Linear Design Features: LTC3816 - Jian Li's Journal (LTJournal-V21N3-04-df-LTC3816)
Summary
This application design article from Linear Technology's LT Journal of Analog Innovation (October 2011) presents the LTC3816 single-phase synchronous step-down DC/DC switching regulator controller designed for Intel IMVP-6, IMVP-6+, and IMVP-6.5 mobile CPU voltage positioning specifications. The article includes a complete reference design schematic using temperature-compensated inductor DCR current sensing, with component selections including Sanyo OS-CON capacitors, IHLP-5050CE-01 inductor, an
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High Efficiency Power Supply for Intel IMVP-6/IMVP-6+/IMVP-6.5 CPUs Jian Li and Gina Le
The LTC3816 is a single-phase synchronous step-down DC/DC switching regulator controller that complies with Intel Mobile Voltage Positioning (IMVP)-6/6+/6.5 specifications. It uses a constant-frequency voltage mode architecture with a leading edge modulation topology, allowing extremely low output voltages and very fast load transient response. The LTC3816 satisfies all of the IMVP-6, IMVP-6+ and IMVP-6.5 requirements, including 7-bit VID code, start-up to a preset boot voltage, differential remote output voltage sensing with programmable active voltage positioning (AVP), IMON output current reporting, power optimization during sleep state and fast or slow slew rate sleep state exit. It is suitable for a wide range of input voltages from 4.5V to 36V and output voltages up to 1.5V. The LTC3816 is available in 38-pin thermally enhanced e TSSOP and 5mm × 7mm QFN packages.
Figure 1. An IMVP-6.5 converter using temperature-compensated inductor DCR sensing
ISENN
ITCFB IMAX
ITC ISENP
15n F 21k PREIMON LFF
VRTT# 56Ω
IMON IMON VRTT# 1.1V
LTC3816 1.9k
CLKEN#
RPTC CLKEN# 3.3V VIN
1000p F 1.9k 4.5V TO 24V
VRONVRON PWRGD
PWRGD
VSS(SEN)
SW 100ΩCVIN
VCC(SEN)
TG QT 100Ω
SERVO
BOOST
12k 10p F VIN DB VCC(CORE)
QB CCER
COMP CBULK
ILOAD(MAX) = 27A
EXTVCC 5V
INTVCC
22p F470p F DPRSLPVR
BSOURCE
CBULK: 3 × SANYO 2TPF330M6 (330µF)
CSLEW MODE/SYNC
CCER: 20 × 10µF + 2 × 1µF
VID0 RFREQ CIN: 2 × SANYO OS-CON 35SVPD47M + 2 × 10µF
DB: CMDSH-4E
VID1 VID6
L: IHLP-5050CE-01 (0.33µH, DCR = 1.3mΩ)
VID2 VID5 NTC: MURATA NCP18XH103
VID0 VID4 PTC: MURATA PRF18BC471QB1RB
VID1 GND
QB: 2 × RENESAS RJK0330DPB
VID2 QT: RENESAS RJK0305DPB VID3 VID4 VID5 VID6
20 | October 2011 : LT Journal of Analog Innovation
Page Summary Contents For Linear Design Features: LTC3816 - Jian Li's Journal (LTJournal-V21N3-04-df-LTC3816)
Manual Details
| Brand | Linear |
|---|---|
| Pages | 4 |
| File Size | 2.53 MB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What standards do the LTC3816 support?
It complies with Intel Mobile Voltage Positioning (IMVP)-6, IMVP-6+, and IMVP-6.5 specifications.
How does the LTC3816 handle voltage changes during operation?
Its leading edge modulation topology allows for ultrafast transient response and supports programmable active voltage positioning (AVP) with a -3mV/A slope over temperature.
Can the device manage variable input voltages?
Yes, it is suitable for a wide range of input voltages from 4.5V to 36V.
What specialized features protect the circuit?
It includes an onboard current limit circuit, input undervoltage lockout, and output overvoltage protection.