LTC1159CG-3.3

Series: -
Buck: Yes
Inverting: No
Doubler: No
Divider: No
Cuk: No
Isolated: No
Operating Temperature: 0°C ~ 70°C
PWM Type: Current Mode
Number of Outputs: 1
Duty Cycle: 100%
Packaging: Tube
Boost: No
Flyback: No
Package / Case: 20-SSOP (0.209", 5.30mm Width)
Manufacturer: Linear Technology
Frequency - Max: 250kHz
Voltage - Supply: 4 V ~ 40 V


Features:

· Operation from 4V to 40V Input Voltage
· Ultra-High Efficiency: Up to 95%
· 20mA Supply Current in Shutdown
· High Efficiency Maintained Over Wide Current Range
· Current Mode Operation for Excellent Line and Load  Transient Response
·Very Low Dropout Operation: 100% Duty Cycle
·Short-Circuit Protection
· Synchronous FET Switching for High Efficiency
·Adaptive Non-Overlap Gate Drives
·Available in SSOP and SO Packages


Application

· Step-Down and Inverting Regulators
· Notebook and Palmtop Computers
· Portable Instruments
· Battery-Operated Digital Devices
· Industrial Power Distribution
· Avionics Systems
· Telecom Power Supplies


Pinout




Specifications

Input Supply Voltage (Pin 2)...................... 15V to 60V
VCC Output Current (Pin 3) ................................... 50mA
Continuous Pin Currents (Any Pin) ......................... 50mA
Sense Voltages ......................................... 0.3V to 13V
Shutdown Voltages...................................................... 7V
EXTVCC Input Voltage ............................................... 15V
Operating Temperature Range .................. 0°C to 70°C
Extended Commercial
Temperature Range ............................. 40°C to 85°C
Junction Temperature (Note 1) ............................. 125°C
Storage Temperature Range .............. 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C


Description

The LTC®1159 series is a family of synchronous step-down switching regulator controllers featuring automatic Burst ModeTM operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture.

A separate pin and on-board switch of LTC1159 series  allow the MOSFET driver power to be derived from the regulated output voltage providing significant efficiency improvement when operating at high input voltages. The constant off-time current-mode architecture maintains constant ripple current in the inductor and provides excellent line and load transient response. The output current level is user programmable via an external current sense resistor.

The LTC1159 automatically switches to power saving Burst Mode operation when load current drops below approximately 15% of maximum current. Standby current is only 300mA while still regulating the output and shutdown current is a low 20A.

Parameters:

Technical/Catalog Information	LTC1159CG-3.3
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	4 ~ 40 V
Voltage - Output	12V
Current - Output	50mA
Power - Output	-
Package / Case	20-SSOP
Packaging	Tube
Internal Switch(s)	No
Synchronous	Yes
Rds (On)	-
Operating Temperature	0°C ~ 70°C
Frequency - Switching	250kHz
Drawing Number	161; 05-08-1640; G; 16
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LTC1159CG 3 3 LTC1159CG33