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RT5021 数据表(PDF) 66 Page - Richtek Technology Corporation |
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RT5021 数据表(HTML) 66 Page - Richtek Technology Corporation |
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66 / 67 page  RT5021 66 DS5021-01 April 2013 www.richtek.com Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. © Protection Type Threshold (Typical) Refer to Electrical Spec. Protection Methods PMU Shutdown Delay Time Reset Method Current limit P-MOSFET peak current > 1.8A N-MOSFET off, P-MOSFET off. Automatic reset at next clock cycle. 100ms VDDI power reset or EN1234 pin set to low FB4 UVP FB4 < 0.4V after soft-start end. N-MOSFET off, P-MOSFET off. No-delay VDDI power reset or EN1234 pin set to low CH4 Step-Down FB4 Over Load Target − 0.1V (Target voltage is the chosen one in A5.FB4 [2:0]) PMU Shutdown when OL occur each cycle until 100ms. 100ms VDDI power reset or EN1234 pin set to low Current limit P-MOSFET peak current > 1.5A N-MOSFET off, P-MOSFET off. Automatic reset at next clock cycle. 100ms VDDI power reset or EN1234 pin set to low VO5 UVP PVD5 UVP : FB5 < 0.4V after soft-start end N-MOSFET off, P-MOSFET off. No-delay VDDI power reset or EN1234 pin set to low Target voltage is the chosen one in A6.VOUT5 [3:0] = 0000 (FB5 = 0.8V) Target voltage is the chosen one in A6.VOUT5 [3:0] = 0001 to 0111 CH5 Step-Down VO5 Over Load Target voltage is the chosen one in A6.VOUT5 [3:0] = 0111 to 1111 PMU Shutdown when OL occur each cycle until 100ms. 100ms VDDI power reset or EN1234 pin set to low CH6 LDO Max. output current (current limit) P-MOSFET current > 0.45A (PVD6 = 1.5V, VO6 = 1.3V) P-MOSFET off. 100ms VDDI power reset or EN1234 pin set to low Current limit (Step-Up mode) N-MOSFET current > 0.8A N-MOSFET off, P-MOSFET off. Automatic reset at next clock cycle. 100ms VDDI power reset or EN1234 pin set to low PVDD7 > 16V (A0.OVP7 = 0) CH7 WLED PVDD7 OVP PVDD7 > 25V (A0.OVP7 = 1) N-MOSFET off, P-MOSFET off. Shutdown CH7 by self No-delay VDDI power reset and A2.EN7_DIM7 [4:0] reset or EN1234 pin set to low CH8 LDO Max. output current (current limit) P-MOSFET current > 0.45A (PVD6 = 3V, VO6 = 2.5V) P-MOSFET off. 100ms VDDI power reset or EN1234 pin set to low Thermal Thermal shutdown Temperature > 155 °C All channels stop switching No-delay Temperature < (155 − 20)°C VIN UVLO VIN < 3.3V No-charge No-delay No latch VIN VIN OVP VIN > 6.5V No-charge No-delay No latch |
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