Datasheet LT1614 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | Inverting 600kHz Switching Regulator |
| Páginas / Página | 16 / 1 — FEATURES. DESCRIPTIO. Better Regulation Than a Charge Pump. 0.1. … |
| Formato / tamaño de archivo | PDF / 273 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTIO. Better Regulation Than a Charge Pump. 0.1. Effective Output Impedance. – 5V at 200mA from a 5V Input
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LT1614 Inverting 600kHz Switching Regulator
U FEATURES DESCRIPTIO
■
Better Regulation Than a Charge Pump
The LT®1614 is a fixed frequency, inverting mode switch- ■
0.1
Ω
Effective Output Impedance
ing reglator that operates from an input voltage as low as ■
– 5V at 200mA from a 5V Input
1V. Utilizing a low noise topology, the LT1614 can gener- ■ 600kHz Fixed Frequency Operation ate a negative output down to – 24V from a 1V to 5V input. ■ Operates with V Fixed frequency switching ensures a clean output free IN as Low as 1V ■ 1mA Quiescent Current from low frequency noise. The device contains a low- ■ Low Shutdown Current: 10µA battery detector with a 200mV reference and shuts down ■ Low-Battery Detector to less than 10µA. No load quiescent current of the LT1614 ■ Low V is 1mA and the internal NPN power switch handles a CESAT Switch: 295mV at 500mA 500mA current with a voltage drop of just 295mV.
U APPLICATIO S
High frequency switching enables the use of small induc- tors and capacitors. Ceramic capacitors can be used in ■ MR Head Bias many applications, eliminating the need for bulky tanta- ■ LCD Bias lum types. ■ GaAs FET Bias ■ Positive-to-Negative Conversion The LT1614 is available in 8-lead MSOP or SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATIO
C3 L1 L2 1µF
5V to – 5V Converter Efficiency
22µH 22µH VIN 90 5V V V IN SW OUT – 5V + 80 SHDN C1 69.8k 200mA LT1614 33µF C2 V D1 C NFB + 33µF 70 GND 24.9k 100k 1nF 60 EFFICIENCY (%) C1, C2: AVX TAJB336M010 1614 TA01 50 C3: TAIYO YUDEN EMK316BJ105MF D1: MBR0520 L1, L2: MURATA LQH3C220 40 3 10 30 100 300
Figure 1. 5V to – 5V/200mA Converter
LOAD CURRENT (mA) 1614 TA02 1
U FEATURES DESCRIPTIO
■
Better Regulation Than a Charge Pump
The LT®1614 is a fixed frequency, inverting mode switch- ■
0.1
Ω
Effective Output Impedance
ing reglator that operates from an input voltage as low as ■
– 5V at 200mA from a 5V Input
1V. Utilizing a low noise topology, the LT1614 can gener- ■ 600kHz Fixed Frequency Operation ate a negative output down to – 24V from a 1V to 5V input. ■ Operates with V Fixed frequency switching ensures a clean output free IN as Low as 1V ■ 1mA Quiescent Current from low frequency noise. The device contains a low- ■ Low Shutdown Current: 10µA battery detector with a 200mV reference and shuts down ■ Low-Battery Detector to less than 10µA. No load quiescent current of the LT1614 ■ Low V is 1mA and the internal NPN power switch handles a CESAT Switch: 295mV at 500mA 500mA current with a voltage drop of just 295mV.
U APPLICATIO S
High frequency switching enables the use of small induc- tors and capacitors. Ceramic capacitors can be used in ■ MR Head Bias many applications, eliminating the need for bulky tanta- ■ LCD Bias lum types. ■ GaAs FET Bias ■ Positive-to-Negative Conversion The LT1614 is available in 8-lead MSOP or SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATIO
C3 L1 L2 1µF
5V to – 5V Converter Efficiency
22µH 22µH VIN 90 5V V V IN SW OUT – 5V + 80 SHDN C1 69.8k 200mA LT1614 33µF C2 V D1 C NFB + 33µF 70 GND 24.9k 100k 1nF 60 EFFICIENCY (%) C1, C2: AVX TAJB336M010 1614 TA01 50 C3: TAIYO YUDEN EMK316BJ105MF D1: MBR0520 L1, L2: MURATA LQH3C220 40 3 10 30 100 300
Figure 1. 5V to – 5V/200mA Converter
LOAD CURRENT (mA) 1614 TA02 1