Features and Benefits
- 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
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||5 × 5 QFN-32|
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Tools & Simulations
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Models for the following parts are available in LTspice:
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Design tools for the following parts are available in LTpowerCAD:
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