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
• R_SENSE 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)
• Selectable Current Limit
• Adjustable Output Voltage Soft-Start
• Power Good Output Voltage Monitors
• Low Shutdown Current I_Q: <8μA
• Internal LDO Powers Gate Drive from VBIAS or EXTV_CC
• Thermally Enhanced Low Profi le 32-Pin 5mm × 5mm QFN Package

Typical Application

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.