參數(shù)資料
型號(hào)： SC402BMLTRT
廠商： Semtech
文件頁(yè)數(shù)： 16/32頁(yè)
文件大?。?/td> 1425K
描述： IC REG DL BCK/LINEAR SYNC 32MLPQ
標(biāo)準(zhǔn)包裝： 1
系列： EcoSpeed®, SmartDrive™
拓?fù)洌?/td> 降壓（降壓）同步（1），線性（LDO）（1）
功能： 任何功能
輸出數(shù)： 2
頻率 - 開(kāi)關(guān)： 1MHz
電壓/電流 - 輸出 1： 可調(diào)至 0.6V，10A
電壓/電流 - 輸出 2： 可調(diào)至 0.75V，200mA
帶 LED 驅(qū)動(dòng)器： 無(wú)
帶監(jiān)控器： 無(wú)
帶序列發(fā)生器： 是
電源電壓： 3 V ~ 28 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 32-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 32-MLPQ（5x5）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： SC402BMLDKR
SC402B
16
Synchronous Buck Converter
The SC402B is a step down synchronous DC-DC buck
converter with integrated power MOSFETs and a 200mA
capable programmable LDO. The device is capable of 10A
operation at very high efficiency. A space saving 5x5 (mm)
32-pin package is used. The programmable operating
frequency of up to 1MHz enables optimizing the configu-
ration for PCB area and efficiency.
The buck controller uses a pseudo-fixed frequency adap-
tive on-time control. This control method allows fast tran-
sient response which permits the use of smaller output
capacitors.
In addition to the following information, the user can
click on the applicable link to go to the SC402B online 
C-SIM design and simulation tool, which will lead the 
user through the design process.
Input Voltage Requirements
The SC402B requires two input supplies for normal opera-
tion: V
IN
 and VDD. V
IN
 operates over a wide range from 3V
to 28V. VDD requires a 3V to 5.5V supply input that can be
an external source or the internal LDO configured to
supply 3V to 5.5V from V
IN
.
Power Up Sequence
When the SC402B uses an external power source at the
VDD pin, the switching regulator initiates the start up
when V
IN
, VDD and EN/PSV are above their respective
thresholds. When EN/PSV is at a logic high, VDD needs to
be applied after V
IN
 rises. It is also recommended to use
a10& resistor between an external power source and the
VDD pin. To start up by using the EN/PSV pin when both
VDD and V
IN
 are above their respective thresholds, apply
EN/PSV to enable the start-up process. For SC402B in self-
biased mode, refer to the LDO section for a full
description.
Shutdown
The SC402B can be shutdown by pulling either VDD or
EN/PSV below its threshold. When using an external
power source, it is recommended that the VDD voltage
ramps down before the V
IN
 voltage. When VDD is active
and EN/PSV at low logic, the output voltage discharges
into the VOUT pin through an internal FET.
Psuedo-fixed Frequency Adaptive On-time Control
The PWM control method used by the SC402B is pseudo-
fxed 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.
Q1
Q2
L
C
OUT
 
ESR
+
C
IN
V
OUT
FB Threshold
V
FB
V
LX
V
LX
TON
FB
V
IN
Figure 1  PWM Control Method, V
OUT
 Ripple
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 antici-
pates the on-time needed to regulate V
OUT
 for the present
V
IN
 condition and at the selected frequency.
The advantages of adaptive on-time control are:
Predictable operating frequency compared to
other variable frequency methods
Reduced component count by eliminating the
error amplifier and compensation components
Reduced component count by removing the
need to sense and control inductor current
Fast transient response  the response time is
controlled by a fast comparator instead of a typi-
cally slow error amplifier.
Reduced output capacitance due to fast tran-
sient response
"
"
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Applications Information
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