參數(shù)資料
型號(hào)： LTC3765IMSE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 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)： 4/24頁(yè)
文件大?。?/td> 265K
代理商： LTC3765IMSE#TRPBF
LTC3765
12
3765f
APPLICATIONS INFORMATION
RUN Pin Resistor Selection
Normal operation is enabled when the voltage on the RUN
pin rises above its 1.25V threshold. As shown in Figure3,
the RUN pin is typically used with an external resistive
divider as an accurate undervoltage lockout (UVLO) on
the VIN supply. A 5A current is pulled by the RUN pin
when it is below its threshold that, when combined with
the value chosen for R1, increases the UVLO hysteresis
beyond the internal minimum of 4%. When used in this
manner, the values for R1 and R2 can be calculated from
the desired rising and falling UVLO thresholds by the fol-
lowing equations:
R1
=
VIN(RISING) –1.042 VIN(FALLING)
5A
R2
=
1.2 R1
VIN(FALLING) –1.2
A 1nF capacitor in parallel with R2 is recommended to
filter out noise coupling from the high slew nodes to the
RUN pin. Be aware that the absolute maximum voltage on
the RUN pin is 12V. Therefore, the following relationship
betweenthemaximumVINvoltageexpectedandthefalling
VIN UVLO threshold must be satisfied:
VIN(MAX) < 10 VIN(FALLING)
Run/Stop control can also be implemented by connect-
ing a small NMOS to the RUN pin as shown in Figure 3.
Turning on the NMOS grounds the RUN pin and prevents
the LTC3765 from running.
The RUN pin is also used to sense the input voltage for
the Direct Flux Limit. A resistive divider from VIN must
be connected to the RUN pin for proper operation of the
Direct Flux Limit.
Linear Regulator
The linear regulator eliminates the long start-up times
associated with a conventional trickle charger by using
an external NMOS to quickly charge the capacitor con-
nected to the VCC pin. The typical configuration for the
linear regulator is shown in Figure 4.
The NDRV pin sinks up to 1mA of current through RNDRV
to regulate the voltage on VCC. The minimum value of
RNDRV can therefore be computed from:
RNDRV >
VIN(MAX) – 8.5V + VTH
(
)
1mA
where VTH is the threshold voltage of the external NMOS.
R1
R2
VIN
RUN/STOP
CONTROL
(OPTIONAL)
RUN
SGND
LTC3765
3765 F03
Figure 3. Resistive Voltage Divider for VIN UVLO
and Optional Run/Stop Control
RNDRV
CVCC
VIN
NDRV
VCC
SGND
LTC3765
3765 F04
Figure 4. Typical Linear Regulator Configuration
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相關(guān)代理商/技術(shù)參數(shù)
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LTC3765MPMSE#TRPBF 功能描述:IC CONTROLLER GATE DR 16MSOP RoHS:是 類別: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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