March 2014 Altera Corporation

DS-1043

Datasheet

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EC7100VQI PWM DC/DC Controller with

VS Inputs for FPGA Power Regulator

The Altera® Enpirion® EC7100VQI is a Single-Phase

Synchronous-Buck PWM controller. The wide 3.3V to 25V input

voltage range is ideal for systems that run on battery or AC-

adapter power sources. The EC7100VQI is a low-cost solution for

applications requiring dynamically selected slew-rate controlled

output voltages. The soft-start and dynamic setpoint slew-rates are

capacitor programmed. Voltage identification logic-inputs select

four resistor-programmed setpoint reference voltages that directly

set the output voltage of the converter between 0.5V and 1.5V, and

up to 5V with a feedback voltage divider.

The EC7100VQI modulator has equivalent light-load efficiency,

faster transient performance, accurately regulated frequency

control and all internal compensation. These updates, together

with integrated MOSFET drivers and schottky bootstrap diode,

allow for a high-performance regulator that is highly compact and

needs few external components. The EC7100VQI has differential

remote sensing for output voltage and selectable switching

frequency. For maximum efficiency, the converter automatically

enters diode-emulation mode (DEM) during light-load conditions

such as system standby.

Features

• Input Voltage Range: 3.3V to 25V

• Output Voltage Range: 0.5V to 5V

• Precision Regulation

- Frequency Control Loop

- ±0.5% System Accuracy Over -10°C to +100°C

• Optimal Transient Response

• Output Remote Sense

• Extremely Flexible Output Voltage Programmability

- 2-Bit VS Selects Four Independent Setpoint Voltages

- Simple Resistor Programming of Setpoint Voltages

• Selectable 300kHz, 500kHz, 600kHz or 1MHz PWM Frequency in

Continuous Conduction

• Automatic Diode Emulation Mode for Highest Efficiency

• Power-OK Monitor for Soft-Start and Fault Detection

Applications

• FPGA power

• Digital processor power

• Mixed-signal ASIC power

FIGURE 1. EC7100VQI APPLICATION SCHEMATIC WITH FOUR OUTPUT VOLTAGE SETPOINTS AND DCR CURRENT SENSE

BOOT

UGATE

SW

EN

POK

FSW

NSNS

VS1

VS0

SREF

SET0

SET1

3.3V TO 25V

0.5V TO 5V

CO

CIN

+5V

GPIO

1

2

3

4

5

6

15

14

13

12

11

16

NSNS1

NSNS1

GND

0

09613

March 14, 2014

Rev A