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參數(shù)資料
| 型號： | LTC3588EDD-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO10 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 391K |
| 代理商： | LTC3588EDD-1#TRPBF |
LTC3588-1
13
35881fa
APPLICATIONS INFORMATION
This is true for output capacitors on the order of 100μF
or larger, but as the output capacitor decreases towards
10μF delays in the internal sleep comparator along with
the load current may result in the VOUT voltage slewing
past the ±12mV thresholds. This will lengthen the sleep
time and increase VOUT ripple. A capacitor less than 10μF
is not recommended as VOUT ripple could increase to an
undesirable level.
If transient load currents above 100mA are required then a
larger capacitor can be used at the output. This capacitor
will be continuously discharged during a load condition
and the capacitor can be sized for an acceptable drop in
VOUT:
C
OUT = VOUT+ VOUT–
()
I
LOAD IBUCK
t
LOAD
Here VOUT+ is the value of VOUT when PGOOD goes high
and VOUT– is the desired lower limit of VOUT. IBUCK is the
average current being delivered from the buck converter,
typically IPEAK/2.
A standard surface mount ceramic capacitor can be used
for COUT, though some applications may be better suited
to a low leakage aluminum electrolytic capacitor or a
supercapacitor. These capacitors can be obtained from
manufacturers such as Vishay, Illinois Capacitor, AVX,
or CAP-XX.
Inductor
The buck is optimized to work with an inductor in the range
of 10μH to 22μH, although inductor values outside this
range may yield benets in some applications. For typical
applications, a value of 10μH is recommended. A larger
inductor will benet high voltage applications by increasing
the on-time of the PMOS switch and improving efciency
by reducing gate charge loss. Choose an inductor with a
DC current rating greater than 350mA. The DCR of the
inductor can have an impact on efciency as it is a source
of loss. Tradeoffs between price, size, and DCR should be
evaluated. Table 3 lists several inductors that work well
with the LTC3588-1.
Table 3. Recommended Inductors for LTC3588-1
INDUCTOR
TYPE
L
(μH)
MAX
IDC
(mA)
MAX
DCR
(Ω)
SIZE in mm
(L
× W × H)
MANU-
FACTURER
CDRH2D18/LDNP
10
430
0.180
3
× 3 × 2
Sumida
107AS-100M
10
650
0.145
2.8
× 3 × 1.8
Toko
EPL3015-103ML
10
350
0.301
2.8
× 3 × 1.5
Coilcraft
MLP3225s100L
10
1000
0.130 3.2
× 2.5 × 1.0
TDK
XLP2010-163ML
10
490
0.611 2.0
× 1.9 × 1.0
Coilcraft
SLF7045T
100
500
0.250 7.0
× 7.0 × 4.5
TDK
VIN2 and CAP Capacitors
A 1μF capacitor should be connected between VIN and
CAP and a 4.7μF capacitor should be connected between
VIN2 and GND. These capacitors hold up the internal rails
during buck switching and compensate the internal rail
generation circuits. In applications where the input source
is limited to less than 6V, the CAP pin can be tied to GND
and the VIN2 pin can be tied to VIN as shown in Figure 6.
An optional 5.6V Zener diode can be connected to VIN to
clamp VIN in this scenario. The leakage of the Zener diode
below its Zener voltage should be considered as it may
be comparable to the quiescent current of the LTC3588-1.
This circuit does not require the capacitors on VIN2 and
CAP, saving components and allowing a lower voltage
rating for the single VIN capacitor.
Figure 6. Smallest Solution Size 1.8V Low Voltage Input
Piezoelectric Power Supply
35881 F06
PZ1
VIN
VIN2
CAP
D1
D0
PZ2
PGOOD
SW
VOUT
LTC3588-1
GND
10μF
6V
10μH
VOUT
1.8V
PGOOD
6V
5.6V
(OPTIONAL)
MIDE V21BL
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