BD95500MUV-E2 Rohm Semiconductor, BD95500MUV-E2 Datasheet - Page 12

• Manufacturer Part Number: BD95500MUV-E2
• Description: IC BUCK ADJ 6A 40VQFN
• Manufacturer: Rohm Semiconductor
• Type: Step-Down (Buck)r

Specifications of BD95500MUV-E2

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.7 ~ 5 V
• Current - Output: 6A
• Frequency - Switching: 30kHz ~ 100kHz
• Voltage - Input: 3 ~ 20 V
• Operating Temperature: -10°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 40-VQFN
• Power - Output: 4.66W
• Output Voltage: 7 V
• Output Current: 6 A
• Input Voltage: 3 V to 20 V
• Switching Frequency: 200 KHz to 1000 KHz
• Operating Temperature Range: - 10 C to + 100 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: BD95500MUV-E2TR

●External Component Selection
PGND
HG
LG
PGND
PGND
HG
HG
LG
LG
1. Inductor (L) selection
※Passing a current larger than the inductor’s rated current will cause magnetic saturation in the inductor and decrease
※To minimize possible inductor damage and maximize efficiency, choose a inductor with a low (DCR, ACR) resistance.
2. Output Capacitor (C
Please give due consideration to the conditions in formula (8) below for output capacity, bear in mind that output rise time must
be established within the soft start time frame.
3. Input Capacitor (Cin) Selection
A low ESR capacitor is recommended to reduce ESR loss and maximize efficiency.
Note: Improper capacitor may cause startup malfunctions
system efficiency. In selecting the inductor, be sure to allow enough margin to assure that peak current does not exceed the
inductor rated current value.
Output Ripple Current
SW
Output Capacitor
Input Capacitor
VIN
Co≦
SW
SW
VIN
VIN
L
IL
L
TSS×(Limit-I
L
Cin
V
ΔIL
OUT
Co
Co
O
VOUT
) Selection
ESR
ESL
Co
OUT
VOUT
VOUT
)
・・・(8)
When determining the proper output capacitor, be sure to factor in the equivalent
series resistance and equivalent series inductance required to set the output ripple
voltage 20mV or more.
In selecting the limit of inductor, be sure to allow enough margin for output voltage.
Output ripple voltage is determined as in formula (7) below.
ΔV
(ΔI
The input capacitor selected must have low enough ESR resistance to fully support
large ripple output, in order to prevent extreme over current. The formula for ripple
current IRMS is given in (9) below.
ESL: equivalent series inductance)
L
IRMS=I
Where V
OUT
: Output ripple current; ESR: C
=ΔI
OUT
L
IN
×ESR + ESL×ΔI
The proper output ripple current setting is about 30% of maximum
output current.
The inductor value is a major influence on the output ripple current.
As formula (5) below indicates, the greater the inductor or the
switching frequency, the lower the ripple current.
=2×V
Tss: Soft start time (See formula (2) in P10)
Limit: Over current detection (See formula (10)(11) in P13)
×
12/20
√
OUT
V
ΔI
ΔI
(ΔI
IN
, IRMS=
L=
L
L
(V
L
=
=0.3×I
: output ripple current; f: switch frequency)
V
IN
IN
-V
(V
(V
L
OUT
IN
IN
/ T
OUT
-V
L×V
L×V
-V
I
O
)
OUT
ON
OUT
2
OUT
max. [A]・・・(5)
equivalent series resistance,
・・・(7)
IN
IN
[A]・・・(9)
)×V
)×V
×f
×f
OUT
OUT
[H]・・・(6)
[A]・・・(4)