Details, datasheet, quote on part number: UCC3585D
CategorySemiconductors => Power Management => Non-isolated DC/DC Switching Regulator => Step-Down (Buck) => Buck Controller (External Switch)
Part familyUCC3585 Low Voltage Synchronous Buck Controller
TitleSwitching DC/DC Controllers
DescriptionLow Voltage Synchronous Buck Controller 16-SOIC 0 to 85
CompanyTexas Instruments, Inc.
DatasheetDownload UCC3585D datasheet
Cross ref.Similar parts: UCC2585D, LM3524D, SG2524, SG3524, TL494, UC3524
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  Mecanical Data
Pin nbPackage typeInd stdJEDEC codePackage qtyCarrierDevice markWidth (mm)Length (mm)Thick (mm)Pitch (mm)
16DSOICR-PDSO-G40TUBEUCC3585D 3.919.91.581.27
Application notes
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Features, Applications

FEATURES D VOUT Resistor Programmable Down or 5.0-V Input Supply 1% DC Accuracy D High Efficiency Synchronous Switching D Drives P-Channel (High Side) and N-Channel D

(Low Side) MOSFETs Lossless Programmable Current Limit Logic Compatible Shutdown

The UCC3585 synchronous buck controller provides flexible high efficiency power conversion for output voltages as low 0.9 V with ensured 1% dc accuracy. With an input voltage range it is the ideal choice for 3.3 V only, 5.0 V only, or other low voltage systems. The fixed frequency oscillator is capable of providing practical PWM operation to 500 kHz. The UCC3585 drives a complementary pair of power MOSFET transistors. A P-channel on the high side, and an N-channel on the low side step down the input voltage to 90% efficiency. A programmable two-level current limiting function is provided by sensing the voltage drop across the high side P-channel MOSFET. This circuit can be configured to provide pulseby-pulse limiting, timed shutdown after seven consecutive faults, or latch-off after fault detection, allowing maximum application flexibility. The current limit threshold can be programmed over a wide range with a single resistor.

APPLICATIONS D Local Microprocessor Core Voltage Power D
Supplies for Desktop and Notebook Computers DSP Core or I/O Powering High-Speed GTL Bus Regulation

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

The UCC3585 also includes undervoltage lockout, a logic controlled enable, and softstart functions. The UCC3585 is offered in the 16-pin surface mount and through-hole packages.

absolute maximum ratings over operating free-air temperature (unless otherwise noted)

Analog pins Minimum and maximum forced voltage (reference to GND). 6.3 V Digital pins Minimum and maximum forced voltage (reference to GND). 6.3 V Power driver output pins Maximum forced current. 1.0 A Operating junction temperature, TJ. to 125C Storage temperature, Tstg. to 150C

Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. } Unless otherwise noted, voltages are reference to ground and currents are positive into, negative out of, the specified terminals. Pulsed is defined as a less than 10% duty cycle with a maximum duration of 500 ns. N, D and M PACKAGES (TOP VIEW)


The M and D packages are available taped and reeled. Add an R suffix to the device type (e.g., UCC3585DR). DISSIPATION RATING TABLE PACKAGE TA 25C POWER RATING 580 mW DERATING FACTOR ABOVE 25C 11 mW/C 8.3 mW/C 5.8 mW/C = 70C POWER RATING = 85C POWER RATING 230 mW

electrical characteristics, these specifications hold for 85 C for the UCC3585 and 85 C for the TA = TJ, VIN 3.3 V, ENB, ISENSE = VIN, VFB 0.9 V, COMP = 330 pF, RISET 100 k, RCLSET 10 k (unless otherwise noted) input supply

PARAMETER Supply current total (active) Supply current shutdown VIN turnon threshold (UVLO) VIN turnon hysteresis ENB 1.60 50 TEST CONDITIONS MIN TYP MAX UNITS V mV

PARAMETER TEST CONDITIONS VIN 3.6 V, VIN 3.6 V, See Note 1 VIN 3.6 V, See Note 1 Open loop gain Output voltage high Output voltage low Output source current Output sink current NOTE: 1. Measured on COMP with the error amplifier in a unity gain (voltage follower) configuration. COMP 2.5 V ICOMP 50 A ICOMP = 25C, See Note to 85C, MIN TYP MAX 0.911 0.914 UNITS A mA

PARAMETER VIN 3.3 V Initial accuracy CT ramp peak to valley CT ramp peak CT ramp valley voltage PWM maximum duty cycle PWM delay to outputs Enable high threshold Enable low threshold Softstart charge current NOTE: 3. Enable high threshold = (VIN 0.5). COMP 2.8 V, COMP 2.5 V Measured on ENB, Measured on ENB 85C 10 See Note 3 Measured on PDRV VIN 5.0 V TEST CONDITIONS MIN 345 1.9 TYP MAX UNITS kHz V A


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