参数资料
型号: LTC3447EDD#PBF
厂商: Linear Technology
文件页数: 1/16页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 0.6A 10DFN
标准包装: 121
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.69 V ~ 2.05 V
输入电压: 2.5 V ~ 5.5 V
PWM 型: 电流模式,混合
频率 - 开关: 1MHz
电流 - 输出: 600mA
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 10-WFDFN 裸露焊盘
包装: 管件
供应商设备封装: 10-DFN(3x3)
产品目录页面: 1334 (CN2011-ZH PDF)
LTC3447
I 2 C Controllable Buck
Regulator in 3mm × 3mm DFN
FEATURES
DESCRIPTIO
I 2 C Programmable Output with 21.6mV Resolution
Overtemperature Protected
High Ef?ciency: Up to 93%
Very Low Quiescent Current: Only 33μA
600mA Output Current at V IN = 3V
2.5V to 5.5V Input Voltage Range
1MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Stable with Ceramic Capacitors
Shutdown Mode Draws <1μA Supply Current
±2% Output Voltage Accuracy
Standard (100kHz) or Fast Mode (400kHz) I 2 C
6-Bit Voltage DAC (0.69V to 2.05V)
Disable Burst Mode Operation
Enable Power Good Blanking
Optional External Start-Up Resistors
Soft-Start
10 Lead, 3mm × 3mm DFN Package
The LTC ? 3447 is a high ef?ciency monolithic synchronous
current mode buck regulator. Using an I 2 C interface, the
output voltage can be set between 0.69V and 2.05V using
an internal 6-bit DAC.
The buck regulator has optional external feedback resis-
tors that can be used for setting the initial start up voltage.
The feedback voltage reference for this start-up option
is 0.6V. Once the voltage DAC is updated via the I 2 C, the
buck regulator switches from external to internal feedback
resistors. When there are no external resistors, the default
start-up voltage is 1.38V.
The switching frequency is internally set at 1MHz, al-
lowing the use of small surface mount inductors and
capacitors.
In Burst Mode ? operation, supply current is only 33μA,
dropping to <1μA in shutdown. The 2.5V to 5.5V input
voltage range makes the LTC3447 ideally suited for single
cell Li-Ion battery-powered applications. 100% duty cycle
Distributed Power Supplies
Notebook Computers
PDAs and Other Handheld Devices
APPLICATIO  S
, LTC and LT 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.
capability provides low dropout operation, extending
battery life in portable systems. Automatic Burst Mode
operation increases ef?ciency at light loads, further ex-
tending battery life.
The internal synchronous switch increases ef?ciency and
eliminates the need for an external Schottky diode.
TYPICAL APPLICATIO
V IN
2.5V TO 5.5V C2
4.7 μ F
CERAMIC
V IN
RPU1
100
90
80
Ef?ciency and Power Loss vs
Load Current (V IN = 3.6V)
1000
I 2 C
V CCD
10k 10k
SDA
PWREN
C3
4.7 μ F
RUN
V CCD
SDA
V IN
PGOOD
LTC3447
SW
V OUT
20k
L1
3.3 μ H
C1
10 μ F
V OUT
0.69V
TO 2.05V
AT 600mA*
R1
100k
70
60
50
40
30
100
10
SCL
* 600mA AT V IN = 3V
SCL FB
GND
EXPOSED PADDLE
TO GROUND
R2
49.9k
3447 TA01
20
10
0
1
PULSE SKIP EFFICIENCY
Burst Mode EFFICIENCY
LOSS
10 100 1000
LOAD CURRENT (mA)
3447 TA01b
1
3447f
1
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