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參數(shù)資料
| 型號： | SC1185A |
| 廠商： | Semtech Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 122K |
| 代理商： | SC1185A |
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
1999 SEMTECH CORP.
PRELIMINARY - January 6, 1999
652 MITCHELL ROAD NEWBURY PARK CA 91320
SC1185
SC1185A
8
LAYOUT GUIDELINES
Careful attention to layout requirements are necessary
for successful implementation of the SC1185 PWM
controller. High currents switching at 140kHz are pre-
sent in the application and their effect on ground plane
voltage differentials must be understood and mini-
mized.
1). The high power parts of the circuit should be laid out
first. A ground plane should be used, the number and
position of ground plane interruptions should be such
as to not unnecessarily compromise ground plane in-
tegrity. Isolated or semi-isolated areas of the ground
plane may be deliberately introduced to constrain
ground currents to particular areas, for example the in-
put capacitor and bottom FET ground.
2). The loop formed by the Input Capacitor(s) (Cin), the
Top FET (Q1) and the Bottom FET (Q2) must be kept
as small as possible. This loop contains all the high cur-
rent, fast transition switching. Connections should be as
wide and as short as possible to minimize loop induc-
tance. Minimizing this loop area will a) reduce EMI, b)
lower ground injection currents, resulting in electrically
“cleaner” grounds for the rest of the system and c) mini-
mize source ringing, resulting in more reliable gate
switching signals.
3). The connection between the junction of Q1, Q2 and
the output inductor should be a wide trace or copper
region. It should be as short as practical. Since this
connection has fast voltage transitions, keeping this
connection short will minimize EMI. The connection be-
tween the output inductor and the sense resistor should
be a wide trace or copper area, there are no fast volt-
age or current transitions in this connection and length
is not so important, however adding unnecessary
impedance will reduce efficiency.
Vout
12V IN
3.3V
Vo Lin1
Vo Lin2
5V
4uH
5mOhm
+
Cout
+
Cin
10
Q2
0.1uF
Q3
+
Cout Lin1
2.32k
Q4
+
Cout Lin2
1.00k
+
Cin Lin
SC1185
AGND
1
VCC
5
REF
6
PWRGOOD
7
CS-
8
CS+
9
PGNDH
10
DH
11
BSTH
15
EN
16
VOSENSE
17
VID4
18
VID3
19
VID2
20
VID1
21
VID0
22
DL
13
PGNDL
12
BSTL
14
GATE2
24
GATE1
2
LDVO
23
LDOS1
3
LDOS2
4
Q1
0.1uF
Heavy lines indicate
high current paths.
Layout diagram for the SC1185
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| SC1185ACSW | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| SC1185CSW | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| SC1185 | Programmable Synchronous DC/DC Converter, Dual LDO Controller(兼有可編程同步DC/DC控制器和雙固定(1.5V和2.5V)輸出低壓差穩(wěn)壓器) |
| SC1186CSW | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| SC1186 | Programmable Synchronous DC/DC Converter, Dual LDO Controller(兼有可編程同步DC/DC控制器(1.3-3.5V輸出)和雙固定(1.5V和2.5V)輸出低壓差穩(wěn)壓器) |
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|---|---|
| SC1185ACSW | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER, DUAL LOW DROPOUT REGULATOR CONTROLLER |
| SC1185ACSW.TR | 制造商:Semtech Corporation 功能描述:Voltage Mode PWM Controller 1.3V to 3.5V 15A 24-Pin SOIC T/R |
| SC1185ACSW.TRT | 制造商:Semtech Corporation 功能描述:Voltage Mode PWM Controller 1.3V to 3.5V 15A 24-Pin SOIC T/R |
| SC1185ACSWTRT | 制造商:Semtech Corporation 功能描述:Voltage Mode PWM Controller 1.3V to 3.5V 15A 24-Pin SOIC T/R |
| SC1185CSW | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER, DUAL LOW DROPOUT REGULATOR CONTROLLER |
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