參數(shù)資料
型號: LTC3727IG-1
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 3 A SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDSO28
封裝: 5.30 MM, PLASTIC, SSOP-28
文件頁數(shù): 19/32頁
文件大?。?/td> 366K
代理商: LTC3727IG-1
26
LTC3727/LTC3727-1
3727fc
2. Are the signal and power grounds kept separate? The
combined LTC3727 signal ground pin and the ground
return of CINTVCC must return to the combined COUT (–)
terminals. The path formed by the top N-channel MOSFET,
Schottky diode and the CIN capacitor should have short
leads and PC trace lengths. The output capacitor (–)
terminals should be connected as close as possible to the
(–) terminals of the input capacitor by placing the capaci-
tors next to each other and away from the Schottky loop
described above.
3. Do the LTC3727 VOSENSE pins resistive dividers con-
nect to the (+) terminals of COUT? The resistive divider
must be connected between the (+) terminal of COUT and
signal ground. The R2 and R4 connections should not be
along the high current input feeds from the input
capacitor(s).
4. Are the SENSE and SENSE + leads routed together
with minimum PC trace spacing? The filter capacitor
between SENSE + and SENSE should be as close as
possible to the IC. Ensure accurate current sensing with
Kelvin connections at the SENSE resistor.
5. Is the INTVCC decoupling capacitor connected close to
the IC, between the INTVCC and the power ground pins?
This capacitor carries the MOSFET drivers current peaks.
An additional 1
μF ceramic capacitor placed immediately
next to the INTVCC and PGND pins can help improve noise
performance substantially.
APPLICATIO S I FOR ATIO
WU
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Figure 10. LTC3727 Recommended Printed Circuit Layout Diagram
CB2
CB1
RPU
PGOOD
VPULL-UP
(<7V)
CINTVCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
+
CIN
D1
M1
M2
M3
M4
D2
+
CVIN
VIN
RIN
INTVCC
3.3V
R4
R3
R2
R1
RUN/SS1
SENSE1+
SENSE1
VOSENSE1
PLLFLTR
PLLIN
FCB
ITH1
SGND
3.3VOUT
ITH2
VOSENSE2
SENSE2
SENSE2+
PGOOD
TG1
SW1
BOOST1
VIN
BG1
EXTVCC
INTVCC
PGND
BG2
BOOST2
SW2
TG2
RUN/SS2
LTC3727
L1
L2
COUT1
VOUT1
GND
VOUT2
3727 F10
+
COUT2
+
RSENSE
fIN
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相關代理商/技術參數(shù)
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LTC3727IG-1#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
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