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RT2855BHGQW Datasheet(PDF) 9 Page - Richtek Technology Corporation |
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RT2855BHGQW Datasheet(HTML) 9 Page - Richtek Technology Corporation |
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9 / 16 page  RT2855A/B 9 DS2855A/B-01 September 2015 www.richtek.com © Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect device reliability. Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is measured at the exposed pad of the package. Note 3. The device is not guaranteed to function outside its operating conditions. Parameter Symbol Test Conditions Min Typ Max Unit RDS(ON) Switch On Resistance High Side RDS(ON)_H TA = 25C (VBOOT VSW) = 5.5V -- 70 -- m Low Side RDS(ON)_L TA = 25C -- 30 -- Current Limit Current Limit ILIM 5 6 7 A Thermal Shutdown Thermal Shutdown Threshold TSD Shutdown Temperature -- 150 -- C Thermal Shutdown Hysteresis TSD -- 20 -- On-Time Timer Control On-Time tON VIN = 12V, VOUT = 1.05V -- 135 -- ns Minimum Off-Time tOFF(MIN) VFB = 0.7V, TA = 25C -- 260 310 ns Soft-Start SS Charge Current VSS = 0V 5 6 7.5 A SS Discharge Current VSS = 0.5V (Latch Mode) 0.1 0.2 -- mA VSS = 0.5V (Hiccup Mode) -- 0.5 -- A UVLO UVLO Threshold Wake Up VREG5 3.6 3.85 4.1 V Hysteresis 0.18 0.35 0.47 Power Good PGOOD Threshold VFB Rising 85 90 95 % VFB Falling -- 85 -- PGOOD Sink Current PGOOD = 0.5V 2.5 5 -- mA Output Under Voltage and Over Voltage Protection OVP Trip Threshold OVP Detect 114 120 126 % OVP Prop Delay -- 5 -- s UVP Trip Threshold 65 70 75 % UVP Hysteresis -- 10 -- UVP Prop Delay -- 250 -- s UVP Enable Delay tUVPEN Relative to Soft-Start Time -- tSS x 1.7 -- ms |
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