UM3510 1A, 2.25MHz, Synchronous Step-Down DC-DC Converter UM3510S SOT23-6 UM3510DA DFN6 2.0×2.0 General Description The UM3510 is a high efficiency pulse-width-modulated (PWM) synchronous step-down DC-DC converter with an input voltage range of 2.5V to 6.0V. It provides up to 1000mA output current from a single Li-ion cell. The UM3510 operates at 2.25MHz fixed switching frequency and enters Power Save Mode to maintain high efficiency at light load condition. For low noise applications, the device can be forced into fixed frequency PWM mode by pulling the MODE pin high. The UM3510 enters shutdown mode and consumes less than 1μA when EN pin is pulled low. Other features include lower internal reference voltage with 2% accuracy, over temperature protection and over current protection. The UM3510 is available in SOT23-6 and 2mm×2mm 6-pin DFN packages. Applications Features Cellular and Smart Phones Microprocessors and DSP Core Supplies Wireless and DSL Modems PDAs, GPS WLAN Portable Instruments High Efficiency: Up to 95% 2.25MHz Constant Switching Frequency 1000mA Output Current Integrated Main Switch and Synchronous Rectifier. No Schottky Diode Required. 2.5V to 6.0V Input Voltage Range Low Quiescent Current: 56µA Thermal Fault Protection <1µA Shutdown Current Typical Application Circuit L1 2.2µH VIN 2.5V to 6V VIN SW R1 360kΩ EN CIN 10µF VOUT 1.8V, 1000mA C1 22pF UM3510 GND MODE FB R2 180kΩ Top View 6 FB 1 6 EN MODE 2 5 VIN SW 3 4 GND 5 UCB 1 2 4 M Pin Configurations COUT 10µF 3 M: Month Code UM3510S SOT23-6 ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 1/13 UM3510 SW Top View 1 MODE 2 FB 3 Exposed Thermal Pad 6 GND 5 VIN 4 EN AAH M Pin Configurations M: Month Code UM3510DA DFN6 2.0×2.0 (Top View) Ordering Information Part Number Packaging Type Marking Code Shipping Qty UM3510S SOT23-6 UCB UM3510DA DFN6 2.0×2.0 AAH 3000pcs/7Inch Tape & Reel Pin Description Pin Number Symbol Function 1 SW 2 MODE 3 FB 4 EN 5 VIN Input voltage. 6 GND Ground. Power switch output. It is the switch node connection to the inductor. This pin connects to the drains of the internal P-CH and N-CH MOSFET switches. MODE pin=high forces the device to operate in fixed-frequency PWM mode. Mode pin=low enables the Power Save Mode with automatic transition from PFM mode to fixed-frequency PWM mode. Feedback input pin. Connect FB to the center point of the external resistor divider. Regulator enable control input. Pulling this pin to high enables the device. Pulling this pin to low forces the device into shutdown mode. This pin must be terminated. ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 2/13 UM3510 Absolute Maximum Ratings (Note 1) Symbol Value Unit -0.3 to +7.0 V EN, FB Voltages -0.3 to VIN+0.3 V VSW SW Voltage -0.3 to VIN+0.3 V ISW Peak SW Sink and Source Current 2.0 A TO Operating Temperature -40 to +85 °C Storage Temperature Range -65 to +150 °C VIN VEN,VFB TSTG Parameter Input Voltage Note 1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 3/13 UM3510 Electrical Characteristics (VIN=VEN=3.6V, TA=+25ºC, unless otherwise noted) Symbol Parameter Test Conditions SUPPLY VIN Input Voltage Range Under Voltage Lockout UVLO Falling Edge Threshold Under Voltage Lockout UVLO_HYS Hysteresis Input DC Supply ILOAD=0mA Current (MODE=GND) IQ Input DC Supply ILOAD=0mA Current (MODE=VIN) Input Supply Current ISD VFB=0V, VIN=6.0V (Shutdown Mode) OUTPUT Regulated Feedback VFB TA=+25ºC Voltage IFB FB Input Bias Current VFB=0.65V 2.5V≤VIN≤6.0V, Output Voltage Line IOUT=10mA, Regulation MODE=VIN/GND Output Voltage Load 0.1A≤IOUT≤1A Regulation Maximum Output IO(MAX) Current tSS Soft Start Time VEN=0V, VIN=6V, ISWL SW Leakage VSW=0V or 6V POWER SWITCH RDS(ON) of P-CH VIN=3.6V, MOSFET ISW=100mA RDS(ON) RDS(ON) of N-CH VIN=3.6, MOSFET ISW=-100mA IP Peak Inductor Current VIN=2.5V to 6.0V Thermal Shutdown Temperature Thermal Shutdown Temperature Hysteresis OSILLATOR f Oscillator Frequency ENABLE, MODE VIH High-Level Threshold VIL Low-Level Threshold II Input Leakage Current Min Typ Max Unit 2.5 6.0 V 1.8 2.3 V 200 56 mV 80 5.6 0.588 mA 0.1 1.0 μA 0.600 0.612 V 30 nA 0.20 %/V 0.10 0.5 %/A 1000 mA μs 400 1.6 1.95 μA ±0.01 ±1 μA 0.25 0.30 Ω 0.18 0.23 Ω 1.8 2.0 A 150 ºC 20 ºC 2.25 2.55 MHz 0.4 1 V V μA 1.2 0.1 ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 4/13 UM3510 Typical Operating Characteristics Efficiencyvs. vs.Load Load Current Current Efficiency Vout=1.8V, ForcedPWM PWM Mode Mode VOUT =1.8V, Forced 100 100 90 90 80 80 70 70 Ef f iciency (%) Ef f iciency (%) Efficiencyvs. vs. Load Load Current Efficiency Current Power Save Save Mode VVout=1.8V, Mode OUT=1.8V, Power 60 50 40 VIN=2.5V VIN=2.5V VIN=3.6V VIN=3.6V VIN=4.2V VIN=4.2V VIN=6.0V VIN=6.0V 30 20 10 60 50 40 VIN=2.5V VIN=2.5V VIN=3.6V VIN=3.6V VIN=4.2V VIN=4.2V VIN=6.0V VIN=6.0V 30 20 10 0 0 1 10 100 Output Current (mA) 1 1000 100 100 90 90 80 80 70 70 60 50 40 30 VVIN=3.6V IN=3.6V VVIN=4.2V IN=4.2V VVIN=6.0V IN=6.0V 20 10 60 50 40 30 VIN=3.6V VIN=3.6V VIN=4.2V VIN=4.2V VIN=6.0V VIN=6.0V 20 10 0 0 1 10 100 Output Current (mA) 1000 1 Output Voltage Voltage vs. Output vs. Load LoadCurrent Current V Vout=1.8V,Mode=L OUT=1.8V, MODE=L 1.840 1.840 1.835 1.835 1.830 1.825 1.820 VIN=2.5V VIN=2.5V VIN=3.6V VIN=3.6V VIN=4.2V VIN=4.2V VIN=6.0V VIN=6.0V 1.815 10 100 Output Current (mA) 1.830 1.825 1.820 VIN=2.5V VIN=2.5V VIN=3.6V VIN=3.6V VIN=4.2V VIN=4.2V VIN=6.0V VIN=6.0V 1.815 1.810 1.810 1 10 100 Output Current (mA) 1000 OutputVoltage Voltage vs. Load Output LoadCurrent Current VOUT=1.8V, MODE=H Vout=1.8V,Mode=H Output Voltage (V) Output Voltage (V) 1000 Efficiency vs. Efficiency vs.Load LoadCurrent Current VOUT =3.3V, Forced Vout=3.3V, ForcedPWM PWMMode Mode Ef f iciency (%) Ef f iciency (%) Efficiency vs. vs. Load Load Current Efficiency Current Power Save Mode VVout=3.3V, Mode OUT=3.3V, Power 10 100 Output Current (mA) 1000 1 10 100 Output Current (mA) 1000 ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 5/13 UM3510 Typical Operating Characteristics (Continued) Output Load Current Current OutputVoltage Voltage vs. vs. Load VOUT=3.3V, MODE=H Vout=3.3V, Mode=H 3.340 3.340 3.330 3.330 Output Voltage (V) Output Voltage (V) Output Voltage Output Voltagevs. vs.Load LoadCurrent Current VVout=3.3V, OUT=3.3V, MODE=L Mode=L 3.320 3.310 3.300 3.290 VIN=4.2V VIN=4.2V VIN=6.0V VIN=6.0V 3.280 3.320 3.310 3.300 3.290 VIN=4.2V VIN=4.2V VIN=6.0V VIN=6.0V 3.280 3.270 3.270 1 10 100 Output Current (mA) 1000 1 1000 OutputVoltage Voltage vs. Output vs. Temperature Temperature VIN=3.6V, MODE=H, LOAD=10mA Vin=3.6V, Mode=H, IIload=10mA 1.825 1.820 1.820 Output Voltage (V) 1.825 1.815 1.810 1.805 1.800 1.815 1.810 1.805 1.800 1.795 1.795 -40 -15 10 35 Temperature (°C) 60 85 -40 Supply Current Currentvs. vs.Supply Supply Voltage Voltage PowerSave SaveMODE, Mode,Mode=L MODE=L Power -15 10 35 Temperature (°C) 60 85 Supply SupplyVoltage Voltage SupplyCurrent Current vs. Supply ForcedPWM PWM Mode, MODE, MODE=H Mode=H Forced 80 10 70 8 Supply Current (mA) Supply Current (μA) Output Voltage (V) OutputVoltage Voltagevs. vs.Temperature Temperature Output VIN=3.6V,Mode=L, MODE=L,Iload=10mA ILOAD=10mA Vin=3.6V, 10 100 Output Current (mA) 60 50 40 6 4 2 30 0 20 2.5 3 3.5 4 4.5 5 Supply Voltage (V) 5.5 6 2.5 3 3.5 4 4.5 5 5.5 6 Supply Voltage (V) ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 6/13 UM3510 Typical Operating Characteristics (Continued) Frequency vs. Supply Voltage Frequency vs. Supply Voltage VVout=1.8V, ILOAD=200mA OUT=1.8V, Iload=200mA 70 2600 65 2500 Frequency (kHz) Supply Current (μA) SupplyCurrent Currentvs. vs. Temperature Temperature Supply MODE=L VVIN=6V, IN=6V, MODE=L 60 55 50 45 2400 2300 2200 2100 2000 1900 40 -50 -25 0 25 50 Temperature (°C) 75 100 2.5 125 3.5 4 4.5 5 5.5 6 Supply Voltage (V) vs.Input InputVoltage Voltage H-Side Rds(on) RDS(ON) vs. L-Side RDS(ON) vs. L-Side Rds(on) vs.Input InputVoltage Voltage 0.35 0.40 0.30 0.35 0.30 RDS(ON) (Ω) 0.25 RDS(ON) (Ω) 3 0.20 0.15 0.10 0.25 0.20 0.15 0.10 0.05 0.05 0.00 0.00 2.5 3.0 3.5 4.0 Input Voltage (V) 4.5 5.0 2.5 3.0 3.5 4.0 4.5 Input Voltage (V) 5.0 5.5 6.0 ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 7/13 UM3510 Typical Operating Characteristics (Continued) Load Transient Response Load Transient Response VIN=2.5V, VOUT=1.8V, MODE=L VIN=2.5V, VOUT=1.8V, MODE=H VOUT VOUT 200mV/div 200mV/div ILOAD=850mA ILOAD ILOAD=50mA 500mA/div ILOAD=850mA ILOAD=50mA ILOAD 100μs/div 500mA/div Line Transient Response ILOAD=50mA 100μs/div Line Transient Response VIN=3.5V to 4.5V, VOUT=1.8V, ILOAD=50mA, MODE=L VIN ILOAD=50mA VIN=3.5V to 4.5V, VOUT=1.8V, ILOAD=50mA, MODE=H VIN 2.0V/div 2.0V/div VOUT VOUT 100μs/div 20mV/div 20mV/div PFM Mode Operation PWM Mode Operation VIN=3.6V, VOUT=1.8V, ILOAD=10mA, MODE=L VOUT 100μs/div VIN=3.6V, VOUT=1.8V, ILOAD=10mA, MODE=H VOUT 20mV/div 20mV/div VSW VSW 2.0V/div 50μs/div 2.0V/div 1.0μs/div ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 8/13 UM3510 Application Information Output Voltage Setting The output voltage can be caculated according to the formula below with an internal reference volatge VREF typical 0.6V: R1 VOUT = VREF × 1 + R2 To minimize the current through the feedback divider network, the recommended value of R2 is about 180kΩ. The sum of R1 and R2 should not exceed about 1MΩ to keep the network robust against noise. An external feed forward capacitor C1 is required for optimum load transient response. The value of C1 should be in the range between 10pF and 33pF. Route the FB line away from noise sources, such as the inductor or the SW line. Inductor Selection A 1µH to 10µH inductor with DC current rating at least 25% higher than the maximum load current is recommended for most applications. For best efficiency, the inductor DC resistance shall be <200mΩ. For most designs, the inductance value can be derived from the following equation: VOUT × VIN − VOUT L= VIN × ∆IL × fOSC Where ∆IL is the inductor ripple current. Choose inductor ripple current approximately 30% of the maximum load current, 1000mA. The maximum inductor peak current is: ∆IL IL MAX = ILOAD + 2 The following table is a list of recommended inductors. 3 Dimension [mm ] 4.5×4×3.2 3×3×1.5 3×3×1.5 List of Recommended Inductors Inductor Type Supplier 744773022 Würth Elektronik LQH3NPN2R2NM0 MURATA LPS3015 Coilcraft Input Capacitor Selection The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input capacitor impedance at the switching frequency shall be less than the input source impedance to prevent high frequency switching current passing to the input. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. For most applications, a 10µF capacitor is sufficient. The input capacitor can be increased without any limit for better input voltage filtering. Output Capacitor Selection The output capacitor keeps output voltage ripple small and ensures regulation loop stable. The output capacitor impedance shall be low at the switching frequency. Ceramic capacitor with X5R or X7R dielectrics are recommended. The output ripple ∆VOUT is approximately: VOUT × VIN − VOUT 1 ∆VOUT ≤ × ESR + VIN × fOSC × L 8 × fOSC × COUT ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 9/13 UM3510 Layout Guidance When laying out the PC board, the following suggestions should be taken to ensure proper operation of the UM3510. 1. The power traces, including the GND trace, the SW trace and the VIN trace should be kept short, direct and wide to allow large current flow. 2. Connect the input capacitor CIN to the VIN pin as closely as possible to get good power filter effect. 3. Keep the switching node, SW, away from the sensitive FB node. 4. Do not trace signal line under inductor. ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 10/13 UM3510 Package Information UM3510S: SOT23-6 Outline Drawing D 5 4 1 2 3 L L1 E E1 6 Symbol θ b e c e1 0.20 Top View A A2 A1 End View Side View A A1 A2 b c D E E1 e e1 L L1 θ DIMENSIONS MILLIMETERS Min Max 1.05 1.25 0.00 0.10 1.05 1.15 0.30 0.50 0.10 0.20 2.82 3.02 1.50 1.70 2.65 2.95 0.95REF 1.80 2.00 0.60REF 0.30 0.60 0° 8° INCHES Min Max 0.041 0.049 0.000 0.004 0.041 0.045 0.012 0.020 0.004 0.008 0.111 0.119 0.059 0.067 0.104 0.116 0.037REF 0.071 0.079 0.023REF 0.012 0.024 0° 8° Land Pattern 2.4 0.9 0.7 0.95 0.95 NOTES: 1. Compound dimension: 2.92×1.60； 2. Unit: mm; 3. General tolerance ±0.05mm unless otherwise specified; 4. The layout is just for reference. UCB M Tape and Reel Orientation ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 11/13 UM3510 UM3510DA DFN6 2.0×2.0 Outline Drawing Symbol D2 E E2 L D A 0.57 - 0.80 0.022 - 0.031 A1 0.00 - 0.05 0.000 - 0.002 A3 Pin #1 ID b PIN 1 DOT BY MARKING DIMENSIONS INCHES MILLIMETERS Typ Max Min Typ Max Min Top View 0.20REF 0.008REF b 0.25 0.30 0.35 0.010 0.012 0.014 D 1.95 2.00 2.075 0.077 0.079 0.082 D2 1.05 - 1.75 0.041 - 0.069 E 1.95 2.00 2.075 0.077 0.079 0.082 E2 0.45 - 1.06 0.018 - 0.042 e A1 A A3 Bottom View Side View e L 0.65BSC 0.25 - 0.026BSC 0.45 0.010 - 0.018 0.25 Land Pattern 2.00 0.96 0.57 2.00 2.50 1.65 0.65 0.35 NOTES: 1. Compound dimension: 2.00×2.00； 2. Unit: mm; 3. General tolerance ±0.05mm unless otherwise specified; 4. The layout is just for reference. Tape and Reel Orientation AAH M ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 12/13 UM3510 GREEN COMPLIANCE Union Semiconductor is committed to environmental excellence in all aspects of its operations including meeting or exceeding regulatory requirements with respect to the use of hazardous substances. Numerous successful programs have been implemented to reduce the use of hazardous substances and/or emissions. All Union components are compliant with the RoHS directive, which helps to support customers in their compliance with environmental directives. For more green compliance information, please visit: http://www.union-ic.com/index.aspx?cat_code=RoHSDeclaration IMPORTANT NOTICE The information in this document has been carefully reviewed and is believed to be accurate. Nonetheless, this document is subject to change without notice. Union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contained information, or to notify a person or organization of any update. Union reserves the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. Union Semiconductor, Inc Add: Unit 606, No.570 Shengxia Road, Shanghai 201210 Tel: 021-51093966 Fax: 021-51026018 Website: www.union-ic.com ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2016 13/13