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SC4201
POWER MANAGEMENT Pin Configuration
Top View
Ordering Information
Part Number (1) SC4201IMSTR S C 4201E V B P ackag e MSOP-8 Evaluation Board
Note: (1) Only available in tape and reel packaging. A reel contains 2500 devices. (MSOP-8)
Pin Descriptions
Pin 1 Pin Name RT 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.
[ FOUT {1.25 /(15pF x Rt )]/ phase}
2 3 VD D SYNC The power input connection for the device. SYNC is a positive edge triggered input with a threshold of 1.5V. 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). Logic level output clock. Phase "A". Logic level output clock. Phase "B". Logic level output clock. Phase "C". Logic level output clock 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 8
A B C D GND
Block Diagram
2002 Semtech Corp.
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SC4201
POWER MANAGEMENT Application Information
Diagram in Figure 1 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 1
2002 Semtech Corp.
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SC4201
POWER MANAGEMENT Application Information (Cont.)
Diagram in Figure 2 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 2
2002 Semtech Corp.
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SC4201
POWER MANAGEMENT Application Information (Cont.)
Diagram in Figure 3 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 3
2002 Semtech Corp.
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SC4201
POWER MANAGEMENT Application Information (Cont.)
Diagram in Figure 4 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 4
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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
2002 Semtech Corp.
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SC4201
POWER MANAGEMENT Outline Drawing - MSOP-8
Land Pattern - MSOP-8
Contact Information
Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
2002 Semtech Corp. 9 www.semtech.com

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