參數(shù)資料
型號(hào)： LT3694-1EUFD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 2.6 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PQCC28
封裝： 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28
文件頁(yè)數(shù)： 8/28頁(yè)
文件大?。?/td> 276K
代理商： LT3694-1EUFD#TRPBF
LT3694/LT3694-1
16
36941fa
operating voltage of an LT3694 application is limited by
the minimum input voltage (4V) and by the maximum
duty cycle as outlined in a previous section. For proper
start-up, the minimum input voltage is also limited by the
boost circuit. If the input voltage is ramped slowly, or the
LT3694 is turned on with its EN/UVLO or TRK/SS pin when
the output is already in regulation, then the boost capacitor
may not be fully charged. Because the boost capacitor is
charged with the energy stored in the inductor, the circuit
will rely on some minimum load current to get the boost
circuit running properly. This minimum load will depend
on input and output voltages, and on the arrangement of
the boost circuit. The minimum load generally goes to
zero once the circuit has started. Figure 5 shows a plot
of input voltage to start and to run as a function of load
current. In many cases the discharged output capacitor
will present a load to the switcher, which will allow it to
start. The plots show the worst-case situation in which
VIN is ramping very slowly. For lower start-up voltage, the
boost diode can be tied to VIN, however, this restricts the
input range to one-half of the absolute maximum rating
of the BST pin.
At light loads, the inductor current becomes discontinu-
ous and the effective duty cycle can be very high. This
reduces the minimum input voltage to approximately
300mV above VOUT. At higher load currents, the inductor
current is continuous and the duty cycle is limited by the
maximum duty cycle of the LT3694, requiring a higher
input voltage to maintain regulation.
Internal Undervoltage Lockout
The LT3694 features an internal undervoltage lockout that
will shut off all three regulators if the input voltage drops
too low to maintain regulation of the internal circuitry. This
lockout trips when VIN drops below 3.8V (typ).
Enable and Programmable Undervoltage Lockout
The EN/UVLO pin provides both logic enable and pro-
grammable undervoltage lockout functions. There are
two thresholds on the EN/UVLO pin. The first threshold is
at 500mV (typ). When EN/UVLO is below this threshold,
the LT3694 is in complete shutdown and the quiescent
current drops below 2μA.
APPLICATIONS INFORMATION
Figure 5. The Minimum Input Voltage Depends on
Output Voltage, Load Current and Boost Circuit
36941 F05
LOAD CURRENT (A)
0.001
INPUT
VOL
TAGE
(V)
3.8
4.0
4.2
1
3.6
3.4
3.0
0.01
0.1
3.2
5.0
4.4
4.6
4.8 TO START
TO RUN
VOUT = 3.3V
fSW = 800kHz
LOAD CURRENT (A)
0.001
6.0
INPUT
VOL
TAGE
(V)
6.5
0.01
0.1
1
5.5
5.0
4.5
4.0
7.0
VOUT = 5V
fSW = 800kHz
TO RUN
TO START
相關(guān)PDF資料
PDF描述
LT3694IUFD#TRPBF 2.6 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PQCC28
LT3694IFE#PBF 2.6 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO20
LT3694-1IUFD#PBF 2.6 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PQCC28
LT3694IUFD#PBF 2.6 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PQCC28
LT3694-1IFE#PBF 2.6 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT3694-1IFEPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:36V, 2.6A Monolithic Buck Regulator With Dual LDO
LT3694-1IUFDPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:36V, 2.6A Monolithic Buck Regulator With Dual LDO
LT3694EFE#PBF 功能描述:IC REG TRPL BUCK/LINEAR 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開(kāi)關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無(wú) 帶監(jiān)控器:無(wú) 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
LT3694EFE#TRPBF 功能描述:IC REG TRPL BUCK/LINEAR 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開(kāi)關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無(wú) 帶監(jiān)控器:無(wú) 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
LT3694EFE-1#PBF 功能描述:IC REG TRPL BUCK/LINEAR 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開(kāi)關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無(wú) 帶監(jiān)控器:無(wú) 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
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