參數(shù)資料
型號(hào)： LTC3765IMSE#TRPBF
廠(chǎng)商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝： LEAD FREE, PLASTIC, MSOP-16
文件頁(yè)數(shù)： 5/24頁(yè)
文件大?。?/td> 265K
代理商： LTC3765IMSE#TRPBF
LTC3765
13
3765f
APPLICATIONS INFORMATION
The maximum value of the RNDRV resistor is limited by
the 10A bias current pulled by NDRV that is required to
power the internal linear regulator circuit. When the VCC
supply is above a minimum voltage that is a function of
the MOSFET threshold, an internal charge pump provides
all of the NDRV bias current; however, when VCC is below
this voltage, the charge pump is not active and the NDRV
resistor must supply this current. Thus, a maximum value
ofRNDRVforthechargepumpstart-upcanbecalculatedas:
RNDRV <
VIN(MIN) –1.6VTH –1.2V
20A
These two equations result in a wide range of values for
RNDRV. For many applications, a 100k resistor will satisfy
these requirements.
The rate of charge of VCC from 0V to 8.5V is controlled
by the LTC3765 to be approximately 35s regardless of
the size of the capacitor connected to the VCC pin. The
chargingcurrentforthiscapacitorcanbeapproximatedas:
IC1=
8.5V
35s
C1
The external NMOS should be chosen so that the IC1
capacitor charging current in the equation above does
not exceed the safe operating area (SOA) of the NMOS.
Excessive values of C1 are unnecessary and should be
avoided. Typically values in the 1F to 10F range work
well. A standard 3V threshold NMOS should be used when
possibletobettertolerateahighvoltagestart-uptransient;
however, a logic-level NMOS may be used for applications
that require low voltage start-up. Since the NMOS is on
continuously only during the brief start-up period, a small
SOT-23 package can be used.
If an 8.5V to 14.5V supply is available in the system that
can be used to power VCC, the linear regulator is not
needed and should be disabled by tying NDRV to VCC.
The external supply should be connected to the VCC pin
through a series diode if the LTC3766 is configured to
overdrive VCC when it begins switching.
Low Input Voltage Start-Up
The minimum value of RNDRV is further constrained if low
voltage (VIN<10V)start-upisrequired.Inthisapplication,
the previous equation for the maximum value of RNDRV
must be satisfied to start the charge pump. Additionally,
the charge pump current flows through RNDRV to raise the
NDRVvoltageaboveVINsothattheexternalMOSFETcanbe
fully enhanced. RNDRV therefore needs to be large enough
that the limited charge pump current can raise the NDRV
voltage to this level. Lower threshold logic-level MOSFETs
are preferred for low voltage start-up not only because the
MOSFET requires a lower NDRV voltage above VIN, but
also because the charge pump current increases as the
NDRV-VCC difference decreases, which is approximately
the MOSFET threshold. For a given threshold voltage,
RNDRV should be chosen so that it meets the following
relationship, keeping in mind that the previous equation
for the maximum value of RNDRV must also be met.
RNDRV >
VTH(MAX)
5 – VTH(MAX)
100k
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參數(shù)描述
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LTC3765MPMSE#TRPBF 功能描述:IC CONTROLLER GATE DR 16MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:Direct Flux Limit™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC3766EGN#PBF 功能描述:IC CONTROLLER SYNCH 28-SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:Direct Flux Limit™, PolyPhase® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC3766EGN#TRPBF 功能描述:IC CONTROLLER SYNCH 28SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:Direct Flux Limit™, PolyPhase® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC3766EUFD#PBF 功能描述:IC CONTROLLER SYNCH 28QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:Direct Flux Limit™, PolyPhase® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
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