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BA3259HFP Folha de dados(PDF) 7 Page - Rohm

Nome de Peças BA3259HFP
Descrição Electrónicos  Secondary Dual-Output (Fixed/Variable) LDO Regulators
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Fabricante Electrônico  ROHM [Rohm]
Página de início  http://www.rohm.com
Logo ROHM - Rohm

BA3259HFP Folha de dados(HTML) 7 Page - Rohm

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Technical Note
7/10
www.rohm.com
2011.03 - Rev.B
© 2011 ROHM Co., Ltd. All rights reserved.
BA3259HFP,BA30E00WHFP
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
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
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
Fig. 27 Ambient Temperature vs. Power Dissipation
Fig.28 BA3259HFP ESR
Fig.29 BA30E00WHFP ESR
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
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


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