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PDF EP53A8HQI Data sheet ( Hoja de datos )
| Número de pieza | EP53A8HQI | |
| Descripción | 1000mA Synchronous Buck Regulator | |
| Fabricantes | Enpirion | |
| Logotipo |  |
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EP53A8LQI/EP53A8HQI
1000mA Synchronous Buck Regulator
with Integrated Inductor
RoHS Compliant; Halogen Free
Description
The EP53A8LQI and EP53A8HQI are a 1000mA
PowerSOC. The device integrates MOSFET
switches, control, compensation, and the
Inductor in an advanced 3mm x 3mm QFN
Package.
Integrated inductor ensures the complete power
solution is fully characterized with the inductor
carefully matched to the silicon and
compensation network. . It 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 21mm2.
The EP53A8xQI 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.
The VID pins can be changed on the fly for fast
dynamic voltage scaling. EP53A8LQI further has
the option to use an external voltage divider.
3.5mm
4.7uF
100 Ohm
6mm
EP53A8xQI
Features
• Integrated Inductor Technology
• 3mm x 3mm x 1.1mm QFN package
• Total Solution Footprint ~ 21mm2
• Low VOUT ripple for RF compatibility
• High efficiency, up to 94%
• 1000mA continuous output current
• Less than 1µA standby current
• 5 MHz switching frequency
• 3 pin VID for glitch free voltage scaling
• VOUT Range 0.6V to VIN – 0.5V
• Short circuit and over current protection
• UVLO and thermal protection
• IC level reliability in a PowerSOC solution
Application
• Portable wireless and RF applications
• Wireless broad band data cards
• Solid state storage applications
• Noise and space sensitive applications
100 ohm
VIN
4.7µF
0603
PVIN
VOUT
AVIN
VSENSE
ENABLE
VFB
VS0
VS1
VS2 PGND AGND
VOUT
10µF
0805
10uF
Figure 1: Total Solution Footprint.
www.Dat0a3S6h5e1et.in
Figure 2: Typical Application Circuit.
12/16/2009
www.enpirion.com
Rev:B
1 page  
EP53A8LQI/EP53A8HQI
Typical Performance Characteristics
95
85
75
65
55
45
35
25
0
100 200 300 400 500 600 700 800 900 1000
Load Current (A)
Efficiency vs. Load Current: VIN = 5.0V, VOUT (from
top to bottom) = 3.7, 3.3, 2.5, 1.8, 1.2V
95
85
75
65
55
45
35
25
0
100 200 300 400 500 600 700 800 900 1000
Load Current (A)
Efficiency vs. Load Current: VIN = 3.3V, VOUT (from
top to bottom) = 2.5, 1.8V,1.2V
Start Up Waveform: VIN = 5.0V, VOUT = 3.3V; ILOAD =
1000mA
Shut-down Waveform: VIN = 5.0V, VOUT = 3.3V; ILOAD =
1000mA
©Enpirion 2009 all rights reserved, E&OE
www.Dat0a3S6h5e1et.in
5
12/16/2009
www.enpirion.com
Rev:B
5 Page 
Output Voltage Programming
The EP53A8xQI 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 an
external control signal, 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
EP53A8LQI.
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 EP53A8HQI.
Internally, the output of the VID multiplexer
sets the value for the voltage reference DAC,
which in turn is connected to the non-inverting
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.
NOTE: The VID pins must not be left floating.
Table 1: EP53A8LQI VID Voltage Select Settings
VS2 VS1 VS0 VOUT
0 0 0 1.50
0 0 1 1.45
0 1 0 1.20
0 1 1 1.15
1 0 0 1.10
1 0 1 1.05
1 1 0 0.8
1 1 1 EXT
EP53A8L Low VID Range Programming
The EP53A8LQI 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
EP53A8LQI/EP53A8HQI
voltage divider option. The VID pin settings
can be changed on the fly to implement glitch-
free voltage scaling.
Table 1 shows the VS2-VS0 pin logic states for
the EP53A8LQI 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.
EP53A8LQI External Voltage Divider
The external divider option is chosen by
connecting VID pins VS2-VS0 to VIN or a logic
“1” or “high”. The EP53A8LQI 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:
( )VOUT
= 0.6V
1+
Ra
Rb
100 Ohms
VIN
4.7uF
0603
PVIN
AVIN
VSense
VOUT
ENABLE
VS0
VS1
VS2 PGND
AGND
VFB
Ra
Rb
VOUT
10µF
0805
Figure 8: EP53A8LQI using external divider
Ra must be chosen as 237KΩ to maintain loop
gain. Then Rb is given as:
R = 142.2x103 Ω
b VOUT − 0.6
VOUT can be programmed over the range of
0.6V to (VIN – 0.5V).
NOTE: Dynamic Voltage Scaling is not allowed
between internal preset voltages and external
divider.
©Enpirion 2009 all rights reserved, E&OE
www.Dat0a3S6h5e1et.in
11
12/16/2009
www.enpirion.com
Rev:B
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet EP53A8HQI.PDF ] | |
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