Datasheet LT3464 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | Micropower Boost Converter with Integrated Schottky and Output Disconnect in ThinSOT |
| 页数 / 页 | 16 / 1 — FEATURES. DESCRIPTIO. Tiny Solution Size. Low Quiescent Current. • 25. A … |
| 文件格式/大小 | PDF / 255 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTIO. Tiny Solution Size. Low Quiescent Current. • 25. A in Active Mode. • 0.5. A in Shutdown Mode
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LT3464 Micropower Boost Converter with Schottky and Output Disconnect in ThinSOT™
U FEATURES DESCRIPTIO
■
Tiny Solution Size
The LT®3464 is a micropower step-up DC/DC converter ■
Low Quiescent Current
with integrated Schottky diode and output disconnect
• 25
µ
A in Active Mode
packaged in an 8-lead low profile (1mm) SOT-23. The
• 0.5
µ
A in Shutdown Mode
small package size, high level of integration, and the use ■
Internal 115mA, 36V Switch
of tiny SMT components yield a solution size of less than ■
Integrated Schottky Diode
40mm2. The LT3464 has a typical current limit of 115mA ■
Integrated PNP Output Disconnect with
as well as fast switching speed to allow the use of a chip
Short-Circuit Protection
inductor and small ceramic capacitors. The internal PNP ■
Internal Reference Override Pin
disconnects the output load from the input during shut- ■ 16V at 8mA from 3.6V Input down, and also provides output short-circuit protection. ■ 12V at 20mA from 5V Input An auxiliary reference input allows the user to override the ■ Input Range: 2.3V to 10V internal 1.25V feedback reference with any lower value, ■ High Output Voltage: Up to 34V allowing full control of the output voltage during opera- ■ Low Profile (1mm) SOT-23 Package tion. This device features a low 25 µA quiescent current,
U
which is further reduced to less than 0.5µA in shutdown.
APPLICATIO S
A current limited fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad ■ OEL Panel Bias range of operating current. The rugged 36V switch and ■ LCD Bias output disconnect circuitry allow outputs up to 34V to be ■ Handheld Computers easily generated in a simple boost topology. ■ Battery Backup , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Digital Cameras ThinSOT is a trademark of Linear Technolgy Corporation ■ Cellular Phones
U TYPICAL APPLICATIO Efficiency
22µH VIN 90 2.3V TO 10V VIN = 8.4V 80 VIN SW V V IN = 4.2V OUT OUT 16V 70 CTRL 0.22µF 1µF LT3464 CAP 60 SHDN 0.33µF 3.48M EFFICIENCY (%) 50 FB GND 294k 40 3464 TA01a 300.01 0.1 1 10 100 LOAD CURRENT (mA) 3464 TA01b 3464f 1
U FEATURES DESCRIPTIO
■
Tiny Solution Size
The LT®3464 is a micropower step-up DC/DC converter ■
Low Quiescent Current
with integrated Schottky diode and output disconnect
• 25
µ
A in Active Mode
packaged in an 8-lead low profile (1mm) SOT-23. The
• 0.5
µ
A in Shutdown Mode
small package size, high level of integration, and the use ■
Internal 115mA, 36V Switch
of tiny SMT components yield a solution size of less than ■
Integrated Schottky Diode
40mm2. The LT3464 has a typical current limit of 115mA ■
Integrated PNP Output Disconnect with
as well as fast switching speed to allow the use of a chip
Short-Circuit Protection
inductor and small ceramic capacitors. The internal PNP ■
Internal Reference Override Pin
disconnects the output load from the input during shut- ■ 16V at 8mA from 3.6V Input down, and also provides output short-circuit protection. ■ 12V at 20mA from 5V Input An auxiliary reference input allows the user to override the ■ Input Range: 2.3V to 10V internal 1.25V feedback reference with any lower value, ■ High Output Voltage: Up to 34V allowing full control of the output voltage during opera- ■ Low Profile (1mm) SOT-23 Package tion. This device features a low 25 µA quiescent current,
U
which is further reduced to less than 0.5µA in shutdown.
APPLICATIO S
A current limited fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad ■ OEL Panel Bias range of operating current. The rugged 36V switch and ■ LCD Bias output disconnect circuitry allow outputs up to 34V to be ■ Handheld Computers easily generated in a simple boost topology. ■ Battery Backup , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Digital Cameras ThinSOT is a trademark of Linear Technolgy Corporation ■ Cellular Phones
U TYPICAL APPLICATIO Efficiency
22µH VIN 90 2.3V TO 10V VIN = 8.4V 80 VIN SW V V IN = 4.2V OUT OUT 16V 70 CTRL 0.22µF 1µF LT3464 CAP 60 SHDN 0.33µF 3.48M EFFICIENCY (%) 50 FB GND 294k 40 3464 TA01a 300.01 0.1 1 10 100 LOAD CURRENT (mA) 3464 TA01b 3464f 1