Datasheet LTC7878 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 70V Parallelable 4-Switch Buck-Boost Controller with Inductor DCR Current Sensing |
| Páginas / Página | 30 / 1 — FEATURES. DESCRIPTION. Single Inductor Architecture Allows VIN Above,. … |
| Formato / tamaño de archivo | PDF / 2.4 Mb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Single Inductor Architecture Allows VIN Above,. Below or Equal to the Regulated VOUT
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LTC7878 70V Parallelable 4-Switch Buck-Boost Controller with Inductor DCR Current Sensing
FEATURES DESCRIPTION
n
Single Inductor Architecture Allows VIN Above,
The LTC®7878 is a high performance buck-boost switch-
Below or Equal to the Regulated VOUT
ing regulator controller that operates from an input volt- n
Synchronous Rectification: Up to 98% Efficiency
age above, below or equal to the output voltage. The con- n
Wide VIN Voltage Range: 5V to 70V
stant-frequency, peak current mode architecture allows n
±1% Output Voltage Accuracy: 1V ≤ VOUT ≤ 70V
a phase-lockable switching frequency of up to 600kHz, n
DCR or RSENSE Current Sensing
while a programmable input or output current loop regu- n
Peak Current Mode Control in Buck/Boost/Buck-
lates the average input or output current accurately sup-
Boost Mode
porting battery charging applications. With a wide 5V to n
Programmable Input or Output Current Regulation
70V input and output range and seamless, low noise tran- n 7V NMOS Gate Drivers sitions between operating regions, the LTC7878 is ideal n Phase-Lockable Frequency (100kHz to 600kHz) for industrial and telecom systems. n Multiphase/Multi-ICs Parallel Operation n Selectable Continuous or Pulse-Skipping Mode The LTC7878 features forced continuous mode (FCM)/ Operation and Inductor Peak Current Limits pulse-skipping mode operation. It supports multiphase/ n Small 32-Lead 5mm × 5mm QFN Package multi-ICs parallel operation for high power applications. n 48-Lead 7mm x 7mm x 0.75mm LFCSP Package Additional features include 7V N-Channel gate drivers, smart EXTVCC auxiliary supply and programmable induc- tor peak current limit. A PGOOD pin indicates when the
APPLICATIONS
output is within 10% of its designed set point. n Industrial and Telecom Systems n The LTC7878 is available in both a low-profile, 32-lead Distributed DC Power or Battery Systems n QFN and a 48-lead LFCSP packages. Battery Backup Units (BBU)
TYPICAL APPLICATION
L V M1 4.7µH M4 V IN OUT 9V TO 36V 12V, 6A C CC R IN C 22µF 47nF 10k C C BST1 BST2 COUT1 COUT2
Input Voltage Line Transient
0.1µF 0.1µF 220µF 220µF
9VIN to 15VIN to 9VIN
SW1 ISNSD ISNSP ISNSN SW2 BOOST1 BOOST1 BOOST2 BOOST2 VIN M3 M2 BG1 BG2 10V/DIV TG1 TG2 SW1 VIN V 10V/DIV OUT R1 SS EXTVCC VOUT(AC) C 110k SS LTC7878 V 500mV/DIV 0.022µF FB R2 FREQ CSP 10k IL 100k CSN 2A/DIV MODE/ILIM D INTV BST1 CC 1ms/DIV 7878 TA01b CINTVCC BOOST1 ITHB 4.7µF DBST2 ITH DRVCC BOOST2 8k CDRVCC SGND PGND 15nF 4.7µF 7878 TA01a Rev. C Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n
Single Inductor Architecture Allows VIN Above,
The LTC®7878 is a high performance buck-boost switch-
Below or Equal to the Regulated VOUT
ing regulator controller that operates from an input volt- n
Synchronous Rectification: Up to 98% Efficiency
age above, below or equal to the output voltage. The con- n
Wide VIN Voltage Range: 5V to 70V
stant-frequency, peak current mode architecture allows n
±1% Output Voltage Accuracy: 1V ≤ VOUT ≤ 70V
a phase-lockable switching frequency of up to 600kHz, n
DCR or RSENSE Current Sensing
while a programmable input or output current loop regu- n
Peak Current Mode Control in Buck/Boost/Buck-
lates the average input or output current accurately sup-
Boost Mode
porting battery charging applications. With a wide 5V to n
Programmable Input or Output Current Regulation
70V input and output range and seamless, low noise tran- n 7V NMOS Gate Drivers sitions between operating regions, the LTC7878 is ideal n Phase-Lockable Frequency (100kHz to 600kHz) for industrial and telecom systems. n Multiphase/Multi-ICs Parallel Operation n Selectable Continuous or Pulse-Skipping Mode The LTC7878 features forced continuous mode (FCM)/ Operation and Inductor Peak Current Limits pulse-skipping mode operation. It supports multiphase/ n Small 32-Lead 5mm × 5mm QFN Package multi-ICs parallel operation for high power applications. n 48-Lead 7mm x 7mm x 0.75mm LFCSP Package Additional features include 7V N-Channel gate drivers, smart EXTVCC auxiliary supply and programmable induc- tor peak current limit. A PGOOD pin indicates when the
APPLICATIONS
output is within 10% of its designed set point. n Industrial and Telecom Systems n The LTC7878 is available in both a low-profile, 32-lead Distributed DC Power or Battery Systems n QFN and a 48-lead LFCSP packages. Battery Backup Units (BBU)
TYPICAL APPLICATION
L V M1 4.7µH M4 V IN OUT 9V TO 36V 12V, 6A C CC R IN C 22µF 47nF 10k C C BST1 BST2 COUT1 COUT2
Input Voltage Line Transient
0.1µF 0.1µF 220µF 220µF
9VIN to 15VIN to 9VIN
SW1 ISNSD ISNSP ISNSN SW2 BOOST1 BOOST1 BOOST2 BOOST2 VIN M3 M2 BG1 BG2 10V/DIV TG1 TG2 SW1 VIN V 10V/DIV OUT R1 SS EXTVCC VOUT(AC) C 110k SS LTC7878 V 500mV/DIV 0.022µF FB R2 FREQ CSP 10k IL 100k CSN 2A/DIV MODE/ILIM D INTV BST1 CC 1ms/DIV 7878 TA01b CINTVCC BOOST1 ITHB 4.7µF DBST2 ITH DRVCC BOOST2 8k CDRVCC SGND PGND 15nF 4.7µF 7878 TA01a Rev. C Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts