參數(shù)資料
型號(hào)： LTC3445EUF#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 0.8 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-24
文件頁(yè)數(shù)： 1/24頁(yè)
文件大小： 470K
代理商： LTC3445EUF#TR
1
LTC3445
3445fa
Buck Regulator
■
High Efficiency: Up to 93%
■ 600mA Output Current (VCC1 = 3V, VOUT = 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 VCC BATT
I2C
■
Standard (100kHz) or Fast Mode (400kHz)
■ 24-Lead (4mm
× 4mm) QFN Package
I2C 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.
The LTC
3445 contains a high efficiency monolithic syn-
chronous current mode buck regulator, two LDO regula-
tors, a PowerPath
TM controller and an I2CTM 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 I2C 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. VBACKUP is typically
a coin cell.
Typical supply current during operation is only 360
Aand
drops to 27
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.
Burst Mode is a registered trademark of Linear Technology Corporation.
PowerPath is a trademark of Linear Technology Corporation.
I2C 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
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
+
2.2
H
705k
604k
4.7
F
CER
4.7
F
CER
10
F
CER
1.3V
0.85V
TO 1.55V
3VTYP
VCC2
GND
LTC3445
VCC1
nBATT_FAULT
VCC1
BATTFAULT
4.7
F
CER
VCC BATT
VTRACK
3V
COIN
CELL
VBACKUP
LDO1
LDO1FB
LDO2
LDO2FB
SW
FB
RUN
SDA
I2C BUS
PWR_EN
VCC1 OR GND
SCL
ADD7
ADD6
PGOOD
VCC
nVCC_FAULT
VCC
20k
3445 TA01
503k
604k
10
F
CER
1.1V
VBACKUP
20k
VBACKUP
Efficiency and Power Loss
vs Load Current, VCC1 = 3.6V
LOAD CURRENT (mA)
30
EFFICIENCY
(%)
POWER
LOSS
(mW)
90
100
20
10
80
50
70
60
40
0.1
10
100
1000
3445 TA01b
0
1
DAC MAX
DAC MIN
DAC MAX
100
1000
10
1.0
0.1
EFFICIENCY
POWER LOSS
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參數(shù)描述
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