The LT3430/LT3430-1 are monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 3A, 0.1Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and excellent loop stability. Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry* maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 30µA and a SYNC pin can be externally synchronized with a logic level input from 228kHz to 700kHz for the LT3430 or from 125kHz to 250kHz for the LT3430-1. The LT3430/LT3430-1 are available in a thermally enhanced 16-pin TSSOP package.
The LT3430 and LT3430-1 are monolithic buck switching regulators that accept input voltages from 5.5 V up to 60 V and deliver up to 3 A of peak switch current. They operate at a constant switching frequency of 200 kHz (LT3430) or 100 kHz (LT3430-1) and feature a low 0.12 Ω switch resistance, 2.5 mA quiescent supply current, and a 30 pA shutdown current.
The device is supplied in a 16‑lead plastic TSSOP package with an exposed ground pad. It includes pins for bias, boost, sync, shutdown, and feedback, allowing external synchronization (125‑250 kHz for LT3430‑1, 228‑700 kHz for LT3430) and efficient operation over a wide temperature range (-40 °C to 125 °C). The datasheet also details absolute maximum ratings, typical performance curves, and recommended layout guidelines.
| Input Voltage Range | 5.5 V to 60 V |
|---|---|
| Peak Switch Current | 3 A |
| Switch Frequency | 200 kHz (LT3430) / 100 kHz (LT3430-1) |
| Switch Resistance | 0.12 Ω |
| Supply Current | 2.5 mA |
| Shutdown Current | 30 pA |
| Package Type | 16‑Lead Plastic TSSOP |
| Operating Junction Temperature Range | -40 °C to 125 °C |
| Maximum Switch Duty Cycle (LT3430-1) | 96 % |
| SYNC Frequency Range (LT3430-1) | 125 kHz to 250 kHz |
The device operates from 5.5 V up to 60 V input.
It can deliver a peak switch current of 3 A across all duty cycles.
Use the SYNC pin; the LT3430 accepts 228 kHz‑700 kHz and the LT3430‑1 accepts 125 kHz‑250 kHz.
The shutdown current is 30 pA.