DIODES PAM2401 EV Board User Guide

PAM2401
EVB User Guide
CONFIDENTIAL INFORMATION
PAM2401 EV Board User Guide
AE Department

Revision Information

PAM2401 General 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 150uA during Pulse Skip Mode operation, maximizing battery life in portable applications. Other features include:<1uA shutdown, anti-ringing control, Hiccup mode at short protection, over voltage protection and over temperature protection.
The P AM2401 is available in MSOP-8 and U-DFN3030-12 packages

Key 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
• <1uA Shutdown Current
• Power Good Indicator
• MSOP-8 and U-DFN3030-12 packages

EV Board Schematic

EVB PAM2401 Description

PAM2401 EB33AA and EB33AB are both suitable evaluation board for the PAM2401, a DC/DC converter. The board is targeted to be used in providing a simple and convenient evaluation environment for the PAM2401. Requires parts, power supply connectors etc. on the board, which makes it easy to be evaluated.

EV Board View

Resistor select for output voltage setting

Vout = (1+R1/R2)×Vref ( For EB33AA) (Vref=0.6V)
Vout = (1+R2/R3)×Vref ( For EB33AB)

External Components Selection

Input & output Capacitors (C45, Ca4)

1. For lower output ripple, low ESR is required.
2. Low leakage current needed, XSR/X7R ceramic recommend, multiple capacitor parallel connection.
3. For output lower than 4.2V application, the minimum value of output capacitor should more than 32uF at least.

Output Voltage programmer resistors (R12, R23)

1. For programmer output voltage
2. For accurate output voltage, 1% tolerance is required.

Inductor (L1)

1. Low DCR for good efficiency
2. Inductance saturate current must higher than the output current

Current Limit Set resistor (R34)

1. Rset floating or Rset >200K, Ilimit=3A
2. Rset=100K, Himit=1.5A
3. Rset=66K, Ilimit=1A

Evaluation board BOM list for EB33AA:

Item| Value| Type| Rating| Description| Description
---|---|---|---|---|---
C1,C2,C5| 10uF| X5R/X7R,
Ceramic/0805| 10V| Input coupling CAP| TAIYO YUDEN
EMK212ABJ106KD-T
C3,C4| 22uF| X5R/X7R, Ceramic/0805| 10V| Output coupling
CAP| TAIYO YUDEN
EMK212ABJ106KD-T
L1| 2.2uH| | >3A| Inductor| CDMC6D28NP-2R2M
R1| 825K| 0805| 1%| Voltage set RES*|
R2| 110K| 0805| 1%|
R3| Floating| | | Current Limit Res| Ilimit=3A
IC1| | PAM2401| MSOP-8| |
PCB| | PAM2401
EB33AA| | |

*Note: The present value of R1/R2 are based on Vout=5V

Evaluation board BOM list for EB33AB:

Item| Value| Type| Rating| Description| Description
---|---|---|---|---|---
C1,C2,C5| 10uF| X5R/X7R,
Ceramic/0805| 10V| Input coupling
CAP| TAIYO YUDEN
EMK212ABJ106KD-T
C3,C4| 22uF| X5R/X7R,
Ceramic/0805| 10V| Output coupling
CAP| TAIYO YUDEN
EMK212ABJ106KD-T
L1| 2.2uH| | >3A| Inductor| CDMC6D28NP-2R2M
R1| 0Ω| X5R/X7R,
Ceramic/0805| | |
R2| 825K| 0805| 1%| Voltage set RES*|
R3| 110K| 0805| 1%|
R4| Floating| | | Current Limit Res| Ilimit=3A
IC1| | PAM2401| DFN3030-12| |
PCB| | PAM2401
EB33AB| | |

*Note: The present value of R1/R2 are based on Vout=5V
DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M

Power Analog
Microelectronics, Inc.
Rev. V2.0
April. 2014

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