Datasheet LT1616 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 600mA, 1.4MHz Step-Down Switching Regulator in SOT-23 |
| Páginas / Página | 16 / 1 — FEATURES. DESCRIPTIO. Wide Input Range: 3.6V to 25V. APPLICATIO S. … |
| Formato / tamaño de archivo | PDF / 288 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTIO. Wide Input Range: 3.6V to 25V. APPLICATIO S. TYPICAL APPLICATIO. 3.3V Step-Down Converter. Efficiency
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LT1616 600mA, 1.4MHz Step-Down Switching Regulator in SOT-23
U FEATURES DESCRIPTIO
■
Wide Input Range: 3.6V to 25V
The LT®1616 is a current mode PWM step-down DC/DC ■ 5V at 400mA from 7V to 25V Input converter with internal 0.6A power switch, packaged in a ■ 3.3V at 400mA from 4.7V to 25V Input tiny 6-lead SOT-23. The wide input range of 3.6V to 25V ■ Fixed Frequency 1.4MHz Operation makes the LT1616 suitable for regulating a wide variety of ■ Uses Tiny Capacitors and Inductors power sources, from 4-cell batteries and 5V logic rails to ■ Internally Compensated unregulated wall transformers and lead-acid batteries. Its ■ Low Shutdown Current: <1µA high operating frequency allows the use of tiny, low cost ■ Low VCESAT Switch: 220mV at 300mA inductors and ceramic capacitors. With its internal com- ■ Tiny 6-Lead SOT-23 Package pensation eliminating additional components, a complete 400mA step-down regulator fits onto 0.15 square inches
U
of PC board area.
APPLICATIO S
The constant frequency current mode PWM architecture ■ Wall Transformer Regulation and stable operation with ceramic capacitors results in ■ Local Logic Supply Conversion: low, predictable output ripple. Current limiting provides 12V to 5V protection against shorted outputs. The low current (<1µA) 12V or 5V to 3.3V, 2.5V or 1.8V shutdown provides complete output disconnect, enabling ■ Distributed Supply Regulation easy power management in battery-powered systems. ■ Digital Cameras , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Battery-Powered Equipment
U TYPICAL APPLICATIO 3.3V Step-Down Converter Efficiency
D2 100 5 V 1 IN VIN BOOST 4.5V TO 25V C3 90 L1 V V LT1616 IN = 5V IN = 12V 0.01µF 10µH 4 6 VOUT OFF ON SHDN SW 80 3.3V 300mA: V GND FB IN = 4.5V TO 25V R1 D1 400mA: V VIN = 20V IN = 4.7V TO 25V 70 2 3 16.5k 60 C1 R2 C2 1µF EFFICIENCY (%) 10k 10µF 50 C1: TAIYO-YUDEN TMK316BJ105 1616 TA01 C2: TAIYO-YUDEN JMK316BJ106ML 40 D1: ON SEMICONDUCTOR MBR0530 D2: 1N4148 30 L1: SUMIDA CR43-100 0 100 200 300 400 500 LOAD CURRENT (mA) 1616 G02 1
U FEATURES DESCRIPTIO
■
Wide Input Range: 3.6V to 25V
The LT®1616 is a current mode PWM step-down DC/DC ■ 5V at 400mA from 7V to 25V Input converter with internal 0.6A power switch, packaged in a ■ 3.3V at 400mA from 4.7V to 25V Input tiny 6-lead SOT-23. The wide input range of 3.6V to 25V ■ Fixed Frequency 1.4MHz Operation makes the LT1616 suitable for regulating a wide variety of ■ Uses Tiny Capacitors and Inductors power sources, from 4-cell batteries and 5V logic rails to ■ Internally Compensated unregulated wall transformers and lead-acid batteries. Its ■ Low Shutdown Current: <1µA high operating frequency allows the use of tiny, low cost ■ Low VCESAT Switch: 220mV at 300mA inductors and ceramic capacitors. With its internal com- ■ Tiny 6-Lead SOT-23 Package pensation eliminating additional components, a complete 400mA step-down regulator fits onto 0.15 square inches
U
of PC board area.
APPLICATIO S
The constant frequency current mode PWM architecture ■ Wall Transformer Regulation and stable operation with ceramic capacitors results in ■ Local Logic Supply Conversion: low, predictable output ripple. Current limiting provides 12V to 5V protection against shorted outputs. The low current (<1µA) 12V or 5V to 3.3V, 2.5V or 1.8V shutdown provides complete output disconnect, enabling ■ Distributed Supply Regulation easy power management in battery-powered systems. ■ Digital Cameras , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Battery-Powered Equipment
U TYPICAL APPLICATIO 3.3V Step-Down Converter Efficiency
D2 100 5 V 1 IN VIN BOOST 4.5V TO 25V C3 90 L1 V V LT1616 IN = 5V IN = 12V 0.01µF 10µH 4 6 VOUT OFF ON SHDN SW 80 3.3V 300mA: V GND FB IN = 4.5V TO 25V R1 D1 400mA: V VIN = 20V IN = 4.7V TO 25V 70 2 3 16.5k 60 C1 R2 C2 1µF EFFICIENCY (%) 10k 10µF 50 C1: TAIYO-YUDEN TMK316BJ105 1616 TA01 C2: TAIYO-YUDEN JMK316BJ106ML 40 D1: ON SEMICONDUCTOR MBR0530 D2: 1N4148 30 L1: SUMIDA CR43-100 0 100 200 300 400 500 LOAD CURRENT (mA) 1616 G02 1