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參數(shù)資料
| 型號(hào)： | LT3681EDE#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.4 A SWITCHING REGULATOR, 3100 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | 4 X 3 MM, PLASTIC, DFN-14 |
| 文件頁數(shù)： | 23/24頁 |
| 文件大?。?/td> | 367K |
| 代理商： | LT3681EDE#TR |
LT3681
8
3681f
The LT3681 is a constant frequency, current mode step-
down regulator. An oscillator, with frequency set by RT,
sets an RS ip-op, turning on the internal power switch.
An amplier and comparator monitor the current owing
between the VIN and SW pins, turning the switch off when
this current reaches a level determined by the voltage at
VC. An error amplier measures the output voltage through
an external resistor divider tied to the FB pin and servos
the VC pin. If the error amplier’s output increases, more
current is delivered to the output; if it decreases, less cur-
rent is delivered. An active clamp on the VC pin provides
current limit. The VC pin is also clamped to the voltage on
the RUN/SS pin; soft-start is implemented by generating a
voltage ramp at the RUN/SS pin using an external resistor
and capacitor.
An internal regulator provides power to the control cir-
cuitry. The bias regulator normally draws power from the
VIN pin, but if the BIAS pin is connected to an external
voltage higher than 3V bias power will be drawn from the
external source (typically the regulated output voltage).
This improves efciency. The RUN/SS pin is used to place
the LT3681 in shutdown, disconnecting the output and
reducing the input current to less than 1A.
The switch driver operates from either the input or from
the BOOST pin. An external capacitor is used to generate
a voltage at the BOOST pin that is higher than the input
supply. This allows the driver to fully saturate the internal
bipolar NPN power switch for efcient operation.
To further optimize efciency, the LT3681 automatically
switches to Burst Mode operation in light load situations.
Between bursts, all circuitry associated with controlling
the output switch is shut down reducing the input supply
current to 55A in a typical application.
The oscillator reduces the LT3681’s operating frequency
when the voltage at the FB pin is low. This frequency
foldback helps to control the output current during startup
and overload.
The LT3681 contains a power good comparator which trips
when the FB pin is at 91% of its regulated value. The PG
output is an open-collector transistor that is off when the
output is in regulation, allowing an external resistor to pull
the PG pin high. Power good is valid when the LT3681 is
enabled and VIN is above 3.6V.
The LT3681 integrates a high quality, 36V, 2A power
Schottky diode to reduce the overall solution size.
OPERATION
BLOCK DIAGRA
W
+
–
+
–
+
–
OSCILLATOR
300kHz–2.8MHz
BurstMode
DETECT
VC CLAMP
SOFT-START
SLOPE COMP
INTERNAL 1.265V REF
R
VIN
BIAS
RUN/SS
BOOST
SW
SWITCH
LATCH
VC
VOUT
C2
C3
CF
L1
DC
DA
DISABLE
CC
RC
BD
RT
R2
ERROR AMP
R1
FB
RT
C1
PG
1.12V
S
Q
5
3681 BD
13
2
14
6
1
10
11
12
9
16
8
5
GND
15
GND
7
GND
43
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT3681EDE | 4.4 A SWITCHING REGULATOR, 3100 kHz SWITCHING FREQ-MAX, PDSO14 |
| LT3686AEMSE#PBF | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO12 |
| LT3686AHMSE#TRPBF | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO12 |
| LT3686AHMSE#PBF | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO12 |
| LT3686AIMSE#TRPBF | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO12 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3682 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:42V, 750mA Step-Down Regulator with 2.5μA |
| LT3682EDD#PBF | 功能描述:IC REG BUCK ADJ 1A 12DFN 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:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT3682EDD#TRPBF | 功能描述:IC REG BUCK ADJ 1A 12DFN 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:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3682EDD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A Micropower Step-Down |
| LT3682EDD-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A Micropower Step-Down |
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