GS9238TQ-R

NIKO-SEM GStek series High Performance Single Synchronous Buck Converter Features GS9238 General Description  Wide Output Current Range：8A The GS9238 is small size chip with a relative  Wide Input Voltage Range：3V~28V constant on-time synchronous buck switching  Adjustable 0.8V~20V Output Range converter suitable for applications in notebook  ±1% Output Voltage Accuracy over Line and computers and other battery operated portable Load devices. Features include wide input voltage Constant-on-time control scheme for fast range, high efficiency and fast dynamic response transient and high Efficiency The GS9238 has a unique power save mode, Programmable Operation Frequency from which can save battery power supply by 100kHz to 600kHz decreasing frequency when load current falls Integrated 20 mΩ at LDO=5V N-Channel down below preset critical current point. MOSFET For High Side The fast dynamic transient response means that Integrated 9.5 mΩ at LDO=5V N-Channel buck converter applications based on GS9238 MOSFET For Low Side will provide about 100ns-order response to load Selectable Forced PWM or automatic when output voltage falls down or rises up. The PFM/PWM mode frequency will increase or decrease to meet the  Power Good Indicator change in output load. Moreover, the GS9238 will  Under-Voltage Protection take the same method to regulate the output  Over-Voltage Protection voltage when input voltage changes. When  FB Short Protection transient response regulated, the converter will  Internal 5V Pre-regulator maintain a new steady-state operation. Both the  External Adjustable Soft-Start and Soft-Stop transient response state and the new state, the  Over Temperature Protection GS9238 always has the same on-time width.  Over Current Protection The GS9238 is suitable for the solutions which  TQFN23-4x4 package the output voltage is between 0.8V and 20V. An  Green Product (RoHS, Lead-Free, external setting resistor and output voltage can Halogen-Free Compliant) set the on-time width and frequency for the      converter. Additional features include current limit, Applications soft-start, over-voltage and under-voltage  Notebook computers protection, a Power Good flag and soft discharge  CPU core/IO Supplies upon shutdown. The GS9238 is available in  Chip/RAM Supplies package TQFN23-4x4. 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.:1P8 GStek series 1 Feb-17 High Performance Single Synchronous Buck Converter NIKO-SEM GStek series GS9238 Typical Application 4.5V~5.5V RPOK AIN CLDO VIN VCC RTON GS9238 PGOOD CBOOT L1 LX PFM Coption FB RFB2 CVOUT AGND SS CSS VOUT RFB1 EN OFF CVIN TON BOOT ON VIN PGND Figure 1a Typical Application of GS9238 AIN CLDO VIN VCC BOOT GS9238 PGOOD LX EN OFF PFM CSS SS RTON CVIN TON RPOK ON VIN FB CBOOT L1 VOUT RFB1 Coption RFB2 CVOUT AGND PGND Figure 1b Typical Application of GS9238 Rev.:1P8 GStek series 2 Feb-17 High Performance Single Synchronous Buck Converter NIKO-SEM GStek series GS9238 Function Block Diagram PGOOD AIN VCC SS BOOT VIN 1 7 21 23 20 8, 9, 22 Pre Reg Bandgap EN 2 Enable Soft Start Vref=0.8V LDO UVLO VCC UVLO High Side MOS DRV LX TON 10,11, 16~18 TON Generator 6 Error AMP 1V 0.36V OVP Low Side MOS DRV Protection Logic Error AMP UVP OCP Error AMP 0.8V GM Gate Control Logic PWM CMP 5 4 3 12~15, 19 FB AGND PFM PGND Figure 2 Function Block Diagram Rev.:1P8 GStek series 3 Feb-17 High Performance Single Synchronous Buck Converter NIKO-SEM GStek series GS9238 Pin Configuration SS 23 VIN 22 VCC BOOT PGND LX 18 19 20 21 17 LX PGOOD 1 EN 2 PFM 3 24 25 VIN LX 16 LX 15 PGND AGND 4 14 PGND FB 5 13 PGND TON 6 12 PGND 7 8 AIN 9 VIN VIN 10 11 LX LX ( Top view ) Figure 3 TQFN23-4x4 Package Pin Descriptions No. Name I/O 1 PGOOD O 2 EN I Description Power Good Signal Output. PGOOD is an open-drain output used to indicate the status of the output voltage. Buck Enable Control Pin. EN=Low, Shutdown; EN=High, Power On. PFM Selection Input. Connect PFM pin to VCC/VIN for 3 PFM I forced PWM operation. Connect PFM to ground for PFM operation. 4 AGND O 5 FB I 6 TON I 7 AIN I Rev.:1P8 GStek series Analog Ground Feedback Input. Adjust the output voltage with a resistive voltage-divider between the regulator’s output and AGND. On-Time Setting Input. Connect a resistor between VIN and TON to set the on time width. Supply Input for internal analog circuitry. 4 Feb-17 High Performance Single Synchronous Buck Converter NIKO-SEM GStek series 8, 9, 22, 24 VIN I 10, 11, 16, 17,18, 25 LX I/O 12,13, 14, 15, 19 PGND O 20 BOOT I 21 VCC O 23 SS I/O GS9238 Supply Input. VIN is the regulator input. All VIN pins must be connected together. Upper Driver Floating Ground for Buck Controller. Connect to an external inductor. Power Ground. Bootstrap Capacitor Connection. Connect a capacitor between BOOT and LX Pin. Internal Linear Regulator Output. Soft-Start Time Setting Pin. Connect a capacitor between SS and AGND to set the soft-start time. Ordering Information GS9238TQ-R 1. Package 2. Shipping No Item Contents 1 Package TQ: TQFN23-4x4 2 Shipping R: Tape & Reel Example: GS9238 TQFN23-4x4 Tape & Reel ordering information is “GS9238TQ-R” Rev.:1P8 GStek series 5 Feb-17 NIKO-SEM GStek series High Performance Single Synchronous Buck Converter GS9238 Absolute Maximum Rating (Note 1) Parameter Symbol Limits Units VIN, VAIN -0.3 ~ 30 V VTON -0.3 ~ 30 V VCC, VPG to GND VCC, VPG -0.3 ~ 6 V EN/PFM to GND VEN, VPFM -0.3 ~ 30 V VFB -0.3 ~ 6 V VBOOT-GND -0.3 ~ 40 V VBOOT-LX -0.3 ~ 6 V VIN, AIN to GND TON to GND FB to GND BOOT Voltage BOOT to LX Voltage LX to GND DC VLX 125%, VPG go to Low VFB>90%, VPG go to High PG debounce time 7 V 1 uA 125 % 90 % 20 us Feb-17 NIKO-SEM GStek series High Performance Single Synchronous Buck Converter GS9238 Current Parameters Quiescent Current IQ VFB =0.85V, VIN=12V 870 uA Soft start current ISS VSS=0 10 uA VEN =0, I(AIN) 4 uA Shutdown Current ISHTDN VEN =0, I(TON) VEN =0, I(EN) Logic Input Current FB Input Bias Current 0.01 -2 IEN VAIN= VEN=12V IFB FB=0.8V -0.1 uA -1 uA 13 uA 0.001 0.1 uA System Time & Driver On-Resistance On-Time Minimum Off-Time High Side MOS RDSON High Side Leakage Low Side MOS RDSON Low Side Leakage TON TOFFMIN RDSH VIN=12V,VFB=0.79V, RTON=100K,VOUT=1.2V VIN=12V, VFB=0.79V, RTON=100K BOOT-LX=5V ILEAKH RDSL VCC-GND=5V ILEAKL 300 ns 440 ns 20 mohms 10 uA 9.5 mohms 10 uA Current Sensing Current ILIM GND-LX 8 VT_0 GND-LX -10 Limit(Rising) Zero Crossing Threshold A 10 mV Voltage Fault Protection Measure at VFB, with UVP Threshold VUV_TH respect to reference 45 % voltage From Enable to UVP UVP Blank Time TUV_B 80mV