Datasheet LT8609, LT8609A, LT8609B (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 42V, 3A Synchronous Step-Down Regulator with 2.5µA Quiescent Current |
| Páginas / Página | 30 / 1 — FEATURES. DESCRIPTION. Wide Input Voltage Range: 3.0V to 42V. Ultralow … |
| Revisión | I |
| Formato / tamaño de archivo | PDF / 2.0 Mb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Wide Input Voltage Range: 3.0V to 42V. Ultralow Quiescent Current Burst Mode® Operation:
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Versión de texto del documento
LT8609/LT8609A/LT8609B 42V, 3A Synchronous Step-Down Regulator with 2.5µA Quiescent Current
FEATURES DESCRIPTION
n
Wide Input Voltage Range: 3.0V to 42V
The LT®8609/LT8609A/LT8609B is a compact, high effi- n
Ultralow Quiescent Current Burst Mode® Operation:
ciency, high speed synchronous monolithic step-down n
<2.5µA IQ Regulating 12VIN to 3.3VOUT
switching regulator that consumes only 1.7µA of non- n
Output Ripple <10mVP-P
switching quiescent current. The LT8609/LT8609A/ n
High Efficiency 2MHz Synchronous Operation:
LT8609B can deliver 3A of continuous current. Burst Mode n
>93% Efficiency at 1A, 5VOUT from 12VIN
operation enables high efficiency down to very low output n
3A Maximum Continuous Output
currents while keeping the output ripple below 10mVP-P. n
Fast Minimum Switch-On Time: 45ns
A SYNC pin allows synchronization to an external clock, or n
LT8609A Available in Fixed 3.3V and 5V Output
spread spectrum modulation for low EMI operation. Internal n
Adjustable and Synchronizable: 200kHz to 2.2MHz
compensation with peak current mode topology allows the n
Spread Spectrum Frequency Modulation for Low EMI
use of small inductors and results in fast transient response n Allows Use of Small Inductors and good loop stability. The EN/UV pin has an accurate n Low Dropout 1V threshold and can be used to program VIN UVLO or to n Peak Current Mode Operation shut down the part. A capacitor on the TR/SS pin programs n Accurate 1V Enable Pin Threshold the output voltage ramp rate during start-up while the PG n Internal Compensation flag signals when VOUT is within ±8.5% on the adjustable n Output Soft-Start and Tracking output parts or ±7.5% on the fixed output parts of the n Small 10-Lead MSOP Package, 16-Lead MSOP Pack- programmed output voltage as well as fault conditions. age, or 10-Lead 3mm × 3mm DFN Package with Side The LT8609A has slower switch edges for lower EMI emis- Wettable Flanks sions. The LT8609B operates in pulse-skipping mode only. n AEC-Q100 Qualified for Automotive Applications
PULSE-SKIPPING MODE, APPLICATIONS Burst Mode OPERATION SWITCH EDGE SPEED
LT8609 Both Fast n GSM Transceivers LT8609A Both Medium n General Purpose Step-Down LT8609B Pulse-Skipping Fast n Low EMI Step-Down All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION 12VIN to 5VOUT Efficiency
100
5V, 2MHz Step-Down
L = 2.2µH 95 fSW = 2MHz VIN 90 VIN BST 6V TO 40V 4.7µF ON OFF EN/UV 0.1µF 2.2µH V 85 OUT SYNC SW 5V 80 10pF 3A LT8609A 75 INTVCC TR/SS PG 1M 70 EFFICIENCY (%) RT FB 65 1µF 18.2k 187k 22µF GND 60 8609 TA01a 55 500.00 0.50 1.00 1.50 2.00 2.50 3 IOUT (A) 8609 TA01b Rev. I Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Wide Input Voltage Range: 3.0V to 42V
The LT®8609/LT8609A/LT8609B is a compact, high effi- n
Ultralow Quiescent Current Burst Mode® Operation:
ciency, high speed synchronous monolithic step-down n
<2.5µA IQ Regulating 12VIN to 3.3VOUT
switching regulator that consumes only 1.7µA of non- n
Output Ripple <10mVP-P
switching quiescent current. The LT8609/LT8609A/ n
High Efficiency 2MHz Synchronous Operation:
LT8609B can deliver 3A of continuous current. Burst Mode n
>93% Efficiency at 1A, 5VOUT from 12VIN
operation enables high efficiency down to very low output n
3A Maximum Continuous Output
currents while keeping the output ripple below 10mVP-P. n
Fast Minimum Switch-On Time: 45ns
A SYNC pin allows synchronization to an external clock, or n
LT8609A Available in Fixed 3.3V and 5V Output
spread spectrum modulation for low EMI operation. Internal n
Adjustable and Synchronizable: 200kHz to 2.2MHz
compensation with peak current mode topology allows the n
Spread Spectrum Frequency Modulation for Low EMI
use of small inductors and results in fast transient response n Allows Use of Small Inductors and good loop stability. The EN/UV pin has an accurate n Low Dropout 1V threshold and can be used to program VIN UVLO or to n Peak Current Mode Operation shut down the part. A capacitor on the TR/SS pin programs n Accurate 1V Enable Pin Threshold the output voltage ramp rate during start-up while the PG n Internal Compensation flag signals when VOUT is within ±8.5% on the adjustable n Output Soft-Start and Tracking output parts or ±7.5% on the fixed output parts of the n Small 10-Lead MSOP Package, 16-Lead MSOP Pack- programmed output voltage as well as fault conditions. age, or 10-Lead 3mm × 3mm DFN Package with Side The LT8609A has slower switch edges for lower EMI emis- Wettable Flanks sions. The LT8609B operates in pulse-skipping mode only. n AEC-Q100 Qualified for Automotive Applications
PULSE-SKIPPING MODE, APPLICATIONS Burst Mode OPERATION SWITCH EDGE SPEED
LT8609 Both Fast n GSM Transceivers LT8609A Both Medium n General Purpose Step-Down LT8609B Pulse-Skipping Fast n Low EMI Step-Down All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION 12VIN to 5VOUT Efficiency
100
5V, 2MHz Step-Down
L = 2.2µH 95 fSW = 2MHz VIN 90 VIN BST 6V TO 40V 4.7µF ON OFF EN/UV 0.1µF 2.2µH V 85 OUT SYNC SW 5V 80 10pF 3A LT8609A 75 INTVCC TR/SS PG 1M 70 EFFICIENCY (%) RT FB 65 1µF 18.2k 187k 22µF GND 60 8609 TA01a 55 500.00 0.50 1.00 1.50 2.00 2.50 3 IOUT (A) 8609 TA01b Rev. I Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts