PDF AX3604 Data sheet ( Hoja de datos )

Número de pieza	AX3604
Descripción	Dual High-Efficiency PWM Step-Down DC-DC Converter
Fabricantes	AXElite
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No Preview Available ! AX3604 Dual High-Efficiency PWM Step-Down DC-DC Converter  GENERAL DESCRIPTION The AX3604 is a dual high-efficiency Pulse-Width-Modulated (PWM) step-down DC-DC converter. It is capable of delivering 1A output current over a wide input voltage range from 2.5V to 5.5V, the AX3604 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources within the range such as cellular phones, PDAs and other handheld devices. Two operational modes are available: PWM/Low-Dropout auto-switch and shutdown modes. Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application. The AX3604 enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper PMOS. The AX3604 enter shutdown mode and consumes less than 0.1μA when EN pin is pulled low. The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operation frequency of 1.5MHz. This along with small TDFN-12L (3x3) package provides small PCB area application. Other features include soft start, lower internal reference voltage with 2% accuracy, over temperature protection, and over current protection.  FEATURES - 2.5V to 5.5V Input Voltage Range - Adjustable Output Voltage from 0.6V to VIN - 1A Output Current/per channel - High Efficiency : up to 95% - No Schottky Diode Required - 1.5MHz Fixed-Frequency PWM Operation - Small 12-Lead TDFN Package 1/15 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.1 Mar.22, 2013 1 page AX3604  ELECTRICAL CHARACTERISTICS (VIN = 3.6V, VOUT = 2.5V, VREF = 0.6V, L = 2.2uH, CIN = 4.7μF, COUT = 10μF, TA = 25°C, IMAX= 1A unless otherwise specified) Characteristics Symbol Conditions Min Typ Max Units Channel 1 and Channel 2 Input Voltage Range Under Voltage Lock Out threshold Quiescent Current VIN UVLO IQ IOUT=0mA, VFB = VREF + 5% 2.5 - 5.5 -2 - - 250 350 V V μA Shutdown Current ISHDN EN=GND - 0.1 1 μA Reference Voltage VREF For Adjustable Output Voltage 0.588 0.6 0.612 Adjustable Output Voltage Range VOUT (Note 1) VREF VIN −ΔV ΔVOUT VIN = 2.5V to 5.5V, VOUT = 1.2V, 0A < IOUT < 1A -3 - +3 ΔVOUT VIN = 2.5V to 5.5V, VOUT = 1.3V, 0A < IOUT < 1A -3 - 3 Output Voltage Accuracy Fix ΔVOUT VIN = 2.5V to 5.5V, VOUT = 1.8V, 0A < IOUT < 1A VIN = VOUT + ΔV to 5.5V ΔVOUT (Note 2) -3 - -3 - 3 3 VOUT = 2.5V, 0A < IOUT < 1A VIN = VOUT + ΔV to 5.5V ΔVOUT (Note 2) -3 - 3 VOUT = 3.3V, 0A < IOUT < 1A Output Voltage Accuracy VIN = VOUT + ΔV to 5.5V Adjustable ΔVOUT (Note 2) 0A < IOUT < 1A -3 - 3 FB Input Current IFB VFB = VIN -50 - 50 V V % % % % % % nA RDS(ON) of P-MOSFET RDS(ON)_P IOUT= 200mA VIN = 2.5V VIN = 3.6V - 0.38 - - 0.28 - Ω Ω RDS(ON) of N-MOSFET RDS(ON)_N IOUT= 200mA VIN = 2.5V VIN = 3.6V - 0.35 - - 0.25 - Ω Ω 5/15 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.1 Mar.22, 2013 5 Page  TYPICAL CHARACTERISTICS AX3604 11/15 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.1 Mar.22, 2013 11 Page

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