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®
PI33/PI34/PI35xx Series
ZVS Buck Regulators
HV to PoL Buck Regulator Applications, Computing, Communications, Industrial,
Automotive Equipment. Constant current applications: LED Lighting and Battery Charging
Features and Benefits
Wide Input Operating Ranges
Description
n12 VIN nominal (8 to 18 VIN )
n24 VIN nominal (8 to 36 VIN )
n48 VIN nominal (34 to 60 VIN )
n-40°C to 125°C temperature operating range
PI33/PI34/PI35xx Cool-Power® ZVS Buck Regulators offer boardlevel designers maximum power density and flexibility for highefficiency point-of-load DC-DC regulation. The integration of a
high performance Zero-Voltage Switching (ZVS) topology increases
point-of-load performance, providing best-in-class power efficiency
up to 98%. Cool-Power ZVS Regulators are highly integrated with
control circuitry, power semiconductors and support components in
a high density LGA System in Package (SiP).
Simple to Use; Fast Development Time
nInternal compensation - few external components
nNo additional design or additional settings required
High Efficiency
n>96% peak 48 VIN to 12 VOUT
n>96% peak 24 VIN to 12 VOUT
n>95% peak 12 VIN to 5 VOUT
nLight load and full load high efficiency performance
Power delivery can be further increased by inter-leaving multiple
buck regulators using single wire current sharing. Use of a ZVS
topology enables high-frequency operation that maximizes
efficiency by minimizing the significant switching losses associated
with conventional buck regulators using hard-switching topologies.
The high switching frequency of the Cool-Power ZVS Regulators
also reduces the size of the external filtering components, improving
power density while enabling fast dynamic response to line and load
transients. These regulators sustain high switching frequency all the
way up to the rated input voltage without sacrificing efficiency and,
with its 20 ns minimum on-time, supports step down conversion
for input voltages up to 60V. The Cool-Power ZVS series offers
buck regulators for 12 VIN, 24 VIN, and 48 VIN nominal systems.
Packaging of the bucks is either in a 10 x 10 x 2.5 mm or
10 x 14 x 2.5 mm LGA package. All devices within their respective
series share the same footprint.
Flexible and Rich Feature Set
nParalleling and single wire current sharing
nFrequency synchronization
nUser adjustable soft-start & tracking
nPI33xx optional I2C telemetry & functionality
– Vout margining
– Fault reporting
– Enable and SYNCI pin polarity
– Phase delay (for interleaving multiple regulators)
High Density Packaging Platform
n10 x 14 x 2.5 mm SiP LGA
n10 x 10 x 2.5 mm SiP LGA
PI33xx/PI34xx Basic Application
Picor Cool-Power®
10mm
PI354x Block Diagram
L1
Vin
Vin
ZVS Buck Regulator
Cin
19mm
PGND
ZVS Buck
PI33XX
VS1
Vout
Vout
Cout
REM
SYNCI
SYNCO
EN
SGND
Inductor
TRK
ADJ
EAO
14mm
Cool-PowerCool-Power
Required Components
and GeneralCool-Power
Dimensions
ZVS Buck Regulator
schematic with minimum
with required components and
required external components
general dimensions
vicorpower.com
Rev 1.8 5/2015
PI34xx Efficiency
Part Numbering
PI34xx 12Vin
100
Cool-Power
95
8 – 18 VIN
85
80
% Efficiency
Iout Max
12 V Nominal Versions
90
75
PI3420-00-LGIZ
1.0 V
1.0 – 1.4 V
15 A
PI3421-00-LGIZ
1.8 V
1.4 – 2.0 V
15 A
PI3422-00-LGIZ
2.5 V
2.0 – 3.1 V
15 A
PI3423-00-LGIZ
3.3 V
2.3 – 4.1 V
15 A
PI3424-00-LGIZ
5.0 V
3.3 – 6.5 V
15 A
24 V Nominal Versions
70
65
60
5 VOUT
3.3 VOUT
2.5 VOUT
PI3311-00-LGIZ
1.0 V
1.0 – 1.4 V
10 A
PI3318-00-LGIZ
1.8 V
1.4 – 2.0 V
10 A
PI3312-00-LGIZ
2.5 V
2.0 – 3.1 V
10 A
1.8 VOUT
PI3301-00-LGIZ
3.3 V
2.3 – 4.1 V
10 A
1.0 VOUT
PI3302-00-LGIZ
5.0 V
3.3 – 6.5 V
10 A
PI3303-00-LGIZ
12 V
6.5 – 13.0 V
8A
PI3305-00-LGIZ
15 V
10.0 – 16.0 V
8A
55
50
1
2
3
4
5
6 7 8 9
24Vin
Iout (A)
24 V Nominal (High Current) Versions
10 11 12 13 14 15
8 – 36 VIN
0
PI33xx Efficiency
100
PI3311-01-LGIZ
1.0 V
1.0 –1.4 V
15 A
PI3318-01-LGIZ
1.8 V
1.4 – 2.0 V
15 A
PI3312-01-LGIZ
2.5 V
2.0 – 3.1 V
15 A
PI3301-01-LGIZ
3.3 V
2.3 – 4.1 V
15 A
5V
3.3 – 6.5 V
15 A
PI3302-03-LGIZ**
24 V Nominal I2C* Functionality
95
PI3311-20-LGIZ
1.0 V
1.0 – 1.4 V
10 A
PI3318-20-LGIZ
1.8 V
1.4 – 2.0 V
10 A
PI3312-20-LGIZ
2.5 V
2.0 – 3.1 V
10 A
PI3301-20-LGIZ
3.3 V
2.3 – 4.1 V
10 A
PI3302-20-LGIZ
5.0 V
3.3 – 6.5 V
10 A
75
PI3303-20-LGIZ
12 V
6.5 – 13.0 V
8A
PI3305-20-LGIZ
15 V
10.0 – 16.0 V
8A
70
PI3311-21-LGIZ
1.0 V
1.0 – 1.4 V
15 A
90
85
80
15 VOUT
12 VOUT
65
60
55
50
0
1
2
3
4
5
6
PI3318-21-LGIZ
1.8 V
1.4 – 2.0 V
15 A
5 VOUT
PI3312-21-LGIZ
2.5 V
2.0 – 3.1 V
15 A
3.3 VOUT
PI3301-21-LGIZ
3.3 V
2.3 – 4.1 V
15 A
2.5 VOUT
48 V Nominal Versions
1.0 VOUT
PI3542-00-LGIZ
2.5 V
2.2 – 3.0 V
10 A
PI3543-00-LGIZ
3.3 V
2.6 – 3.6 V
10 A
PI3545-00-LGIZ
5.0 V
4.0 – 5.5 V
10 A
PI3546-00-LGIZ
12.0 V
6.5 – 14.0 V
9A
7
8
9
10
Iout [A]
PI35xx Efficiency
48 Vin
36 – 60 VIN
% Efficiency
Output Range
Set
Range
* I2C is a trademark of NXP Semiconductors
**Input operating range is limited to 11 V to 36 V
100
PI354x Basic Application
95
% Efficiency
90
85
12 VOUT
80
5 VOUT
3.3 VOUT
75
2.5 VOUT
70
65
0
1
2
3
4
5
Iout [A]
6
7
8
9
10
vicorpower.com
Rev 1.8 5/2015
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