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PDF EUP3426 Data sheet ( Hoja de datos )
| Número de pieza | EUP3426 | |
| Descripción | Synchronous Step-Down Converter | |
| Fabricantes | Eutech Microelectronics | |
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EUP3426
3A, Synchronous Step-Down Converter
DESCRIPTION
The EUP3426 is a 1 MHz fixed frequency synchronous,
current-mode, step-down dc-dc converter capable of
providing up to 3A output current. The EUP3426
operates from an input range of 2.7V to 5.5V and
provides a regulated output voltage from 0.6V to 5V.
The internal synchronous power switch improves
efficiency and eliminates the need for an external
Schottky diode. The EUP3426 can be externally set for
either forced PWM continuous mode or pulse skipping
mode. Forced PWM operation provides very low output
ripple voltage for noise sensitive applications while
pulse skipping operation improves light load efficiency
by reducing switching loss.
The EUP3426 features short circuit and thermal
protection circuits to improve system reliability.
Internally soft-start avoids input inrush current during
startup. The EUP3426 is available in TDFN
3mm × 3mm 10-pin package with the exposed pad and
SOP-8 package with the exposed pad.
FEATURES
2.7V to 5.5V Input Voltage Range
High Efficiency up to 96%
3A Available Load Current
57/35mΩ Integrated PFET/NFET Switches
1MHz Switching Frequency
100% Duty Cycle Low Dropout Operation
Short Circuit and Thermal Protection
Integrated UVLO and Power Good
Excellent Line and Load Transient Response
Available in 10-Pin 3mm × 3mm TDFN and
SOP-8 (EP) Packages
RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
High Performance DSPs, FPGAs, ASICs and
Microprocessors
Base Station, Telecom, and Networking
Equipment Power Supplies
ePC and NetPCs
Typical Application Circuit
Figure1. TDFN-10 Typical Application Circuit
DS3426 Ver1.0 Jan. 2011
1
1 page  
EUP3426
Electrical Characteristics (continued)
PVIN=SVIN=VEN=5V, TA=+25°C,unless otherwise specified. The ● indicates specifications which apply over the full
operatimg range -40°C to +85°C. The EUP3426 is 100% production tested at 25°C. Typical and temperature
specifications are guaranteed by design and statistical characterizations.
Symbol
Parameter
Conditions
TON(Min)
IPEAK
INEG
IZX
ILX
RPFET
RNFET
TSD
Minimum On Time
Hside PCH Switch Peak Current VFB=0.55V
Lside NCH Negative Current Limit VSKIP =0V, PWM Mode
Lside NCH Reverse Current Limit
VSKIP = 5V, Pulse Skipping
Mode
LX Leakage Current
VEN=0V, VLX=0 or 5V
RDS(ON) of P-Channel FET
ILX=0.5A
RDS(ON) of N-Channel FET
ILX=0.5A
Thermal Shutdown
EUP3426
Min. Typ. Max.
100
5
-1
Unit
ns
A
A
0.2 A
-5 5 µA
57 70 mΩ
35 50 mΩ
160 °C
DS3426 Ver1.0 Jan. 2011
5
5 Page 
The external resistive divider is connected to the output,
allowing remote voltage sensing as shown below.
EUP3426
Thermal Considerations
To avoid the EUP3426 from exceeding the maximum
junction temperature, the user will need to do a thermal
analysis. The goal of the thermal analysis is to determine
whether the operating conditions exceed the maximum
junction temperature of the part. The temperature rise is
given by:
TR=(PD)(θJA)
Where PD=ILOAD2 × RDS(ON) is the power dissipated by
the regulator ; θJA is the thermal resistance from the
junction of the die to the ambient temperature.
The junction temperature, TJ, is given by:
TJ=TA+TR
Where TA is the ambient temperature.
TJ should be below the maximum junction temperature
of 125°C.
PC Board Layout Checklist
For all switching power supplies, the layout is an
important step in the design especially at high peak
currents and switching frequencies. If the layout is not
carefully done, the regulator might show stability
problems as well as EMI problems.
When laying out the printed circuit board, the following
guidelines should be used to ensure proper operation of
the EUP3426.
1. The input capacitor CIN should connect to VIN as
closely as possible. This capacitor provides the AC
current to the internal power MOSFETs.
2. The power traces, consisting of the GND trace, the
LX trace and the VIN trace should be kept short,
direct and wide.
3. The FB pin should connect directly to the feedback
resistors. The resistive divider RFB1/RFB2 must be
connected between the COUT and ground.
4. Keep the switching node, LX, away from the
sensitive FB node.
DS3426 Ver1.0 Jan. 2011
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet EUP3426.PDF ] | |
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