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PDF PJ3406 Data sheet ( Hoja de datos )
| Número de pieza | PJ3406 | |
| Descripción | 1A Synchronous Step-Down Converter | |
| Fabricantes | ETC | |
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PJ3406
1.5MHz, 1A Synchronous Step-Down Converter
FEATURES
High Efficiency: Up to 96%
1.5MHz Constant Frequency Operation
1A Output Current
No Schottky Diode Required
2.0V to 5.5V Input Voltage Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Low Quiescent Current: 20µA
Slope Compensated Current Mode
Control for Excellent Line and Load
Transient Response
Short Circuit Protection
Thermal Fault Protection
Inrush Current Limit and Soft Start
<1µA Shutdown Current
Tiny SOT23-5 Package
APPLICATIONS
Cellular and Smart Phones
Wireless and DSL Modems
PDAs
Digital Still and Video Cameras
MP3 Players
GENERAL DESCRIPTION
The PJ3406 is a constant frequency,
current mode PWM step-down converter.
The device integrates a main switch and a
synchronous rectifier for high efficiency
without an external Schottky diode. It is
ideal for powering portable equipment that
runs from a single cell Lithium-Ion (Li+)
battery. The output voltage can be regulated
as low as 0.6V. The PJ3406 can also run at
100% duty cycle for low dropout operation,
extending battery life in portable system.
This device offers two operation modes,
PWM control and PFM Mode switching
control, which allows a high efficiency over
the wider range of the load.
The PJ3406 is offered in a low profile(1mm)
5-pin, thin SOT package, and is available in
an adjustable version and fixed output
voltage of 1.2V,1.5V, 1.8V,2.5V and 3.3V.
TYPICAL APPLICATION
Figure 1. Basic Application Circuit
Page 1
1 page  
PJ3406
L VOUT VIN VOUT
VIN I L fOSC
Where I L is inductor Ripple Current. Large value inductors result in lower ripple current and
small value inductors result in high ripple current. For optimum voltage-positioning load transients,
choose an inductor with DC series resistance in the 50mΩ to 150mΩ range.
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching noise from the
device.
The input capacitor impedance at the switching frequency should be less than input source
impedance to prevent high frequency switching current passing to the input.
A low ESR input capacitor sized for maximum RMS current must be used. Ceramic capacitors
with X5R or X7R dielectrics are highly recommended because of their low ESR and small
temperature coefficients.
A 4.7µF ceramic capacitor for most applications is sufficient. A large value may be used for
improved input voltage filtering.
Output Capacitor Selection
The output capacitor is required to keep the output voltage ripple small and to ensure regulation
loop stability. The output capacitor must have low impedance at the switching frequency. Ceramic
capacitors with X5R or X7R dielectrics are recommended due to their low ESR and high ripple
current ratings. The output ripple VOUT is determined by:
VOUT
VOUT (VIN
VIN f OSC
VOUT
L
)
ESR
8
f
1
osc
C3
A
10µF ceramic can satisfy most applications.
PC Board Layout Checklist
When laying out the printed circuit board, the following checking should be used to ensure proper
operation of the PJ3406 .Chec k the following in your layout:
1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept
short, direct and wide.
2. Does the (+) plates of Cin connect to Vin as closely as possible. This capacitor provides the AC
current to the internal power MOSFETs.
3. Keep the switching node, SW, away from the sensitive VOUT node.
4. Keep the (-) plates of Cin and Cout as close as possible
Page 5
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet PJ3406.PDF ] | |
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