eup3284hwir1 3A30V DC-DC降压芯片方案_骊微电子.pdf

EUP3284H 3A, 30V, 340KHz Synchronous Step-Down Converter DESCRIPTION The EUP3284H is a synchronous current mode buck regulator capable of driving 3A continuous load current with excellent line and load regulation. The EUP3284H can operate with an input range 4.5V to 30V and the output can be externally set from 0.92V to 20V with a resistor divider. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. In shutdown mode the regulator draws 3A of supply current. Programmable soft-start minimizes the inrush supply current and the output overshoot at initial startup. Automatic pulse skipping mode operation increase efficiency at light loads. The EUP3284H require a minimum number of external components. Typical Application Circuit FEATURES ?3A Output Current ?Automatic Pulse Skipping Mode at Light Load ?Integrated 142m/103m DMOS Switches ?4.5V to 30V Input Operating Range ?Output Adjustable from 0.92V to 20V ?Up to 94% Efficiency ?3A Shutdown Current ?Fixed 340KHz Frequency ?Programmable Soft-Start ?Thermal Shutdown and Overcurrent Protection ?Input Supply Undervoltage Lockout ?220ns Minimum On Time ?Available in SOP-8 (EP) Package ?RoHS Compliant and 100% Lead(Pb)-Free Halogen-Free APPLICATIONS ?Distributed Power Systems ?Networking Systems ?PC Monitors ?Portable Electronics Figure 1. 12V to 3.3V/5V Application Circuit 深圳市骊微电子科技有限公司w w w .s z l w t e ch .co m德信代理商EUP3284H Typical Operating Characteristics(See Figure1, C1=10F, C2=22F2, L=10H, TA=+25C) 深圳市骊微电子科技有限公司w w w .s z l w t e ch .co m德信代理商EUP3284H Typical Operating Characteristics (continued)(See Figure1, C1=10F, C2=22F2, L=10H, TA=+25C) 深圳市骊微电子科技有限公司w w w .s z l w t e ch .co m德信代理商EUP3284H Packaging Information SOP-8 (EP) Remark: Exposed pad outline drawing is for reference only. MILLIMETERS INCHES SYMBOLS MIN. Normal MAX. MIN. Normal MAX. A 1.35 - 1.75 0.053 - 0.069 A1 0.00 - 0.25 0.000 - 0.010 D 4.80 4.90 5.00 0.189 0.193 0.197 E1 3.70 3.90 4.00 0.146 0.154 0.157 D1 2.67 2.97 3.50 0.105 0.117 0.138 E2 1.78 2.18 2.60 0.070 0.086 0.102 E 5.80 6.00 6.20 0.228 0.236 0.244 L 0.40 - 1.27 0.016 - 0.050 b 0.31 - 0.51 0.012 - 0.020 e 1.27 REF 0.050 REF 深圳市骊微电子科技有限公司w w w .s z l w t e ch .co m德信代理商