Sharp LC-22LE240K Service Manual ▷ View online
45
LC-22LE240
12.5. Pinning
13. MP2012 (U176)
13.1. General Description
The MP2012 is a fully integrated, internally compensated 1.2MHz fixed frequency PWM
step-down converter. It is ideal for powering portable equipment that runs from a single
cell Lithium-Ion (Li+) Battery, with an input range from 2.7V to 6V. The MP2012 can
provide up to 1.5A of load current with output voltage as low as 0.8V. It can also operate
at 100% duty cycle for low dropout applications. With peak current mode control and
internal compensation, the MP2012 is stable with ceramic capacitors and small inductors.
Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown.
13.2. Features
2.7-6V Input Operation Range
Output Adjustable from 0.8V to VIN
1μA Max Shutdown Current.
Up to 95% Efficiency
100% Duty Cycle for Low Dropout
Applications
1.2MHz Fixed Switching Frequency
Stable with Low ESR Output Ceramic
Capacitors
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Short Circuit Protection
Available in 6-pin 3x3mm QFN
13.3. Pinning
Pin
#
Name
Description
1
FB
Feedback input. An external resistor divider from
the output to GND, tapped to the FB pin sets the
output voltage.
2
GND,
Exposed
Pad
Ground pin. Connect exposed pad to ground
plane for proper thermal performance.
3
SW
Switch node to the inductor.
4
PVIN
Input supply pin for power FET.
5
VIN
Input Supply pin for controller. Put small
decoupling ceramic near this pin.
6
EN
Enable input, “High” enables MP2012. EN is
pulled to GND with 1Meg internal resistor.
14. RTA8283A (U23, U173)
14.1. General Description
The RT8283A is a high-efficiency, monolithic synchronous step-down DC/DC converter
that can deliver up to 3A output current from a 4.5V to 23V input supply. The RT8283A's
current mode architecture and external compensation allow the transient response to be
optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit
provides protection against shorted outputs and soft-start eliminates input current surge
during start-up. The RT8283A also provides output under voltage protection and thermal
shutdown protection. The low current (<3μA) shutdown mode provides output disconnect,
enabling easy power management in batterypowered systems. The RT8283A is available
in a SOP-8 package.
14.2. Features
±1.5% High Accuracy Feedback Voltage
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 340kHz
Output Adjustable from 0.8V to 20V
Up to 95% Efficiency
Thermal Shutdown Protection
14.3. Pinning
46
LC-22LE240
Pin
#
Name
Description
1
FB
Feedback input. An external resistor divider from
the output to GND, tapped to the FB pin sets the
output voltage.
2
GND,
Exposed
Pad
Ground pin. Connect exposed pad to ground
plane for proper thermal performance.
3
SW
Switch node to the inductor.
4
PVIN
Input supply pin for power FET.
5
VIN
Input Supply pin for controller. Put small
decoupling ceramic near this pin.
6
EN
Enable input, “High” enables MP2012. EN is
pulled to GND with 1Meg internal resistor.
14. RTA8283A (U23, U173)
14.1. General Description
The RT8283A is a high-efficiency, monolithic synchronous step-down DC/DC converter
that can deliver up to 3A output current from a 4.5V to 23V input supply. The RT8283A's
current mode architecture and external compensation allow the transient response to be
optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit
provides protection against shorted outputs and soft-start eliminates input current surge
during start-up. The RT8283A also provides output under voltage protection and thermal
shutdown protection. The low current (<3μA) shutdown mode provides output disconnect,
enabling easy power management in batterypowered systems. The RT8283A is available
in a SOP-8 package.
14.2. Features
±1.5% High Accuracy Feedback Voltage
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 340kHz
Output Adjustable from 0.8V to 20V
Up to 95% Efficiency
Thermal Shutdown Protection
14.3. Pinning
Pin No.
Pin
Name
Description
1
BOOT
Bootstrap for high-side gate driver. Connect a 0.1
μF or
greater ceramic capacitor from BOOT to SW pins.
2
VIN
Input Supply 4.5V to 23V. Must bypass with a suitably
large ceramic capacitor.
3
SW
Phase Node--Connect to external L-C filter..
4, 9 (Exposed
Pad)
GND
Ground.
5
FB
Feedback Input pin is connected to the converter output.
It is used to set the output of the converter to regulate to
the desired value via an internal res divider. For an
adjustable output, an external res divider is connected to
this pin.
6
COMP
Compensation Node. COMP is used to compensate the
regulation Control loop. Connect a series RC network
from COMP to GND. In some cases, an additional
capacitor from COMP to GND is required.
7
EN
Enable Input Pin. Logic high enables the converter; a
logic low forces the RT8253A into shutdown mode.
Attach this pin to VIN with a 100kΩ pull up resistor for
automatic startup.
8
SS
Soft-Start Control Input. SS controls the soft-start period.
Connect a capacitor from SS to GND to set the soft-start
period. A 0.1
period. A 0.1
μF capacitor sets the soft-start period to
13.5ms.
15. MP1583 (U174)
15.1. General Description
The MP1583 is a step-down regulator with a built-in internal Power MOSFET. It achieves
3A of continuous output current over a wide input supply range with excellent load and
line regulation. Current mode operation provides fast transient response and eases loop
stabilization. Fault condition protection includes cycle-by-cycle current limiting and thermal
shutdown. An adjustable soft-start reduces the stress on the input source at start-up. The
MP1583 requires a minimum number of external components, providing a compact
solution.
15.2. Features
3A Output Current
Programmable Soft-Start
100mΩ Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic Capacitors
Up to 95% Efficiency
20μA Shutdown Mode
Fixed 385KHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Pin
#
Name
Description
1
FB
Feedback input. An external resistor divider from
the output to GND, tapped to the FB pin sets the
output voltage.
2
GND,
Exposed
Pad
Ground pin. Connect exposed pad to ground
plane for proper thermal performance.
3
SW
Switch node to the inductor.
4
PVIN
Input supply pin for power FET.
5
VIN
Input Supply pin for controller. Put small
decoupling ceramic near this pin.
6
EN
Enable input, “High” enables MP2012. EN is
pulled to GND with 1Meg internal resistor.
14. RTA8283A (U23, U173)
14.1. General Description
The RT8283A is a high-efficiency, monolithic synchronous step-down DC/DC converter
that can deliver up to 3A output current from a 4.5V to 23V input supply. The RT8283A's
current mode architecture and external compensation allow the transient response to be
optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit
provides protection against shorted outputs and soft-start eliminates input current surge
during start-up. The RT8283A also provides output under voltage protection and thermal
shutdown protection. The low current (<3μA) shutdown mode provides output disconnect,
enabling easy power management in batterypowered systems. The RT8283A is available
in a SOP-8 package.
14.2. Features
±1.5% High Accuracy Feedback Voltage
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 340kHz
Output Adjustable from 0.8V to 20V
Up to 95% Efficiency
Thermal Shutdown Protection
14.3. Pinning
Pin
#
Name
Description
1
FB
Feedback input. An external resistor divider from
the output to GND, tapped to the FB pin sets the
output voltage.
2
GND,
Exposed
Pad
Ground pin. Connect exposed pad to ground
plane for proper thermal performance.
3
SW
Switch node to the inductor.
4
PVIN
Input supply pin for power FET.
5
VIN
Input Supply pin for controller. Put small
decoupling ceramic near this pin.
6
EN
Enable input, “High” enables MP2012. EN is
pulled to GND with 1Meg internal resistor.
14. RTA8283A (U23, U173)
14.1. General Description
The RT8283A is a high-efficiency, monolithic synchronous step-down DC/DC converter
that can deliver up to 3A output current from a 4.5V to 23V input supply. The RT8283A's
current mode architecture and external compensation allow the transient response to be
optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit
provides protection against shorted outputs and soft-start eliminates input current surge
during start-up. The RT8283A also provides output under voltage protection and thermal
shutdown protection. The low current (<3μA) shutdown mode provides output disconnect,
enabling easy power management in batterypowered systems. The RT8283A is available
in a SOP-8 package.
14.2. Features
±1.5% High Accuracy Feedback Voltage
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 340kHz
Output Adjustable from 0.8V to 20V
Up to 95% Efficiency
Thermal Shutdown Protection
14.3. Pinning
47
LC-22LE240
Pin No.
Pin
Name
Description
1
BOOT
Bootstrap for high-side gate driver. Connect a 0.1
μF or
greater ceramic capacitor from BOOT to SW pins.
2
VIN
Input Supply 4.5V to 23V. Must bypass with a suitably
large ceramic capacitor.
3
SW
Phase Node--Connect to external L-C filter..
4, 9 (Exposed
Pad)
GND
Ground.
5
FB
Feedback Input pin is connected to the converter output.
It is used to set the output of the converter to regulate to
the desired value via an internal res divider. For an
adjustable output, an external res divider is connected to
this pin.
6
COMP
Compensation Node. COMP is used to compensate the
regulation Control loop. Connect a series RC network
from COMP to GND. In some cases, an additional
capacitor from COMP to GND is required.
7
EN
Enable Input Pin. Logic high enables the converter; a
logic low forces the RT8253A into shutdown mode.
Attach this pin to VIN with a 100kΩ pull up resistor for
automatic startup.
8
SS
Soft-Start Control Input. SS controls the soft-start period.
Connect a capacitor from SS to GND to set the soft-start
period. A 0.1
period. A 0.1
μF capacitor sets the soft-start period to
13.5ms.
15. MP1583 (U174)
15.1. General Description
The MP1583 is a step-down regulator with a built-in internal Power MOSFET. It achieves
3A of continuous output current over a wide input supply range with excellent load and
line regulation. Current mode operation provides fast transient response and eases loop
stabilization. Fault condition protection includes cycle-by-cycle current limiting and thermal
shutdown. An adjustable soft-start reduces the stress on the input source at start-up. The
MP1583 requires a minimum number of external components, providing a compact
solution.
15.2. Features
3A Output Current
Programmable Soft-Start
100mΩ Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic Capacitors
Up to 95% Efficiency
20μA Shutdown Mode
Fixed 385KHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Wide 4.75V to 23V Operating Input Range
Output Adjustable from 1.22V to 21V
Under-Voltage Lockout
15.3. Pinning
Pin
No.
Pin
Name
Description
1
BOOT
High-Side Gate Drive Bootstrap Input. BS supplies the drive for the
high-side N-Channel MOSFET switch.
2
IN
Power Input. Drive IN with a 4.75V to 23V power source.
3
SW
Power Switching Out is the switching node that supplies power to the
output
4
GND
Ground.
5
FB
Feedback Input. FB senses the output voltage and regulates it. Drive
FB with a resistive voltage divider from the output voltage. FB
threshold is 1.222V.
6
COMP
Compensation Node is used to compensate the regulation control
loop.
7
EN
Enable/UVLO. A voltage greater than 2.71V enables operation. For
complete low current shutdown the EN pin voltage needs to be at less
than 900mV. When the voltage on EN exceeds 1.2V, the internal
regulator will be enabled and the soft-start capacitor will begin to
charge. The MP1583 will start switching after the EN pin voltage
reaches 2.71V.
8
SS
Soft-Start Control Input. SS controls the soft-start period.
16. FDC642
16.1. General Description
This P-Channel 2.5V specified MOSFET is produced using Fairchild’s advanced
PowerTrench
® process that has been especially tailored to minimize on-state resistance
and yet maintain low gate charge for superior switching performance.
These devices have been designed to offer exceptional power dissipation in a very small
footprint for applications where the larger packages are impractical.
16.2. Features
Max rDS(on) = 65 mΩ at VGS = -4.5 V, ID = -4.0 A
Max rDS(on) = 100 mΩ at VGS = -2.5 V, ID = -3.2 A
Fast switching speed
Low gate charge (11nC typical)
48
LC-22LE240
Wide 4.75V to 23V Operating Input Range
Output Adjustable from 1.22V to 21V
Under-Voltage Lockout
15.3. Pinning
Pin
No.
Pin
Name
Description
1
BOOT
High-Side Gate Drive Bootstrap Input. BS supplies the drive for the
high-side N-Channel MOSFET switch.
2
IN
Power Input. Drive IN with a 4.75V to 23V power source.
3
SW
Power Switching Out is the switching node that supplies power to the
output
4
GND
Ground.
5
FB
Feedback Input. FB senses the output voltage and regulates it. Drive
FB with a resistive voltage divider from the output voltage. FB
threshold is 1.222V.
6
COMP
Compensation Node is used to compensate the regulation control
loop.
7
EN
Enable/UVLO. A voltage greater than 2.71V enables operation. For
complete low current shutdown the EN pin voltage needs to be at less
than 900mV. When the voltage on EN exceeds 1.2V, the internal
regulator will be enabled and the soft-start capacitor will begin to
charge. The MP1583 will start switching after the EN pin voltage
reaches 2.71V.
8
SS
Soft-Start Control Input. SS controls the soft-start period.
16. FDC642
16.1. General Description
This P-Channel 2.5V specified MOSFET is produced using Fairchild’s advanced
PowerTrench
® process that has been especially tailored to minimize on-state resistance
and yet maintain low gate charge for superior switching performance.
These devices have been designed to offer exceptional power dissipation in a very small
footprint for applications where the larger packages are impractical.
16.2. Features
Max rDS(on) = 65 mΩ at VGS = -4.5 V, ID = -4.0 A
Max rDS(on) = 100 mΩ at VGS = -2.5 V, ID = -3.2 A
Fast switching speed
Low gate charge (11nC typical)
High performance trench technology for extremely low rDS(on)
SuperSOTTM-6 package: small footprint (72% smaller than standard SO-8);
low profile (1 mm thick)
Termination is Lead-free and RoHS Compliant
16.3. Pinning
17. FDC604P
17.1. General Description
This P-Channel 1.8V specified MOSFET uses Fairchild’s low voltage PowerTrench
process. It has been optimized for battery power management applications.
17.2. Features
–5.5 A, –20 V. RDS(ON) = 33 mΩ @ VGS = –4.5 V
RDS(ON) = 43 mΩ @ VGS = –2.5 V
RDS(ON) = 60 mΩ @ VGS = –1.8 V
Fast switching speed.
High performance trench technology for extremely low RDS(ON)(S)
17.3. Pinning
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