Datasheet LT8607, LT8607B (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 42V, 750mA Synchronous Step-Down Regulator with 2.5μA Quiescent Current |
| Seiten / Seite | 22 / 1 — FEATURES. DESCRIPTION. Wide Input Voltage Range: 3.0V to 42V. Ultralow … |
| Revision | C |
| Dateiformat / Größe | PDF / 1.3 Mb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. Wide Input Voltage Range: 3.0V to 42V. Ultralow Quiescent Current Burst Mode. Operation:
Textversion des Dokuments
LT8607/LT8607B 42V, 750mA Synchronous Step-Down Regulator with 2.5µA Quiescent Current
FEATURES DESCRIPTION Wide Input Voltage Range: 3.0V to 42V
The LT®8607 is a compact, high efficiency, high speed syn-
Ultralow Quiescent Current Burst Mode
®
Operation:
chronous monolithic step-down switching regulator that n
<3µA IQ Regulating 12VIN to 3.3VOUT
consumes only 1.7µA of non-switching quiescent current. n
Output Ripple <10mV
The LT8607 can deliver 750mA of continuous current.
P-P High Efficiency 2MHz Synchronous Operation:
Low ripple Burst Mode operation enables high efficiency n
>93% Efficiency at 0.5A, 12V
down to very low output currents while keeping the output
IN to 5VOUT 750mA Maximum Continuous Output
ripple below 10mVP-P. Internal compensation with peak
Fast Minimum Switch-On Time: 35ns
current mode topology allows the use of small inductors
Adjustable and Synchronizable: 200kHz to 2.2MHz
and results in fast transient response and good loop sta-
Spread Spectrum Frequency Modulation for Low EMI
bility. The EN/UV pin has an accurate 1V threshold and Allows Use of Small Inductors can be used to program VIN undervoltage lockout or to Low Dropout shut down the LT8607 reducing the input supply current Peak Current Mode Operation to 1µA. The PG pin signals when VOUT is within ±8.5% of Accurate 1V Enable Pin Threshold the programmed output voltage as well as fault conditions. Internal Compensation The MSOP package includes a SYNC pin to synchronize Output Soft-Start and Tracking to an external clock, or to select Burst Mode operation Small Thermally Enhanced 10-Lead MSOP Package or or pulse-skipping with or without spread spectrum; the 8-Lead 2mm × 2mm DFN Package TR/SS pin programs soft-start or tracking. The DFN pack- age omits these pins and can be purchased in pulse-skip-
APPLICATIONS
ping or Burst Mode operation. General Purpose Step-Down Converter
PACKAGE SYNC FUNCTIONALITY
Low EMI Step Down LT8607MSE MSE Programmable LT8607DFN DFN Burst Mode Operation LT8607BDFN DFN Pulse-Skipping Mode All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION 12VIN to 5VOUT Efficiency 5V, 2MHz Step-Down
100 95 VIN VIN BST 5.7V to 42V 90 EN/UV 0.1µF 4.7µF VOUT 85 SYNC SW 5V 4.7µH 750mA 80 LT8607 100k 75 INTV POWER CC PG GOOD 70 EFFICIENCY (%) 1µF TR/SS 65 FB 10pF 60 10nF RT 22µF L = 4.7µH 55 18.2k GND 187k X7R f 1M SW = 2MHz 1206 50 0 125 250 375 500 625 750 fSW = 2MHz I 8607 TA01a OUT (mA) 8607 TA01b Rev. C Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION Wide Input Voltage Range: 3.0V to 42V
The LT®8607 is a compact, high efficiency, high speed syn-
Ultralow Quiescent Current Burst Mode
®
Operation:
chronous monolithic step-down switching regulator that n
<3µA IQ Regulating 12VIN to 3.3VOUT
consumes only 1.7µA of non-switching quiescent current. n
Output Ripple <10mV
The LT8607 can deliver 750mA of continuous current.
P-P High Efficiency 2MHz Synchronous Operation:
Low ripple Burst Mode operation enables high efficiency n
>93% Efficiency at 0.5A, 12V
down to very low output currents while keeping the output
IN to 5VOUT 750mA Maximum Continuous Output
ripple below 10mVP-P. Internal compensation with peak
Fast Minimum Switch-On Time: 35ns
current mode topology allows the use of small inductors
Adjustable and Synchronizable: 200kHz to 2.2MHz
and results in fast transient response and good loop sta-
Spread Spectrum Frequency Modulation for Low EMI
bility. The EN/UV pin has an accurate 1V threshold and Allows Use of Small Inductors can be used to program VIN undervoltage lockout or to Low Dropout shut down the LT8607 reducing the input supply current Peak Current Mode Operation to 1µA. The PG pin signals when VOUT is within ±8.5% of Accurate 1V Enable Pin Threshold the programmed output voltage as well as fault conditions. Internal Compensation The MSOP package includes a SYNC pin to synchronize Output Soft-Start and Tracking to an external clock, or to select Burst Mode operation Small Thermally Enhanced 10-Lead MSOP Package or or pulse-skipping with or without spread spectrum; the 8-Lead 2mm × 2mm DFN Package TR/SS pin programs soft-start or tracking. The DFN pack- age omits these pins and can be purchased in pulse-skip-
APPLICATIONS
ping or Burst Mode operation. General Purpose Step-Down Converter
PACKAGE SYNC FUNCTIONALITY
Low EMI Step Down LT8607MSE MSE Programmable LT8607DFN DFN Burst Mode Operation LT8607BDFN DFN Pulse-Skipping Mode All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION 12VIN to 5VOUT Efficiency 5V, 2MHz Step-Down
100 95 VIN VIN BST 5.7V to 42V 90 EN/UV 0.1µF 4.7µF VOUT 85 SYNC SW 5V 4.7µH 750mA 80 LT8607 100k 75 INTV POWER CC PG GOOD 70 EFFICIENCY (%) 1µF TR/SS 65 FB 10pF 60 10nF RT 22µF L = 4.7µH 55 18.2k GND 187k X7R f 1M SW = 2MHz 1206 50 0 125 250 375 500 625 750 fSW = 2MHz I 8607 TA01a OUT (mA) 8607 TA01b Rev. C Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts