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PDF STL6342 Data sheet ( Hoja de datos )
| Número de pieza | STL6342 | |
| Descripción | 250mA Low Quiescent Current Linear Regulator | |
| Fabricantes | Semtron | |
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STL6342
250mA Low Quiescent Current Linear Regulator
■DESCRIPTION
■FEATURE
The STL6342 series is a positive voltage
regulator with high accuracy output voltage and
ultra-low quiescent current which is typically 2.0μA.
The device is ideal for handheld communication
equipments and battery powered applications which
require low quiescent current.
The STL6342 consists of a bandgap reference
voltage source, an error amplifier, a P-channel pass
transistor, a resistor-divider for setting output
voltage, a current limiter, and temperature limit
protection circuit. The high-accuracy output voltage
is preset at an internally trimmed voltage 1.8V, 2.5V
or 3.3V. Other output voltages can be
maskoptioned from 1.2V to 5.0V with 100mV
increment. (but only 1.28V in stead of 1.3V)
Low Current Consumption: 2μA
Short Circuit Protection: 200mA
Low Dropout: 150mV@100mA (VOUT≧2.0V)
Operating Voltages Range: 1.8V to 6.0V
Output Range: 1.2V to 5.0V with 100mV
Increment
Output Current Limit Protection: 350mA
Thermal Overload Shutdown Protection
High Ripple Rejestion: 60dB
Low ESR Capacitor Compatible
■APPLICATIONS
Battery Powered Equipment.
Portable Information Application
PDA
MP3
Digital Video Recorder
■PIN CONFIGURATION
VOUT
VIN
TOP VIEW
SOT-89
GND
■PART MARKING INFORMATION
STL6342-XX XX-XX X
Lead Plating Code
Handling Code
Package Code
Voltage Code
Lead Plating Code
G : Lead-free & Halogen-free product
Handling Code
TR : Tape&Reel
Package Code
K : SOT-89 S : SOT-23
Voltage Code
XX : 12 / 15 / 18 / 25 / 28 / 30 / 33
GND
VOUT
VIN
TOP VIEW
SOT-23
Marking:
09VXX
09 : STL6342
V : Voltage code
5:1.2V, 8:1.5V
A:1.8V, G:2.5V
K:2.8V, M:3.0V
Q:3.3V
XX : Date code
STL6342 Rev.1.0
Copyright © Semtron Microtech Corp.
1
www.semtron-micro.com
1 page  
■APPLICATION INFORMATION
◆Detail Description
The STL6342 is a low quiescent current LDO
linear regulator. The device provides preset 1.8V,
2.5V and 3.3V output voltages for output current up
to 350mA. Other mask options for special output
voltages from 1.2V to 5.0V with 100mV increment
are also available (but only 1.28V in stead of 1.3V).
As illustrated in function block diagram, it consists of
a 1.23V reference, error amplifier, a P-channel pass
transistor, an ON/OFF control logic, and an internal
feedback voltage divider.
The 1.23V 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 VOUT pin. Additional
blocks include with output current limiter and
shutdown logic.
◆Internal P-channel Pass Transistor
The STL6342 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 conditions when the pass transistor
saturates, and use high base-drive currents under
large loads. The STL6342 does not suffer from
these problems and consumes only 2.0μA (Typical)
of current consumption under light loads.
◆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 due to the several MΩ
resistance of the feedback voltage divider between
VOUT and GND pins.
◆Output Voltage Selection
The STL6342 output voltage is preset at an
internally trimmed voltage 1.8V, 2.5V or 3.3V. The
output voltage also can be mask-optioned from 1.2V
to 5.0V with 100mV increment by special order (but
STL6342
only 1.28V in stead of 1.3V). The first two digits of
part number suffix identify the output voltage (see
Ordering Information). For example, STL6342-33
has a preset 3.3V output voltage.
◆Current Limit
The STL6342 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 350mA.
◆Thermal Overload Protection
Thermal overload protection limits total power
dissipation in the STL6342. When the junction
temperature exceeds TJ = +155°C, a thermal sensor
turns off the pass transistor, allowing the IC to cool
down. The thermal sensor turns the pass transistor
active again after the junction temperature cools
down by 10°C, resulting in a pulsed output during
continuous thermal overload conditions.
Thermal overload protection is designed to protect
the STL6342 in the event of fault conditions. For
continuous operation, the maximum operating
junction temperature rating of TJ=+125°C should not
be exceeded.
◆Dropout Voltage
A regulator’s minimum input-output voltage
differential, or dropout voltage, determines the
lowest us- able supply voltage. In battery-powered
systems, this will determine the useful end-of-life
battery voltage. The STL6342 uses 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
STL6342 Rev.1.0
Copyright © Semtron Microtech Corp.
5
www.semtron-micro.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet STL6342.PDF ] | |
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