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參數(shù)資料
| 型號： | LTC3776EGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual 2-Phase, No RSENSE Synchronous Controller for DDR/QDR Memory Termination |
| 中文描述： | 1 A DUAL SWITCHING CONTROLLER, 825 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 11/28頁 |
| 文件大?。?/td> | 429K |
| 代理商： | LTC3776EGN |
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11
LTC3776
3776f
phase detector adjusts the voltage on the PLLLPF pin to
align the turn-on of controller 1’s external P-channel
MOSFET to the rising edge of the synchronizing signal.
Thus, the turn-on of controller 2’s external P-channel
MOSFET is 180 degrees out of phase with the rising edge
of the external clock source.
The typical capture range of the LTC3776’s phase-locked
loop is from approximately 200kHz to 1MHz, with a
guarantee over all process variations and temperature to
be between 250kHz and 850kHz. In other words, the
LTC3776’s PLL is guaranteed to lock to an external clock
source whose frequency is between 250kHz and 850kHz.
Alternatively, the SYNC/SSEN pin may be tied to V
IN
to
–10
R
BW
= 3kHz
OPERATIOU
(Refer to Functional Diagram)
enable spread spectrum operation (see Spread Spectrum
Operation section).
Spread Spectrum Operation
Switching regulators can be particularly troublesome in
applications where electromagnetic interference (EMI) is
a concern. Switching regulators operate on a cycle-by-
cycle basis to transfer power to an output. In most cases,
the frequency of operation is either fixed or is a constant
based on the output load. This method of conversion
creates large components of noise at the frequency of
operation (fundamental) and multiples of the operating
frequency (harmonics). Figures 1a and 1b depict the
Figure 1a. Output Noise Spectrum of Conventional Buck
Switching Converter (LTC3776 with Spread Spectrum
Disabled) Showing Fundamental and Harmonic Frequencies
Figure 1b. Zoom-In of Fundamental Frequency of Conventional
Buck Switching Converter
FREQUENCY (kHz)
–80
A
–20
–10
–90
–100
–30
–60
–40
–50
–70
37361 F01b
–110
R
BW
= 30Hz
410
450
490
530
570
610
FREQUENCY (MHz)
–80
A
–20
–90
–100
–30
–60
–40
–50
–70
0
6
12
18
24
30
37361 F01a
–110
Figure 1c. Output Noise Spectrum of the LTC3776 Spread
Spectrum Buck Switching Converter. Note the Reduction in
Fundamental and Harmonic Peak Spectral Amplitude
Compared to Figure 1a.
Figure 1d. Zoom-In of Fundamental Frequency of the
LTC3776 Spread Spectrum Switching Converter. Note the
>20dB Reduction in Peak Amplitude and Spreading of the
Frequency Spectrum (Between Approximately 450kHz and
580kHz) Compared to Figure 1b.
FREQUENCY (kHz)
–80
A
–20
–10
–90
–100
–30
–60
–40
–50
–70
37361 F01d
–110
R
BW
= 30Hz
410
450
490
530
570
610
FREQUENCY (MHz)
–80
A
–20
–10
–90
–100
–30
–60
–40
–50
–70
0
6
12
18
24
30
37361 F01c
–110
R
BW
= 1kHz
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| LTC3776EGN#PBF | 功能描述:IC CTLR SYNC DUAL 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數(shù):2 輸出電壓:最低可調(diào)至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:30-TSSOP 包裝:帶卷 (TR) |
| LTC3776EGN#TRPBF | 功能描述:IC CNTRLR SYNC DUAL 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3776EGNPBF | 制造商:Linear Technology 功能描述:DC-DC Controller Dual Step-Down SSOP24 |
| LTC3776EUF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Sync Step Down 2.75V to 9.8V Input 24-Pin QFN EP |
| LTC3776EUF#PBF | 功能描述:IC CNTRLR SYNC DUAL 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
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