23885

·  High Power Switching Regulator Controller for 3.3V-5V to 1.xV-3.xV Step-Down Applications
·  No Current Sense Resistor Required
·  Low Input Supply Voltage Range: 3V to 8V
·  Maximum Duty Cycle > 91% Over Temperature
·  All N-Channel External MOSFETs
·  Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
·  High Efficiency: Over 95% Possible
·  Adjustable or Fixed 3.3V Output (16-Pin Version)
·  Programmable Fixed Frequency Operation: 100kHz to 500kHz
·  External Clock Synchronization
·  Soft-Start (Some Versions)
·  Low Shutdown Current: <10mA
·  Overtemperature Protection
·  Available in S8, S16 and SSOP-16 Packages

·  CPU Power Supplies
·  Multiple Logic Supply Generator
·  Distributed Power Applications
·  High Efficiency Power Conversion

Supply Voltage
V_CC ........................................................................... 9V
PV_CC1,2 ................................................................... 14V
Input Voltage
IFB, IMAX .................................................. 0.3V to 14V
SENSE⁺, SENSE, FB,
SHDN, FREQSET ............................ 0.3V to V_CC + 0.3V
Junction Temperature .......................................... 125
Operating Temperature Range (Note 9) .. 40 to 85
Storage Temperature Range ................. 65 to 150
Lead Temperature (Soldering, 10 sec).................. 300

The LTC®3830/LTC3830-1 are high power, high efficiency switching regulator controllers optimized for 3.3V-5V to 1.xV-3.xV step-down applications. A precision internal reference and feedback system provide ±1% output regulation over temperature, load current and line voltage variations. The LTC3830/LTC3830-1 use a synchronous switching architecture with N-channel MOSFETs. Additionally, the chip senses output current through the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without a current sense resistor.

The LTC3830/LTC3830-1 operate with an input supply voltage as low as 3V and with a maximum duty cycle of >91% over temperature. They include a fixed frequency PWM oscillator for low output ripple operation. The 200kHz free-running clock frequency can be externally adjusted or synchronized with an external signal from 100kHz to 500kHz.

In shutdown mode, the LTC3830 supply current drops to <10mA. The LTC3830-1 differs from the LTC3830 S8 version by replacing shutdown with a soft-start function.