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參數(shù)資料
| 型號： | LT1676 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Wide Input Range, High Efficiency, Step-Down Switching Regulator(寬輸入范圍，高效率，步降開關穩(wěn)壓器) |
| 中文描述： | 輸入范圍寬，高效率，降壓型開關穩(wěn)壓器（寬輸入范圍，高效率，步降開關穩(wěn)壓器） |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 140K |
| 代理商： | LT1676 |
5
LT1676
PI
FU
CTIO
N
S
U
U
SHDN (Pin 1):
When pulled below the shutdown mode
threshold, nominally 0.30V, this pin turns off the regula-
tor and reduces V
IN
input current to a few tens of micro-
amperes (shutdown mode).
When this pin is held above the shutdown mode thresh-
old, but below the lockout threshold, the part will be
operational with the exception that output switching
action will be inhibited (lockout mode). A user-adjustable
undervoltage lockout can be implemented by driving this
pin from an external resistor divider to V
IN
. This action is
logically “ANDed” with the internal UVLO, set at nominally
6.7V, such that minimum V
IN
can be increased above
6.7V, but not decreased (see Applications Information).
If unused, this pin should be left open. However, the high
impedance nature of this pin renders it susceptible to
coupling from the high speed V
SW
node, so a small
capacitor to ground, typically 100pF or so is recom-
mended when the pin is left “open.”
V
CC
(Pin 2):
This pin is used to power the internal control
circuitry off of the switching supply output. Proper use of
this pin enhances overall power supply efficiency. During
start-up conditions, internal control circuitry is powered
directly from V
IN
. If the output capacitor is located more
than an inch from the V
CC
pin, a separate 0.1
μ
F bypass
capacitor to ground may be required right at the pin.
V
SW
(Pin 3):
This is the emitter node of the output switch
and has large currents flowing through it. This node
moves at a high dV/dt rate, especially when in “boost”
mode. Keep the traces to the switching components as
short as possible to minimize electromagnetic radiation
and voltage spikes.
GND (Pin 4):
This is the device ground pin. The internal
reference and feedback amplifier are referred to it. Keep
the ground path connection to the FB divider and the V
C
compensation capacitor free of large ground currents.
V
IN
(Pin 5):
This is the high voltage supply pin for the
output switch. It also supplies power to the internal control
circuitry during start-up conditions or if the V
CC
pin is left
open. A high quality bypass capacitor that meets the input
ripple current requirements is needed here. (See Applica-
tions Information.)
SYNC (Pin 6):
Pin used to synchronize internal oscillator
to the external frequency reference. It is directly logic
compatible and can be driven with any signal between
10% and 90% duty cycle. The sync function is internally
disabled if the FB pin voltage is low enough to cause
oscillator slowdown. If unused, this pin should be grounded.
FB (Pin 7):
This is the inverting input to the feedback
amplifier. The noninverting input of this amplifier is inter-
nally tied to the 1.24V reference. This pin also slows down
the frequency of the internal oscillator when its voltage is
abnormally low, e.g., 2/3 of normal or less. This feature
helps maintain proper short-circuit protection.
V
C
(Pin 8):
This is the control voltage pin which is the
output of the feedback amplifier and the input of the
current comparator. Frequency compensation of the over-
all loop is effected by placing a capacitor, (or in most cases
a series RC combination) between this node and ground.
SWOFF
1676 TD01
BOOST
SWON
SWDR
0
V
IN
V
SW
SWOFF
1676 TD02
BOOST
SWON
SWDR
0
V
IN
V
SW
High dV/dt Mode
Low dV/dt Mode
TI
M
I
G DIAGRA
S
U
W
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1676C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Wide Input Range, High Efficiency, Step-Down Switching Regulator |
| LT1676CN8 | 功能描述:IC REG BUCK ADJ 0.7A 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 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: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) 供應商設備封裝:8-SOIC |
| LT1676CN8#PBF | 功能描述:IC REG BUCK ADJ 0.7A 8DIP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 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: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) 供應商設備封裝:8-SOIC |
| LT1676CS8 | 功能描述:IC REG BUCK ADJ 0.7A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 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: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) 供應商設備封裝:8-SOIC |
| LT1676CS8#PBF | 功能描述:IC REG BUCK ADJ 0.7A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝: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: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) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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