ENPIRION EP5358LUI-E 500ma synchronous buck regulator with integrated inductor Datasheet

EP5358LUI/EP5358HUI
500mA Synchronous Buck Regulator
with Integrated Inductor
RoHS Compliant; Halogen Free
Description
Features
The EP5358xUI (x = L or H) is a 500mA
PowerSOC. The EP5358xUI integrates MOSFET
switches, control, compensation, and the
magnetics in an advanced 2.5mm x 2.25mm
micro-QFN Package.
•
Integrated Inductor Technology
•
2.5mm x 2.25mm x 1.1mm uQFN package
•
Total Solution Footprint < 15mm2
•
Low VOUT ripple for RF compatibility
Integrated magnetics enables a tiny solution
footprint, low output ripple, low part-count, and
high reliability, while maintaining high efficiency.
The complete solution can be implemented in as
little as 15mm2.
•
High efficiency, up to 93%
•
500mA continuous output current
•
Less than 1µA standby current
•
5 MHz switching frequency
The EP5358xUI uses a 3-pin VID to easily select
the output voltage setting.
Output voltage
settings are available in 2 optimized ranges
providing coverage for typical VOUT settings.
•
3 pin VID for glitch free voltage scaling
•
VOUT Range 0.6V to VIN – 0.25V
•
Short circuit and over current protection
•
UVLO and thermal protection
•
IC level reliability in a PowerSOC solution
The VID pins can be changed on the fly for fast
dynamic voltage scaling. EP5358LUI further has
the option to use an external voltage divider.
The EP5358xUI is a perfect solution for noise
sensitive and space constrained applications that
require high efficiency.
5.4
mm
Application
•
Wireless and RF applications
•
Wireless broad band data cards
•
Smart phone and portable media players
•
Advanced Low Power Processors, DSP, IO,
Memory, Video, Multimedia Engines
VIN
AVIN
VSENSE
PVIN
VOUT
VOUT
ENABLE
EP5358HUI
EN5358xUI
Output Cap
10uF 0603
2.7
mm
Input Cap
2.2uF 0603
2.2uF
VS0
VS1
VS2
Figure 1: Total Solution Footprint (Not to Scale)
PGND
10uF
AGND
Figure 2: Typical Application Schematic
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Rev:A
EP5358LUI/EP5358HUI
LOW VID Range
16-pin QFN T&R
NC(SW)
1
EP5358HUI
HIGH VID Range
16-pin QFN T&R
PGND
2
EP5358LUI-E
EP5358LUI Evaluation Board
PGND
3
EP5358HUI-E
EP5358HUI Evaluation Board
VFB
4
VSENSE
5
AGND
6
NC(SW)
EP5358LUI
NC(SW)
Package
16
15
EP5358LUI
Comment
14
PVIN
13
AVIN
12 ENABLE
11
VS0
10 VS1
9
7
8
VOUT
Part Number
Pin Assignments (Top View)
VOUT
Ordering Information
VS2
2
PGND
3
NC
4
VSENSE
5
AGND
6
14
PVIN
13
AVIN
NC(SW)
12 ENABLE
11
VS0
10 VS1
9
7
8
VOUT
PGND
15
EP5358HUI
1
16
VOUT
NC(SW)
NC(SW)
Figure 3: EP5358LUI Pin Out Diagram (Top View)
VS2
Figure 4: EP5358HUI Pin Out Diagram (Top View)
Pin Description
PIN
NAME
1, 15,
16
NC(SW)
2,3
PGND
4
VFB/NC
5
VSENSE
6
AGND
7, 8
VOUT
9, 10,
11
VS2, VS1,
VS0
FUNCTION
NO CONNECT – These pins are internally connected to the common switching node of the
internal MOSFETs. NC (SW) pins are not to be electrically connected to any external signal,
ground, or voltage. However, they must be soldered to the PCB. Failure to follow this
guideline may result in part malfunction or damage to the device.
Power ground. Connect this pin to the ground electrode of the Input and output filter
capacitors.
EP5358LUI: Feed back pin for external divider option.
EP5358HUI: No Connect
Sense pin for preset output voltages. Refer to application section for proper configuration.
Analog ground. This is the quiet ground for the internal control circuitry, and the ground
return for external feedback voltage divider
Regulated Output Voltage. Refer to application section for proper layout and decoupling.
Output voltage select. VS2 = pin 9, VS1 = pin 10, VS0 = pin 11.
EP5358LUI: Selects one of seven preset output voltages or an external resistor divider.
EP5358HUI: Selects one of eight preset output voltages.
(Refer to section on output voltage select for more details.)
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EP5358LUI/EP5358HUI
PIN
NAME
12
13
14
ENABLE
AVIN
PVIN
FUNCTION
Output Enable. Enable = logic high; Disable = logic low
Input power supply for the controller circuitry.
Input Voltage for the MOSFET switches.
Absolute Maximum Ratings
CAUTION: Absolute Maximum ratings are stress ratings only. Functional operation beyond the
recommended operating conditions is not implied. Stress beyond the absolute maximum ratings may
cause permanent damage to the device. Exposure to absolute maximum rated conditions for
extended periods may affect device reliability.
PARAMETER
SYMBOL
MIN
MAX
UNITS
VIN
-0.3
6.0
V
Voltages on: ENABLE, VSENSE, VSO – VS2
-0.3
VIN+ 0.3
V
Voltages on: VFB (EP5358LUI)
-0.3
2.7
V
150
°C
150
°C
Reflow Temp, 10 Sec, MSL3 JEDEC J-STD-020C
260
°C
ESD Rating (based on Human Body Mode)
2000
V
Input Supply Voltage
Maximum Operating Junction Temperature
TJ-ABS
Storage Temperature Range
TSTG
-65
Recommended Operating Conditions
SYMBOL
MIN
MAX
UNITS
Input Voltage Range
PARAMETER
VIN
2.4
5.5
V
Operating Ambient Temperature
TA
-40
+85
°C
Operating Junction Temperature
TJ
-40
+125
°C
Thermal Characteristics
PARAMETER
Thermal Resistance: Junction to Ambient –0 LFM (Note 1)
Thermal Overload Trip Point
Thermal Overload Trip Point Hysteresis
SYMBOL
TYP
UNITS
θJA
85
°C/W
TJ-TP
+155
°C
25
°C
Note 1: Based on a four layer copper board and proper thermal design per JEDEC EIJ/JESD51 standards
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EP5358LUI/EP5358HUI
Electrical Characteristics
NOTE: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = 25°C, VIN = 3.6V.
CIN = 2.2µF 0603 MLCC, COUT = 10µF 0805 MLCC
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
Operating Input Voltage
Range
VIN
Under Voltage Lock-out –
VIN Rising
VUVLO_R
2.0
V
Under Voltage Lock-out –
VIN Falling
VUVLO_F
1.9
V
Drop Out Resistance
RDO
Input to Output Resistance
Output Voltage Range
VOUT
EP5358LUI (VDO = ILOAD X RDO)
EP5358HUI
Dynamic Voltage Slew
Rate
VSLEW
EP5358LUI
EP5358HUI
VID Preset VOUT Initial
Accuracy
ΔVOUT
TA = 25°C, VIN = 3.6V;
ILOAD = 100mA ;
0.8V ≤ VOUT ≤ 3.3V
Line Regulation
ΔVOUT_LINE
2.4V ≤ VIN ≤ 5.5V
0.03
%/V
Load Regulation
ΔVOUT_LOAD
0A ≤ ILOAD ≤ 600mA
0.48
%/A
Temperature Variation
ΔVOUT_TEMPL
-40°C ≤ TA ≤ +85°C
24
ppm/°C
Output Current
IOUT
600
mA
Shut-down Current
ISD
Enable = Low
0.75
µA
OCP Threshold
ILIM
2.4V ≤ VIN ≤ 5.5V
0.6V ≤ VOUT ≤ 3.3V
1.25
1.4
A
Feedback Pin Voltage
Initial Accuracy
VFB
TA = 25°C, VIN = 3.6V;
ILOAD = 100mA ;
0.8V ≤ VOUT ≤ 3.3V
.588
0.6
Feedback Pin Input
Current
IFB
Note 1
VS0-VS2, Pin Logic Low
VVSLO
0.0
0.3
V
VS0-VS2, Pin Logic High
VVSHI
1.4
VIN
V
VS0-VS2, Pin Input
Current
IVSX
Enable Pin Logic Low
VENLO
Enable Pin Logic High
VENHI
Enable Pin Current
IENABLE
Operating Frequency
FOSC
2.4
350
0.6
1.8
MAX
UNITS
5.5
V
500
VIN-VDO
3.3
4
8
+2
0.612
<100
Note 1
V
nA
0.3
1.4
%
nA
<100
Note 1
V
V/mS
-2
500
mΩ
V
V
<100
nA
5
MHz
8
4
V/mS
Soft Start Operation
Soft Start Slew Rate
ΔVSS
EP5358HUI
EP5358LUI
Note 1: Parameter guaranteed by design
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EP5358LUI/EP5358HUI
95
90
85
80
75
70
65
60
55
50
45
Efficiency (%)
Efficiency (%)
Typical Performance Characteristics
0
200
400
Load Current (mA)
600
0
Efficiency vs. Load Current: VIN = 5.0V, VOUT (from
top to bottom) = 3.3, 2.5, 1.8, 1.2V
Efficiency (%)
95
90
85
80
75
70
65
60
55
50
45
200
400
Load Current (mA)
600
Efficiency vs. Load Current: VIN = 3.7V, VOUT (from
top to bottom) = 2.5, 1.8, 1.2V
95
90
85
80
75
70
65
60
55
50
45
0
200
400
Load Current (mA)
600
Efficiency vs. Load Current: VIN = 3.3V, VOUT (from
top to bottom) = 2.5, 1.8, 1.2V
Start Up Waveform: VIN = 5.0V, VOUT = 3.3V;
ILOAD = 1000mA
Start Up Waveform: VIN = 5.0V, VOUT = 3.3V;
ILOAD = 10mA
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EP5358LUI/EP5358HUI
Shut-down Waveform: VIN = 5.0V, VOUT = 3.3V;
ILOAD = 10mA
Shut-down Waveform: VIN = 5.0V, VOUT = 3.3V;
ILOAD = 500mA
Output Ripple: VIN = 5.0V, VOUT = 1.2V,
Load = 500mA
Output Ripple: VIN = 5.0V, VOUT = 3.3V
Load = 500mA
Output Ripple: VIN = 3.3V, VOUT = 1.8V
Load = 500mA
Output Ripple: VIN = 3.3V, VOUT = 1.2V,
Load = 500mA
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Rev:A
EP5358LUI/EP5358HUI
Load Transient: VIN = 3.3V, VOUT = 1.8V
Load stepped from 10mA to 500mA
Load Transient: VIN = 5.0V, VOUT = 1.2V
Load stepped from 10mA to 500mA
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EP5358LUI/EP5358HUI
Functional Block Diagram
PVIN
EP5358UI
UVLO
Thermal Limit
Current Limit
ENABLE
NC(SW)
Soft Start
P-Drive
(-)
Logic
VOUT
PWM
Comp
(+)
N-Drive
GND
VSENSE
Sawtooth
Generator
Compensation
Network
(-)
Switch
Error
Amp
VFB
(+)
DAC
Voltage
Select
VREF
Package Boundry
AVIN
VS0 VS1 VS2
AGND
Figure 5: Functional Block Diagram
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EP5358LUI/EP5358HUI
Detailed Description
Functional Overview
Integrated Inductor: Low-Noise Low-EMI
The EP5358xUI requires only 2 small MLCC
capacitors for a complete DC-DC converter
solution.
The device integrates MOSFET
switches,
PWM
controller,
Gate-drive,
compensation, and inductor into a tiny 3mm x
3mm x 1.1mm micro-QFN package. Advanced
package design, along with the high level of
integration, provides very low output ripple and
noise. The EP5358xUI uses voltage mode
control for high noise immunity and load
matching to advanced ≤90nm loads. A 3-pin
VID allows the user to choose from one of 8
output voltage settings.
The EP5358xUI
comes with two VID output voltage ranges.
The EP5358HUI provides VOUT settings from
1.8V to 3.3V, the EP5358LUI provides VID
settings from 0.8V to 1.5V, and also has an
external resistor divider option to program
output setting over the 0.6V to VIN-0.25V
range. The EP5358xUI provides the industry’s
highest power density of any 500mA DCDC
converter solution.
The EP5358xUI utilizes a proprietary low loss
integrated inductor. The integration of the
inductor greatly simplifies the power supply
design process. The inherent shielding and
compact construction of the integrated inductor
reduces the conducted and radiated noise that
can couple into the traces of the printed circuit
board.
Further, the package layout is
optimized to reduce the electrical path length
for the high di/dT input AC ripple currents that
are a major source of radiated emissions from
DC-DC converters. The integrated inductor
provides the optimal solution to the complexity,
output ripple, and noise that plague low power
DCDC converter design.
The key enabler of this revolutionary
integration is Enpirion’s proprietary power
MOSFET technology. The advanced MOSFET
switches are implemented in deep-submicron
CMOS to supply very low switching loss at high
switching frequencies and to allow a high level
of integration. The semiconductor process
allows seem-less integration of all switching,
control, and compensation circuitry.
The proprietary magnetics design provides
high-density/high-value magnetics in a very
small footprint.
Enpirion magnetics are
carefully matched to the control and
compensation circuitry yielding an optimal
solution with assured performance over the
entire operating range.
Protection features include under-voltage lockout (UVLO), over-current protection (OCP),
short circuit protection, and thermal overload
protection.
Control Matched to sub 90nm Loads
The EP5358xUI utilizes an integrated type III
compensation network. Voltage mode control
is inherently impedance matched to the sub
90nm process technology that is used in
today’s advanced ICs. Voltage mode control
also provides a high degree of noise immunity
at light load currents so that low ripple and high
accuracy are maintained over the entire load
range. The very high switching frequency
allows for a very wide control loop bandwidth
and hence excellent transient performance.
Soft Start
Internal soft start circuits limit in-rush current
when the device starts up from a power down
condition or when the “ENABLE” pin is
asserted “high”. Digital control circuitry limits
the VOUT ramp rate to levels that are safe for
the Power MOSFETS and the integrated
inductor.
The EP5358HUI has a soft-start slew rate that
is twice that of the EP5358LUI.
Excess bulk capacitance on the output of the
device can cause an over-current condition at
startup. The maximum total capacitance on
the output, including the output filter capacitor
and bulk and decoupling capacitance, at the
load, is given as:
EP5358LUI:
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EP5358LUI/EP5358HUI
COUT_TOTAL_MAX = COUT_Filter + COUT_BULK = 200uF
EP5358HUI:
COUT_TOTAL_MAX = COUT_Filter + COUT_BULK = 100uF
The nominal value for COUT is 10uF. See the
applications section for more details.
Over Current/Short Circuit Protection
The current limit function is achieved by
sensing the current flowing through a sense PMOSFET which is compared to a reference
current. When this level is exceeded the PFET is turned off and the N-FET is turned on,
pulling VOUT low. This condition is maintained
for approximately 0.5mS and then a normal
soft start is initiated. If the over current
condition still persists, this cycle will repeat.
Under Voltage Lockout
During initial power up an under voltage
lockout circuit will hold-off the switching
circuitry until the input voltage reaches a
sufficient level to insure proper operation. If
the voltage drops below the UVLO threshold
the lockout circuitry will again disable the
switching. Hysteresis is included to prevent
chattering between states.
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03541
Enable
The ENABLE pin provides a means to shut
down the converter or enable normal
operation.
A logic low will disable the
converter and cause it to shut down. A logic
high will enable the converter into normal
operation.
NOTE: The ENABLE pin must not be left
floating.
Thermal Shutdown
When excessive power is dissipated in the
chip, the junction temperature rises. Once the
junction temperature exceeds the thermal
shutdown temperature the thermal shutdown
circuit turns off the converter output voltage
thus allowing the device to cool. When the
junction temperature decreases by 15C°, the
device will go through the normal startup
process.
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EP5358LUI/EP5358HUI
Application Information
VIN
PVIN
VOUT
AVIN
VSENSE
ENABLE
2.2μF
0603
VOUT
10μF
0603
VS0
PGND AGND
Figure 6: Application Circuit, EP5358HUI,.
VIN
PVIN
VOUT
AVIN
VSENSE
ENABLE
2.2μF
0603
VFB
VS0
NOTE: The VID pins must not be left floating.
EP5358L Low VID Range Programming
VS1
VS2
input of the error amplifier. This allows the use
of a single feedback divider with constant loop
gain and optimum compensation, independent
of the output voltage selected.
VOUT
10μF
0603
The EP5358LUI is designed to provide a high
degree of flexibility in powering applications
that require low VOUT settings and dynamic
voltage scaling (DVS). The device employs a
3-pin VID architecture that allows the user to
choose one of seven (7) preset output voltage
settings, or the user can select an external
voltage divider option. The VID pin settings
can be changed on the fly to implement glitchfree voltage scaling.
Table 1: EP5358LUI VID Voltage Select Settings
VS1
VS2
PGND AGND
VS2
0
0
0
0
1
1
1
1
Figure 7: Application Circuit, EP5358LUI, showing
the VFB function.
Output Voltage Programming
The EP5358xUI utilizes a 3-pin VID to program
the output voltage value. The VID is available
in two sets of output VID programming ranges.
The VID pins should be connected either to
AVIN or to AGND to avoid noise coupling into
the device.
The “Low” range is optimized for low voltage
applications. It comes with preset VID settings
ranging from 0.80V and 1.5V. This VID set
also has an external divider option.
To specify this VID range, order part number
EP5358LUI.
The “High” VID set provides output voltage
settings ranging from 1.8V to 3.3V. This
version does not have an external divider
option. To specify this VID range, order part
number EP5358HUI.
Internally, the output of the VID multiplexer
sets the value for the voltage reference DAC,
which in turn is connected to the non-inverting
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03541
VS1
0
0
1
1
0
0
1
1
VS0
0
1
0
1
0
1
0
1
VOUT
1.50
1.45
1.20
1.15
1.10
1.05
0.8
EXT
Table 1 shows the VS2-VS0 pin logic states for
the EP5358LUI and the associated output
voltage levels.
A logic “1” indicates a
connection to AVIN or to a “high” logic voltage
level. A logic “0” indicates a connection to
AGND or to a “low” logic voltage level. These
pins can be either hardwired to AVIN or AGND
or alternatively can be driven by standard logic
levels. Logic levels are defined in the electrical
characteristics table. Any level between the
logic high and logic low is indeterminate.
EP5358LUI External Voltage Divider
The external divider option is chosen by
connecting VID pins VS2-VS0 to VIN or a logic
“1” or “high”. The EP5358LUI uses a separate
feedback pin, VFB, when using the external
divider. VSENSE must be connected to VOUT as
indicated in Figure 8. The output voltage is
selected by the following formula:
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EP5358LUI/EP5358HUI
VOUT = 0.6V (1 +
PVIN
VIN
VS0
VS1
EP5358L
ENABLE
VS2
)
Table 2: EP5358HUI VID Voltage Select Settings
VSense
AVIN
2.2uF
0603
Ra
Rb
VS2
0
0
0
0
1
1
1
1
VOUT
VOUT
Ra
10μF
0603
VFB
Rb
PGND AGND
VS1
0
0
1
1
0
0
1
1
VS0
0
1
0
1
0
1
0
1
VOUT
3.3
3.0
2.9
2.6
2.5
2.2
2.1
1.8
Input Filter Capacitor
Figure 8: EP5358LUI using external divider
Ra must be chosen as 237KΩ to maintain loop
gain. Then Rb is given as:
Rb =
142.2 x10 3
Ω
VOUT − 0.6
VOUT can be programmed over the range of
0.6V to (VIN – 0.25V).
NOTE: Dynamic Voltage Scaling is not allowed
between internal preset voltages and external
divider.
EP5358HUI High VID Range Programming
The EP5358HUI VOUT settings are optimized
for higher nominal voltages such as those
required to power IO, RF, or IC memory. The
preset voltages range from 1.8V to 3.3V.
There are eight (8) preset output voltage
settings. The EP5358HUI does not have an
external divider option.
As with the
EP5358LUI, the VID pin settings can be
changed while the device is enabled.
Table 2 shows the VS0-VS2 pin logic states for
the EP5358HUI and the associated output
voltage levels.
A logic “1” indicates a
connection to AVIN or to a “high” logic voltage
level. A logic “0” indicates a connection to
AGND or to a “low” logic voltage level. These
pins can be either hardwired to AVIN or AGND
or alternatively can be driven by standard logic
levels. Logic levels are defined in the electrical
characteristics table. Any level between the
logic high and logic low is indeterminate.
These pins must not be left floating.
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03541
The input filter capacitor requirement is a
2.2µF 0603 low ESR MLCC capacitor. The
input capacitor must use a X5R or X7R or
equivalent dielectric formulation.
Y5V or
equivalent
dielectric
formulations
lose
capacitance with frequency, bias, and with
temperature, and are not suitable for switchmode DC-DC converter input filter applications.
Output Filter Capacitor
The output filter capacitor requirement is a
minimum of 10µF 0603 MLCC for VIN<4.3V
and 10uF 0805 for VIN>4.3V.
Ripple
performance can be improved by using 2x10µF
0603 MLCC capacitors (for any allowed VIN).
The maximum output filter capacitance next to
the output pins of the device is 60µF low ESR
MLCC capacitance. VOUT has to be sensed at
the last output filter capacitor next to the
EP5358xUI.
Additional bulk capacitance for decoupling and
bypass can be placed at the load as long as
there is sufficient separation between the VOUT
Sense point and the bulk capacitance.
Excess total capacitance on the output (Output
Filter + Bulk) can cause an over-current
condition at startup. Refer to the section on
Soft-Start for the maximum total capacitance
on the output.
The output capacitor must use a X5R or X7R
or equivalent dielectric formulation. Y5V or
equivalent
dielectric
formulations
lose
capacitance with frequency, bias, and
temperature and are not suitable for switchmode
DC-DC
converter
output
filter
applications.
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EP5358LUI/EP5358HUI
Recommended PCB Footprint
Figure 9: EP5358 Package PCB Footprint
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EP5358LUI/EP5358HUI
Package and Mechanical
Figure 10: EN5358xQI Package Dimensions
Contact Information
Enpirion, Inc.
Perryville III
53 Frontage Road Suite 210
Hampton, NJ 08827
Phone: +1 908-894-6000
Fax: +1 908-894-6090
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. 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.
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