UM3521DA

UM3521DA UNIONSEMI | Alldatasheet

Document overview

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Technical content

Features

z PDA, Pocket PCs z Wireless and DSL Modems z Low Power DSP Supply z Portable Media Players z POL applications z High Efficiency Step Down Converter z Output Current up to 600mA z Wide Vin Range from 2.0V to 5.5V for Li-ion Batteries z 2.5MHz Fixed Frequency Operation z Power Save Mode at Light Load Currents z V oltage Positioning in PFM mode +1.5% z Very Low Quiescent Current: Typ. 10uA z Very High Efficiency: Max >93%, and 54% at 20uA output with VIN=2.3V and VOUT=1.8V z Low Dropout operation: 100% Duty Cycle z Soft Start z Under-voltage Lockout z Thermal Protection z Available package: DFN6 2.0×1.8 P i n C o n f i g u r a t i o n s T o p V i e w UM3521DA DFN6 2.0×1.8

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Ordering Information

Part Number Packaging Type Marking Code Shipping Qty UM3521DA DFN6 ADA 3000pcs/7Inch Tape & Reel Pin Description Pin Number Symbol Function

1 SW Switching Pin

2 MODE Mode Select Pin. This pin is used to put the UM3521DA into fixed frequency PWM mode by pulling MODE pin high.

3 FB Pin for Feedback V oltage

4 EN Enable Pin (Active with “H”)

5 VIN Power Supply Pin

6 GND Ground Pin

Symbol Parameter Value Unit VIN Input Voltage -0.3 to +6.0 V VFB FB Voltage -0.3 to V IN+0.3 V VEN EN Voltage -0.3 to V IN+0.3 V VMODE MODE Voltage -0.3 to V IN+0.3 V VSW SW Voltage -0.3 to V IN+0.3 V TO Operating Temperature -40 to +85 °C TSTG Storage Temperature Range -65 to +150 °C

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Electrical Characteristics

(VIN=VEN=3.6V, VOUT=1.8V, VMODE=GND, TA=+25℃, unless otherwise noted) Symbol Parameter Test Conditions Min Typ Max Unit VIN Input Voltage Range 2.0 5.5 V IQ Quiescent Current VIN=3.6V, VMODE=GND 10 17 μA ISHDN Shutdown Current VEN=GND 0.1 1.0 μA VMODE=VIN, (PWM mode), IO=10mA 1.773 1.800 1.827 V VFB Regulated Feedback Voltage VMODE=GND, (PFM mode), IO=10mA 3 % IO(Max) Maximum Output Current 600 mA f Oscillator Frequency 2.00 2.25 2.50 MHz RDS(ON) of P-CH MOSFET VIN =3.6V, ISW=100mA 0.28 Ω RDS(ON) RDS(ON) of N-CH MOSFET VIN =3.6, ISW= -100mA 0.18 Ω ISW High Side Switch Current Limit 1.0 A VENH EN Pin High-Level Threshold V IN-0.3 V VENL EN Pin Low-Level Threshold GND+ 0.3 V IEN EN Pin Input Current V EN=5.5V 0.01 1 μA VMODEH MODE Pin High-Level Threshold V IN-0.3 V VMODEL MODE Pin Low-Level Threshold GND+ 0.3 V IMODE MODE Pin Input Current VMODE=5.5V 0.01 1 μA UVLO UVLO Detection Voltage 1.7 1.8 V Hys UVLO hystersis voltage 0.1 0.2 V sst Soft Start Time V EN=0V to VIN 0.15 0.3 0.6 ms Output Voltage Temperature characteristics Thermal Shutdown Temp 140 ºC

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http://www.union-ic.com Rev.01 May.2012 5 / 1 0 UM3521DA Typical Operating Characteristics (MODE=0, L=2.2μH, VOUT=1.8V , unless otherwise noted.) Efficiency vs Output Current 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 1 10 100 1000 Output Current(mA) Efficiency(%) VIN=2.3V VIN=5.0V Output Voltage vs Input Voltage 1.7 1.75 1.8 1.85 1.9 012345 Input Voltage(V) Output Voltage(V) Quiescent Current vs Input Voltage 23456 Input Voltage(V) Quiescent Current(uA) EN=VIN, Device not switching Output Voltage vs Output Current 1.75 1.77 1.79 1.81 1.83 1.85 1.87 1.89 0 100 200 300 400 500 600 700 800 Output Current(mA) Output Voltage(V) VIN=2.3V VIN=5.0V Iout=300mA

http://www.union-ic.com Rev.01 May.2012 6 / 1 0 UM3521DA FB Voltage(PWM Mode) vs Temperature 1.74 1.76 1.78 1.8 1.82 1.84 1.86 1.88 1.9 - 5 0- 2 5 0 2 5 5 0 7 51 0 0 1 2 5 Temperature(℃) FB Voltage(V) FB Voltage(PFM Mode) vs Temperature 1.74 1.76 1.78 1.8 1.82 1.84 1.86 1.88 1.9 - 5 0 - 2 5 0 2 55 07 5 1 0 0 1 2 5 Temperature(℃) FB Voltage(V) Quies cent Current vs Temperature - 5 0 - 2 5 0 2 55 07 5 1 0 0 1 2 5 Temperature(℃) Quiescent Current(uA) Typical Operating Characteristics (MODE=0, L=2.2μH, VOUT=1.8V , unless otherwise noted.) VIN=3.6V, MODE=VIN, Iout=10mA VIN=3.6V, MODE=0, Iout=10mA VIN=3.6V, MODE=0, EN=VIN,

http://www.union-ic.com Rev.01 May.2012 7 / 1 0 UM3521DA Typical Operating Characteristics (Continued) (MODE=0, L=2.2μH, VOUT=1.8V , unless otherwise noted.) Typical Operation (PFM Mode) Typical Operation (PWM Mode) L o a d T r a n s i e n t ( P W M M o d e ) L o a d T r a n s i e n t ( P W M M o d e ) VIN=3.6V, VOUT=1.8V, Iout=0.01A, MODE=0V VIN=2.5V, VOUT=1.8V, Iout=0 A, MODE=VIN VIN=3.6V, VOUT=1.8V, Iout=30 to 400m A, MODE=VIN VIN=3.6V, VOUT=1.8V, Iout=400 to 30m A, MODE=VIN SW VOUT SW VOUT IOUT VOUT VOUT IOUT

http://www.union-ic.com Rev.01 May.2012 8 / 1 0 UM3521DA Typical Operating Characteristics (Continued) (MODE=0, L=2.2μH, VOUT=1.8V , unless otherwise noted.) Load Transient (PFM Mode) Load Transient (PFM Mode) Load Transient (PFM to PWM Mode) Load Transient (PWM to PFM Mode) VIN=3.6V, VOUT=1.8V, Iout=30 to 100mA, MODE=0V VIN=3.6V, VOUT=1.8V, Iout=100 to 30m A, MODE=0V VOUT VOUT IOUT IOUT VOUT IOUT VOUT IOUT 30mA 400mA 400mA 30mA

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Package Information

UM3521DA DFN6 2.0×1.8 Outline Drawing D C b e Top View Bottom View Side View DIMENSIONS MILLIMETERS Symbol Min Typ Max A 0.70 0.75 0.80 A1 0 0.02 0.05 A2 - 0.15 - b 0.15 0.20 0.25 C 0.25 0.30 0.35 D 1.75 1.80 1.85 E 1.95 2.00 2.05 D1 0.80BSC E1 1.20BSC e 0.50BSC L 0.25 0.30 0.35 Land Pattern 0.3 0.2 1.2 0.5 0.5 NOTES: 1. Compound dimension: 2.0×1.8； 2. Unit: mm; 3. General tolerance ±0.05mm unless otherwise specified; 4. The layout is just for reference. Tape and Reel Orientation

http://www.union-ic.com Rev.01 May.2012 1 0 / 1 0 UM3521DA IMPORTANT NOTICE The information in this document has been ca refully reviewed and is believed to be accurate. Nonetheless, this document is subjec t 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 rese rves 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: 7F, No. 5, Bibo Road, Shanghai 201203 Tel: 021-51097928 Fax: 021-51026018 Website: www.union-ic.com