LINEAR TECHNOLOGY LTC1702 User's Manual
Summary
This synchronous 2-phase switching regulator controller is designed for high-efficiency power management in dual-output applications requiring stable core and I/O supplies. Optimized for low input voltages, it features two independent controllers operating out-of-phase through a constant-frequency 550kHz PWM design. The accompanying manual details its advanced synchronous buck architecture, which minimizes external components while ensuring exceptional output regulation (as low as 1%). Ideal for systems needing superior efficiency across wide load ranges and integrated fault protection logic.
Page 1 Text Content
LTC1702
Dual 550k Hz Synchronous
2-Phase Switching Regulator Controller
FEATURES DESCRIPTIO
Two Independent Controllers in One Package The LTC®1702 is a dual switching regulator controller opti- Two Sides Run Out-of-Phase to Minimize CIN mized for high efficiency with low input voltages. It includes All N-Channel External MOSFET Architecture two complete, on-chip, independent switching regulator No External Current Sense Resistors controllers each designed to drive a pair of external N-channel Excellent Output Regulation: 1% Total Output MOSFET devices in a voltage mode feedback, synchronous Accuracy buck configuration. The LTC1702 uses a constant-frequency, 550k Hz Switching Frequency Minimizes External true PWM design switching at 550k Hz, minimizing external Component Size component size and cost and maximizing load transient 1A to 25A Output Current per Channel performance. The synchronous buck architecture automati- High Efficiency over Wide Load Current Range cally shifts to discontinuous and then to Burst Mode TM Quiescent Current Drops Below 100µA in Shutdown operation as the output load decreases, ensuring maximum Small 24-Pin Narrow SSOP Package efficiency over a wide range of load currents. The LTC1702 features an onboard reference trimmed to
APPLICATIO S 0.5% and can provide better than 1% regulation at the
converter outputs. Open-drain logic outputs indicate whether
Microprocessor Core and I/O Supplies
either output has risen to within 5% of the final output voltage
Multiple Logic Supply Generator
and an optional latching FAULT mode protects the load if the
Distributed Power Applications
output rises 15% above the intended voltage. Each channel
High Efficiency Power Conversion
can be enabled independently; with both channels disabled, the LTC1702 shuts down and supply current drops below
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. 100µA.
TYPICAL APPLICATIO
Dual Output High Power 3.3V/2.5V Logic Supply
VIN = 5V ±10%
COUT1, COUT2: PANASONIC EEFUE0G181R
CIN: KEMET TS10X337M010AS CIN
D1, D2: MOTOROLA MBR0520LT1 D2 330µF D3, D4: MOTOROLA MBRS320T3 ×3
L1, L2: SUMIDA CEP125-1R0 27k Q1 TO Q8: FAIRCHILD FDS6670A 1µF PVCC IMAX2
BOOST1 BOOST2
Q2Q1 BG1 BG2 Q5 Q6
1µH TG1 TG2 1µH
VOUT1
VOUT2
2.5V SW1 SW2
AT 15A 27k
COUT1 IMAX1 PGND 1µF LTC1702
×4 PGOOD1 PGOOD2
FCB FAULT COUT2
RUN/SS RUN/SS2 ×4
COMP1 COMP2
SGND FB2
VIN VIN
FB1 VCC
PWRGD1 PWRGD2 FAULT 1702 TA01
Page Summary Contents For LINEAR TECHNOLOGY LTC1702 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 36 |
| File Size | 357.25 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What is the switching frequency used by the LTC1702 regulator?
It uses a constant-frequency, accuracy PWM design that switches at 550kHz.
How does the device protect the load from overvoltage conditions?
An optional latching FAULT mode protects the load if the output voltage rises 15% above the intended value.
What is the quiescent current draw when the regulator is shut down?
When both channels are independently disabled, the supply current drops below 100mA and the unit shuts down.
What level of regulation accuracy can be achieved at the converter outputs?
The onboard reference allows the LTC1702 to provide better than 1% regulation at the converter outputs.