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BA30E00WHFP Fiches technique(PDF) 6 Page - Rohm |
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BA30E00WHFP Fiches technique(HTML) 6 Page - Rohm |
6 / 10 page BA3259HFP,BA30E00WHFP Technical Note 6/9 www.rohm.com 2009.04 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. Function Explanation 1) Two-input power supply (BA30E00WHFP) The input voltages (Vcc1 and Vcc2) supply power to two outputs (Vo1 and Vo2, respectively). The power dissipation between the input and output pins can be suppressed for each output according to usage. 2) Standby function (BA30E00WHFP) The standby function is operated through the EN pin. Output is turned on at 2.0 V or higher and turned off at 0.8 V or lower. Thermal Design If the IC is used under the conditions of excess of the power dissipation, the chip temperature will rise, which will have an adverse effect on the electrical characteristics of the IC, such as a reduction in current capability. Furthermore, if the temperature exceeds Tjmax, element deterioration or damage may occur. Implement proper thermal designs to ensure that the power dissipation is within the permissible range in order to prevent instantaneous IC damage resulting from heat and maintain the reliability of the IC for long-term operation. Refer to the power derating characteristics curves in Fig. 27. Power Consumption Pc (W) Calculation Method: BA3259HFP BA30E00WHFP The Icc (circuit current) varies with the load. Refer to the above and implement proper thermal designs so that the IC will not be used under conditions of excess power dissipation Pd under all operating temperatures. Vcc GND Vo1 Vo2 Controller Icc IP Vcc Vcc Io1 Io2 3.3 V output 0.8 V to 3.3 V output Power Tr Power Tr Vcc1 GND Io1 Io2 Controller Icc1+Icc2 Vcc1 Vcc2 Io1 Io2 3.3 V output 0.8 V to 3.3 V output Vcc2 IB1 IB2 Power Tr Power Tr Power consumption of power transistor on Vol1 (3.3 V output) Pc1=(Vcc1 − Vo1) Io1 Power consumption of power transistor on Vo2 (variable output ) Pc2=(Vcc2 − Vo2) Io2 Power consumption by circuit current Pc3=Vcc1 Icc1 + Vcc2 Icc2 Pc=Pc1 + Pc2 + Pc3 * Vcc1, Vcc2: Applied voltage Io1: Load current on 3.3 V output side Io2: Load current on variable output side Icc1, Icc2: Circuit currents Power consumption of 3.3 V power transistor Pc1=(Vcc − 3.3) Io1 Power consumption of Vo2 power transistor Pc2=(Vcc − Vo2) Io2 Power consumption by circuit current Pc3=Vcc Icc Pc=Pc1 + Pc2 + Pc3 * Vcc: Applied voltage Io1: Load current on Vo1 side Io2: Load current on Vo2 side Icc: Circuit current 5V Vcc Vo1 Vo2 REG1 REG2 3.3 V/0.3 A 1.8 V/0.3 A Power loss between input and output (Vcc − Vo1) Io1 + (Vcc − Vo2) Io2 = (5 − 3.3) 0.3 + (5 − 1.8) 0.3 = 0.51W + 0.96W = 1.47W Single 5V input results in decreased efficiency Power loss between input and output (Vcc1 − Vo1) Io1 + (Vcc2 − Vo2) Io2 = (5 − 3.3) 0.3 + (5 − 1.8) 0.3 = 0.51W + 0.36W = 0.87W Reduced power loss by 0.6W. Additional 3V input improves efficiency 8 10 (3) 7.3W 9 7 6 5 4 3 2 1 0 AMBIENT TEMPERATURE: Ta [°C] 25 50 75 100 125 150 Board size: 70 mm 70 mm 1.6 mm (with a thermal via incorporated by the board) Board surface area: 10.5 mm 10.5 mm (1) 2-layer board (Backside copper foil area: 15 mm 15 mm) (2) 2-layer board (Backside copper foil area: 70 mm 70 mm) (3) 4-layer board (Backside copper foil area: 70 mm 70 mm) 0 (2) 5.5W (1) 2.3W 200 400 600 800 1000 0 0.01 0.1 0.5 1.0 2.0 Io [mA] Stable region 0.02 0.05 0.2 5.0 Unstable region 10.0 Io [mA] 200 400 600 800 1000 0 0.01 0.1 0.5 1.0 2.0 0.02 0.05 0.2 5.0 Unstable region 10.0 Stable region 0.7 Unstable region 5V Vcc Vo1 Vo2 REG1 REG2 3V 3.3 V/0.3 A 1.8 V/0.3 A Conventional Efficiency comparison: 5V single input vs. 5V/3V two inputs Regulator with single input and two outputs Regulator with two inputs and two outputs (Vo2=1.8V, Io1=Io2=0.3A) Current Fig. 27 Ambient Temperature vs. Power Dissipation Fig.28 BA3259HFP ESR Fig.29 BA30E00WHFP ESR |
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