- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385502 > LT1959C (Linear Technology Corporation) RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS PDF資料下載
參數(shù)資料
| 型號： | LT1959C |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 292K |
| 代理商： | LT1959C |
6
LT1959
PI
FU
CTIO
N
S
U
U
FB:
The feedback pin is used to set output voltage using an
external voltage divider that generates 1.21V at the pin
with the desired output voltage. Three additional functions
are performed by the FB pin. When the pin voltage drops
below 0.8V, switch current limit is reduced. Below 0.7V
the external sync function is disabled and switching fre-
quency is reduced. See Feedback Pin Function section in
Applications Information for details.
BOOST:
The BOOST pin is used to provide a drive voltage,
higher than the input voltage, to the internal bipolar NPN
power switch. Without this added voltage, the typical
switch voltage loss would be about 1.5V. The additional
boost voltage allows the switch to saturate and voltage
loss approximates that of a 0.07
FET structure, but with
much smaller die area. Efficiency improves from 75% for
conventional bipolar designs to > 89% for these new parts.
V
IN
:
This is the collector of the on-chip power NPN switch.
This pin powers the internal circuitry and internal regula-
tor. At NPN switch on and off, high dI/dt edges occur on
this pin. Keep the external bypass and catch diode close to
this pin. All trace inductance on this path will create a
voltage spike at switch off, adding to the V
CE
voltage
across the internal NPN.
GND:
The GND pin connection needs consideration for
two reasons. First, it acts as the reference for the regulated
output, so load regulation will suffer if the “ground” end of
the load is not at the same voltage as the GND pin of the
IC. This condition will occur when load current or other
currents flow through metal paths between the GND pin
and the load ground point. Keep the ground path short
between the GND pin and the load and use a ground plane
when possible. The second consideration is EMI caused
by GND pin current spikes. Internal capacitance between
the V
SW
pin and the GND pin creates very narrow (<10ns)
current spikes in the GND pin. If the GND pin is connected
to system ground with a long metal trace, this trace may
radiate excess EMI. Keep the path between the input
bypass and the GND pin short. The GND pin of the SO-8
package is directly attached to the internal tab. This pin
should be attached to a large copper area to improve
thermal resistance.
V
SW
:
The switch pin is the emitter of the on-chip power
NPN switch. This pin is driven up to the input pin voltage
during switch on time. Inductor current drives the switch
pin negative during switch off time. Negative voltage is
clamped with the external catch diode. Maximum negative
switch voltage allowed is –0.8V.
SYNC:
(S08 Package Only) The sync pin is used to
synchronize the internal oscillator to an external signal. It
is directly logic compatible and can be driven with any
signal between 10% and 90% duty cycle. The synchroniz-
ing range is equal to initialoperating frequency, up to
1MHz. See Synchronizing section in Applications Infor-
mation for details. When not in use, this pin should be
grounded.
SHDN:
The shutdown pin is used to turn off the regulator
and to reduce input drain current to a few microamperes.
Actually, this pin has two separate thresholds, one at
2.38V to disable switching, and a second at 0.4V to force
complete micropower shutdown. The 2.38V threshold
functions as an accurate undervoltage lockout (UVLO).
This is sometimes used to prevent the regulator from
operating until the input votlage has reached a predeter-
mined level.
V
C
:
The V
C
pin is the output of the error amplifier and the
input of the peak switch current comparator. It is normally
used for frequency compensation, but can do double duty
as a current clamp or control loop override. This pin sits
at about 1V for very light loads and 2V at maximum load.
It can be driven to ground to shut off the regulator, but if
driven high, current must be limited to 4mA.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1959I | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1047 | Dual Micropower Chopper Stabilized Op Amp With Internal Capacitors(雙路微功耗斬波穩(wěn)定運(yùn)算放大器（帶內(nèi)部電容）) |
| LTC1049 | Low Power Chopper Stabilized Op Amp With Internal Capacitors(單路低功耗斬波穩(wěn)定運(yùn)算放大器（帶內(nèi)部電容）) |
| LTC1064-1 | Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter(低噪聲，８階，時(shí)鐘掃描橢圓形低通濾波器) |
| LTC1066-1 | 14-Bit DC Accurate Clock-Tunable, 8th Order Elliptic or Linear Phase Lowpass Filter(14位直流精度，時(shí)鐘可調(diào)，８階橢圓形或線性相位低通濾波器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1959CR | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1959CR#PBF | 功能描述:IC REG BUCK ADJ 4.5A D2PAK 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 |
| LT1959CR#TR | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1959CR#TRPBF | 功能描述:IC REG BUCK ADJ 4.5A D2PAK 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:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1959CS8 | 功能描述:IC REG BUCK ADJ 4.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。