M3406

PIN DESCRIPTION
Pin Name EN GND SW VIN FB Pin Number 1 2 3 4 5 Description Chip Enable Pin. Drive EN above 1.5V to turn on the part. Drive EN below 0.3V to turn it off. Do not leave EN floating. Analog ground pin. Power Switch Output. It is the switch node connection to Inductor. This pin connects to the drains of the internal P-ch and N-ch MOSFET switches. Power Supply Input.Must be closely decoupled to GND with a 4.7µF or greater ceramic capacitor. Output Voltage Feedback Pin. An internal resistive divider divides the output voltage down for comparison to the internal reference voltage.
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AEROSEMI
M3406 800mA ,1.5MHz Synchronous Step-Down Converter
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage………………-0.3V to 6.5V EN,FB Voltages…………….-0.3V to (V IN +0.3V) SW Voltage………………...-0.3V to (V IN +0.3V) Power Dissipation………………………...0.4W Thermal Resistance θ JC ………………..130°C/W Thermal Resistance θ JA ………………..250°C/W Junction Temperature(Note2)…………….150°C Operating Temperature Range…….-40°C to 85°C Lead Temperature(Soldering,10s)………...300°C Storage Temperature Range……..-65°C to 150°C ESD HBM(Human Body Mode)……………...2kV ESD MM(Machine Mode)………………….200V
M3406 Rev1.0
Aerosemi Proprietary Information.Unauthorized Photocopy and Duplication Prohibited. All Rights Reserved.
3
AEROSEMI
M3406 800mA ,1.5MHz Synchronous Step-Down Converter
140 20 0.1 0.600 0.600 0.600 0.04 0.04 0.5 1.5 300 300 300 1.5
450 450
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: T J is calculated from the ambient temperature T A and power dissipation P D according to the following formula: T J = T A + (P D ) x (250°C/W). Note 3: 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization. Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency.
TYPICAL PERFORMANCE CHARACTERISTICS
M3406
FEATURES

High Efficiency: Up to 96% 1.5MHz Constant Frequency Operation 800mA Output Current No Schottky Diode Required 2V to 6V Input Voltage Range Output Voltage as Low as 0.6V PFM Mode for High Efficiency in Light Load 100% Duty Cycle in Dropout Operation Low Quiescent Current: 20μA Slope Compensated Current Mode Control for Excellent Line and Load Transient Response Short Circuit Protection Thermal Fault Protection Inrush Current Limit and Soft Start <1μA Shutdown Current SOT23-5 package
M3406 Rev1.0
Aerosemi Proprietary Information.Unauthorized Photocopy and Duplication Prohibited. All Rights Reserved.
2
AEROSEMI
M3406 800mA ,1.5MHz Synchronous Step-Down Converter
CASC

AEROSEMI
800mA,2V-6V Input,1.5MHz Synchronous Step-Down Converter GENERAL DESCRIPTION
The M3406 is a constant frequency, current mode step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. It is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. The output voltage can be regulated as low as 0.6V. The M3406 can also run at 100% duty cycle for low dropout operation, extending battery life in portable system. This device offers two operation modes, PWM control and PFM Mode switching control, which allows a high efficiency over the wider range of the load. The M3406 is offered in a low profile 5-pin, SOT package, and is available in an adjustable version.
APPLICATIONS
Cellular and Smart Phones Wireless and DSL Modems PDAs Portable Instruments Digital Still and Video Cameras DTV
TYPICAL APPLICATION
VIN VIN M3406 CIN 10μF EN GND FB SW L 2.2μH R1 200k 1% R2 100k 1% C1 22pF opt. VOUT
COUT 10μF
Figure 1. Basic Application Circuit
M3406 Rev1.0 Aerosemi Proprietary Information.Unauthorized Photocopy and Duplication Prohibited. All Rights Reserved.
ELECTRICAL CHARACTERISTICS (Note 3)
(V IN =V EN =3.6V, V OUT =1.8V, T A = 25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN Input Voltage Range 2 Input DC Supply Current (Note 4) PWM Mode V OUT = 90%, I LOAD =0mA PFM Mode V OUT = 105%, I LOAD =0mA Shutdown Mode V EN = 0V, V IN =4.2V T A = 25°C 0.588 Regulated Feedback T A = 0°C ≤T A ≤85°C 0.586 Voltage V FB T A = -40°C ≤T A ≤85°C 0.585 Reference Voltage Line V IN =2.7V to 5.5V Regulation Output Voltage Line V IN =2.7V to 5.5V Regulation Output Voltage Load Regulation V OUT =100% Oscillation Frequency V OUT =0V On Resistance of PMOS I SW =100mA On Resistance of NMOS I SW =-100mA Peak Current Limit V IN = 3V, V OUT =90% EN High-Level Input 1.5 V ENH Voltage EN Low-Level Input V ENL Voltage EN Leakage Current SW Leakage Current V EN =0V,V IN =V SW =5V TYP MAX 6 300 35 1.0 0.612 0.613 0.615 0.40 0.40 UNIT V µA µA µA µA V V V %/V % % MHz kHz mΩ mΩ A V 0.4 ±0.01 ±0.01 ±1.0 ±1.0 V µA µA