參數(shù)資料
型號(hào)： LTC1625I
廠商： Linear Technology Corporation
英文描述： LinCMOS(TM) Timer 8-SOIC
中文描述： 無檢測電阻商標(biāo)電流模式同步降壓型開關(guān)穩(wěn)壓器
文件頁數(shù)： 13/24頁
文件大?。?/td> 454K
代理商： LTC1625I
13
LTC1625
APPLICATIO
S I
N
FOR
ATIO
U
High input voltage applications in which large MOSFETs
are being driven at high frequencies may cause the LTC1625
to exceed its maximum junction temperature rating. Most
of the supply current drives the MOSFET gates unless an
external EXTV
CC
source is used. The junction temperature
can be estimated from the equations given in Note 2 of the
Electrical Characteristics. For example, the LTC1625CGN
is limited to less than 14mA from a 30V supply:
T
J
= 70
°
C + (14mA)(30V)(130
°
C/W) = 125
°
C
To prevent the maximum junction temperature from being
exceeded, the input supply current must be checked when
operating in continuous mode at high V
IN
.
W
U
EXTV
CC
Connection
The LTC1625 contains an internal P-channel MOSFET
switch connected between the EXTV
CC
and INTV
CC
pins.
Whenever the EXTV
CC
pin is above 4.7V the internal 5.2V
regulator shuts off, the switch closes and INTV
CC
power is
supplied via EXTV
CC
until EXTV
CC
drops below 4.5V. This
allows the MOSFET gate drive and control power to be
derived from the output or other external source during
normal operation. When the output is out of regulation
(start-up, short circuit) power is supplied from the internal
regulator. Do not apply greater than 7V to the EXTV
CC
pin
and ensure that EXTV
CC
≤
V
IN
.
Significant efficiency gains can be realized by powering
INTV
CC
from the output, since the V
IN
current supplying
the driver and control currents will be scaled by a factor of
Duty Cycle/Efficiency. For 5V regulators this simply means
connecting the EXTV
CC
pin directly to V
OUT
. However, for
3.3V and other lower voltage regulators, additional cir-
cuitry is required to derive INTV
CC
power from the output.
The following list summarizes the four possible connec-
tions for EXTV
CC
:
1. EXTV
CC
left open (or grounded). This will cause INTV
CC
to be powered from the internal 5.2V regulator resulting
in an efficiency penalty of up to 10% at high input
voltages.
2. EXTV
CC
connected directly to V
OUT
. This is the normal
connection for a 5V regulator and provides the highest
efficiency.
3. EXTV
CC
connected to an output-derived boost network.
For 3.3V and other low voltage regulators, efficiency
gains can still be realized by connecting EXTV
CC
to an
output-derived voltage which has been boosted to
greater than 4.7V. This can be done with either an
inductive boost winding as shown in Figure 5a or a
capacitive charge pump as shown in Figure 5b.
4. EXTV
CC
connected to an external supply. If an external
supply is available in the 5V to 7V range (EXTV
CC
< V
IN
),
it may be used to power EXTV
CC
providing it is compat-
ible with the MOSFET gate drive requirements.
V
IN
TK
LTC1625
EXTV
CC
SGND
FCB
TG
SW
OPTIONAL
EXTV
CONNECTION
5V < V
SEC
< 7V
R3
R4
1625 F05a
T1
1:N
BG
PGND
+
C
SEC
1
μ
F
V
OUT
V
SEC
V
IN
+
C
IN
1N4148
+
C
OUT
Figure 5a: Secondary Output Loop and EXTV
CC
Connection
V
IN
TK
LTC1625
EXTV
CC
V
PUMP
≈
2(V
OUT
– V
D
)
TG
SW
1625 F05b
L1
BG
PGND
+
C
OUT
V
OUT
BAT85
BAT85
BAT85
VN2222LL
V
IN
+
C
IN
+
1
μ
F
0.22
μ
F
Figure 5b: Capacitive Charge Pump for EXTV
CC
相關(guān)PDF資料
PDF描述
LTC1625IS RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC1625 Synchronous Step-Down Switching Regulator(3.3V輸出，同步步降開關(guān)穩(wěn)壓器)
LTC1626CS LinCMOS(TM) Timer 8-PDIP
LTC1626 Low Voltage, High Efficiency Step-Down DC/DC Converter(低壓，高效率，步降DC/DC變換器)
LTC1627 Monolithic Synchronous Step-Down Switching Regulator(單片同步步降開關(guān)穩(wěn)壓器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1625IGN 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1625IGN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
LTC1625IGN#TR 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1625IGN#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1625IGNPBF 制造商:Linear Technology 功能描述:No RSENSE Current Mode Regulator SSOP16
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*