March 2014 Altera Corporation

DS-1041

Datasheet

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Synchronous Buck Regulator

The Altera® Enpirion® ER3105DI is a 500mA Synchronous

buck regulator with an input range of 3V to 36V. It provides an

easy to use, high efficiency low BOM count solution for a

variety of applications.

The ER3105DI integrates both high-side and low-side NMOS

FET's and features a PFM mode for improved efficiency at

light loads. This feature can be disabled if forced PWM mode

is desired. The part switches at a default frequency of 500kHz

but may also be programmed using an external resistor from

300kHz to 2MHz. The ER3105DI has the ability to utilize

internal or external compensation. By integrating both NMOS

devices and providing internal configuration options, minimal

external components are required, reducing BOM count and

complexity of design.

an easy to implement design solution for a variety of

applications while giving superior performance. It provides a

very robust design for industrial, battery, and FPGA power

applications.

The part is available in a small Pb free 4mmx3mm DFN

plastic package with an operation temperature range of

-40°C to +125°C

Features

• Wide input voltage range 3V to 36V

• Synchronous Operation for high efficiency

• No compensation required

• Integrated High-side and Low-side NMOS devices

• Selectable PFM or forced PWM mode at light loads

• Internal fixed (500kHz) or adjustable Switching frequency

300kHz to 2MHz

• Continuous output current up to 500mA

• Internal or external Soft-start

• Minimal external components required

• Power-good and enable functions available.

Applications

• FPGA power

• Digital processor power

• Mixed-signal ASIC power

• Industrial control

• Medical devices

• Portable instrumentation

• Distributed Power supplies

• Cloud Infrastructure

FIGURE 1. TYPICAL APPLICATION

GND

CBOOT

100nF

CFB

R3

R2

SW

SS

SYNC

BOOT

PVIN

PGND

FSW

COMP

FB

AVINO

POK

EN

CAVINO

1µF

CVIN

10µF

L1

22µH

COUT

10µF

1

2

3

4

5

6

9

10

11

12

INTERNAL DEFAULT PARAMETER SELECTION

COUT

10µF

VOUT

50

55

60

65

70

75

80

85

90

95

100

0

0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50

OUTPUT LOAD (A)

09616

March 14, 2014

Rev A