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Multi-Phase Link Controller
POWER MANAGEMENT Description
The SC4201 is a multi-phase link controller, ideal for isolated and non-isolated applications. Its frequency of operation can be programmed in excess of 2MHz per phase (oscillator frequency = phase frequency times number of phases 3 or 4) and can be easily synchronized to an external faster frequency. The SC4201 output frequencies can be set to 2/4 or 3 phase operation. A single pin can either set a 4 phase operation (each phase is 90 degrees apart) or 3 phase operation (120 degrees apart). Multi-phase operation of multiple primary or secondary controllers reduces input/output ripple, the number of components required for filtering, and noise due to frequency beating generated by multiple free running oscillators. The SC4201 is available in the MSOP-8 surface mount package.
SC4201
Features
Small footprint MSOP-8 Programmable frequency > 2MHz, each phase Synchronized to faster frequency Programmable 2/4 or 3 phase operation
Applications
Telecom distributed power architectures Multi-phase operation of isolated power supplies Multi-phase operation of non-isolated switching regulators
Typical Application Circuit
+3 to 6V
C1 0.1
U1 SC4201 1 2 3 R1 5K 4 RT VDD SYNC A GND D C B 8 7 6 5
VDD for 3 Phase
Ph D Ph C Ph B Ph A
Sync
Revision: September 17, 2004
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SC4201
POWER MANAGEMENT Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
Parameter Supply Voltage RT, SYNC Operating Ambient Temperature Range Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 sec Thermal Impedance Junction to Ambient ESD Rating (Human Body Model)
Symbol VIN V P _K TA TJ TSTG TLEAD J A ESD
Limits 7 -0.3V to VDD +0.3 -40 to +125 -40 to 150 -65 to 150 +300 206 2
Units V V C C C C C/W kV
Electrical Characteristics
Unless specified: TA = T = -40 to +125C, V
I DD
= 5V, R = 100K, 4-phase.
T
Parameter Supply Voltage, Operating Supply Current VDD Start Threshold VDD UVLO Hysteresis Output Frequency, per phase Output Frequency Stability Phase Accuracy Sync Input Threshold O/P Rise Time O/P Fall Time Output Voltage Output Current (peak)
Symbol V DD IDD
Conditions
Min 3.0
Typ
Max 6.0
Units V mA V mV MHz % % V ns ns
VDD = 6V, RT = 36.5k , COUT = 20pF
2.35
2.60 3.10
70 FOUT See graphs, Fig 2 - 5 VDD = 3V to 6V By design, not tested VSYNC TR TF VOUT V D D = 5V IOUT VDD = 3.3V See pin description COUT = 20pF, VDD = 3V to 6V COUT = 20pF, VDD = 3V to 6V 0.1
100
130 2 10 1
VDD/3
10
10 V DD 25 10 60 (1)
V mA
Output Impedance Output Duration
ROUT TP
ns
Note: (1) TP = TOUT where TOUT = output signal period of individual phase. N N = 3 for 3 phase operation, N = 4 for 2/4 phase operation.
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SC4201
POWER MANAGEMENT Pin Configuration
Top View
Ordering Information
Part Number (1) SC4201IMSTRT(2) S C 4201E V B P ackag e MSOP-8 Evaluation Board
(MSOP-8)
Notes: (1) Only available in tape and reel packaging. A reel contains 2500 devices. (2) Lead free product. This product is fully WEEE and RoHS compliant.
Pin Descriptions
Pin 1 2 3 Pin Name RT VD D SYNC Pin Function Oscillator frequency is configured by connecting resistor R from RT to ground. Values for R can be selected to provide desired 3 phase or 4 phase output frequencies. The power input connection for the device. SYNC is a positive edge triggered input with a threshold of ~VDD/3. SYNC should be grounded when not required or connected to an external synchronization clock with frequency higher than the on board oscillator frequency (with respect to internal clock). SYNC frequency = phase frequency times number of phases 3 or 4. Logic level output clock. Phase "A", totem-pole type. Logic level output clock. Phase "B", totem-pole type. Logic level output clock. Phase "C", totem-pole type. Logic level output, totem-pole type, lock and phase selection pin. Default operation 4 phase/2 phase (90/180). Tie D to VDD to select 3 phase operation through A, B and C 120 out of phase. Reference ground and power ground for all functions.
4 5 6 7
A B C D
8
GND
Marking Information
yyww = Datecode (Example: 0012) xxxx = Semtech Lot # (Example: E901 xxxx = 01-1)
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SC4201
POWER MANAGEMENT Block Diagram
Figure 1
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SC4201
POWER MANAGEMENT Typical Characteristics
Phase Frequency vs. RT, 4-Phase Operation
Vdd = 6V
10000
Vdd = 3V
1000
Frequency, (kHz)
100 10 10 100 1000
RT, (kOhm)
Figure 2 Phase Frequency vs. RT, 3-Phase Operation
Vdd = 6V
10000
Vdd = 3V
1000
Frequency, (kHz)
100 10 10 100 1000
RT, (kOhm)
Figure 3
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SC4201
POWER MANAGEMENT Typical Characteristics (Cont.)
4-Phase
Figure 4 3-Phase
Figure 5
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SC4201
POWER MANAGEMENT Application Information
Diagram in Figure 6 shows multi-phase operation of several power converters with fixed switching frequency FSW.
VDD
+3 to 6V
Ph A
sync
PWM
L C
Vout1
= Fsw
SYNC
Ph B
sync
PWM
L C
Vout 2
= Fsw
RT
Ph C
sync
PWM
L C
Vout 3
= Fsw
GND
Ph D
PWM sync
L C
Vout 4
= Fsw
SC4201
optional 3 or 2/4 Phases
Figure 6
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SC4201
POWER MANAGEMENT Application Information (Cont.)
Diagram in Figure 7 demonstrates a multi-phase operation of a single power supply with current sharing through the individual phases and with fixed switching frequency FSW.
VDD
+3 to 6V
Ph A
sync
PWM
L
= Fsw
SYNC
Ph B
sync
PWM
L
= Fsw
Vout C
RT
Ph C
sync
PWM
L
= Fsw
GND
Ph D
PWM sync
L
= Fsw
SC4201
optional 3 or 2/4 Phases
Figure 7
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SC4201
POWER MANAGEMENT Application Information (Cont.)
Diagram in Figure 8 assumes variable switching frequency FSW, e.g. resonant power converters. This circuit will require additional "FSW Control" block, which is a task for a power designer.
VDD
+3 to 6V
Ph A
sync
PWM
L
~ Fsw
SYNC
Ph B
sync
PWM
L
~ Fsw
Vout C
Fsw control
RT
Ph C
sync
PWM
L
~ Fsw
GND
Ph D
sync
PWM
L
~ Fsw
SC4201
optional 3 or 2/4 Phases
Figure 8
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SC4201
POWER MANAGEMENT Application Information (Cont.)
Diagram in Figure 9 demonstrates a synchronous operation of two (or more) SC4201 controllers. If the "time delay" circuit is to be employed then 6-phase, 8-phase and other configurations become possible.
Power Section of choice
+3 to 6V
VDD
Ph A
sync
PWM
L
V DD
+3 to 6V
Ph A
~ Fsw
Time Delay
(optional)
SYNC
Ph B
sync
PWM
L
SYNC
Ph B
~ Fsw
Vout C
Fsw control
RT
Ph C
sync
PWM
L
RT
Ph C
~ Fsw
GND
Ph D
sync
PWM
L
GND
Ph D
~ Fsw
SC4201 - A
optional 3 or 2/4 Phases
SC4201 - B
Figure 9
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SC4201
POWER MANAGEMENT Evaluation Board Schematic
+3 to 6V R3 1k 3 Phase - 4 Phase
U1 SC4201 1 Run - Sync 2 VDD D 7 D Out RT GND 8
Sync J1
3
SYNC
C
6
C Out
4
A
B
5
B Out
R1 15k
C1 1.0
C2 0.1
R2 100K C3 22pF C4 22pF C5 22pF C6 22pF
A Out
Top View
Layout
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SC4201
POWER MANAGEMENT Outline Drawing - MSOP-8
e/2 A N 2X E/2 PIN 1 INDICATOR ccc C 2X N/2 TIPS 12 e B E1 E D
DIM
A A1 A2 b c D E1 E e L L1 N 01 aaa bbb ccc
DIMENSIONS MILLIMETERS INCHES MIN NOM MAX MIN NOM MAX
.043 .000 .006 .030 .037 .009 .015 .009 .003 .114 .118 .122 .114 .118 .122 .193 BSC .026 BSC .016 .024 .032 (.037) 8 0 8 .004 .005 .010 1.10 0.00 0.15 0.75 0.95 0.22 0.38 0.08 0.23 2.90 3.00 3.10 2.90 3.00 3.10 4.90 BSC 0.65 BSC 0.40 0.60 0.80 (.95) 8 0 8 0.10 0.13 0.25
aaa C SEATING PLANE
D A2 A GAGE PLANE 0.25
H c
C
A1 bxN bbb C A-B D
L (L1) DETAIL
01
A
SIDE VIEW
NOTES: 1.
SEE DETAIL
A
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MO-187, VARIATION AA.
Land Pattern - MSOP-8
X
DIM
(C) G Z C G P X Y Z
DIMENSIONS INCHES MILLIMETERS
(.161) .098 .026 .016 .063 .224 (4.10) 2.50 0.65 0.40 1.60 5.70
Y P
NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
Contact Information
Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
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