MP2935 datasheet(8/42 Pages) MPS

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MP2935 — 4-PHASE PWM CONTROLLER FOR VR12.5 APPLICATIONS

MP2935 Rev. 1.02

www.MonolithicPower.com

8/25/2015

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

PIN DEFINITION

Pin #

Name

I/O

Description

OTPD

Factory OTP programming only. Connect to VCC for normal operation.

OTPG

Factory OTP programming only. Connect to GND for normal operation.

SDIO

I/O

Data Signal between CPU and Serial VID Controller.

ALERT#

Alert Signal from VID Controller to CPU.

SCLK

Source Synchronous Clock from CPU.

VRRDY

VR Ready Output. Open drain output signal.

VRHOT#

Voltage Regulator Thermal Throttling Logic Output. Actively pulls low if

temperature at the monitoring point connected to TEMP exceeds the

programmed VRHOT# temperature threshold.

ADDR

SVID Address setting pin. Refer to Table 6 for address assignment.

TEMP

I/O

Analog Temperature Signal Input.

IMON

Analog Total Load Current Signal. Sources a current proportional to the

sensed total load current. Connect a resistor from IMON to GND to

program the gain.

AAM

Advanced Asynchronous Mode (AAM) Timing Control Input. A resistor

between this pin to ground sets the AAM mode turn-on threshold voltage.

FSET

Multiphase Frequency-Setting Input. A resistor connected between FSET

and GND sets the oscillator frequency. The phase switching frequency will

be divided by number of the operating phase.

VBOOT

I/O

VBOOT Voltage Set. Refer to Table 3 for VBOOT voltage assignment.

FAULT#

VR Fault#. Asserts low to notify the platform of a VR fault condition.

PWM4

PWM3

PWM2

PWM1

Tri-State Logic-Level PWM Outputs. Connecting the PWM2 and/or PWM3

and/or PWM4 outputs to VCC turns off that phase, allowing MP2935 to

change the number of operating phases. The operating phase number is

decided when the part is enable. The number of operating phase cannot be

changed on-the-fly.

CCM

Forced CCM Operation Enable. CCM stays high in Power States 00 and

01. Actively pulls low when in Power States 02 and 03 to enable DCM

operation of the power stage. Connect it to the SYNC pin of Intelli-

Phases

TM.

TMAX

Max. Temp. Set. Connect a resistor from TMAX to GND to set the

maximum temperature.

CS4

CS3

CS2

CS1

Current Balance Inputs. Measures the current level in each phase. Float

CS pins of unused phases.

VCM

Buffered 2.5V reference.

ICCMAX

ICCMAX setting. Set the pin voltage to program the desired ICCMAX level.

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