SULR1190 Datasheet, PDF (12/19 Pages) Sangdest Microelectronic (Nanjing) Co., Ltd – Ultra LDO 1A Linear Regulator With

Technical Data
Data Sheet N1577, Rev. -
SULR1190
Ultra LDO 1A Linear Regulator With
Application Information
The SULR1190 is a high performance linear regulator that provides low-dropout voltage and low quiescent-
current. The device is available in an adjustable version and fixed output voltages ranging from 1.2V to 3.8V,
and the device can supply loads up to 1A.
SHUTDOWN __
By connecting EN(EN) pin to VIN(ground), the SULR1190 can be shut down to reduce the supply current to
0.1μA(typ.). At this operation mode, the output voltage of SULR1190 is equal to 0V.
CURRENT LIMIT
The SULR1190 includes a current limiter, which monitors and controls the maximum output current. If the
output is overloaded or shorted to ground, this can protect the device from being damaged.
THERMAL PROTECTION
The SULR1190 includes a thermal-limiting circuit, which is designed to protect the device against overload
condition. When the junction temperature exceeds TJ=150ºC, the thermal-limiting circuit turns off the pass
transistor and allows the IC to cool. For continuous load condition, maximum rating of junction temperature
must not be exceeded.
INPUT-OUTPUT CAPACITORS
Linear regulators require input and output capacitors to maintain stability. Input capacitor at 2.2μF with a 2.2μF
ceramic output capacitor is recommended. When choosing the input and output ceramic capacitors, X5R and
X7R types are recommended because they retain their capacitance over wider ranges of voltage and
temperature than other types.
NOISE BYPASS CAPACITOR
A 22nF bypass capacitor at BP pin can reduce output voltage noise. The bypass pin can be floating if it’s
unnecessary.
OUTPUT VOLTAGE PROGRAMMING
The output voltage of SULR1190 linear regulator can be set by its internal feedback resistors when the ADJ
pin is grounded. In addition, the output voltage of SULR1190 linear regulator can be set by the external
feedback resistors when connecting a resistive divider R1 and R2. While connecting a resistive divider, VOUT
can be calculated as:
R₁
V_OUT = 0.8×{1+
}
R₂
The resistive divider should sit as close to ADJ pin as possible.
POWER DISSIPATION
The maximum power dissipation of SULR1190 depends on the thermal resistance of its case and circuit
board, the temperature difference between the die junction and ambient air, and the rate of airflow. The rate
of temperature rise is greatly affected by the mounting pad configuration on the PCB, the board material, and
the ambient temperature. When the IC mounting with good thermal conductivity is used, the junction
temperature will be low even when large power dissipation applies.
The power dissipation across the device is P = I (V -V ).
OUT IN OUT
• China - Germany - Korea - Singapore - United States •
• http://www.smc-diodes.com - sales@ smc-diodes.com •