DESCRIPTION
The UCD9220 is a multi-rail, multi-phase synchronous buck digital PWM controller designed for non-isolated DC/DC power applications. This device integrates dedicated circuitry for DC/DC loop
management with flash memory and a serial interface to support configuration, monitoring and management.
The UCD9220 was designed to provide a wide variety of desirable features for non-isolated DC/DC converter applications while minimizing the total system component count by reducing external circuits. The solution integrates multi-loop management with sequencing, margining, tracking and intelligent phase management to optimize for total system efficiency. Additionally, loop compensation and calibration are supported without the need to add external components.
To facilitate configuring the device, the Texas Instruments Fusion Digital Power™ Designer is provided. This PC based Graphical User Interface offers an intuitive interface to the device. This tool allows the design engineer to configure the system operating parameters for the application, store the configuration to on-chip non-volatile memory and observe both frequency domain and time domain simulations for each of the power stage outputs.
TI has also developed multiple complementary power stage solutions – from discrete drives in the UCD7k family to fully tested power train modules in the PTD family. These solutions have been developed to complement the UCD9k family of system power controllers.

FEATURES
*Fully Configurable Multi-Output and Multi-Phase Non-Isolated DC/DC PWM Controller
*Controls Up To Two Voltage Rails and Up To Four Phases
*Supports Switching Frequencies Up to 2MHz With 250 ps Duty-Cycle Resolution
*Up To 1mV Closed Loop Resolution
*Hardware-Accelerated, 3-Pole/3-Zero Compensator With Non-Linear Gain for Improved Transient Performance
*Supports Multiple Soft-Start and Soft-Stop Configurations Including Prebias Start-up
*Supports Voltage Tracking, Margining and Sequencing
*Supports Current and Temperature Balancing for Multi-Phase Power Stages
*Supports Phase Adding/Shedding for Multi-Phase Power Stages
*Sync In /Out Pins Align DPWM Clocks Between Multiple UCD9220 Devices
*12-Bit Digital Monitoring of Power Supply Parameters Including:
-Input Current and Voltage
-Output Current and Voltage
-Temperature at Each Power Stage
*Multiple Levels of Overcurrent Fault Protection:
-External Current Fault Inputs
-Analog Comparators Monitor Current Sense Voltage
-Current Digitally Monitored
*Over and Undervoltage Fault Protection
*Overtemperature Fault Protection
*Enhanced Nonvolatile Memory With Error Correction Code (ECC)
*Device Operates From a Single Supply With an Internal Regulator Controller That Allows Operation Over a Wide Supply Voltage Range
*Supported by Fusion Digital Power™ Designer, a Full Featured PC Based Design Tool to Simulate, Configure, and Monitor Power Supply Performance.

APPLICATIONS
*Industrial/ATE
*Networking Equipment
*Telecommunications Equipment
*Servers
*Storage Systems
*FPGA, DSP and Memory Power

UCD9220RGZR, UCD9220RGZT

Description
The IR3640M is a synchronous Buck PWM controller designed for performance demanding DC/DC applications. The single loop voltage mode architecture simplifies design while delivery precise output voltage regulation and fast transient response. Because of its wide input and output voltage range it can be used in a large variety of point of load applications within a system and across different markets.
The part is designed to drive a pair of N-Channel MOSFETs from 250kHz to 1.5Mhz switching frequency giving designers the flexibility to optimize the solution for best efficiency or smallest footprint. The output voltage can be precisely regulated from as low as 0.7V within a tolerance of +/-1% over temperature, line and load variations.
The device also integrates a diversity of features including; programmable soft start, pre-bias start up, voltage tracking, external synchronization, enable input and Power Good output. Fault protection features include thermal shutdown, over voltage and over current shutdown and under voltage lock out.

Features
*4.5V to 5.5V external supply
*Wide Input voltage from 1.5V to 24V
*Output voltage range: 0.7V to 0.9*Vin
*Programmable switching frequency up to 1.5MHz
*Programmable Soft-start
*Hiccup mode over current protection using Rds(on) sensing
*Programmable OCP
*Reference voltage 0.7V (+/-1%, 0oC <Tj<125oC)
*Enhanced Pre-bias start up
*Output voltage tracking
*Integrated MOSFET drivers and bootstrap diode
*Operating temp: -40oC <Tj<125oC
*External synchronization
*Power Good output
*Thermal shut down
*Over voltage protection
*Enable Input with voltage monitoring capability
*Pb-Free & Halogen-Free (RoHS Compliant)
*20 -Lead MLPQ package (3mmx4mm)

Applications
*Point of Load Power Architectures
*Server & Netcom Applications
*Game Consoles
*General DC/DC Converters

Description
The highly integrated SG6742HL/HR PWM controller provides several features to enhance the performance of flyback converters.
To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency at light-load conditions. To avoid acoustic-noise problems, the minimum PWM frequency is set above 22KHz. This green-mode function enables the power supply to meet international power conservation requirements. With the internal high-voltage startup circuitry, the power loss due to bleeding resistors is eliminated. To further reduce power consumption, SG6742HL/HR is manufactured using the BiCMOS process, which allows an operating current of 2.7mA.
SG6742HL/HR integrates a frequency-hopping function internally that helps reduce EMI emission of a power supply with minimum line filters. Its built-in synchronized slope compensation achieves stable peak-current-mode control. The proprietary, internal line compensation ensures constant output power limit over a wide AC input voltage range, from 90VAC to 264VAC.
SG6742HL/HR provides many protection functions. In addition to cycle-by-cycle current limiting, the internal open-loop protection circuit ensures safety should an open-loop or output short-circuit failure occur. PWM output is disabled until VDD drops below the UVLO lower limit, when the controller starts up again. As long as VDD exceeds ~25V, the internal OVP circuit is triggered.
SG6742HL/HR is available in an 8-pin SOP package.

Features
*High-Voltage Startup
*Low Operating Current: 2.7mA
*Linearly Decreasing PWM Frequency to 22KHz
*Frequency Hopping to Reduce EMI Emission
*Fixed PWM Frequency: 100KHz
*Peak-Current-Mode Control
*Cycle-by-Cycle Current Limiting
*Leading-Edge Blanking (LEB)
*Synchronized Slope Compensation
*Internal Open-Loop Protection
*GATE Output Maximum Voltage Clamp: 18V
*VDD Under-Voltage Lockout (UVLO)
*VDD Over-Voltage Protection (OVP)
*Programmable Over-Temperature Protection (OTP)
*Internal Latch Circuit (OVP, OTP)
*Internal-Sense, Short-Circuit Protection
*Built-in 6ms Soft-Start Function
*Constant Power Limit (Full AC Input Range)
*Internal OTP Sensor with Hysteresis

Applications
General-purpose switch-mode power supplies and flyback power converters, including:
*Power Adapters
*Open-Frame SMPS

SG6742HLSY, SG6742HRSY

DESCRIPTION
The APU3048 IC combines a Dual synchronous Buck controller and a linear regulator controller, providing a cost-effective, high performance and flexible solution for multi-output applications. The Dual synchronous controller is configured as 2-independent PWM controller. APU3048 provides a separate adjustable output by driving a switch as a linear regulator. This device features an internal 200KHz oscillator, under-voltage lockout for all input supplies, an external programmable soft start function as well as output under-voltage detection that latches off the device when an output short is detected.

FEATURES
*Dual Synchronous Controller in 16-Pin Package with 1808 out-of-phase operation
*LDO Controller with 40mA drive
*Configured as 2-Independent PWM Controller
*Flexible, Same or Separate Supply Operation
*Operation from 4V to 25V Input
*Internal 200KHz Oscillator
*Soft-Start controls all outputs
*Fixed Frequency Voltage Mode
*500mA Peak Output Drive Capability
*Programmable Outputs
*RoHS Compliant

APPLICATIONS
*DDR Memory Source Sink Vtt Application
*Graphic Card
*Hard Disk Drive
*Power supplies requiring multiple outputs

APU3048O, APU3048M

DESCRIPTION
The AIC1594 series are step-down monolithic PWM regulators delivering 1A at fixed voltages of 2.5V , 3.3V, 5.0V , 12V and using a external divider to adjust output voltage from 1.25V to 30V with excellent line and load regulation.
Switching frequency up to 150KHz/300KHz are achievable thus allowing smaller sized filter components. Internal current limit and thermal shutdown circuits provide protection from overloads. It also provides output overvoltage and short protection under fault conditions.
The internal precious reference combined with voltage feedback loop provides optimum output voltage accuracy and fast load transient response. Packages available are in standard SOT89-5 and DIP8 for standard assembly and TO263-5, SOP8 for SMD.

FEATURES
*Operating Input Voltage From 4.5V to 36V
*2.5V, 3.3V, 5V , 12V and Adjustable Output Version
*Adjustable Version Output Voltage Range , 1.25V to 30V ± 4% max Over Line and Load Regulation
*Available in TO220-5 and TO263-5 Package
*Requires Only 4 External Components.
*150KHz/300KHz Fixed Constant Frequency
*Low Power Standby Mode, IQ Typically 80μA
*TTL Shutdown Capability.
*Output Overvoltage Protection
*Current Limit and Thermal Shutdown Protection.
*1A Guaranteed Output Current

APPLICATIONS
*Simple High Efficiency Step-down regulator
*On-Card Switching regulators

AIC1594A-25CM, AIC1594B-25CM, AIC1594A-33CM, AIC1594B-33CM

DESCRIPTION
The AIC1595 series are step-down monolithic PWM regulators delivering 2A at fixed voltages of
2.5V , 3.3V, 5.0V , 12V and using a external divider to adjust output voltage from 1.25V to 30V
with excellent line and load regulation.
Switching frequency up to 150KHz/300KHz are achievable thus allowing smaller sized filter components. Internal current limit and thermal shutdown circuits provide protection from overloads. It also provides output overvoltage and short protection under fault conditions.
The internal precious reference combined with voltage feedback loop provides optimum output
voltage accuracy and fast load transient response.
Packages available are in standard TO220-5 for standard assembly and TO263-5 for SMD.

FEATURES
*Operating Input Voltage From 4.5V to 36V
*2.5V, 3.3V, 5V , 12V and Adjustable Output Version
*Adjustable Version Output Voltage Range , 1.25Vto 30V ± 4% max Over Line and Load Regulation
*Available in TO220-5 and TO263-5 Package
*Requires Only 4 External Components.
*150KHz/300KHz Fixed Constant Frequency
*Low Power Standby Mode, IQ Typically 80μA
*TTL Shutdown Capability.
*Output Overvoltage Protection
*Current Limit and Thermal Shutdown Protection.
*2A Guaranteed Output Current

APPLICATIONS
*Simple High Efficiency Step-down regulator
*On-Card Switching regulators
*Fixed Voltage power supply for LCD Monitor

AIC1595ACM, AIC1595A-25CM, AIC1595A-33CM, AIC1595A-50CM, AIC1595A-12CM
AIC1595ACT, AIC1595A-25CT, AIC1595A-33CT, AIC1595A-50CT, AIC1595A-12CT

GENERAL DESCRIPTION
The ACT6390/ACT6391 are high-performance, fixed-frequency, current-mode PWM step-up
DC/DC converters that incorporate internal power MOSFETs. The ACT6390 includes an integrated 0.2Ω power MOSFET that supports peak currents of up to 1.7A, while the ACT6391’s integrated 0.15Ω power MOSFET supports currents of up to 2.5A.
The ACT6390 and ACT6391 both utilize simple external loop compensation and a pin-selectable
fixed-frequency of either 700kHz or 1.3MHz, allowing optimization between component size, cost, and AC performance across a wide range of applications. Additional functions include an externally programmable soft-start function for easy inrush current control, internal over-voltage protection (OVP), cycle-by-cycle current limit protection, and thermal shutdown.
Both the ACT6390 and the ACT6391 are available in the small 8-pin MSOP-8 package.

FEATURES
*Greater than 90% Efficiency
*Adjustable Output Voltage Up to 12V
*Internal 14V Power MOSFET
*Two Peak Current Options:
− ACT6390: 1.7A, 0.2Ω
− ACT6391: 2.5A, 0.15Ω
*Selectable 700kHz/1.3MHz Frequency
*Integrated Over-Voltage Protection (OVP)
*Programmable Soft-Start Function
*Thermal Shutdown
*Cycle-by-Cycle Over-Current Protection
*Small MSOP-8 Package

APPLICATIONS
*TFT LCD Monitors
*Battery-Powered Equipment
*Set-Top Boxes
*DSL and Cable Modems and Routers

ACT6391, ACT6390MH-T, ACT6391MH-T

DESCRIPTION
The UCD9240 is a multi-rail, multi-phase synchronous buck digital PWM controller designed for non-isolated DC/DC power applications. This device integrates dedicated circuitry for DC/DC loop management with flash memory and a serial interface to support configurability, monitoring and management.
The UCD9240 was designed to provide a wide variety of desirable features for non-isolated DC/DC converter applications while minimizing the total system component count by reducing external circuits. The solution integrates multi-loop management with sequencing, margining, tracking and intelligent phase management to optimize for total system efficiency. Additionally, loop compensation and calibration are supported without the need to add external components.
To facilitate configuring the device, the Texas Instruments Fusion Digital Power™ Designer is
provided. This PC based Graphical User Interface offers an intuitive interface to the device. This tool allows the design engineer to configure the system operating parameters for the application, store the configuration to on-chip non-volatile memory and observe both frequency domain and time domain simulations for each of the power stage outputs.
TI has also developed multiple complementary power stage solutions – from discrete drives in the UCD7k family to fully tested power train modules in the PTD family. These solutions have been developed to complement the UCD9k family of system power controllers.

FEATURES
*Fully Configurable Multi-Output and Multi-Phase Non-Isolated DC/DC PWM
Controller
*Controls Up To Four Voltage Rails and Up To Eight Phases
*Supports Switching Frequencies Up to 2MHz With 250 ps Duty-Cycle Resolution
*Up To 1mV Closed Loop Resolution
*Hardware-Accelerated, 3-Pole/3-Zero Compensator With Non-Linear Gain for
Improved Transient Performance
*Supports Multiple Soft-Start and Soft-Stop Configurations Including Prebias Start-up
*Supports Voltage Tracking, Margining and Sequencing
*Supports Current and Temperature Balancing for Multi-Phase Power Stages
*Supports Phase Adding/Shedding for Multi-Phase Power Stages
*Sync In /Out Pins Align DPWM Clocks Between Multiple UCD9240 Devices
*Fan Monitoring and Control
*12-Bit Digital Monitoring of Power Supply Parameters Including:
– Input Current and Voltage
– Output Current and Voltage
– Temperature at Each Power Stage
*Multiple Levels of Overcurrent Fault Protection:
– External Current Fault Inputs
– Analog Comparators Monitor Current Sense Voltage
– Current Continually Digitally Monitored
*Over and Undervoltage Fault Protection
*Overtemperature Fault Protection
*Enhanced Nonvolatile Memory With Error Correction Code (ECC)
*Device Operates From a Single Supply With an Internal Regulator Controller That Allows
Operation Over a Wide Supply Voltage Range
*Supported by Fusion Digital Power™ Designer, a Full Featured PC Based Design
Tool to Simulate, Configure, and Monitor Power Supply Performance.

APPLICATIONS
*Industrial/ATE
*Networking Equipment
*Telecommunications Equipment
*Servers
*Storage Systems
*FPGA, DSP and Memory Power

UCD9240PFCR, UCD9240PFC

Description
The A3955 is designed to drive one winding of a bipolar stepper motor in a microstepping mode. The outputs are rated for continuous output currents to ±1.5 A and operating voltages to 50 V. Internal pulse width modulated (PWM) current control combined with an internal three-bit nonlinear digitalto-analog converter allows the motor current to be controlled in full-, half-, quarter-, or eighth-step (microstepping) modes. Nonlinear increments minimize the number of control lines necessary for microstepping. Microstepping provides increased step resolution, and reduces torque variations and resonance problems at low speed.
Internal circuitry determines whether the PWM current-control circuitry operates in a slow (recirculating) current-decay mode, fast (regenerative) current-decay mode, or in a mixed
current-decay mode in which the off-time is divided into a period of fast current decay and with the remainder of the fixed off-time spent in slow current decay. The combination of
user-selectable current-sensing resistor and reference voltage, digitally selected output current ratio; and slow, fast, or mixed current-decay modes provides users with a broad, variable
range of motor control.
Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover-current protection. Special power-up sequencing is not required.
The A3955 is supplied in a choice of two power packages; a 16-pin dual-in-line plastic package with copper heat-sink tabs (suffix ‘B’), and a 16-lead plastic SOIC with internally fused pins (suffix ‘LB’). For both package styles, the thermally enhanced pins are at ground
potential and need no electrical isolation. Both packages are lead (Pb) free, with leadframe plating 100% matte tin.

Features and Benefits
*±1.5 A continuous output current
*50 V output voltage rating
*Internal PWM current control
*3-bit nonlinear DAC
*Fast, mixed fast/slow, and slow current-decay modes
*Internal transient-suppression diodes
*Internal thermal shutdown circuitry
*Crossover-current and UVLO protection

A3955SB-T, A3955SLB-T, A3955SLBTR-T

DESCRIPTION
The APU3146 IC combines a Dual synchronous Buck controller, providing a cost-effective, high performance and flexible solution.
The APU3146 can configured as 2-independent or as 2-phase controller.
The 2-phase configuration is ideal for high current applications.
The APU3146 features 180 out of phase operation which reduces the required input/output capacitance and results to few number of capacitor quantity.
Other key features offered by this device include two independent programmable soft starts, programmable switching frequency up to 500KHz per phase, under voltage lockout function.
The current limit is provided by sensing the lower MOSFET's on-resistance for optimum cost and performance.

FEATURES
* Dual Synchronous Controller with 180 out-of-phase
* Configurable to 2-Independent Outputs or 2-Phase Single Output
* Current Sharing Using Inductor's DCR
* Current Limit using MOSFET's RDS(ON)
* Hiccup/Latched Current Limit
* Latched Over-Voltage Protection
* Vcc from 4.5V to 16V Input
* Programmable Switching Frequency up to 500KHz
* Two Independent Soft-Starts/Shutdowns
* 0.8V Precision Reference Voltage Available
* Power Good Output
* External Frequency Synchronization

APPLICATIONS
* Embedded Computer Systems
* Telecom Systems
* Point of Load Power Architectures