KIT34716EPEVBE, Using the 1.0 MHz Fully Integrated DDR Switch-Mode Power Supply (34712) - User Guide

Freescale Semiconductor
Users Guide
Documentation Number: KT34716UG
Rev. 3.0, 1/2009
Using the 1.0 MHz Dual Switch-Mode DDR Power
Supply (KIT34716EPEVBE)
1
Introduction
This User’s Guide will help the designer get better
acquainted with the 34716 IC and Evaluation board.
It contains a procedure to configure each block of
the 34716 in a practical way, which is based on a
working Evaluation Board designed by Freescale
(KIT34716EPEVBE).
2
34716 Specification
The 34716 is a highly integrated, space-efficient,
low cost, dual synchronous buck switching
regulator with integrated N-channel power
MOSFETs. It is a high performance point-of-load
(PoL) power supply with its second output having
the ability to track an external reference voltage. it
provides a full power supply solution for
Double-Data-Rate (DDR) Memories.
Channel one provides a source only 5.0 A drive
capability, while channel two can sink and source
up to 3.0 A. Both channels are highly efficient with
tight output regulation. With its high current drive
capability, channel one can be used to supply the
VDDQ to the memory chipset. The second channel’s
© Freescale Semiconductor, Inc., 2007-2009. All rights reserved.
Contents
1
2
3
4
5
6
7
8
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
34716 Specification. . . . . . . . . . . . . . . . . . . . . 1
Application Diagram . . . . . . . . . . . . . . . . . . . . 2
Board’s Specifications . . . . . . . . . . . . . . . . . . 2
Component Selection for 34716 Eval Board. 3
Layout Design . . . . . . . . . . . . . . . . . . . . . . . . 12
Conclusion. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
References. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Application Diagram
ability to track a reference voltage makes it ideal to provide the termination voltage (VTT) for
modern data buses. The 34716 also provides a buffered output reference voltage (VREFOUT) to
the memory chipset.
3
Application Diagram
34716
3.0V to 6.0V VIN
CBOOT1
VDDQ
L1
R11
CO1
PVIN2
VIN
CIN
RS1
PVIN1
BOOT1
SW1
VOUT1
R21
RIH
VTT
L2
RS2
CX2
COMP1
PGND1
RFQH
FREQ
RFQH
RIL
CBOOT2
INV2
INV1
VDDI
CVDDI
VDDQ
R12
ILIM1
GND
COMP2
VREFOUT
PGND2
Termination
Resistors
CO2
CS2
CS1
RF1
CX1
CF1
VREFIN
BOOT2
SW2
VOUT2
VDDQ
RF2
DDR Memory
Chipset
CF2
CREF
Memory Bus
DDR Memory
Controller
VREF
VIN
1.0k
PG
Microcontroller
STBY
SD
Figure 1. Application diagram for 34716
4
Board’s Specifications
The Board was designed to have an operating range defined by:
Channel #1
Channel #2
VIN_MAX
6.0 V
VIN_MAX
6.0 V
VIN_MIN
3.0 V
VIN_MIN
3.0 V
VOUT_MAX
3.6 V
VOUT_MAX
1.35 V
VOUT_MIN
0.7 V
VOUT_MIN
0.7 V
IOUT_MAX
5.0 A
IOUT_MAX
3.0 A
IOUT_MIN
0.0 A
IOUT_MIN
-3.0 A
Using the 34716, Rev. 3.0
2
Freescale Semiconductor
Component Selection for 34716 Eval Board
5
5.1
Component Selection for 34716 Eval Board
I/O Parameters:
VIN = PVIN1 = 3.3V
FSW = 1 MHz
VOUT1 = VDDQ= 1.8 V (DDR2 Standard)
IOUT1 = 5 A
PVIN2 = VREFIN =VOUT1=1.8V
VOUT2 =VTT = 0.90 V
IOUT2 = 3A
5.2
Configuring the Output Voltage:
Channel 1 of the 34716 is a general purpose DC-DC converter, the resistor divider to the -INV1
node is the responsible for setting the output voltage. The equation is:
⎛ R1 ⎞
VOUT = V REF ⎜
+ 1⎟
⎝ R2 ⎠
Where VREF is the internal VBG=0.7V.
Then, for a regulated output at 1.8 V, we choose R1 = 20KΩ and R2 is calculated as follows:
R2 =
VREF R1
= 12.72 KΩ
VOUT − VREF
Channel 2 is a DDR specific voltage power supply, and the output voltage is given by the
equation:
VTT =
V REFIN
2
Where VREFIN is the VDDQ voltage supplied by VOUT1.
5.3
Switching Frequency Configuration
The switching frequency will have a value of 1.0 MHz by connecting the FREQ terminal to the
GND terminal. If the smallest frequency value of 200 KHz is desired, then connect the FREQ
terminal to VDDI. To program the switching frequency to another value, an external resistor
divider will be connected to the FREQ terminal to achieve the voltages given by the Frequency
Selection Table
Using the 34716, Rev. 3.0
Freescale Semiconductor
3
Component Selection for 34716 Eval Board
Frequency
Khz
Voltage applied to pin FREQ [V]
200
2.341 – 2.500
253
2.185 - 2.340
307
2.029 - 2.184
360
1.873 - 2.028
413
1.717 – 1.872
466
1.561 – 1.716
520
1.405 - 1.560
573
1.249 - 1.404
627
1.093 - 1.248
680
0.936 - 1.092
733
0.781 - 0.936
787
0.625 - 0.780
840
0.469 - 0.624
893
0.313 - 0.468
947
0.157 - 0.312
1000
0.000 - 0.156
Table 1. Frequency Selection Table
The EVB frequency is set to 1 MHz, connecting the FREQ terminal directly to GND.
Using the 34716, Rev. 3.0
4
Freescale Semiconductor
Component Selection for 34716 Eval Board
5.4
Selecting Inductor
Inductor calculation is as follows:
L = D'MAX ∗T ∗
D 'MAX = 1 −
(VOUT + I OUT * ( Rds (on) _ ls + r _ w))
∆I OUT
VOUT
Vin _ max
Maximum Off time percentage
T = 1µs
Switching period
Rds (on) _ ls = 45mΩ
Drain – to – source resistance of FET
r _ w = 10mΩ
Winding resistance of Inductor
∆I OUT = 0.4 * I OUT
Output current ripple
L1 = 0.72uH
L 2 = 0.75uH
However, since channel 1 will be serving as power supply for channel 2, we have to locate the
LC poles at different frequencies in order to ensure that the input impedance of the second
converter is always higher than the output impedance of the first converter, and thus, ensure
system stability. To move the LC poles, we can select different values of “L” for each channel, for
instance, L1 = 1.0µH and L2 = 1.5µH, to allow some operating margin for each channel.
5.5
Input Capacitors for PVIN1 and PVIN2
Input capacitor selection process is the same for both channels, and should be based on the
current ripple allowed on the input line, since output of channel 1 is the input of channel 2, the
input capacitor on channel 2 should be calculated for the maximum allowed output ripple on
channel 1. The input capacitor should provide the ripple current generated during the inductor
charge time. This ripple is dependent on the output current sourced by 34716 so that:
I RMS = I OUT D(1 − D)
Where:
IRMS
is the RMS value of the input capacitor current.
IOUT
is the output current,
D= VOUT/Vin
is the duty cycle.
For a buck converter, IRMS has its maximum at PVIN = 2VOUT
Using the 34716, Rev. 3.0
Freescale Semiconductor
5
Component Selection for 34716 Eval Board
Since
I RMS_MAX =
PMAX
ESR
Where PMAX is the maximum power dissipation of the capacitor and is a constant based on
physical size (generally given in the datasheets under the heading AC power dissipation.). We
derive that the lower the ESR, the higher would be the ripple current capability. In other words, a
low ESR capacitor (i.e., with high ripple current capability) can withstand high ripple current levels
without overheating.
Therefore, for greater efficiency and because the overall voltage ripple on the input line also
depends on the input capacitor ESR, we recommend using low ESR capacitors.
CinMIN =
0.5 * L * ( I RMS ) 2
∆VOUT *Vin
For a ∆VOUT = 0.5*Vin, Then CinMIN = 30.4µF
To ensure better performance on regulation, an array of low ESR ceramic capacitors were used
to get a total of 300 µF in both input terminals.
5.6
Selecting the Output Filter Capacitor
The following considerations are most important for the output capacitor and not the actual
Farad value: the physical size, the ESR of the capacitor, and the voltage rating.
Calculate the minimum output capacitor using the following formula:
C0 =
∆Iout
8 ∗ FSW ∗ ∆Vout
A more significative calculation must include the transient response in order to calculate the real
minimum capacitor value and assure a good performance.
Using the 34716, Rev. 3.0
6
Freescale Semiconductor
Component Selection for 34716 Eval Board
.
Transient Response percentage
Maximum Transient Voltage
TR_%
TR_V_dip = VOUT*TR_%
Maximum current step
∆Iout _ step =
(Vin _ min − Vout ) * D _ max
Fsw * L
Inductor Current rise time
dt _ I _ rise =
T * Iout
∆Iout _ step
Iout * dt _ I _ rise
TR _ V _ dip
To find the Maximum allowed ESR, the following formula was used:
∆Vout * Fsw * L
ESRmax =
Vout (1 − D min)
Co =
As a DDR specification, the ESR should be around 2 mΩ. To achieve this, an array of capacitors
in parallel were used, with 3 Low ESR Ceramic capacitors of 100 µF on each channel.
5.7
Bootstrap Capacitor
Freescale recommends a 0.1 µF capacitor for CBOOT1 and CBOOT2.
5.8
Compensation Network
Compensation network is calculated exactly in the same way for both channels. Since we are
using different values for L, the LC poles will be located at different frequencies to ensure stability
of the system when converter 1 is supplying the power voltage of converter 2.
1. Choose a value for R1 (May be equal for both channels)
2. Using a Crossover frequency of 100 kHz, set the Zero pole frequency to Fcross/10
FP 0 =
1
1
Fcross =
10
2π * R1C F
CF =
1
2π * R1 FPO
3. Knowing the LC frequency, the Frequency of Zero 1 and Zero 2 in the compensation
network are equal to FLC
FLC =
1
= FZ 1 = FZ 2
2π LX Co X
RF =
1
2π * C F FZ 1
FZ 1 =
1
2π * RF C F
CS =
FZ 2 =
1
2π * R1CS
1
2π * R1 FZ 2
Using the 34716, Rev. 3.0
Freescale Semiconductor
7
Component Selection for 34716 Eval Board
4. Calculate RS by placing the first pole at the ESR zero frequency.
FESR =
1
= FP1
2π * Co X * ESR
FP1 =
1
2π * RS C S
RS =
1
2π * FP1C S
5. Set the second pole at Crossover Frequency to achieve a faster response and a proper
phase margin.
FP 2 =
1
CX =
C F Cx
2π * RF
CF + Cx
CF
2π * RF C F FP 2 − 1
For Channel 1
For Channel 2
FLC = 9.19 KHz
FESR = 265.26 KHz (For ESR = 2.0mΩ)
FCROSS = 100 KHz
FPO = 10 KHz
FLC = 7.5 KHz
FESR = 265.26 KHz (For ESR = 2.0mΩ)
FCROSS = 100 KHz
FPO = 10 KHz
R1 = 20 KΩ
CF = 0.75 nF
RF = 22 KΩ
CS = 0.91 nF
RS = 0.560 KΩ
CX = 0.015 nF
R1 = 20 KΩ
CF = 1.8 nF
RF = 15 KΩ
CS = 1 nF
RS = 300 KΩ
CX = 0.020 nF
Figure 2. Compensation Network
Note: R2 only applies to Channel 1
Using the 34716, Rev. 3.0
8
Freescale Semiconductor
Component Selection for 34716 Eval Board
5.9
Soft Start
Table 2 shows the voltage that should be applied to the ILIM1 terminal to get the desired
configuration of the soft start timing. Channel 2 of the 34716 has a soft start of 1.6ms.
Soft Start [ms]
Voltage applied to ILIM
3.2
1.25 - 1.49V
1.6
1.50 - 1.81V
0.8
1.82 - 2.13V
0.4
2.14 - 2.50V
Table 2. Soft Start Configurations
The ILIM1 terminal is directly connected to VDDI to achieve a soft start of 0.4ms.
5.10
Tracking Configurations
The 34716 allows a default Ratiometric tracking on channel 2 by connecting VDDQ on the
VREFIN terminal. It has an internal resistor divider that allows an output of VDDQ/2.
Using the 34716, Rev. 3.0
Freescale Semiconductor
9
Component Selection for 34716 Eval Board
5.11
EVB Schematic Design.
VDDI
GND
FREQ
ILIM2
VIN
BOOT1
N/C
19
BOOT2
ILIM1
20
22
21
VIN
VIN
24
BOOT2
FREQ
1
GND
VDDI
26
STBY
C28
SW1
23
U2
BOOT1
25
BOOT1
ILIM1
ILIM1
STBY
FREQ
VDDI
VIN
ILIM2
C14
0.1uF
STBY
C15
BOOT2
18
SW2
0.1uF
0.1uF
PVIN1 2
PVIN1
PVIN2
17
2
PVIN1
PVIN2
17
PVIN2
SW2
16
SW2
PVIN2
PVIN1
SW1
SW1
3
SW1
SW2
MC34716
3
SW2
16
PGND1
PGND2
15
4
PGND1
PGND2
15
5
VOUT1
VOUT2
14
SW1
VO2
INV2
0.1uF
GND
C11
COMP2
COMP1
INV1
VO1
VREFIN
C27
/SHTD
4
/PGOOD
GND
VREFOUT
GND
0.1uF
INV1
PG
COMP1
12
13
COMP2
INV2
11
10
9
VREFOUT
SD
8
VREFIN
PG
7
INV1
6
VOUT2
COMP1
VOUT1
COMP2
INV2
SD
VREFIN
VREFOUT
C13
0.1uF
C12
0.1uF
COMPENSATION
NETWORK SW1
COMPENSATION
NETWORK SW2
VO1
VO2
C20
0.910nF
C23
1nF
R1
20k
INV1
C18
COMP1
R14
560
15pF
R15
COMP2
R18
300
20pF
C19
R4
20k
INV2
C21
R19
R2
C22
R17
12.7k
22k
17.4k_nopop
15k
0.75nF
BUCK CONVERTER 1
Vo1_1
1.8nF
BUCK CONVERTER 2
Vo1_2
Vo2_1
L1
SW1
1
SW2
1
1uH
D3
R20
4.7_nopop
PMEG2010EA_nopop
VO2_2
L2
VO1
2
VO2
2
1.5uH
C10
100uF
C24
100uF
C25
100uF
D2
R3
4.7_nopop
C6
100uF
C7
100uF
C8
100uF
PMEG2010EA_nopop
C26
1nF_nopop
C9
1nF_nopop
Figure 3. KIT34716EPEVBE Schematic Part 1
Using the 34716, Rev. 3.0
10
Freescale Semiconductor
Component Selection for 34716 Eval Board
I/O SIGNALS
VIN CAPACITORS
VIN
PVIN13
2
1
C17
10uF
C16
0.1uF
R7
1k
J3
PVIN2
VO2
GND
R8
10k
VMASTER
D1
LED
3
2
1
R9
10k
J4
VM
VM
LED
3
2
1
JUMPERS
ILIM1,ILIM2,FREQ
VO1
VMASTER
LED
STBY
1
2
1
2
1
3
5
7
9
2
4
6
8
10
VDDI
J1
VREFIN
R16
10k
PG
VDDI
VIN
GND
VDDI
VO1
VMASTER
VIN
J2
GND
PGOOD LED
R10
10k_nopop
STBY
R12
10k_nopop
SD
ILIM1
R22
10k_nopop
CON10A
SD
ILIM2
R13
10k_nopop
FREQ
R11
10k
PVIN1 CAPACITORS
PVIN2 CAPACITORS
PVIN1
PVIN2
C1
0.1uF
C2
1uF
C3
100uF
C4
100uF
C5
100uF
C30
0.1uF
C31
1uF
C32
100uF
C33
100uF
C29
100uF
TRIMPOTS nopop
VDDI
ILIM1
ILIM2
R21
R5
POT_50K_nopop
POT_50K_nopop
FREQ
R6
POT_50K_nopop
Figure 4. KIT34716EPEVBE Schematic Part 2
Using the 34716, Rev. 3.0
Freescale Semiconductor
11
Layout Design
6
Layout Design
Figure 5. PCB Top View Layout Design
Figure 6. PCB Bottom View Layout Design
Using the 34716, Rev. 3.0
12
Freescale Semiconductor
Layout Design
Figure 7. PCB Inner View Layout Design
6.1
•
•
•
•
•
•
•
•
•
•
•
PCB Layout Recommendations
Place decoupling capacitors as close as possible to their corresponding pad(s)
Try to place all components on just one Layer.
Do not place a Ground Plane on component and routing side.
Create a Ground plane layer and tie it to ground signals with vias.
To effectively transfer heat from the center thermal pad on the top layer to the ground plane,
vias need to be used in the center pad. Use 5 to 9 vias spaced evenly with a finished
diameter of 0.3mm.
Place Test vias as close as possible to the IC to ensure a good measurement value.
PVIN, VIN, VOUT signals have to be tracked with a widely and straight copper area
Never trace the Feedback signal in parallel to the SW signal.
Ensure the SW Inductor is placed as close as possible to its pads.
SW track has to be as thin and short as possible.
Make sure the I/O connectors are capable to manage the Load current.
Note: Freescale does not recommend connecting the PGND pins to the thermal pad.
The thermal pad is connected to the signal ground and should not be used to make the
connection from the PGND pins to the ground plane. Doing so can cause ground
bounce on the signal ground from the high di/dt switch current and parasitic
trace inductance.
Using the 34716, Rev. 3.0
Freescale Semiconductor
13
Layout Design
6.2
Bill of Materials
Table 3. BILL OF MATERIALS KIT34716
EVB Number: KIT34716EPEVBE
Item
Qty
Reference
Value
Description
Footprint
1
23
VOUT1,SW1,PVIN1,INV1,ILIM1,COMP1,
BOOT1,VOUT2,SW2,PVIN2,INV2,ILIM2,
COMP2,BOOT2,VREFOUT,VREFIN,VIN,
VDDI,STBY,SD,PG,GND,FREQ
not
populated
PC Test point
miniature SMT
TP
2
2
C2,C31
1.0µF
Cap Cer 1.0 µF 6.3V
10% X5R 0603
SM/C_0603
3
12
C3,C4,C5,C6,C7,C8,C10,C24,C25,C29,
C32,C33
100µF
Cap Cer 100 µF 6.3V
10% X5R 1210
SM/C_1210
4
2
C9,C26
not
populated
5
10
C1,C11,C12,C13,C14,C15,C16,C27,C28,
C30
0.1µF
Cap Cer 0.1 µF 50V
10% X7R 0603
SM/C_0603
6
1
C17
10µF
Cap Cer 10 µF 6.3V
20% X5R 0603
SM/C_0603
7
1
C18
15pF
Cap Cer 15pF 50V
1% C0G 0603
SM/C_0603
8
1
C19
750pF
Cap Cer 750pF 50V
5% C0G 0603
SM/C_0603
9
1
C20
910pF
Cap Cer 910pF 50V
5% C0G 0603
SM/C_0603
10
1
C21
20pF
Cap Cer 20pF 50V
5% C0G 0603
SM/C_0603
11
1
C22
1.8nF
Cap Cer 1800pF 50V
5% C0G 0603
SM/C_0603
12
1
C23
1.0nF
Cap Cer 1000pF 25V
5% C0G 0603
SM/C_0603
13
1
D1
LED
LED Green 0603
SMD
SM/C_0603
14
2
D2,D3
not
populated
15
1
J1
Pin Header
(2 x 5)
HDR 2X5 TH 100mil
CTR 330H AU
0.1" (2.54mm)
16
3
100mils jumpers
Jumpers
17
3
J2,J3,J4
not
populated
100mils
Using the 34716, Rev. 3.0
14
Freescale Semiconductor
Layout Design
18
1
J5
not
populated
19
1
L1
1.0µH
Inductor Power 1.0µH
7.5A SMD
B82464G
20
1
L2
1.5µH
Inductor Power 1.5µH
7.0A SMD
B82464G
21
2
R1,R4
20kΩ
Res MF 20kΩ 1/10W
1% 0603 SMD
SM/C_0603
22
1
R2
12.7kΩ
Res MF 12.7kΩ
1/10W 1% 0603 SMD
SM/C_0603
23
2
R3,R20
not
populated
24
3
R5,R6,R21
not
populated
25
1
R7
1kΩ
Res MF 1.0kΩ 1/10W
1% 0603
SM/C_0603
26
1
R10
10kΩ
Res MF 10kΩ 1/10W
1% 0603
SM/C_0603
27
3
R12,R13,R22
not
populated
28
4
R8,R9,R11,R16
10kΩ
Res MF 10kΩ 1/10W
1% 0603
SM/C_0603
29
1
R14
560Ω
Res MF 560Ω 1/10W
1% 0603
SM/C_0603
30
1
R15
22kΩ
Res MF 22kΩ 1/10W
5% 0603
SM/C_0603
31
1
R17
17.4kΩ
Res MF 17.4kΩ
1/10W 1% 0603
SM/C_0603
32
1
R18
300Ω
Res MF 300Ω 1/10W
5% 0603
SM/C_0603
33
1
R19
15kΩ
Res MF 15kΩ 1/10W
1% 0603
SM/C_0603
34
1
SD
Push_Button
Switch Tact Mini
200GF SLV Gwing
35
1
STBY
not
populated
Switch Tact Mini
200GF SLV Gwing
36
1
U2
MC34716
QFN_26
Notes: Freescale does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit
drawings or tables. While Freescale offers component recommendations in this configuration, it is the customer’s responsibility to validate
their application.
Using the 34716, Rev. 3.0
Freescale Semiconductor
15
Conclusion
7
Conclusion
With this User Guide, the user will be capable of configuring the 34716 as power supply for DDR
memory chips, as well as other devices that can make use of some of the capabilities that the
34716 offers. The board is fully configured to work at any desirable input voltage within 3.0 and
6.0 V. However, it is highly recommended to calculate all components for the specific application
situation in order to assure a better efficiency and stability of the IC.
8
References
•
•
•
34716 Datasheet, 3A and 5A 1MHz Fully Integrated Double Switch-mode Power Supply,
Freescale Semiconductor, Inc.
Application Note “AN1989 MC34701 and MC34702 Component Selection Guide”,
Freescale Semiconductor, Inc.
Sanjaya Maniktala, “Switching Power Supplies A to Z”, Newnes, 2006.
Using the 34716, Rev. 3.0
16
Freescale Semiconductor
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KT34716UG
Rev. 3.0
1/2009
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