Datasheet LT3483, LT3483A (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | Inverting Micropower DC/DC Converters with Schottky |
| Páginas / Página | 12 / 1 — FEATURES. DESCRIPTION. Internal 40V Schottky Diode. One Resistor Feedback … |
| Formato / tamaño de archivo | PDF / 937 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Internal 40V Schottky Diode. One Resistor Feedback (Other Resistor Inside)
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Versión de texto del documento
LT3483/LT3483A Inverting Micropower DC/DC Converters with Schottky
FEATURES DESCRIPTION
n
Internal 40V Schottky Diode
The LT®3483/LT3483A are micropower inverting DC/DC n
One Resistor Feedback (Other Resistor Inside)
converters with integrated Schottky and one resistor n
Internal 40V, 200mA/400mA Power Switch
feedback. The small package size, high level of integration n
Generates Regulated Negative Outputs to –38V
and use of tiny surface mount components yield a solution n Low Quiescent Current: size as small as 40mm2. The devices feature a quiescent 40µA in Active Mode current of only 40µA at no load, which further reduces <1µA in Shutdown Mode to 0.1µA in shutdown. A current limited, fixed off-time n Low VCESAT Switch: 200mV at 150mA control scheme conserves operating current, resulting n Wide Input Range: 2.5V to 16V in high efficiency over a broad range of load current. A n Uses Small Surface Mount Components precisely trimmed 10µA feedback current enables one n Output Short-Circuit Protected resistor feedback and virtually eliminates feedback load- n Available in a 6-Lead SOT-23 (LT3483 Only) and ing of the output. The 40V switch enables voltage outputs Low Profile 8-Lead DFN (2mm × 2mm × 0.75mm) up to –38V to be generated without the use of costly Packages transformers. The LT3483/LT3483A’s low 300ns off-time permits the use of tiny low profile inductors and capaci-
APPLICATIONS
tors to minimize footprint and cost in space-conscious portable applications. n LCD Bias L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Handheld Computers ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7710700. n Battery Backup n Digital Cameras n OLED Bias
TYPICAL APPLICATION 3.6V to –8V DC/DC Converter Efficiency and Power Loss
75 1000 0.22µF V 10µH IN = 3.6V VIN 3.6V 10Ω EFFICIENCY 70 100 POWER LOSS (mW) SW V V OUT IN D –8V LT3483 25mA 4.7µF 5pF 806k 65 10 SHDN FB 2.2µF POWER GND EFFICIENCY (%) LOSS 60 1 3483 TA01a 55 0.1 0.1 1 10 100 LOAD CURRENT (mA) 3483 TA01b 3483fc 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration 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
n
Internal 40V Schottky Diode
The LT®3483/LT3483A are micropower inverting DC/DC n
One Resistor Feedback (Other Resistor Inside)
converters with integrated Schottky and one resistor n
Internal 40V, 200mA/400mA Power Switch
feedback. The small package size, high level of integration n
Generates Regulated Negative Outputs to –38V
and use of tiny surface mount components yield a solution n Low Quiescent Current: size as small as 40mm2. The devices feature a quiescent 40µA in Active Mode current of only 40µA at no load, which further reduces <1µA in Shutdown Mode to 0.1µA in shutdown. A current limited, fixed off-time n Low VCESAT Switch: 200mV at 150mA control scheme conserves operating current, resulting n Wide Input Range: 2.5V to 16V in high efficiency over a broad range of load current. A n Uses Small Surface Mount Components precisely trimmed 10µA feedback current enables one n Output Short-Circuit Protected resistor feedback and virtually eliminates feedback load- n Available in a 6-Lead SOT-23 (LT3483 Only) and ing of the output. The 40V switch enables voltage outputs Low Profile 8-Lead DFN (2mm × 2mm × 0.75mm) up to –38V to be generated without the use of costly Packages transformers. The LT3483/LT3483A’s low 300ns off-time permits the use of tiny low profile inductors and capaci-
APPLICATIONS
tors to minimize footprint and cost in space-conscious portable applications. n LCD Bias L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Handheld Computers ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7710700. n Battery Backup n Digital Cameras n OLED Bias
TYPICAL APPLICATION 3.6V to –8V DC/DC Converter Efficiency and Power Loss
75 1000 0.22µF V 10µH IN = 3.6V VIN 3.6V 10Ω EFFICIENCY 70 100 POWER LOSS (mW) SW V V OUT IN D –8V LT3483 25mA 4.7µF 5pF 806k 65 10 SHDN FB 2.2µF POWER GND EFFICIENCY (%) LOSS 60 1 3483 TA01a 55 0.1 0.1 1 10 100 LOAD CURRENT (mA) 3483 TA01b 3483fc 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics Typical Performance Characteristics pin functions block diagram operation applications information typical applications Package Description Revision History Typical Application Related Parts