Datasheet Linear Technology LT1613 (Linear Technology)
| 制造商 | Linear Technology |
| 描述 | 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23 |
| 页数 / 页 | 12 / 1 — FEATURES. DESCRIPTIO. Uses Tiny Capacitors and Inductor. Internally … |
| 修订版 | S |
| 文件格式/大小 | PDF / 302 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTIO. Uses Tiny Capacitors and Inductor. Internally Compensated. Fixed Frequency 1.4MHz Operation
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LT1613 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23
U FEATURES DESCRIPTIO
■
Uses Tiny Capacitors and Inductor
The LT®1613 is the industry’s first 5-lead SOT-23 current ■
Internally Compensated
mode DC/DC converter. Intended for small, low power ■
Fixed Frequency 1.4MHz Operation
applications, it operates from an input voltage as low as ■ Operates with VIN as Low as 1.1V 1.1V and switches at 1.4MHz, allowing the use of tiny, low ■ 3V at 30mA from a Single Cell cost capacitors and inductors 2mm or less in height. Its ■ 5V at 200mA from 3.3V Input small size and high switching frequency enables the ■ 15V at 60mA from Four Alkaline Cells complete DC/DC converter function to take up less than ■
High Output Voltage: Up to 34V
0.2 square inches of PC board area. Multiple output power ■ Low Shutdown Current: <1µA supplies can now use a separate regulator for each output ■ Low VCESAT Switch: 300mV at 300mA voltage, replacing cumbersome quasi-regulated ap- ■ Tiny 5-Lead SOT-23 Package proaches using a single regulator and a custom trans- former.
U
A constant frequency, internally compensated current
APPLICATIO S
mode PWM architecture results in low, predictable output ■ Digital Cameras noise that is easy to filter. The high voltage switch on the ■ Pagers LT1613 is rated at 36V, making the device ideal for boost ■ Cordless Phones converters up to 34V as well as for Single-Ended Primary ■ Battery Backup Inductance Converter (SEPIC) and flyback designs. The ■ LCD Bias device can generate 5V at up to 200mA from a 3.3V supply ■ Medical Diagnostic Equipment or 5V at 175mA from four alkaline cells in a SEPIC design. ■ Local 5V or 12V Supply The LT1613 is available in the 5-lead SOT-23 package. ■ External Modems ■ PC Cards , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATIO
L1
Efficiency Curve
4.7µH D1 V V 100 IN OUT 3.3V 5V 95 200mA V R1 IN SW 90 37.4k VIN = 4.2V + + C1 C2 85 LT1613 15µF 22µF 80 V SHDN SHDN FB IN = 3.5V 75 GND R2 VIN = 2.8V 70 12.1k EFFICIENCY (%) 65 V L1: MURATA LQH3C4R7M24 OR SUMIDA CD43-4R7 IN = 1.5V 60 C1: AVX TAJA156M010 C2: AVX TAJB226M006 1613 TA01 55 D1: MBR0520 50 0 50 100 150 200 250 300 350 400
Figure 1. 3.3V to 5V 200mA DC/DC Converter
LOAD CURRENT (mA) 1613 TA01a 1
U FEATURES DESCRIPTIO
■
Uses Tiny Capacitors and Inductor
The LT®1613 is the industry’s first 5-lead SOT-23 current ■
Internally Compensated
mode DC/DC converter. Intended for small, low power ■
Fixed Frequency 1.4MHz Operation
applications, it operates from an input voltage as low as ■ Operates with VIN as Low as 1.1V 1.1V and switches at 1.4MHz, allowing the use of tiny, low ■ 3V at 30mA from a Single Cell cost capacitors and inductors 2mm or less in height. Its ■ 5V at 200mA from 3.3V Input small size and high switching frequency enables the ■ 15V at 60mA from Four Alkaline Cells complete DC/DC converter function to take up less than ■
High Output Voltage: Up to 34V
0.2 square inches of PC board area. Multiple output power ■ Low Shutdown Current: <1µA supplies can now use a separate regulator for each output ■ Low VCESAT Switch: 300mV at 300mA voltage, replacing cumbersome quasi-regulated ap- ■ Tiny 5-Lead SOT-23 Package proaches using a single regulator and a custom trans- former.
U
A constant frequency, internally compensated current
APPLICATIO S
mode PWM architecture results in low, predictable output ■ Digital Cameras noise that is easy to filter. The high voltage switch on the ■ Pagers LT1613 is rated at 36V, making the device ideal for boost ■ Cordless Phones converters up to 34V as well as for Single-Ended Primary ■ Battery Backup Inductance Converter (SEPIC) and flyback designs. The ■ LCD Bias device can generate 5V at up to 200mA from a 3.3V supply ■ Medical Diagnostic Equipment or 5V at 175mA from four alkaline cells in a SEPIC design. ■ Local 5V or 12V Supply The LT1613 is available in the 5-lead SOT-23 package. ■ External Modems ■ PC Cards , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATIO
L1
Efficiency Curve
4.7µH D1 V V 100 IN OUT 3.3V 5V 95 200mA V R1 IN SW 90 37.4k VIN = 4.2V + + C1 C2 85 LT1613 15µF 22µF 80 V SHDN SHDN FB IN = 3.5V 75 GND R2 VIN = 2.8V 70 12.1k EFFICIENCY (%) 65 V L1: MURATA LQH3C4R7M24 OR SUMIDA CD43-4R7 IN = 1.5V 60 C1: AVX TAJA156M010 C2: AVX TAJB226M006 1613 TA01 55 D1: MBR0520 50 0 50 100 150 200 250 300 350 400
Figure 1. 3.3V to 5V 200mA DC/DC Converter
LOAD CURRENT (mA) 1613 TA01a 1