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PDF EUP2412-33JIR1 Data sheet ( Hoja de datos )
| Número de pieza | EUP2412-33JIR1 | |
| Descripción | 500kHz Synchronous Step-Up Converter | |
| Fabricantes | Eutech Microelectronics | |
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EUP2412
500kHz Synchronous Step-Up
Converter with 600mA LDO
DESCRIPTION
The EUP2412 provides a high efficiency 500kHz
synchronous step-up converter and a low noise, high
PSRR, low dropout (LDO) fixed output linear regulator
with independent enable pins. EUP2412 input voltage
range is 2.2V to 5.5V, making it ideal for applications
with either a 2-cell NiMH/NiCd or a single-cell
lithium-ion/polymer batteries.
The EUP2412 500kHz fixed frequency synchronous
step-up converter uses smaller external components
producing a compact solution for a wide range of load
currents. Integrated N-Channel main switch and
P-Channel synchronous rectifier greatly improve
converter efficiency. Internal soft-start function reduces
inrush current. The EUP2412 synchronous step-up
convert regulates the output voltage up to 6V. When the
synchronous step-up convert is disabled, the internal
conduction path from SW to OUT is fully blocked. This
output disconnect feature isolates the output from the
input and reduces the shutdown current less than 0.1µA.
The EUP2412 LDO linear regulator has an independent
input supply pin and is capable of delivering up to 600mA
load current. It offers high output accuracy, extremely low
dropout voltage, low quiescent current and fast start-up
time. LDO is designed to work with low-ESR ceramic
capacitors. Only a 2.2uF ceramic output capacitor can
make the device stable over the entire load range.
Optionally connecting a capacitor from BYPASS pin to
GND gets high PSRR. The EUP2412 LDO output voltage
is factory pre-set 1.2V, 1.8V, 2.5V, 2.8V or 3.3V.
The EUP2412 is available in a 10pin 3mm × 3mm
TDFN-10 package.
Typical Application Circuit
FEATURES
z Wide Input Voltage Range: 2.2V to 5.5V
z Synchronous Step-Up Converter:
- 1.6Amp Peak Current Limit
- 500kHz Fixed Switching Frequency
- Output is Disconnected from the Input in
Shutdown
- Built-in Main Switch and Synchronous Rectifier
- Internal Soft-Start
z Linear Regulator:
- 600mA Output Current
- 300mV Dropout Voltage at 600mA
- 2% Initial Accuracy
- Fast Line / Load Transient Response
- 70dB PSRR at 1kHz
- Stable with a 2.2uF Ceramic Output Capacitor
- Output is Discharged to GND in Shutdown
- Fixed Output Voltage: 1.2V to 3.6V
z Thermal Shutdown
z RoHS Compliant and 100% Lead (Fb)-Free
z Available in TDFN33-10 Package
APPLICATIONS
z Portable Media Players
z Cellular Phones
z Bluetooth portable radios and Accessories
z Battery-Powered Equipments
DS2412 Ver1.1 Apr. 2009
Figure 1. Application Circuit 1
1
1 page  
EUP2412Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Absolute Maximum Ratings (1)
OUT, EN, FB to GND ---------------------------------------------------------------------- -0.3V to 6V
INLDO, ENLDO to GND ------------------------------------------------------------------ -0.3V to 6V
VLDO to GND ------------------------------------------------------------------- -0.3V to (VINLDO+0.3V)
SW Current (2) ----------------------------------------------------------------------------- -1.6A to +1.6A
Junction Temperature -------------------------------------------------------------------------
150
Storage Temperature Range ------------------------------------------------------------- -65 to +150
Lead Temperature -----------------------------------------------------------------------------
Thermal Resistance θJA (TDFN-10) --------------------------------------------------------
260
48/W
ESD Rating
Human Body Model -------------------------------------------------------------------
2kV
Recommended Operating Conditions (3)
VIN --------------------------------------------------------------------------------------------- 2.2 to 5.5V
VEN ,VENLDO ---------------------------------------------------------------------------------- 0 to 5.5V
Operating Temperature Range --------------------------------------------------------- -40 to +85
Note (1): Stress beyond those listed under “Absolute Maximum Ratings” may damage the device.
Note (2): SW has internal clamp diodes between GND-SW and SW-OUT. Applications that forward bias these diodes
should take care not to exceed the IC's package power dissipation limits.
Note (3): The device is not guaranteed to function outside the recommended operating conditions.
Electrical Characteristics
TA=+25 , VIN= VEN=2.4V, VINLDO=VENLDO=4.3V, unless otherwise specified.
Parameter
Conditions
EUP2412
Min. Typ. Max.
LDO Linear Regulator
Input Voltage INLDO
POR Threshold
2.5 5.5
2.1
POR hysteresis
0.4
Quiescent Current
Shutdown Current
Power Supply Ripple
Rejection
ILOAD=0mA
VENLDO=0V
VIN=3.3V+1VP-P,f=1kHz,ILOAD=10mA
VIN=3.3V+1VP-P,f=10kHz,ILOAD=10mA
120 180
0.1 1
70
70
ENLDO Logic High Voltage
TA=-40 to +85
1.5
ENLDO Logic Lo Voltage
ENLDO Input Current
Start-up Time
VLDO Output Voltage Accuracy
Output Line Regulation
Output Load Regulation
Dropout Voltage (4)
Maximum Output Current
TA=-40 to +85
VIN=5V, VEN=5V or 0V
CBYPASS=10nF
IOUT=10mA
IOUT=10mA, TA=-40 to +85
3.8V<VINLDO<5.5V, IOUT=10mA
1 mA <IOUT<600mA
ILOAD =300mA
ILOAD =600mA
0.4
-1 1
120
-2 +2
-3 +3
0.04 0.1
17 30
180 240
360 450
600
Short Circuit Current Limit
600 900
Unit
V
V
V
µA
µA
dB
V
V
µA
µs
%
%
%/V
mV
mV
mA
mA
DS2412 Ver1.1 Apr. 2009
5
5 Page 
EUP2412Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Application Information (See Figure 1 and 2)
LDO Input Capacitor C3
A 2.2uF capacitor is required between the INLDO pin and
the GND pin. Place it as close as possible to the device.
There are no requirements for the ESR on the input
capacitor, but the tolerance and temperature coefficient
must be considered when selecting the capacitor to ensure
the capacitance will be 2.2uF over the whole operating
temperature range.
LDO Output Capacitor C4
The EUP2412 LDO is designed specifically to work with
very small ceramic output capacitors. A 2.2uF to 10uF with
5mΩ to 500mΩ ESR range is suitable in the EUP2412 LDO
application circuit. The ESR of a typical 2.2uF ceramic
capacitor is about 20mΩ, which easily meets the ESR
requirement for stability. The EUP2412 LDO will remains
stable and in regulation with no external load. This is special
important in CMOS RAM keep-alive applications.
Step-up Converter Input Capacitor C1
An input capacitor is required to supply the AC ripple
current to the inductor, while limiting noise at the input
source. Multi-layer ceramic capacitors are the best choice
as they have extremely low ESR and are available in small
footprints. Use an input capacitor value of 4.7µF or greater.
This capacitor must be placed physically close to the
device.
Step-up Converter Output Capacitor C2
A single 4.7µF to 10µF ceramic capacitor usually provides
sufficient output capacitance for most applications. Larger
values up to 22µF may be used to obtain extremely low
output voltage ripple and improve transient response. The
impedance of the ceramic capacitor at the switching
frequency is dominated by the capacitance, and so the
output voltage ripple is mostly independent of the ESR. The
output voltage ripple VRIPPLE is calculated as:
( )VRIPPLE
=
ILOAD VOUT − VIN
VOUT × C2 × fSW
Where VIN is the input voltage, ILOAD is the load current, C2
is the capacitance of the output capacitor and fSW is the
500KHz switching frequency.
Capacitor Characteristics
More consideration should be taken when selecting the
capacitor because its capacitance can vary with temperature.
The capacitor type X7R or X5R, which operates over a
temperature range of -40 to +85 , will only vary within
±15%. Some large value ceramic capacitors are
manufactured with Z5U or T5V temperature characteristics.
Their capacitance can drop by more than 50% as the
temperature goes from 25 to 85 . Therefore the
capacitor type X7R or X5R is recommended in applications
where the ambient temperature will change significantly
above or below 25.
Step-up Converter Inductor L1
The inductor is required to force the output voltage higher
while being driven by the lower input voltage. A good rule
for determining the inductance is to allow the peak-to-peak
ripple current to be approximately 30%-50% of the
maximum input current. Make sure that the peak inductor
current is below the minimum current limit at the duty cycle
used (to prevent loss of regulation due to the current limit
variations).
Calculate the required inductance value L using the
equations:
( )L = V IN × VOUT − VIN
VOUT × f sw × ∆I
I IN (MAX )
=
V × IOUT LOAD (MAX )
VIN × η
∆I = (30% − 50%)I IN(MAX )
Where ILOAD(MAX) is the maximum load current, ∆I is the
peak-to-peak inductor ripple current and is efficiency.
For the EUP2412, typically, 4.7µH is recommended for
most applications. Choose an inductor that does not saturate
at the peak switch current as calculated above with
additional margin to cover heavy load transients and
extreme startup conditions.
Setting the Step-up Converter Output Voltage
Set the step-up regulator output voltage by selecting the
resistive voltage divider ratio. The voltage divider drops the
output voltage to the 1.25V feedback voltage. Use a 100kΩ
resistor for R2 of the voltage divider. Determine the
high-side resistor R1 by the equation:
R1 = VOUT − VFB
VFB
R2
Where VOUT is the output voltage, VFB is the 1.25V
feedback voltage and R2=100kΩ.
DS2412 Ver1.1 Apr. 2009
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet EUP2412-33JIR1.PDF ] | |
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