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LTC1261LCMS8#TRPBF
Public Made by Adomby adom
Analog Devices DC-DC Converters, MSOP-8. 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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README
markdownLTC1261LCMS8#TRPBF
Analog Devices · DC-DC Converters · MSOP-8
LTC1261LCMS8#TRPBF from Analog Devices, in a MSOP-8. 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 | VCC | power_in | Power supply input requiring 2.7V to 5.25V, bypassed to ground with at least a 1µF capacitor placed close to the chip. |
| 2 | C1+ | passive | Positive terminal of the flying capacitor, which connects to a 0.1µF capacitor between C1+ and C1-. |
| 3 | C1- | passive | Negative terminal of the flying capacitor, which connects to a 0.1µF capacitor between C1+ and C1-. |
| 4 | GND | power_in | Ground, which should connect to a low-impedance ground plane to minimize regulation errors. |
| 5 | ADJ (COMP) | input | Output adjust pin for adjustable parts (resistor divider from OUT, drawing at least 10µA recommended) and compensation pin for fixed-output parts, where an optional capacitor to ground reduces output ripple. |
| 6 | OUT | power_out | Negative voltage output that must be bypassed to ground with a 1µF or larger capacitor. |
| 7 | REG | output | Open-drain output that pulls low when the output is within 5% of the set value, sinks 5mA with a 5V supply, requires an external pull-up, and may be pulled up to 6V above ground. |
| 8 | SHDN | input | Shutdown input: at ground the part operates normally, while a high level disables the charge pump and drops quiescent current to 5µA typical, with an internal 5µA pull-down keeping it low when floating. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | MSOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 2.7 | 5.25 | V | 3 | ||
| Supply Current (SHDN floating) | ICC | 650 | 1500 | µA | VCC = 5.25V, No Load, SHDN Floating | 3 | |
| Supply Current (SHDN high, shutdown) | ICC | 5 | 20 | µA | VCC = 5.25V, No Load, VSHDN = VCC | 3 | |
| REG Output Low Voltage | VOL | 0.1 | 0.8 | V | IREG = 1mA, VCC = 5V, VOUT = -4V | 3 | |
| REG Sink Current | IREG | 4 | 8 | mA | VREG = 0.8V, VCC = 3.3V | 3 | |
| REG Sink Current | IREG | 5 | 12 | mA | VREG = 0.8V, VCC = 5V | 3 | |
| Adjust Pin Current | IADJ | 0.01 | 1 | µA | VADJ = 1.23V | 3 | |
| SHDN Input High Voltage | VIH | 2 | V | VCC = 5V | 3 | ||
| SHDN Input Low Voltage | VIL | 0.8 | V | VCC = 5V | 3 | ||
| SHDN Input Current | IIN | 2.5 | 25 | µA | VSHDN = VCC | 3 | |
| Turn-On Time | tON | 250 | 1500 | µs | VCC = 5V, IOUT = 10mA, -1.5V ≤ VOUT ≤ -4V (LTC1261L) | 3 | |
| Output Regulation (LTC1261L) | VOUT | -1.552 | -1.5 | -1.448 | V | 2.70V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 10mA | 3 |
| Output Regulation (LTC1261L) | VOUT | -2.07 | -2 | -1.93 | V | 2.70V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 5mA | 3 |
| Output Regulation (LTC1261L) | VOUT | -2.07 | -2 | -1.91 | V | 3.50V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 20mA | 3 |
| Output Regulation (LTC1261L) | VOUT | -2.587 | -2.5 | -2.413 | V | 2.95V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 5mA | 3 |
| Output Regulation (LTC1261L) | VOUT | -2.587 | -2.5 | -2.41 | V | 3.85V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 20mA | 3 |
| Output Regulation (LTC1261L) | VOUT | -3.105 | -3 | -2.895 | V | 3.40V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 5mA | 3 |
| Output Regulation (LTC1261L) | VOUT | -3.105 | -3 | -2.885 | V | 4.25V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 20mA | 3 |
| Output Regulation (LTC1261L) | VOUT | -3.622 | -3.5 | -3.378 | V | 3.85V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 5mA | 3 |
| Output Regulation (LTC1261L) | VOUT | -3.622 | -3.5 | -3.365 | V | 4.60V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 20mA | 3 |
| Output Regulation (LTC1261L/LTC1261L-4) | VOUT | -4.14 | -4 | -3.86 | V | 4.35V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 5mA | 3 |
| Output Regulation (LTC1261L/LTC1261L-4) | VOUT | -4.14 | -4 | -3.83 | V | 5.10V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 20mA | 3 |
| Output Regulation (LTC1261L/LTC1261L-4.5) | VOUT | -4.657 | -4.5 | -4.343 | V | 4.75V ≤ VCC ≤ 5.25V, 0mA ≤ IOUT ≤ 5mA | 3 |
| Output Short-Circuit Current | ISC | 100 | 220 | mA | VOUT = 0V, VCC = 5.25V | 3 | |
| Output Voltage | -5.3 | 0.3 | V | Note 3 | 2 | ||
| Total Voltage VCC to VOUT | 10.8 | V | Note 2 | 2 | |||
| SHDN Pin | -0.3 | V | Upper limit printed as (VCC + 0.3V) | 2 | |||
| REG Pin | -0.3 | 6 | V | 2 | |||
| Storage Temperature Range | -65 | 150 | °C | 2 | |||
| Lead Temperature (Soldering) | 300 | °C | 10 sec | 2 | |||
| Commercial Temperature Range (LTC1261LC) | 0 | 70 | °C | Commercial grade; not tested at -40°C and 85°C (Note 4) | 2 | ||
| Maximum Junction Temperature (MS8) | TJMAX | 150 | °C | MS8 package | 2 | ||
| Thermal Resistance Junction-to-Ambient (MS8) | θJA | 200 | °C/W | MS8 package | 2 |
CAD (KiCad official)
- Symbol:
LTC1261LCMS8#TRPBF - Footprint:
Package_SO:MSOP-8_3x3mm_P0.65mm - 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files:
ltc1261lcms8-trpbf-etched.step/ltc1261lcms8-trpbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ltc1261lcms8-trpbf.step/ltc1261lcms8-trpbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (14 pp, sha256
336624392408a8a5, retrieved 2026-10-19, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-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).