UM3429 UNIONSEMI | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 12
Technical content
Features
Digital Cameras LCD Bias Supplies Handheld Instruments Wireless Handsets GPS Receivers Up to 92% Efficiency Output Load Disconnection Internal Synchronous Rectifier Low Voltage Start-Up: 0.85V Input Current Limit Pulse Skipping Mode Operation with Typical IQ as 40μA Shutdown Current Lower than 1µA 1MHz Switching Frequency fo r Low Profile Inductor/Capacitor Input Voltage: 0.5V to 5.0V Output Voltage: 2.5V to 5.5V Anti-Ringing Control to Reduce EMI Typical Application Circuit UM3429 SW VIN SHDN 4.7µF+ 2-CELL AA GND OFF ON FB VOUT 220k 10µF VOUT 3.3V 250mA 4.7µH 100 1 10 100 1000 Efficiency (%) Output Current (mA) Efficiency vs. Load Current VIN=1.2V VIN=1.5V VIN=2.4V VIN=3.0V Efficiency vs. Output Current VOUT=3.3V VIN=1.2V VIN=1.5V VIN=2.4V VIN=3.0V
http://www.union-ic.com Rev.02 Mar.2016 2/12 UM3429 Pin Configurations Top View VINSW VOUTGND SHDNFB 3 4 UCQ M 1 2 3 456 M: Month Code UM3429S SOT23-6 (Top View) 1VIN VOUT SHDN GND FB NC SW GND ABE M M: Month Code UM3429DA DFN8 2.0×2.0 Pin Description Pin Number Symbol Description UM3429S UM3429DA 1 7 SW Switch Pin. Connect external inductance to V IN. Keep these PCB trace lengths as short and wide as possible. 2 - GND Ground. Provide a short direct PCB path between GND and the negative electrode of COUT and CIN. - 4, 8 Ground. Connect the negative electrode of CIN to pin 8 and the negative electrode of COUT to pin 4. 3 5 FB Feedback Input Pin. Connect to the center point of the external resistor divider and set the output voltage by: 4 3 SHDN Logic Controlled Shutdown Input . Low logic active. In shutdown mode, all functions are disabled drawing < μA supply current. Do not leave SHDN floating. 5 2 VOUT Output Voltage Sense Input and Drain of the Internal Synchronous Rectifier P-MOSFET. Bias is derived from VOUT. Keep PCB trace length from V OUT to the output filter capacitor(s) as short and wide as possible. 6 1 VIN Battery Input Voltage. The device gets its start -up bias from VIN. Once VOUT exceeds VIN, bias comes from V OUT. Thus, once started, operation is completely independent from V IN. Operation is only limited by the output power level and the battery’s internal series resistance - 9 Exposed Pad The exposed pad must be soldered to the PCB ground plane. It serves as an additional ground connection and as a means of conducting heat away from the package. - 6 NC Not connected.
http://www.union-ic.com Rev.02 Mar.2016 3/12 UM3429
Ordering Information
Part Number Packaging Type Marking Code Shipping Qty UM3429S SOT23-6 UCQ 3000pcs/7Inch Tape & Reel UM3429DA DFN8 2.0×2.0 ABE Absolute Maximum Ratings (Note 1) Symbol Parameter Value Unit VIN VIN Supply Voltage -0.3 to +6.0 V VSW SW Voltage -0.3 to +6.0 V VFB FB Voltage -0.3 to +6.0 V VSHDN SHDN Voltage -0.3 to +6.0 V VOUT Output Voltage -0.3 to +6.0 V TOP Operating Temperature Range -40 to +85 °C TSTG Storage Temperature Range -65 to +150 °C TL Maximum Lead Temperature (Soldering , 10s) +260 °C Note 1: Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditio ns) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected.
http://www.union-ic.com Rev.02 Mar.2016 4/12 UM3429
Electrical Characteristics
(VIN=+1.2V, VOUT=+3.3V, TA=+25°C, unless otherwise noted.) Parameter Test Conditions Min Typ Max Unit Minimum Start-up V oltage ILOAD=1mA, VOUT=0V 0.85 1 V Minimum Operating V oltage SHDN =VIN (Note 2) 0.5 0.65 V Maximum Input V oltage 5 V Adjustable Output V oltage Range 2.5 5 V Feedback V oltage 0.595 0.6 0.605 V Feedback Input Current VFB=0.6V 1 50 nA Quiescent Current (Pulse Skipping Mode) VFB=0.7V, VIN=SHDN (Note 3) 40 µA Quiescent Current (Normal) VFB=0.5V, VIN=SHDN (Note 3) 1.4 mA Quiescent Current (Shutdown) SHDN =0V 1 µA NMOS Leakage Current VSW=5V 0.5 µA PMOS Leakage Current VSW=5V, VOUT=0V 0.5 µA NMOS On-Resistance 0.4 Ω PMOS On-Resistance 0.5 Ω NMOS Current limit 600 850 mA Pulse Skipping Mode Operation Current Threshold L=4.7µH 5 mA Max Duty Cycle 80 90 % Switching Frequency 0.8 1 1.2 MHz SHDN Input High 1 V SHDN Input Low 0.35 V SHDN Input Current SHDN =5.5V 0.01 1 µA Note 2: Minimum VIN operation after start-up is only limited by the battery’s ability to provide the necessary power as it enters a deeply discharged state. Note 3: Pulse skipping mode and normal operation IQ is measured at VOUT. The chip is in the open loop status and the inductor should not be soldered.
http://www.union-ic.com Rev.02 Mar.2016 5/12 UM3429 Typical Operating Characteristics (CIN=4.7µF, COUT=10µF, L=4.7µH , TA=25°C, unless otherwise specified) 100 1 10 100 1000 Efficiency (%) Output Current (mA) Efficiency vs. Load Current VIN=1.2V VIN=1.5V VIN=2.4V VIN=3.0V 100 1 10 100 1000 Efficiency (%) Output Current (mA) Efficiency vs. Load Current VIN=2.4V VIN=3.0V VIN=3.6V VIN=4.2V 3.29 3.30 3.31 3.32 3.33 3.34 3.35 1 10 100 1000 Output Voltage (V) Output Current (mA) VOUT vs. Output Current VIN=1.2V VIN=1.5V VIN=2.4V VIN=3.0V 4.99 5.00 5.01 5.02 5.03 5.04 5.05 1 10 100 1000 Output Voltage (V) Output Current (mA) VOUT vs. Load Current VIN=2.4V VIN=3.0V VIN=3.6V VIN=4.2V 100 -20 -10 0 10 20 30 40 50 60 70 80 90 Efficiency (%) Temp (°C) Efficiency vs.Temp VIN=1.2V, IOUT=50mA VIN=2.4V, IOUT=100mA 3.31 3.32 3.33 3.34 3.35 3.36 3.37 -20 -10 0 10 20 30 40 50 60 70 80 90 Output Voltage (V) Temp (°C) Vout vs.Temp VIN=1.2V, IOUT=50mA VIN=2.4V, IOUT=100mA 0.50 0.75 1.00 1.25 1.50 1.75 2.00 0 10 20 30 40 50 60 70 80 90 100 110 120 Minimum Start-up Voltage (V) Current (mA) Minimum Start-up Voltage vs. Current L=2.2uH L=4.7uH Output Current (mA) Input Voltage (V) Burst Mode Output Current Threshold vs. Input Voltage VOUT=5V VOUT=3.3V Minimum Start-up Voltage vs. Current Efficiency vs. Output Current Output Voltage vs. Output Current Output Voltage vs. Output Current Efficiency vs. Output Current Efficiency vs. Temp VOUT=3.3V VOUT=5V VOUT=5V VOUT=3.3V VOUT=3.3V Output Voltage vs. Temp VOUT=3.3V Pulse Skipping Mode Output Current Threshold vs. Input Voltage VIN=1.2V VIN=1.5V VIN=2.4V VIN=3.0V VIN=2.4V VIN=3.0V VIN=3.6V VIN=4.2V VIN=1.2V VIN=1.5V VIN=2.4V VIN=3.0V VIN=2.4V VIN=3.0V VIN=3.6V VIN=4.2V VIN=1.2V, IOUT=50mA VIN=2.4V, I OUT=100mA VIN=1.2V, IOUT=50mA VIN=2.4V, I OUT=100mA L=2.2µH L=4.7µH VOUT=5V VOUT=3.3V
http://www.union-ic.com Rev.02 Mar.2016 6/12 UM3429 Typical Operating Characteristics (Continued) (VIN=1.5V, VOUT=3.3V, CIN=4.7µF, COUT=10µF, L=4.7µH , TA=25°C, unless otherwise specified) SW Pin Normal Mode Operation VSW 1V/div Time, 200ns/div IOUT=50mA, Inductor Current in Continuous Mode SW Pin Anti-Ringing Operation VSW 1V/div Time, 200ns/div IOUT=20mA, Inductor Current in Discontinuous Mode Line Transient Response VIN 1V/div Time, 200µs/div VIN=1.5V to 2.5V, IOUT=50mA VOUT 100mV/div Load Transient Response IOUT 50mA/div Time, 2ms/div IOUT=1mA to 50mA VOUT 200mV/div Pulse Skipping Mode Ripple VOUT 20mV/div Time, 50µs/div IOUT=1mA, AC Coupled Ripple and Noise VOUT 20mV/div Time, 2µs/div IOUT=20mA, AC Coupled, BW=20MHz Ripple and Noise VOUT 20mV/div Time, 2µs/div IOUT=100mA, AC Coupled, BW=200MHz Ripple and Noise VOUT 20mV/div Time, 2µs/div IOUT=100mA, AC Coupled, BW=20MHz
http://www.union-ic.com Rev.02 Mar.2016 7/12 UM3429 Block Diagram SLOPE COMP PWM CONTROL PWM COMPARATOR RAMP GEN 500kHz MUX A B A/BSTART-UP OSC VOUT GOOD - 2.3V SYNC DRIVE CONTROL VIN WELL SWITCH PULSE SKIPPING MODE OPERATION CONTROL SHUTDOWN CONTROL EA 0.6V REF CURRENT SENSE VOUT 2.5V to 5V COUT FB GND + 1V to 5VCIN SW VIN 4SHDN Function Description The UM3429 is a synchronous rectified, 1MHz fixed frequency, step-up DC/DC converter in low profile SOT23 -6 and DFN8 2.0×2.0 packages. It features start -up voltage low to 0.85V, low RDS(ON) internal MOSFET switch es, current mode PWM controller and 0.6V internal reference voltage. Refer to the Block Diagram for better understanding. Low Voltage Start-up The UM3429 has an independent start -up oscillator. When the input voltage rises to 0.85V, the oscillator starts up. The frequency and duty cycle of the oscillator will be set to a fixed one (Typically: the frequency is 275kHz and the duty is 67% ). In this status, the chip is in the open loop operation. The device gets its start -up bias from V IN. Once V OUT exceeds VIN, bias comes from V OUT. The chip is still in the open loop operation in this status. When the output voltage rises to 2.3V, the chip will switch to closed loop. The chip enters normal operation then. Anti-Ringing Control An internal 5 Ω resistor will be connected from SW to VIN to damp resonant circuit formed by L and CSW when the inductor current is in the discontinuous mode. That eliminates switch ringing and reduces EMI interference.
converter and saves energy of the battery. connects the substrate to VIN. Please refer to the Block Diagram for better understanding. improvement in output current capability. bobbin inductor. See Table 1 for some suggested inductors and suppliers. Table 1. Recommended Inductors
can be used. Table 2 below shows a list of several ceramic capacitor suppliers. Table 2. Recommended Capacitor Suppliers Information
- Consideration should be taken first to place COUT as closely as possible to the VOUT and GND
- The power traces, including the GND, SW , VIN and VOUT should be kept short, direct and
wide to allow large current flow.
- Connect the input capacitor CIN to the GND pin as closely as possible to get good power filter
effect and reduce ground bounce.
- Keep the switching node away from the sensitive FB node.
- Do not trace signal line under inductor.
- Keep the GND plane under the converter as complete as possible in double-sided PCB board.
- For the UM3429DA, connect pin 4, 8 and the expose pad together to the ground plane by vias
to conduct the heat away from the package.
http://www.union-ic.com Rev.02 Mar.2016 10/12 UM3429
Package Information
UM3429S: SOT23-6 Outline Drawing b D E e A Top View Side View 1 3 c L θ End View 6 5 DIMENSIONS Symbol MILLIMETERS INCHES Min Typ Max Min Typ Max b 0.30 - 0.50 0.012 - 0.020 D 2.82 - 3.10 0.111 - 0.122 e 0.95REF 0.037REF e1 1.90REF 0.075REF L 0.30 - 0.60 0.012 - 0.024 θ 0° - 8° 0° - 8° Land Pattern 0.56 0.95 0.95 2.35 1.20 NOTES: 1. Compound dimension: 2.92×1.60； 2. Unit: mm; 3. General tolerance ±0.0 5mm unless otherwise specified; 4. The layout is just for reference. Tape and Reel Orientation MUCQ
http://www.union-ic.com Rev.02 Mar.2016 11/12 UM3429 UM3429DA: DFN8 2.0×2.0 Outline Drawing e b L A D E Pin #1 ID Top View Bottom View Side View PIN 1 DOT BY MARKING DIMENSIONS Symbol MILLIMETERS INCHES Min Typ Max Min Typ Max A 0.55 - 0.80 0.022 - 0.031 A1 0.00 - 0.05 0.000 - 0.002 A3 0.20REF 0.008REF b 0.18 - 0.30 0.007 - 0.012 D2 1.35 - 1.80 0.053 - 0.071 E2 0.75 - 1.00 0.030 - 0.039 e 0.50TYP 0.020TYP Land Pattern 0.50 0.25 0.70 2.00 0.55 1.70 2.00 2.40 0.20 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 ABE M
http://www.union-ic.com Rev.02 Mar.2016 12/12 UM3429 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 organ ization 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