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Datasheet> All Categories > Power/power management> The power supply circuit> EN5311QI-T
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EN5311QI-T

Description
Switching Regulator/Controller, Voltage-mode, 1A, 4000kHz Switching Freq-Max, MQCC20
CategoryPower/power management    The power supply circuit   
File Size357KB，16 Pages
ManufacturerIntel
Websitehttp://www.intel.com/
Environmental Compliance
Download Datasheet Parametric View All

EN5311QI-T Overview

Switching Regulator/Controller, Voltage-mode, 1A, 4000kHz Switching Freq-Max, MQCC20

EN5311QI-T Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
MakerIntel
package instructionQFN-20
Reach Compliance Codecompliant
ECCN codeEAR99
Other featuresOUTPUT IN ADJUSTABLE MODE 0.6V TO 4.9V
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeVOLTAGE-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage5.5 V
Minimum input voltage2.4 V
Nominal input voltage3.6 V
JESD-30 codeR-XQCC-N20
length5 mm
Humidity sensitivity level3
Number of functions1
Number of terminals20
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current1 A
Package body materialUNSPECIFIED
encapsulated codeHQCCN
Encapsulate equivalent codeLCC20,.16X.2,25
Package shapeRECTANGULAR
Package formCHIP CARRIER, HEAT SINK/SLUG
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.15 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency4000 kHz
Temperature levelINDUSTRIAL
Terminal formNO LEAD
Terminal pitch0.65 mm
Terminal locationQUAD
Maximum time at peak reflow temperatureNOT SPECIFIED
width4 mm

EN5311QI-T Preview

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 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
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.
March 2008
EN5311QI
Pin Description
ground. One or more of these pins may be
connected internally.
V
SENSE
(Pin 15): Sense pin for output voltage
regulation.
Connect V
SENSE
to the output
voltage rail as close to the terminal of the
output filter capacitor as possible.
V
FB
(Pin 16): Feed back pin for external divider
option. When using the external divider option
(VS0=VS1=VS2= high) connect this pin to the
center of the external divider. Set the divider
such that V
FB
= 0.603V.
VS0,VS1,VS2
(Pin 17,18,19): Output voltage
select. VS0=pin19, VS1=pin18, VS2=pin17.
Selects one of seven preset output voltages or
choose external divider by connecting pins to
logic high or low. Logic low is defined as V
LOW
≤
0.4V. Logic high is defined as V
HIGH
≥
1.4V.
Any level between these two values is
indeterminate.
ENABLE
(Pin 20): Output enable. Enable =
logic high, disable = logic low. Logic low is
defined as V
LOW
≤
0.2V. Logic high is defined
as V
HIGH
≥
1.4V. Any level between these two
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).
Figure 2. Pin description, top view.
V
IN
(Pin 1,2): Input voltage pin. Supplies power
to the IC. VIN can range from 2.4V to 5.5V.
Input GND:
(Pin 3): Input power ground.
Connect this pin to the ground terminal of the
input
capacitor.
Refer
to
Layout
Recommendations for further details.
Output GND:
(Pin 4): Power ground. The
output filter capacitor should be connected
between this pin and V
OUT
. Refer to Layout
recommendations for further detail.
V
OUT
(Pin 5,6,7): Regulated output voltage.
NC
(Pin 8,9,10,11,12,13,14): These pins
should not be electrically connected to each
other or to any external signal, voltage, or
©Enpirion
2008 all rights reserved, E&OE
2
www.enpirion.com
March 2008
EN5311QI
Functional Block Diagram
V
IN
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
Figure 3. Functional block diagram.
©Enpirion
2008 all rights reserved, E&OE
3
www.enpirion.com
March 2008
EN5311QI
Absolute Maximum Ratings
CAUTION: Absolute Maximum ratings are stress ratings only. Functional operation beyond
recommended operating conditions is not implied. Stress beyond absolute maximum ratings may
cause permanent damage to the device. Exposure to absolute maximum rated conditions for
extended periods may affect device reliability.
PARAMETER
Input Supply Voltage
Voltages on: ENABLE, V
SENSE
, V
S0
-V
S2
Voltage on: V
FB
Storage Temperature Range
Reflow Temp, 10 Sec, MSL3 JEDEC J-STD-020A
ESD Rating (based on Human Body Model)
SYMBOL
V
IN
T
STG
MIN
-0.3
-0.3
-0.3
-65
MAX
7.0
V
IN
+ 0.3
2.7
150
260
2000
UNITS
V
V
V
°C
°C
V
Recommended Operating Conditions
PARAMETER
Input Voltage Range
Output Voltage Range
Output Current
Operating Ambient Temperature
Operating Junction Temperature
SYMBOL
V
IN
V
OUT
I
OUT
T
A
T
J
MIN
2.4
0.6
0
-40
-40
MAX
5.5
V
IN
-0.6
1000
+85
+125
UNITS
V
V
mA
°C
°C
Thermal Characteristics
PARAMETER
Thermal Resistance: Junction to Ambient (0 LFM)
Thermal Resistance: Junction to Case (0 LFM)
Thermal Shutdown
Thermal Shutdown Hysteresis
SYMBOL
θ
JA
θ
JC
T
J-TP
TYP
65
15
+150
15
UNITS
°C/W
°C/W
°C
°C
©Enpirion
2008 all rights reserved, E&OE
4
www.enpirion.com
March 2008
EN5311QI
Electrical Characteristics
NOTE: T
A
= 25°C unless otherwise noted. Typical values are at VIN = 3.6V, C
IN
= 4.7µF, C
OUT
=10uF.
NOTE: V
IN
must be greater than V
OUT
+ 0.6V.
PARAMETER
Operating Input Voltage
Under Voltage Lockout
UVLO Hysteresis
V
OUT
Initial Accuracy
V
OUT
Variation for all
Causes
Feedback Pin Voltage
Feedback Pin Voltage
Feedback Pin Input Current
Dynamic Voltage Slew
Rate
†
Output Current
Shut-Down Current
Quiescent Current
PFET OCP Threshold
VS0-VS1 Thresholds
VS0-VS2 Pin Input Current
Enable Voltage Threshold
Enable Pin Input Current
Operating Frequency
PFET On Resistance
NFET On Resistance
Typical inductor DCR
Soft-Start Operation
V
OUT
Soft Start Slew Rate
†
I
EN
F
OSC
R
DS(ON)
R
DS(ON)
SYMBOL
TEST CONDITIONS
VIN going low to high
2.4V
≤
V
IN
≤
5.5V, I
LOAD
= 100mA;
T
A
= 25C
2.4V
≤
V
IN
≤
5.5V, I
LOAD
= 0 - 1A,
T
A
= -40°C to +85°C
2.4V
≤
V
IN
≤
5.5V, I
LOAD
= 100mA
TA = 25C; VSO=VS1=VS2=1
2.4V
≤
V
IN
≤
5.5V, I
LOAD
= 0 - 1A,
T
A
= -40°C to +85°C;
VSO=VS1=VS2=1
V
IN
V
UVLO
V
OUT
V
OUT
V
FB
V
FB
I
FB
V
slew
I
OUT
I
SD
I
LIM
V
TH
I
VSX
MIN
2.4
TYP
2.2
0.145
MAX
5.5
2.3
UNITS
V
V
V
-2.0
-3.0
0.591
0.585
0.603
0.603
1
1.24
1000
1.65
0.75
800
1.4
0.0
1.4
1
0.0
1.4
2
4
340
270
.110
1.24
1.65
2
+2.0
+3.0
0.615
0.621
%
%
V
V
nA
2.1
V/mS
mA
µA
µA
A
Enable = Low
No switching
2.4V
≤
V
IN
≤
5.5V,
0.6V
≤
V
OUT
≤
V
IN
– 0.6V
Pin = Low
Pin = High
Logic Low
Logic High
V
IN
= 3.6V
0.4
V
IN
nA
0.2
V
IN
V
µA
MHz
mΩ
mΩ
Ω
2.1
V/mS
V
OUT
rise begins when ENABLE
goes high and V
IN
> V
UVLO
† Parameter guaranteed by design.
©Enpirion
2008 all rights reserved, E&OE
5
www.enpirion.com
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