Datasheet LTC3610 (Analog Devices)

LTC3610 24V, 12A Monolithic Synchronous Step-Down DC/DC Converter Features Description ■
12A Output Current
The LTC®3610 is a high efficiency, monolithic synchronous ■
Wide VIN Range = 4V to 24V
step-down DC/DC converter that can deliver up to 12A ■
Internal N-Channel MOSFETs
output current from a 4V to 24V (28V maximum) input ■
True Current Mode Control
supply. It uses a valley current control architecture to de- ■
Optimized for High Step-Down Ratios
liver very low duty cycle operation at high frequency with ■
tON(MIN) ≤100ns
excellent transient response. The operating frequency is ■
Extremely Fast Transient Response
selected by an external resistor and is compensated for ■
Stable with Ceramic COUT
variations in VIN and VOUT. ■
±1% 0.6V Voltage Reference
The LTC3610 can be configured for discontinuous or ■ Power Good Output Voltage Monitor forced continuous operation at light load. Forced continu- ■ Adjustable On-Time/Switching Frequency ous operation reduces noise and RF interference while ■ Adjustable Current Limit discontinuous mode provides high efficiency by reducing ■ Programmable Soft-Start switching losses at light loads. ■ Output Overvoltage Protection ■ Optional Short-Circuit Shutdown Timer Fault protection is provided by internal foldback current ■ Low Shutdown I limiting, an output overvoltage comparator and an optional Q: 15µA ■ Available in a 9mm × 9mm 64-Pin QFN Package short-circuit shutdown timer. Soft-start capability for sup- ply sequencing is accomplished using an external timing applications capacitor. The regulator current limit is user programmable. A power good output voltage monitor indicates when ■ Point of Load Regulation the output is in regulation. The LTC3610 is available in a ■ Distributed Power Systems compact 9mm × 9mm QFN package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6100678, 6580258, 5847554, 6304066. typical application
High Efficiency Step-Down Converter
604k
Efficiency vs Load Current
0.1µF VON ION 100 10000 VIN RUN/SS VIN 4V TO 24V 95 V 10µF IN = 5V 100pF LTC3610 ×3 90 0.47µH 1000 V POWER LOSS (mW) OUT 85 VIN = 12V SW 2.5V 470pF 12A 0.22µF 80 100µF ITH BOOST ×2 75 100 31.83k 70 SGND INTV EFFICIENCY (%) CC 30.1k 65 POWER LOSS 12V FCB 10 60 POWER LOSS 5V V 4.7µF RNG 55 PGND V PGOOD OUT = 2.5V 50 1 EXTV 0.01 0.1 1 10 CC VFB LOAD CURRENT (A) 3610 TA01a 9.5k 3610 TA01b 3610ff Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts