Application Note: SY98081/A/B/C/D/E/F
High Efficiency 3MHz, 0.6A Inductor Built-in Synchronous Step Down Regulator Preliminary Specification
General Description
SY98081/A/B/C/D/E/F are 3MHz, 0.6A synchronous step-down converters which integrates an inductor and a control IC in one tiny package (2.0mm×1.5mm, H=1.26mm). It can operate over a wide input voltage range from 2.5V to 5.5V and integrate main switch and synchronous switch with very low RDS (ON) to minimize the conduction loss.
Features
• Low RDS(ON) for internal switches (top/bottom) 230mΩ/150mΩ • Integrate an inductor to minimizes the external components and PCB layout design • 2.5~5.5V input voltage range • Output voltage: ﹣ SY98081: Output voltage adjustable ﹣ SY98081A: Fixed 1.2VOUT ﹣ SY98081C: Fixed 1.8VOUT ﹣ SY98081D: Fixed 2.5VOUT ﹣ SY98081E: Fixed 3.3VOUT • High switching frequency 3MHz minimizes the external components • Internal soft-start limits the inrush current • 100% dropou
t operation • RoHS Compliant and Halogen Free • Output auto discharge function • Compact package: QFN2x1.5-8
Ordering Information
SY98081 □(□□)□ Temperature Code Package Code Optional Spec Code Temperature Range: -40°C to 85°C Ordering Number SY98081QUC SY98081AQUC SY98081BQUC SY98081CQUC SY98081DQUC SY98081EQUC SY98081FQUC Package QFN2×1.5-8 QFN2×1.5-8 QFN2×1.5-8 QFN2×1.5-8 QFN2×1.5-8 QFN2×1.5-8 QFN2×1.5-8 Note VOUT Adjustable Fixed 1.2VOUT Fixed 1.5VOUT Fixed 1.8VOUT Fixed 2.5VOUT Fixed 3.3VOUT Fixed 1.0VOUT
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Typical Applications
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AN_SY98081/A/B/C/D/E/F Rev. 0.4 Silergy Corp. Confidential- Prepared for Customer Use Only
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Figure1. Schematic Diagram (For SY98081A/B/C/D/E/F)
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Applications
• • • • •
Mobile phone, Smart phone Bluetooth Headsets WiMAX PDA, MID, UMPC Portable game console Digital camera, Camcorde
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﹣ SY98081F: Fixed 1.0VOUT
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﹣ SY98081B: Fixed 1.5VOUT
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SY98081/A/B/C/D/E/F
AN_SY98081/A/B/C/D/E/F Rev. 0.4 Silergy Corp. Confidential- Prepared for Customer Use Only
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Figure2. Schematic Diagram (For SY98081)
SY98081/A/B/C/D/E/F
Pinout (Top View)
Top Mark: YGxyz for SY98081 (device code: YG, x=year code, y=week code, z= lot number code) U
Mxyz for SY98081A (device code: UM, x=year code, y=week code, z= lot number code) UNxyz for SY98081B (device code: UN, x=year code, y=week code, z= lot number code) TPxyz for SY98081C (device code: TP, x=year code, y=week code, z= lot number code) UOxyz for SY98081D (device code: UO, x=year code, y=week code, z= lot number code) UPxyz for SY98081E (device code: UP, x=year code, y=week code, z= lot number code) UQxyz for SY98081F (device code: UQ, x=year code, y=week code, z= lot number code) Pin Name OUT EN GND Pin Number 1 2 3, 7 Pin Description
Output Pin. Decouple this pin to ground with at least 4.7uF ceramic cap. Enable control. Pull high to turn on. Do not float. Ground pin. SY98081
FB
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SY98081A/B/C/D/E/F LX IN 5,6 8
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Absolute Maximum Ratings (Note 1)
明水大化Supply Input Voltage, LX, OUT pins -------------------------------------------------------------------------------------- 6.0V Enable, FB Voltage---------------------------------------------------------------------------------------------------- VIN + 0.6V Power Dissipation, PD @ TA = 25°C, QFN2×1.5-8 --------------------------------------------------------------------------------------------------------- TBD Package Thermal Resistance (Note 2) θ JA ------------------------------------------------------------------------------------------------------------------- TBD θ JC --------------------------------------------------------------------------------------------------------------------TBD Junction Temperature Range ----------------------------------------------------------------------------------------------150°C Lead Temperature (Soldering, 10 sec.) ---------------------------------------------------------------------------------- 260°C Storage Temperature Range ----------------------------------------------------------------------------------- -65°C to 150°C
AN_SY98081/A/B/C/D/E/F Rev. 0.4 Silergy Corp. Confidential- Prepared for Customer Use Only
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Built-in inductor node. Leave it floating. Input pin. Decouple this pin to GND pin with at least 4.7uF ceramic cap.
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Output adjustable version. Connect this pin to the center point of the output resistor divider to program the output voltage: VOUT=0.6×(1+R1/R2). Fixed output version. Connect this pin to the output for the output voltage regulation.
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SY98081/A/B/C/D/E/F
Recommended Operating Conditions (Note 3)
Supply Input Voltage ----------------------------------------------------------------------------------------------- 2.5V to 5.5V Junction Temperature Range ----------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range ------------------------------------------------------------------------------------ -40°C to 85°C
Electrical Characteristics
(VIN = 5V, VOUT = 1.8V, COUT = 4.7uF, TA = 25°C, unless otherwise specified)
PFET RON NFET RON Inductance PFET Current Limit EN rising threshold EN falling threshold Input UVLO threshold UVLO hysteresis Oscillator Frequency Min ON Time Max Duty Cycle Soft Start Time Thermal Shutdown Temperature Thermal Shutdown Hysteresis Output discharge resistor
RDS(ON),P RDS(ON),N L ILIM VENH VENL VUVLO VHYS FOSC TSS TSD THYS RDSC
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0.588 1.176 1.47 1.764 2.45 3.234 0.98
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陆海运河150 1.0 1.3 1.5 0.1 3 65 100 1 150 15 120Parameter Input Voltage Range Quiescent Current Shutdown Current Feedback Reference Voltage Output Voltage
Symbol VIN IQ ISHDN VREF VOUT
Test Conditions IOUT=0, VFB=VREF ⋅ 105% EN=0 SY98081 SY98081A SY98081B SY98081C SY98081D SY98081E SY98081F
Min 2.5
Typ 40 0.1 0.6 1.2 1.5 1.8 2.5 3.3 1.0 230
Max 5.5 1 0.612 1.224 1.53 1.836 2.55 3.366 1.02
Unit V µA µA V V V V V V V mΩ mΩ uH A V V V V MHz ns % ms °C °C Ω
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0.4 2.5
Note 2:
Note 3: The device is not guaranteed to function outside its operating conditions.
AN_SY98081/A/B/C/D/E/F Rev. 0.4 Silergy Corp. Confidential- Prepared for Customer Use Only
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Note 1: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Expo
sure to absolute maximum rating conditions for extended periods may affect device reliability.
θ JA is measured in the natural convection at TA = 25°C on a four-layer Silergy Evaluation Board.
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SY98081/A/B/C/D/E/F
Typical Performance Characteristics (SY98081C)
Efficiency vs. Load Current
95
Output Ripple
(VIN=5.0V,VOUT=1.8V, ILOAD=0A) VOUT(AC) 20mV/div
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85 VLX 2V/div
80
70 65 0.001 0.01
Load Current (A)
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Startup
(VIN=5.0V, VOUT=1.8V, ILOAD=0.6A) EN VOUT
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VLX IL 2V/div 2V/div VLX 5V/div IL 0.5A/div
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透水率(VIN=5.0V,VOUT=1.8V, ILOAD=0.6A) VOUT(AC) 20mV/div
(VIN=5.0V, VOUT=1.8V, ILOAD=0.6A)
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2V/div
VOUT 2V/div
VLX 5V/div
IL
0.5A/div
Time (2ms/div)
AN_SY98081/A/B/C/D/E/F Rev. 0.4 Silergy Corp. Confidential- Prepared for Customer Use Only
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VIN=3.3V,VOUT=1.8V VIN=4.2V,VOUT=1.8V VIN=5.0V,VOUT=1.8V
Time (4ms/div)
Output Ripple
0.5A/div
Time (400ns/div)
Shutdown
Time (200µs/div)
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