LTC3788-1 - 2-Phase, Dual Output Synchronous Boost Controller

Features

  • Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation
  • Wide Input Range: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up
  • Output Voltages Up to 60V
  • ±1% 1.2V Reference Voltage
  • RSENSE or Inductor DCR Current Sensing
  • 100% Duty Cycle Capability for Synchronous MOSFET
  • Low Quiescent Current: 125μA
  • Phase-Lockable Frequency (75kHz to 850kHz)
  • Programmable Fixed Frequency (50kHz to 900kHz)
  • Adjustable Output Voltage Soft-Start
  • Power Good Output Voltage Monitor
  • Low Shutdown Current IQ: <8μA
  • Internal LDO Powers Gate Drive from VBIAS or EXTVCC
  • Available in a Narrow SSOP Package

Typical Application

LTC3788-1 Typical Application
LTC3788-1 Typical Application

Description

The LTC3788-1 is a high performance 2-phase dual synchronous boost converter controller that drives all N-channel power MOSFETs. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements, allowing the LTC3788-1 to be used in high power boost applications.

A constant-frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3788-1 features a precision 1.2V reference and a power good output indicator. A 4.5V to 38V input supply range encompasses a wide range of system architectures and battery chemistries.

Independent SS pins for each controller ramp the output voltages during start-up. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode or continuous inductor current mode at light loads.

For a leadless 32-pin QFN package with additional features of adjustable current limit, clock out, phase modulation and two PGOOD outputs, see the LTC3788 data sheet.

  CLKOUT/PHASMD
Adjustable Current Sense Power Good Package
LTC3788 Yes Yes 2 5x5 QFN-32
LTC3788-1 No No 1 SSOP-28

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC3788EGN-1#PBF SSOP-28 GN E 05-08-1641 (GN28) Yes
LTC3788EGN-1#TRPBF SSOP-28 GN E 05-08-1641 (GN28) Yes
LTC3788IGN-1#PBF SSOP-28 GN I 05-08-1641 (GN28) Yes
LTC3788IGN-1#TRPBF SSOP-28 GN I 05-08-1641 (GN28) Yes


LTC3788-1 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3788EGN-1#PBF SSOP-28 E $5.04 $3.53 Yes
LTC3788EGN-1#TRPBF SSOP-28 E $3.59 Yes
LTC3788IGN-1#PBF SSOP-28 I $5.71 $4.00 Yes
LTC3788IGN-1#TRPBF SSOP-28 I $4.06 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • Industrial
  • Automotive
  • Medical
  • Military

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LTC3788
LTC3788-1

LTpowerCAD

The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LTC3788
LTC3788 Parallel

Technical Support