DatasheetsPDF.com

RT8204L Dataheets PDF



Part Number RT8204L
Manufacturers Richtek
Logo Richtek
Description Single Synchronous Buck Controller
Datasheet RT8204L DatasheetRT8204L Datasheet (PDF)

RT8204L Single Synchronous Buck Controller General Description The RT8204L PWM controller provides high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high voltage batteries to generate low voltage CPU core, I/O, and chipset RAM supplies in notebook computers. The constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant .

  RT8204L   RT8204L


Document
RT8204L Single Synchronous Buck Controller General Description The RT8204L PWM controller provides high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high voltage batteries to generate low voltage CPU core, I/O, and chipset RAM supplies in notebook computers. The constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. The RT8204L achieves high efficiency at a reduced cost by eliminating the current sense resistor found in traditional current mode PWMs. Efficiency is further enhanced by its ability to drive very large synchronous rectifier MOSFETs. The buck conversion allows this device to directly step down high voltage batteries for the highest possible efficiency. The RT8204L is intended for CPU core, chipset, DRAM, or other low voltage supplies as low as 0.75V. The RT8204L is available in a WQFN-16L 3x3 package. A built in LDO controller can drive an external N-MOSFET to provide a second output voltage from PWM output or other power source. The RT8204L can provide adjustable voltage down to 0.75V and maximum output voltage is dependen on the selected MOSFET. The internal 0.75V reference voltage with ±1.5% accuracy provides tight regulation of the output voltage. Other features such as independent enable control, open drain power good indicator, under voltage protection, and soft start make the RT8204L a system friendly power management solution for various applications. Features z PWM Controller Ultra High Efficiency ` Resistor Programmable Current Limit by Low Side RDS(ON) Sense (Lossless Limit) ` 4700ppm/°C RDS(ON) Current Sensing ` Quick Load Step Response within 100ns ` 1% VFB Accuracy Over Line and Load ` Adjustable 0.75V to 3.3V Output Range ` 4.5V to 26V Battery Input Range ` Resistor Programmable Frequency ` Integrated Bootstrap Switch ` Over/Under Voltage Protection ` Voltage Ramp Soft-Start ` Power Good Indicator LDO Controller ` 1.5% accuracy Over Line and Load ` Independent Enable and Power Good Indicator ` Drive N-MOSFETs within Rail to Rail Controller Voltage ` MLCC and POSCAP Stable RoHS Compliant and Halogen Free ` z z Applications z z z Notebook Computers CPU Core Supply Chipset/RAM Supply as Low as 0.75V Ordering Information RT8204L Package Type QW : WQFN-16L 3x3 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with Halogen Free and Pb free) Note : Richtek products are : ` RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. ` DS8204L-04 April 2011 www.richtek.com 1 RT8204L Marking Information RT8204LGQW J8= : Product Code YMDNN : Data Code Pin Configurations (TOP VIEW) TON EN/DEM LEN BOOT 16 15 14 13 J8=YM DNN VOUT VDD FB PGOOD 1 2 3 4 5 6 12 GND 17 7 8 11 10 9 UGATE PHASE OC VDDP J8 : Product Code J8 YM DNN YMDNN : Data Code WQFN-16L 3x3 Typical Application Circuit VIN 4.5V to 26V RTON RT8204L TON C4 C3 Q1 L1 R6* C5* R7 C6* C8 VOUT1 16 VDDP 5V BOOT 13 R4 R5 9 VDDP C1 R1 R2 UGATE 12 2 VDD C2 PHASE 11 LGATE 8 OC 10 RILIM Q2 PGOOD CCM/DEM LDO Enable LDO PGOOD R3 VDDP 4 PGOOD 15 EN/DEM 14 LEN 5 LPGOOD FB 3 R8 C7* VOUT 1 C14 VOUT2 R11 C10 C9 R12 C11* C12 C13 LDRV 7 R9 R10 Q3 17 (Exposed Pad) GND LFB 6 * : Optional www.richtek.com 2 LPGOOD LFB LDRV LGATE RT8204LZQW DS8204L-04 April 2011 RT8204L Function Block Diagram VOUT TON SS (Internal) TRIG On-time Compute 1-SHOT + + GM - + Comp R S Min. TOFF TRIG 1-SHOT DRV Diode Emulation Q DRV BOOT UGATE PHASE Q + OV 115% VREF FB 70% VREF Latch S1 Q Latch S1 Q - VDDP LGATE PGND + - UV 90% VREF VDD GND SS Ramp + Thermal Shutdown 20µA + - OC EN/DEM PGOOD LEN 0.75V VREF SS Ramp LFB 90% VREF + + - SS X1 LDRV LPGOOD 50% VREF + LDO Controller DS8204L-04 April 2011 www.richtek.com 3 RT8204L Functional Pin Description Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name VOUT VDD FB PGOOD LPGOOD LFB LDRV LGATE VDDP OC PHASE UGATE BOOT LEN Pin Function Output Voltage Sense Pin. Connect this pin to the output of the PWM converter. VOUT is an input of the PWM controller. Analog Supply Voltage Input for Internal Analog Integrated Circuit. Bypass this pin to GND with a 1μF ceramic capacitor. Feedback Input of PWM Controller. Connect FB to a resistive voltage divider from VOUT to GND to adjust the output voltage from 0.75V to 3.3V. Power Good Signal Open-Drain Output of PWM Controller. This pin will be pulled high when the output voltage is within the target range. Power Good Signal Open-Drain Output of the LDO Regulator. This pin will be pulled high when the output voltage is within the target range. Feedback Input of LDO Regulator. This pin will be pulled high when the output voltage is within the target range. Drive Signal for LDO’s Path MOSFET. Low Side N-MOS.


HDSP-E156 RT8204L MIC2951


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)