参数资料
型号: LTC3719EG#TRPBF
厂商: Linear Technology
文件页数: 1/32页
文件大小: 0K
描述: IC SW REG SYNC STEP-DOWN 36-SSOP
标准包装: 2,000
应用: 控制器,AMD Opteron?
输入电压: 4 V ~ 36 V
输出数: 1
输出电压: 0.8 V ~ 1.55 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
供应商设备封装: 36-SSOP
包装: 带卷 (TR)
LTC3719
2-Phase, High Efficiency,
Step-Down Controller for
AMD Opteron? CPUs
FEATURES
DESCRIPTIO
s
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Output Stages Operate Antiphase Reducing Input
and Output Capacitance Requirements and Power
Supply Induced Noise
Dual Input Supply Capability for Load Sharing
5-Bit AMD CPU VID Code:
V OUT = 0.8V to 1.55V
± 1% Output Voltage Accuracy
True Remote Sensing Differential Amplifier
Power Good Output Voltage Monitor
Supports Active Voltage Positioning
Current Mode Control Ensures Current Sharing
OPTI-LOOP ? Compensation Minimizes C OUT
Three Operational Modes: PWM, Burst and Cycle Skip
Programmable Fixed Frequency: 150kHz to 300kHz
Wide V IN Range: 4V to 36V Operation
Adjustable Soft-Start Current Ramping
Internal Current Foldback and Short-Circuit Shutdown
Overvoltage Soft Latch Eliminates Nuisance Trips
Available in 36-Lead Narrow (0.209) SSOP Package
The LTC ? 3719 is a 2-phase, VID programmable, synchro-
nous step-down switching regulator controller that drives
two N-channel external power MOSFET stages in a fixed fre-
quency architecture. The 2-phase controller drives its two
output stages out of phase at frequencies up to 300kHz to
minimize the RMS ripple currents in both input and output
capacitors. The 2-phase technique effectively multiplies the
fundamental frequency by two, improving transient re-
sponse while operating each channel at an optimum fre-
quency for efficiency. Thermal design is also simplified.
An operating mode select pin (FCB) can be used to select
among three modes including Burst Mode ? operation for
highest efficiency. An internal differential amplifier provides
true remote sensing of the regulated supply’s positive and
negative output terminals as required in high current ap-
plications.
The RUN/SS pin provides soft-start and optional timed,
short-circuit shutdown. Current foldback limits MOSFET
APPLICATIO S
dissipation during short-circuit conditions when the
overcurrent latchoff is disabled. OPTI-LOOP compensation
s
Servers and Workstations
, LTC and LT are registered trademarks of Linear Technology Corporation.
allows the transient response to be optimized for a wide
range of output capacitors and ESR values.
OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology Corporation.
AMD Opteron is a trademark of Advanced Micro Devices, Inc.
TYPICAL APPLICATIO
V IN
10 μ F
5V TO 28V
220pF
0.1 μ F
3.3k
FCB V IN TG1
RUN/SS BOOST1
LTC3719
SW1
I TH BG1
S
S
0.47 μ F
35V
× 6
1 μ H
D1
0.002 ?
SGND
PGOOD
PGND
SENSE1 +
5 VID BITS
VID0–VID4
EAIN
ATTENOUT
ATTENIN
SENSE1 –
TG2
BOOST2
SW2
BG2
0.47 μ F
D2
1 μ H
0.002 ?
V DD _ CORE
0.8V TO 1.55V
45A
V DIFFOUT
V OS –
V OS +
INTV CC
SENSE2 +
SENSE2 –
10 μ F
+
C OUT
270 μ F
2V
×4
3716 F01
Figure 1. High Current Dual Phase Step-Down Converter
sn3719 3719fs
1
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