en5311qi-e Enpirion, en5311qi-e Datasheet

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en5311qi-e

Manufacturer Part Number
en5311qi-e
Description
1a Synchronous Buck Regulator With Integrated Inductor
Manufacturer
Enpirion
Datasheet
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 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
• 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.
03799
ENABLE
Thermal Limit
Current Limit
Soft Start
UVLO
(+)
(-)
Generator
Sawtooth
Comp
PWM
Logic
VREF
Compensation
Network
Error
Amp
(-)
(+)
P-Drive
N-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
11/24/2009
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
4.7μF
Voltage
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
Rev:B

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en5311qi-e 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

... 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 11/24/2009 EN5311QI Sense pin for output Connect V to the SENSE = 0.603V. FB ≥ 1.4V. HIGH ≤ 0.2V. Logic high is defined LOW www ...

Page 3

... PWM Comp (+) Sawtooth Generator Figure 3. Functional block diagram. ©Enpirion 2009 all rights reserved, E&OE 03799 P-Drive Logic N-Drive Compensation Network (-) Switch Error Amp (+) DAC Voltage VREF Select VS0 VS1 VS2 3 11/24/2009 EN5311QI OUT GND V SENSE V FB Package Boundry www.enpirion.com Rev:B ...

Page 4

... Thermal Resistance: Junction to Ambient (0 LFM) Thermal Resistance: Junction to Case (0 LFM) Thermal Shutdown Thermal Shutdown Hysteresis ©Enpirion 2009 all rights reserved, E&OE 03799 SYMBOL STG SYMBOL OUT T 4 11/24/2009 EN5311QI MIN MAX UNITS -0.3 7.0 -0 0.3 IN -0.3 2.7 -65 150 260 2000 MIN MAX UNITS 2.4 5.5 IN 2.4 6 ...

Page 5

... ENABLE pin crosses its logic High threshold UVLO 5 11/24/2009 = 4.7μF, C =10uF. IN OUT MIN TYP MAX 2.4 5.5 1 2.4 6.6 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 0.75 800 1.4 2 0.0 0.4 1 0.0 0.2 1 340 270 .110 1.24 1.65 2.1 0.80 1.10 1.40 www.enpirion.com EN5311QI UNITS V/mS mA μA μ μA MHz mΩ mΩ Ω V/mS mS Rev:B ...

Page 6

... V V out out 50mV/Div 50mV/Div I I Load Load 500mA/Div 500mA/Div load load Output Ripple 10µF 0805 V 6 11/24/2009 EN5311QI 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Load Current (A) = 2.5 V, 1.8 V, 1.5 V, 1.2 V, 0.8 V OUT = 5.0V = 5.0V 400μs/Div 400μs/Div = 3.3V = 3.3V = 3.3V = 3.3V 20μs/Div 20μs/Div ...

Page 7

... OUT the Power MOSFETS and the integrated inductor. The EN5311QI operates in a constant slew rate when the output voltage is programmed with an internal VID code. The EN5311QI, when in external resistor divider mode, has constant start up time. Electrical Characteristics table for soft-start ...

Page 8

... Under Voltage Lockout 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. ...

Page 9

... External Voltage Divider As described above, the external voltage divider option is chosen by connecting the VS0, VS1, and VS2 pins to V The EN5311QI uses a separate feedback pin, VFB, when using the external divider. For applications with V ≤ 5.5V, VSENSE must IN be connected to VOUT as indicated in Figure 4. ...

Page 10

... PCB Layout file downloadable from the Enpirion Website to assure first pass design success. Recommendation 1: Input and output filter capacitors should be placed on the same side of the PCB, and as close to the EN5311QI package as possible. They should be connected to the device with very short and wide traces. Do not use thermal reliefs or spokes when connecting the capacitor pads to the respective nodes ...

Page 11

... PCB layer 2 immediately underneath the EN5311QI and its input and output capacitors. The vias that connect the input and output capacitor grounds, and the thermal pad to the ground island, should continue through to the PCB GND layer as well ...

Page 12

... 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 9 represents the area that should be clear of any metal (traces, vias, or planes), on the top layer of the PCB ...

Page 13

... PCB. JEDEC minimum separation = 0.20 JEDEC minimum separation = 0.20 Figure 10. Exposed pad clearances; the Enpirion lead frame package complies with JEDEC requirements. ©Enpirion 2009 all rights reserved, E&OE 03799 0.25 0.25 0.25 0.25 0.20 0.20 0.20 0.20 0.20 0.20 13 11/24/2009 EN5311QI Thermal Pad. Connect to Ground plane www.enpirion.com Rev:B ...

Page 14

... Figure 11. Recommended solder mask opening. ©Enpirion 2009 all rights reserved, E&OE 03799 14 11/24/2009 EN5311QI www.enpirion.com Rev:B ...

Page 15

... Figure 12. Package mechanical dimensions. ©Enpirion 2009 all rights reserved, E&OE 03799 15 11/24/2009 EN5311QI www.enpirion.com Rev:B ...

Page 16

... Ordering Information Part Number EN5311QI EN5311QI-E Contact Information Enpirion, Inc. Perryville III 53 Frontage Road, Suite 210 Hampton, NJ 08827 USA Phone: +1 908-894-6000 Fax: +1 908-894-6090 www.enpirion.com Enpirion reserves the right to make changes in circuit design and/or specifications at any time without notice. Information furnished by Enpirion is believed to be accurate and reliable ...

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