參數(shù)資料
型號(hào)： LTC1702I
廠商： Linear Technology Corporation
元件分類： 通用總線功能
英文描述： Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70
中文描述： 雙550kHz的同步二相開(kāi)關(guān)穩(wěn)壓器控制器
文件頁(yè)數(shù)： 25/36頁(yè)
文件大小： 350K
代理商： LTC1702I
25
LTC1702
The FAULT pin is an additional open-drain output that
indicates if one or both of the outputs has exceeded 15%
of its programmed output voltage. FAULT includes an
internal 10
μ
A pull-up to V
CC
and does not require an
external pull-up to interface to standard logic. FAULT pulls
low in normal operation, and releases when a overvoltage
fault is detected.
When an overvoltage fault occurs, an internal latch sets
and FAULT goes high, disabling the LTC1702 until the
latch is cleared by recycling the power or pulling both
RUN/SS pins low simultaneously. Alternately, the FAULT
pin can be pulled back low externally with an open-
collector/open-drain device or an NFET or NPN, which will
allow the LTC1702 to resume normal operation, but will
not reset the latch. If the pull-down is later removed, the
LTC1702 will latch off again unless the latch is reset by
cycling the power or RUN/SS pins.
Note that both the PGOOD pins and the FAULT pin monitor
the output voltages by watching the FB pins. During
normal operation, each FB pin is held at a virtual ground by
the feedback amplifier, and changes at the output will not
appear at FB. This is not an issue with a properly designed
circuit, since the virtual ground at FB implies that the
output voltage is under control. If the feedback amplifier
loses control of the output, the virtual ground disappears
and the PGOOD circuit can see any output changes. This
occurs whenever the soft-start or current limit circuits are
active, whenever the MIN or MAX comparators are active,
or any time the feedback amplifier output (the COMP pin)
hits a rail or is in slew limit. Since the MAX comparator will
engage well before the output reaches the +15% fault
level, the FAULT output is largely unaffected by the virtual
ground at FB.
OPTIMIZING PERFORMANCE
2-Step Conversion
The LTC1702 is ideally suited for use in 2-step conversion
systems. 2-step systems use a primary regulator to con-
vert the input power source (batteries or AC line voltage)
APPLICATIO
S I
N
FOR
ATIO
U
W
U
with 10mV of hysteresis, allowing fairly precise control of
the auxiliary voltage. If the LTC1702 is in discontinuous or
Burst Mode operation and the auxiliary output voltage
drops, the FCB pin will trip and the LTC1702 will resume
continuous operation regardless of the load on the main
output. The FCB pin removes the requirement that power
must be drawn from the inductor primary in order to
extract power from the auxiliary windings. With the loop in
continuous mode, the auxiliary outputs may be loaded
without regard to the primary load. Note that if the LTC1702
is already running in continuous mode and the auxiliary
output drops due to excessive loading, no additional
action can be taken by the LTC1702 to regulate the
auxiliary output.
POWER GOOD/FAULT FLAGS
The PGOOD pins report the status of the output voltage at
their respective outputs. Each is an open-drain output that
pulls low until the FB pin rises to (V
REF
– 5%), indicating
that the output voltage has risen to within 5% of the
programmed output voltage. Each PGOOD pin can inter-
face directly to standard logic inputs if an appropriate pull-
up resistor is added, or the two pins can be tied together
with a single pull-up to give a “both good” signal. Each
PGOOD pin includes an internal 100
μ
s delay to prevent
glitches at the output from indicating false PGOOD
signals.
Figure 13. Regulating an Auxiliary Output with the FCB Pin
+
TG
LTC1702
BG
FCB
C
OUT
R
FCB1
+
C
OUT(AUX)
V
OUT(AUX)
1702 F08
+
C
IN
QT
QB
V
OUT
V
IN
R
FCB2
相關(guān)PDF資料
PDF描述
LTC1702IGN Dual 550kHz Synchronous 2-Phase Switching Regulator Controller
LTC1706-85 VID Voltage Programmer for Intel VRM 8.5
LTC1706EMS-85 VID Voltage Programmer for Intel VRM 8.5
LTC1706CS8-19 VID Voltage Programmer
LTC1706C-19 Circular Connector; Body Material:Aluminum; Series:PT06; No. of Contacts:18; Connector Shell Size:14; Connecting Termination:Crimp; Circular Shell Style:Straight Plug; Circular Contact Gender:Pin; Insert Arrangement:14-18
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1702IGN 功能描述:IC REG CTRLR BUCK PWM VM 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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:LM1771SSDX
LTC1702IGN#PBF 功能描述:IC REG CTRLR BUCK PWM VM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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:LM1771SSDX
LTC1702IGN#TR 功能描述:IC REG CTRLR BUCK PWM VM 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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:LM1771SSDX
LTC1702IGN#TRPBF 功能描述:IC REG CTRLR BUCK PWM VM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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:LM1771SSDX
LTC1703CG 功能描述:IC REG SW DUAL SYNC VID 28SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
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

*
*
*