PI3302-00-BGIZ_18 [VICOR]
8V to 36VIN Cool-Power ZVS Buck Regulator;
| 型号： | PI3302-00-BGIZ_18 |
| 厂家： | 
VICOR CORPORATION |
| 描述： | 8V to 36VIN Cool-Power ZVS Buck Regulator |
| 文件： | 总19页 (文件大小：948K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Cool-Power®
ZVS Switching Regulators
PI3302-00-BGIZ
8V to 36VIN Cool-Power ZVS Buck Regulator
Product Description
Features & Benefits
The PI3302-00 is a high efficiency, wide input range DC-DC
ZVS-Buck regulator integrating controller, power switches, and
support components all within a high density System-in-Package
(SiP). The integration of a high performance Zero-Voltage
Switching (ZVS) topology increases point of load performance
providing best in class power efficiency. The PI3302-00 requires
only an external inductor and minimal capacitors to form a
complete DC-DC switching mode Buck Regulator.
• High Efficiency ZVS-Buck Topology
• Wide input voltage range of 8V to 36V
• Very-Fast transient response
• High accuracy pre-trimmed output voltage
• User adjustable soft-start & tracking
• Power-up into pre-biased load (select versions)
• Parallel capable with single wire current sharing
• Input Over/Undervoltage Lockout (OVLO/UVLO)
• Output Overvoltage Protection (OVP)
• Overtemperature Protection (OTP)
• Fast and slow current limits
Output Voltage
Device
IOUT Max
Set
Range
5.0V
3.3 to 6.5V
10A
PI3302-00
The ZVS architecture also enables high frequency operation
while minimizing switching losses and maximizing efficiency.
The high switching frequency operation reduces the size of the
external filtering components, improves power density, and
enables very fast dynamic response to line and load transients.
The PI3302-00 sustains high switching frequency all the way
up to the rated input voltage without sacrificing efficiency and,
with its 20ns minimum on-time, supports large step down
conversions up to 36VIN.
• -40°C to 125°C operating range (TJ)
Applications
• High efficiency systems
• High voltage battery operation
Package Information
• 10.5mm x 14.5mm x 2.6mm BGA SiP
Cool-Power® ZVS Switching Regulators
Page 1 of 19
Rev 1.0
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PI3302-00-BGIZ
Contents
Order Information
3
4
Application Description
Output Voltage Trim
Soft-Start Adjust and Tracking
Inductor Pairing
12
12
13
14
14
15
Absolute Maximum Ratings
Functional Block Diagram
Pin Description
4
5
Package Pin-Out
5
Thermal Derating
PI3302-00-BGIZ (5.0VOUT) Electrical Characteristics
Functional Description
ENABLE (EN)
6
Layout Guidelines
10
10
10
10
10
10
11
11
11
11
11
11
11
11
Recommended PCB Footprint and Stencil
Package Drawing
16
17
18
19
Remote Sensing
Revision History
Switching Frequency Synchronization
Soft-Start
Warranty
Output Voltage Trim
Output Current Limit Protection
Input Undervoltage Lockout
Input Overvoltage Lockout
Output Overvoltage Protection
Overtemperature Protection
Pulse Skip Mode (PSM)
Variable Frequency Operation
Parallel Operation
Cool-Power® ZVS Switching Regulators
Page 2 of 19
Rev 1.0
05/2017
PI3302-00-BGIZ
Order Information
Output Range
Transport
Media
Cool-Power
IOUT Max
Package
10.5mm x 14.5mm BGA
Set
5.0V
Range
PI3302-00-BGIZ
3.3 to 6.5V
10A
TRAY
Cool-Power® ZVS Switching Regulators
Page 3 of 19
Rev 1.0
05/2017
PI3302-00-BGIZ
Absolute Maximum Ratings [1]
Name
Rating
VIN
-0.7 to 36V
[3]
VS1
-0.7 to 36VDC, -11V for ≤5ns operating [2]
.
SGND
100mA
PWRGD, SYNCO, SYNCI, EN, EAO, ADJ, TRK, ADR1, ADR2, SCL, SDA, REM
-0.3V to 5.5V / 5mA
-1.5V to 21V
VOUT
Storage Temperature
Operating Junction Temperature
Soldering Temperature for 20 seconds
ESD Rating
-65°C to 150°C
-40°C to 125°C
245°C
2kV HBM
[1] At 25°C ambient temperature. Stresses beyond these limits may cause permanent damage to the device. Operation at these conditions or conditions
beyond those listed in the Electrical Specifications table is not guaranteed. All voltage nodes are referenced to PGND unless otherwise noted.
Test conditions are per the specifications within the individual product electrical characteristics.
[2] Operating is defined as steady state 10A load with recommended 200nH inductor 10ꢀ when measured with 50Ω, 7.5GHz
transmission line probe LeCroy PP066 or equivalent.
[3] Transient peak operating conditions occurring for less than 1ms such as power cycling, short circuit and overload are guaranteed by design.
Functional Block Diagram
VIN
VOUT
Simplified Block Diagram
Cool-Power® ZVS Switching Regulators
Page 4 of 19
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PI3302-00-BGIZ
Pin Description
Pin Name
SGND
Number
Description
Signal Ground: Internal logic ground for EA, TRK, SYNCI, SYNCO and ADJ communication returns.
SGND and PGND are star connected within the regulator package.
Block 1
PGND
VIN
Block 2
Block 3
Block 5
Block 4
Power Ground: VIN and VOUT power returns.
Input Voltage: and sense for UVLO, OVLO and feed forward ramp.
Output Voltage: and sense for power switches and feed-forward ramp.
Switching Node: and ZVS sense for power switches.
VOUT
VS1
Power Good: High impedance when regulator is operating and VOUT is in regulation.
Otherwise pulls to SGND. Also can be used for parallel timing management intended for lead regulator.
PWRGD
EAO
EN
A1
A2
A3
A5
B1
Error Amp Output: External connection for additional compensation and current sharing.
Enable Input: Regulator enable control. Asserted high or left floating – regulator enabled;
Asserted low, regulator output disabled.
REM
ADJ
Remote Sense: High side connection. Connect to output regulation point.
Adjust Input: An external resistor may be connected between ADJ pin and SGND or VOUT
to trim the output voltage up or down.
Soft-start and Track Input: An external capacitor may be connected between TRK pin
and SGND to decrease the rate of rise during soft-start.
TRK
NC
C1
A4
K3
No Connect: Leave pins floating.
VDR can only be used for ADR0 and ADR1 pull up reference voltage.
No other external loading is permitted
VDR
SYNCO
SYNCI
K4
K5
Synchronization Output: Outputs a low signal for ½ of the minimum period for synchronization of other converters.
Synchronization Input: Synchronize to the falling edge of external clock frequency.
SYNCI is a high impedance digital input node and should always be connected to SGND when not in use.
SDA
SCL
D1
E1
Data Line: Connect to SGND.
Clock Line: Connect to SGND.
Tri-state Address: No connect.
Tri-state Address: No connect.
ADR1
ADR0
H1
G1
Package Pin-Out
PGND
Block 2
8
Block 1: B2-4, C2-4, D2-3, E2-3, F1-3, G2-3, H2-3, J1-3, K1-2
1
2
3
4
5
6
7
9
10
11
12
13
14
K
SGND
Block 1
J
H
G
F
VIN
Block 3
Block 2: A8-10, B8-10, C8-10, D8-10, E4-10,
ADR1
ADR0
SGND
F4-10, G4-10, H4-10, J4-10, K6-10
Block 3: G12-14, H12-14, J12-14, K12-14
Block 4: A12-14, B12-14, C12-14, D12-14, E12-14
Block 5: A6-7, B6-7, C6-7, D6-7
SCL
SDA
TRK
ADJ
E
D
C
B
VS1
Block 4
PWRGD
A
VOUT
Block 5
Cool-Power® ZVS Switching Regulators
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Rev 1.0
05/2017
PI3302-00-BGIZ
PI3302-00-BGIZ (5.0VOUT) Electrical Characteristics
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 200nH [4]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Input Specifications
[10]
Input Voltage
Input Current
VIN_DC
IIN_DC
8
24
36
20
V
A
VIN = 24V, TC = 25°C, IOUT = 10A
2.23
Input Current At Output Short
(fault condition duty cycle)
[5]
IIN_Short
mA
Disabled
2.0
2.5
mA
mA
Input Quiescent Current
Input Voltage Slew Rate
IQ_VIN
VIN_SR
Enabled (no load)
1
V/μs
Output Specifications
[5]
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
VOUT_DC
VOUT_DC
4.93
3.3
5.00
5.07
6.5
V
V
[6] [10]
∆VOUT (∆VIN) @25°C, 8V < VIN < 36V
0.10
0.10
30
ꢀ
Load Regulation
∆VOUT (∆IOUT
)
@25°C, 0.5A < IOUT < 10A
ꢀ
Output Voltage Ripple
VOUT_AC
IOUT = 5A, COUT = 4 x 47μF, 20MHz BW [7]
mVp-p
Continuous Output
Current Range
[8] [10]
IOUT_DC
IOUT_CL
10
A
A
Current Limit
12
Protection
VIN UVLO Start Threshold
VIN UVLO Stop Threshold
VIN UVLO Hysteresis
VUVLO_START
VUVLO_STOP
VUVLO_HYS
VOVLO_START
VOVLO_STOP
VOVLO_HYS
tf
7.10
6.80
7.60
7.25
0.33
8.00
7.60
V
V
V
VIN OVLO Start Threshold
VIN OVLO Stop Threshold
VIN OVLO Hysteresis
36.1
37.0
V
38.4
0.77
500
20
V
V
VIN UVLO/OVLO Response Time
Output Overvoltage Protection
ns
ꢀ
VOVP
Above VOUT
Overtemperature
Fault Threshold
TOTP
130
135
30
140
°C
°C
Overtemperature
Restart Hysteresis
TOTP_HYS
[4] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI3302-00 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[5] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[6] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[7] Refer to Output Ripple plots.
[8] Refer to Load Current vs. Ambient Temperature curves.
[9] Refer to Switching Frequency vs. Load current curves.
[10] Minimum 5V between VIN-VOUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 6 of 19
Rev 1.0
05/2017
PI3302-00-BGIZ
PI3302-00-BGIZ (5.0VOUT) Electrical Characteristics (Cont.)
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 200nH [4]
Parameter
Symbol
Conditions
Timing
Min
Typ
Max
Unit
[9]
Switching Frequency
Fault Restart Delay
fS
1.0
30
MHz
ms
tFR_DLY
Sync In (SYNCI)
Synchronization Frequency Range
∆fSYNC
I
Relative to set switching frequency [6]
50
110
ꢀ
SYNCI Threshold
VSYNCI
ZSYNCI
2.5
V
SYNCI Input Impedance
100
kΩ
Sync Out (SYNCO)
Source 1mA
SYNCO High
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
4.5
V
V
SYNCO Low
Sink 1mA
0.5
SYNCO Rise Time
SYNCO Fall Time
20pF load
10
10
ns
ns
20pF load
Soft Start And Tracking
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
VTRK
0
1.04
V
1.2
40
V
VTRK_OV
ITRK
ITRK_DIS
tSS
20
70
60
30
mV
μA
mA
ms
50
VTRK = 0.5V
CTRK = 0μF
6.8
2.2
Enable
High Threshold
Low Threshold
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
1.1
0.9
300
V
V
0.8
200
Threshold Hysteresis
mV
Enable Pull-Up Voltage
(Floating)
VEN_PU
VEN_PD
With positive logic EN polarity
With negative logic EN polarity
2
0
V
V
Enable Pull-Down Voltage
(Floating)
Source Current
Sink Current
IEN_SO
IEN_SK
With positive logic EN polarity
With negative logic EN polarity
50
50
μA
μA
[4] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI3302-00 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[5] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[6] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified.
[7] Refer to Output Ripple plots.
[8] Refer to Load Current vs. Ambient Temperature curves.
[9] Refer to Switching Frequency vs. Load current curves.
[10] Minimum 5V between VIN-VOUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 7 of 19
Rev 1.0
05/2017
PI3302-00-BGIZ
PI3302-00-BGIZ (5.0VOUT) Electrical Characteristics (Cont.)
100
95
90
85
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
10
9
Load Curent (A)
VIN = 12V
VIN = 24V
VIN = 36V
Figure 1 — Efficiency at 25°C
Figure 4 — Transient Response 2A to 7A, at 5A/µs
Figure 2 — Short Circuit Test
Figure 5 — Output Ripple 24VIN, 5.0VOUT at 10A
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1
2
3
4
5
6
7
8
10
9
Load Curent (A)
VIN = 12V
VIN = 24V
VIN = 36V
Figure 3 — Switching Frequency vs. Load Current
Figure 6 — Output Ripple 24VIN, 5.0VOUT at 5A
Cool-Power® ZVS Switching Regulators
Page 8 of 19
Rev 1.0
05/2017
PI3302-00-BGIZ
PI3302-00-BGIZ (5.0VOUT) Electrical Characteristics (Cont.)
12
10
8
6
4
2
0
50
75
100
125
125
125
Ambient Temperature (°C)
VIN = 8V
VIN = 24V
VIN = 36V
Figure 7 — Load Current vs. Ambient Temperature, 0LFM
12
10
8
6
4
2
0
50
75
100
Ambient Temperature (°C)
VIN = 8V
VIN = 24V
VIN = 36V
Figure 8 — Load Current vs. Ambient Temperature, 200LFM
12
10
8
6
4
2
0
50
75
100
Ambient Temperature (°C)
VIN = 8V
VIN = 24V
VIN = 36V
Figure 9 — Load Current vs. Ambient Temperature, 400LFM
Cool-Power® ZVS Switching Regulators
Page 9 of 19
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PI3302-00-BGIZ
Switching Frequency Synchronization
Functional Description
The SYNCI input allows the user to synchronize the controller
switching frequency by an external clock referenced to SGND. The
external clock can synchronize the unit between 50ꢀ and 110ꢀ
of the preset switching frequency (fS).
The PI3302-00 is a highly integrated ZVS-Buck regulator. The
PI3302-00 has a set output voltage that is trimmable within a
prescribed range shown in Table 1. Performance and maximum
output current are characterized with a specific external power
inductor (see Table 4).
The PI3302-00 default for SYNCI is to sync with respect to the
falling edge of the applied clock providing 180° phase shift from
SYNCO. This allows for the paralleling of two PI3302-00 devices
without the need for further user programming or external sync
clock circuitry.
When using the internal oscillator, the SYNCO pin provides a
5V clock that can be used to sync other regulators. Therefore,
one PI3302-00 can act as the lead regulator and have additional
PI3302-00s running in parallel and interleaved.
L1
VIN
VS1
VOUT
VIN
VOUT
COUT
CIN
PI33xx
PGND
REM
SYNCI
SYNCO
EN
TRK
ADJ
EAO
Soft-Start
The PI3302-00 includes an internal soft-start capacitor to
ramp the output voltage in 2ms from 0V to full output
voltage. Connecting an external capacitor from the TRK pin to
SGND will increase the start-up ramp period. See, “Soft Start
Adjustment and Track,” in the Applications Description section
for more details.
Output Voltage Trim
Figure 10 — ZVS-Buck with required components
The PI3302-00 output voltage can be trimmed up from the preset
output by connecting a resistor from ADJ pin to SGND and can
be trimmed down by connecting a resistor from ADJ pin to VOUT.
Table 1 defines the voltage range for PI3302-00.
For basic operation, Figure 10 shows the connections and
components required. No additional design or settings
are required.
Output Voltage
Device
ENABLE (EN)
Set
Range
EN is the enable pin of the converter. The EN Pin is referenced
to SGND and permits the user to turn the regulator on or off.
The EN default polarity is a positive logic assertion. If the EN pin
is left floating or asserted high, the converter output is enabled.
Pulling EN pin below 0.8VDC with respect to SGND will disable the
regulator output.
PI3302-00-BGIZ
5.0V
3.3 to 6.5V
Table 1 — PI3302-00-BGIZ output voltage range
When the EN pin polarity is programmed for negative logic
assertion; and if the EN pin is left floating, the regulator output is
enabled. Pulling the EN pin above 1.0VDC with respect to SGND,
will disable the regulator output.
Remote Sensing
An internal 100Ω resistor is connected between REM pin and
VOUT pin to provide regulation when the REM connection is
broken. Referring to Figure 10, it is important to note that L1 and
COUT are the output filter and the local sense point for the power
supply output. As such, the REM pin should be connected at COUT
as the default local sense connection unless remote sensing to
compensate additional distribution losses in the system. The REM
pin should not be left floating.
Cool-Power® ZVS Switching Regulators
Page 10 of 19
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PI3302-00-BGIZ
Output Current Limit Protection
Overtemperature Protection
PI3302-00 has two methods implemented to protect from output
short or over current condition.
The internal package temperature is monitored to prevent internal
components from reaching their thermal maximum. If the Over
Temperature Protection Threshold (OTP) is exceeded (TOTP), the
regulator will complete the current switching cycle, enter a low
power mode, set a fault flag, and will soft-start when the internal
temperature falls below Overtemperature Restart Hysteresis
(TOTP_HYS).
Slow Current Limit protection: prevents the output load
from sourcing current higher than the regulator’s maximum
rated current. If the output current exceeds the Current Limit
(IOUT_CL) for 1024μs, a slow current limit fault is initiated and the
regulator is shutdown which eliminates output current flow.
After Fault Restart Delay (tFR_DLY), a soft-start cycle is initiated.
This restart cycle will be repeated indefinitely until the excessive
load is removed.
Pulse Skip Mode (PSM)
PI3302-00 features a PSM to achieve high efficiency at light loads.
The regulators are setup to skip pulses if EAO falls below a PSM
threshold. Depending on conditions and component values, this
may result in single pulses or several consecutive pulses followed
by skipped pulses. Skipping cycles significantly reduces gate drive
power and improves light load efficiency. The regulator will leave
PSM once the EAO rises above the Skip Mode threshold.
Fast Current Limit protection: PI3302-00 monitors the
regulator inductor current pulse-by-pulse to prevent the output
from supplying very high current due to sudden low impedance
short (50A Typical). If the regulator senses a high inductor current
pulse, it will initiate a fault and stop switching until Fault Restart
Delay ends and then initiate a soft-start cycle.
Variable Frequency Operation
Input Undervoltage Lockout
Each PI3302-00 is preprogrammed to a base operating frequency,
with respect to the power stage inductor (see Table 4), to operate
at peak efficiency across line and load variations. At low line
and high load applications, the base frequency will decrease to
accommodate these extreme operating ranges. By stretching
the frequency, the ZVS operation is preserved throughout
the total input line voltage range therefore maintaining
optimum efficiency.
If VIN falls below the input Undervoltage Lockout (UVLO)
threshold, but remains high enough to power the internal bias
supply, the PI3302-00 will complete the current cycle, stop
switching, enter a low power state and initiate a fault. The system
will restart once the input voltage is reestablished and after the
Fault Restart Delay.
Input Overvoltage Lockout
Parallel Operation
If VIN exceeds the input Overvoltage Lockout (OVLO) threshold
(VOVLO), while the controller is running, the PI3302-00 will
complete the current cycle, stop switching, enter a low power
state and set an OVLO fault. The system will resume operation
when the input voltage falls below 98ꢀ of the OVLO threshold
and after the Fault Restart Delay.
Paralleling modules can be used to increase the output current
capability of a single power rail and reduce output voltage ripple.
L1
VIN
VIN
VS1
VOUT
Output Overvoltage Protection
VOUT
CIN
COUT
PGND
The PI3302-00 is equipped with output Overvoltage Protection
(OVP) to prevent damage to input voltage sensitive devices.
If the output voltage exceeds 20ꢀ of its set regulated value,
the regulator will complete the current cycle, stop switching
and issue an OVP fault. The system will resume operation once
the output voltage falls below the OVP threshold and after
Fault Restart Delay.
PI33xx
REM
PWRGD
SYNCI
SYNCO
EN
(#1)
R1
SYNCO(#2)
SYNCI(#2)
EN(#2)
EAO(#2)
TRK(#2)
EAO
TRK
SGND
L1
VIN
VIN
VS1
VOUT
CIN
COUT
PGND PI33xx
PWRGD
REM
(#2)
SYNCO(#1)
SYNCI
SYNCO
EN
SYNCI(#1)
EN(#1)
EAO(#1)
TRK(#1)
EAO
TRK
SGND
Figure 11 — PI3302-00-BGIZ parallel operation
Cool-Power® ZVS Switching Regulators
Page 11 of 19
Rev 1.0
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PI3302-00-BGIZ
The PI3302-00 default for SYNCI is to sync with respect to the
falling edge of the applied clock providing 180° phase shift from
SYNCO. This allows for the paralleling of two PI3302-00 devices
without the need for further user programming or external sync
clock circuitry.
Application Description
Output Voltage Trim
A post-package trim step is implemented to offset any resistor
divider network errors ensuring maximum output accuracy.
With a single resistor connected from the ADJ pin to SGND or
REM, each device’s output can be varied above or below the
nominal set voltage.
By connecting the EAO pins and SGND pins of each module
together the units will share the current equally. When the TRK
pins of each unit are connected together, the units will track each
other during soft-start and all unit EN pins have to be released to
allow the units to start (See Figure 11). Also, any fault event in any
regulator will disable the other regulators. The two regulators will
be out of phase with each other reducing output ripple (refer to
Switching Frequency Synchronization).
Output Voltage
Device
Set
Range
PI3302-00-BGIZ
5.0V
3.3 to 6.5V
Table 2 — PI3302-00 output voltage range
To provide synchronization between regulators over the entire
operational frequency range, the Power Good (PWRGD) pin must
be connected to the lead regulator’s (#1) SYNCI pin and a
2.5kΩ Resistor, R1, must be placed between SYNCO (#2) return
and the lead regulator’s SYNCI (#1) pin, as shown in Figure 11.
In this configuration, at system soft-start, the PWRGD pin pulls
SYNCI low forcing the lead regulator to initialize the open-loop
startup synchronization. Once the regulators reach regulation,
SYNCI is released and the system is now synchronized in a closed-
loop configuration which allows the system to adjust, on the
fly, when any of the individual regulators begin to enter variable
frequency mode in the loop.
The remote pin (REM) should always be connected to the VOUT
pin, if not used, to prevent an output voltage offset. Figure 12
shows the internal feedback voltage divider network.
R1, R2, and R4 are all internal 1.0ꢀ resistors and Rlow and Rhigh
are external resistors for which the designer can add to modify
VOUT to a desired output. The internal resistor value for each
regulator is listed below in Table 3.
VOUT
R4
REM
Rlow
R1
R2
ADJ
-
+
Rhigh
1.0 Vdc
SGND
Figure 12 — Internal resistor divider network
Cool-Power® ZVS Switching Regulators
Page 12 of 19
Rev 1.0
05/2017
PI3302-00-BGIZ
There is typically either proportional or direct tracking
Device
R1
R2
R4
implemented within a design. For proportional tracking between
several regulators at startup, simply connect all devices TRK
pins together. This type of tracking will force all connected
regulators to startup and reach regulation at the same time
(see Figure 13(a)).
PI3302-00-BGIZ
4.53kΩ
1.13kΩ
100Ω
Table 3 — PI3302-00 Internal divider values
By choosing an output voltage value within the ranges stated in
Table 2, VOUT can simply be adjusted up or down by selecting the
proper Rhigh or Rlow value, respectively. The following equations
can be used to calculate Rhigh and Rlow values:
VOUT
1
V
OUT 2
1
Rhigh
=
(1)
(
–
1
)
VOUT
R1
1
(a)
–
(R2 )
Master VOUT
VOUT
2
1
Rlow
=
(2)
1
1
–
(R1)
–
R2 V
(
1
(b)
)
OUT
+
If, for example, a 4.0V output is needed, the user should choose
the regulator with a trim range covering 4.0V from Table 2. For
this example, the PI3302 is selected (5.0V set voltage). First step
would be to use Equation (1) to calculate Rhigh since the required
output voltage is higher than the regulator set voltage. The
resistor-divider network values for the PI3302 can be found in
Table 3 and are R1 = 2.61kΩ and R2 = 1.13kΩ. Inserting these
values in to Equation (1), Rhigh is calculated as follows:
Figure 13 — PI3302-00 tracking methods
For Direct Tracking, choose the regulator with the highest output
voltage as the master and connect the master to the TRK pin of
the other regulators through a divider (Figure 14) with the same
ratio as the slave’s feedback divider (see Table 3 for values).
1
3.78kΩ =
(3)
(
)
1
–
1
4.0
2.61kΩ
–
(
)
Master VOUT
1.13kΩ
Resistor Rhigh should be connected as shown in Figure 12 to
achieve the desired 4.0V regulator output. No external Rlow
resistor is need in this design example since the trim is above the
regulator set voltage.The PI3302-00 output voltage can only be
trimmed higher than the factory 1V setting.
R1
PI33xx
TRK
Slave
R2
Soft-Start Adjust and Tracking
The TRK pin offers a means to increase the regulator’s soft-start
time or to track with additional regulators. The soft-start slope
is controlled by an internal 100nF and a fixed charge current to
provide a minimum startup time of 2ms (typical) for all PI3302-00
regulators. By adding an additional external capacitor to the TRK
pin, the soft-start time can be increased further. The following
equation can be used to calculate the proper capacitor for a
desired soft-start times:
SGND
Figure 14 — Voltage divider connections for direct tracking
All connected regulators’ soft-start slopes will track with this
method. Direct tracking timing is demonstrated in Figure 13(b). All
tracking regulators should have their Enable (EN) pins connected
together to work properly.
-9
–
CTRK
=
tTRK • ITRK
100 • 10
(4)
(
)
Where tTRK is the soft-start time and ITRK is a 50μA internal charge
current (see Electrical Characteristics for limits).
Cool-Power® ZVS Switching Regulators
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Inductor Pairing
Filter Considerations
The PI3302-00 utilizes an external inductor. This inductor has
been optimized for maximum efficiency performance. Table 4
details the specific inductor value and part number utilized for
each PI3302-00 device which are available from Coiltronics and
Eaton. Data sheets are available at:
The PI3302-00 requires input bulk storage capacitance as well as
low impedance ceramic X5R input capacitors to ensure proper
start up and high frequency decoupling for the power stage. The
PI3302-00 will draw nearly all of the high frequency current from
the low impedance ceramic capacitors when the main high side
MOSFET is conducting. During the time the high side MOSFET
is off, they are replenished from the bulk capacitor. If the input
impedance is high at the switching frequency of the converter,
the bulk capacitor must supply all of the average current into the
converter, including replenishing the ceramic capacitors. This value
has been chosen to be 100μF so that the PI3302-00 can start up
into a full resistive load and supply the output capacitive load with
the default minimum soft start capacitor when the input source
impedance is 50Ω at 1MHz. The ESR for this capacitor should be
approximately 20mΩ. The RMS ripple current in this capacitor is
small, so it should not be a concern if the input recommended
ceramic capacitors are used. Table 5 shows the recommended
input and output capacitors to be used for the various models
as well as expected transient response, RMS ripple currents per
capacitor, and input and output ripple voltages. Table 6 includes
the recommended input and output ceramic capacitors.
http://www.cooperindustries.com
Inductor
[nH]
Inductor
Part Number
Device
Manufacturer
PI3302-00-BGIZ
200
FPT705-200-R
Coiltronics
Table 4 — PI3302-00 Inductor pairing
Thermal Derating
Thermal de-rating curves are provided that are based on
component temperature changes versus load current, input
voltage and air flow. It is recommended to use these curves as a
guideline for proper thermal de-rating. These curves represent the
entire system and are inclusive to both the PI3302-00 regulator
and the external inductor. Maximum thermal operation is limited
by either the MOSFETs or inductor depending upon line and
load conditions.
Thermal measurements were made using a standard PI3302-00
Evaluation board which is 3 x 4 inches in area and uses 4-layer,
2oz copper. Thermal measurements were made on the three
main power devices, the two internal MOSFETs and the external
inductor, with air flows of 0, 200, and 400LFM.
CINPUT
Ripple
Current Current
COUTPUT
Ripple
Load
Step
(A)
CINPUT
Ceramic
X5R
CINPUT
Bulk
Elec.
COUTPUT
Ceramic
X5R
Input
Ripple
(mVpp)
Output
Ripple
(mVpp)
Output Recovery
VIN
(V)
ILOAD
(A)
Device
Ripple
Time
(µs)
(mVpp)
(IRMS
)
(IRMS
)
(Slew/µs)
10
5
220
140
50
30
4 X 47μF
2 X 1μF
1 X 0.1μF
100μF
50V
5
PI3302
24
4 x 4.7μF
1.2
1.5
170
30
(5A/μs)
Table 5 — Recommended input and output capacitance
Cool-Power® ZVS Switching Regulators
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When Q1 is on and Q2 is off, the majority of CIN’s current is used
to satisfy the output load and to recharge the COUT capacitors.
When Q1 is off and Q2 is on, the load current is supplied by the
inductor and the COUT capacitor as shown in Figure 17. During this
period CIN is also being recharged by the VIN. Minimizing CIN loop
inductance is important to reduce peak voltage excursions when
Q1 turns off. Also, the difference in area between the CIN loop
and COUT loop is vital to minimize switching and GND noise.
Murata Part Number
GRM188R71C105KA12D
GRM319R71H104KA01D
GRM31CR71H475KA12K
GRM31CR61A476ME15L
Description
1μF 16V 0603 X7R
0.1μF 50V 1206 X7R
4.7μF 50V 1206 X7R
47μF 10V 1206 X5R
Table 6 — Capacitor manufacturer part numbers
Layout Guidelines
VIN
CIN
To optimize maximum efficiency and low noise performance
from a PI3302-00 design, layout considerations are necessary.
Reducing trace resistance and minimizing high current loop
returns along with proper component placement will contribute
to optimized performance.
COUT
A typical buck converter circuit is shown in Figure 15. The
potential areas of high parasitic inductance and resistance are the
circuit return paths, shown as LR below.
Figure 17 — Current flow: Q2 closed
The recommended component placement, shown in Figure 18,
illustrates the tight path between CIN and COUT (and VIN and VOUT
for the high AC return current. This optimized layout is used on
the PI3302-00 evaluation board.
)
VIN
CIN
COUT
VOUT
Figure 15 — Typical Buck Converter
COUT
GND
The path between the COUT and CIN capacitors is of particular
importance since the AC currents are flowing through both of
them when Q1 is turned on.
CIN
VSW
VIN
Figure 16, schematically, shows the reduced trace length
between input and output capacitors. The shorter path
lessens the effects that copper trace parasitics can have on the
PI3302-00 performance.
GND
Figure 18 — Recommended component placement and
VIN
CIN
metal routing
Figure 19 details the recommended receiving footprint for
PI3302-00-BGIZ. All pads should have a final copper size of
0.55mm x 0.55mm, whether they are solder-mask defined or
copper defined, on a 1mm x 1mm grid. All stencil openings are
0.45mm when using either a 5mil or 6mil stencil.
COUT
Figure 16 — Current flow: Q1 closed
Cool-Power® ZVS Switching Regulators
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Recommended PCB Footprint and Stencil
Figure 19 — Recommended Receiving PCB footprint
Cool-Power® ZVS Switching Regulators
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Package Drawing
Cool-Power® ZVS Switching Regulators
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Revision History
Revision
Date
Description
Initial release as standalone data sheet
Page Number(s)
1.0
05/17/17
n/a
Note: PI3302-00-BGIZ part was initially released on 01/06/16.
See family data sheet PI33xx-x0, revisions 1.9 – 2.5 for previous iterations of the data for this part number.
Cool-Power® ZVS Switching Regulators
Page 18 of 19
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PI3302-00-BGIZ
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Cool-Power® ZVS Switching Regulators
Page 19 of 19
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