Datasheet LTC3626 (Analog Devices)

LTC3626 20V, 2.5A Synchronous Monolithic Step-Down Regulator with Current and Temperature Monitoring
FeaTures DescripTion
n
3.6V to 20V Input Voltage Range
The LTC®3626 is a high efficiency, monolithic synchronous n
Wide Output Voltage Range of 0.6V to 97% VIN Opti-
buck regulator using a phase-lockable controlled on-time,
mized for 0.6V to 6V
current mode architecture capable of supplying up to 2.5A n
Low RDS(ON) Integrated Switches Provide Up to 95%
of output current. The operating supply voltage range is
Efficiency
3.6V to 20V, making it suitable for a wide range of power n
Up to 2.5A of Output Current
supply applications. n
Average Input and Output Current Monitoring
The operating frequency is programmable from 500kHz to n
Programmable Average Input/Output Current Limit
3MHz with an external resistor allowing the use of small n
Die Temperature Monitor and Programmable Limit
surface mount inductors. For applications sensitive to n
Adjustable Switching Frequency: 500kHz to 3MHz
switching noise, the LTC3626 can be externally synchro- n
External Frequency Synchronization
nized over the same frequency range. An internal phase- n
Current Mode Operation for Excellent Line and Load
locked loop aligns the on-time of the top power MOSFET to
Transient Response
the internal or external clock. This unique controlled on-time n
0.6V Reference with 1% Accuracy Over Temperature
architecture is ideal for high step-down ratio applications n User Selectable Burst Mode® Operation or Forced that demand high switching frequencies and fast transient Continuous Operation response. An internal phase lock loop servos the on-time n Short-Circuit Protected of the internal one-shot timer to match the frequency of n Output Voltage Tracking Capability the internal clock or an applied external clock. n Power Good Status Output n Available in Small, Thermally Enhanced, 20-Lead The LTC3626 offers two operational modes: Burst (3mm × 4mm) QFN Package Mode and forced continuous mode to allow the user to optimize output voltage ripple, noise and light load
applicaTions
efficiency for a given application. n Distributed Power Systems L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property n Battery-Powered Instruments of their respective owners. Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611, 5994885. n Point-of-Load Power Supply
Typical applicaTion Efficiency vs Load Current
100 VOUT = 3.3V VIN PV 90 IN 3.6V TO 20V SVIN 47µF 80 10 RUN BOOST LTC3626 0.1µF 70 POWER LOSS (W) PGOOD 60 1 INTVCC 2.2µH VOUT TRACK/SS SW 3.3V 2.2µF 50 ITH 115k 47µF 2.5A MODE/SYNC V 40 0.1 ON TSET 22pF EFFICIENCY (%) 30 IMONIN FB Burst Mode TMON RT 20 0.01 OPERATION IMON 25.5k OUT 10 VIN = 12V 1µF 5.1k SGND PGND 324k 3626 TA01 VIN = 5V 0 0.001 1 10 100 1000 10000 LOAD CURRENT (mA) 3626 TA01b 3626fa For more information www.linear.com/LTC3626 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts