EN5312QI Datasheet, PDF (1/16 Pages) Enpirion, Inc. – 1A Synchronous Buck Regulator With Integrated Inductor

EN5312QI
1A Synchronous Buck Regulator
With Integrated Inductor
Revised March 2007
RoHS Compliant
Featuring Integrated Inductor Technology
V_IN
ENABLE
UVLO
Thermal Limit
Current Limit
Soft Start
(-)
PWM
Comp
(+)
Sawtooth
Generator
Logic
P-Drive
N-Drive
Compensation
Network
(-)
Error
Amp
(+)
VREF
DAC
Switch
V_OUT
GND
V_SENSE
V_FB
Voltage
Select
Package Boundry
VS0 VS1 VS2
Product Highlights
• Integrated Planar Inductor
• Designed for low noise/low EMI
• Very small solution foot print*
• Only two low cost MLCC caps required
• RoHS compliant; MSL 3 260°C reflow
• 5mm x 4mm x1.1mm QFN package
• Wide 2.4V to 5.5V input range
• 1000mA continuous output current
• Less than 1 µA standby current.
• High efficiency, up to 95%
• Excellent transient performance
• Very low ripple voltage; 5mV_p-p Typical
• 3 Pin VID Output Voltage select
• External divider: 0.6V to V_IN-V_dropout
• 4 MHz switching frequency
• 100% duty cycle capable
• Short circuit and over current protection
• UVLO and thermal protection
Product Overview
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.
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.
Typical Application Circuit
V_IN
4.7µF
Voltage
Select
ENABLE
V_in
V_Sense
V_out
V_FB
V_S0
V_S1
V_S2
GND
V_OUT
10µF
Figure 1. Typical application circuit.
Applications
• LDO replacement for improved thermals
• FPGA, DSP, ASIC, IO & Peripherals
• Area constrained applications
• Set top box/home gateway
• Smart phones and PDAs
• VoIP and Video phones
• Personal Media Players
*Optimized PCB Layout file downloadable from the Enpirion Website to assure first pass design success.