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參數(shù)資料
| 型號： | LT3686AIMSE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO12 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-12 |
| 文件頁數(shù)： | 2/30頁 |
| 文件大?。?/td> | 504K |
| 代理商： | LT3686AIMSE#TRPBF |
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LT3686A
10
3686afa
Input Voltage Range
The input voltage range for the LT3686A applications
depends on the output voltage and on the absolute maxi-
mum ratings of the VIN and BOOST pins. The minimum
input voltage is determined by either the LT3686A’s
minimum operating voltage of 3.6V, or by its maximum
duty cycle.
The duty cycle is the fraction of time that the internal
switch is on and is determined by the input and output
voltages:
DC
=
VOUT + VD
VIN – VSW + VD
Where VD is the forward voltage drop of the catch diode
(~0.4V) and VSW is the voltage drop of the internal switch
(~0.67V at maximum load). This leads to a minimum input
voltage of:
VIN(MIN) =
VOUT + VD
DCMAX
– VD + VSW
DCMAX can be adjusted with frequency.
Theboostcapacitorischargedwiththeenergystoredinthe
inductor,thecircuitwillrelyonsomeminimumloadcurrent
to sustain the charge across the boost capacitor.
ApplicAtions inForMAtion
FB Resistor Network
The output voltage is programmed with a resistor divider
between the output and the FB pin. Choose the 1% resis-
tors according to:
R1=R2
VOUT
0.8V
– 1
R2 should be 20k or less to avoid bias current errors.
Reference designators refer to the Block Diagram.
Programmable Undervoltage Lockout
The EN/UVLO pin can be programmed by an external re-
sistor divider between VIN and the EN/UVLO pin. Choose
the resistors according to:
R4
= R5
VIN
1.28V
– 1
R4 also sets the hysteresis voltage for the programmable
UVLO:
Hysteresis=R42.4A
Once VIN drops below the programmed voltage, the
LT3686A will enter a low quiescent current state (Iq ≈
15A). To shutdown the LT3686A completely (Iq < 1A),
reduce EN/UVLO pin voltage to below 0.4V.
Figure 1. IQ vs VEN/UVLO (VIN = 10V)
Figure 2. EN/UVLO Pin Current
EN/UVLO (V)
1
10
I Q
(A)
1000
100
0
1
2
3
4
5
6
7
3686A F01
0.1
10000
8
EN/UVLO (V)
5
10
EN/UVLO
(A)
20
25
30
35
40
15
0
10
20
30
40
50
3686A F02
0
45
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3686EDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:37V/1.2A Step-Down Regulator in 3mm × 3mm DFN |
| LT3686EDD#PBF | 功能描述:IC REG BUCK ADJ 1.2A 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3686EDD#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3686EDDPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:37V/1.2A Step-Down Regulator in 3mm × 3mm DFN |
| LT3686EDDTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:37V/1.2A Step-Down Regulator in 3mm × 3mm DFN |
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