Datasheet LT8625S (Analog Devices) - 5
| Hersteller | Analog Devices |
| Beschreibung | 18V/8A Step-Down Silent Switcher 3 with Ultralow Noise Reference |
| Seiten / Seite | 39 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| Dateiformat / Größe | PDF / 4.9 Mb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Noise Spectral Density vs Load
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LT8625S
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Noise Spectral Density vs Load Noise Spectral Density vs CSET Noise Spectral Density vs CSET
1000 1000 1000 I C LOAD = 50mA (8µVRMS) SET = 100nF (8.9µVRMS) CSET = 100nF (4µVRMS) I C LOAD = 1A (8.25µVRMS) SET = 470nF (8.55µVRMS) CSET = 470nF (3.75µVRMS) I C LOAD = 2A (8.6µVRMS) SET = 1µF (8.5µVRMS) CSET = 1µF (3.5µVRMS) I ) C LOAD = 4A (8.8µVRMS) SET = 4.7µF (8.5µVRMS) CSET = 4.7µF (3.46µVRMS) I C LOAD = 8A (9.6µVRMS) /√Hz SET = 10µF (8.46µVRMS) C 100 /√Hz 100 LNA NOISE FLOOR SET = 10µF (3.44µVRMS) /√Hz 100 LNA NOISE FLOOR (INTEGRATED NOISE SV FROM 10Hz TO 100kHz) IN = PVIN = 12V SVIN = PVIN = 12V SVIN = PVIN = 12V 10 10 10 OUTPUT NOISE (nV OUTPUT NOISE (nV OUTPUT NOISE (nV fSW = 2MHz, VOUT = 1V f f = 4MHz, V 1 SW = 2MHz, VOUT = 1V, ILOAD = 2A 1 SW OUT = 1V, ILOAD = 2A 1 10 100 1k 10k 100k 1M 10 100 1k 10k 100k 1M 10 100 1k 10k 100k 1M FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) 8625s G04 8625s G05 8625s G06 TYPICAL APPLICATION CIRCUIT TA03 (2MHz) (INTEGRATED NOISE FROM (INTEGRATED NOISE FROM 10Hz TO 100kHz) 10Hz TO 100kHz) TYPICAL APPLICATION CIRCUIT TA03 (2MHz) TYPICAL APPLICATION CIRCUIT TA02 (4MHz)
Noise Spectral Density as a Function of Noise Spectral Density Error Amplifier Input Pair Noise Spectral Density vs fSW (0.1Hz to 10Hz)
1000 1000 1000 VIN = 12V, PNP (8.4µVRMS) fSW = 2MHz (8.5µVRMS) VIN = 5V, PNP (8µVRMS) fSW = 4MHz (3.46µVRMS) VIN = 4.3V, NPN (10.5µVRMS) LNA NOISE FLOOR ) LNA NOISE FLOOR ) /√Hz (INTEGRATED NOISE FROM 100 SVIN = PVIN = 12V /√Hz 100 10Hz TO 100kHz) /√Hz SVIN = PVIN = 12V 100 10 10 OUTPUT NOISE (nV OUTPUT NOISE (nV OUTPUT NOISE (nV PVIN = SVIN = 12V, VOUT = 1V fSW = 2MHz, VOUT = 3.32V, ILOAD = 2A V RSET = 10kΩ, CSET = 4.7µF 1 OUT = 1V, ILOAD = 2A 1 10 10 100 1k 10k 100k 1M 10 100 1k 10k 100k 1M 0.1 1 10 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) 8625s G07 8625s G08 8625s G09 (INTEGRATED NOISE FROM REFER TO TYPICAL APPLICATION 10Hz TO 100kHz) CIRCUITS TA03 (2MHz) AND TA02 (4MHz) TYPICAL APPLICATION CIRCUIT TA07 (3.3V)
Power Supply Ripple Rejection Power Supply Ripple Rejection
140 100 DEMOBOARD APPLICATION CIRCUIT DEMOBOARD APPLICATION CIRCUIT 90 120 PVIN = 5V, VOUT = 1V PVIN = 12V, VOUT = 1V 80 100 70 60 80 50 60 PSRR (dB) PSRR (dB) 40 40 30 fSW = 2MHz, ILOAD = 0A 20 f 20 SW = 2MHz, ILOAD = 8A ILOAD = 0A f 10 SW = 1MHz, ILOAD = 0A ILOAD = 8A fSW = 1MHz, ILOAD = 8A 100 1k 10k 100k 1M 100 1k 10k 100k 400k FREQUENCY (Hz) FREQUENCY (Hz) 8625s G10 8625s G11 Rev. B For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Noise Spectral Density vs Load Noise Spectral Density vs CSET Noise Spectral Density vs CSET
1000 1000 1000 I C LOAD = 50mA (8µVRMS) SET = 100nF (8.9µVRMS) CSET = 100nF (4µVRMS) I C LOAD = 1A (8.25µVRMS) SET = 470nF (8.55µVRMS) CSET = 470nF (3.75µVRMS) I C LOAD = 2A (8.6µVRMS) SET = 1µF (8.5µVRMS) CSET = 1µF (3.5µVRMS) I ) C LOAD = 4A (8.8µVRMS) SET = 4.7µF (8.5µVRMS) CSET = 4.7µF (3.46µVRMS) I C LOAD = 8A (9.6µVRMS) /√Hz SET = 10µF (8.46µVRMS) C 100 /√Hz 100 LNA NOISE FLOOR SET = 10µF (3.44µVRMS) /√Hz 100 LNA NOISE FLOOR (INTEGRATED NOISE SV FROM 10Hz TO 100kHz) IN = PVIN = 12V SVIN = PVIN = 12V SVIN = PVIN = 12V 10 10 10 OUTPUT NOISE (nV OUTPUT NOISE (nV OUTPUT NOISE (nV fSW = 2MHz, VOUT = 1V f f = 4MHz, V 1 SW = 2MHz, VOUT = 1V, ILOAD = 2A 1 SW OUT = 1V, ILOAD = 2A 1 10 100 1k 10k 100k 1M 10 100 1k 10k 100k 1M 10 100 1k 10k 100k 1M FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) 8625s G04 8625s G05 8625s G06 TYPICAL APPLICATION CIRCUIT TA03 (2MHz) (INTEGRATED NOISE FROM (INTEGRATED NOISE FROM 10Hz TO 100kHz) 10Hz TO 100kHz) TYPICAL APPLICATION CIRCUIT TA03 (2MHz) TYPICAL APPLICATION CIRCUIT TA02 (4MHz)
Noise Spectral Density as a Function of Noise Spectral Density Error Amplifier Input Pair Noise Spectral Density vs fSW (0.1Hz to 10Hz)
1000 1000 1000 VIN = 12V, PNP (8.4µVRMS) fSW = 2MHz (8.5µVRMS) VIN = 5V, PNP (8µVRMS) fSW = 4MHz (3.46µVRMS) VIN = 4.3V, NPN (10.5µVRMS) LNA NOISE FLOOR ) LNA NOISE FLOOR ) /√Hz (INTEGRATED NOISE FROM 100 SVIN = PVIN = 12V /√Hz 100 10Hz TO 100kHz) /√Hz SVIN = PVIN = 12V 100 10 10 OUTPUT NOISE (nV OUTPUT NOISE (nV OUTPUT NOISE (nV PVIN = SVIN = 12V, VOUT = 1V fSW = 2MHz, VOUT = 3.32V, ILOAD = 2A V RSET = 10kΩ, CSET = 4.7µF 1 OUT = 1V, ILOAD = 2A 1 10 10 100 1k 10k 100k 1M 10 100 1k 10k 100k 1M 0.1 1 10 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) 8625s G07 8625s G08 8625s G09 (INTEGRATED NOISE FROM REFER TO TYPICAL APPLICATION 10Hz TO 100kHz) CIRCUITS TA03 (2MHz) AND TA02 (4MHz) TYPICAL APPLICATION CIRCUIT TA07 (3.3V)
Power Supply Ripple Rejection Power Supply Ripple Rejection
140 100 DEMOBOARD APPLICATION CIRCUIT DEMOBOARD APPLICATION CIRCUIT 90 120 PVIN = 5V, VOUT = 1V PVIN = 12V, VOUT = 1V 80 100 70 60 80 50 60 PSRR (dB) PSRR (dB) 40 40 30 fSW = 2MHz, ILOAD = 0A 20 f 20 SW = 2MHz, ILOAD = 8A ILOAD = 0A f 10 SW = 1MHz, ILOAD = 0A ILOAD = 8A fSW = 1MHz, ILOAD = 8A 100 1k 10k 100k 1M 100 1k 10k 100k 400k FREQUENCY (Hz) FREQUENCY (Hz) 8625s G10 8625s G11 Rev. B For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts