en5311 Enpirion, en5311 Datasheet

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en5311

Manufacturer Part Number
en5311
Description
1a Synchronous Buck Regulator With Integrated Inductor
Manufacturer
Enpirion
Datasheet

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Featuring Integrated Inductor Technology
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
• High efficiency, up to 95%
• Wide 2.4V to 5.5V 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
• 100% duty cycle capable
• Short circuit and over current protection
• UVLO and thermal protection
• RoHS compliant; MSL 3 260°C reflow
*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 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.
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.
switching frequency and internal type III
compensation
response.
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.
Typical Application Circuit
Figure 1. Typical application circuit.
Applications
• Area constrained applications
• Noise Sensitive Applications such as A/V
• LDO replacement for improved thermals
• Set top box/home gateway
• Smart phones, PDAs
• VoIP and Video phones
• Personal Media Players
and RF
V
IN
1A Synchronous Buck Regulator
Voltage
4.7µF
Select
With a 1.1 mm profile, the
provides
With Integrated Inductor
V
V
V
ENABLE
V
S0
S1
S2
in
GND
Inductor, MOSFETS,
V
Sense
V
V
superior
out
FB
EN5311QI
RoHS Compliant
Halogen Free
10µF
transient
V
4 MHz
OUT

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en5311 Summary of contents

Page 1

... EN5311QI is engineered to simplify design and to minimize layout constraints. GND switching frequency and internal type III V SENSE compensation response. Switch EN5311QI is ideal for space and height V FB constrained applications. A 3-pin VID output voltage selector provides Voltage Select seven pre-programmed output voltages along Package Boundry with an option for external resistor divider ...

Page 2

... HIGH values is indeterminate. Bottom Thermal Pad: Device thermal pad to remove heat from package. Connect to PCB surface ground pad and PCB internal ground plane (see layout recommendations). These pins 2 EN5311QI Connect V to the output SENSE = 0.603V. FB HIGH ≤ 0.2V. Logic high is defined LOW ≥ ...

Page 3

... ENABLE Soft Start (-) PWM Comp (+) Sawtooth Generator Figure 3. Functional block diagram. ©Enpirion 2008 all rights reserved, E&OE P-Drive Logic N-Drive Compensation Network (-) Error Amp (+) DAC VREF VS0 VS1 VS2 3 EN5311QI OUT GND V SENSE Switch V FB Voltage Select Package Boundry www.enpirion.com ...

Page 4

... MAX -0.3 7 0.3 IN -0.3 2.7 -65 150 STG 260 2000 MIN MAX V 2.4 5 0.6 V -0.6 OUT 1000 OUT T -40 + -40 +125 J SYMBOL TYP θ θ +150 J-TP 15 www.enpirion.com EN5311QI UNITS °C °C V UNITS °C °C UNITS °C/W °C/W °C °C ...

Page 5

... OUT IN Pin = Low V TH Pin = High I VSX Logic Low Logic High 3. OSC DS(ON) DS(ON) V rise begins when ENABLE OUT goes high and V > UVLO 5 EN5311QI = 4.7µF, C =10uF. IN OUT MIN TYP MAX 2.4 5.5 2.2 2.3 0.145 -2.0 +2.0 -3.0 +3.0 0.591 0.603 0.615 0.585 0.603 0.621 1 1.24 1.65 2.1 1000 ...

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 Output Ripple 3 1.2V 1A 10µF 0805 OUT LOAD OUT www.enpirion.com EN5311QI 0.9 1 ...

Page 7

... March 2008 Detailed Description Functional Overview The EN5311QI 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

... Application Information Output Voltage Select To provide the highest degree of flexibility in choosing output voltage, the EN5311QI 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. output of the VID multiplexer sets the value for ...

Page 9

... OUT 0. – 0.6V (0.6 is the nominal full load IN dropout voltage including margin). Dynamically Adjustable Output The EN5311QI 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 EN5311QI using the internal voltage select. In this example, the device is set VS2 17 ...

Page 11

... Only the large thermal pad and the perimeter pin pads are to be mechanically or electrically connected to the PC board. The PCB top layer under the EN5311QI 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 2008 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 EN5311QI Thermal Pad. Connect to Ground plane www.enpirion.com ...

Page 13

... March 2008 Figure 10. Recommended solder mask opening. ©Enpirion 2008 all rights reserved, E&OE 13 EN5311QI www.enpirion.com ...

Page 14

... March 2008 Figure 11. Package mechanical dimensions. ©Enpirion 2008 all rights reserved, E&OE 14 EN5311QI 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 EN5311QI Tape & Reel programming OUT 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 2008 all rights reserved, E&OE 16 EN5311QI www.enpirion.com ...

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