参数资料
型号: LTC3445EUF#PBF
厂商: Linear Technology
文件页数: 11/24页
文件大小: 475K
描述: IC REG TRPL BUCK/LINEAR 24-QFN
标准包装: 91
拓扑: 降压(降压)(1),线性(LDO)(2)
功能: 任何功能
输出数: 3
频率 - 开关: 1.5MHz
电压/电流 - 输出 1: 0.85 V ~ 1.55 V,600mA
电压/电流 - 输出 2: 可调至0.6V,50mA
电压/电流 - 输出 3: 可调至0.6V,50mA
带 LED 驱动器:
带监控器:
带序列发生器:
电源电压: 2.5 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-WFQFN 裸露焊盘
供应商设备封装: 24-QFN 裸露焊盘(4x4)
包装: 管件
产品目录页面: 1334 (CN2011-ZH PDF)
11
LTC3445
3445fa
TI I G DIAGRA
W
W
t
BUF
t
SUSTO
3445 TD
t
HD(STA)
t
HD(DAT)
t
SU(STA)
t
SU(DAT)
t
LOW
t
HIGH
t
r
t
f
t
HD(STA)
SCL
SDA
START
CONDITION
REPEATED START
CONDITION
STOP
CONDITION
START
CONDITION
I
2
C Fast Mode Timing Specifications (for Reference)
SYMBOL   PARAMETER
MIN   TYP   MAX    UNITS
f
I2C(MAX)
Maximum I
2
C Operating Frequency
0
400
kHz
t
BUF
Bus Free Time Between Stop and Start Condition
1.3
t
HD(RSTA)
Hold Time After (Repeated) Start Condition
0.6
t
SU(RSTA)
Repeated Start Condition Setup Time
0.6
t
SU(STOP)
Stop Condition Setup Time
0.6
t
HD(DAT)
Data Hold Time
0
0.9
ns
t
SU(DAT)
Data Setup Time
100
ns
t
LOW
Clock Low Period
1.3
t
HIGH
Clock High Period
0.6
t
SP
Pulse Width of Spikes Suppressed by Input Filter
0
50
ns
t
f
Clock, Data Fall Time (Note 1)
20 + 0.1
300
ns
" C
B
tr
Clock, Data Rise Time (Note 1)
20 + 0.1
300
ns
" C
B
Note 1: C
B
 = Capacitance of one bus line.
OPERATIO
(refer to Figure 1)
BUCK REGULATOR
Main Control Loop
The LTC3445 uses a constant or spread spectrum fre-
quency, current mode step-down architecture (Figure 2).
Both the main (P-channel MOSFET) and synchronous
(N-channel MOSFET) switches are internal. During normal
operation, the internal top power MOSFET is turned on
each cycle when the oscillator sets the RS latch, and
turned off when the current comparator, I
COMP
, resets the
RS latch. The peak inductor current at which I
COMP
 resets
the RS latch is controlled by the output of error amplifier
EA. When the load current increases, it causes a slight
decrease in the feedback voltage, FB, relative to an internal
reference voltage, which in turn, causes the EAs output
voltage to increase until the average inductor current
matches the new load current. While the top MOSFET is
off, the bottom MOSFET is turned on until either the
inductor current starts to reverse, as indicated by the
current reversal comparator I
RCMP
, or the beginning of the
next clock cycle.
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