LINEAR LTC3827-1 Data Sheet
Summary
The LTC3827-1 is a high-performance, dual two-phase synchronous step-down controller designed for advanced power management in battery and distributed DC systems. This comprehensive manual guides engineers through its implementation, detailing features like wide input voltage support (4V–36V), ultra-low quiescent current (80µA), and optimal efficiency across various load conditions. Ideal for designing complex digital devices or industrial electronics requiring stable, dual-rail power output with advanced protection features.
Page 1 Text Content
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POW ER LOSS (m
LTC3827-1
Low IQ, Dual, 2-Phase Synchronous Controller
FEATURES DESCRIPTIO
Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V The LTC®3827-1 is a high performance dual step-down Low Operating IQ: 80µA (One Channel On) switching regulator controller that drives all N-channel Out-of-Phase Controllers Reduce Required Input synchronous power MOSFET stages. A constant fre- Capacitance and Power Supply Induced Noise quency current mode architecture allows a phase-lock- OPTI-LOOP® Compensation Minimizes COUT able frequency of up to 650k Hz. Power loss and noise due ±1% Output Voltage Accuracy to the ESR of the input capacitor ESR are minimized by Wide VIN Range: 4V to 36V Operation operating the two controller output stages out of phase.
Phase-Lockable Fixed Frequency 140k Hz to 650k Hz
The 80µA no-load quiescent current extends operating life
Selectable Continuous, Pulse Skipping or Low Ripple
in battery powered systems. OPTI-LOOP compensation
Burst Mode® Operation at Light Loads
allows the transient response to be optimized over a wide
Dual N-Channel MOSFET Synchronous Drive
range of output capacitance and ESR values. The
Very Low Dropout Operation: 99% Duty Cycle LTC3827-1 features a precision 0.8V reference and a Adjustable Output Voltage Soft-Start or Tracking power good output indicator. A wide 4V to 36V input Output Current Foldback Limiting supply range encompasses all battery chemistries. Power Good Output Voltage Monitor
Independent TRACK/SS pins for each controller ramp the
Output Overvoltage Protection
output voltage during startup. Current foldback limits
Low Shutdown IQ: 8µA
MOSFET heat dissipation during short-circuit conditions.
Internal LDO Powers Gate Drive from VIN or VOUT
Small 28-Lead SSOP Package The PLLIN/MODE pin selects among Burst Mode opera-
EF FI CI EN CY
tion, pulse skipping mode, or continuous inductor current
APPLICATIO S mode at light loads. For a leadless package version
(5mm x 5mm QFN) with additional features, see the
Automotive Systems
LTC3827 datasheet.
Battery-Operated Digital Devices
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode
Distributed DC Power Systems and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5929620, 6177787, 6144194, 6100678, 5408150, 6580258, 6304066, 5705919.
TYPICAL APPLICATIO
High Efficiency Dual 8.5V/3.3V Step-Down Converter Efficiency and Power Loss vs Load Current
VIN 4V TO 36V 22µF
VIN INTVCC EFFICIENCY
TG1 TG2 VIN = 12V; VOUT = 3.3V
BOOST1 BOOST2
SW1 SW2
BG1 BG2
LTC3827-1
SENSE1+ SENSE2+ POWER LOSS
SENSE1– SENSE2–
VOUT1 VOUT2
3.3V VFB1 VFB2 8.5V
ITH1 ITH2
TRACK/SS1 SGND TRACK/SS2 LOAD CURRENT (m A)
15k 15k 38271 TA01b
FIGURE 13 CIRCUIT
38271 TA01
Page Summary Contents For LINEAR LTC3827-1 Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 32 |
| File Size | 520.41 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
What is the operating temperature range?
The LTC3827-1 operates in a temperature range of –40°C to 85°C.
Does it have low current consumption or complex modes?
It features an ultra-low quiescent current (8µA shutdown, 80µA no-load) and supports Burst Mode, Pulse Skipping, or Continuous operation for efficiency in battery systems.
What voltage range can the input supply handle?
The device accepts a wide input supply voltage ranging from 4V to 36V.
How is output voltage accuracy achieved?
Output voltage accuracy is maintained by operating the two controller output stages out of phase (OPTI-LOOP compensation).