Switching Regulator by Hysteretic PFET Buck Controller

LM3485/LM3485Q
Hysteretic PFET Buck Controller
General Description
The LM3485 is a high efficiency PFET switching regulator
controller that can be used to quickly and easily develop a
small, low cost, switching buck regulator for a wide range of
applications. The hysteretic control architecture provides for
simple design without any control loop stability concerns using
a wide variety of external components. The PFET architecture
also allows for low component count as well as ultralow
dropout, 100% duty cycle operation. Another benefit is
high efficiency operation at light loads without an increase in
output ripple.
Current limit protection is provided by measuring the voltage
across the PFET’s RDS(ON), thus eliminating the need for a
sense resistor. The cycle-by-cycle current limit can be adjusted
with a single resistor, ensuring safe operation over a range
of output currents.

Features
- Easy to use control methodology
- No control loop compensation required
- 4.5V to 35V wide input range
- 1.242V to VIN adjustable output range
- High Efficiency 93%
- ฑ1.3% (ฑ2% over temp) internal reference
- 100% duty cycle
- Maximum operating frequency > 1MHz
- Current limit protection
- MSOP-8
- LM3485Q is AEC-Q100 Grade 1 qualified and are
manufactured on an Automotive Grade Flow

LM3485 Datasheet Pdf

Circuit PCB

5A switching regulator with Adjustable Current Limit

Switching Regulator by High-Side N-Channel Controller

LM3477
High Efficiency High-Side N-Channel Controller for
Switching Regulator
Description
The LM3477/A is a high-side N-channel MOSFET switching
regulator controller. It can be used in topologies requiring a
high side MOSFET such as buck, inverting (buck-boost) and
zeta regulators. The LM3477/A’s internal push pull driver
allows compatibility with a wide range of MOSFETs. This, the
wide input voltage range, use of discrete power components
and adjustable current limit allows the LM3477/A to be optimized
for a wide variety of applications.
The LM3477/A uses a high switching frequency of 500kHz to
reduce the overall solution size. Current-mode control requires
only a single resistor and capacitor for frequency
compensation. The current mode architecture also yields
superior line and load regulation and cycle-by-cycle current
limiting. A 5µA shutdown state can be used for power savings
and for power supply sequencing. Other features include
internal soft-start and output over voltage protection.
The internal soft-start reduces inrush current. Over voltage
protection is a safety feature to ensure that the output voltage
stays within regulation.
The LM3477A is similar to the LM3477. The primary difference
between the two is the point at which the device
transitions into hysteretic mode. The hysteretic threshold of
the LM3477A is one-third of the LM3477.

Features
- 500kHz switching frequency
- Adjustable current limit
- 1.5% reference
- Thermal shutdown
- Frequency compensation optimized with a single
capacitor and resistor
- Internal softstart
- Current mode operation
- Undervoltage lockout with hysteresis
- 8-lead Mini-SO8 (MSOP-8) package

LM3477 Datasheet Pdf

Switching Regulator by Hysteretic PFET Buck Controller

5A switching regulator with Adjustable Current Limit

LM2679
5A Step-Down Voltage Regulator
with Adjustable Current Limit

Description
The LM2679 series of regulators are monolithic integrated
circuits which provide all of the active functions for a stepdown
(buck) switching regulator capable of driving up to 5A
loads with excellent line and load regulation characteristics.
High efficiency (>90%) is obtained through the use of a low
ON-resistance DMOS power switch. The series consists of
fixed output voltages of 3.3V, 5V and 12V and an adjustable
output version.
The SIMPLE SWITCHER concept provides for a complete
design using a minimum number of external components. A
high fixed frequency oscillator (260KHz) allows the use of
physically smaller sized components. A family of standard
inductors for use with the LM2679 are available from several
manufacturers to greatly simplify the design process.
Other features include the ability to reduce the input surge
current at power-ON by adding a softstart timing capacitor to
gradually turn on the regulator. The LM2679 series also has
built in thermal shutdown and resistor programmable current
limit of the power MOSFET switch to protect the device and
load circuitry under fault conditions. The output voltage is
guaranteed to a ±2% tolerance. The clock frequency is
controlled to within a ±11% tolerance.

Features
- Efficiency up to 92%
- Simple and easy to design with (using off-the-shelf
external components)
- Resistor programmable peak current limit over a range
of 3A to 7A.
- 120 mΩ DMOS output switch
- 3.3V, 5V and 12V fixed output and adjustable (1.2V to
37V ) versions
- ±2%maximum output tolerance over full line and load
conditions
- Wide input voltage range: 8V to 40V
- 260 KHz fixed frequency internal oscillator
- Softstart capability
- −40 to +125°C operating junction temperature range

LM2679 Datasheet Pdf

dual step-down switching regulator circuit

dual step-down switching regulator circuit

The output voltages
OUT1 0.9 V to 5.5 V
OUT2 0.9 V to 3.3 V

PM6680
No Rsense dual step-down controller with adjustable voltages
for notebook system power

Description
PM6680 is a dual step-down controller
specifically designed to provide extremely high
efficiency conversion, with lossless current
sensing technique. The constant on-time
architecture assures fast load transient response
and the embedded voltage feed-forward provides
nearly constant switching frequency operation. An
embedded integrator control loop compensates
the DC voltage error due to the output ripple.
Pulse skipping technique increases efficiency at
very light load. Moreover a minimum switching
frequency of 33kHz is selectable to avoid audio
noise issues. The PM6680 provides a selectable
switching frequency, allowing three different
values of switching frequencies for the two
switching sections.

Features
- 6 V to 28 V input voltage range
- Adjustable output voltages
- 5 V always voltage available deliver 100 mA
peak current
- 1.237 V ± 1% reference voltage available
- Lossless current sensing using low side
MOSFETs RDS(on)
- Negative current limit
- Soft-start internally fixed at 2ms
- Soft output discharge
- Latched OVP and UVP
- Selectable pulse skipping at light loads
- Selectable minimum frequency (33 kHz) in
pulse skip mode
- 4 mW maximum quiescent power
- Independent power good signals
- Output voltage ripple compensation

PM6680 Datasheet Pdf

10A stepdown switching regulator circuit

10A stepdown switching regulator circuit

TYPICAL PERFORMANCES (using evaluation board)
n = 83% (Vi = 35V ; Vo = VREF ; Io = 10A ; fSW = 200KHz)
Vo RIPPLE = 30mV (at 10A) with output filter capacitor
Line regulation = 5mV (Vi = 15 to 50V)
Load regulation = 15mV (Io = 2 to 10A)
For component values, refer to test circuit part list.

L4970A
DESCRIPTION
The L4970A is a stepdown monolithic power
switching regulator delivering

Frature
- 10A OUTPUT CURRENT
- 5.1V TO 40V OUTPUT VOLTAGE RANGE
- 0 TO 90% DUTY CYCLE RANGE
- INTERNAL FEED-FORWARD LINE REGULATION
- INTERNAL CURRENT LIMITING
- PRECISE 5.1V ± 2% ON CHIP REFERENCE
- RESET AND POWER FAIL FUNCTIONS
- SOFT START
- INPUT/OUTPUT SYNC PIN
- UNDER VOLTAGE LOCK OUT WITH HYSTERETIC
- TURN-ON
- PWM LATCH FOR SINGLE PULSE PER PERIOD
- VERY HIGH EFFICIENCY
- SWITCHING FREQUENCY UP TO 500KHz
- THERMAL SHUTDOWN
- CONTINUOUS MODE OPERATION

L4970A Datasheet Pdf

Power Amplifier Circuit

Single Supply High Power Amplifier Circuit

30W Bridge Amplifier Circuit

BTL stereo car radio power amplifier

Stereo Amplifier with Mute and Stand-by Circuit

125W Class D Audio Power Amplifier

Single Supply 68W Audio Power Amplifier Circuit

stereo headphone audio amplifier circuit

stereo headphone audio amplifier circuit

LM4980
2 Cell Battery, 1mA, 42mW Per Channel High Fidelity
Stereo Headphone Audio Amplifier for MP3 players
Description
The LM4980 is a stereo headphone audio amplifier, which
when connected to a 3.0V supply, delivers 42mW to a 16Ω
load with less than 1% THD+N. With the LM4980 packaged
in the SD package, the customer benefits include low profile
and small size. This package minimizes PCB area and maximizes
output power.
The LM4980 features circuitry that significantly reduces output
transients (“clicks” and “pops”) while driving headphones
during device turn-on and turn-off without costly external
additional circuitry. The LM4980 also includes an externally
controlled low-power consumption active-low shutdown
mode, and thermal shutdown. Boomer audio power amplifiers
are designed specifically to use few external components
and provide high quality output power in a surface
mount package.
Specifications
- Output power
(RL = 16Ω, VDD = 3.0V, THD+N = 1%) 42mW (typ)
- Quiescent current (VDD = 3V) 1mA (typ)
- Micropower shutdown current 0.1µA (typ)
- Supply voltage operating range 1.5V <>

VDD = 3.0V 90dB (typ) - PSRR @ 217Hz, VDD = 3.0V 100dB (typ)

Features

- 2-cell 1.5V to 3.3V battery operation

- Unity-gain stable

- “Click and pop” suppression circuitry for shutdown

and power on/off transient with headphone loads

- Active low micro

-power shutdown

- Thermal shutdown protection circuitry

LM4980 Datasheet Pdf

Single Supply 68W Audio Power Amplifier Circuit

LM3886 Overture™ Audio Power Amplifier Series
High-Performance 68W Audio Power Amplifier w/Mute
General Description
The LM3886 is a high-performance audio power amplifier
capable of delivering 68W of continuous average power to a
4Ω load and 38W into 8Ω with 0.1% THD+N from 20Hz–20kHz.
The performance of the LM3886, utilizing its Self Peak Instantaneous
Temperature (°Ke) (SPiKe™) protection circuitry,
puts it in a class above discrete and hybrid amplifiers
by providing an inherently, dynamically protected Safe Operating
Area (SOA). SPiKe protection means that these
parts are completely safeguarded at the output against overvoltage,
undervoltage, overloads, including shorts to the
supplies, thermal runaway, and instantaneous temperature peaks.
The LM3886 maintains an excellent signal-to-noise ratio of
greater than 92dB with a typical low noise floor of 2.0µV. It
exhibits extremely low THD+N values of 0.03% at the rated
output into the rated load over the audio spectrum, and
provides excellent linearity with an IMD (SMPTE) typical
rating of 0.004%.
Features
- 68W cont. avg. output power into 4Ω at VCC = ±28V
- 38W cont. avg. output power into 8Ω at VCC = ±28V
- 50W cont. avg. output power into 8Ω at VCC = ±35V
- 135W instantaneous peak output power capability
- Signal-to-Noise Ratio ≥ 92dB
- An input mute function
- Output protection from a short to ground or to the
supplies via internal current limiting circuitry
- Output over-voltage protection against transients from
inductive loads
- Supply under-voltage protection, not allowing internal
biasing to occur when VEE + VCC ≤ 12V, thus
eliminating turn-on and turn-off transients
- 11-lead TO-220 package
- Wide supply range 20V - 94V

LM3886 Datasheet Pdf

125W Class D Audio Power Amplifier

The IC combination of the LM4651 driver and the LM4652
power MOSFET provides a high efficiency, Class D subwoofer
amplifier solution.
- Output Power, 1% THD 125W
- Load Impedance 4Ω
- Input Signal level 3V RMS (max)
- Input Signal Bandwidth 10Hz − 150Hz
- Ambient Temperature 50°C (max)
- Supply voltage +- 20V

LM4651
The LM4651 is a fully integrated conventional pulse width
modulator driver IC. The IC contains short circuit, under
voltage, over modulation, and thermal shut down protection
circuitry. The LM4651also contains a standby function which
shuts down the pulse width modulation minimizing supply
current. The LM4652 is a fully integrated H-bridge power
MOSFET IC in a TO-220 power package. The LM4652 has a
temperature sensor built in to alert the LM4651 when the die
temperature of the LM4652 exceeds the threshold. Together,
these two IC’s form a simple, compact high power audio
amplifier solution complete with protection normally seen
only in Class AB amplifiers. Few external components and
minimal traces between the IC’s keep the PCB area small
and aids in EMI control.

Features
- Conventional pulse width modulation.
- Externally controllable switching frequency.
- 50kHz to 200kHz switching frequency range.
- Integrated error amp and feedback amp.
- Turn−on soft start and under voltage lockout.
- Over modulation protection (soft clipping).
- Externally controllable output current limiting and
thermal shutdown protection.
- Self checking protection diagnostic.

LM4651 Datasheet Pdf

Stereo Amplifier with Mute and Stand-by Circuit

SINGLE SUPPLY

TDA7499
6 + 6W STEREO AMPLIFIER WITH MUTE AND STAND-BY
DESCRIPTION
The UTC TDA7499 is class AB dual Audio Power Amplifier
and designed for high quality sound application as Hi-Fi
music centers and stereo TV sets.

FEATURES
- Wide supply voltage range up to ±18V
- 6 + 6W @ THD =10%, RL = 8Ω, VS = +14V
- No POP at Turn-On/Off
- MUTE (POP free)
- STAND-BY feature (Low Iq)
- Short circuit protection to GND
- Thermal overload protection

MUTE/STAND-BY FUNCTION
MUTE/STAND-BY function is assembled at pin 5 and to control
the amplifier status by two different thresholds,referred to +VS.
-When Vpin5 higher than = +VS - 2.5V the amplifier is in Stand-by
mode and the final stage generators are off
-When Vpin5 is between +VS - 2.5V and +VS - 6V the final stage
current generators are switched on and the amplifier is in mute mode
-When Vpin5 is lower than +VS - 6V the amplifier is play mode.

TDA7499 Datasheet Pdf

BTL stereo car radio power amplifier

TDA1557Q
2 x 22 W BTL stereo car radio power
amplifier with speaker protection
The TDA1557Q is a monolithic integrated class-B output
amplifier in a 13-lead single-in-line (SIL) plastic power
package. The device contains 2 x 22 W amplifiers in BTL
configuration and has been primarily developed for car
radio applications.

FEATURES
- Requires very few external components
- High output power
- Low offset voltage at output
- Fixed gain
- Good ripple rejection
- Mute/stand-by switch
- Load dump protection
- AC and DC short-circuit-safe to ground and VP
- Thermally protected
- Reverse polarity safe
- Capability to handle high energy on outputs (VP = 0)
- Protected against electrostatic discharge
- No switch-on/switch-off plop
- Flexible leads
- Low thermal resistance.

TDA1557Q Datasheet Pdf

Stepper motor driver circuit

Stepper Motor Data

• Stepper Motor Data 1
• Stepper Motor Data 2
• Stepper Motor Data 3
• Microstepping Data

Stepper Motor Driver Circuit

• 2A Step Motor Driver Circuit
• bipolar stepper motor with current control
• Microstep Stepper motor driver circuit
• Precision Microstepping Driver Circuit
• High Current Microstep Stepper Motor Driver

30W Bridge Amplifier Circuit

TDA2040
20W Hi-Fi AUDIO POWER AMPLIFIER
DESCRIPTION
The TDA2040 is a monolithic integrated circuit in
Pentawatt[ package,intended for use as an audio
class AB amplifier. Typically it provides22W output
power (d = 0.5%) at Vs = 32V/4W . The TDA2040
provides high output current and has very low
harmonic and cross-over distortion. Further the
device incorporates a patented short circuit protection
system comprising an arrangement for automaticallylimiting
the dissipatedpowersoas to keep
the working point of the output transistors within
their safe operating area. A thermal shut-down
system is also included.

ABSOLUTE MAXIMUM RATINGS
Vs Supply Voltage ± 20 V
Vi Input Voltage Vs
Vi Differential Input Voltage ± 15 V
Io Output Peak Current (internally limited) 4 A
Ptot Power Dissipation at Tcase = 75 °C 25 W
Tstg, Tj Storage and Junction Temperature – 40 to + 150 °C

TDA2040 Datasheet Pdf

Single Supply High Power Amplifier Circuit

TDA2030A

18W Hi-Fi AMPLIFIER AND 35W DRIVER
DESCRIPTION
The TDA2030A is a monolithic IC in Pentawatt Ò
package intended for use as low frequency class
AB amplifier.
With VS max = 44V it is particularly suited for more
reliable applications without regulated supply and
for 35W driver circuits using low-cost complementary
pairs.
The TDA2030A provides high output current and
has very low harmonic and cross-over distortion.
Further the device incorporates a short circuit protection
system comprising an arrangement for
automatically limiting the dissipated power so as to
keep the working point of the output transistors
within their safe operating area. A conventional
thermal shut-down system is also included.

SHORT CIRCUIT PROTECTION
The TDA2030A has an original circuit which limits
the current of the output transistors. This function
can be considered as being peak power limiting
rather than simple current limiting. It reduces the
possibility that the device gets damaged during an
accidental short circuit from AC output to ground.
THERMAL SHUT-DOWN
The presence of a thermal limiting circuit offers the
following advantages:
1. An overload on the output (even if it is
permanent), or an above limit ambient
temperature can be easily supported since the
Tj cannot be higher than 150 C.

2. The heatsink can have a smaller factor of safety
compared with that of a conventional circuit.
There is no possibility of device damage due to
high junction temperature. If for any reason, the
junction temperature increases up to 150 C,
the thermal shut-down simply reduces the
power dissipat ion and the current
consumption.

TDA2030A Datasheet Pdf