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PDF PAM2401 Data sheet ( Hoja de datos )
| Número de pieza | PAM2401 | |
| Descripción | 1.0MHz STEP-UP DC-DC CONVERTER | |
| Fabricantes | Diodes | |
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A Product Line of
Diodes Incorporated
PAM2401
1.0MHz STEP-UP DC-DC CONVERTER
Description
The PAM2401 is a high efficiency, current mode, fixed frequency,
step-up DC/DC converter with true output disconnect and inrush
current limiting. The device includes one 0.10Ω N-channel MOSFET
switch and one 0.15Ω P-channel synchronous rectifier. This product
has the ability to simply program the output voltage from 2.5V to
5.0V.The switching frequency is 1.0MHz, programmable current limit
set by an external resistor from 1.0A to 3.0A with internal soft-start.
When loading became light, the converter will automatically enter into
PSM to improve the efficiency.
Quiescent current is only 150µA during Pulse Skip Mode operation,
maximizing battery life in portable applications. Other features include
: <1µA shutdown, anti-ringing control, Hiccup mode at short
protection, over voltage protection and over temperature protection.
The PAM2401 is available in MSOP-8 and U-DFN3030-12 packages
Pin Assignments
Features
• Up to 95% Efficiency
• True Output Disconnect
• Inrush Current Limiting When Power On
• Output Current up to 1000mA at VIN = 3V and VOUT = 5.0V
• Fixed Frequency Operation Up to 1MHz
• 0.9V to 4.75V Input Range
• 2.5V to 5.0V Adjustable Output Voltage
• Guaranteed 1.0V Start-Up
• Programmable Current Limit
• Internal Soft-Start
• Internal Compensation
• Pulse Sipping Mode at Light Load Operation
• Hiccup Mode Short Protection
• Over Voltage Protection
• Over Temperature Protection
• <1µA Shutdown Current
• Power Good Indicator
• MSOP-8 and U-DFN3030-12 packages
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
Applications
• Handheld Computers
• Cordless Phones
• GPS Receivers
• Battery Backup Supplies
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
PAM2401
Document number: DS37285 Rev. 1 - 2
1 of 10
www.diodes.com
May 2014
© Diodes Incorporated
1 page  
A Product Line of
Diodes Incorporated
PAM2401
Application Information
Output Voltage Set Equation
The output voltage of the PAM2401, VOUT, is set by an external resistor divider from VOUT to ground as shown in figure 1. The divider tap is
connected to the FB pin and the typical value of the voltage at the FB pin is 0.6V. The following equation is used to set the
VOUT: VOUT = 0.6 (1+R1/R2) For example, if output voltage of 5V is needed, with a chosen R2 value of 100kΩ ,the value of R1 can be calculated
according to the equation, so a 750kΩ resistor should be chosen for R1.
Inductor Selection
To select an inductor for use in PAM2401 applications, it is worth noting that the inductor current saturation rating should be larger than the
possible peak inductor current to ensure proper operation, and should have low DCR (DC resistance). Using an inductor the saturation current of
which is lower than required can cause a dramatic drop in the inductance and can decay the maximum output current levels severely. For most
applications, the value of the inductor should be in the range ofs 1µH to 4.7µH. Its value is chosen based on the desired ripple current.
Larger value inductors result in lower ripple currents, and smaller value inductors result in higher ripple currents. A 1.5µH or 2.2µH inductor will be
the best choice for most PAM2401 applications. The following equation can also help give a good approximate value for the inductor.
L = V INxD
ΔILxf
D Duty Cycle=1-VIN/VOUT, F Switching Frequency = 1.0MHz, ∆IL Ripple Current in the Inductor, i.e., 20% to 40% of the maximum inductor current
(Ip).
Output and Input Capacitor Selection
Input Capacitor
At least a 10µF input capacitor is recommended to reduce the input ripple and switching noise for normal operating conditions, while a 10-22µF
capacitor may be required for higher power and dynamic loads. Larger values and lower ESR (Equivalent Series Resistance) may be needed if
the application require very low input ripple. It follows that ceramic capacitors are a good choice for applications. Note that the input capacitor
should be located as close as possible to the IC.
Output Capacitor
A minimum output capacitor value of 22µF is recommended and may be increase to a larger value. The ESR of the output capacitor is important
because it determines the peak to peak output voltage ripple by the following equation:
ΔV OUT >> 2ΔIL xRESR
Multilayer ceramic capacitors are an excellent choice as they have extremely low ESR and are available in small footprints.
PAM2401
Document number: DS37285 Rev. 1 - 2
5 of 10
www.diodes.com
May 2014
© Diodes Incorporated
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet PAM2401.PDF ] | |
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