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參數(shù)資料
| 型號： | LTC3776 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit Buffer/Driver With 3-State Outputs 48-TVSOP -40 to 85 |
| 中文描述： | 雙2相，無檢測電阻同步控制器用于DDR / QDR存儲器終端 |
| 文件頁數(shù)： | 1/28頁 |
| 文件大?。?/td> | 429K |
| 代理商： | LTC3776 |
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1
LTC3776
3776f
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode
is a registered trademark of Linear Technology Corporation.
No R
is a trademark of
Linear Technology Corporation.
All other trademarks are the property of their respective
owners. Protected by U.S. Patents including
5481178, 5929620, 6144194, 6580258,
6304066, 6611131, 6498466, patent pending on Spread Spectrum.
Dual 2-Phase, No R
SENSE
Synchronous Controller for
DDR/QDR Memory Termination
TM
,
High Efficiency, 2-Phase, DDR Memory (V
DDQ
and V
TT
) Supplies
■
No Current Sense Resistors Required
■
Out-of-Phase Controllers Reduce Required
Input Capacitance
■
V
OUT2
Tracks 1/2 V
REF
■
Symmetrical Source/Sink Output Current
Capability (V
OUT2
)
■
Spread Spectrum Operation (When Enabled)
■
Wide V
IN
Range: 2.75V to 9.8V
■
Constant Frequency Current Mode Operation
■
0.6V
±
1.5% Voltage Reference (V
OUT1
)
■
Low Dropout Operation: 100% Duty Cycle
■
True PLL for Frequency Locking or Adjustment
■
Internal Soft-Start Circuitry
■
Power Good Output Voltage Monitor
■
Output Overvoltage Protection
■
Micropower Shutdown: I
Q
= 9
μ
A
■
Tiny Low Profile (4mm
×
4mm) QFN and Narrow
SSOP Packages
APPLICATIU
The LTC
3776 is a 2-phase dual output synchronous step-
down switching regulator controller for DDR/QDR memory
termination applications. The second controller regulates
its output voltage to 1/2 V
REF
while providing symmetrical
source and sink output current capability.
The No R
SENSE
constant frequency current mode architec-
ture eliminates the need for sense resistors and improves
efficiency. Power loss and noise due to the ESR of the
input capacitance are minimized by operating the two
controllers out of phase.
The switching frequency can be programmed up to 750kHz,
allowing the use of small surface mount inductors and ca-
pacitors. For noise sensitive applications, the LTC3776
switching frequency can be externally synchronized from
250kHz to 850kHz, or can be enabled for spread spectrum
operation. Forced continuous operation reduces noise and
RF interference. Soft-start for V
OUT1
is provided internally
and can be extended using an external capacitor.
The LTC3776 is available in the tiny thermally enhanced
(4mm
×
4mm) QFN package or 24-lead SSOP narrow
package.
■
DDR, DDR II and QDR Memory
■
SSTL, HSTL Termination Supplies
■
Servers, RAID Systems
■
Distributed DC Power Systems
SENSE1
+
V
IN
LTC3776
SGND
SENSE2
+
TG1
TG2
SW1
SW2
BG1
BG2
PGND
PGND
V
REF
V
FB1
V
FB2
I
TH2
470pF
(V
DDQ
)V
OUT1
4A
V
(V
TT
)
1.25V
±
4A
47
μ
F
47
μ
F
15k
2200pF
6.2k
59k
187k
1.5
μ
H
1.5
μ
H
I
TH1
3776 TA01a
10
μ
F
×
2
V
3.3V
LOAD CURRENT (mA)
E
100
60
90
80
70
10
100
1000
10000
3776 TA01b
0
50
40
30
20
10
FIGURE 14 CIRCUIT
CHANNEL 2 (V
IN
= 3.3V)
CHANNEL 1 (V
IN
= 5V)
CHANNEL 1 (V
IN
= 3.3V)
CHANNEL 2 (V
IN
= 5V)
Efficiency vs Load Current
FEATURES
DESCRIPTIOU
TYPICAL APPLICATIO
U
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3776EUF | Dual 2-Phase, No RSENSE Synchronous Controller for DDR/QDR Memory Termination |
| LTC3776EGN | Dual 2-Phase, No RSENSE Synchronous Controller for DDR/QDR Memory Termination |
| LTC3780 | DIODE SCHOTTKY DUAL ISOLATED 25V 150mW 0.33V-vf 200mA-IFM 2mA-IF 0.5uA-IR SOT-563 3K/REEL |
| LTC3780IG | High Efficiency, Synchronous, 4-Switch Buck-Boost Controller |
| LTC3780IUH | High Efficiency, Synchronous, 4-Switch Buck-Boost Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3776EGN | 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 SSOP N |
| 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:- 標準包裝: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:- 標準包裝: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 |
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