Enpirion Power Datasheet
EN5311QI 1A PowerSoC
Synchronous Buck Regulator
With Integrated Inductor
Product Overview
Featuring Integrated Inductor Technology
V
IN The Ultra-Low-Profile EN5311QI is targeted to
applications where board area and profile are
UVLO critical. EN5311QI is a complete power
Thermal Limit
conversion solution requiring only two low cost
Current Limit
ceramic MLCC caps. Inductor, MOSFETS,
ENABLE Soft Start
PWM, and compensation are integrated into a
P-Drive
tiny 5mm x 4mm x 1.1mm QFN package. The
Logic V
(-) OUT
PWM
Comp N-Drive
EN5311QI is engineered to simplify design and
(+)
GND
to minimize layout constraints. 4 MHz
V
Sawtooth SENSE
Generator
switching frequency and internal type III
Compensation
Network
compensation provides superior transient
response. With a 1.1 mm profile, the
(-) Switch
Error
V
FB
Amp
EN5311QI is ideal for space and height
(+)
constrained applications.
DAC
Voltage
VREF
Select
A 3-pin VID output voltage selector provides
Package Boundry
seven pre-programmed output voltages along
VS0 VS1
VS2
with an option for external resistor divider.
Output voltage can be programmed on-the-fly
to provide fast, dynamic voltage scaling.
Product Highlights
Typical Application Circuit
Revolutionary Integrated Inductor
VSENSE
ENABLE
V
OUT
5mm x 4mm x1.1mm QFN package V
IN
VIN
VOUT
Very small total solution foot print*
C
4.7F OUT
EN5311QI
4 MHz switching frequency
Only two low cost MLCC caps required
VS0 VFB
VOLTAGE
VS1
Designed for low noise/low EMI
SELECT
VS2
GND
Very low ripple voltage; 5mV Typical
p-p
High efficiency, up to 95%
Wide 2.4V to 6.6V input range
Figure 1. Typical application circuit.
1000mA continuous output current
Applications
Less than 1 A standby current.
Excellent transient performance Area constrained applications
Noise Sensitive Applications such as A/V
3 Pin VID Output Voltage select
and RF
External divider: 0.6V to V -V
IN dropout
LDO replacement for improved thermals
100% duty cycle capable
Set top box/home gateway
Short circuit and over current protection
Smart phones, PDAs
UVLO and thermal protection
VoIP and Video phones
RoHS compliant; MSL 3 260C reflow
Personal Media Players
1 www.altera.com/enpirion
03799 December 14, 2015 Rev G EN5311QI
Pin Description
other or to any external signal, voltage, or
ground. One or more of these pins may be
connected internally.
VSENSE (Pin 15): Sense pin for output
voltage regulation. Connect V to the
SENSE
output voltage rail as close to the terminal of
the output filter capacitor as possible.
VFB (Pin 16): Feedback pin for external divider
option. When using the external divider option
(VS0=VS1=VS2= high) connect this pin to the
center of the external divider. Set the divider
such that V = 0.603V.
FB
VS0,VS1,VS2 (Pin 17,18,19): Output voltage
Figure 2. Pin description, top view.
select. VS0=pin19, VS1=pin18, VS2=pin17.
Selects one of seven preset output voltages or
VIN (Pin 1,2): Input voltage pin. Supplies
choose external divider by connecting pins to
power to the IC.
logic high or low. Logic low is defined as V
LOW
0.4V. Logic high is defined as V 1.4V.
HIGH
Input GND: (Pin 3): Input power ground.
Any level between these two values is
Connect this pin to the ground terminal of the
indeterminate.
input capacitor. Refer to Layout
Recommendations for further details.
ENABLE (Pin 20): Output enable. Enable =
logic high, disable = logic low. Logic low is
Output GND: (Pin 4): Power ground. The
defined as V 0.2V. Logic high is defined
LOW
output filter capacitor should be connected
as V 1.4V. Any level between these two
HIGH
between this pin and V . Refer to Layout
OUT
values is indeterminate.
recommendations for further detail.
Bottom Thermal Pad: Device thermal pad to
VOUT (Pin 5,6,7): Regulated output voltage.
remove heat from package. Connect to PCB
surface ground pad and PCB internal ground
NC (Pin 8,9,10,11,12,13,14): These pins
plane (see layout recommendations).
should not be electrically connected to each
2 www.altera.com/enpirion
03799 December 14, 2015 Rev G