07/04/03
IRDCiP1202-A, 300kHz, Dual 15A, 5.5VIN to 13.2VIN Dual
Output Synchronous Buck Converter using iP1202
Overview
The iP1202 is fully optimized solution for medium current synchro-
nous buck applications requiring up to 15A or 30A. In this document,
Fig. 1 and 2 are provided to enable engineers to easily evaluate the
iP1202 in an independent and parallel configuration that is capable of
providing up to 15A per phase with double-sided heat sinking. Fig. 4, 5
and 6 and the complete bill of materials in Table 1 are provided as a
reference design to enable engineers to very quickly and easily design
a dual phase converter. In order to optimize this design to your
specific requirements, refer to the iP1202 data sheet for guidelines on
external component selection and user adjustable limits and specifi-
cations. Custom designs may require layout modifications.
Demoboard Quick Start Guide
Initial Settings:
•The output1 is set to 1.5V and output2 is set to 2.5V for independent configuration.
•The output1 is set to 1.5V with R4, R8, R10, R11 and R12 removed for parallel configuration.
•Output can be adjusted from 0.8V to 3.3V as follow:
1. VOUT1: R9=R13= R7 [(VOUT 1/ Vref) – 1]. Set R7=R14=1k,Vref=0.8V
2. VOUT2: R10=R11= R8 [(VOUT2 / Vref) – 1]. Set R8=R12=1k,Vref=0.8V.
•The switching frequency is set to R3=30.9k for 300kHZ
•The input voltage range can be increased to allow operation between 5.5VIN and 13.2VIN.
•For paralleled single output operation see Fig. 6 for configuration table in reference design
schematic.
Procedure for Connecting and Powering Up Demoboard:
1. Apply input voltage (5.5V-13.2V) across VIN and PGND
2. Apply load across VOUT1 pad and PGND pad and VOUT2 pad and PGND pad for independent
configuration.
3. Apply load across VOUT1 pad and PGND pad and short R27 for parallel configuration.
4. Adjust load accordingly.
IRDCiP1202-A Recommended Operating Conditions
(refer to the iP1202 datasheet for maximum operating conditions)
Input voltage: 5.5 - 13.2V
Output voltage: Can be set between 0.8V – 3.3V
Output current: Up to 15A (see recommended operating area Fig. 1, 2 and 3). The maximum current
should be limited to 11.5A if the PCB is the only heat sink.
Switching Freq: 200kHz to 400kHz selectable.
IRDCiP1202-A
International Rectifier • 233 Kansas Street, El Segundo, CA 90245 USA
R
EFERENCE
D
ESIGN
R
EFERENCE
D
ESIGN
www.irf.com2
IRDCiP1202-A
200
220
240
260
280
300
320
340
360
380
400
20 25 30 35 40 45 50
RT in KOhms
Switching Frequency in KHz
Fig. 2 : Per Channel Switching Frequency vs RT
Fig. 1: Nominal Overcurrent Threshold Setting External Resistor Selection for VIN = 12V
4
8
12
16
20
24
28
32
36
40
44
48
52
56
4 6 8 10 12 14 16 18 20 22 24
Overload Current (A)
ROC-SET (k:)
V
IN
= 12V
V
OUT1
= V
OUT2
= 1.5V
f
SW
= 300kHz
L = 1PH
T
BLK
= 125°C
www.irf.com 3
IRDCiP1202-A
V
IN
= 12V, V
OUT1
= 1.5V, V
OUT2
= 2.5V
70%
72%
74%
76%
78%
80%
82%
84%
86%
88%
90%
92%
123456789101112
Output Current(A)
Efficiency
200kHZ
300kHZ
400kHZ
Fig. 3 - Typical Efficiency vs. Current
Refer to the following application notes for detailed guidelines and suggestions when implementing
iPOWIR Technology products:
AN-1028: Recommended Design, Integration and Rework Guidelines for International Rectifier’s
iPOWIR Technology BGA Packages
This paper discusses the assembly considerations that need to be taken when mounting iPOWIR BGA’s
on printed circuit boards. This includes soldering, pick and place, reflow, inspection, cleaning and
reworking recommendations.
AN-1029: Optimizing a PCB Layout for an iPOWIR Technology Design
This paper describes how to optimize the PCB layout design for both thermal and electrical performance.
This includes placement, routing, and via interconnect suggestions.
AN-1030: Applying iPOWIR Products in Your Thermal Environment
This paper explains how to use the Power Loss and SOA curves in the data sheet to validate if the
operating conditions and thermal environment are within the Safe Operating Area of the iPOWIR product.
AN-1047: Graphical solution to two branch heatsinking Safe Operating Area
This paper is a suppliment to AN-1030 and explains how to use the double side Power Loss and SOA
curves in the data sheet to validate if the operating conditions and thermal environment are within the Safe
Operating Area of the iPOWIR product.
www.irf.com4
IRDCiP1202-A
VIN
SS1
VP-R EF
PGN D
CC1
FB1
VSW1
HICCUP
FB1S
VSW2
FB2
CC2
ENABLE
PGOOD
SS2
RT
SYNC
VREF
FB2S
OC1
OC2
iP1202
VIN
SS1
VP-R EF
PGN D
CC1
FB1
VSW1
HICCUP
FB1S
VSW2
FB2
CC2
ENABLE
PGOOD
SS2
RT
SYNC
VREF
FB2S
OC1
OC2
C4
33uF
C3
33uF
C2
33uF
C1
33uF
16V 16V 16V 16V
TP1
VIN
TP2
PGND
C8
0.1uF
SS1
L1
1uH
TP8
VSW1
C12
470uF C13
470uF C14
0.1uF
TP12
PGND
6.3V 6.3V
R9
887 1%
R7
1K 1%
FB1
C9
0.018uF R5
2.49K
CC1
R15
5mOHM
R16
0
C15
470uF C17
0.1uF
L2
1uH
R10
2.15k 1%
R8
1k 1%
TP10
VSW2
C16
470uF
C11
0.012uF
TP14
PGND
R6
3.32K
6.3V 6.3V
VSW2
FB2
CC2
R19
5mOHM
R17
0
ENABLE
PGOOD
TP6
SYNC
VSW1
VIN
VP-REF
C7
0.1uF
SS2
R3
30.9K
C10
100pF
HICCUP
R1
100K
R2
100K
R13
887 1%
R14
1K 1%
R11
2.15K 1%
R12
1K 1%
0.8V
TP11
VOUT1
TP13
VOUT2
FB1S
VREF
FB2S
RT
SYNC
D es igna t or Independe nt mode(dual output) 2 phase mode(single output)
R16
R17
R8
R10
Removed
Removed
Inst alled
Inst alled
Installed
Installed
Removed
Removed
Output Configuration
R4 Installed Removed
R15, R19 Short 5mOHM
†
**For independent mode, output voltages are set by using the following equations:
For VOUT1:
Set R7 (or R8) t o 1K, VREF to 0.8V, and VOUT to desired output, then solve for R9 (or R10 resp ectively ).
R9 = R7[(VOUT1/ VREF) - 1].
For VOUT2:
R10 = R8[(VOUT2/VREF) - 1].
For parallel (single output) mode, check table on the left.
†
†
†
†
†
†
**
**
R4
0
†
2 1
JP1
HICCUP
2 1
JP3
ENABLE
VIN
VIN
ROC1
51.1K 1%
ROC2
51.1K 1%
OC1
OC2
TP28
VIN
TP29
PGND
TP15
VOUT1
TP16
PGND
TP17
VOUT2
TP18
PGND
(1.5V)
(2.5V)
VOUT1
VOUT2
VSW1S
VSW2S
TP20
VOUT1
TP22
PGND
TP3
VIN
TP4
PGND
R22
0
FB1S
R11 R12 Inst alled Removed
R22 Removed Installed
C18
NI
C19
NI
C20
NI
C21
NI
R23
NI R24
NI
R25
NI R26
NI
C23
33uF
C22
33uF
16V 16V
C24
NI
C25
NI
C26
100pF
C27
100pF
Typ e III Comp ensat ion
***
***
*** ***
***
***
*** ***
***NI: Not Installed
R27
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
CON4
INPUT/OUTPUT
ENABLE
VINS
PGNDS
VSW1S
VSW2S
VOUT1
VOUT2
JP1-1
SHUNT
JP3-1
SHUNT
(short for independent
output configuration)
(short for independent
output configuration)
R27
0
†
††
Des ignator Type II Configuration Type III Configuration
C18, C19
C20, C21
C9, C11
R5, R6
Removed
Removed
Installed
Installed
Installed
Installed
Installed
Removed
Compensation Configuration
Installed
R23, R24, R25, R26 Removed
††
Fig. 4 - Reference Design Schematic
www.irf.com 5
IRDCiP1202-A
Fig. 5 - Component Placement (Top View) SideLayer
Fig. 6 - Component Placement (Bottom View)
www.irf.com6
IRDCiP1202-A
Table 1 - Reference Design Bill of Materials
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: ++ 1 310 252 7105
Technical Assistance Center (TAC) Fax : ++ 1 310 252 7903
Use of this design for any application should be fully verified by the customer.
International Rectifier cannot guarantee suitability for your applications, and is not
liable for any result of usage for such applications including, without limitation,
personal or property damage or violation of third party intellectual property rights.
IRDCiP1202-A (Single, paralleled output configuration(for 1.5V output)
IRDCiP1202-A (Dual, Independent output configurations(Channel1 1.5V output, Channel2 2.5V output)
QTY REF DESIGNATOR DESCRIPTION SIZE MFR PART NUMBER
6 C1, C2, C3, C4, C22, C23 Capacitor, ceramic, 33µF, 16V, X5R, 20% 1812 TDK C4532X5R1C336MT
4 C7, C8, C14, C17 Ca
p
acitor, ceramic, 0.1
µ
F, 50V, X7R, 10% 0603 TDK C1608X7R1H104K
1 C11 Capacitor, ceramic, 0.012uF, 50V, X7R, 10% 0603 Ph
y
comp 06032R123K8B20
4 C12, C13, C15, C16 Capacitor, poscap, 470µF, 6.3V, electrol
y
tic 20% 7343 San
y
o 6TPB470M
3 C10, C26, C27 Ca
p
acitor, ceramic, 100
p
F, 50V, NPO, 5% 0603 Ph
y
com
p
0603CG101J9B20
1C9Ca
p
acitor, ceramic, 0.018uF, 25V, X7R, 10% 0603 Ph
y
com
p
06032R183K8B20
2 L1, L2 Inductor, 1µH, 19A, 20% 13.0mm X 12.9mm Panasonic ETQP1H1R0BFA
2 R13, R9 Resistor, thick film, 887Ω, 1/10W, 1% 0603 KOA RK73H1J8870F
2 R10, R11 Resistor, thick film, 2.15kΩ, 1/10W, 1% 0603 KOA RK73H1J2151F
4 R7, R8, R12, R14 Resistor, thick film, 1.0kΩ, 1/10W, 1% 0603 KOA RK73H1J1001F
2ROC1,ROC2 Resistor, thick film, 51.1kΩ, 1/10W, 1% 0603 KOA RK73H1J5112F
2 R15, R19 Resistor, man
g
anin-foil, 0Ω, 2W 2716 Isotek Corp SMT-R000
1 R4 Resistor, thick film, 0Ω, 1/10W, 5% 0603 ROHM MCR03EZHJ000
14
C18, C19, C20, C21, C24,
C25, R16, R17, R22, R23,
R24, R25, R26, R27
Not installed - - -
2R1, R2 Resistor, thick film, 100kΩ, 1/10W, 1% 0603 KOA RK73H1J1003F
1R5 Resistor, thick film, 2.49kΩ, 1/10W, 1% 0603 KOA RK73H1J2491F
1R6 Resistor, thick film, 3.32kΩ, 1/10W, 1% 0603 KOA RK73H1JLTD3321F
1R3 Resistor, thick film, 30.9kΩ, 1/10W, 1% 0603 KOA RK73H1J3092F
1 U1 BGA Power Block 9.25mm X 15.5mm IR iP1202
QTY REF DESIGNATOR DESCRIPTION SIZE MFR PART NUMBER
6 C1, C2, C3, C4, C22, C23 Capacitor, ceramic, 33µF, 16V, X5R, 20% 1812 TDK C4532X5R1C336MT
4 C7, C8, C14, C17 Ca
p
acitor, ceramic, 0.1
µ
F, 50V, X7R, 10% 0603 TDK C1608X7R1H104K
1 C11Ca
acitor, ceramic, 0.012uF, 50V, X7R, 10% 0603 Ph
y
com
p
06032R123K8B20
4 C12, C13, C15, C16 Ca
p
acitor,
p
osca
p
, 470
µ
F, 6.3V, electrol
y
tic 20% 7343 San
y
o 6TPB470M
3 C10, C26, C27 Capacitor, ceramic, 100pF, 50V, NPO, 5% 0603 Ph
y
comp 0603CG101J9B20
1 C9 Capacitor, ceramic, 0.018uF, 25V, X7R, 10% 0603 Ph
y
comp 06032R183K8B20
2 L1, L2 Inductor, 1µH, 19A, 20% 13.0mm X 12.9mm Panasonic ETQP1H1R0BFA
2R13, R9 Resistor, thick film, 887Ω, 1/10W, 1% 0603 KOA RK73H1J8870F
2R7, R14 Resistor, thick film, 1.0kΩ, 1/10W, 1% 0603 KOA RK73H1J1001F
2 ROC1,ROC2 Resistor, thick film, 51.1kΩ, 1/10W, 1% 0603 KOA RK73H1J5112F
2R15, R19 Resistor, allo
y
metal, 5mΩ, 1W, 1% 2512 Panasonic ERJM1WSF5M0U
1R27 Resistor, man
g
anin-foil, 0Ω, 2W 2716 Isotek Corp SMT-R000
3 R16, R17, R22 Resistor, thick film, 0Ω, 1/16W 0603 ROHM MCR03EZHJ000
15
C18, C19, C20, C21, C24,
C25, R10, R11, R12, R4,
R8, R23, R24, R25, R26
Not installed - - -
2R1, R2 Resistor, thick film, 100kΩ, 1/10W, 1% 0603 KOA RK73H1J1003F
1R5 Resistor, thick film, 2.49kΩ, 1/10W, 1% 0603 KOA RK73H1J2491F
1R6 Resistor, thick film, 3.32kΩ, 1/10W, 1% 0603 KOA RK73H1JLTD3321F
1R3 Resistor, thick film, 30.9kΩ, 1/10W, 1% 0603 KOA RK73H1J3092F
1 U1 BGA Power Block 9.25mm X 15.5mm IR iP1202