Datasheet LT8604 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | High Efficiency 42V/120mA Synchronous Buck |
| Seiten / Seite | 20 / 1 — FEATURES. DESCRIPTION. High Efficiency 2MHz Synchronous Operation. > … |
| Dateiformat / Größe | PDF / 2.8 Mb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. High Efficiency 2MHz Synchronous Operation. > 90% Efficiency at 50mA, 12VIN to 5VOUT
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LT8604 High Efficiency 42V/120mA Synchronous Buck
FEATURES DESCRIPTION
n
High Efficiency 2MHz Synchronous Operation
The LT®8604 is a compact, high speed synchronous n
> 90% Efficiency at 50mA, 12VIN to 5VOUT
monolithic step-down switching regulator that delivers up n
Ultralow Quiescent Current Burst Mode® Operation
to 120mA with high efficiency at constant switching fre- n
< 2.5µA IQ Regulating 24VIN to 3.3VOUT
quency, even up to 2.2MHz. It accepts a wide input voltage n
Output Ripple < 10mVP-P
range up to 42V, and consumes only 2.5µA of quiescent n
Wide Input Voltage Range: 3.2V to 42V
current. Top and bottom power switches are included with n
Fast Minimum Switch-On Time: 35ns
all necessary circuitry to minimize the need for external n
Adjustable Switching Frequency: 200kHz to 2.2MHz
components. Low ripple Burst Mode operation enables n Allows Tiny Inductors high efficiency down to very low output currents while n Accurate 1V Enable Pin Threshold keeping the output ripple below 10mVP-P. n Internal Compensation Additional features provide for flexible and robust opera- n Output Soft-Start and Tracking tion. Internal compensation with peak current mode topol- n Small 10-Lead 3mm × 2mm Side-Wettable ogy allows the use of small inductors and results in fast DFN Package transient response and good loop stability. The EN/UV pin n AEC-Q100 Qualified for Automotive Applications has an accurate 1V threshold and can be used to program VIN under voltage lockout or to shut down the LT8604
APPLICATIONS
reducing the input supply current to 1µA. A PG flag sig- n nals when VOUT is within ±7.5% of the programmed out- Industrial Sensors n put voltage as well as fault conditions. Thermal shutdown Industrial Internet of Things n provides additional protection. The LT8604 is available in 4mA to 20mA Current Loops n a small 10-Lead 3mm × 2mm DFN package with exposed Flow Meters n pad for low thermal resistance. Automotive Housekeeping Supplies All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION 5V, Step-Down Converter Efficiency at VOUT = 5V
100 VIN V f IN 5.9V TO 42V BST SW = 700kHz 95 V 1µF IN = 12V LT8604 47nF 100µH V 90 OUT OFF ON EN/UV SW 5V VIN = 36V 1µF 120mA 85 VIN = 24V INTVCC BIAS 80 75 TR/SS PG EFFICIENCY (%) 70 1M RT FB GND 65 8604 TA01a 187k 10µF 60.4k 60 0 20 40 60 80 100 120 fSW = 700kHz LOAD CURRENT (mA) 8604 TA01b Rev. 0 Document Feedback For more information www.analog.com 1 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
FEATURES DESCRIPTION
n
High Efficiency 2MHz Synchronous Operation
The LT®8604 is a compact, high speed synchronous n
> 90% Efficiency at 50mA, 12VIN to 5VOUT
monolithic step-down switching regulator that delivers up n
Ultralow Quiescent Current Burst Mode® Operation
to 120mA with high efficiency at constant switching fre- n
< 2.5µA IQ Regulating 24VIN to 3.3VOUT
quency, even up to 2.2MHz. It accepts a wide input voltage n
Output Ripple < 10mVP-P
range up to 42V, and consumes only 2.5µA of quiescent n
Wide Input Voltage Range: 3.2V to 42V
current. Top and bottom power switches are included with n
Fast Minimum Switch-On Time: 35ns
all necessary circuitry to minimize the need for external n
Adjustable Switching Frequency: 200kHz to 2.2MHz
components. Low ripple Burst Mode operation enables n Allows Tiny Inductors high efficiency down to very low output currents while n Accurate 1V Enable Pin Threshold keeping the output ripple below 10mVP-P. n Internal Compensation Additional features provide for flexible and robust opera- n Output Soft-Start and Tracking tion. Internal compensation with peak current mode topol- n Small 10-Lead 3mm × 2mm Side-Wettable ogy allows the use of small inductors and results in fast DFN Package transient response and good loop stability. The EN/UV pin n AEC-Q100 Qualified for Automotive Applications has an accurate 1V threshold and can be used to program VIN under voltage lockout or to shut down the LT8604
APPLICATIONS
reducing the input supply current to 1µA. A PG flag sig- n nals when VOUT is within ±7.5% of the programmed out- Industrial Sensors n put voltage as well as fault conditions. Thermal shutdown Industrial Internet of Things n provides additional protection. The LT8604 is available in 4mA to 20mA Current Loops n a small 10-Lead 3mm × 2mm DFN package with exposed Flow Meters n pad for low thermal resistance. Automotive Housekeeping Supplies All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION 5V, Step-Down Converter Efficiency at VOUT = 5V
100 VIN V f IN 5.9V TO 42V BST SW = 700kHz 95 V 1µF IN = 12V LT8604 47nF 100µH V 90 OUT OFF ON EN/UV SW 5V VIN = 36V 1µF 120mA 85 VIN = 24V INTVCC BIAS 80 75 TR/SS PG EFFICIENCY (%) 70 1M RT FB GND 65 8604 TA01a 187k 10µF 60.4k 60 0 20 40 60 80 100 120 fSW = 700kHz LOAD CURRENT (mA) 8604 TA01b Rev. 0 Document Feedback For more information www.analog.com 1 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