Features
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Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation
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Wide Input Range: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up
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Output Voltages Up to 60V
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±1% 1.2V Reference Voltage
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RSENSE or Inductor DCR Current Sensing
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100% Duty Cycle Capability for Synchronous MOSFET
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Low Quiescent Current: 125μA
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Phase-Lockable Frequency (75kHz to 850kHz)
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Programmable Fixed Frequency (50kHz to 900kHz)
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Selectable Current Limit
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Adjustable Output Voltage Soft-Start
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Power Good Output Voltage Monitors
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Low Shutdown Current IQ: <8μA
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Internal LDO Powers Gate Drive from VBIAS or EXTVCC
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Thermally Enhanced Low Profi le 32-Pin 5mm × 5mm QFN Package
Description
The LTC3788 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 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 features a precision 1.2V reference and dual power good output indicators. 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 leaded 28-lead SSOP package with a fixed current limit and one PGOOD output, without phase modulation or a clock output, see the LTC3788-1 data sheet.
Applications
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Industrial
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Automotive
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Medical
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Military
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