参数资料
型号: LT3686IDD#TRPBF
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封装: 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10
文件页数: 2/28页
文件大小: 509K
代理商: LT3686IDD#TRPBF
LT3686
10
3686fc
Input Voltage Range
TheinputvoltagerangefortheLT3686applicationsdepends
ontheoutputvoltageandontheabsolutemaximumratings
of the VIN and BOOST pins. The minimum input voltage
is determined by either the LT3686’s minimum operating
voltage of 3.6V, or by its maximum duty cycle.
Thedutycycleisthefractionoftimethattheinternalswitch
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.
The boost capacitor is charged with the energy stored in
the inductor, the circuit will rely on some minimum load
current 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
1.27V
– 1
R4 also sets the hysteresis voltage for the programmable
UVLO:
Hysteresis=R42.4A
OnceVINdropsbelowtheprogrammedvoltage,theLT3686
will enter a low quiescent current state (IQ ≈ 15A). To
shutdown the LT3686 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
3686 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
3686 F02
0
45
相关PDF资料
PDF描述
LT3688IFE#TRPBF SWITCHING REGULATOR, PDSO24
LT3688EUF#PBF SWITCHING REGULATOR, PQCC24
LT3688IFE#PBF SWITCHING REGULATOR, PDSO24
LT3688HFE#PBF SWITCHING REGULATOR, PDSO24
LT3688HFE#TRPBF SWITCHING REGULATOR, PDSO24
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