Details, datasheet, quote on part number: SLF12565T-4R2N5R5
CategoryDiscrete => Transistors => FETs (Field Effect Transistors) => JFETs (Junction-FETs) => N-Channel
DescriptionN-channel Fet Synchronous Buck Regulator Controller For Low Output Voltages
CompanyNational Semiconductor Corporation
DatasheetDownload SLF12565T-4R2N5R5 datasheet
Find where to buy


Features, Applications
LM2727/LM2737 N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages

The LM2727 and LM2737 are high-speed, synchronous, switching regulator controllers. They are intended to control currents to 20A with to 95% conversion efficiencies. The LM2727 employs output over-voltage and undervoltage latch-off. For applications where latch-off is not desired, the LM2737 can be used. Power up and down sequencing is achieved with the power-good flag, adjustable soft-start and output enable features. The LM2737 and LM2737 operate from a low-current 5V bias and can convert from to 16V power rail. Both parts utilize a fixedfrequency, voltage-mode, PWM control architecture and the switching frequency is adjustable from 2MHz by adjusting the value of an external resistor. Current limit is achieved by monitoring the voltage drop across the onresistance of the low-side MOSFET, which enhances low duty-cycle operation. The wide range of operating frequencies gives the power supply designer the flexibility to finetune component size, cost, noise and efficiency. The adaptive, non-overlapping MOSFET gate-drivers and high-side bootstrap structure helps to further maximize efficiency. The high-side power FET drain voltage can be from to 16V and the output voltage is adjustable down to 0.6V.


n Input power from 16V n Output voltage adjustable down 0.6V n Power Good flag, adjustable soft-start and output enable for easy power sequencing n Output over-voltage and under-voltage latch-off (LM2727) n Output over-voltage and under-voltage flag (LM2737) n Reference Accuracy: 125C) n Current limit without sense resistor n Soft start n Switching frequency from 50 kHz to 2 MHz n TSSOP-14 package


Cable Modems Set-Top Boxes/ Home Gateways DDR Core Power High-Efficiency Distributed Power Local Regulation of Core Power

BOOT (Pin 1) - Supply rail for the N-channel MOSFET gate drive. The voltage should be at least one gate threshold above the regulator input voltage to properly turn on the high-side N-FET. LG (Pin 2) - Gate drive for the low-side N-channel MOSFET. This signal is interlocked with HG to avoid shoot-through problems. PGND (Pins 13) - Ground for FET drive circuitry. It should be connected to system ground. SGND (Pin 4) - Ground for signal level circuitry. It should be connected to system ground. VCC (Pin 5) - Supply rail for the controller. PWGD (Pin 6) - Power Good. This is an open drain output. The pin is pulled low when the chip is in UVP, OVP, or UVLO mode. During normal operation, this pin is connected to VCC or other voltage source through a pull-up resistor. ISEN (Pin 7) - Current limit threshold setting. This sources a fixed 50A current. A resistor of appropriate value should be connected between this pin and the drain of the low-side FET.

EAO (Pin 8) - Output of the error amplifier. The voltage level on this pin is compared with an internally generated ramp signal to determine the duty cycle. This pin is necessary for compensating the control loop. SS (Pin 9) - Soft start pin. A capacitor connected between this pin and ground sets the speed at which the output voltage ramps up. Larger capacitor value results in slower output voltage ramp but also lower inrush current. FB (Pin 10) - This is the inverting input of the error amplifier, which is used for sensing the output voltage and compensating the control loop. FREQ (Pin 11) - The switching frequency is set by connecting a resistor between this pin and ground. SD (Pin - IC Logic Shutdown. When this pin is pulled low the chip turns off the high side switch and turns on the low side switch. While this pin is low, the IC will not start up. An internal 20A pull-up connects this pin to VCC. HG (Pin 14) - Gate drive for the high-side N-channel MOSFET. This signal is interlocked with LG to avoid shootthrough problems.

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VCC BOOTV Junction Temperature Storage Temperature Soldering Information Lead Temperature (soldering, to 150C

Supply Voltage (VCC) Junction Temperature Range Thermal Resistance (JA) +125C 155C/W

VCC = 5V unless otherwise indicated. Typicals and limits appearing in plain type apply for TA=TJ=+25C. Limits appearing in boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Symbol Parameter Conditions VCC to +125C VCC to +125C VFB_ADJ FB Pin Voltage VCC to +125C VCC to +125C VCC to +125C VCC to +125C VON UVLO Thresholds Rising Falling = 0.55V Fsw = 0.65V Fsw 0V FB Voltage Going Up FB Voltage Going Down SS Voltage 0.8 0.15 Min Typ s A Max V Units

Shutdown VCC Current tPWGD1 tPWGD2 ISD ISS-ON PWGD Pin Response Time PWGD Pin Response Time SD Pin Internal Pull-up Current SS Pin Source Current

SS Pin Sink Current During Over SS Voltage = 2.5V Current ISEN Pin Source Current Trip Point Error Amplifier Unity Gain Bandwidth Error Amplifier DC Gain Error Amplifier Slew Rate FB Pin Bias Current EAO Pin Current Sourcing and Sinking Error Amplifier Maximum Swing = 0.65V VEAO = 0.55V VEAO = 0.65V Minimum Maximum to +125C


Some Part number from the same manufacture National Semiconductor Corporation
SLF12575T-1R2N8R2 N-channel Fet Synchronous Buck Regulator Controller For Low Output Voltages
SN54121J 54121 - One-shot With Clear And Complementary Outputs Life-time Buy , Package: Cerdip, Pin Nb=14
SN5486J 5486 - Quad 2-Input Exclusive OR GATE, Package: Cerdip, Pin Nb=14
SN54F253 54F253 - Dual 4-Bit Multiplexer With Tri-state Outputs, Package: Lcc, Pin Nb=20
SN54LS161A DM54LS161A - Synchronous 4-Bit Binary Counter With Asynchronous Clear, Package: Cerdip, Pin Nb=16
SN54LS279A 54LS279 - Quad S-r Latch, Package: Cerdip, Pin Nb=16
SN55182 DS7820A - Dual Line Receivers, Package: Cerdip, Pin Nb=14
SN75276N DS36276 - Failsafe Multipoint Transceiver, Package: Soic Narrow, Pin Nb=8
SN75372 DS0026 - 5 MHZ Two Phase MOS Clock Driver Life-time Buy , Package: Soic Narrow, Pin Nb=8
SN75ALS176 DS16F95 - EIA-485/EIA-422A Differential Bus Transceivers, Package: Lcc, Pin Nb=20
SN75LBC175J DS96F175M - RS-485/RS-422 Quad Differential Receiver, Package: Lcc, Pin Nb=20
SN75LV4735BDLE DS14C335 - +3.3V Supply Tia/eia - 232 3X5 Driver/Receiver, Package: SSOP-EIAJ, Pin Nb=28
SN75LV4737ADBLE DS14C535 - +5V Supply EIA/TIA-232 3 X 5 Driver Receiver, Package: SSOP-EIAJ, Pin Nb=28
SN75LVDS61 DS90CF363 - +3.3V LVDS Transmitter 18-Bit Flat Panel Display (FPD) Link-65 MHZ Life-time Buy , Package: Tssop, Pin Nb=48
SN75LVDS82 DS90CF384 - +3.3V LVDS Receiver 24-Bit Flat Panel Display (FPD) Link-65 Mhz, Package: Tssop, Pin Nb=56
SNJ4040J CD4040BM - CD4040BM, CD4040BC 12-Stage Ripple Carry Binary Counters, Package: Cerdip, Pin Nb=16
SNJ5430J DM54LS30 - 8-Input NAND Gate, Package: Lcc, Pin Nb=20
SNJ5473W DM54173 - 4-Bit Tri-state D Register, Package: Cerdip, Pin Nb=16
SNJ54LS165J DM54LS165 - 8-Bit Parallel In/serial Out Shift Register With Complementary Outputs Life-time Buy , Package: Cerdip, Pin Nb=16
SSI4826DY N-channel Fet Synchronous Buck Regulator Controller For Low Output Voltages

LM2653 : LM2653 - 1.5A High Efficiency Synchronous Switching Regulator, Package: Evaluation Board, Pin Nb=-

LMC6084LN : Precision CMOS Quad Operational Amplifier

LP2987AIM-3.0 : Positive Voltage->Fixed LP2987 - Micropower, 200 ma Ultra Low-dropout Voltage Regulator With Programmable Power-on Reset Delay, Package: Llp, Pin Nb=8

LM2717MT : Dual Step-down DC/DC Converter The LM2717 is composed of two PWM DC/DC buck (step-down) converters. The first converter is used to generate a fixed output voltage of 3.3V. The second converter is used to generate an adjustable output voltage. Both converters feature low RDSON (0.16) internal switch

DS16EV5110SQ : DS16EV5110 Video Equalizer for DVI, HDMI, and CAT5 Cables The DS16EV5110 is a 2.25 Gbps multi-channel equalizer optimized for video cable extension applications. It contains three Transition-Minimized Differential Signaling (TMDS) data channels and one clock channel as commonly found in DVI and HDM

PAL16P6 : Progammable Array Logic Series 24 (PAL Series 24)

2931AM-5.0 : Series Low Dropout Regulators

NM27P512N150 : 524,288-bit (64K x 8) Processor Oriented CMOS Eprom

COP344L-XXX/N : Single-chip N-channel Microcontrollers

0-C     D-L     M-R     S-Z