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| 型号： | LTC3776EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR SYNC DUAL 24-QFN |
| 标准包装： | 91 |
| 应用： | 控制器，DDR，QDR |
| 输入电压： | 2.75 V ~ 9.8 V |
| 输出数： | 2 |
| 输出电压： | 0.3 V ~ 9.8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 管件 |
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LTC3776
Dual 2-Phase, No R SENSE TM ,
Synchronous Controller for
DDR/QDR Memory Termination
FEATURES
DESCRIPTIO
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■
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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
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.
APPLICATIO S
■ DDR, DDR II and QDR Memory
■ SSTL, HSTL Termination Supplies
■ Servers, RAID Systems
■ Distributed DC Power Systems
The LTC3776 is available in the tiny thermally enhanced
(4mm × 4mm) QFN package or 24-lead SSOP narrow
package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst
Mode is a registered trademark of Linear Technology Corporation. No R SENSE 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.
TYPICAL APPLICATIO
10 μ F
× 2
High Efficiency, 2-Phase, DDR Memory (V DDQ and V TT ) Supplies
V IN
3.3V
V IN
SENSE1 + SENSE2 +
100
90
80
Efficiency vs Load Current
1.5 μ H
TG1
SW1
BG1
LTC3776
TG2
SW2
BG2
1.5 μ H
70
60
50
PGND
PGND
40
(V DDQ )V OUT1
2.5V
4A
187k
47 μ F
470pF
V REF
V FB1
I TH1
SGND
V FB2
I TH2
2200pF
V OUT2 (V TT )
1.25V
± 4A
47 μ F
30
20
10
0
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)
100 1000 10000
59k
15k
6.2k
LOAD CURRENT (mA)
3776 TA01b
3776 TA01a
3776fa
1
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| LTC3778EF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3778EF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3778EF#TR | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3778EF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3780EG | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 24-Pin SSOP |
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