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参数资料
| 型号： | LTC3634IUFD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 5.5 A DUAL SWITCHING CONTROLLER, 4600 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封装： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件页数： | 27/28页 |
| 文件大小： | 359K |
| 代理商： | LTC3634IUFD#TRPBF |
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LTC3634
8
3634f
VTTR (Pin 18/Pin 21): Reference Output. This output is
used to supply the VREF 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
0.01F. The error amplifier for channel 2 uses this voltage
as its reference voltage.
INTVCC (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.
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 INTVCC up
to VIN1 + INTVCC.
VIN1 (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 INTVCC 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 VIN1.
VON1 (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 VOUT1whenVOUT1<3V.
WhenVOUT1>3V,switchingfrequencymaybecomehigher
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 INTVCC allows a
soft-start function to be implemented by connecting a
capacitor between this pin and SGND.
VFB1 (Pin 28/Pin 3): Channel 1 Output Feedback Voltage
Pin.Inputtotheerroramplifierthatcomparesthefeedback
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 INTVCC 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,
CIN, and the (–) terminal of the output capacitor, COUT,
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.
pin FuncTions (QFN/TSSOP)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LTC3637EDHC#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 1A 16DFN |
| LTC3637EMSE#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 1A 16MSOP |
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