Integrated POL Voltage Regulator Product Selection Guide

• Single stage conversion saves energy,
size and cost by eliminating the need for
an intermediate bus
• Low profile and excellent thermal perfor mance allows back-side board mounting
• Integrated solution and high switching
frequency offer high power density
with reduced component count
2-4A
4-6A
6-10A
IR3841W
10-16A
IR3840W
16-25A
25-35A
High Switching Frequency and
High Input Voltage
*DDR Tracking
†
IR3853
IR3473
IR3856
IR3859
IR3475
IR3476
IR3477
Dual Output
Size(mm)
1,000kHz
5x7
Difficult:
IR does well
Easy
≤ 35A
5x6
600kHz
≤ 25A
4x5
Easy
300kHz
3.3V
5V
12V
3.5 x 3.5
≤ 10A
≤ 3A
SupIRBuck®
25V
10
Current (A)
mypower.irf.com/supirbuck
SupIRBuck® Online Design Tool
Simplifies Design
Comprehensive online design
tool featuring parametric search,
schematic capture, AC, Steady State,
Transient Analysis, Thermal Analysis,
BOM creation, and more…
35
Design Requirements
Design Configuration
es
ize
ck
ag
Pa
yn
c.
Ma
rg
Tra inin
ck g &
ing
Se
Ac
cu
rac
y
[V]
t [A
]
Iou
lf B
ias
Me
ol
ntr
D
Re iffer
mo en
te tial
Se
ns
e
IR3823
IR3897*
IR3891†
IR3839*
IR3892†
IR3898*
IR3838*
IR3899*
IR3837*
IR3894*
IR3895*
IR3847*
IR3846*
Fre
q.
S
IR3843W
IR3842W
1-3A
Ma
xV
in
1 - 21V
Integrated LDO
Ma
x
1 - 16V
5V bias required
Constant
On-Time
1.5 - 21V
3 - 27V
5V bias required
Co
• Common series footprint enables “cut
and paste” design and scalability for
faster time to market
um
be
r
PWM
Pa
rt N
• Best-in-class efficiency
tho
d
Integrated Voltage Regulator Product Offering
P
Cu rog
rre ram
nt
Pro Ove
tec r
tio
n
Pro
gra
m
So
ft S
tar
t
Ov
er
Pro Vol
tec tage
tio
n
The IR Advantage
IR3891
PWM
Y
4+4
21
1%
---
---
Latch
Y
---
---
5x6mm
IR3892
PWM
Y
6+6
21
1%
---
---
Latch
Y
---
---
5x6mm
IR3823
PWM
Y
3
21
0.6%
---
Y
Latch
Y
---
---
3.5x3.5mm
IR3897
PWM
Y
4
21
0.5%
---
---
Latch
Y
Y
---
4x5mm
IR3898
PWM
Y
6
21
0.5%
---
---
Latch
Y
Y
---
4x5mm
IR3899
PWM
Y
9
21
0.5%
---
---
Latch
Y
Y
---
4x5mm
IR3894
PWM
Y
12
21
0.5%
---
---
Latch
Y
Y
---
5x6mm
IR3895
PWM
Y
16
21
0.5%
---
---
Latch
Y
Y
---
5x6mm
IR3846
PWM
Y
35
21
0.5%
Y
---
Latch
Y
Y
Y
5x7mm
IR3847
PWM
Y
25
21
0.5%
Y
---
Latch
Y
Y
Y
5x6mm
IR3837
PWM
Y
14
16
1%
Y
---
Flag
Y
Y
---
5x6mm
IR3838
PWM
Y
10
16
1%
Y
---
Flag
Y
Y
---
5x6mm
IR3839
PWM
Y
6
16
1%
Y
---
Flag
Y
Y
---
5x6mm
IR3840W
PWM
---
12
16
1%
Y
Y
Flag
---
---
---
5x6mm
IR3841W
PWM
---
8
16
1%
Y
Y
Flag
---
---
---
5x6mm
IR3842W
PWM
---
4
16
1%
Y
Y
Flag
---
---
---
5x6mm
IR3843W
PWM
---
2
16
1%
Y
Y
Flag
---
---
---
5x6mm
IR3853
PWM
---
4
21
1%
Y
Y
Latch
Y
---
---
4x5mm
IR3856
PWM
---
6
21
1%
Y
Y
Latch
Y
---
---
4x5mm
IR3859
PWM
---
9
21
1%
Y
Y
Latch
Y
---
---
4x5mm
IR3473
COT*
---
6
27
1%
Y
Y
Latch
---
---
---
4x5mm
IR3475
COT*
---
10
27
1%
Y
Y
Latch
---
---
---
4x5mm
IR3476
COT*
---
12
27
1%
Y
Y
Latch
---
---
---
5x6mm
IR3477
COT*
---
15
27
1%
Y
Y
Latch
---
---
---
5x6mm
* Constant On Time control offers improved light load efficiency
Simulation
PCB Layout and
Thermal Analysis
Summary
• Single stage conversion saves energy,
size and cost by eliminating the need for
an intermediate bus
• Low profile and excellent thermal perfor mance allows back-side board mounting
• Integrated solution and high switching
frequency offer high power density
with reduced component count
2-4A
4-6A
6-10A
IR3841W
10-16A
IR3840W
16-25A
25-35A
High Switching Frequency and
High Input Voltage
*DDR Tracking
†
IR3853
IR3473
IR3856
IR3859
IR3475
IR3476
IR3477
Dual Output
Size(mm)
1,000kHz
5x7
Difficult:
IR does well
Easy
≤ 35A
5x6
600kHz
≤ 25A
4x5
Easy
300kHz
3.3V
5V
12V
3.5 x 3.5
≤ 10A
≤ 3A
SupIRBuck®
25V
10
Current (A)
mypower.irf.com/supirbuck
SupIRBuck® Online Design Tool
Simplifies Design
Comprehensive online design
tool featuring parametric search,
schematic capture, AC, Steady State,
Transient Analysis, Thermal Analysis,
BOM creation, and more…
35
Design Requirements
Design Configuration
es
ize
ck
ag
Pa
yn
c.
Ma
rg
Tra inin
ck g &
ing
Se
Ac
cu
rac
y
[V]
t [A
]
Iou
lf B
ias
Me
ol
ntr
D
Re iffer
mo en
te tial
Se
ns
e
IR3823
IR3897*
IR3891†
IR3839*
IR3892†
IR3898*
IR3838*
IR3899*
IR3837*
IR3894*
IR3895*
IR3847*
IR3846*
Fre
q.
S
IR3843W
IR3842W
1-3A
Ma
xV
in
1 - 21V
Integrated LDO
Ma
x
1 - 16V
5V bias required
Constant
On-Time
1.5 - 21V
3 - 27V
5V bias required
Co
• Common series footprint enables “cut
and paste” design and scalability for
faster time to market
um
be
r
PWM
Pa
rt N
• Best-in-class efficiency
tho
d
Integrated Voltage Regulator Product Offering
P
Cu rog
rre ram
nt
Pro Ove
tec r
tio
n
Pro
gra
m
So
ft S
tar
t
Ov
er
Pro Vol
tec tage
tio
n
The IR Advantage
IR3891
PWM
Y
4+4
21
1%
---
---
Latch
Y
---
---
5x6mm
IR3892
PWM
Y
6+6
21
1%
---
---
Latch
Y
---
---
5x6mm
IR3823
PWM
Y
3
21
0.6%
---
Y
Latch
Y
---
---
3.5x3.5mm
IR3897
PWM
Y
4
21
0.5%
---
---
Latch
Y
Y
---
4x5mm
IR3898
PWM
Y
6
21
0.5%
---
---
Latch
Y
Y
---
4x5mm
IR3899
PWM
Y
9
21
0.5%
---
---
Latch
Y
Y
---
4x5mm
IR3894
PWM
Y
12
21
0.5%
---
---
Latch
Y
Y
---
5x6mm
IR3895
PWM
Y
16
21
0.5%
---
---
Latch
Y
Y
---
5x6mm
IR3846
PWM
Y
35
21
0.5%
Y
---
Latch
Y
Y
Y
5x7mm
IR3847
PWM
Y
25
21
0.5%
Y
---
Latch
Y
Y
Y
5x6mm
IR3837
PWM
Y
14
16
1%
Y
---
Flag
Y
Y
---
5x6mm
IR3838
PWM
Y
10
16
1%
Y
---
Flag
Y
Y
---
5x6mm
IR3839
PWM
Y
6
16
1%
Y
---
Flag
Y
Y
---
5x6mm
IR3840W
PWM
---
12
16
1%
Y
Y
Flag
---
---
---
5x6mm
IR3841W
PWM
---
8
16
1%
Y
Y
Flag
---
---
---
5x6mm
IR3842W
PWM
---
4
16
1%
Y
Y
Flag
---
---
---
5x6mm
IR3843W
PWM
---
2
16
1%
Y
Y
Flag
---
---
---
5x6mm
IR3853
PWM
---
4
21
1%
Y
Y
Latch
Y
---
---
4x5mm
IR3856
PWM
---
6
21
1%
Y
Y
Latch
Y
---
---
4x5mm
IR3859
PWM
---
9
21
1%
Y
Y
Latch
Y
---
---
4x5mm
IR3473
COT*
---
6
27
1%
Y
Y
Latch
---
---
---
4x5mm
IR3475
COT*
---
10
27
1%
Y
Y
Latch
---
---
---
4x5mm
IR3476
COT*
---
12
27
1%
Y
Y
Latch
---
---
---
5x6mm
IR3477
COT*
---
15
27
1%
Y
Y
Latch
---
---
---
5x6mm
* Constant On Time control offers improved light load efficiency
Simulation
PCB Layout and
Thermal Analysis
Summary