參數(shù)資料
型號(hào)： SC424MLTRT
廠商： Semtech
文件頁(yè)數(shù)： 14/29頁(yè)
文件大?。?/td> 496K
描述： IC REG DL BUCK/LINEAR 28MLPQ
標(biāo)準(zhǔn)包裝： 1
系列： SmartDrive™
拓?fù)洌?/td> 降壓（降壓）（1），線性（LDO）（1）
功能： 任何功能
輸出數(shù)： 2
頻率 - 開(kāi)關(guān)： 200kHz ~ 1MHz
電壓/電流 - 輸出 1： 可調(diào)至 0.75V，6A
電壓/電流 - 輸出 2： 5V，150mA
帶 LED 驅(qū)動(dòng)器： 無(wú)
帶監(jiān)控器： 無(wú)
帶序列發(fā)生器： 無(wú)
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： 28-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 28-MLPQ（4x4）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： SC424MLDKR
SC414/SC424
14
Synchronous Buck Converter
The SC414/SC424 is a step down synchronous DC-DC buck
converter with integrated power MOSFETs and a 5V LDO.
The device is capable of 6A operation at very high effi -
ciency. A space saving 4x4 (mm) 28-pin package is used.
The programmable operating frequency range of 200kHz
to 1MHz enables optimizing the configuration for PCB
area and effi ciency.
The buck controller uses a pseudo-fi xed frequency adap-
tive on-time control. This control method allows fast tran-
sient response which permits the use of smaller output
capacitors.
Input Voltage Requirements
The SC414/SC424 requires two input supplies for normal
operation: V
IN
 and V5V. V
IN
 operates over the wide range
from 3V to 28V. V5V requires a 3.3 or 5V supply input that
can be an external source or the internal LDO confi gured
to supply 5V. If the LDO is enabled, V5V voltage must be
> 5V.
Psuedo-fi xed Frequency Adaptive On-time Control
The PWM control method used by the SC414/SC424 is
pseudo-fi xed 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 confi guration, 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 amplifi er 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 amplifi er.
Reduced output capacitance due to fast tran-
sient response
One-Shot Timer and Operating Frequency
One-shot timer operation is shown in Figure 2. The FB
Comparator output goes high when V
FB
 is less than the
internal 750mV reference. This feeds into the gate drive
and turns on the high-side MOSFET, and starts the one-
shot timer. The one-shot timer uses an internal compara-
tor and a capacitor. One comparator input is connected to
V
OUT
, the other input is connected to the capacitor. When
the on-time begins, the internal capacitor charges from
zero volts through a current which is proportional to V
IN
.
When the capacitor voltage reaches V
OUT
, the on-time is
completed and the high-side MOSFET turns off .
Gate
Drives
FB Comparator
One-Shot
Timer
On-time = K x R
TON
 x (V
OUT
/V
IN
)
V
OUT
V
IN
FB
750mV
Q1
Q2
L
C
OUT
 
V
IN
ESR
+
V
OUT
V
LX
FB
DH
DL
R
TON
+
-
Figure 2  On-Time Generation
"
"
"
"
"
Applications Information
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