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LTC3738CUHF Datasheet

  • LTC3738CUHF

  • 3-Phase Buck Controller for Intel VRM9/VRM10 with Active Vol...

  • 32頁

  • LINER

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FEATURES
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LTC3738
3-Phase Buck Controller
for Intel VRM9/VRM10 with
Active Voltage Positioning
DESCRIPTIO
The LTC
廬
3738 is a 3-phase synchronous step-down switch-
ing regulator controller that drives all N-channel external
power MOSFET stages in a phase-lockable, fixed fre-
quency architecture. The 3-phase technique effectively
triples the fundamental frequency, improving transient
response while operating each controller at an optimal
frequency for efficiency and ease of thermal design. Light
load efficiency is optimized by using a choice of output
Stage Shedding or Pulse Skip mode technology.
The LTC3738 also allows users to program load slope via
a resistor for AVP control. Both external and internal
thermal sensing are available from the on-chip thermal
detector and comparator.
A differential amplifier provides sensing of both the high
and low sides of the output voltage.
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 a 1碌s timeout.
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP is a registered trademark of Linear Technology Corporation.
Stage Shedding is a trademark of Linear Technology Corporation.
3-Phase Controller with Onboard MOSFET Drivers
Programmable Active Voltage Positioning (AVP)
with True Current Sensing
Programmable External Thermal Detection or
Internal Thermal Sensing
Precise Output Current Matching Optimizes
Thermal Performance and Solution Size
Supports Starting into Precharged V
OUTS
Differential Amplifier Accurately Senses V
OUT
PWM, Pulse Skip and Stage Shedding
TM
Operation
Synchronizable
210kHz to 530kHz Per Phase, Fixed Frequency
Output Power Good Indicator with Adaptive Blanking
Adjustable Soft-Start Current Ramping
Short-Circuit Shutdown Timer with Defeat Option
OPTI-LOOP
廬
Compensation Minimizes C
OUT
38-Lead (5mm
脳
7mm) QFN Package
APPLICATIO S
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High Performance Notebook Computers
Servers, Desktop Computers and Workstations
U.S. Patent Numbers: 5481178, 5994885, 5929620, 6177787, 6144194, 6580258, 6462525,
6593724, 6674274, 6100678 pending on AVP technique.
TYPICAL APPLICATIO
5V
VRM10 Step-Down Controller
V
CC
10碌F
LTC3738
BOOST1
BOOST2
BOOST3
0.1碌F
SW3 SW2 SW1
POWER GOOD INDICATOR
MODE SELECTION/SYNC IN
PGOOD
FCB/SYNC
PLLFLTR
THERMAL INPUT
VR HOT INDICATOR
ON/OFF
680pF
I
TH
5k
0.1碌F
SS
SGND
EAIN
AVP
IN
+
IN
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TSNS
VR_HOTB
OUTEN
TG1
SW1
BG1
SENSE1
+
SENSE1
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TG2
SW2
BG2
PGND
SENSE2
+
SENSE2
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TG3
SW3
BG3
SENSE3
+
SENSE3
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VID0-VID5
6 VID BITS
V
IN
0.8碌H
0.002鈩?/div>
V
IN
0.8碌H
0.002鈩?/div>
V
OUT
0.8375V TO 1.6000V
0.8碌H
0.002鈩?/div>
100pF
U
+
U
U
+
V
IN
5V TO 28V
22碌F
脳2
470碌F
脳4
3738 TA01
3738f
1

LTC3738CUHF 產品屬性

  • LTC3738

  • 52

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 控制器，Intel VRM9、VRM10

  • 3.8 V ~ 36 V

  • 1

  • 0.84 V ~ 1.6 V

  • 0°C ~ 85°C

  • 表面貼裝

  • 38-WFQFN 裸露焊盤

  • 38-QFN（5x7）

  • 管件

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