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ME3103
Typical Performance Characteristics
1. Efficiency VS Output Current
Efficiency VS.Output Current 100 90
Efficiency (%)
(VO=1.8V)
Efficiency VS Output Current
ME3103
1A Step-Down DC-DC Converter ME3103
General Description
The ME3103 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 ME3103 provides a power-saving pulse -Skipping Modulation (PSM) mode to reduce quiescent current under light load operation to save power. The ME3103 supports a range of input voltages from 2.5V to 5.5V, allowing the use of a single
Block Diagram
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ME3103
Electrical Characteristics
（VIN = VEN=3.6V, VO=1.8V, CIN =10μF, CO =22μF, L=4.7μH, CFW =100pF ,TA =25 ° C, unless otherwise noted.） 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 Symbol VIN VFB △VFB VO IPK LNR LDR IQ ISD FOSC VFB=0V or VO=0V PMOS Drain-Source On-State Resistance SW Leakage Current High Efficiency EN Threshold High EN Threshold Low EN Leakage Current Over Temperature Protection OTP Hysteresis RDS(ON) ILSW η VEH VEL IEN OTP OTH IDS=100mA NMOS 1.5 0.35 ± 0.01 96 ± 0.01 160 40 0.5 1 0.3 1 500 0.3 0.45 KHz Ω Ω μA % V V μA ° C ° C IO =100mA VIN = VEN =3V,VFB =0.5V or Vo=90% VIN =VEN= 2.5V to 5V,Io=10mA Io=1.0mA to 800mA No load VEN=0V VO=100% Test condition Min 2.5 0.588 -3 1.2 Typ. 0.6 0.3 1.5 0.2 0.5 40 0.1 1.5 Max 5.5 0.612 +3 0.5 1.5 70 1 1.8 Unit V V %/V % A %/V % μA μA MHz
Applications
● ● ● ● ● ● ● ● Cellular Phone Portable Electronics Wireless Devices Cordless Phone Computer Peripherals Battery Powered Widgets Electronic Scales Digital Frame
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
4
Input Voltage(V)
4.5
5
5.5
0
200
400
600
800
1000
Output Current(mA)
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ME3103
5. Output Voltage VS Output Current(VO=1.8V)
Output Voltage VS Output Current 1.825 1.82 1.815 1.81 1.805 1.8 1.795 1.79 1.785 10
4. VFB VS Output Current
VFB VS Output Current
0.608 0.604
VFB (V)
VFB (V)
0.6 0.596 0.592 0.588 0.584
VIN=2.5V VIN=3.6V VIN=4.2V
IO=800mA
IO=600mA
IO=100mA
3
3.5
Supply Current(uA)
8. Dynamic Supply Current VS Temperature (VIN=3.6V，VO=1.8V)
Dynamic Supply Current VS Temperature
60
Dynamic Supply Current(uA )
50 40 30 20 10 0 0 20 40 60 80 100 120 140
Pin Configuration Pin information
Pin Number 1 2 3 4 5 Name EN GND SW VIN FB Function Chip Enable Ground Switch Input Feedback
Absolute Maximum Ratings
Parameter Power supply voltage, VIN voltage at EN、FB Pin voltage at SW Pin Internal Power Dissipation, （SOT23-5） Operating Ambient Temperature Storage Temperature Soldering temperature and time Symbal VIN VEN,VFB VSW PD Topr Tstg Tsolder Rating -0.3～6.0 -0.3～VIN -0.3～VIN + 0.3 300 -40~85 -40~+150 260° C, 10S Unit V V V mW ° C ° C ° C
IO=10mA IO=100mA IO=800mA
3.5
3.75
4
4.25
4.5
4.75
5
5.25
5.5
Input Voltage(V)
3. VFB VS Input Voltage
VFB VS Input Voltage 0.61 0.608 0.606 0.604 0.602 0.6 0.598 0.596 0.594 2.5
Efficiency(%)
Efficiency VS Input Voltage (VO=3.3V)
Efficiency VS.Input Voltage
100 90 80 70 60 50 40 30 IO=10mA IO=100mA IO=800mA
90 80 70 60 50 40 30 2.5 3 3.5 4 Input Voltage(V) 4.5 5 5.5
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, while the part number suffix ME3103 indicates pre-set output voltage of 3.3V, 2.8V, 2.5V, 1.8V, 1.5V, 1.2V or adjustable. All versions employ internal power switch and synchronous rectifier for 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.