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參數(shù)資料
| 型號(hào)： | LTC3388IDD-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.21 A SWITCHING REGULATOR, PDSO10 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大小： | 282K |
| 代理商： | LTC3388IDD-1#PBF |
LTC3388-1/LTC3388-3
15
338813f
If transient load currents above 50mA 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:
COUT = VOUT+ –VOUT–
(
)
ILOAD IBUCK
tLOAD
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 of at least
22μH. This value represents a suitable trade-off between
size and efficiency for typical applications. A larger induc-
tor will benefit high voltage applications by increasing the
on-time of the PMOS switch and improving efficiency by
reducing gate charge loss. Choose an inductor with a DC
APPLICATIONS INFORMATION
current rating greater than 200mA. The DCR of the induc-
tor can have an impact on efficiency as it is a source of
loss. Trade-offs between price, size, and DCR should be
evaluated. Table 2 lists several inductors that work well
with the LTC3388-1/LTC3388-3.
Table 2. Recommended Inductors for LTC3388-1/LTC3388-3
INDUCTOR TYPE
L
(μH)
MAX
IDC
(mA)
MAX
DCR
(Ω)
SIZE in mm
(L
× W × H)
MANU-
FACTURER
CDRH2D18/LDNP
22
300
0.320
3.2
× 3.2 × 2.0
Sumida
A997AS-220M
22
390
0.440
4.0
× 4.0 × 1.8
Toko
LPS5030-223MLC
22
700
0.190
4.9
× 4.9 × 3.0
Coilcraft
LPS4012-473MLC
47
350
1.400
4.0
× 4.0 × 1.2
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.
This circuit does not require the capacitors on VIN2 and
CAP, saving components and allowing a lower voltage
rating for the single VIN capacitor.
338813 F06
EN
STBY
VIN
VIN2
CAP
D1
D0
EN
STBY
PGOOD
SW
VOUT
PGOOD
LTC3388-1
GND
2.2μF
6V
2.7V TO 5.5V
10μF
6V
VOUT
1.2V
22μH
Figure 6. Smallest Solution Size 1.2V
Low Input Voltage Power Supply
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC3388IDD-3 | 制造商:Linear Technology 功能描述: |
| LTC3388IDD-3#PBF | 功能描述:IC REG BUCK SYNC 50MA 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 |
| LTC3388IDD-3#TRPBF | 功能描述:IC REG BUCK SYNC 50MA 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 |
| LTC3388IMSE-1#PBF | 功能描述:IC REG BUCK SYNC 50MA 10MSOP 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 |
| LTC3388IMSE-1#TRPBF | 功能描述:IC REG BUCK SYNC 50MA 10MSOP 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 |
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