ER3105DI Datasheet, PDF (1/25 Pages) Altera Corporation – 500mA Wide VIN Synchronous Buck Regulator

Enpirion^® Power Datasheet
ER3105DI 500mA Wide V_IN
Synchronous Buck Regulator
DS-1041
Datasheet
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.
With the wide V_IN range and reduced BOM the part provides
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
CBOOT
100nF
VOUT
COUT
10µF
L1
22µH
CVIN
10µF
1 SS
2
SYNC
3 _BOOT
4 _PVIN
5 _SW
6
PGND
GND
FSW ¹²
11
COMP
10
FB
9
AVINO
POK
EN
R2
R3
CAVINO
1µF
CFB
INTERNAL DEFAULT PARAMETER SELECTION
FIGURE 1. TYPICAL APPLICATION
100
95
V_IN = 15V
V_IN = 12V
V_IN = 5V
90
85
80
75
70
V_IN = 24V
65
V_IN = 33V
60
55
50
0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD, PFM, V_OUT = 3.3V
101 Innovation Drive
San Jose, CA 95134
www.altera.com
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ISO
9001:2008
Registered
March 2014 Altera Corporation
09616
March 14, 2014
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