ER2120QI Datasheet, PDF (1/24 Pages) Altera Corporation – 2A Synchronous Buck Regulator with Integrated MOSFETs

Enpirion^® Power Datasheet
ER2120QI 2A Synchronous Buck
Regulator with Integrated MOSFETs
DS-1042
Datasheet
The Altera® Enpirion® ER2120QI is a synchronous buck
controller with internal MOSFETs packaged in a small
4mmx4mm QFN package. The ER2120QI can support a
continuous load of 2A and has a very wide input voltage
range. With the switching MOSFETs integrated into the IC,
the complete regulator footprint can be very small and provide
a much more efficient solution than a linear regulator.
The ER2120QI is capable of stand-alone operation or it can be
used in a master slave combination for multiple outputs that
are derived from the same input rail. Multiple slave channels
(up to six) can be synchronized. This method minimizes the
EMI and beat frequencies effect with multi-channel operation.
The switching PWM controller drives two internal N-Channel
MOSFETs in a synchronous-rectified buck converter topology.
The synchronous buck converter uses voltage-mode control
with fast transient response. The switching regulator provides
a maximum static regulation tolerance of 1% over line, load,
and temperature ranges. The output is user-adjustable by
means of external resistors down to 0.6V.
The output is monitored for undervoltage events. The
switching regulator also has overcurrent protection. Thermal
shutdown is integrated. The ER2120QI features a bi-directional
Enable pin that allows the part to pull the enable pin low
during fault detection.
POK delay for ER2120QI is 1ms typical (at 500kHz switching
frequency).
POWER GOOD
ENABLE
POK
EN
PVIN
+
V_IN
5.5V TO 14V
SYNC
M/S
BOOT
AVIN
AVINO
SS
ER2120QI
SW
V_OUT
+
FSW
AGND
PGND
FB
COMP
Features
• Up to 2A Continuous Output Current
• Integrated MOSFETs for Small Regulator Footprint
• Adjustable Switching Frequency, 500kHz to 1.2MHz
• Tight Output Voltage Regulation, 1% Over-temperature
• Wide Input Voltage Range, 5V 10% or 5.5V to 14V
• Wide Output Voltage Range, from 0.6V
• Simple Single-Loop Voltage-Mode PWM Control Design
• Input Voltage Feed-Forward for Constant Modulator Gain
• Fast PWM Converter Transient Response
• Lossless R_DS(ON) High Side and Low Side Overcurrent
Protections
• Undervoltage Detection
• Integrated Thermal Shutdown Protection
• Power-Good Indication
• Adjustable Soft-Start
• Start-Up with Pre-Bias Output
• Pb-free (RoHS Compliant)
Applications
• _{FPGA power}
• _{Point of Load Applications}
• _{Graphics Cards}
• ASIC Power Supplies
• Embedded Processor and I/O Supplies
• DSP Supplies
POWER GOOD
ENABLE
POK
EN
AVINO
AVIN
SS
SYNC
M/S
FSW
AGND
PVIN
ER2120QI
BOOT
SW
PGND
FB
COMP
V_IN
4.5V TO 5.5V
+
V_OUT
+
FIGURE 1. STAND-ALONE REGULATOR: V_IN 5.5V TO 14V
FIGURE 2. STAND-ALONE REGULATOR: V_IN 4.5V TO 5.5V
101 Innovation Drive
San Jose, CA 95134
www.altera.com
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ISO
9001:2008
Registered
March 2014 Altera Corporation
09615
March 14, 2014
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