Enpirion® Power Datasheet
EN5312QI 1A PowerSoC
Synchronous Buck Regulator
With Integrated Inductor
Product Overview
Featuring Integrated Inductor Technology
VIN
The Ultra-Low-Profile EN5312QI is targeted to
applications where board area and profile are
critical. EN5312QI is a complete power
conversion solution requiring only two low cost
ceramic MLCC caps. Inductor, MOSFETS,
PWM, and compensation are integrated into a
tiny 5mm x 4mm x 1.1mm QFN package. The
EN5312QI is engineered to simplify design and
to minimize layout constraints.
4 MHz
switching frequency and internal type III
compensation provides superior transient
response.
With a 1.1 mm profile, the
EN5312QI is ideal for space and height
constrained applications.
UVLO
Thermal Limit
Current Limit
ENABLE
Soft Start
P-Drive
(-)
Logic
VOUT
PWM
Comp
(+)
N-Drive
GND
VSENSE
Sawtooth
Generator
Compensation
Network
(-)
Switch
Error
Amp
VFB
(+)
DAC
VREF
Voltage
Select
A 3-pin VID output voltage selector provides
seven pre-programmed output voltages along
with an option for external resistor divider.
Output voltage can be programmed on-the-fly
to provide fast, dynamic voltage scaling.
Package Boundry
VS0 VS1 VS2
Product Highlights
Typical Application Circuit
• Revolutionary Integrated Inductor
• 5mm x 4mm x1.1mm QFN package
• Very small total solution foot print*
• 4 MHz switching frequency
• Only two low cost MLCC caps required
• Designed for low noise/low EMI
• Very low ripple voltage; 5mVp-p Typical
• High efficiency, up to 95%
• Wide 2.4V to 6.6V input range
• 1000mA continuous output current
• Less than 1 µA standby current.
• Excellent transient performance
• 3 Pin VID Output Voltage select
• External divider: 0.6V to VIN-Vdropout
• 100% duty cycle capable
• Short circuit and over current protection
• UVLO and thermal protection
• RoHS compliant; MSL 3 260°C reflow
Voltage
Select
VS0
VS1
VS2
EN5312QI
Vin
4.7µF
VOUT
Vout
VFB
10µF
GND
Figure 1. Typical application circuit.
Applications
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1
04535
VSense
ENABLE
VIN
December 3, 2013
Area constrained applications
Noise Sensitive Applications such as A/V
and RF
LDO replacement for improved thermals
Lower Power FPGA and ASICs
Smart phones, PDAs
VoIP and Video phones
Personal Media Players
www.altera.com/enpirion
Rev D
