Datasheet LTC3785-1 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 10V, High Efficiency, Buck-Boost Controller with Power Good |
| Páginas / Página | 20 / 1 — FEATURES. DESCRIPTION. Single Inductor Architecture Allows VIN Above,. … |
| Formato / tamaño de archivo | PDF / 224 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Single Inductor Architecture Allows VIN Above,. Below or Equal to VOUT. Power Good Output Indicator
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LTC3785-1 10V, High Effi ciency, Buck-Boost Controller with Power Good
FEATURES DESCRIPTION
n
Single Inductor Architecture Allows VIN Above,
The LTC®3785-1 is a high power synchronous buck-boost
Below or Equal to VOUT
controller that drives all N-channel power MOSFETs from n
Power Good Output Indicator
input voltages above, below and equal to the output volt- n
2.7V to 10V Input and Output Range
age. With an input range of 2.7V to 10V, the LTC3785-1 is n
Up to 96% Effi ciency
well suited for a wide variety of single or dual cell Li-Ion n
Up to 10A of Output Current
or multicell alkaline/NiMH applications. n
All N-channel MOSFETs, No RSENSE™
The operating frequency can be programmed from 100kHz n True Output Disconnect During Shutdown to 1MHz. The soft-start time and current limit are also n Programmable Current Limit and Soft-Start programmable. The soft-start capacitor doubles as the n Optional Short-Circuit Shutdown Timer fault timer which can program the IC to latch off or recycle n Output Overvoltage and Undervoltage Protection after a determined off time. Burst Mode operation is user n Programmable Frequency: 100kHz to 1MHz controlled and can be enabled by driving the mode pin n Selectable Burst Mode® Operation high. The LTC3785-1 includes a power good output that n Available in 24-Lead (4mm × 4mm) Exposed Pad indicates when the output voltage is within 7.5% of its QFN Package designed setpoint. Protection features include foldback current limit,
APPLICATIONS
short-circuit and overvoltage protection. n Palmtop Computers L n , LT, LTC ,LTM and Burst Mode are registered trademarks of Linear Technology Corporation. Handheld Instruments No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the n Wireless Modems property of their respective owners. n Cellular Telephones
TYPICAL APPLICATION
VIN 2.7V V
Effi ciency vs Input Voltage
OUT 4.7μF TO 10V VIN 100 VCC VOUT = 3.3V 215k F I OSC = 500kHz SVIN V TG1 22μF SENSE 1.3k 215k 127k A 95 V I BST1 270pF LOAD = 2A 0.22μF FB SW1 ILOAD = 1A ISSW1 127k 12k VDRV EFFICIENCY (%) 90 BG1 4.7μH 1nF LTC3785-1 V B C VOUT RT ISVOUT 3.3V 5A 85 49.9k 2.5 4 5.5 7 8.5 10 MODE TG2 VIN (V) D 37851 TA01b PGOOD VBST2 0.22μF RUN/SS SW2 I I LSET SSW2 100μF CCM BG2 2.2nF 42.2k GND C 37851 TA01a 37851fa 1
FEATURES DESCRIPTION
n
Single Inductor Architecture Allows VIN Above,
The LTC®3785-1 is a high power synchronous buck-boost
Below or Equal to VOUT
controller that drives all N-channel power MOSFETs from n
Power Good Output Indicator
input voltages above, below and equal to the output volt- n
2.7V to 10V Input and Output Range
age. With an input range of 2.7V to 10V, the LTC3785-1 is n
Up to 96% Effi ciency
well suited for a wide variety of single or dual cell Li-Ion n
Up to 10A of Output Current
or multicell alkaline/NiMH applications. n
All N-channel MOSFETs, No RSENSE™
The operating frequency can be programmed from 100kHz n True Output Disconnect During Shutdown to 1MHz. The soft-start time and current limit are also n Programmable Current Limit and Soft-Start programmable. The soft-start capacitor doubles as the n Optional Short-Circuit Shutdown Timer fault timer which can program the IC to latch off or recycle n Output Overvoltage and Undervoltage Protection after a determined off time. Burst Mode operation is user n Programmable Frequency: 100kHz to 1MHz controlled and can be enabled by driving the mode pin n Selectable Burst Mode® Operation high. The LTC3785-1 includes a power good output that n Available in 24-Lead (4mm × 4mm) Exposed Pad indicates when the output voltage is within 7.5% of its QFN Package designed setpoint. Protection features include foldback current limit,
APPLICATIONS
short-circuit and overvoltage protection. n Palmtop Computers L n , LT, LTC ,LTM and Burst Mode are registered trademarks of Linear Technology Corporation. Handheld Instruments No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the n Wireless Modems property of their respective owners. n Cellular Telephones
TYPICAL APPLICATION
VIN 2.7V V
Effi ciency vs Input Voltage
OUT 4.7μF TO 10V VIN 100 VCC VOUT = 3.3V 215k F I OSC = 500kHz SVIN V TG1 22μF SENSE 1.3k 215k 127k A 95 V I BST1 270pF LOAD = 2A 0.22μF FB SW1 ILOAD = 1A ISSW1 127k 12k VDRV EFFICIENCY (%) 90 BG1 4.7μH 1nF LTC3785-1 V B C VOUT RT ISVOUT 3.3V 5A 85 49.9k 2.5 4 5.5 7 8.5 10 MODE TG2 VIN (V) D 37851 TA01b PGOOD VBST2 0.22μF RUN/SS SW2 I I LSET SSW2 100μF CCM BG2 2.2nF 42.2k GND C 37851 TA01a 37851fa 1