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參數(shù)資料
| 型號(hào)： | LTC3409 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | DRAM |
| 英文描述： | 64 x 18 3.3-V asynchronous FIFO memory 56-SSOP 0 to 70 |
| 中文描述： | 600mA的低輸入電壓降壓穩(wěn)壓器x 3mm DFN封裝采用3mm |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 246K |
| 代理商： | LTC3409 |
8
LTC3409
3409f
FU
W
+
–
+
–
+
–
EA
+
OVDET
–
+
–
I
RCMP
+
–
I
COMP
1
7
RUN
PLL
SLOPE
COMP
OSC
0.613V
REFERENCE
SHUTDOWN
OV
0.675
0.4V
0.65V
SLEEP
EN
V
IN
V
FB
5
MODE
8
SYNC
BURST
V
IN
S
R
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
SOFT-
START
Q
Q
5
3, 4
SW
6
GND
3409 FD
2
OPERATIOU
Main Control Loop
The LTC3409 uses a constant frequency, current mode
step-down architecture. 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 com-
parator, 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. The V
FB
pin, described in
the Pin Functions section, allows EA to receive an output
feedback voltage from an external resistive divider. When
the load current increases, it causes a slight decrease in
the feedback voltage relative to the 0.613V reference,
which in turn, causes the EA amplifier’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.
Comparator OVDET guards against transient overshoots
>10% by turning the main switch off and keeping it off until
the transient has ended.
Burst Mode Operation
The LTC3409 is capable of Burst Mode operation in which
the internal power MOSFETs operate intermittently based
on load demand. To enable Burst Mode operation, simply
connect the MODE pin to GND. To disable Burst Mode
operation and enable PWM pulse skipping mode, connect
the MODE pin to V
IN
or drive it with a logic high (V
MODE
>1.1V). In this mode, the efficiency is lower at light loads,
but becomes comparable to Burst Mode operation when
the output load exceeds 30mA. The advantage of pulse
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| LTC3409A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA Low VIN Buck Regulator in 3mm × 3mm DFN |
| LTC3409AEDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA Low VIN Buck Regulator in 3mm × 3mm DFN |
| LTC3409AEDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC3409AEDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC3409AIDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA Low VIN Buck Regulator in 3mm × 3mm DFN |
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