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參數(shù)資料
| 型號(hào)： | LTC3445EUF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | I2C Controllable Buck Regulator with Two LDOs in a 4mm ?4mm QFN |
| 中文描述： | 0.8 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-24 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 465K |
| 代理商： | LTC3445EUF |
11
LTC3445
3445fa
TIW
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
f
I2C(MAX)
t
BUF
Bus Free Time Between Stop and Start Condition
t
HD(RSTA)
Hold Time After (Repeated) Start Condition
t
SU(RSTA)
Repeated Start Condition Setup Time
t
SU(STOP)
Stop Condition Setup Time
t
HD(DAT)
Data Hold Time
t
SU(DAT)
Data Setup Time
t
LOW
Clock Low Period
t
HIGH
Clock High Period
t
SP
Pulse Width of Spikes Suppressed by Input Filter
t
f
Clock, Data Fall Time (Note 1)
MIN
0
1.3
0.6
0.6
0.6
0
100
1.3
0.6
0
20 + 0.1
C
B
20 + 0.1
C
B
TYP
MAX
400
UNITS
kHz
Maximum I
2
C Operating Frequency
μ
s
μ
s
μ
s
μ
s
ns
ns
μ
s
μ
s
ns
ns
0.9
50
300
tr
Clock, Data Rise Time (Note 1)
300
ns
Note 1:
C
B
= Capacitance of one bus line.
OPERATIOU
BUCK REGULATOR
(refer to Figure 1)
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 EA’s 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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| 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(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:* |
| 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(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:* |
| LTC3446 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Monolithic Buck Regulator with Dual VLDO Regulators |
| LTC3446EDE | 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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