Datasheet LTC3832, LTC3832-1 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation |
| Páginas / Página | 24 / 1 — FEATURES. DESCRIPTIO. VOUT as Low as 0.6V. High Power Switching Regulator … |
| Formato / tamaño de archivo | PDF / 329 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTIO. VOUT as Low as 0.6V. High Power Switching Regulator Controller
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LTC3832/LTC3832-1 High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation
U FEATURES DESCRIPTIO
■
VOUT as Low as 0.6V
The LTC®3832/LTC3832-1 are high power, high effi- ■
High Power Switching Regulator Controller
ciency switching regulator controllers optimized for
for 3.3V-5V to 0.6V-3.xV Step-Down Applications
3.3V-5V to 0.6V-3.xV step-down applications. A preci- ■
No Current Sense Resistor Required
sion internal reference and feedback system provide ■
Low Input Supply Voltage Range: 3V to 8V
±1% output regulation over temperature, load current ■
Maximum Duty Cycle > 91% Over Temperature
and line voltage variations. The LTC3832/LTC3832-1 use ■ All N-Channel External MOSFETs a synchronous switching architecture with N-channel ■ Excellent Output Regulation: ±1% Over Line, Load MOSFETs. Additionally, the chip senses output current and Temperature Variations through the drain-source resistance of the upper ■ High Efficiency: Over 95% Possible N-channel MOSFET, providing an adjustable current limit ■ Adjustable or Fixed 2.5V Output (LTC3832) without a current sense resistor. ■ Programmable Fixed Frequency Operation: 100kHz to The LTC3832/LTC3832-1 operate with an input supply 500kHz voltage as low as 3V and with a maximum duty cycle of ■ External Clock Synchronization >91% over temperature. They include a fixed frequency ■ Soft-Start PWM oscillator for low output ripple operation. The 300kHz ■ Low Shutdown Current: <10µA free-running clock frequency can be externally adjusted or ■ Overtemperature Protection synchronized with an external signal from 100kHz to 500kHz. ■ Available in SO-8 and SSOP-16 Packages In shutdown mode, the LTC3832 supply current drops to
U
<10µA. The LTC3832-1 is the SO-8 version without current
APPLICATIO S
limit, frequency adjustment and shutdown functions. ■ CPU Power Supplies , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Multiple Logic Supply Generator ■ Distributed Power Applications ■ High Efficiency Power Conversion
U TYPICAL APPLICATIO
VIN
Efficiency
4.7µF 3V TO 7V 5.1Ω 100 + VOUT = 2.5V 0.1µF MBR0520T1 90 LTC3832-1 SS VCC/PVCC2 0.01µF 80 VOUT = 1V COMP G1 Si9426DY L1 15k 0.1µF 3.2µH V 70 OUT GND PVCC1 1V 9A 6.49k EFFICIENCY (%) 60 FB G2 Si9426DY + COUT 270µF 2V 50 4.32k 3832 F01 VIN = 3.3V 680pF L1: SUMIDA CDEP105-3R2MC-88 40 C 0 1 2 3 4 5 6 7 8 9 10 OUT: PANASONIC EEFUEOD271R LOAD CURRENT (A)
Figure 1. High Efficiency 3.3V to 1V Power Converter
3832 F01b sn3832 3832fs 1
U FEATURES DESCRIPTIO
■
VOUT as Low as 0.6V
The LTC®3832/LTC3832-1 are high power, high effi- ■
High Power Switching Regulator Controller
ciency switching regulator controllers optimized for
for 3.3V-5V to 0.6V-3.xV Step-Down Applications
3.3V-5V to 0.6V-3.xV step-down applications. A preci- ■
No Current Sense Resistor Required
sion internal reference and feedback system provide ■
Low Input Supply Voltage Range: 3V to 8V
±1% output regulation over temperature, load current ■
Maximum Duty Cycle > 91% Over Temperature
and line voltage variations. The LTC3832/LTC3832-1 use ■ All N-Channel External MOSFETs a synchronous switching architecture with N-channel ■ Excellent Output Regulation: ±1% Over Line, Load MOSFETs. Additionally, the chip senses output current and Temperature Variations through the drain-source resistance of the upper ■ High Efficiency: Over 95% Possible N-channel MOSFET, providing an adjustable current limit ■ Adjustable or Fixed 2.5V Output (LTC3832) without a current sense resistor. ■ Programmable Fixed Frequency Operation: 100kHz to The LTC3832/LTC3832-1 operate with an input supply 500kHz voltage as low as 3V and with a maximum duty cycle of ■ External Clock Synchronization >91% over temperature. They include a fixed frequency ■ Soft-Start PWM oscillator for low output ripple operation. The 300kHz ■ Low Shutdown Current: <10µA free-running clock frequency can be externally adjusted or ■ Overtemperature Protection synchronized with an external signal from 100kHz to 500kHz. ■ Available in SO-8 and SSOP-16 Packages In shutdown mode, the LTC3832 supply current drops to
U
<10µA. The LTC3832-1 is the SO-8 version without current
APPLICATIO S
limit, frequency adjustment and shutdown functions. ■ CPU Power Supplies , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Multiple Logic Supply Generator ■ Distributed Power Applications ■ High Efficiency Power Conversion
U TYPICAL APPLICATIO
VIN
Efficiency
4.7µF 3V TO 7V 5.1Ω 100 + VOUT = 2.5V 0.1µF MBR0520T1 90 LTC3832-1 SS VCC/PVCC2 0.01µF 80 VOUT = 1V COMP G1 Si9426DY L1 15k 0.1µF 3.2µH V 70 OUT GND PVCC1 1V 9A 6.49k EFFICIENCY (%) 60 FB G2 Si9426DY + COUT 270µF 2V 50 4.32k 3832 F01 VIN = 3.3V 680pF L1: SUMIDA CDEP105-3R2MC-88 40 C 0 1 2 3 4 5 6 7 8 9 10 OUT: PANASONIC EEFUEOD271R LOAD CURRENT (A)
Figure 1. High Efficiency 3.3V to 1V Power Converter
3832 F01b sn3832 3832fs 1