RT8802AGQV RICHTEK [Richtek Technology Corporation], RT8802AGQV Datasheet
RT8802AGQV
Related parts for RT8802AGQV
RT8802AGQV Summary of contents
Page 1
PWM Controller for High-Density Power Supply General Description The RT8802A is a 2/3/4/5-phase synchronous buck controller specifically designed to power Intel microprocessors. It implements an internal 8-bit DAC that is identified by VID code of microprocessor directly. RT8802A generates ...
Page 2
RT8802A Typical Application Circuit All brandname or trademark belong to their owner respectively www.richtek.com 2 TSEN PWM2 IOUT PWM1 QRSEL FB OFS COMP FBRTN SS VR_Ready TCOC VR_FAN IMAX VR_HOT RT VTT/EN ADJ DS8802A-04 August 2007 ...
Page 3
Functional Pin Description VTT/EN (Pin 1) The pin is defined as the chip enable, and the VTT is applied for internal VID pull high power and power sequence monitoring. VR_Ready (Pin 2) Power good open-drain output. FBRTN (Pin 3) Feedback ...
Page 4
RT8802A ISP1 (Pin 25), ISP2 (Pin 24), ISP3 (Pin 23), ISP4 (Pin 22), ISP5 (Pin 21) Current sense positive input pins for individual converter channel current sensing. PWM1 (Pin 26), PWM2 (Pin 27), PWM3 (Pin 28), PWM4 (Pin 29), PWM5 ...
Page 5
Table 1. Output Voltage Program (VRD10.x + VID6) VID4 VID3 VID2 ...
Page 6
RT8802A VID4 VID3 VID2 ...
Page 7
Table 1. Output Voltage Program (VRD10.x + VID6) VID4 VID3 VID2 ...
Page 8
RT8802A Table 1. Output Voltage Program (VRD10.x + VID6) VID4 VID3 VID2 ...
Page 9
Pin Name Nominal Output Voltage DACOUT HEX 00 OFF 01 OFF 02 1.60000V 03 1.59375V 04 1.58750V 05 1.58125V 06 1.57500V 07 1.56875V 08 1.56250V 09 1.55625V 0A 1.55000V 0B 1.54375V 0C 1.53750V 0D 1.53125V 0E 1.52500V 0F 1.51875V 10 ...
Page 10
RT8802A Pin Name Nominal Output Voltage DACOUT HEX 4E 1.12500V 4F 1.11875V 50 1.11250V 51 1.10625V 52 1.10000V 53 1.09375V 54 1.08750V 55 1.08125V 56 1.07500V 57 1.06875V 58 1.06250V 59 1.05625V 5A 1.05000V 5B 1.04375V 5C 1.03750V 5D 1.03125V ...
Page 11
Pin Name Nominal Output Voltage DACOUT HEX 9C 0.63750V 9D 0.63125V 9E 0.62500V 9F 0.61875V A0 0.61250V A1 0.60625V A2 0.60000V A3 0.59375V A4 0.58750V A5 0.58125V A6 0.57500V A7 0.56875V A8 0.56250V A9 0.55625V AA 0.55000V AB 0.54375V AC ...
Page 12
RT8802A Pin Name Nominal Output Voltage DACOUT HEX ...
Page 13
VID4 VID3 ...
Page 14
RT8802A VID5 VID4 VID3 ...
Page 15
VID5 VID4 VID3 ...
Page 16
RT8802A Absolute Maximum Ratings Supply Voltage, V ------------------------------------------------------------------------------------------- 7V DD Input, Output or I/O Voltage ---------------------------------------------------------------------------------- GND-0. Power Dissipation 25° VQFN−40L 6x6 -------------------------------------------------------------------------------------------------- 2.857W Package Thermal Resistance (Note 4) VQFN-40L 6x6, θ ...
Page 17
Parameter Reference and DAC DACOUT Voltage Accuracy DAC (VID0-VID125) Input Low DAC (VID0-VID125) Input High V Pull-up Resistance ID OFS Pin Voltage Error Amplifier DC Gain Gain-Bandwidth Product Slew Rate Current Sense GM Amplifier CSN Full Scale Source Current CSN ...
Page 18
RT8802A Typical Operating Characteristics Frequency vs. R 700 600 500 400 300 200 100 Output Voltage vs. Temperature 1.264 1.262 1.26 1.258 1.256 1.254 1.252 1.25 1.248 - Temperature (°C) ...
Page 19
Power On from VCC12 VCC12 (10V/Div) SS (1V/Div) V OUT (1V/Div) PHASE 3 (10V/Div) Time (1ms/Div) Power On from VCC5 VCC5 (5V/Div) SS (1V/Div) V OUT (1V/Div) PHASE 3 (10V/Div) Time (1ms/Div) Power On with OCP VR_Ready (1V/Div) SS (2V/Div) ...
Page 20
RT8802A V OUT V OUT (20mV/Div) I OUT (40A/Div) Time (2μs/Div) Dynamic VID V OUT (200mV/Div) VID0 (500mV/Div) Time (50μs/Div) VR_Ready (1V/Div) SS (2V/Div) FB (1V/Div) PWM (5V/Div) Time (10μs/Div) www.richtek.com 20 Droop (20mV/Div) (200mV/Div) (500mV/Div) OVP All brandname or ...
Page 21
Applications Information RT8802A is a multi-phase DC/DC controller specifically designed to deliver high quality power for next generation CPU. RT8802A controls a special power-on sequence & monitors the thermal condition of VR module to meet the VRD11 requirement. Phase currents ...
Page 22
RT8802A PWM4 V CORE VID7 Figure 2. Vcore Response at VID on the Fly DCR Current Sensing RT8802A adopts an innovative time-sharing DCR current sensing technique to sense the phase currents for phase current balance (phase thermal balance) and load ...
Page 23
I OFS 4 R FB1 V CORE V DAC Figure 4. Load Line and Offset Function Output Voltage Offset Function ® To meet Intel requirement of initial offset of load line, RT8802A provides programmable initial offset function. External resistor R ...
Page 24
RT8802A Current Ratio Function (A) OUT Figure 8 Current Balance Function ...
Page 25
For example, assuming the negative inductor current is = − load, then for I LX_50% R 330Ω 160Ω, V CSN ADJ OUT − × Ω 1. ≥ Ω R 330 CSN2 ≤ 85.8kΩ R ...
Page 26
RT8802A OCP Comparator + - Figure 16. Over Current Comparator Phase current OCP and total current OCP with thermal compensation ∝ V-comparator I X( Phase - OC V-comparator ...
Page 27
Temperature coefficient compensation(TSEN external resister & thermistor, resistor between ADJ and GND.) Power Sequence & SS DVD pin external resistor and SS pin capacitor. PCB Layout a.Kelvin sense for current sense GM amplifier input. b.Refer to layout guide for ...
Page 28
RT8802A Outline Dimension D A Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 www.richtek.com ...