en5312q Enpirion, en5312q Datasheet

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en5312q

Manufacturer Part Number
en5312q
Description
1a Synchronous Buck Regulator With Integrated Inductor
Manufacturer
Enpirion
Datasheet

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Featuring Integrated Inductor Technology
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
• 3 Pin VID Output Voltage select
• External divider: 0.6V to V
• 4 MHz switching frequency
• 100% duty cycle capable
• Short circuit and over current protection
• UVLO and thermal protection
*Optimized PCB Layout file downloadable from the Enpirion Website to assure first pass design success.
ENABLE
Thermal Limit
Current Limit
Soft Start
UVLO
(+)
(-)
Generator
Sawtooth
PWM
Comp
Logic
VREF
Compensation
Network
Error
Amp
(-)
(+)
N-Drive
P-Drive
DAC
IN
-V
VS0 VS1 VS2
p-p
Voltage
Switch
Select
dropout
V
IN
Typical
Package Boundry
V
GND
V
V
OUT
SENSE
FB
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.
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.
switching frequency and internal type III
compensation
response.
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
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
V
IN
Voltage
4.7µF
Select
1A Synchronous Buck Regulator
V
V
V
ENABLE
V
With a 1.1 mm profile, the
S0
S1
S2
in
provides
With Integrated Inductor
GND
V
Sense
V
V
out
FB
Inductor, MOSFETS,
superior
10µF
EN5312QI
RoHS Compliant
Revised March 2007
V
OUT
transient
4 MHz

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en5312q Summary of contents

Page 1

... SENSE switching frequency and internal type III compensation Switch response EN5312QI is ideal for space and height constrained applications. Voltage Select A 3-pin VID output voltage selector provides Package Boundry VS0 VS1 VS2 seven pre-programmed output voltages along with an option for external resistor divider. ...

Page 2

... PCB internal ground plane (see layout recommendations). These pins 2 (Pin 15): Sense pin for output voltage Connect V to the output SENSE = 0.603V. FB HIGH ≤ 0.2V. Logic high is defined LOW ≥ 1.4V. Any level between these two www.enpirion.com EN5312QI LOW ≥ 1.4V. ...

Page 3

... ENABLE Soft Start (-) PWM Comp (+) Sawtooth Generator Figure 3. Functional block diagram. ©Enpirion 2007 all rights reserved, E&OE P-Drive Logic N-Drive Compensation Network (-) Error Amp (+) DAC VREF VS0 VS1 VS2 3 EN5312QI OUT GND V SENSE Switch V FB Voltage Select Package Boundry www.enpirion.com ...

Page 4

... I 0 1000 OUT T -40 + -40 +125 J SYMBOL TYP θ θ +150 J- 4.7µF, C =10uF. IN OUT MIN TYP 2.4 2.2 0.145 -2.0 -2.0 -2.0 -2.0 -2.0 -2.0 -2.0 0.591 0.603 0.615 www.enpirion.com EN5312QI UNITS °C °C V UNITS °C °C UNITS °C/W °C/W °C °C MAX UNITS 5 +2.0 +2.0 +2.0 % +2.0 +2.0 +2.0 +2.0 V ...

Page 5

... OUT I Enable = Low SD No switching 2.4V ≤ V ≤ 5.5V LIM 0.6V ≤ V ≤ V – 0.6V OUT IN Pin = Low V TH Pin = High I VSX Logic Low Logic High 3. OSC DS(ON) DS(ON) T Vout = 3. EN5312QI MIN TYP MAX UNITS 1 nA -3.0 +3.0 -3.0 +3.0 -3.0 +3.0 % -3.0 +3.0 -3.0 +3.0 -3.0 +3.0 -3.0 +3.0 V 0.585 0.603 0.621 .05 %/V .0003 %/mA 1.65 V/mS 1000 mA µA 0.75 µ ...

Page 6

... 3.3V = 3.3V OUT OUT Transient Response Transient Response 3.3V = 3.3V 20µs/Div 20µs/Div 1.8V = 1.8V OUT OUT 100mA to 800mA = 100mA to 800mA load load V = 5.0V 200ns/Div 3.3V OUT Output Cap = µF 0805 www.enpirion.com EN5312QI 950 950 ...

Page 7

... March 2007 Detailed Description Functional Overview The EN5312QI is a complete DCDC converter solution requiring only two low cost MLCC capacitors. MOSFET controller, Gate-drive, compensation, inductor are integrated into the tiny 5mm x 4mm x 1.1mm package to provide the smallest footprint possible while efficiency, low ripple, and high performance. ...

Page 8

... A logic high will Application Information Output Voltage Select To provide the highest degree of flexibility in choosing output voltage, the EN5312QI uses a 3 pin VID, or Voltage ID, output voltage select arrangement. This allows the designer to choose one of seven preset voltages use an external voltage divider ...

Page 9

... OUT 0. – 0.6V (0.6 is the nominal full load IN dropout voltage including margin). Dynamically Adjustable Output The EN5312QI is designed to allow for dynamic switching between the predefined VID voltage levels The inter-voltage slew rate is optimized to prevent excess undershoot or overshoot as the output transition ...

Page 10

... PCB GND layer as well. Recommendation 6: As with any switch-mode DC/DC converter, do not run sensitive signal or control lines underneath the converter package. Figure 5 shows an example schematic for the EN5312QI using the internal voltage select. In this example, the device is set VS2 17 ...

Page 11

... PC board. The PCB top layer under the EN5312QI should be clear of any metal except for the large thermal pad. The “grayed-out” area in Figure 8 represents the area that should be clear of any metal (traces, vias, or planes), on the top layer of the PCB ...

Page 12

... PCB. JEDEC minimum separation = 0.20 JEDEC minimum separation = 0.20 Figure 9. Exposed pad clearances; the Enpirion lead frame package complies with JEDEC requirements. ©Enpirion 2007 all rights reserved, E&OE 0.25 0.25 0.25 0.25 0.20 0.20 0.20 0.20 0.20 0.20 12 EN5312QI Thermal Pad. Connect to Ground plane e www.enpirion.com ...

Page 13

... March 2007 Figure 10. Recommended solder mask opening. ©Enpirion 2007 all rights reserved, E&OE 13 EN5312QI www.enpirion.com ...

Page 14

... March 2007 Figure 11. Package mechanical dimensions. ©Enpirion 2007 all rights reserved, E&OE 14 EN5312QI www.enpirion.com ...

Page 15

... External resistor divider V programming OUT 6A DCDC with integrated inductor; 12mm x 10mm x 1.85mm QFN package 3-Pin VID V programming; Parallel Capable OUT 6A DCDC with integrated inductor; 12mm x 10mm x 1.85mm QFN package External resistor divider V programming; Parallel Capable OUT 15 EN5312QI Tape & Reel www.enpirion.com ...

Page 16

... Enpirion assumes no responsibility for its use or for infringement of patents or other third party rights, which may result from its use. Enpirion products are not authorized for use in nuclear control systems, as critical components in life support systems or equipment used in hazardous environment without the express written authority from Enpirion. ©Enpirion 2007 all rights reserved, E&OE 16 EN5312QI www.enpirion.com ...

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