|Category||Semiconductors => Power Management => Non-isolated DC/DC Switching Regulator => Step-Down (Buck) => Buck Controller (External Switch)|
|Part family||UCC3585 Low Voltage Synchronous Buck Controller|
|Title||Switching DC/DC Controllers|
|Description||Low Voltage Synchronous Buck Controller 16-SOIC 0 to 85|
|Company||Texas Instruments, Inc.|
|Datasheet||Download UCC3585D datasheet
|Cross ref.||Similar parts: UCC2585D, LM3524D, SG2524, SG3524, TL494, UC3524|
|Pin nb||Package type||Ind std||JEDEC code||Package qty||Carrier||Device mark||Width (mm)||Length (mm)||Thick (mm)||Pitch (mm)|
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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 125°C Storage temperature, Tstg. to 150°C
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)
AVAILABLE OPTIONS PACKAGED DEVICES to 85°C DIL (N) UCC2585N UCC3585N SOIC (D) UCC2585D UCC3585D QSOP (M) UCC2585M UCC3585M
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 25°C POWER RATING 580 mW DERATING FACTOR ABOVE 25°C 11 mW/°C 8.3 mW/°C 5.8 mW/°C = 70°C POWER RATING = 85°C 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 µA ICOMP = 25°C, See Note to 85°C, MIN TYP MAX 0.911 0.914 UNITS µA 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 85°C 10 See Note 3 Measured on PDRV VIN 5.0 V TEST CONDITIONS MIN 345 1.9 TYP MAX UNITS kHz V µA
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