LT3093EMSE Pinout & Specs — Datasheet Summary for LDO

Negative Linear Regulator
200mA Output
Ultra-Low Noise

The LT3093EMSE is a high-performance negative low‑dropout linear regulator optimized for precision analog systems.

Core Utility: This device supports an output range down to −19.5 V with a 200 mA maximum current capability. Its ultra‑low dropout of approximately 190 mV at rated load makes it indispensable for compact, programmable negative supplies such as sensor front-ends and op‑amp rails.

Quick Overview & Key Specifications

Application Context

Designed for precision negative rails, the LT3093EMSE features programmable control pins including PG/PGFB, VIOC, ILIM, and EN/UVLO. This combination is ideal for analog subsystems requiring adjustable current limits, power-good signaling, and controlled startup.

Package Details

The device is housed in a 12-pin MSOP with an exposed thermal pad. Effective thermal management via PCB copper area and via stitching is critical for maintaining performance at the 200 mA rating.

Performance Visualization

Output Voltage Range (Up to -19.5V)
100% Range

Output Current (Max 200mA)
High Capacity

Dropout Voltage (~190mV)
Ultra-Low Dropout

Pinout Analysis & Signal Functions

1. IN
Input negative rail. Primary supply entry point.

2. EN/UVLO
Enable or Undervoltage Lockout.

3. PG / 4. PGFB
Power-Good output and feedback monitoring.

5. ILIM
Current-limit program pin via resistor.

6. VIOC
Output clamp and offset control adjustment.

7. SET / 8. GND
Program node and ground reference.

9-11. OUT / EP
Output pins and Exposed Pad (Thermal Ground).

Electrical Characteristics Highlights

Parameter	Typical / Max (Datasheet Specs)
Output Range	To −19.5 V (configured via SET resistor)
Maximum Output Current	200 mA
Dropout Voltage (Typical)	~190 mV at rated load
Quiescent Current	Refer to datasheet for specific VIN/VOUT conditions

PCB Layout & Thermal Best Practices

• Solder the exposed pad to a large copper plane with multiple thermal vias for heat dissipation.
• Place input (1–10 μF) and output (4.7–22 μF) capacitors immediately adjacent to the pins.
• Use star grounding for sensitive nodes (SET, VIOC) to prevent noise injection.

Common Troubleshooting

PG Stuck Low? Check PG pull‑up resistors and PGFB wiring.

Incorrect VOUT? Verify the SET resistor value and ensure VIOC connections are secure.

Thermal Shutdown? Increase copper area or derate current below 200 mA for sustained operation.

Common Questions (FAQ)

What is the LT3093EMSE pinout diagram for the 12‑pin MSOP?
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The functional pin mapping includes IN, EN/UVLO, PG/PGFB, ILIM, VIOC, SET, GND, and multiple OUT pins. For the 12‑pin MSOP, the exposed pad (EP) serves as the primary thermal reference and must be soldered to the PCB ground plane.

How do you set VIOC on the LT3093EMSE?
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VIOC adjusts the output clamp/offset and is configured using a resistor network as described in the manufacturer’s datasheet. Use the provided formulas to calculate specific values based on your desired clamp behavior and validate the response under load.

What PCB layout tips ensure thermal reliability?
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Key reliability factors include soldering the exposed pad to a large copper plane with multiple thermal vias, placing input/output capacitors extremely close to their respective pins, and ensuring at least several cm² of copper area to sustain 200 mA operation without triggering thermal shutdown.