A Product Line of
Diodes Incorporated
PAM2421/ PAM2422/ PAM2423
3A, 4.5A, 5.5A PWM STEP-UP DC-DC CONVERTER
Description |
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Pin Assignments |
The PAM242x devices are high-performance, fixed frequency, current-mode PWM step-up DC/DC converters that incorporate internal power MOSFETs. The PAM242x includes an integrated power MOSFET that supports peak currents of up to 3A/4.5A/5.5A.
The PAM242x utilizes simple external loop compensation allowing optimization between component size, cost and AC performance across a wide range of applications. Additional functions include an externally programmable soft-start function for easy inrush current control, internal over-voltage protection (OVP), cycle-by-cycle current limit protection, under voltage lock-out and thermal shutdown.
The PAM242x is available in the small SOP-8(EP) package.
Features
Greater than 90% Efficiency
Adjustable Output Voltage Up to 24V
Internal 24V Power MOSFET
Peak Current 3A,4.5A,5.5A
520kHz Frequency
Built-in Over-Voltage Protection (OVP)
Open Protection
Programmable Soft-Start Function
Thermal Shutdowns
Under-Voltage-Lockout
Over-Current Protection
SOP-8(EP) Package
Applications
TFT LCD Monitors
Battery-Powered Equipment
Set-Top Boxes
DSL and Cable Modems and Routers
Typical Applications Circuit
PAM2421/PAM2422/PAM2423 |
1 of 10 |
November 2012 |
Document number: DSxxxxx Rev. 1 - 1 |
www.diodes.com |
© Diodes Incorporated |
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A Product Line of |
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Diodes Incorporated |
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PAM2421/ PAM2422/ PAM2423 |
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Pin Descriptions |
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Pin |
SOP-8(EP) |
Function |
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Number |
Pin Name |
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1 |
PGND |
Power Ground |
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2 |
IN |
Supply Input |
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3 |
EN |
Enable Control. Connect to a logic high level to enable the IC. Connect to a logic low |
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level to disable the IC. When unused, connect EN pin to IN (do not leave pin floating). |
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4 |
COMP |
Error Amplifier Compensation Node |
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5 |
AGND |
Analog Ground |
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6 |
FB |
Feedback Input.Connect this pin a resistor divider from the output to set the output |
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voltage. FB is regulated to 1.262V. |
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7 |
SS |
Soft Start Control Input. Connect a capacitor from this pin to Ground to set soft-start |
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timing duration. SS is discharged to ground in shutdown. SS may be left unconnected if |
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soft start is not desired. |
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8 |
SW |
Switch Output. Connect this pin to the inductor and the schottky diode. To minimize |
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EMI, minimize the PCB trace path between this pin and the input bypass capacitor. |
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— |
Exposed PAD |
Connected to Ground |
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Functional Block Diagram
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PAM2421/PAM2422/PAM2423 |
2 of 10 |
November 2012 |
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Document number: DSxxxxx Rev. 1 - 1 |
www.diodes.com |
© Diodes Incorporated |
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A Product Line of
Diodes Incorporated
PAM2421/ PAM2422/ PAM2423
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground.
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Parameter |
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Rating |
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Unit |
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SW to Ground |
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-0.3 to +28 |
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V |
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VIN, EN, FB, SS, COMP to Ground |
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-0.3 to +6.5 |
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V |
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Continuous SW Current |
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Internally Limited |
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V |
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Operating Temperature Range |
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-40 to +150 |
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°C |
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Storage Temperature Range |
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-55 to +150 |
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°C |
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Lead Temperature (Soldering, 10 sec) |
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300 |
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°C |
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Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) |
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Parameter |
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Rating |
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Unit |
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Junction Temperature Range |
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-40 to +125 |
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°C |
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Ambient Temperature Range |
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-40 to +85 |
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Thermal Information |
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Parameter |
Symbol |
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Package |
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Max |
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Unit |
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Thermal Resistance (Junction to Case) |
θJC |
SOP-8(EP) |
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75 |
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°C/W |
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Thermal Resistance (Junction to Ambient) |
θJA |
SOP-8(EP) |
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180 |
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PAM2421/PAM2422/PAM2423 |
3 of 10 |
November 2012 |
Document number: DSxxxxx Rev. 1 - 1 |
www.diodes.com |
© Diodes Incorporated |
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