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LTC3733CUHF-1 Datasheet

  • LTC3733CUHF-1

  • 3-Phase, Buck Controllers for AMD CPUs

  • 334.86KB

  • 32頁

  • LINER

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LTC3733/LTC3733-1
3-Phase, Buck
Controllers for AMD CPUs
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
s
3-Phase Controller with Onboard MOSFET Drivers
Current Mode Control Ensures Current Sharing
Differential Amplifier Accurately Senses V
OUT
鹵5%
Output Current Matching Optimizes Thermal
Performance and Size of Inductors and MOSFETs
Reduced Input and Output Capacitance
Supports Active Voltage Positioning
VID Programmable Output Voltage from 0.8V to 1.55V
(AMD Opteron
TM
CPU)
6-Phase, 90A to 120A Operation
Output Power Good Indicator with Adaptive Blanking
210kHz to 530kHz Per Phase, PLL, Fixed Frequency
Synchronizable (LTC3733-1)
PWM, Stage Shedding or Burst Mode
廬
Operation
OPTI-LOOP
廬
Compensation Minimizes C
OUT
Adjustable Soft-Start Current Ramping
Short-Circuit Shutdown Timer with Defeat Option
No_CPU Detection
36-Lead 0.209" SSOP and 38-Lead (5mm
脳
7mm) QFN
The LTC
廬
3733 family are PolyPhase
廬
synchronous step-
down switching regulator controllers that drive all
N-channel external power MOSFET stages in a phase-
lockable, fixed frequency architecture. The 3-phase con-
troller drives its output stages with 120擄 phase separation
at frequencies of up to 530kHz per phase to minimize the
RMS current dissipated by the ESR of both the input and
output filter capacitors. The 3-phase technique effectively
triples the fundamental frequency, improving transient
response while operating each phase at an optimal fre-
quency for efficiency and ease of thermal design. Light
load efficiency is optimized by using a choice of output
stage shedding or Burst Mode technology.
A differential amplifier provides true remote sensing of both
the high and low sides of the output voltage at load points.
Soft-start and a defeatable, timed short-circuit shutdown
protect the MOSFETs and the load. A foldback current
circuit also provides protection for the external MOSFETs
under short-circuit or overload conditions. An all-鈥?鈥?VID
detector turns off the regulator after 1碌s timeout.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode, OPTI-LOOP and PolyPhase are registered trademarks of Linear Technology
Corporation. AMD Opteron is a trademark of Advanced Micro Devices, Inc.
APPLICATIO S
s
s
High Performance Notebook Computers
Servers, Desktop Computers and Workstations
TYPICAL APPLICATIO
5V
V
CC
10碌F
LTC3733-1
BOOST1
BOOST2
BOOST3
0.1碌F
TG1
SW1
BG1
SENSE1
+
SENSE1
鈥?/div>
TG2
SW2
BG2
PGND
SENSE2
+
SENSE2
鈥?/div>
TG3
SW3
BG3
SENSE3
+
SENSE3
鈥?/div>
V
IN
V
IN
L1 0.8碌H
D1
0.002鈩?/div>
SW3 SW2 SW1
POWER GOOD INDICATOR
OPTIONAL SYN IN
PGOOD
PLLIN
PLLFLTR
L2 0.8碌H
D2
0.002鈩?/div>
5 VID BITS
ON/OFF
680pF
VID0-VID4
RUN
I
TH
L3 0.8碌H
D3
5k
0.1碌F
SS
SGND
EAIN
IN
鈥?/div>
IN
+
0.002鈩?/div>
100pF
Figure 1. High Current Triple Phase Step-Down Converter
3733f
U
+
22碌F
35V
脳2
V
IN
5V TO 28V
V
OUT
0.8V TO 1.55V
65A
U
U
+
C
OUT
470碌F
4V
脳4
3733 F01
1

LTC3733CUHF-1 產(chǎn)品屬性

  • LTC3733/-1

  • 52

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 控制器，AMD

  • 4 V ~ 36 V

  • 1

  • 0.8 V ~ 1.55 V

  • 0°C ~ 70°C

  • 表面貼裝

  • 38-WFQFN 裸露焊盤

  • 38-QFN（5x7）

  • 管件

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