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参数资料
| 型号： | LTC3632IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 20MA 8DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 50 V |
| 输入电压： | 4.5 V ~ 50 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 20mA |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LTC3632
APPLICATIONS INFORMATION
The undervoltage lockout requirement on V IN can be
satisfied with a resistive divider from V IN to the RUN and
HYST pins. Choose R1 = 2M and calculate R2 and R3 as
follows:
3. Keep the switching node, SW, away from all sensi-
tive small-signal nodes. The rapid transitions on the
switching node can couple to high impedance nodes,
in particular V FB , and create increased output ripple.
1.21V
V IN(RISING) – 1.21V ? ?
1.1V
V IN(FALLING) – 1.1V ? ?
?
R2 = ??
?
?
R3 = ??
?
?
? ? R1 = 224k
?
? ? R1 – R2 = 90.8k
4. Flood all unused area on all layers with copper. Flooding
with copper will reduce the temperature rise of power
components. You can connect the copper areas to any
DC net (V IN , V OUT , GND or any other DC rail in your
system).
Choose standard values for R2 = 226k and R3 = 91k.
The I SET pin should be left open in this example to select
maximum peak current (50mA). Figure 9 shows a complete
schematic for this design example.
V IN
C IN
2
5
7
4
V IN SW
LTC3632
HYST
SS I SET
RUN V FB
1
6
3
L1
R1
R2
V OUT
C OUT
V IN
24V
1μF
2M
V IN SW
LTC3632
RUN I SET
220μH
V OUT
3.3V
20mA
10μF
C SS
GND
8, 9
R SET
3632 F10a
226k
SS
750k
L1
91k
HYST
GND
V FB
240k
3632 F09
V IN
C IN
C OUT
V OUT
Figure 9. 24V to 3.3V, 20mA Regulator at 250kHz
PC Board Layout Checklist
R1
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3632. Check the following in your layout:
R SET
C SS
GND
R2
1. Large switched currents flow in the power switches
and input capacitor. The loop formed by these compo-
nents should be as small as possible. A ground plane
is recommended to minimize ground impedance.
2. Connect the (+) terminal of the input capacitor, C IN , as
close as possible to the V IN pin. This capacitor provides
the AC current into the internal power MOSFETs.
VIAS TO GROUND PLANE
VIAS TO INPUT SUPPLY (V IN )
OUTLINE OF LOCAL GROUND PLANE
Figure 10. Layout Example
3632 F10b
3632fc
16
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| LTC3632IMS8E#PBF | 功能描述:IC REG BUCK SYNC ADJ 20MA 8MSOP 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 |
| LTC3632IMS8E#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 20MA 8MSOP 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 |
| LTC3633AEFE#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 20V 28-Pin TSSOP EP 制造商:Linear Technology 功能描述:IC REG BUCK ADJ 3A DL 28TSSOP 制造商:Linear Technology 功能描述:BUCK DUAL 3.6-20V 4MHZ 3A 28TSSOP 制造商:Linear Technology 功能描述:BUCK, DUAL, 3.6-20V, 4MHZ, 3A, 28TSSOP 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Dual 3A, 20Vin, 4MHz, Monolithic Synchronous Step-Down Regu 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 4MHZ, TSSOP-28, Primary Input Voltage:15V, No. of Outputs:2, Output Current:3A, No. of Pins:28, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited, Package / Case:28-TSSOP , RoHS Compliant: Yes |
| LTC3633AEFE#TRPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 20V 28-Pin TSSOP EP T/R 制造商:Linear Technology 功能描述:IC REG BUCK ADJ 3A DL 28TSSOP |
| LTC3633AEFE-1#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 20V 28-Pin TSSOP EP 制造商:Linear Technology 功能描述:IC REG BUCK ADJ 3A DL 28TSSOP 制造商:Linear Technology 功能描述:BUCK DUAL 3.6-20V 4MHZ 3A 28TSSOP 制造商:Linear Technology 功能描述:BUCK, DUAL, 3.6-20V, 4MHZ, 3A, 28TSSOP 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Dual 3A, 20Vin, 4MHz, Monolithic Synchronous Step-Down Regu 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 4MHZ, TSSOP-28, Primary Input Voltage:15V, No. of Outputs:2, Output Current:3A, No. of Pins:28, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited, Package / Case:28-TSSOP , RoHS Compliant: Yes |
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