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Automotive Single-Phase Core Regulator for

ISL78211

The ISL78211 is a single-phase buck regulator

implementing lntel™ IMVP-6™ protocol, with embedded

gate drivers. lntel™ Mobile Voltage Positioning (IMVP) is

a smart voltage regulation technology effectively

reducing power dissipation in lntel™ Pentium processors.

Technology™, Intersil’s Robust Ripple Regulator

modulator. Compared with the traditional multi-phase

variable switching frequency during a load transient.

The ISL78211 provides three operation modes: the

Continuous Conduction Mode (CCM), the Diode

Emulation Mode (DEM) and the Enhanced Diode

Emulation Mode (EDEM). To boost battery life, the

ISL78211 changes its operation mode based on CPU

mode signals DPRSLRVR and DPRSTP#, and the FDE pin

setting, to maximize the efficiency. In CPU active mode,

the ISL78211 commands the CCM operation. When the

CPU enters deeper sleep mode, the ISL78211 enables

the DEM to maximize the efficiency at light load.

Asserting the FDE pin of the ISL78211 in CPU deeper

sleep mode will enable the EDEM to further decrease the

switching frequency at light load and increase the

regulator efficiency.

A 7-bit Digital-to-Analog Converter (DAC) allows dynamic

adjustment of the core output voltage from 0.300V to

1.500V. The ISL78211 has 0.8% system voltage

accuracy over entire temperature.

A unity-gain differential amplifier provides remote

voltage sensing at the CPU die. This allows the voltage on

the CPU die to be accurately measured and regulated per

lntel™ IMVP-6 specification. Current sensing can be

implemented through either lossless inductor DCR

sensing or precise resistor sensing. If DCR sensing is

used, an NTC thermistor network will thermally

compensates the gain and the time constant variations

caused by the inductor DCR change.

The ISL78211 provides the power monitor function

through the PMON pin. PMON output is a high-bandwidth

analog voltage signal representing the CPU

instantaneous power. The power monitor function can be

used by the system to optimize the overall power

consumption, extending battery run time.

The ISL78211 is fully TS16949 compliant and tested to

AEC-Q100 specifications.

Features

• Precision single-phase CORE voltage regulator

temperature range

- 0.8% system accuracy over entire temperature

range

- Enhanced load line accuracy

• Internal gate driver with 2A driving capability

• Microprocessor voltage identification input

- 7-Bit VID input

- 0.300V to 1.500V in 12.5mV steps

- Support VID change on-the-fly

• Multiple current sensing schemes supported

- Lossless inductor DCR current sensing

- Precision resistive current sensing

•Thermal monitor

• Power monitor indicating CPU instantaneous power

• User programmable switching frequency

• Differential remote voltage sensing at CPU die

• Overvoltage, undervoltage, and overcurrent

protection

• TS16949 Compliant

• AEC-Q100 tested

• Pb-free (RoHS compliant)

March 8, 2010

FN7578.0