LTC1436ACGN

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
Packaging: Tube
Boost: No
Flyback: No
Manufacturer: Linear Technology
Duty Cycle: 99%
Package / Case: 24-SSOP (0.154", 3.90mm Width)
Frequency - Max: 138kHz
Voltage - Supply: 3.5 V ~ 30 V


Features:

Maintains Constant Frequency at Low Output Currents
Dual N-Channel MOSFET Synchronous Drive
Programmable Fixed Frequency (PLL Lockable)
Wide VINRange: 3.5V to 36V OperationLow Minimum On-Time (300ns) for High Frequency, Low DutyCycle Applications
Very Low Dropout Operation: 99% Duty Cycle
Low Dropout, 0.5A Linear Regulator for CPU I/O or Low Noise Audio Supplies
Built-In Power-On Reset Timer
Programmable Soft Start
Low-Battery Detector
Remote Output Voltage Sense
Foldback Current Limiting (Optional)
Pin Selectable Output Voltage
Logic Controlled Micropower Shutdown: IQ < 25µA
Output Voltages from 1.19V to 9V
Available in 24-Lead Narrow SSOP and 28-Lead SSOP Packages


Application

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


Specifications

Input Supply Voltage (V_IN).............................36V to 0.3V
Topside Driver Supply Voltage (Boost)...........42V to 0.3V
Switch Voltage (SW)...................................V_IN+ 5V to 5V
EXTV_CCVoltage...............................................10V to 0.3V
POR, LBO Voltages.........................................12V to 0.3V
AUXFB Voltage................................................20V to 0.3V
AUXDR Voltage................................................28V to 0.3V
SENSE+, SENSE,V_OSENSEV_oltage...INTV_CC+ 0.3V to 0.3V
V_PROGVoltage.............................................INTV_CCto 0.3V
AUXON, PLLIN, SFB,
RUN/SS, LBI Voltages.................................10V to 0.3V
Peak Driver Output Current < 10µs (TGL, BG).................2A
Peak Driver Output Current < 10µs (TGS)................250mA
INTV_CCOutput Current.................................................50mA
Operating Temperature Range
LTC143XAC...............................................0°C to 70°C
LTC143XAI.......................................... 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®1436A/LTC1437A are synchronous step-downswitching regulator controllers that drive externalN-channel power MOSFETs in a phase lockable, fixedfrequency architecture. The Adaptive PowerTMoutput stageselectively drives two N-channel MOSFETs at frequenciesup to 400kHz while reducing switching losses to maintainhigh efficiencies at low output currents.

An auxiliary 0.5A linear regulator of LTC1436A/LTC1437A  is using an external PNPpass device provides a low noise, low dropout voltage source. A secondary winding feedback control pin (SFB)guarantees regulation regardless of the load on the main
output by forcing continuous operation.

An additional comparator of LTC1436A/LTC1437A  is available for use as a low-battery detector. A power-on reset timer (POR) is included which generates a signal delayed by 65536/fCLK(300mstypically) after the output is within 5% of the regulated
output voltage. Internal resistive dividers provide pinselectable output voltages with remote sense capability.

The operating current level  of LTC1436A/LTC1437A is user-programmable via anexternal current sense resistor.  Wide input supply range allows operation from 3.5V to 30V (36V maximum).

Parameters:

Technical/Catalog Information	LTC1436ACGN
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	3.5 ~ 30 V
Voltage - Output	1.19 ~ 9 V
Current - Output	50mA
Power - Output	-
Package / Case	24-SSOP
Packaging	Tube
Internal Switch(s)	No
Synchronous	Yes
Rds (On)	-
Operating Temperature	0°C ~ 70°C
Frequency - Switching	125kHz ~ 240kHz
Drawing Number	161; 05-08-1641; GN; 16
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LTC1436ACGN LTC1436ACGN