BD9140MUV-E2 Rohm Semiconductor, BD9140MUV-E2 Datasheet - Page 11

• Manufacturer Part Number: BD9140MUV-E2
• Description: IC SWITCH REG 2A W/FET VQFN020
• Manufacturer: Rohm Semiconductor
• Series: -r
• Type: Step-Down (Buck), PWM - Current Moder

Specifications of BD9140MUV-E2

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 2.5 V ~ 6 V
• Current - Output: 2A
• Frequency - Switching: 500kHz
• Voltage - Input: 4.5 V ~ 13.2 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: *
• Package / Case: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2009 ROHM Co., Ltd. All rights reserved.
BD9141MUV
www.rohm.com
V
5. Determination of output voltage
6.Selection of the reference voltage capacitor (C
CC
Stable feedback loop may be achieved by canceling the pole fp (Min.) produced by the output capacitor and the load
resistance with CR zero correction by the error amplifier.
The output voltage V
V
With R1 and R2 adjusted, the output voltage may be determined as required.
Use 1 kΩ～100 kΩ resistor for R1. if you can use the resistance more than
100kΩor they have a big range between the setting value of output voltage and
VREG voltage is the reference voltage created by Input voltage (Vcc
Voltage). C
The minimum input voltage depends on the setting output voltage.
Basically, it is recommended to use in the condition :
It is shown the necessary output current value at the minimum
input voltage. (DCR of inductor : 0.1Ω)See Fig.34.
This data is the characteristic value, so it doesn’t guarantee the
operation range.
input voltage.
OUT
V
=(R2/R1+1)×V
fz
Adjustable output voltage range : 2.5V～6.0V
CCmin
(Amp.)
V
R
C
OUT
Cin
ITH
ITH
VREG
= fp
= V
2π×R
Fig.32 Typical application
(Min.)
OUT
capacitor should be selected 0.1µF or more.
EN
V
ITH
OUT
OUT
ADJ
+1.3V.
ITH
1
×C
・・・(6) V
is determined by the equation (6):
V
GND,PGND
CC
ITH
,PV
CC
=
ADJ
SW
2π×R
: Voltage at ADJ terminal (0.8V Typ.)
L
OMax.
VREG
ESR
C
1
O
×C
)
11/15
O
R
O
V
OUT
7.5
6.5
5.5
4.5
Fig.34 minimum input voltage in each output voltage
8
7
6
5
0
Fig.33 Determination of output voltage
1
6
SW
ADJ
0.5
OUTPUT CURRENT : IOUT[A]
L
1
Co
Technical Note
2009.09 - Rev.B
Vo=6.0V
Vo=5.0V
Vo=4.0V
Vo=3.3V
1.5
R2
R1
Output
2