Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

BA3259HFP Scheda tecnica(PDF) 6 Page - Rohm

Il numero della parte BA3259HFP
Spiegazioni elettronici  Dual-output Secondary Fixed/Variable Output LDO Regulators for Local Power Supplies
Download  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  ROHM [Rohm]
Homepage  http://www.rohm.com
Logo ROHM - Rohm

BA3259HFP Scheda tecnica(HTML) 6 Page - Rohm

Back Button BA3259HFP_09 Datasheet HTML 2Page - Rohm BA3259HFP_09 Datasheet HTML 3Page - Rohm BA3259HFP_09 Datasheet HTML 4Page - Rohm BA3259HFP_09 Datasheet HTML 5Page - Rohm BA3259HFP_09 Datasheet HTML 6Page - Rohm BA3259HFP_09 Datasheet HTML 7Page - Rohm BA3259HFP_09 Datasheet HTML 8Page - Rohm BA3259HFP_09 Datasheet HTML 9Page - Rohm BA3259HFP_09 Datasheet HTML 10Page - Rohm  
Zoom Inzoom in Zoom Outzoom out
 6 / 10 page
background image
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


Codice articolo simile - BA3259HFP_09

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Rohm
BA3259HFP-TR ROHM-BA3259HFP-TR Datasheet
441Kb / 19P
   Dual-Output (Fixed/Variable) LDO Regulators
BA3259HFP ROHM-BA3259HFP_11 Datasheet
341Kb / 11P
   Secondary Dual-Output (Fixed/Variable) LDO Regulators
BA3259HFP ROHM-BA3259HFP_12 Datasheet
441Kb / 19P
   Dual-Output (Fixed/Variable) LDO Regulators
More results

Descrizione simile - BA3259HFP_09

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Rohm
BA3258HFP ROHM-BA3258HFP_09 Datasheet
357Kb / 9P
   Dual-output Secondary Fixed Output LDO Regulators for Local Power Supplies
BD00HC5WEFJ ROHM-BD00HC5WEFJ Datasheet
492Kb / 12P
   1.5A Secondary Variable Output LDO Regulators for Local Power Supplies
BD00HA5WEFJ ROHM-BD00HA5WEFJ Datasheet
457Kb / 12P
   500mA Secondary Variable Output LDO Regulators for Local Power Supplies
BD00GA3WEFJ ROHM-BD00GA3WEFJ Datasheet
523Kb / 12P
   300mA Secondary Variable Output LDO Regulators for Local Power Supplies
BD00GA5WEFJ ROHM-BD00GA5WEFJ Datasheet
463Kb / 12P
   500mA Secondary Variable Output LDO Regulators for Local Power Supplies
BD00HC0WEFJ ROHM-BD00HC0WEFJ Datasheet
491Kb / 12P
   1A Secondary Variable Output LDO Regulators for Local Power Supplies
BD00GC0WEFJ ROHM-BD00GC0WEFJ Datasheet
543Kb / 12P
   1A Secondary Variable Output LDO Regulators for Local Power Supplies
BD00HA3WEFJ ROHM-BD00HA3WEFJ Datasheet
513Kb / 12P
   300mA Secondary Variable Output LDO Regulators for Local Power Supplies
BA3259HFP ROHM-BA3259HFP_11 Datasheet
341Kb / 11P
   Secondary Dual-Output (Fixed/Variable) LDO Regulators
BA3258HFP ROHM-BA3258HFP_11 Datasheet
307Kb / 9P
   Dual Output Secondary Fixed Output LDO Regulators
More results


Html Pages

1 2 3 4 5 6 7 8 9 10


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com