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參數(shù)資料
| 型號： | LTC1628 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 射頻放大器 |
| 文件頁數(shù)： | 27/32頁 |
| 文件大?。?/td> | 366K |
| 代理商： | LTC1628 |
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LTC1628/LTC1628-PG
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1628. These items are also illustrated graphically in
the layout diagram of Figure 10. The Figure 11 illustrates
the current waveforms present in the various branches of
the 2-phase synchronous regulators operating in the
continuous mode. Check the following in your layout:
1. Are the top N-channel MOSFETs M1 and M3 located
within 1cm of each other with a common drain connection
at C
IN
Do not attempt to split the input decoupling for the
two channels as it can cause a large resonant loop.
2. Are the signal and power grounds kept separate The
combined LTC1628 signal ground pin and the ground
return of C
INTVCC
must return to the combined C
OUT
(–)
terminals. The path formed by the top N-channel MOSFET,
Schottky diode and the C
IN
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 LTC1628 V
OSENSE
pins resistive dividers con-
nect to the (+) terminals of C
OUT
The resistive divider
must be connected between the (+) terminal of C
OUT
and
Figure 10. LTC1628 Recommended Printed Circuit Layout Diagram
C
B2
C
B1
FLTCPL
R
PU
PGOOD
V
PULL-UP
(<7V)
C
INTVCC
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
+
C
IN
D1
M1
M2
M3
M4
D2
+
C
VIN
V
IN
R
IN
INTV
CC
3.3V
R4
R3
*PGOOD ON THE LTC1628-PG
R2
R1
RUN/SS1
SENSE1
+
SENSE1
–
V
OSENSE1
FREQSET
STBYMD
FCB
I
TH1
SGND
3.3V
OUT
I
TH2
V
OSENSE2
SENSE2
–
SENSE2
+
TG1
SW1
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
SW2
TG2
RUN/SS2
LTC1628
L1
L2
C
OUT1
V
OUT1
GND
V
OUT2
1628 F10
+
C
OUT2
+
R
SENSE
R
SENSE
FLTCPL
(PGOOD)*
APPLICATIOU
W
U
U
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| LTC1628CG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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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