參數(shù)資料
型號(hào)： LTC1709
廠商： Linear Technology Corporation
元件分類(lèi)： 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(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 17/28頁(yè)
文件大小： 319K
代理商： LTC1709
17
LTC1709-7
Topside MOSFET Driver Supply (C
B
,D
B
) (Refer to
Functional Diagram)
External bootstrap capacitors C
B1
and C
B2
connected to
the BOOST1 and BOOST2 pins supply the gate drive
voltages for the topside MOSFETs. Capacitor C
B
in the
Functional Diagram is charged though diode D
B
from
INTV
CC
when the SW pin is low. When the topside MOSFET
turns on, the driver places the C
B
voltage across the gate-
source of the desired MOSFET. This enhances the MOSFET
and turns on the topside switch. The switch node voltage,
SW, rises to V
IN
and the BOOST pin rises to V
IN
+ V
INTVCC
.
The value of the boost capacitor C
B
needs to be 30 to 100
times that of the total input capacitance of the topside
MOSFET(s). The reverse breakdown of D
B
must be greater
than V
IN(MAX).
The final arbiter when defining the best gate drive ampli-
tude level will be the input supply current. If a change is
made that decreases input current, the efficiency has
improved. If the input current does not change then the
efficiency has not changed either.
Output Voltage
The LTC1709-7 has a true remote voltage sense capablity.
The sensing connections should be returned from the load
back to the differential amplifier’s inputs through a com-
mon, tightly coupled pair of PC traces. The differential
amplifier corrects for DC drops in both the power and
ground paths. The differential amplifier output signal is
APPLICATIU
W
U
U
divided down and compared with the internal precision
0.8V voltage reference by the error amplifier.
Output Voltage Programming
The output voltage is digitally programmed as defined in
Table 1 using the VID0 to VID4 logic input pins. The VID
logic inputs program a precision, 0.25% internal feedback
resistive divider. The LTC1709-7 has an output voltage
range of 0.9V to 2V in 25mV and 50mV steps.
Between the ATTENOUT
pin and ground is a variable
resistor, R1, whose value is controlled by the five VID input
pins (VID0 to VID4). Another resistor, R2, between the
ATTENIN and the ATTENOUT pins completes the resistive
divider. The output voltage is thus set by the ratio of
(R1+R2) to R1.
Each VID digital input is pulled up by a 40k resistor in
series with a diode from V
BIAS
. Therefore, it must be
grounded to get a digital low input, and can be either
floated or connected to V
BIAS
to get a digital high input. The
series diode is used to prevent the digital inputs from
being damaged or clamped if they are driven higher than
V
BIAS
. The digital inputs accept CMOS voltage levels.
V
BIAS
is the supply voltage for the VID section. It is
normally connected to INTV
CC
but can be driven from
other sources. If it is driven from another source, that
source mustbe in the range of 2.7V to 5.5V and mustbe
alive prior to enabling the LTC1709-7.
Figure 5a. Secondary Output Loop with EXTV
CC
Connection
Figure 5b. Capacitive Charge Pump for EXTV
CC
17097 F05a
V
IN
TG1
N-CH
1N4148
N-CH
BG1
FCB
R6
R5
PGND
LTC1709-7
SW1
EXTV
CC
OPTIONAL EXTV
CC
CONNECTION
5V < V
SEC
< 7V
T1
R
SENSE
V
SEC
V
OUT
V
IN
+
C
IN
+
1
μ
F
+
C
OUT
17097 F05b
V
IN
TG1
N-CH
N-CH
BG1
PGND
LTC1709-7
SW1
EXTV
CC
L1
R
SENSE
BAT85
BAT85
BAT85
0.22
μ
F
V
OUT
V
IN
+
C
IN
+
+
C
OUT
VN2222LL
相關(guān)PDF資料
PDF描述
LTC1709EG-8 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC1709EG-9 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC1709-8 CHOKE COIL 2.7UH 950MA SMD
LTC1709-9 CHOKE COIL 33UH 260MA SMD
LTC1709EG CHOKE COIL 6.8UH 620MA SMD
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1709EG 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 類(lèi)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1709EG#PBF 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類(lèi)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:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LTC1709EG#TR 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 類(lèi)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1709EG#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類(lèi)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:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LTC1709EG7 制造商:Linear Technology 功能描述:
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。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(gòu)。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(gòu)

我的聯(lián)系方式

*
*
*