Diodes Incorporated Know How Guide: PAM2401 1.0MHz Step-Up DC-DC Converter
June 2014
Features and Benefits
| Features | Benefits |
|---|---|
| True Output Disconnect | To avoid leakage power on output |
| Programmable Over Current Protection | To prevent the damage from the high current |
| Power Good Indicator | Support system power sequence |
| Pulse Sipping Mode at Light Load Operation | Increasing efficiency at light load |
| Fixed Frequency Operation Up to 1MHz | Reduce external components sizes |
| Integrated OVP/OTP | To make sure a stable output voltage, Vo is over 5.7V or once junction temperature exceeds 160°C (Typ.), PAM2401 will turn-off output. |
Functional Description
The PAM2401 is a high efficiency, current mode, fixed frequency, step-up DC-DC converter with true output disconnect and in-rush current limiting. The device includes one 0.1Ω 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 5V. The switching frequency is 1.0MHz, programmable current limit set by an external resistor from 1.0A to 3.0A with internal soft-start.
The PAM2401 automatically enters into PSM to improve the efficiency which maximizes battery life in portable applications. 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.
Application Information
Typical Application Circuit
The typical application circuit shows the PAM2401 configured as a step-up converter. Key components include:
- Input voltage (VIN) range: 2.4V to VOUT - 0.25V.
- An external resistor (Rset) connected to the RSET pin to set the programmable current limit (1.0A to 3.0A).
- An input capacitor (CIN) of 10μF.
- An inductor (L1) of 2.2μH.
- The PAM2401 IC, with pins for VIN, LX (switch node), OUT (output), FB (feedback), PG (power good), EN (enable), AGND (analog ground), RSET (current limit set), and PGND (power ground).
- An output voltage (Vout) of 5V is shown.
- Feedback resistors (RFB1 and RFB2) are used to set the output voltage.
- An output capacitor (COUT) of 22μF.
- The EN pin controls the ON/OFF state of the device.
Opportunity Qualification
- Step up converter requirement.
- Low Voltage input and Vout under 5.5V.
- High current application and care board space.
Pricing and Ordering Information
The PAM2401 is available in different packages and configurations. The part number structure is PAM2401 X X XXX, where:
- Package Type: S denotes MSOP-8, Y denotes U-DFN3030-12.
- Number of Pins: C denotes 8 pins, P denotes 12 pins.
- Output Voltage: ADJ denotes adjustable output voltage.
| Device | Package | Price @ 5k | Reel size | Quantity |
|---|---|---|---|---|
| PAM2401SCADJ | MSOP-8 | $0.30 | 13" | 2,500 |
| PAM2401YPADJ | U-DFN3030-12 | $0.33 | 13" | 3,000 |
Support
Detailed datasheets are located on the Diodes Incorporated website.
Samples are available through Samples@diodes.com.
