LINEAR TECHNOLOGY LTC3730 3-Phase, 5-Bit Intel Mobile VID, 600kHz, Synchronous Buck Controller User's Manual Data Sheet
Summary
This PolyPhase synchronous step-down 3-Phase Controller is engineered for powering high-performance devices such as notebooks and tablets requiring ultra-efficient DC/DC conversion. Featuring support for Intel Mobile VID control up to 600kHz, it delivers stable power management for demanding computing components. The accompanying manual provides detailed electrical characteristics, application guidelines, and architectural specifications needed by system designers to implement this advanced triple-phase solution accurately.
Page 1 Text Content
LTC3730
3-Phase, 5-Bit Intel Mobile VID, 600k Hz,
Synchronous Buck Controller FEATURES DESCRIPTIO 3-Phase Current Mode Controller with Onboard The LTC®3730 is a Poly Phase® synchronous step-down MOSFET Drivers switching regulator controller that drives all N-channel ±5% Output Current Match Optimizes Thermal external power MOSFET stages in a phase-lockable fixed
Performance and Size of Inductors and MOSFETs frequency architecture. The 3-phase controller drives its Operational Amplifier Accomodates Mode Switching output stages with 120° phase separation at frequencies of ±1% VREF Accuracy Over Temperature up to 600k Hz per phase to minimize the RMS losses in both Reduced Input and Output Capacitance the input and output filter capacitors. The 3-phase tech- Reduced Power Supply Induced Noise nique effectively triples the fundamental frequency, im- VOUT Programmable from 0.6V to 1.75V (IMVP III)
proving transient response while operating each controller
±10% Power Good Output Indicator
at an optimal frequency for efficiency and ease of thermal
250k Hz to 600k Hz Per Phase, PLL, Fixed Frequency
design. Light load efficiency is optimized by using a choice
PWM, Stage Shedding TM or Burst Mode® Operation
of output Stage Shedding or Burst Mode technology.
OPTI-LOOP® Compensation Minimizes COUT
An internal operational amplifier provides mode selectable
Adjustable Soft-Start Current Ramping
output voltage programming in conjunction with the inter-
4V, VIN, Undervoltage RUN/SS Reset/Reattempt Circuit
nal VID voltage control DAC.
Short-Circuit Shutdown Timer with Defeat Option Overvoltage Soft Latch Soft-start and a defeatable, timed short-circuit shutdown Small 36-Lead Narrow (0.209”) SSOP Package protect the MOSFETs and the load. Current foldback
provides protection for the external MOSFETs under APPLICATIO S short-circuit or overload conditions. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode, Tablet Computers OPTI-LOOP and Poly Phase are registered trademarks of Linear Technology Corporation. Stage Shedding is a trademark of Linear Technology Corporation. All other trademarks are
High Performance Notebook Computers the property of their respective owners. Protected by U.S. Patents including 5481178,
High Output Current DC/DC Power Supplies
TYPICAL APPLICATIO
VCC 5V TO 28V
TG1VCC
4.5V TO 7V 0.003Ω1µH
LTC3730 22µF
10µF SW1
BOOST1
BOOST2 BOOST3
0.1µF SENSE1+ SENSE1–
SW3 SW2 SW1 VIN
POWER GOOD INDICATOR PGOOD 0.003Ω1µH VOUT
OPTIONAL SYNC IN PLLIN SW2 1.2V
PLLFLTR BG2 PGND
5 VID BITS VID0-VID4
SENSE2+
680p F SENSE2–
ITH TG3
5k RUN/SS
SGND BG3 EAIN
AMPOUT SENSE3+
SENSE3–IN– COUT 470µF
Figure 1. High Current Triple Phase Step-Down Converter
3730fa
Page Summary Contents For LINEAR TECHNOLOGY LTC3730 3-Phase, 5-Bit Intel Mobile VID, 600kHz, Synchronous Buck Controller User's Manual Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 373.93 KB |
| Published | June 21, 2026 |
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Frequently Asked Questions
What is the maximum operating frequency per phase?
The controller supports operation up to 600kHz for each individual phase.
Does the LTC3730 provide protection against overcurrent or short circuits?
It includes a Short-Circuit Shutdown Timer and implements Current foldback to protect external MOSFETs under overload conditions.
What ambient temperature range is recommended for use?
The specified operating ambient temperature range is 0°C to 70°C.
How does the controller manage efficiency during light load conditions?
It uses Stage Shedding or Burst Mode technology along with OPTI-LOOP compensation to minimize power losses and optimize efficiency.
What is the programmable voltage control capability of the device?
The internal operational amplifier allows for Programmable VID (Voltage Identifier) from 0.6V to 1.75V using a DAC.