GS7210A-ATQ-R

NIKO-SEM GStek series High Performance Single Synchronous Buck Controller with Reference Input Features GS7210A General Description The GS7210A is small size chip with a relative Rectified Bridge constant on-time synchronous buck switching Adjustable Relative Constant on-time for fast controller suitable for applications in notebook dynamic response computers and other battery operated devices.  Programmable VOUT range The GS7210A has a unique power save mode,  VIN range = 3V~28V which can save battery power supply by  Support Internal Reference Voltage and decreasing frequency when load current falls External Reference Voltage down below preset critical current point.  Wide Output Load Range: 0 to 20A+ The fast dynamic transient response means that  1% reference accuracy over load and line buck converter applications based on GS7210A  Low voltage DC current sense using low-side will provide about 100ns-order response to load RDS (ON) Sensing or sense resistor when output voltage falls down or rises up. The  Resistor programmable frequency frequency will increase or decrease to meet the  Built-in Bootstrap Diode change in output load. Moreover, the GS7210A  Cycle-by-cycle current limit will take the same method to regulate the output  4-Step Current Limit During Soft-start voltage when input voltage changes. When  Over-voltage/under-voltage fault protection transient response regulated, the controller will  Low quiescent power dissipation maintain a new steady-state operation. Both the  Power good indicator/ Power save option transient response state and the new state, the  Integrated gate drivers with fast transmission GS7210A always has the same on-time. scheme The GS7210A supports internal 0.6V reference  Over temperature protection(Non-Latch) voltage and external reference from 0.4V to 3.0V  TQFN16-3x3 package for internal error amplifier. When the chip works  Green Product (RoHS, Lead-Free, external reference mode, it can deliver output Halogen-Free Compliant) voltage as low as 0.4V.      Dual MOSFET Drivers for Synchronous  An external setting resistor and output voltage Applications can set the on-time, duty-cycle and frequency for Notebook computers the controller. The integrated gate drivers feature  CPU core/IO Supplies adaptive shoot-through protection, fast signal  Chip/RAM Supplies transmission. Additional features include current    limit, soft-start, over-voltage and under-voltage protection and a Power Good flag. The GS7210A is available in package TQFN16-3x3. This document is NIKO-SEM's confidential information. Anyone having confidential obligation to NIKO-SEM shall keep this document confidential. Any unauthorized disclosure or use beyond authorized purpose will be considered as violation of confidentiality and criminal and civil liability will be asserted. Rev.:0.6 (Preliminary Specification) GStek series 1 Aug-12 NIKO-SEM GStek series High Performance Single Synchronous Buck Controller with Reference Input GS7210A   Typical Application Figure 1a Typical Application of GS7210A: VIN=8V, ILOAD=18A VIN 8V RTon EN Optional (Note 6) VOUT RVO1 RVO2 R1 R2 RPGOOD 15 14 13 CBT BOOT 1 VOUT UGATE 12 2 VDD PHASE 11 3 FB OCSET 10 4 PGOOD VDDP 9 GS7210A L1 VOUT COUT RCS   16 TON EN/MD NC REFIN GND PGND LGATE 5 6 7 8 REFIN   VDD5V Figure 1b Typical Application of GS7210A: VIN=8V, ILOAD=18A Rev.:0.6 (Preliminary Specification) GStek series 2 Aug-12 High Performance Single Synchronous Buck Controller with Reference Input NIKO-SEM GStek series GS7210A   Function Block Diagram Figure 2 Function Block Diagram Pin Configuration 15 14 13 13 1 12 2 11 3 10 4 9 5 6 7 9 12 8 GStek 7210A ZZMD   16 16 8 5 1   Figure3 TQFN16-3x3Package ( Top view ) Rev.:0.6 (Preliminary Specification) GStek series 3 Aug-12 NIKO-SEM GStek series High Performance Single Synchronous Buck Controller with Reference Input GS7210A Pin Descriptions Name I/O type Pin Function 1 VOUT I Buck Output Voltage (0~2.5V) Sense Input. Control the inner TON Time. 2 VDD I Power Supply for Analog and Digital circuits of the chip. Use a 1uF Ceramic capacitor to bypass to GND. 3 FB I Buck Output Voltage Feedback Input. Used to control output voltage range through a resistor voltage divider. 4 PGOOD I/O 5 REFIN I 6,17 GND O 7 PGND O 8 LGATE O 9 VDDP I 10 OCSET I 11 PHASE I 12 UGATE O 13 BOOT I 14 NC 15 EN/MD I 16 TON I Buck controller power good indicator. Internal open drain structure. Connect to an external pull-up resistor. This pin will be pulled high when output voltage reaches to the target range. External Reference Voltage Input. This pin supports the reference voltage from 0.4V to 3.0V as the non-inverting input of the error amplifier. Pulling this pin lower than 0.3V disables the controller. Float this pin for internal 0.6V reference. Analog and Digital Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. The Power Ground for the driver circuits of the chip Lower gate drive output for Buck Controller. Connect to gate of low-side power MOS FET. Power Supply for the driver circuits of the chip. Use a 1uF Ceramic capacitor to bypass to GND. Current-Limit setting Input Pin for Buck Controller. Connect to PHASE pin though an external resistor to set the current limit threshold. Upper Driver Floating Ground for Buck Controller. Connect to an external Inductor. It is used to sense current of the inductor. Upper gate drive output for Buck Controller. Connect to gate of high-side power MOS FET. UGATE Driver Power Supply for Buck Controller. Bootstrap voltage pin. Use a ceramic capacitor connecting to the external diode with this pin. Useless     Buck Enable Control Pin. EN=Low, Shutdown; EN=High, PWM work in DEM MODE, EN=Floating or 2V, PWM work in CCM MODE. Inner Ton Time Control Pin for Buck Controller, Connect an external pull up resistor to VIN. Rev.:0.6 (Preliminary Specification) GStek series 4 Aug-12   No. NIKO-SEM GStek series High Performance Single Synchronous Buck Controller with Reference Input GS7210A Ordering Information GS7210A PP-R 1. Product name 3. Shipping 2. Package No Item Contents 1 Product name 2 Package TQ: TQFN16-3x3 3 Shipping R: Tape & Reel GS7210A   Example: GS7210A TQFN16-3x3 Tape & Reel ordering information is “GS7210A-TQ-R” Absolute Maximum Rating (Note 1) Parameter Symbol Limits Units VIN to GND VIN -0.3 ~ 30 V TON to GND VTON -0.3 ~ 30 V OCSET to GND VOC -0.3 ~ 40 V VSUPPLY -0.3 ~ 6 V -0.3 ~ 6 V VBOOT-GND -0.3 ~ 45 V VBOOT-PHASE -0.3 ~ 6 V VGL -0.3 ~ 6 V VPHASE -2 ~ 40 V PD_TQFN16-3x3 1471 mW Junction Temperature TJ - 45 ~ 150 °C Storage Temperature TSTG - 55 ~ 150 °C Lead Temperature (Soldering) 10S TLEAD 260 °C ESD (Human Body Mode) (Note 2) VESD_HBM 2K V VESD_MM 200 V Symbol Limits Units θJA_TQFN16-3x3 68 °C/W VDD, VDDP to GND PGOOD, FB, EN, REFIN to GND BOOT Voltage BOOT to PHASE Voltage LGATE to GND PHASE to GND Package Power Dissipation at TA≦25°C ESD (Machine Mode) (Note 2)     GND - 8V (