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PDF STL6119 Data sheet ( Hoja de datos )
| Número de pieza | STL6119 | |
| Descripción | Fast Transient Response LDO | |
| Fabricantes | Semtron | |
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STL6119
500mA Low noise, High PSRR, Fast Transient Response LDO
■DESCRIPTION
■FEATURE
The STL6119 is a 500mA low noise and fast
transient response liner regulator with adjustable
output voltage and ultra-low dropout voltage. Its
output voltage is programmed by a resistor divider,
and can be as low as 0.8V, which satisfies the most
advanced ICs which may require supply voltage to
be 0.9V –1.2V.
SMC6118 is consists of a precise voltage reference,
an error amplifier, a compensation network and
alow ON-resistance power P-MOSFET. It also
integrates many protection circuitry, like current limit
and over-temperature protection module.
STL6119 ROHS Compliant This is Halogen Free
Low Consumption Current: 40μA
Shutdown Current <1uA
Ultra Low Dropout Voltage: 370mV@500mA
Thermal Overload Shutdown Protection
Short-circuit Protection.
High Ripple Rejestion: 65dB
Low ESR Capacitor Compatible
■FEATURE
Battery Powered Equipment.
Portable Information Application
PCMCIA & New Card
Mini PCI & PCI-Express Cards
Graphic Card
Laptop, Palmtops, Notebook Computers
■PIN CONFIGURATION
Vout
NC/ADJ
Vin GND EN
SOT-23 -5L
Top View
■PART NUMBER INFORMATION
STL 6119 XX S5 – TR G
a b cd ef
a : Company name,Product Serial number.
b : Product Number
c: Output Voltage Code.
d: Package code.
e : Handling code.
f : Green produce code.
STL6119 Rev.2.0
Copyright © Semtron Microtech Corp.
micro.com
1
www.semtron-
1 page  
STL6119
■APPLICATION INFORMATION
◆Detail Description
The STL6119 is a low-dropout linear regulator.
The device provides preset 1.2V, 1.8V, 2.8V,3.0V
and 3.3V output voltages for output current up to
500mA. Adjustable output voltage and other mask
options for special output voltages are also available,
it consists of an error amplifier, a P-channel pass
transistor and an internal feedback voltage divider.
The bandgap reference for fixed voltage types is
connected to the error amplifier, which compares
this reference with the feedback voltage and
amplifies the voltage difference. If the feedback
voltage is lower than the reference voltage, the
pass-transistor gate is pulled lower, which allows
more current to pass to the output pin and increases
the output voltage. If the feedback voltage is too
high, the pass transistor gate is pulled up to
decrease the output voltage.
The output voltage is feed back through an
internal resistive divider (or external resistive divider
for adjustable output voltage type) connected to
OUT pin. Additional blocks include an output current
limiter, thermal sensor, and shutdown logic.
◆Internal P-channel Pass Transistor
The STL6119 features a P-channel MOSFET
pass transistor. Unlike similar designs using PNP
pass transistors, P-channel MOSFETs require no
base drive, which reduces quiescent current. PNP-
based regulators also waste considerable current in
dropout when the pass transistor saturates, and use
high base-drive currents under large loads. The
STL6119 does not suffer from these problems and
consumes only 40μA (Typ.) of current consumption
under heavy loads as well as in dropout conditions.
◆Enable Function
EN pin starts and stops the regulator. When the
EN pin is switched to the power off level, the
operation of all internal circuit stops, the build-in P-
channel MOSFET output transistor between pins VIN
and VOUT is switched off, allowing current
consumption to be drastically reduced. The VOUT pin
enters the GND level through the internal discharge
path between VOUT and GND pins.
◆Fast Discharge Function
The STL6119 fixed type has fast discharge
Function on EN pin disable. When user turns off the
device, its internal pull-low resistor will discharge
output capacitor charge. It’ll avoid other device to
arise wrong motions.
◆Output Voltage Selection
For fixed voltage type of STL6119, the output
voltage is preset at an internally trimmed voltage.
The first two digits of part number suffix identify the
output voltage (see Ordering Information). For
example, the STL6119-33 has a preset 3.3V output
voltage. For adjustable voltage type of STL6119, the
output voltage is set by comparing the feedback
voltage at adjust terminal to the internal bandgap
reference voltage. The reference voltage VREF is
1.175V. The output voltage is given by the equation:
VOUT=VREF x (1+R1/R2)
(See Typical Application Schematic.)
◆Current Limit
The STL6119 also includes a fold back current
limiter. It monitors and controls the pass transistor’s
gate voltage, estimates the output current, and limits
the output current within 1.0A.
◆Thermal Overload Protection
Thermal overload protection limits total power
dissipation in the STL6119. When the junction
temperature exceeds TJ = +150°C, a thermal sensor
turns off the pass transistor, allowing the IC to cool
down. The thermal sensor turns the pass transistor
on again after the junction temperature cools down
by 20°C, resulting in a pulsed output during
continuous thermal overload conditions.
Thermal overload protection is designed to protect
the STL6119 in the event of fault conditions. For
continuous operation, the absolute maximum
operating junction temperature rating of TJ = +125°C
hould not be exceeded.
◆Operating Region and Power Dissipation
Maximum power dissipation of the STL6119
depends on the thermal resistance of the case and
circuit board, the temperature difference between
the die junction and ambient air, and the rate of
airflow. The power dissipation across the devices is
P = IOUT x (VIN-VOUT). The resulting maximum power
dissipation is:
STL6119 Rev.2.0
Copyright © Semtron Microtech Corp.
5
www.semtron-micro.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet STL6119.PDF ] | |
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