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PAM2309 Dataheets PDF



Part Number PAM2309
Manufacturers Diodes
Logo Diodes
Description 1A STEP-DOWN DC-DC CONVERTER
Datasheet PAM2309 DatasheetPAM2309 Datasheet (PDF)

A Product Line of Diodes Incorporated PAM2309 1A STEP-DOWN DC-DC CONVERTER Description The PAM2309 is a step-down current-mode, DC-DC converter. At heavy load, the constant frequency PWM control performs excellent stability and transient response. To ensure the longest battery life in portable applications, the PAM2309 provides a power-saving PulseSkipping Modulation (PSM) mode to reduce quiescent current under light load operation to save power. The PAM2309 supports a range of input voltages f.

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A Product Line of Diodes Incorporated PAM2309 1A STEP-DOWN DC-DC CONVERTER Description The PAM2309 is a step-down current-mode, DC-DC converter. At heavy load, the constant frequency PWM control performs excellent stability and transient response. To ensure the longest battery life in portable applications, the PAM2309 provides a power-saving PulseSkipping Modulation (PSM) mode to reduce quiescent current under light load operation to save power. The PAM2309 supports a range of input voltages from 2.5V to 5.5V, allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH cell, USB, and other standard power sources. The output voltage is adjustable from 0.6V to the input voltage. All versions employ internal power switch and synchronous rectifier to minimize external part count and realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less than 0.1µA. Other key features include under-voltage lockout to prevent deep battery discharge. The PAM2309 is available in TSOT25, DFN2x2-6 Pin and QFN3x3-16 Pin packages. Pin Assignments Top View TSOT25 Features • Efficiency up to 96% • Only 40µA (typ) Quiescent Current • Output Current: Up to 1A • Internal Synchronous Rectifier • 1.5MHz Switching Frequency • Soft-Start • Under-Voltage Lockout • Short Circuit Protection • Thermal Shutdown • 5-pin Small TSOT25, DFN2x2-6 Pin and QFN3x3-16 Pin Packages • Pb-Free Package Applications • Cellular Phone • Portable Electronics • Wireless Devices • Cordless Phone • Computer Peripherals • Battery Powered Widgets • Electronic Scales • Digital Frame PAM2309 Document number: DSxxxxx Rev. 2 - 1 1 of 17 www.diodes.com January 2013 © Diodes Incorporated Typical Applications Circuit A Product Line of Diodes Incorporated PAM2309 VO = 0.5 × ⎜⎜⎛1 + ⎝ R1 ⎟⎞ R2 ⎟ ⎠ Pin Descriptions Pin Name VIN GND EN VOUT/FB SW NC Function Chip main power supply pin. Ground Enable control input. Force this pin voltage above 1.5V, enables the chip, and below 0.3V shuts down the device. VOUT: Output voltage feedback pin, an internal resistive divider divides the output voltage down for comparison to the internal reference voltage. FB: Feedback voltage to internal error amplifier, the threshold voltage is 0.5V. The drains of the internal main and synchronous power MOSFET. Not connected Functional Block Diagram PAM2309 Document number: DSxxxxx Rev. 2 - 1 2 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2309 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. Parameter Input Voltage EN, FB Pin Voltage SW Voltage Junction Temperature Storage Temperature Range Soldering Temperature Rating -0.3 to +6.0 -0.3 to VIN -0.3 to ( VIN +0.3) 150 -65 to +150 300, 5sec Unit V V V °C °C °C Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Parameter Supply Voltage Operation Temperature Range Junction Temperature Range Rating 2.5 to 5.5 -40 to +85 -40 to +125 Unit V °C Thermal Information Parameter Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Package TSOT25 (Note 1) DFN2x2 QFN3x3 TSOT25 DFN2x2 QFN3x3 TSOT25 DFN2x2 QFN3x3 Symbol θJC θJA PD Max 130 20 12 102 68 34 400 980 1470 Unit °C/W mW Note: 1. The maximun output current for TSOT25 package is limited by internal power dissipation capacity as described in Application Information hereinafter. PAM2309 Document number: DSxxxxx Rev. 2 - 1 3 of 17 www.diodes.com January 2013 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2309 Electrical Characteristics (@TA = +25°C, VIN = 3.6V, VO = 1.8V, CIN = 10µF, CO = 10µF, L = 4.7µH, unless otherwise specified.) Parameter Input Voltage Range Regulated Feedback Voltage Reference Voltage Line Regulation Regulated Output Voltage Accuracy Peak Inductor Current Output Voltage Line Regulation Output Voltage Load Regulation Quiescent Current Shutdown Current Oscillator Frequency Drain-Source On-State Resistance SW Leakage Current High Efficiency EN Threshold High EN Threshold Low EN Leakage Current Over Temperature Protection OTP Hysteresis Symbol VIN VFB ΔVFB VO IPK LNR LDR IQ ISD fOSC RDS(ON) ILSW η VEH VEL IEN OTP OTH Test Conditions IO = 100mA VIN = 3V,VFB = 0.5V or VO = 90% VIN = 2.5V to 5V, IO = 10mA IO = 1mA to 800mA No load VEN = 0V VO = 100% VFB = 0V or VO = 0V IDS = 100mA P MOSFET N MOSFET Min 2.5 0.490 -3 1.2 1.5 Typ 0.500 0.3 1.5 0.2 0.5 40 0.1 1.5 500 0.30 0.35 ±0.01 96 ±0.01 150 30 Max 5.5 0.510 +3 0.5 1.5 70 1.0 1.8 0.45 0.50 1 0.3 Units V V %/V % A %/V % µA µA MHz kHz Ω Ω µA % V V µA °C °C PAM2309 Document number: DSxxxxx Rev. 2 - 1 4 of 17 www.diodes.com January 2013 © Diodes Incorpo.


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