- 您现在的位置：买卖IC网 > PDF目录30769 > LTC3388IDD-1#PBF (LINEAR TECHNOLOGY CORP) 0.21 A SWITCHING REGULATOR, PDSO10 PDF资料下载
参数资料
| 型号： | LTC3388IDD-1#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.21 A SWITCHING REGULATOR, PDSO10 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件页数： | 7/20页 |
| 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
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3388IMSE-1#PBF | 0.21 A SWITCHING REGULATOR, PDSO10 |
| LTC3388EDD-1#PBF | 0.21 A SWITCHING REGULATOR, PDSO10 |
| LTC3388IMSE-3#TRPBF | 0.21 A SWITCHING REGULATOR, PDSO10 |
| LTC3388EDD-1#TRPBF | 0.21 A SWITCHING REGULATOR, PDSO10 |
| LTC3388EMSE-1#TRPBF | 0.21 A SWITCHING REGULATOR, PDSO10 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3388IDD-3#TRPBF | 功能描述:IC REG BUCK SYNC 50MA 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3388IMSE-1#PBF | 功能描述:IC REG BUCK SYNC 50MA 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3388IMSE-1#TRPBF | 功能描述:IC REG BUCK SYNC 50MA 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
发布紧急采购，3分钟左右您将得到回复。