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參數(shù)資料
| 型號： | SC470 |
| 廠商： | Semtech Corporation |
| 英文描述： | Synchronous Buck Controller for Dynamic Load-Voltage Applications |
| 中文描述： | 同步降壓控制器的動態(tài)負載電壓應用 |
| 文件頁數(shù)： | 17/31頁 |
| 文件大?。?/td> | 574K |
| 代理商： | SC470 |
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17
2005 Semtech Corp.
www.semtech.com
SC470
POWER MANAGEMENT
Application Information (Cont.)
C10
1uF
0603
R3
20k0
0402
R7
20k0
0402
EN/PSV
1
TON
2
VOUT
3
VCCA
4
FB
5
PGD
6
VSSA
7
PGND
8
DL
9
VDDP
10
ILIM
11
LX
12
DH
13
BST
14
U1
SC470
VOUT
C8
1nF
0402
R1
1M
0402
5VSUS
VBAT
PGOOD
Q1
IRF7811AV
Q2
FDS6676S
C9
1uF
0603
R4
7k87
C1
0.1uF
D1
SOD323
C2
2n2/50V
0402
VBAT
5VSUS
L1
2u2
+
C7
220u/25m
7343
VOUT
R2
10R
0402
C5
0402
R5
49k9
0402
VOUT SWITCH (1)
R6
0R (2)
0402
+
C6
220u/25m
7343
C3
0u1/25V
0603
C4
10u/25V
1210
0402
0603
NOTES
(1) driv en by an open drain with no pullup. LOW = 1.2V out, FLOATING = 1V out.
(2) R6 is not required but aids keeping VSSA separate f rom PGND except where desired in lay out.
VBAT = 8V to 20V
VOUT = 1.2V or 1.0V @ 6A
Figure 8: Reference Design For Dynamic Output Switching
One (or more) ground planes is/are recommended to minimize the effect of switching noise and copper losses, and
maximize heat dissipation. The IC ground reference, VSSA, should be kept separate from power ground. All
components that are referenced to VSSA should connected to it locally at the chip. VSSA should connect to power
ground at the output capacitor(s) only.
The VOUT feedback trace must be kept far away from noise sources such as switching nodes, inductors and gate
drives. Route the feedback trace with VSSA as a differential pair from the output capacitor back to the chip. Run
them in a “quiet layer” if possible. VSSA may be separated from PGND using a zero Ohm resistor (that will be placed
at the bottom of the output capacitors) to aid in net separation.
Chip decoupling capacitors (VDDP, VCCA) should be located next to the pins (VDDP and PGND, VCCA and VSSA) and
connected directly to them on the same side.
Power sections should connect directly to the ground plane(s) using multiple vias as required for current handling
(including the chip power ground connections). Power components should be placed to minimize loops and reduce
losses. Make all the connections on one side of the PCB using wide copper filled areas if possible. Do not use
“minimum” land patterns for power components. Minimize trace lengths between the gate drivers and the gates of
the MOSFETs to reduce parasitic impedances (and MOSFET switching losses), the low-side MOSFET is most critical.
Maintain a length to width ratio of <20:1 for gate drive signals. Use multiple vias as required by current handling
requirement (and to reduce parasitics) if routed on more than one layer
Current sense connections must always be made using Kelvin connections to ensure an accurate signal, with the
current limit resistor located at the device.
We will examine the reference design used in the Design Procedure section while explaining the layout guidelines in
more detail.
Layout Guidelines - TSSOP-14 as an example:
相關PDF資料 |
PDF描述 |
|---|---|
| SC470EVB | Synchronous Buck Controller for Dynamic Load-Voltage Applications |
| SC470IMLTRT | Synchronous Buck Controller for Dynamic Load-Voltage Applications |
| SC470ITSTRT | Synchronous Buck Controller for Dynamic Load-Voltage Applications |
| SC471EVB | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471MLTRT | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SC470EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller for Dynamic Load-Voltage Applications |
| SC470IMLTRT | 功能描述:IC REG CTRLR BUCK PWM 16-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| SC470ITSTRT | 功能描述:IC REG CTRLR BUCK PWM 14-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| SC471 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471_08 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
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