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参数资料
| 型号： | LTC3634IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/28页 |
| 文件大小： | 0K |
| 描述： | IC CONV DDR DDR2 DDR3 28TSSOP |
| 标准包装： | 2,500 |
| 应用： | 转换器，DDR，DDR2，DDR3 |
| 输入电压： | 1.4 V ~ 15 V |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 3 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3634
PIN FUNCTIONS
(QFN/TSSOP)
VTTR (Pin 18/Pin 21): Reference Output. This output is
used to supply the V REF voltage for DDR memory. An on-
chip buffer amplifier outputs a low noise reference voltage
equal to VDDQIN/2. This output is capable of supplying
10mA. The buffer output can drive capacitive loads up to
0.01μF. The error amplifier for channel 2 uses this voltage
as its reference voltage.
INTV CC (Pin 19/Pin 22): Internal 3.3V Regulator Output.
The internal gate drivers and control circuits are powered
from this voltage. Decouple this pin to power ground with
a minimum of 1μF low ESR ceramic capacitor. The internal
regulator is disabled when both Channel 1 and Channel 2
are disabled with the RUN1/RUN2 inputs.
BOOST1 (Pin 20/Pin 23): Boosted Floating Driver Supply
for Channel 1. The (+) terminal of the bootstrap capacitor
connects to this pin while the (–) terminal connects to
the SW pin. The normal operation voltage swing of this
pin ranges from a diode voltage drop below INTV CC up
to V IN1 + INTV CC .
V IN1 (Pins 21, 22/Pins 24, 25): Power Supply Input for
Channel 1. Input voltage to the on-chip power MOSFETs
on channel 1. The internal LDO for INTV CC is powered
from this pin.
SW1 (Pins 23, 24/Pins 26, 27): Channel 1 Switch Node
Connection to External Inductor. Voltage swing of SW is
from a diode voltage drop below ground to a diode volt-
age above V IN1 .
V ON1 (Pin 25/Pin 28): On-Time Voltage Input for Chan-
nel 1. This pin sets the voltage trip point for the on-time
comparator. Tying this pin to the regulated output voltage
makes the on-time proportional to V OUT1 when V OUT1 < 3V.
When V OUT1 > 3V, switching frequency may become higher
than the set frequency (see the Applications Information
section). The pin impedance is nominally 150kΩ.
ITH1 (Pin 26/Pin 1): Channel 1 Error Amplifier Output
and Switching Regulator Compensation Pin. Connect this
pin to appropriate external components to compensate
the regulator loop frequency response. See the Applica-
tions Information section for guidelines on component
selection.
TRACKSS (Pin 27/Pin 2): Output Tracking and Soft-Start
Input Pin for Channel 1. Forcing a voltage below 0.6V on
this pin bypasses the internal reference input to the error
amplifier. The LTC3634 will servo the FB pin to the TRACK
voltage. Above 0.6V, the tracking function stops and the
internal reference resumes control of the error amplifier.
An internal 1.4μA pull-up current from INTV CC allows a
soft-start function to be implemented by connecting a
capacitor between this pin and SGND.
V FB1 (Pin 28/Pin 3): Channel 1 Output Feedback Voltage
Pin. Input to the error amplifier that compares the feedback
voltage to the internal 0.6V reference voltage. Connect this
pin to a resistor divider network to program the desired
output voltage. Connecting this pin to INTV CC configures
the LTC3634 for 2-phase, single output operation; see the
Applications Information section for full discussion.
PGND (Exposed Pad Pin 29/Exposed Pad Pin 29): Power
Ground Pin. The (–) terminal of the input bypass capacitor,
C IN , and the (–) terminal of the output capacitor, C OUT ,
should be tied to this pin with a low impedance connec-
tion. This pin must be soldered to the PCB to provide a
low impedance electrical contact to power ground and
good thermal contact to the PCB.
3634fb
For more information www.linear.com/LTC3634
9
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相关代理商/技术参数 |
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| LTC3634IUFD#PBF | 功能描述:IC CONV DDR DDR2 DDR3 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3634IUFD#TRPBF | 功能描述:IC CONV DDR DDR2 DDR3 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3634MPFE#PBF | 制造商:Linear Technology 功能描述:IC CONV DDR DDR2 DDR3 28TSSOP 制造商:Linear Technology 功能描述:BUCK 15V 3A 500KHZ-4MHZ TS 制造商:Linear Technology 功能描述:BUCK, 15V, 3A, 500KHZ-4MHZ, TSSOP-28 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, 15V Dual 3A Monolithic Step Down Regulator for DDR Power |
| LTC3634MPFE#TRPBF | 制造商:Linear Technology 功能描述:IC REG 15V 3A STEP DOWN 28-TSSOP 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, TSSOP-28, Primary Input Voltage:15V, No. of Outputs:2, Output Current:3A, No. of Pins:28, Operating Temperature Min:-55C, Operating Temperature Max:150C, MSL:-, Package / Case:28-TSSOP , RoHS Compliant: Yes |
| LTC3634MPUFD#PBF | 制造商:Linear Technology 功能描述:IC CONV DDR DDR2 DDR3 28-QFN 制造商:Linear Technology 功能描述:BUCK 15V 3A 500KHZ-4MHZ QF |
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