Regulates V
CC
BATT
I
2
C
■
Standard (100kHz) or Fast Mode (400kHz)
■
24-Lead (4mm
×
4mm) QFN Package
APPLICATIU
I
2
C Controllable
Buck Regulator with Two LDOs
in a 4mm
×
4mm QFN
■
Intel’s Microprocessor Supply (PXA27X)
■
Portable Instruments
, LTC and LT are registered trademarks of Linear Technology Corporation.
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.
The LTC
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
μ
A and
drops to 27
μ
A 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
operation increases efficiency at light loads, further ex-
tending battery life.
FEATURES
DESCRIPTIOU
TYPICAL APPLICATIO
U
+
2.2
μ
H
705k
604k
4.7
μ
F
CER
4.7
μ
F
CER
10
μ
F
CER
1.3V
0.85V
TO 1.55V
3V
TYP
V
CC2
GND
LTC3445
V
CC1
nBATT_FAULT
V
CC1
V
TRACK
V
BACKUP
BATTFAULT
V
CC
BATT
4.7
μ
F
CER
3V
COIN
CELL
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
μ
F
CER
1.1V
V
BACKUP
20k
V
BACKUP
Efficiency and Power Loss
vs Load Current, V
CC1
= 3.6V
LOAD CURRENT (mA)
30
E
P
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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| LTC3445EUF | 制造商:Linear Technology 功能描述:Conv DC-DC Triple Step Down 2.5V to 5.5V 24-Pin QFN EP |
| LTC3445EUF#PBF | 功能描述:IC REG TRPL BUCK/LINEAR 24-QFN 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:* |
| LTC3445EUF#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Triple Step Down 2.5V to 5.5V 24-Pin QFN EP T/R |
| LTC3445EUF#TRPBF | 功能描述:IC REG TRPL BUCK/LINEAR 24-QFN 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:* |
| 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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