参数资料
| 型号： | SC419ULTRT |
| 厂商： | Semtech |
| 文件页数： | 21/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 20-MLPQ |
| 标准包装： | 1 |
| 系列： | EcoSpeed®, SmartDrive™ |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 3 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-MLPQ |
| 包装： | 标准包装 |
| 其它名称： | SC419ULTRTDKR |
SC419
Applications Information (continued)
Connect the V OUT sense trace directly to
?
?
?
?
the output capacitor or a ceramic bypass
capacitor.
? Route this trace over to the VOUT pin,
carefully avoiding all switching nets and
power components.
? Route this trace in a quiet layer if possible.
? Route this trace away from the switch-
ing traces and components, even if the
trace is longer. Avoid shorter trace routing
through the power switching area.
? If a bypass capacitor is used at the IC side
of the trace, it should be placed near the
FB resistor divider.
All components connected to the FB pin must
be located near the pin. The FB traces should be
kept small and not routed near any noisy switch-
ing connections or power components.
Place the R ILIM resistor near the IC. For an accu-
rate I LIM current sense connection, route the R ILIM
trace directly to the drain of the low-side MOSFET
(LX). Use an inner routing layer if needed.
Place the R TON resistor near the TON pin. Route
this to the TON trace using a short trace and
avoid all switching signals.
Bypass Capacitors
The device requires bypass capacitors for the following
pins.
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?
?
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VDDA pin with respect to AGND. This 100nF
minimum capacitor must be placed and routed
close to the IC pins, on the same layer as the IC.
VDDP with respect to PGND. This 1μF minimum
capacitor must be placed and routed close to
the IC pins and on the same layer as the IC.
BST pin with respect to LX. This 100nF minimum
capacitor must be placed near the IC, on either
side of the PCB. Use short traces for the routing
between the capacitor and the IC.
VIN pin with respect to AGND. This 100nF
minimum capacitor must be placed and routed
close to the IC pins. This capacitor provides
noise filtering for the input to the internal on-
time circuit.
21
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