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What is STL6121?

This electronic component, produced by the manufacturer "Semtron", performs the same function as "300mA Linear Regulator With Fast Enable and Solf Start".


STL6121 Datasheet PDF - Semtron

Part Number STL6121
Description 300mA Linear Regulator With Fast Enable and Solf Start
Manufacturers Semtron 
Logo Semtron Logo 


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STL6121
DESCRIPTION
300mA Linear Regulator With Fast Enable and Solf Start
FEATURE
The STL6121 series is a low-dropout linear
regulator with ON/OFF control that operates in the
input voltage range from +2.4V to +9.0V and delivers
300mA output current.
The STL6121 is available fixed output voltage
type is preset at an internally trimmed voltage 1.8V,
2.5V, or 3.3V. Other options 1.0V, 1.2V,1.5V, 2.85V,
3.0V and 3.6V are available by special order only.
‹ Low Current Consumption: 60μA
‹ Short Circuit Protection: 150mA
‹ Typical Dropout Voltage: 300mV@300mA
‹ Fast Response in Power-on Transient
‹ Output Current Limit Protection: 600mA
‹ Thermal Overload Shutdown Protection
‹ Control Output ON/OFF Function
‹ High Ripple Rejection: 65dB (Typ.)
The STL6121 series consists of a 0.95V
bandgap reference, an error amplifier, and a P-
channel pass transistor. Other features include soft
start function, short-circuit protection and thermal
shutdown protection. The STL6121 series devices
are available in SOT-25 packages.
APPLICATIONS
‹ Battery Powered Equipment.
‹ PC Peripherals
‹ Portable Electronics
‹ Wireless Devices
‹ Mobile Phone, Coreless Phone
PIN CONFIGURATION
VIN
GND
EN
VOUT
SS
TOP VIEW
SOT-23-5
PART MARKING INFORMATIO
STL6121-XX XX-XX X
Lead Plating Code
Handling Code
Package Code
Lead Plating Code
Voltage Code
G : Lead-free product.
This product is RoHS compliant
Handling Code
TR : Tape&Reel TB : Tape&Box
Package Code
S5 : SOT-25
Voltage Code
XX : 15 / 18 / 25 / 285 / 30 / 33
Marking:
4VAXX
SOT-25
4 : STL6121
V : Voltage code
8:1.5V, A:1.8V
G:2.5V, L:2.85
M:3.0V, Q:3.3V
A : Enable Function
XX: Date code
STL6121 Rev.1.0
Copyright © Semtron Microtech Corp.
1
www.semtron-micro.com

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STL6121 equivalent
APPLICATION INFORMATION
Detail Description
The STL6121 is a low-dropout linear regulator.
The device provides preset 1.8V, 2.5V and 3.3V
output voltages for output current up to 300mA.
Other mask options for special output voltages are
also available. As illustrated in function block
diagram, it consists of a 0.95V bandgap reference,
an error amplifier, a P-channel pass transistor and
an internal feedback voltage divider.
The 0.95V bandgap reference 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 feedback through an
internal resistive divider connected to OUT pin.
Additional blocks include an output current limiter,
thermal sensor, and shutdown logic.
Output Voltage Selection
For fixed voltage type of STL6121, 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 STL6121-33 has a preset 3.3V output
voltage.
Dropout Voltage
A regulator’s minimum input-output voltage
differential, or dropout voltage, determines the
lowest usable supply voltage. In battery-powered
systems, this will determine the useful end-of-life
battery voltage. The STL6121 use a P-channel
MOSFET pass transistor, its dropout voltage is a
function of drain-to-source on-resistance RDS(ON)
multiplied by the load current.
VDROPOUT= VIN - VOUT= RDS(ON) x IOUT
Current Limit
The STL6121 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 600mA
(Typ.)
Internal P-channel Pass Transistor
The STL6121 features a P-channel MOSFET
pass transistor. Unlike similar designs using PNP
pass transistors, P-channel MOSFETs require no
STL6121
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 STL6121 does not suffer from these problems
and consumes only 60μA (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.
Soft Start Function
The capacitor can be connected between the SS
pin and GND. This capacitor can be a low cost
Polyester Film variety. A larger capacitor improves
the AC ripple rejection, but also makes the output
come up slowly. This "Soft" turn-on is desirable in
some applications to limit turn-on surges.
Fast Discharge Function
The STL6121 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.
Thermal Overload Protection
Thermal overload protection limits total power
dissipation in the STL6121. When the junction
temperature exceeds TJ = +165°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 STL6121 in the event of fault conditions.
For continuous operation, the absolute maximum
operating junction temperature rating of TJ =
+125°C should not be exceeded.
Operating Region and Power Dissipation
Maximum power dissipation of the STL6121
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
STL6121 Rev.1.0
Copyright © Semtron Microtech Corp.
5
www.semtron-micro.com


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for STL6121 electronic component.


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