EN5311QI
1A Synchronous Buck Regulator
With Integrated Inductor
RoHS Compliant
Halogen Free
Featuring Integrated Inductor Technology
V
IN
Product Overview
The Ultra-Low-Profile EN5311QI is targeted to
applications where board area and profile are
critical. EN5311QI 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
EN5311QI 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
EN5311QI is ideal for space and height
constrained applications.
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.
UVLO
Thermal Limit
Current Limit
ENABLE
Soft Start
P-Drive
(-)
PWM
Comp
(+)
Logic
N-Drive
V
OUT
GND
Sawtooth
Generator
Compensation
Network
V
SENSE
(-)
Error
Amp
(+)
Switch
V
FB
DAC
VREF
Voltage
Select
Package Boundry
VS0 VS1 VS2
Product Highlights
•
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; 5mV
p-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 V
IN
-V
dropout
•
100% duty cycle capable
•
Short circuit and over current protection
•
UVLO and thermal protection
•
RoHS compliant; MSL 3 260°C reflow
Typical Application Circuit
ENABLE
V
IN
4.7μF
V
Sense
V
OUT
10μF
EN5311QI
V
in
V
out
V
FB
Voltage
Select
V
S0
V
S1
V
S2
GND
Figure 1. Typical application circuit.
Applications
•
•
•
•
•
•
•
Area constrained applications
Noise Sensitive Applications such as A/V
and RF
LDO replacement for improved thermals
Set top box/home gateway
Smart phones, PDAs
VoIP and Video phones
Personal Media Players
*Optimized PCB Layout file downloadable from the Enpirion Website to assure first pass design success.
03799
11/24/2009
Rev:B
ENPIRION [ ENPIRION, INC. ]
