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SC195F 데이터시트 PDF




Semtech에서 제조한 전자 부품 SC195F은 전자 산업 및 응용 분야에서
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부품번호 SC195F 기능
기능 500mA Synchronous Step Down DC-DC Regulator
제조업체 Semtech
로고 Semtech 로고


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SC195F 데이터시트, 핀배열, 회로
POWER MANAGEMENT
Features
„„ Input Voltage — 2.9V to 5.5V
„„ Output Voltage — 0.8V to 3.3V
„„ Output current capability — 500mA
„„ Efficiency up to 94%
„„ 15 Programmable output voltages
„„ Fast transient response
„„ Oscillator frequency — 3.5MHz
„„ 100% duty cycle capability
„„ Quiescent current — 4.8 mA typ
„„ Shutdown Current — 0.1µA typ
„„ Internal soft-start
„„ Over-voltage protection
„„ Current limit and short circuit protection
„„ Over-temperature protection
„„ Input under-voltage lockout
„„ Floating control pin protection
„„ MLPQ-UT8 1.5 x 1.5 x 0.6 (mm) package
„„ Pb free, halogen free, and RoHS/WEEE compliant
Applications
„„ Smart phones and cellular phones
„„ MP3/Personal media players
„„ Personal navigation devices
„„ Digital cameras
„„ Single Li-ion cell or 3 NiMH/NiCd cell devices
„„ Devices with 3.3V or 5V internal power rails
SC195F
3.5MHz, 500mA Synchronous
Step Down DC-DC Regulator
Description
The SC195F is a high efficiency, 500mA step down regula-
tor designed to operate with an input voltage range of
2.9V to 5.5 V. The input voltage range makes it ideal for
battery operated applications with space limitations. The
SC195F operates at a fixed 3.5MHz switching frequency in
normal PWM (Pulse-Width Modulation) mode. The
SC195F also includes fifteen programmable output
voltage settings that can be selected using the four
control pins, eliminating the need for external feedback
resistors. The output voltage can be fixed to a single
setting or dynamically switched between different levels.
Pulling all four control pins low disables the output.
The SC195F provides several protection features to safe-
guard the device under stressed conditions. These
include short circuit protection, over-temperature protec-
tion, input under-voltage lockout, and soft-start to control
in-rush current. These features, coupled with the small
1.5 x 1.5 x 0.6 (mm) package make the SC195F a versatile
device ideal for step-down regulation in products needing
high efficiency and a small PCB footprint.
Typical Application Circuit
VIN
2.9V to 5.5V
CIN
4.7µF
SC195F
IN
LX
OUT
LX
1.0µH
Control Logic
Lines
Rev 2.0
CTL3
CTL2
CTL1
CTL0
GND
© 2016 Semtech Corporation
VOUT
0.8V to 3.3V
COUT
10µF
1




SC195F pdf, 반도체, 판매, 대치품
SC195F
Electrical Characteristics (continued)
Parameter
Symbol
Condition
Soft-Start
tSS
Thermal Shutdown
TOT
Thermal Shutdown Hysteresis
THYST
Logic Inputs - CTL0, CTL1, CTL2, and CTL3
VOUT = 90% of final value (4)
Rising temperature
Input High Voltage
VIH
Input Low Voltage
VIL
Input High Current
IIH VCTL 0-3= VIN
Input Low Current
IIL VCTL 0-3= GND
Notes
(1) Maximum output voltage is limited to VIN if the input is less than 3.3V.
(2) Measured from IN to LX.
(3) Measured from LX to GND.
(4) Soft start time depends on the load and output capacitance, see Soft Start section.
Min Typ Max Units
350 500
µs
160 °C
20 °C
1.6 V
0.4 V
-2.0 5.0 µA
-2.0 2.0 µA
4

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SC195F 전자부품, 판매, 대치품
SC195F
Typical Characteristics (continued)
Heavy Load Switching — VOUT = 1.0V
VOUT (50mV/div)
Heavy Load Switching — VOUT = 1.8V
VOUT (50mV/div)
VLX (2.0V/div)
VLX (2V/div)
ILX (200mA/div)
ILX (200mA/div)
Time (200ns/div)
Load Transient Response — 200 to 500mA
VOUT (100mV/div)
Time (200ns/div)
VID Transient Response — PWM
1.2V to 1.8V transition
VOUT (500mV/div)
ILX (500mA/div)
ILOAD (500mA/div)
Time (20μs/div)
Line Transient Response — PWM
3.5V to 4.0V transition on VIN
VOUT (100mV/div)
ILX (200mA/div)
ILX (200mA/div)
VCTL2 (2.0V/div)
Time (20μs/div)
Shutdown Transient Response
VOUT (2V/div)
ILX (200mA/div)
VIN 500mV/div)
Time (20μs/div)
VCTL3-0 (2V/div)
Time (20μs/div)
7

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