SEMTECH SC220

SC220
20MHz, 650mA, X-EMI™-Enabled
Synchronous Step-Down Regulator
POWER MANAGEMENT
Features
Description

Patented X-EMITM Inductor Technology
 Enables Trace Inductors in PC Board Material
 Excellent EMI Performance
Efficiency up to 90%
19μA Quiescent Current under Very Light-load
Wide Input Voltage Range — 2.7V to 5.5V
Adjustable Output Voltage Down to 1.0V
Output DC Current — up to 650mA
High Light-load Efficiency via Automatic PSAVE Mode
Ultra-fast Transient Response — <1μs
Temperature Range — -40 to +85°C
Shutdown Current — 0.1μA (typical)
Requires Tiny 220nH Inductor
Requires Only 1μF of Output Capacitance
External Switching Frequency Synchronization
Protection Features Including
 Over-Current Protection
 Output Short-Circuit Protection
 Thermal Shutdown Protection
Offered in SOIC 8 Lead Package

Lead-free, Halogen-free, and RoHS/WEEE Compliant

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Applications

HDTV, Set Top Boxes, Gaming Consoles
POL Applications
 White Goods
 Automotive (EMI sensitive console applications)
The SC220 is a 20MHz X-EMI™(1)-enabled step-down regulator optimized for powering low voltage rails from 2.7 to
5.5V input voltage. X-EMI™ inductor technology enables
inductors to be drawn directly on the PC board. This technology meets or exceeds the EMI performance of chip
inductors and eliminates the need for discrete inductors.
The SC220 uses a unique constant frequency, self-oscillating control loop architecture to provide excellent
transient performance. Under light load condition, the
device operates in Power Save Mode (PSAVE) and maintains a typical quiescent current of 19μA. At moderate to
heavy loads, this part operates in PWM mode with a constant switching frequency of 20MHz. This high switching
frequency offers the advantages of using small and low
cost external components like a 1μF external capacitor
and a small 220nH inductor (including X-EMITM PCB trace
inductors).
The device provides adjustable output voltages down to
1.0V and an output current up to 650mA. An EN pin can
be used to synchronize to an external source and includes
de-glitching to reduce noise sensitivity.
The SC220 is available in SOIC 8 lead package.

Note 1: Purchase of SC220 includes royalty-free rights to use X-EMITM
inductor technology with no additional cost.
Typical Application Circuit
L , 2 2 0n H
V IN
P V IN
2.7 ~ 5.5 V
SW
A V IN
VOUT
C IN
1 μF
R1
SC220
EN
E n a b le
V O U T = 1.8 V
u p to 6 5 0m A
PGND
C OUT
1 μF
FB
R2
AGND
January 25, 2012
1
SC220
Pin Configuration
Ordering Information
SW
1
8
PGND
P V IN
2
7
AGND
VOUT
3
6
A V IN
FB
4
5
EN
Device
Package
SC220STRT (1)(2)
SOIC 8 Lead
SC220EVB
Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 2,500 devices.
(2) Device is lead-free, halogen-free, and RoHS/WEEE compliant.
SOIC 8 Lead, θJA = 38 °C/W
Marking Information
nnnnn = Part Number
yyww = Date Code
xxxxx = Semtech Lot Number
2
SC220
Absolute Maximum Ratings (1)
Recommended Operating Conditions
AVIN, PVIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0
Input Voltage Range (V) . . . . . . . . . . . . . . . . . . . . . +2.7 to +5.5
VOUT, FB, EN, SW (V) . . . . . . . . . . . . . . . . . . . . .-0.3 to (VIN +0.3)
Output DC Current (mA). . . . . . . . . . . . . . . . . . . . . up to 650
AGND (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3
Operating Temperature Range (°C) . . . . . . . . . . -40 to +85
(2)
to
+0.3
ESD Protection Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kV
Thermal Information
Thermal Resistance, Junction to Ambient(3) (°C/W)....38
Junction Temperature Range (°C) . . . . . . . . . . -40 to +150
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . . . 260
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not recommended.
Notes:
(1) All voltage values in this section are with respect to PGND pin voltage.
(2) Tested according to JEDEC standard JESD22-A114-B.
(3) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Unless otherwise specified: AVIN = PVIN = EN = 3.6V, CIN = COUT = 1.0μF, L = 220nH. TA = 25°C for typical values, -40°C < TA = TJ < 85°C for minimum
and maximum values.
Parameter
Symbol
Condition
Min
Typ
Max
Units
5.5
V
40
μA
1.0
μA
POWER SUPPLY
Input Voltage
2.7
VIN
Input Quiescent Current
IVIN_Q
No load, no switching
Shutdown Current
IVIN_SD
EN = 0V
19
POWER SWITCH
PMOS On Resistance
400
mΩ
NMOS On Resistance
360
mΩ
OSCILLATOR
Switching Frequency
fOSC
PWM Mode
16
20
24
MHz
REGULATION
Output Voltage Tolerance(1)
Current Limit
VOUT_TOL
-4.0
4.0
%
ILIMIT
850
1300
mA
Soft-Start(1)
tSS
EN pin low to high
Feedback Voltage
VFB
2.7V ≤ VIN ≤ 5.5V
40
0.97
1.00
μs
1.03
V
3
SC220
Electrical Characteristics (continued)
Unless otherwise specified: AVIN = PVIN = EN = 3.6V, CIN = COUT = 1.0μF, L = 220nH. TA = 25°C for typical values, -40°C < TA = TJ < 85°C for minimum
and maximum values.
Parameter
Feedback Leakage Current
Symbol
Condition
Min
Typ
IFB
Max
Units
1
μA
ENABLE
1.2
EN Input High Voltage Threshold
VENH
EN Input “Low” Voltage Threshold
VENL
EN Input High Current
IENH
VEN = VIN
EN Input Low Current
IENL
VEN = AGND
fSYN_MIN
Square wave applied at EN pin
Minimum Synchronization Frequency
V
0.4
V
-1.0
1.0
μA
-1.0
1.0
μA
3
MHz
PROTECTION
Over Temp Thermal Shutdown(1)
TOT
150
°C
Thermal Shutdown Hysteresis(1)
THYST
15
°C
Notes
(1) Guaranteed by design. Not tested in production.
4
SC220
Pin Descriptions
Pin #
Pin Name Pin Function
1
SW
Switching output node — connect to the output LC filter.
2
PVIN
Power input supply voltage (2.7V to 5.5V).
3
VOUT
Input for sensing the output of LC filter.
4
FB
Input for regulation of output LC filter — Using R1 and R2 to set the output voltage, VOUT = VFB x (1+ R1/R2). (Please refer
to the typical application circuit diagram on page 1).
5
EN
Enable Input — when low, circuit draws <1μA. Apply a square wave clock at EN to synchronize the switching frequency
with an external clock. It is recommended that the externally applied clock frequency should not be above 20MHz.
6
AVIN
Input supply voltage.
7
AGND
Analog ground.
8
PGND
Power ground.
Block Diagram
EN
1.0V
REF
8
T herm al
S hutdow n
1 .0 V
FB
1
+
E rror
Amp
-
P V IN
7
3
OSC
S oft- S tart
20 M H z
E x ternal F req .
S y nc hroniz ation
A V IN
C LIM
F requenc y
C ontrol
+
C om p
-
C ontrol Logic
D riv er
4 SW
ZC D
C om pens ator
6
2 VOU T
5
AGN D
PGN D
5
SC220
Typical Characteristics
Efficiency vs. Load Current
VOUT = 1.8V
VOUT = 1.8V
100 %
VIN = 3.7V
VIN = 2.7V
90 %
80 %
70 %
70 %
Efficiency
80 %
60 %
VIN = 4.2V
50 %
40 %
40 %
30 %
20 %
10 %
10 %
0.01
0.1
Load Current (A)
IOUT = 1mA
50 %
30 %
0.001
IOUT = 50mA
60 %
20 %
0
IOUT = 300mA
100 %
90 %
Efficiency
Efficiency vs. VIN
0
2.5
1
3.0
Efficiency vs. Load Current
3.5
4.0
Input Voltage (V)
4.5
5.0
Load Regulation
(Chip Inductor vs. X-EMITM Inductor)
Nominal VOUT = 1.8V
VOUT = 1.8V
100 %
1.80
VIN = 2.7V
90 %
VIN = 3.7V
Output Voltage (V)
80 %
Efficiency
70 %
60 %
50 %
VIN = 4.2V
40 %
VIN = 5.0V
1.79
VIN = 4.2V
1.78
VIN = 2.7V
30 %
VIN = 3.7V
20 %
Dashed Lines: Efficiency with X-EMITM Inductor
Solid Lines: Efficiency with chip Inductor
10 %
0
0.01
0.1
Load Current (A)
0.001
1.77
1
0.1
1
Switching Frequency vs. VIN
Switching Frequency vs. VIN
VOUT = 1.0V
VOUT = 1.8V
22.5
22.5
IOUT = 200mA
20.0
Switching Frequency (MHz)
20.0
Switching Frequency (MHz)
0.01
Load Current (A)
0.001
17.5
15.0
12.5
IOUT = 300mA
10.0
7.5
IOUT = 450mA
5.0
IOUT = 200mA
17.5
IOUT = 300mA
15.0
IOUT = 650mA
12.5
IOUT = 450mA
10.0
7.5
5.0
2.5
2.5
IOUT = 650mA
0
0
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
5.0
5.5
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
5.0
5.5
6
SC220
Typical Characteristics (Continuous)
Load Transient Response
Load Transient Response
VIN = 3.7V, VOUT = 2.0V, IOUT = 0mA - 650mA
VOUT (ac coupled)
VIN = 3.7V, VOUT = 2.0V, IOUT = 200mA - 500mA
VOUT (ac coupled)
100mV/div.
50mV/div.
IOUT
IOUT
200mA/div.
200mA/div.
Time (1μs/div)
Time (1μs/div)
Steady State Operation (IOUT = 300mA)
Steady State Operation (IOUT = 50mA)
VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA
VIN = 3.6V, VOUT = 1.8V, IOUT = 300mA
IOUT
IOUT
50mA/div.
200mA/div.
IL
200mA/div.
IL
200mA/div.
VSW
VSW
2V/div.
2V/div.
Time (200ns/div)
Time (50ns/div)
Output Hard Short
Input Quiescent Current vs. Temperature
VIN = 5.5V, EN = High, FB = High
VIN = 5.0V, VOUT = 1.8V, IOUT = 650mA
20.0
Quiescent Current (μA)
VOUT
1V/div.
IL
500mA/div.
19.5
19.0
18.5
IOUT
500mA/div.
18
Time (500ns/div)
-40
-20
0
20
40
60
Temperature (°C)
80
100
7
SC220
Typical Characteristics (Continuous)
Disable Operation
Start-up Operation
VIN = 3.7V, VOUT = 1.8V, IOUT = 10mA
VIN = 3.7V, VOUT = 1.8V, IOUT = 10mA
EN
EN
5V/div.
5V/div.
VIN
VIN
2V/div.
2V/div.
VOUT
VOUT
1V/div.
1V/div.
IOUT
IOUT
10mA/div.
10mA/div.
Time (20μs/div)
Time (100μs/div)
Start-up Operation
Disable Operation
VIN = 3.7V, VOUT = 1.8V, IOUT = 650mA
VIN = 3.7V, VOUT = 1.8V, IOUT = 650mA
EN
EN
5V/div.
5V/div.
VIN
VIN
2V/div.
2V/div.
VOUT
VOUT
1V/div.
1V/div.
IOUT
IOUT
500mA/div.
500mA/div.
Time (20μs/div)
Time (20μs/div)
8
SC220
Applications Information
General Description
The SC220 is a step-down regulator capable of delivering
a lower voltage from an input supply voltage of 2.7V to
5.5V with high efficiency. Using a unique control architecture, the SC220 is capable of delivering a peak efficiency
of 90%, while maintaining efficiency over 80% during light
load condition. The converter operates at 20MHz switching frequency with Pulse Width Modulation (PWM) with
moderate to heavy output load current of up to 650mA,
which is referred as PWM mode. Under light-load condition, the converter operates in Power Save (PSAVE)
mode.
Control Scheme
The SC220 operates with a self-oscillating control method
based on the output voltage ripple. This control loop compares the output voltage to an internal 1V reference to
regulate the output voltage directly, adjusting the turn-on
and turn-off time of the power switches such that the
output voltage is held at a precise value. This architecture
gives a single-cycle response to transient events.
To maintain constant frequency, a phase locked loop (PLL)
is included to synchronize the switching with an internal
clock. This PLL adjusts the effective upper and lower
thresholds of the comparator, thus maintaining a constant
frequency. Under transient conditions the voltage control
loop determines the required switching pattern to best
maintain the output voltage. After a short transient, the
PLL will bring the switching frequency back to normal. At
extreme duty cycles, where the frequency control loop
may not be able to maintain frequency lock even under
steady-state conditions, frequency may fall, but the output
voltage regulation will be maintained by the main voltage
control loop. This unique architecture helps to achieve the
excellent line and load transient response.
Operating Modes
The SC220 operates in two modes over a wide range of
load currents. Under moderate to heavy load conditions,
it operates in PWM mode with the switching frequency
held constant. Under light-load condition, the converter
enters PSAVE mode automatically. With the typical 220nH
inductor, the transition between PWM and PSAVE mode
typically occurs in the range of 100-200mA, depending
on the input and output voltages. Under very light load
condition, the SC220 maintains high efficiency by shutting down all but the most essential circuit blocks,
maintaining a typical quiescent current of about 19μA. In
this mode, some circuitry used to control absolute DC
accuracy is turned off. In that case, there may be a small
DC shift (tens of millivolts) between normal operation
and this “no-load” state. However, in the case of a load
transient, the system will turn on the high-side FET within
nanoseconds as a discontinuous pulse is issued. The transition to PWM mode can occur within that nominal
on-time, giving superior no load to full load transient
response.
The transition from PWM mode to PSAVE mode is controlled by sensing the minimum value of the ripple
current. When it drops below a threshold level for 32
consecutive cycles, the transition to PSAVE mode is initiated. Once in PSAVE mode, the regulation is maintained
by modulating the time between fixed current pulses.
When a new pulse is required by the loop before the
existing pulse has terminated, the loop determines that
the load cannot be maintained in PSAVE mode. This
prompts an instantaneous switch from PSAVE mode back
to PWM mode.
Enable and Start-up
The SC220 is enabled by applying a voltage higher than
1.2V on the EN pin, and it is disabled when the applied
voltaga is pulled below the logic low threshold. The EN
pin can also be used to set the switching frequency: if a
digital clock is fed to EN, the SC220 will sense this as a
valid enable signal and the external clock will be used
rather than the internal 20MHz oscillator.
The SC220 has an internal soft start circuit that limits the
inrush current during start-up with a stepped current
limit. Over the course of about 40μs, the SC220 is stepped
in increments of one quarter of the nominal current limit
to full current limit, thereby reducing the worst-case
surge current that might otherwise be reflected to the
input current.
Current Limit
The SC220 integrates a current limit feature to protect
itself and the external components under overload con9
SC220
Applications Information (Cont.)
dition. When the current flowing through the high-side
PMOS switch exceeds the current limit, the PMOS switch
is turned off. The high-side switch is then held off for a
period sufficient to allow inductor current to decay. When
the output voltage is close to the nominal regulation
point, this will look similar to constant current limiting. As
the output voltage falls, the imposed off-time is such that
the frequency will drop, thus the inductor will have appropriate time to reset. This may cause the average current to
reduce, giving a mild ‘fold-back’ characteristic to the
current limit, where the average load current drops as the
output voltage collapses (although the peak current
maintains its nominal value). In a short-circuit condition,
the system runs continuously at this reduced frequency.
energy of the inductors in series. This approach uses multiple air core inductors implemented using printed circuit
traces. Because these traces may be located on internal
layers of the PCB, inductors can be designed with almost
no impact on the available PCB area for components on
the surface of the board. (See the efficiency curves using
X-EMI™ inductor technology on page 6).
Load Transient Response
The SC220 features excellent regulation during line and
load transients. This is due to the nature of the proprietary
control method and the high di/dt allowed by the use of a
small inductor. This allows for best performance while
providing the benefit of using a small low cost output
capacitor. VOUT shows only tens of millivolts of ripple
voltage during a load current step change from less than
1mA to 650mA within hundreds of nanoseconds, using
typical a 1μF output capacitor. (See the typical performance curves on page 7).
X-EMI™ Inductor Technology
The SC220 is the industry’s first buck regulator that enables
designers to draw their own inductors directly on the PC
board. This patented technology is called X-EMI™ inductor
technology and is different from conventional PCB trace
inductors. Conventional PCB trace inductors can be used
with high-frequency switchers, but they exhibit significant
EMI issues. X-EMI™ inductor technology solves these EMI
problems and can meet or exceed the EMI performance of
conventional chip inductors.
Figure 1. Top view of an evaluation board with X-EMI inductor
External Components
The input and output capacitors used for the operation of
the SC220 should be multilayer ceramic capacitors, preferably with X7R or X5R dielectric. The SC220 is optimized to
operate with typical 1μF input and output capacitance. In
practice, the self-resonant frequency of surface mount
capacitors of this type is well below the 20MHz ripple frequency, so efforts to minimize output ripple may best be
focused on minimizing the inductance of the output
capacitor and the length of the circuit path to ground
rather than on increasing the capacitance value of the
output capacitor.
The inductor should be a high current inductor rated for
currents at least up to 1A. Typical power inductors may be
too lossy at 20MHz unless specifically designed for high
frequency operation. For inductor value of 220nH, it may
be preferred to use wire-wound RF chokes, many of which
are rated for appropriate currents.
Some Recommended External Components
TM
X-EMI technology works by placing two small air-core
inductors adjacent to each other in anti-phase position,
where the magnetic fields of each air-core inductor partially cancel one another to reduce EMI. The net flux from
the two inductors, partially cancels the wide leakage paths
caused by the wide geometry, but is still able to store the
Value
Manufacturer
Part Number
Package
0.22μH
Coilcraft
XFL2005-221ME
2x2mm
L
0.24μH
Coilcraft
0603LS-241XJL
0603
CIN
1μF
Murata
GRM155R61C105KA12
0402
COUT
1μF
Murata
GRM155R61C105KA12
0402
10
SC220
Applications Information (Cont.)
PCB Layout Considerations
PCB Layout is important in designing a switching regulator. A few fundamental layout considerations will help to
achieve the specified performance. Poor layout can
degrade the performance of the switching regulator and
may contribute to EMI problems, ground bounce, and
possibly poor regulation and instability.
The following guidelines are recommended when developing a PCB layout:
1. The input capacitor, CIN should be placed as close to
the PVIN and PGND pins as possible. This capacitor
provides a low impedance loop for the pulsed
currents present at the buck converter’s input. Use
short wide traces to connect this capacitor as close
to the IC as possible. This will minimize EMI and input
voltage ripple by localizing the high frequency current
pulses.
2. Keep the SW pin traces as short as possible to minimize
the pickup of high frequency switching edges to
other parts of the circuit. The output capacitor, COUT
and the inductor should be put as close as possible to
the related pins of the IC, and connected as close as
possible between the SW and ground pins.
3. Route the output voltage feedback/sense path
from the output capacitor path, and away from the
inductor and SW node to minimize the possible noise
and magnetic interference to the output feedback/
sense path.
4. Use a ground plane referenced to the PGND pin,
and the ground connection of the input and output
capacitors should be put on this plane and close to
each other if possible, and as close to the PGND pin as
possible. Use several vias to connect to the component
side ground to further reduce noise and interference
on sensitive circuit nodes.
5. If possible, minimize the resistance from the VOUT
and AGND pins to the load. This will reduce the
voltage drop on the ground plane and improve the
load regulation. And it will also improve the overall
efficiency by reducing the copper losses on the output
and ground planes.
11
SC220
Outline Drawing — SOIC 8 Lead
A
D
e
N
D IM E N S IO N S
IN C H E S
M IL LIM E T E R S
D IM
M IN N O M M A X M IN N O M M A X
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(.041)
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0.25
0 .50
0.40 0.72 1.04
(1 .04)
8
0°
8°
0.10
0.25
0.20
1.35
0.10
1.25
0 .31
0.17
4.80
3.80
h
H
C A -B D
c
GAGE
P LA N E
0.25
S E E D E T A IL
A
S ID E V IE W
L
(L 1)
D E T A IL
01
A
NOTES:
1.
C O N T R O L L IN G D IM E N S IO N S A R E IN M ILLIM E T E R S (A N G LE S IN D E G R E E S ).
2.
D A T U M S -A - A N D
3.
D IM E N S IO N S "E 1" A N D "D " D O N O T IN C L U D E M O LD F LA S H , P R O T R U S IO N S
OR GATE BURRS.
4.
R E F E R E N C E JE D E C S T D M S -012, V A R IA T IO N A A .
-B - T O B E D E T E R M IN E D A T D A T U M P LA N E -H -
12
SC220
Land Pattern —SOIC 8 Lead
X
D IM
(C )
G
Z
Y
D IM E N S IO N S
IN C H E S
M IL LIM E T E R S
C
G
P
X
Y
Z
(.2 0 5 )
.118
.050
.024
.087
.291
(5.2 0 )
3.00
1.27
0.60
2.20
7.40
P
NOTES:
1.
T H IS LA N D P A T T E R N IS F O R R E F E R E N C E P U R P O S E S O N L Y .
C O N S U LT Y O U R M A N U F A C T U R IN G G R O U P T O E N S U R E Y O U R
C O M P A N Y 'S M A N U F A C T U R IN G G U ID E L IN E S A R E M E T .
2.
R E F E R E N C E IP C -S M -7 8 2 A , R L P N O . 3 0 0 A .
13
SC220
© Semtech 2012
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operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation
outside the specified range.
SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFESUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS
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Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111 Fax: (805) 498-3804
www.semtech.com
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