STI8070A

STI8070A 5A ,2.1MHz,I2C Programmable Synchronous Buck Converter FEATURES            GENERAL DESCRIPTION Compatible I2C Interface Up to 3.4MHz Input Voltage Range :2.5~5.5V Up to 5A Output Current Mode Selection Between PFM and PWM at Light Load Typical 50uA Quiescent Current in Light Load PFM Mode 2.1MHz Switching Frequency Integrated Soft-Start Input UVLO and OVP Build in Thermal Shutdown and OCP 0.25uH Inductor Support Compact WLCSP-20 Package APPLICATIONS    Smart Phones DSP or CPUs Processors Tablet, MID STI8070A is an I2C Programmable, high efficiency,2.1MHz, Synchronous Buck converter that operates in wide input voltage range from 2.5V to 5.5V. The output Voltage could be programmed from 0.72V to 1.5V. Very low standby current ensure high efficiency in light load PFM mode. The forced PWM mode could be set to avoid application problems caused by low switching frequency. A COT(Constant On-Time) structure is adaptive to achieve the fixed switching frequency and fast load transient response. STI8070A provides up to 5A output current with Integrated 28 mΩ(high side) and 18 mΩ(low side) power switch. STI8070A also implement a internal soft-start and cycle-by-cycle over current protection function. In addition, the input UVLO and OVP protection, Thermal shutdown protection. APPILCATIONS Figure 1. Basic Application Circuit TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 2017.09 www.toll-semi.com www.suntosemi.com 1 STI8070A ABSOLUTE MAXIMUM RATINGS (Note 1) Parameter Value Unit ALL Voltage Range -0.3~6.5 V Junction Temperature(Note2) -40~150 °C Storage Temperature -65~150 °C Junction-to-ambient Thermal Resistance 38 °C/W Junction-to-case Thermal Resistance 9 °C/W Power Dissipation 2.6 W PACKAGE/ORDER INFORMATION 1 2 3 4 A SEL EN SCK OUT B SDA PGND PGND AGND C PGND PGND PGND PGND D IN IN SW SW E IN IN SW SW WLCSP-20 Top Mark: S70AXX (S70A: Device Code, XX: Inside Code) Part Number STI8070A www.toll-semi.com 2 www.suntosemi.com Package WLCSP-20 Top mark Quantity/ Reel S70AXX 3000 TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 2017.09 STI8070A PIN DESCRIPTIONS Pin Name A1 SEL Voltage select pin, 0: VSEL0 register, 1: VSEL1 register A2 EN Enable pin, 0: Shut down, 1: Enable A3 SCK I2C Clock pin A4 OUT Output voltage sense pin, Connect to output capacitor B1 SDA I2C Data pin B2~B3 C1~C4 B4 PGND Power Ground pins AGND Analog Ground pin D1~B2 IN Power input pin, Connect to input capacitor SW Switching Pin, Connect to external Inductor E1~E2 D3~B4 E3~E4 Function ESD RATING Items Description Value Unit VESD Human Body Model for all pins ±2000 V JEDEC specification JS-001 RECOMMENDED OPERATING CONDITIONS Items Description Min Voltage Range IN 2.5 5.5 V TA Operating Temperature Range -40 85 °C TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 2017.09 www.toll-semi.com Max Unit www.suntosemi.com 3 STI8070A ELECTRICAL CHARACTERISTICS (Note 3) ( VIN=3.6V , VOUT=1V TA = 25°C, unless otherwise noted.) Parameter Input Voltage Range Under Voltage Lockout UVLO Hysteresis Symbol VIN VUVLO Min Typ 2.5 Vin rising VUVLO_HY Unit 5.5 V 2.45 V 100 mV 6.15 V VINOVP Input OVP Hysteresis VOVP_HY 400 mV OVP blank time TOVP_BT 20 uS 50 uA IIN ISDN Input Shutdown current ISDI2C EN/SDA/SCK/MODE Logic high Threshold EN/SDA/SCK/MODE Logic low Threshold PFET peak Current limit Switch On-Resistance Vin rising Max Input OVP Voltage Input Supply Current EN=1, Iload=0, Vout>105%*Vset EN=”0” I2C set shutdown EN=1 VINH 0.1 1 uA 20 30 uA 1.1 V VINL 0.4 ILIM_MAX V 6.7 A RDSONH 28 mΩ RDSONL 18 mΩ Switching Frequency Fosc 2.1 MHz Minimum Turn-on Time TON_MIN 52 nS Soft-start Time Tsst 300 uS Thermal Shutdown Threshold TSDN 163 ℃ Thermal Shutdown Hysteresis TSDN_HY 133 ℃ (high side) Switch On-Resistance (low side) www.toll-semi.com 4 Test Conditions www.suntosemi.com rising TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 2017.09 STI8070A Typical Characteristics Efficiency vs. Load Current VOUT=1.05V Efficiency vs. Load Current VOUT=1.2V 91.00% 2.7VIN 86.00% 3.6VIN 81.00% 5.0VIN Efficiency Efficiency 91.00% 76.00% 2.7VIN 86.00% 3.6VIN 81.00% 5.0VIN 76.00% 0 2 4 0 Efficiency vs. Load Current Efficiency vs. Load Current Output Voltage vs. Load Current VOUT=1.05V Frequency vs. Load Current VOUT=1.05V 1.06 1.055 1.05 1.045 1.04 1.035 1.03 2.6VIN 3.6VIN 5.0VIN 0 2 4 Load Current (A) 2500 2000 IOUT=0.0A IOUT=0.1A IOUT=3.0A 1.035 1.03 2.6 3.6 4.6 5.6 Input Voltge (V) Input Voltage vs. Output Voltage TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 2017.09 Load Current (mA) 1.055 1.04 5.0VIN 500 0 -500 0 2 4 Load Current (A) PFM Entry/Exit Level vs. Input Voltage VOUT=1.05V 1.06 1.045 3.6VIN 1000 Frequency vs. Load Current Input Voltage vs. Output Voltage 1.05 2.6VIN 1500 Load Current vs. Output Voltage Ouput Voltage (V) 4 Load Current (A) Switching Frequency (kHz) Output Voltage (V) Load Current (A) 2 1.5 PFM Exit 1 PFM Entry 0.5 0 2.5 3 3.5 4 4.5 5 5.5 Input Voltge (V) PFM Entry/Exit Level vs. Input Voltage www.toll-semi.com www.suntosemi.com 5 STI8070A 50 45 40 35 30 2.5 3.5 4.5 Input Voltage (V) Standby Current Vs Input Voltage VIN=5V, IOUT=0.1A Ripple Waveform VIN=5V, IOUT=0.5A Ripple Waveform www.toll-semi.com 6 www.suntosemi.com 5.5 Output Ripple (mV) Standby Current (uA) Vin Standby Current at IOUT=0A Output Ripple vs. Load Current VOUT=1.05V 60 40 3.6VIN 5.0VIN 20 0 0 2 4 Load Current (A) Output Ripple vs. Load Current VIN=5V, IOUT=1.0A Ripple Waveform VIN=5V, IOUT=3.0A Ripple Waveform TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 2017.09 STI8070A VIN=5V, IOUT=5.0A Ripple Waveform VIN=3.6V, IOUT=3.0A Ripple Waveform VIN=3.6V, IOUT=0.1A Ripple Waveform VIN=3.6V, IOUT=5.0A Ripple Waveform VIN=3.6V, IOUT=0.6A Ripple Waveform TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 2017.09 VIN=3.6V, IOUT=1.0A Ripple Waveform www.toll-semi.com www.suntosemi.com 7 STI8070A Soft-Start WaveformVIN=2.6V，IOUT=0 Soft-Start Waveform VIN=5.0V，IOUT=0 Load Transient from 0.3A to 3A Load Transient from 3A to 0.3A FUNCTIONAL DESCRIPTION Enable EN Pin controls chip start. Also STI8070A allows software to enable converter by I2C interface, BUCK_EN0 and BUCK_EN1 bits. The true table is showed as below. Pins Bits EN SEL BUCK_EN0 BUCK_EN1 OUTPUT 0 x x x OFF 1 0 0 x OFF 1 0 1 x ON 1 1 x 0 OFF 1 1 x 1 ON I2C Timing STI8070A allows the HOST to set the output voltage or other configurable function using an I2C compatible interface and STI8070A always operates as a SLAVE device. The I 2C www.toll-semi.com 8 www.suntosemi.com TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 2017.09 STI8070A interface supports CLK frequency up to 3.4MHz and all data is transmitted with MSB(bit 7) first. In hex form, the address of STI8070A is 0x80. STI8070A is addressed using a 7-bit address followed by a direction bit. If the direction bit is 1, the HOST reads data from STI8070A and if the direction bit is 0, the HOST writes data to STI8070A. A transaction begins with a START condition which is a HIGH to LOW transition of the SDA line while the SCL is HIGH. A transaction ends with a STOP condition which is a LOW to HIGH transition of the SDA line while the SCL is HIGH. The data on the SDA line must stay unchanged when the SCL line is HIGH and vary only when the SCL is LOW, otherwise, STI8070A will consider it as a START or STOP condition. Each transaction contains nine clock pulses. During the ninth pulse, if the SDA line is pulled LOW by STI8070A, it is defined as an acknowledge(ACK) bit, otherwise, it is defined as an NO ACK bit. SCL SDA VALID DATA START DATA CHANGE ACKNOWLEDGE FROM SLAVE STOP Write period When the master needs to write data to STI8070A, it generates a START condition followed by the 7-bit address 0x80 and the direction bit 0, STI8070A then acknowledges by pulling SDA LOW during the ninth pulse; the master then transmits register address and the data it needs to write, the operation ends with a STOP condition. S SlAVE ADDRESS+W A REGISTER ADDRESS A DATA A P Read period When the master needs to read data from STI8070A, it generate a START condition followed by the 7-bit address 0x80 and the direction bit 0, the master then transmit register address it needs to read from; after STI8070A acknowledges to the operation, the master issues a START condition again, followed by the 7-bit address 0x80 but the direction bit is modified to 1; the STI8070A then acknowledges and shifts out the data to the master, the master gives NO ACK and ends the operation with a STOP condition. S SlAVE ADDRESS+W A REGISTER ADDRESS S SlAVE ADDRESS+R DRIVEN BY THE MASTER S START A ACKNOWLEDGE DRIVEN BY THE SLAVE P STOP N NO ACKNOWLEDGE TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 A 2017.09 A DATA www.toll-semi.com N P www.suntosemi.com 9 STI8070A I2C device Address: 0x80, 1、VSEL0(0x00) Field Bit R/W Default Description Software buck enable. When EN pin is low, the BUCK_EN0 7 R/W 1 regulator is off. When EN pin is high, BUCK_EN bit takes precedent. MODE0 6 R/W 0 0=Allow auto-PFM mode during light load. 1=Forced PWM mode 000000 = 0.7200V 000001 = 0.7325V VSEL0 5:0 R/W 010111(Vout=1V) (0.720+n*0.0125) 000010 = 0.7450V …… 010111 = 1.0000V …… 111111 = 1.5000V 2、VSEL1(0x01) Field Bit R/W Default Description Software buck enable. When EN pin is low, the BUCK_EN1 7 R/W 1 regulator is off. When EN pin is high, BUCK_EN bit takes precedent. MODE1 6 R/W 0 0=Allow auto-PFM mode during light load. 1=Forced PWM mode 000000 = 0.7200V 000001 = 0.7325V VSEL1 5:0 R/W 010111(Vout=1V) (0.720+n*0.0125) 000010 = 0.7450V …… 010111 = 1.0000V …… 111111 = 1.5000V www.toll-semi.com 10 www.suntosemi.com TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 2017.09 STI8070A 3、Control Register(0x02) Field Bit R/W Default 7 R/W 1 Output Discharge Description 0 = discharge resistor is disabled. 1 = discharge resistor is enabled. Set the slew rate for positive voltage transitions. 000 = 10mV/0.15us 001 = 10mV/0.3us 010 = 10mV/0.6us Slew Rate 6:4 R/W 000(10mV/0.15uS) 011 = 10mV/1.2us 100 = 10mV/2.4us 101 = 10mV/4.8us 110 = 10mV/9.6us 111 = 10mV/19.2us reserved 3 R/W 0 Always reads back 0 Reset 2 R/W 0 Setting to 1 resets all registers to default values. reserved 1:0 R/W 00 Always reads back 0 4、ID1 Register(0x03) Field Bit R/W Default VENDOR 7:5 R 101 reserved 4 R 0 DIE_ID 3:0 R 1101 Description IC vendor code. Always reads back 0 IC option code 5、ID2 Register(0x04) Field Bit R/W Default Description reserved 7:4 R 0000 Always Reads back 0 DIE_REV 3:0 R 0001 IC mask revision code 6、PGOOD Register(0x05) Field Bit R/W Default PGOOD 7 R 0 reserved 6:0 R 000000 TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 2017.09 Description 1: Buck is enabled and soft-start is completed. Always reads back 0 www.toll-semi.com www.suntosemi.com 11 STI8070A PACKAGE INFORMATION WLCSP-20 Note: 1) All dimensions are in millimeters. 2) Package length does not include mold flash, protrusion or gate burr. 3) Package width does not include inter lead flash or protrusion. 4) Lead popularity (bottom of leads after forming) shall be 0.10 millimeters max. 5) Pin 1 is lower left pin when reading top mark from left to right. www.toll-semi.com 12 www.suntosemi.com TMI and SUNTO are the brands of TOLL microelectronic STI8070A V1.8 2017.09