SC4201 Datasheet

SC4201
Multi-Phase Link Controller
POWER MANAGEMENT
Description
Features
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).
‹
‹
‹
‹
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 multiple primary or secondary ‹ Multi-phase operation of non-isolated switching
regulators
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.
Typical Application Circuit
+3 to 6V
C1
0.1
VDD for 3 Phase
U1
SC4201
Sync
R1
5K
GND
8
VDD
D
7
Ph D
3
SYNC
C
6
Ph C
4
A
B
5
Ph B
1
RT
2
Ph A
Revision: September 17, 2004
1
www.semtech.com
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
Symbol
Limits
Units
VIN
7
V
V P _K
-0.3V to VDD +0.3
V
Operating Ambient Temperature Range
TA
-40 to +125
°C
Junction Temperature Range
TJ
-40 to 150
°C
Storage Temperature Range
TSTG
-65 to 150
°C
Lead Temperature (Soldering) 10 sec
TLEAD
+300
°C
θJ A
206
°C/W
ESD
2
kV
Supply Voltage
RT, SYNC
Thermal Impedance Junction to Ambient
ESD Rating (Human Body Model)
Electrical Characteristics
Unless specified: TA = T = -40 to +125°C, V
I
Parameter
DD
= 5V, R = 100K, 4-phase.
T
Symbol
Supply Voltage, Operating
V DD
Supply Current
IDD
Conditions
Min
Typ
Max
Units
6.0
V
2.60
mA
3.10
V
130
mV
2
MHz
VDD = 3V to 6V
10
%
By design, not tested
1
%
3.0
VDD = 6V, RT = 36.5kΩ , COUT = 20pF
2.35
VDD Start Threshold
VDD UVLO Hysteresis
Output Frequency, per phase
70
FOUT
Output Frequency Stability
Phase Accuracy
See graphs, Fig 2 - 5
100
0.1
VSYNC
See pin description
VDD/3
V
O/P Rise Time
TR
COUT = 20pF, VDD = 3V to 6V
10
ns
O/P Fall Time
TF
COUT = 20pF, VDD = 3V to 6V
10
ns
Output Voltage
VOUT
Sync Input Threshold
Output Current (peak)
IOUT
Output Impedance
Output Duration
V DD
V D D = 5V
25
VDD = 3.3V
10
V
mA
ROUT
60
Ω
TP
(1)
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.
 2004 Semtech Corp.
2
www.semtech.com
SC4201
POWER MANAGEMENT
Pin Configuration
Ordering Information
Part Number (1)
P ackag e
SC4201IMSTRT(2)
MSOP-8
S C 4201E V B
Evaluation Board
Top View
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.
(MSOP-8)
Pin Descriptions
Pin
Pin Name
Pin Function
1
RT
2
VD D
The power input connection for the device.
3
SYNC
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.
4
A
Logic level output clock. Phase "A", totem-pole type.
5
B
Logic level output clock. Phase "B", totem-pole type.
6
C
Logic level output clock. Phase "C", totem-pole type.
7
D
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.
8
GND
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.
Reference ground and power ground for all functions.
Marking Information
yyww = Datecode (Example: 0012)
xxxx = Semtech Lot # (Example: E901
xxxx =
01-1)
 2004 Semtech Corp.
3
www.semtech.com
SC4201
POWER MANAGEMENT
Block Diagram
Figure 1
 2004 Semtech Corp.
4
www.semtech.com
SC4201
POWER MANAGEMENT
Typical Characteristics
Phase Frequency vs. RT, 4-Phase Operation
Vdd = 6V
Vdd = 3V
10000
Frequency, (kHz)
1000
100
10
10
100
1000
RT, (kOhm)
Figure 2
Phase Frequency vs. RT, 3-Phase Operation
Vdd = 6V
Vdd = 3V
10000
Frequency, (kHz)
1000
100
10
10
100
1000
RT, (kOhm)
Figure 3
 2004 Semtech Corp.
5
www.semtech.com
SC4201
POWER MANAGEMENT
Typical Characteristics (Cont.)
4-Phase
Figure 4
3-Phase
Figure 5
 2004 Semtech Corp.
6
www.semtech.com
SC4201
POWER MANAGEMENT
Application Information
Diagram in Figure 6 shows multi-phase operation of several power converters with fixed switching frequency
FSW.
VDD
Ph A
sync
+3 to 6V
= Fsw
SYNC
Ph B
sync
C
Ph C
sync
C
Ph D
Vout 3
L
PWM
= Fsw
GND
Vout 2
L
PWM
= Fsw
RT
Vout1
L
PWM
C
PWM
Vout 4
L
sync
= Fsw
C
optional 3 or 2/4 Phases
SC4201
Figure 6
 2004 Semtech Corp.
7
www.semtech.com
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
Ph A
PWM
sync
+3 to 6V
L
= Fsw
SYNC
Ph B
PWM
sync
L
= Fsw
Vout
C
RT
Ph C
PWM
sync
L
= Fsw
GND
Ph D
PWM
L
sync
= Fsw
optional 3 or 2/4 Phases
SC4201
Figure 7
 2004 Semtech Corp.
8
www.semtech.com
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
Ph A
sync
+3 to 6V
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
optional 3 or 2/4 Phases
SC4201
Figure 8
 2004 Semtech Corp.
9
www.semtech.com
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
Ph A
+3 to 6V
~ Fsw
Time Delay
(optional)
SYNC
Ph B
sync
PWM
L
SYNC
Ph B
RT
Ph C
GND
Ph D
~ Fsw
Vout
C
Fsw control
RT
Ph C
sync
PWM
L
~ Fsw
GND
Ph D
sync
PWM
L
~ Fsw
SC4201 - A
optional 3 or 2/4 Phases
SC4201 - B
Figure 9
 2004 Semtech Corp.
10
www.semtech.com
SC4201
POWER MANAGEMENT
Evaluation Board Schematic
3 Phase - 4 Phase
+3 to 6V
R3
1k
U1
SC4201
1
RT
GND
8
2
VDD
D
7
D Out
3
SYNC
C
6
C Out
4
A
B
5
B Out
Run - Sync
Sync
J1
R1
15k
C1
1.0
C2
0.1
A Out
R2
100K
C3
22pF
C4
22pF
C5
22pF
C6
22pF
Top View
Layout
 2004 Semtech Corp.
11
www.semtech.com
SC4201
POWER MANAGEMENT
Outline Drawing - MSOP-8
e/2
DIM
A
A
A1
A2
b
c
D
E1
E
e
L
L1
N
01
aaa
bbb
ccc
D
N
2X E/2
E1
PIN 1
INDICATOR
ccc C
2X N/2 TIPS
E
1 2
e
B
D
aaa C
A
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
c
GAGE
PLANE
A1
bxN
bbb
C A-B D
C
.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
H
A2
SEATING
PLANE
DIMENSIONS
MILLIMETERS
INCHES
MIN NOM MAX MIN NOM MAX
0.25
L
DETAIL
SEE DETAIL
SIDE VIEW
01
(L1)
A
A
NOTES:
1.
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
C
G
P
X
Y
Z
Z
Y
DIMENSIONS
INCHES
MILLIMETERS
(.161)
.098
.026
.016
.063
.224
(4.10)
2.50
0.65
0.40
1.60
5.70
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
 2004 Semtech Corp.
12
www.semtech.com