LTC1624IS8

Series: -
Buck: Yes
Boost: Yes
Flyback: Yes
Doubler: No
Divider: No
Cuk: No
Isolated: No
PWM Type: Current Mode
Number of Outputs: 1
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Operating Temperature: -40°C ~ 85°C
Inverting: Yes
Packaging: Tube
Duty Cycle: 95%
Manufacturer: Linear Technology
Frequency - Max: 225kHz
Voltage - Supply: 3.5 V ~ 36 V


Features:

N-Channel MOSFET Drive
Implements Boost, Step-Down, SEPIC and Inverting Regulators
Wide V_IN  Range: 3.5V to 36V Operation
Wide _VOUT Range: 1.19V to 30V in Step-Down Configuration
±1% 1.19V Reference
Low Dropout Operation: 95% Duty Cycle
200kHz Fixed Frequency
Low Standby Current
Very High Efficiency
Remote Output Voltage Sense
Logic-Controlled Micropower Shutdown
Internal Diode for Bootstrapped Gate Drive
Current Mode Operation for Excellent Line and Load Transient Response
Available in an 8-Lead SO Package


Application

Notebook and Palmtop Computers, PDAs
Cellular Telephones and Wireless Modems
Battery-Operated Digital Devices
DC Power Distribution Systems
Battery Chargers


Pinout




Specifications

Input Supply Voltage (V_IN)........................36V to -0.3V
Topside Driver Supply Voltage (BOOST)....42V to -0.3V
Switch Voltage (SW).................................36V to -0.6V
Differential Boost Voltage
    (BOOST to SW)....................................7.8V to -0.3V
SENSE - Voltage
    V_IN < 15V.................................(V_IN + 0.3V) to -0.3V
    V_IN15V............................(V_IN  +0.3V) to (V_IN -15V)
I_TH/RUN, V_FB Voltages............................ 2.7V to -0.3V
Peak Driver Output Current < 10s (TG)..................2A
Operating Temperature Range
       LTC1624CS..........................................0 to 70
       LTC1624IS........................................-40 to 85
Junction Temperature (Note 1)...........................125
Storage Temperature Range.................-60 to 150
Lead Temperature (Soldering, 10 sec)................300


Description

      The LTC^® 1624 is a current mode switching regulator controller that  drives an external N-channel power MOSFET using a fixed frequency architecture. It can be operated inall standard switching configurations including boost, step-down, inverting and SEPIC. Burst ModeTM operation provides high efficiency at low load currents. A maximum high duty cycle limit of 95% provides low dropout operation which extends operating time in battery-operated systems.

      The operating frequency of LTC1624 is internally set to 200kHz, allowing small inductor values and minimizing PC board space. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 36V (absolute maximum).

     A multifunction pin (ITH /RUN) allows external compensation for optimum load step response plus shutdown. Soft start  can also be implemented with the ITH /RUN pin  to properly sequence supplies.

Parameters:

Technical/Catalog Information	LTC1624IS8
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck), Step-Up (Boost), Inverting, Sepic
Number of Outputs	1
Voltage - Input	3.5 ~ 36 V
Voltage - Output	1.19 ~ 30 V
Current - Output	2A
Power - Output	-
Package / Case	8-SOIC (3.9mm Width)
Packaging	Bulk
Internal Switch(s)	No
Synchronous	No
Rds (On)	-
Operating Temperature	-40°C ~ 85°C
Frequency - Switching	200kHz
Drawing Number	161; 05-08-1610; S, S8; 8, 14, 16
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LTC1624IS8 LTC1624IS8