參數(shù)資料
型號(hào)： LTC3609IWKG#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PQCC52
封裝： 8 X 7 MM, LEAD FREE, PLASTIC, QFN-52
文件頁(yè)數(shù)： 5/26頁(yè)
文件大小： 414K
代理商： LTC3609IWKG#PBF
LTC3609
3609fb
applicaTions inForMaTion
MinimumOff-timeandDropoutOperation
The minimum off-time, tOFF(MIN), is the smallest amount
of time that the LTC3609 is capable of turning on the bot-
tom MOSFET, tripping the current comparator and turning
the MOSFET back off. This time is generally about 250ns.
The minimum off-time limit imposes a maximum duty
cycle of tON/(tON + tOFF(MIN)). If the maximum duty cycle
is reached, due to a dropping input voltage for example,
then the output will drop out of regulation. The minimum
input voltage to avoid dropout is:
V
t
IN MIN
OUT
ON
OFF MIN
ON
(
)
(
)
=
+
A plot of maximum duty cycle vs frequency is shown in
Figure 3.
SettingtheOutputVoltage
The LTC3609 develops a 0.6V reference voltage between
the feedback pin, VFB, and the signal ground as shown in
Figure 6. The output voltage is set by a resistive divider
according to the following formula:
VOUT =0.6V 1+
R2
R1
Toimprovethefrequencyresponse,afeed-forwardcapaci-
tor, C1, may also be used. Great care should be taken to
route the VFB line away from noise sources, such as the
inductor or the SW line.
InductorSelection
Given the desired input and output voltages, the induc-
tor value and operating frequency determine the ripple
current:
Δ
IL =
VOUT
f L
1
VOUT
VIN
Lower ripple current reduces core losses in the inductor,
ESR losses in the output capacitors and output voltage
ripple. Highest efficiency operation is obtained at low
frequency with small ripple current. However, achieving
this requires a large inductor. There is a tradeoff between
component size, efficiency and operating frequency.
A reasonable starting point is to choose a ripple current
that is about 40% of IOUT(MAX). The largest ripple current
occurs at the highest VIN. To guarantee that ripple current
does not exceed a specified maximum, the inductance
should be chosen according to:
L =
VOUT
f ΔIL(MAX)
1
VOUT
VIN(MAX)
Figure3.MaximumSwitchingFrequencyvsDutyCycle
2.0
1.5
1.0
0.5
0
0.25
0.50
0.75
3609 F03
1.0
DROPOUT
REGION
DUTY CYCLE (VOUT/VIN)
SWITCHING
FREQUENCY
(MHz)
Figure2.CorrectingFrequencyShiftwithLoadCurrentChanges
CVON
0.01F
RVON2
100k
RVON1
30k
CC
VOUT
RC
(2a)
(2b)
VON
ITH
LTC3609
CVON
0.01F
RVON2
10k
Q1
2N5087
RVON1
3k
10k
CC
3609 F02
VOUT
INTVCC
RC
VON
ITH
LTC3609
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