LTC3788 Series

2-Phase, Dual Output Synchronous Boost Controller

Catalog

2-Phase, Dual Output Synchronous Boost Controller

Part	Clock Sync	Synchronous Rectifier	Output Phases	Function	Operating Temperature [Min]	Operating Temperature [Max]	Number of Outputs	Output Configuration	Mounting Type	Frequency - Switching [Max]	Frequency - Switching [Min]	Control Features	Topology	Supplier Device Package	Duty Cycle (Max) [Max]	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Output Type
Analog Devices LTC3788EUH#PBF			2	Step-Up	-40 °C	125 ¯C	2	Positive	Surface Mount	760 kHz	105 kHz	Current Limit Enable Frequency Control Power Good Soft Start	Boost	32-QFN (5x5)	96 %	38 V	4.5 V	Transistor Driver

Catalog

2-Phase, Dual Output Synchronous Boost Controller

Key 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

• RSENSEor 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 IQ: <8μA

• Internal LDO Powers Gate Drive from VBIAS or EXTVCC

• Thermally Enhanced Low Profile 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.CLKOUT/PHASMDAdjustable Current SensePower GoodPackageLTC3788YesYes25 × 5 QFN-32LTC3788-1NoNo1SSOP-28ApplicationsIndustrialAutomotiveMedicalMilitary