Document
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 regulator 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 safeguard the device under stressed conditions. These include short circuit protection, over-temperature protection, 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
Pin Configuration
CTL3
CTL2 CTL1 CTL0
8 17
TOP VIEW
26
3 4
5
IN LX GND
Ordering Information
Device
Package
SC195FULTRT(1)(2)
MLPQ-UT8 1.5 x 1.5
SC195FEVB
Evaluation Board
Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Lead-free packaging only. Device is WEEE and RoHS compliant
and halogen-free.
OUT MLPQ-UT8; 1.5 x 1.5, 8 LEAD
θJA = 116°C/W
Marking Information
5F=SC195F yw=Date Code
Table 1 – Output Voltage Settings
CTL3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
CTL2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
CTL1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
CTL0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Vout Off 0.80 1.00 1.20 1.40 1.50 1.60 1.80 2.30 2.35 2.00 2.40 2.45 2.80 3.00 3.30
2
SC195F
Absolute Maximum Ratings
IN (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 LX Voltage (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.0 to VIN +0.5 Other Pins (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN + 0.3 Output Short Circuit to GND. . . . . . . . . . . . . . . . . Continuous ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5
Recommended Operating Conditions
Input Voltage Range (V). . . . . . . . . . . . . . . . . . . . . +2.9 to +5.5
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W). . . . . 116 Junction Temperature Range (°C). . . . . . . . . . . . -40 to +150 Storage Temperature Range (°C). . . . . . . . . . . . . -65 to +150
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) Tested according to JEDEC standard JESD22-A114. (2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB per JESD51 standards.
Electrical Characteristics
Unless otherwise specified: VIN= 3.6V, CIN= 4.7µF, COUT=10µF, LX=1µH, VOUT=2.0V, TJ(MAX)=125°C, TA= -40 to +85 °C. Typical values are TA=+25 °C
Parameter
Symbol
Condition
Min Typ Max Units
Output Voltage Range Output Voltage Tolerance Line Regulation Load Regulation Output Current Capability Current Limit Threshold Foldback Current Limit
Under-Voltage Lockout
VOUT VOUT_TOL ΔVLINEREG ΔVLOADREG
IOUT ILIMIT IFB_LIM
VUVLO
IOUT = 200mA 2.9 ≤ VIN ≤ 5.5V, IOUT = 200mA
200mA ≤ IOUT ≤ 500mA
ILOAD > ILIMIT Rising VIN Hysteresis
0.8 -2.0
500 800
3.3 (1)
V
2.0 %
0.3 %/V
-1 %/A
mA
1300
mA
150 mA
2.9 V
200 mV
Quiescent Current Shutdown Current LX Leakage Current High Side Switch Resistance(2) Low Side Switch Resistance(3) Switching Frequency
IQ ISD ILX RDSON_P RDSON_N fSW
IOUT = 0mA VCTL 0-3= 0V Into LX pin IOUT= 100mA IOUT= 100mA
4.8 mA
0.1.