Position: Home  > All Categories> Integrated Circuits (ICs) > LTC1538

LTC1538

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 Genera...

product image

LTC1538 Picture
See larger image
SeekIC No. : 004401662 Detail

LTC1538: 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 Eff...

LTC1538 Data Sheet

floor Price/Ceiling Price

Get Latest Price
Part Number:
LTC1538
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

SeekIC Buyer Protection PLUS - newly updated for 2013!

  • Escrow Protection.
  • Guaranteed refunds.
  • Secure payments.
  • Learn more >>

Month Sales

268 Transactions

Rating

evaluate  (4.8 stars)

Upload time: 2025/1/10

add to my favourite

Payment Methods

All payment methods are secure and covered by SeekIC Buyer Protection PLUS.

Notice: When you place an order, your payment is made to SeekIC and not to your seller. SeekIC only pays the seller after confirming you have received your order. We will also never share your payment details with your seller.
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
`5V Standby Regulator Active in Shutdown: IQ < 200A
`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
Peak Switch Voltage > 10ms (SW 1, 2) ... VIN + 5V to 5V
EXTVCC Voltage.................................... ........ 10V to 0.3V
POR1, 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 < 10 s (TGL1, 2, BG1, 2) ............ 2A
Peak Output Current < 10 s (TGS1, 2) ................. 250mA
INTVCC Output Current ............................................. 50mA
Operating Temperature Range
LTC1538-AUXCG/LTC1539CGW.................... O°C to 70°C
LTC1538-AUXIG/LTC1539IGW ................. 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®1538-AUX/LTC1539 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 of LTC1538-AUX/LTC1539  is 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.

A 5V/20mA regulator, internal 1.19V reference and an uncommitted comparator remain active when both controllers are shut down. A power-on reset timer (POR) is included which generates a signal delayed by 65536/fCLK (typ 300ms) after the controller's output is within 5% of the regulated first voltage. Internal resistive dividers provide pin selectable output voltages with remote sense capability on one of the two outputs.

The operating current levels of LTC1538-AUX/LTC1539  are user-programmable via external current sense resistors. Wide input supply range allows operation from 3.5V to 30V (36V maximum).




Customers Who Bought This Item Also Bought

Margin,quality,low-cost products with low minimum orders. Secure your online payments with SeekIC Buyer Protection.
You may also be interested in :
Isolators
HCPL062N
HCPL316J
Prototyping Products
AVT4168
DE1
Boxes, Enclosures, Racks
ACLSN12
ACLJIC
Potentiometers, Variable Resistors
RV24YN
WXD4-23-3W
Crystals and Oscillators
WT325BI0030.000000
2SB49
Memory Cards, Modules
WT32
VTL5C7
View more