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| 型号： | SIC424CD-T1-GE3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 44MLP-28 |
| 标准包装： | 1 |
| 系列： | microBUCK® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 5.5 V |
| 输入电压： | 3 V ~ 28 V |
| 频率 - 开关： | 200kHz ~ 1MHz |
| 电流 - 输出： | 6A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 28-MLPQ（4x4） |
| 其它名称： | SIC424CD-T1-GE3DKR |
SiC414, SiC424
Vishay Siliconix
ELECTRICAL CHARACTERISTICS
Start-up with V IN Ramping up
(V IN = 12 V, V OUT = 1 V, FSW = 500 kHz)
APPLICATIONS INFORMATION
Device Overview
Over-Current Protection
(V IN = 12 V, V OUT = 1 V, FSW = 500 kHz)
The SiC414 and SiC424 are a step down synchronous buck
DC/DC converter with integrated power FETs and
programmable LDO. The device is capable of 6 A operation
at very high efficiency in a tiny 4 mm x 4 mm - 28 pin
V I N
C I N
t O N
V LX
package. The programmable operating frequency range of
200 kHz to 1 MHz, enables the user to optimize the solution
for minimum board space and optimum efficiency.
The buck controller employs pseudo-fixed frequency
adaptive on-time control. This control scheme allows fast
transient response thereby lowering the size of the power
components used in the system.
The buck controller employs pseudo-fixed frequency
Q1
Q2
V LX
L
V FB
ESR
+
C OUT
FB threshold
V OUT
FB
adaptive on-time control. This control scheme allows fast
transient response thereby lowering the size of the power
components used in the system.
Figure 1 - PWM Control Method, V OUT Ripple
Input Voltage Range
The SiC414 and SiC424 requires two input supplies for
normal operation: V IN and V5V. V IN operates over the wide
range from 3 V to 28 V. V5V requires a 3.3 V or 5 V supply
input that can be an external source or the internal LDO
configured to supply 5 V.
Pseudo-Fixed Frequency Adaptive On-Time Control
The PWM control method used by the SiC414 and SiC424
is pseudo-fixed frequency, adaptive on-time, as shown in
figure 1. The ripple voltage generated at the output capacitor
ESR is used as a PWM ramp signal. This ripple is used to
trigger the on-time of the controller.
The adaptive on-time is determined by an internal one-shot
timer. When the one-shot is triggered by the output ripple, the
device sends a single on-time pulse to the high side
MOSFET. The pulse period is determined by V OUT and V IN ;
the period is proportional to output voltage and inversely
proportional to input voltage. With this adaptive on-time
arrangement, the device automatically anticipates the
on-time needed to regulate V OUT for the present V IN
condition and at the selected frequency.
The adaptive on-time control has significant advantages over
traditional control methods used in the controllers today.
? Reduced component count by eliminating DCR sense or
current sense resistor as no need of a sensing inductor
current.
? Reduced saves external components used for
compensation by eliminating the no error amplifier and
other components.
? Ultra fast transient response because of fast loop,
absence of error amplifier speeds up the transient
response.
? Predictable frequency spread because of constant on-time
architecture.
? Fast transient response enables operation with minimum
output capacitance Overall, superior performance
compared to fixed frequency architectures.
Overall, superior performance compared to fixed frequency
architectures.
Document Number: 63388
S13-0248-Rev. B, 04-Feb-13
For technical questions, contact: powerictechsupport@vishay.com
www.vishay.com
9
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
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