LTC3858-1
Analog Devices
- Darmowa próbka
- Kod:
- LTC3858-1
- Producent:
- ANALOG DEVICES
- Dodany do bazy:
- Ostatnio widziany:
Sugerowane produkty dla ltc38581
Low I, Dual 2-Phase Synchronous Step-Down Controller
* Low Operating IQ: 170μA (One Channel On)
* Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
* Wide VIN Range: 4V to 38V
* RSENSE or DCR Current Sensing
* Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
* OPTI-LOOP® Compensation Minimizes COUT
* Phase-Lockable Frequency (75kHz-850kHz)
* Programmable Fixed Frequency (50kHz-900kHz)
* Selectable Continuous, Pulse-Skipping or Burst Mode® Operation at Light Loads
* Very Low Dropout Operation: 99% Duty Cycle
* Adjustable Output Voltage Soft-Start
* Power Good Output Voltage Monitor
* Output Overvoltage Protection
* Output Latch-Off Protection During Short Circuit
* Low Shutdown IQ: 8μA
* Internal LDO Powers Gate Drive from VIN or EXTVCC
* No Current Foldback During Start-Up
* Tiny 4mm × 5mm QFN and Narrow SSOP Packages
The LTC3858-1 is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. Power loss and noise due to the input capacitor ESR are minimized by operating the two controller outputs out of phase. The 170μA no-load quiescent current extends operating life in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3858-1 features a precision 0.8V reference and a power good output indicator. A wide 4V to 38V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. Independent soft-start pins for each controller ramp the output voltages during start-up. The output latch-off feature protects the circuit in short-circuit conditions. For a leadless 32-pin QFN package with the additional features of adjustable current limit, clock out, phase modulation and two PGOOD outputs, see the LTC3858 data sheet.
LTC3858
LTC3858-1
LTC3858-2
Features
Adjustable Current Limit, Clock Output, Phase Modulation, 2 PGOOD Outputs
Fixed Current Limit, One PGOOD Output
Overvoltage protection crowbar and short-circuit latchoff disabled
Package
QFN-32
SSOP-28
QFN-32
Applications
* Automotive Systems
* Battery Operated Digital Devices
* Distributed DC Power Systems
Elecena nie prowadzi sprzedaży elementów elektronicznych, ani w niej nie pośredniczy.
Produkt pochodzi z oferty sklepu Analog Devices