Datasheet LT1076-5 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 5V Step-Down Switching Regulator |
| Páginas / Página | 8 / 1 — FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. Basic Positive … |
| Formato / tamaño de archivo | PDF / 116 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. Basic Positive Buck Converter
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LT1076-5 5V Step-Down Switching Regulator
FEATURES DESCRIPTION
n Fixed 5V Output The LT®1076-5 is a 2A fi xed 5V output monolithic bipolar n 2A On-Board Switch switching regulator which requires only a few external parts n 100kHz Switching Frequency for normal operation. The power switch, all oscillator and n 2% Output Voltage Tolerance Over Temperature control circuitry, all current limit components, and an output n Greatly Improved Dynamic Behavior monitor are included on the chip. The topology is a classic n Available in Low Cost 5- and 7-Lead Packages positive “buck” confi guration but several design innova- n Only 9.5mA Quiescent Current tions allow this device to be used as a positive-to-negative n Operates Up to 60V Input converter, a negative boost converter, and as a fl yback con- verter. The switch output is specifi ed to swing 40V below
APPLICATIONS
ground, allowing the LT1076-5 to drive a tapped inductor in the buck mode with output currents up to 4A. n 5V Output Buck Converter n Tapped Inductor Buck Converter with 4A Output at The LT1076-5 uses a true analog multiplier in the feedback 5V loop. This makes the device respond nearly instantaneously n Positive-to-Negative Converter to input voltage fl uctuations and makes loop gain indepen- dent of input voltage. As a result, dynamic behavior of the regulator is signifi cantly improved over previous designs. On-chip pulse by pulse current limiting makes the LT1076- 5 nearly bust-proof for output overloads or shorts. The input voltage range as a buck converter is 8V to 60V, but a self-boot feature allows input voltages as low as 5V in the inverting and boost confi gurations. The LT1076-5 is available in a low cost 5- and 7-lead TO- 220 packages with frequency pre-set at 100kHz and current limit at 2.6A. See Application Note 44 for design details. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION Basic Positive Buck Converter
100μH**† 5V 8V TO 40V VIN VSW ≤1.8A LT1076-5 MBR340* * MBR330P MAY BE USED FOR VIN ≤ 25V SENSE GND V ** COILTRONICS #100-1-52 C HURRICANE #HL-AG210LL R3 † VALUE MAY BE REDUCED TO 50μH 1.5k + + FOR OUTPUT LOADS BELOW 1.5A C3 C2 C1 200μF 0.033μF 500μF 25V LT1076-5 TA01 10765fc 1
FEATURES DESCRIPTION
n Fixed 5V Output The LT®1076-5 is a 2A fi xed 5V output monolithic bipolar n 2A On-Board Switch switching regulator which requires only a few external parts n 100kHz Switching Frequency for normal operation. The power switch, all oscillator and n 2% Output Voltage Tolerance Over Temperature control circuitry, all current limit components, and an output n Greatly Improved Dynamic Behavior monitor are included on the chip. The topology is a classic n Available in Low Cost 5- and 7-Lead Packages positive “buck” confi guration but several design innova- n Only 9.5mA Quiescent Current tions allow this device to be used as a positive-to-negative n Operates Up to 60V Input converter, a negative boost converter, and as a fl yback con- verter. The switch output is specifi ed to swing 40V below
APPLICATIONS
ground, allowing the LT1076-5 to drive a tapped inductor in the buck mode with output currents up to 4A. n 5V Output Buck Converter n Tapped Inductor Buck Converter with 4A Output at The LT1076-5 uses a true analog multiplier in the feedback 5V loop. This makes the device respond nearly instantaneously n Positive-to-Negative Converter to input voltage fl uctuations and makes loop gain indepen- dent of input voltage. As a result, dynamic behavior of the regulator is signifi cantly improved over previous designs. On-chip pulse by pulse current limiting makes the LT1076- 5 nearly bust-proof for output overloads or shorts. The input voltage range as a buck converter is 8V to 60V, but a self-boot feature allows input voltages as low as 5V in the inverting and boost confi gurations. The LT1076-5 is available in a low cost 5- and 7-lead TO- 220 packages with frequency pre-set at 100kHz and current limit at 2.6A. See Application Note 44 for design details. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION Basic Positive Buck Converter
100μH**† 5V 8V TO 40V VIN VSW ≤1.8A LT1076-5 MBR340* * MBR330P MAY BE USED FOR VIN ≤ 25V SENSE GND V ** COILTRONICS #100-1-52 C HURRICANE #HL-AG210LL R3 † VALUE MAY BE REDUCED TO 50μH 1.5k + + FOR OUTPUT LOADS BELOW 1.5A C3 C2 C1 200μF 0.033μF 500μF 25V LT1076-5 TA01 10765fc 1