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LM2577SX-ADJ
Public Made by Adomby adom
Texas Instruments DC-DC Converters, TO-263-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownLM2577SX-ADJ
Texas Instruments · DC-DC Converters · TO-263-5
LM2577SX-ADJ from Texas Instruments, in a TO-263-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | COMP | passive | Error amplifier output (compensation) pin where the RC/CC network connects; CC of at least 0.22 µF is required for soft start. |
| 2 | FEEDBACK | input | Error amplifier input that senses the output divider and is compared against the 1.230V internal reference (VOUT = 1.23V(1 + R1/R2)). |
| 3 | GND | power_in | Ground pin, also connected to the package tab. |
| 4 | SWITCH | output | Collector of the internal NPN output switch, rated 3.0A operating current and 0V to 60V operating switch voltage. |
| 5 | VIN | power_in | Input supply pin with operating range 3.5V to 40V (45V absolute maximum), to be bypassed to ground with a 0.1 µF capacitor. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-263-5 |
| Category | Power Management ICs |
| Pins | 6 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Output Voltage | VOUT | 11.6 | 12 | 12.4 | V | VIN = 5V to 10V, ILOAD = 100 mA to 800 mA (Figure 31 circuit) | 7 |
| Line Regulation | ΔVOUT/ΔVIN | 20 | 50 | mV | VIN = 3.5V to 10V, ILOAD = 300 mA | 7 | |
| Load Regulation | ΔVOUT/ΔILOAD | 20 | 50 | mV | VIN = 5V, ILOAD = 100 mA to 800 mA | 7 | |
| Efficiency | η | 80 | % | VIN = 5V, ILOAD = 800 mA | 7 | ||
| Input Supply Current (switch off) | IS | 7.5 | 10 | mA | VFEEDBACK = 1.5V (Switch Off) | 7 | |
| Input Supply Current (switch on) | IS | 25 | 50 | mA | ISWITCH = 2.0A, VCOMP = 2.0V (Max Duty Cycle) | 7 | |
| Input Supply Undervoltage Lockout | VUV | 2.7 | 2.9 | 3.1 | V | ISWITCH = 100 mA | 7 |
| Oscillator Frequency | fO | 48 | 52 | 56 | kHz | Measured at Switch Pin, ISWITCH = 100 mA | 7 |
| Reference Voltage | VREF | 1.214 | 1.23 | 1.246 | V | Measured at Feedback Pin, VIN = 3.5V to 40V, VCOMP = 1.0V | 7 |
| Reference Voltage Line Regulation | ΔVREF/ΔVIN | 0.5 | mV | VIN = 3.5V to 40V | 7 | ||
| Error Amp Input Bias Current | IB | 100 | 300 | nA | VCOMP = 1.0V | 7 | |
| Error Amp Transconductance | GM | 2400 | 3700 | 4800 | μmho | ICOMP = −30 μA to +30 μA, VCOMP = 1.0V | 7 |
| Error Amp Voltage Gain | AVOL | 500 | 800 | V/V | VCOMP = 1.1V to 1.9V, RCOMP = 1.0 MΩ | 7 | |
| Error Amplifier Output Swing Upper Limit | 2.2 | 2.4 | V | VFEEDBACK = 1.0V | 7 | ||
| Error Amplifier Output Swing Lower Limit | 0.3 | 0.4 | V | VFEEDBACK = 1.5V | 7 | ||
| Error Amp Output Current | 130 | 200 | 300 | μA | VFEEDBACK = 1.0V to 1.5V, VCOMP = 1.0V; printed ± | 8 | |
| Soft Start Current | ISS | 2.5 | 5 | 7.5 | μA | VFEEDBACK = 1.0V, VCOMP = 0V | 8 |
| Maximum Duty Cycle | D | 93 | 95 | % | VCOMP = 1.5V, ISWITCH = 100 mA | 8 | |
| Switch Transconductance | ΔISWITCH/ΔVCOMP | 12.5 | A/V | 8 | |||
| Switch Leakage Current | IL | 10 | 300 | μA | VSWITCH = 65V, VFEEDBACK = 1.5V (Switch Off) | 8 | |
| Switch Saturation Voltage | VSAT | 0.5 | 0.7 | V | ISWITCH = 2.0A, VCOMP = 2.0V (Max Duty Cycle) | 8 | |
| NPN Switch Current Limit | 3.7 | 4.3 | 5.3 | A | VCOMP = 2.0V | 8 | |
| Supply Voltage | 45 | V | 3 | ||||
| Output Switch Voltage | 65 | V | 3 | ||||
| Output Switch Current | 6 | A | must be externally limited when used as step-up regulator | 3 | |||
| Storage Temperature Range | -65 | 150 | °C | 3 | |||
| Lead Temperature | 260 | °C | Soldering, 10 sec. | 3 | |||
| Maximum Junction Temperature | 150 | °C | 3 | ||||
| Minimum ESD Rating | 2 | kV | C = 100 pF, R = 1.5 kΩ | 3 | |||
| Supply Voltage | VIN | 3.5 | 40 | V | Operating Ratings | 3 | |
| Output Switch Voltage | VSWITCH | 0 | 60 | V | Operating Ratings | 3 | |
| Output Switch Current | ISWITCH | 3 | A | Operating Ratings | 3 | ||
| Junction Temperature Range | TJ | -40 | 125 | °C | LM2577 | 3 | |
| Thermal Resistance Junction to Ambient | θJA | 37 | °C/W | S Package (DDPAK/TO-263), 1 square inch copper | 8 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper | (6) Junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. Additional copper | 8 |
CAD (KiCad official)
- Symbol:
LM2577SX-ADJ - Footprint:
Package_TO_SOT_SMD:TO-263-5_TabPin6 - 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files:
lm2577sx-adj-etched.step/lm2577sx-adj-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm2577sx-adj.step/lm2577sx-adj.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (40 pp, sha256
5eafda8ce16a4e6f, retrieved 2026-10-26, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).