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LTC3719EG Datasheet

  • LTC3719EG

  • Analog IC

  • 329.73KB

  • 32頁

  • ETC

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Final Electrical Specifications
LTC3719
2-Phase, 5-Bit VID,
Current Mode, High Efficiency,
Synchronous Step-Down Switching Regulator
FEATURES
s
DESCRIPTIO
December 2001
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
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 (Hammer) CPU VID Code:
V
OUT
= 0.8V to 1.55V
鹵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
廬
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
廬
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 regu-
late a secondary winding or select among three modes
including Burst Mode
廬
operation for highest efficiency. An
internal differential amplifier provides true remote sensing
of the regulated supply鈥檚 positive and negative output ter-
minals as required in high current applications.
The RUN/SS pin provides soft-start and optional timed,
short-circuit shutdown. Current foldback limits MOSFET
dissipation during short-circuit conditions when the
overcurrent latchoff is disabled. OPTI-LOOP compensation
allows the transient response to be optimized for a wide
range of output capacitors and ESR values.
APPLICATIO S
s
AMD (Sledgehammer and Clawhammer) CPU Supply
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
0.1碌F
220pF
FCB
RUN/SS
3.3k
I
TH
SGND
PGOOD
5 VID BITS
V
IN
TG1
BOOST1
SW1
S
10碌F
35V
脳6
0.47碌F
1碌H
S
0.002鈩?/div>
LTC3719
BG1
PGND
D1
VID0鈥揤ID4
EAIN
ATTENOUT
ATTENIN
V
DIFFOUT
V
OS 鈥?/div>
V
OS
+
SENSE1
+
SENSE1
鈥?/div>
TG2
BOOST2
SW2
BG2
SENSE2
+
SENSE2
鈥?/div>
D2
0.47碌F
1碌H
0.002鈩?/div>
V
DD
_
CORE
0.8V TO 1.55V
45A
Figure 1. High Current Dual Phase Step-Down Converter
3719i
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
+
INTV
CC
10碌F
U
+
C
OUT
270碌F
2V
脳4
3716 F01
U
U
V
IN
5V TO 28V
1

LTC3719EG 產(chǎn)品屬性

  • LTC3719

  • 37

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 控制器，AMD Opteron?

  • 4 V ~ 36 V

  • 1

  • 0.8 V ~ 1.55 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 36-SSOP（0.209"，5.30mm 寬）

  • 36-SSOP

  • 管件

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