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SC221 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 SC221
기능 Synchronous Step-Down Regulator
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SC221 데이터시트, 핀배열, 회로
SC221 x
POWER MANAGEMENT
20MHz, 650mA, X-EMI-Enabled
Synchronous Step-Down Regulator
Features
Description
„„ Patented X-EMITM Inductor Technology
„„ Enables Trace Inductors in PC Board Material
„„ Excellent EMI Performance
„„ Efficiency up to 90%
„„ 17.5µA Quiescent Current under Very Light Loads
„„ 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 MLPD-UT 8 Lead Packages
„„ Lead-free, Halogen-free, and RoHS/WEEE Compliant
Applications
„„ HDTV, Set Top Boxes, Gaming Consoles
„„ POL Applications
„„ White Goods
The SC221 is a 20MHz X-EMI™(1)-enabled step-down regu-
lator optimized for power 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 tech-
nology meets or exceeds the EMI performance of chip
inductors and eliminates the need for discrete inductors.
The SC221 uses a unique constant frequency, self-oscil-
lating control loop architecture to provide excellent
transient performance. Under light loads, the device
operates in Power Save mode(PSAVE) maintaining a
typical quiescent current of 17.5µA. At moderate to heavy
loads, this part operates in PWM mode with a constant
switching frequency of 20MHz. This high switching fre-
quency 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 SC221 is available in MLPD-UT 8 Lead package.
Note 1: Purchase of SC221 includes royalty-free right to use X-EMITM inductor technology with no addi-
tional cost.
Typical Application Circuit
VIN
2.7~5.5V
CIN
1 µF
PVIN
SW
AVIN
VOUT
SC221
L, 220nH
VOUT=1.8V
up to 650mA
R1
COUT
1 µF
Enable
EN
PGND
AGND
FB
R2
Revision 2.0
© 2016 Semtech Corporation
1




SC221 pdf, 반도체, 판매, 대치품
SC221 x
Electrical Characteristics (continued)
Unless otherwise specified: AVIN=PVIN = 3.6V, EN = AVIN = PVIN, 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
Feedback Leakage Current
ENABLE
IFB
EN Input High Voltage Threshold
EN Input “Low”Voltage Threshold
EN Input High Current
EN Input Low Current
Minimum Synchronization Frequency
PROTECTION
VENH
VENL
IENH
IENL
fSYN_MIN
Over Temp Thermal Shutdown(1)
Thermal Shutdown Hysteresis(1)
Notes
(1) Guaranteed by design. Not tested in production.
TOT
THYST
Condition
VEN= VIN
VEN= AGND
Square wave applied at EN pin
Min
1.2
-1.0
-1.0
Typ
150
15
Max
1
Units
µA
V
0.4 V
1.0 µA
1.0 µA
3 MHz
°C
°C
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SC221 전자부품, 판매, 대치품
Typical Characteristics (Continuous)
Load Transient Response
VIN = 3.6V, VOUT = 1.8V, IOUT = 0mA - 500mA
VOUT
(ac coupled)
100mV/div
SC221 x
Load Transient Response
VIN = 3.6V, VOUT = 1.8V, IOUT = 80mA - 500mA
VOUT
(ac coupled)
50mV/div
200mA/div
200us/div
Steady State Operation
VIN = 3.6V, VOUT = 1.8V, IOUT = 50mA
IOUT
50mA/div
IL
500mA/div
VSW
2V/div
500ns/div
Output Hard Short
VIN = 5V, VOUT = 1.8V, IOUT = 650mA
VOUT
1V/div
IL
500mA/div
500ns/div
200mA/div
200us/div
Steady State operation
VIN = 3.6V, VOUT = 1.8V, IOUT = 300mA
IOUT
200mA/div
IL
200mA/div
VSW
2V/div
50ns/div
Input Quiescent Current vs. Temperature
18 VIN= 3.6V, EN = High, FB = High
17.5
17
16.5
16
-40
0 40 80
Temperature (°C)
120
160
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