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LTC1438

Features: · Maintains Constant Frequency at Low Output Currents· Dual N-Channel MOSFET Synchronous Drive· Programmable Fixed Frequency (PLL Lockable)· Wide VIN Range: 3.5V to 36V Operation· Ultrahigh Efficiency· Very Low Dropout Operation: 99% Duty Cycle· Low Dropout, 0.5A Linear Regulator for VPP...

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SeekIC No. : 004401589 Detail

LTC1438: Features: · Maintains Constant Frequency at Low Output Currents· Dual N-Channel MOSFET Synchronous Drive· Programmable Fixed Frequency (PLL Lockable)· Wide VIN Range: 3.5V to 36V Operation· Ultrahig...

LTC1438 Data Sheet

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Part Number:
LTC1438
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

· Maintains Constant Frequency at Low Output Currents
· Dual N-Channel MOSFET Synchronous Drive
· Programmable Fixed Frequency (PLL Lockable)
· Wide VIN Range: 3.5V to 36V Operation
· Ultrahigh Efficiency
· Very Low Dropout Operation: 99% Duty Cycle
· Low Dropout, 0.5A Linear Regulator for VPP Generation or Low Noise Audio Supply
·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 < 30mA
· Output Voltages from 1.19V to 9V
· Available in 28- and 36-Lead SSOP Packages


Application

· Notebook and Palmtop Computers, PDAs
· Portable Instruments
· Battery-Operated Devices
· DC Power Distribution Systems


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN)......................... 36V to 0.3V
Topside Driver Voltage (BOOST 1, 2) ......... 42V to 0.3V
Switch Voltage (SW1, 2)....................... VIN + 5V to 5V
EXTVCC Voltage......................................... 10V to 0.3V
POR2, LBO Voltages .................................. 12V to 0.3V
AUXFB Voltage .......................................... 20V to 0.3V
AUXDR Voltage.......................................... 28V to 0.3V
SENSE+ 1, SENSE+ 2, SENSE 1, SENSE 2,
VOSENSE2 Voltages ................ INTVCC + 0.3V to 0.3V
VPROG1, VPROG2 Voltages ................ INTVCC to 0.3V
PLL LPF, ITH1, ITH2 Voltages .................. 2.7V to 0.3V
AUXON, PLLIN, SFB1,
RUN/SS1, RUN/SS2, LBI Voltages ............. 10V to 0.3V
Peak Output Current < 10ms (TGL1, 2, BG1, 2)......... 2A
Peak Output Current < 10ms (TGS1, 2) .............. 250mA
INTVCC Output Current ........................................ 50mA
Operating Ambient Temperature Range
Commercial .............................................. 0°C to 70°C
Industrial ............................................ 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®1438/LTC1439 are dual, synchronous stepdown switching regulator controllers which drive external N-channel power MOSFETs in a phase-lockable fixed frequency architecture. The Adaptive PowerTM output stage selectively drives two N-channel MOSFETs at frequencies up to 400kHz while reducing switching losses to maintain high efficiencies at low output currents.

An auxiliary 0.5A linear regulator using an external PNP pass device provides a low noise, low dropout voltage source. A secondary winding feedback control pin (SFB1) guarantees regulation regardless of load on the main output by forcing continuous operation.

An additional comparator of LTC1438/LTC1439  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 (typ 300ms) after the output is within 5% of the regulated output voltage. Internal resistive dividers provide pin selectable output voltages with remote sense capability on one of the two outputs.

The operating current levels of LTC1438/LTC1439  are user-programmable via external current sense resistors. Wide input supply range allows operation from 3.5V to 30V (36V maximum).




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