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MP2149GJ-Z

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Monolithic Power Systems DC-DC Converters, TSOT-23-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MP2149GJ-Z

Monolithic Power Systems · DC-DC Converters · TSOT-23-8

MP2149GJ-Z from Monolithic Power Systems, in a TSOT-23-8. 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 FB2 input Feedback 2 error amplifier input; connect to the tap of an external resistor divider between the output and GND to set the regulation voltage (0.608V reference).
2 EN2 input Channel 2 enable input for the buck converter; high threshold 1.2V, low threshold 0.4V.
3 SW2 passive Channel 2 switch node connecting the internal high-side and low-side power MOSFETs to the inductor.
4 EN1 input Channel 1 enable input for the buck converter; high threshold 1.2V, low threshold 0.4V.
5 GND power_in Ground pin; connect to a GND plane on the PCB for heat sinking.
6 SW1 passive Channel 1 switch node connecting the internal high-side and low-side power MOSFETs to the inductor.
7 IN power_in Input supply, 2.7V to 6V operating range; requires a decoupling capacitor to ground to reduce switching spikes.
8 FB1 input Feedback 1 error amplifier input; connect to the tap of an external resistor divider between the output and GND to set the regulation voltage (0.608V reference).

Key specifications

Parameter Value
Manufacturer Monolithic Power Systems
Package TSOT-23-8
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 VIN 6.5 V 2
SW Voltage VSW -0.3 6.5 V -3V for <10ns min; 7.5V for <10ns max 2
All Other Pins -0.3 6.5 V 2
Continuous Power Dissipation PD 1.25 W TA = +25°C 2
Output Voltage VOUT 0.608 5.5 V 2
Operating Junction Temperature TJ -40 125 °C 2
Thermal Resistance Junction-Ambient θJA 100 °C/W TSOT23-8, JESD51-7 4-layer PCB 2
Thermal Resistance Junction-Case θJC 55 °C/W TSOT23-8, JESD51-7 4-layer PCB 2
Supply Current (Quiescent) IQ 35 45 55 μA VIN=3.6V, VEN=2V, VFB = 0.65V 3
Shutdown Current 0 1 μA VEN = 0V 3
IN Under-Voltage Lockout Threshold 2.4 2.5 2.6 V Rising edge 3
Regulated FB Voltage VFB 0.596 0.608 0.62 V TA = +25°C 3
FB Input Current -10 50 nA VFB = 0.608V 3
SW Leakage Current -1 0 1 μA VEN = 0V; VIN = 6V; VSW = 0V and 6V 3
Oscillator Frequency 0.8 1 1.2 MHz Both channels work in CCM 3
IN Under-Voltage Lockout Hysteresis 300 mV 3
EN, HIGH Threshold 1.2 V -40°C ≤ TA ≤ +85°C 3
EN, LOW Threshold 0.4 V -40°C ≤ TA ≤ +85°C 3
Internal Soft-Start Time τSS 0.5 ms 3
High-Side Switch On-Resistance RDSON_P 100 mΩ VIN=5V 3
Low-Side Switch On-Resistance RDSON_N 40 mΩ VIN=5V 3
High-Side Switch Current Limit 2.5 A Sourcing, D=40% 3
Minimum ON Time τON_MIN 90 ns Guarantee by design 3
Minimum OFF Time τOFF_MIN 100 ns 3
Maximum Duty Cycle 100 % 3
Thermal Shutdown Threshold 160 °C Hysteresis = 30°C 3

CAD (KiCad official)

  • Symbol: MP2149GJ-Z
  • Footprint: Package_TO_SOT_SMD:TSOT-23-8
  • 3D model: TSOT-23-8 (KiCad packages3D, STEP)
  • 3D model files: mp2149gj-z-etched.step / mp2149gj-z-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mp2149gj-z.step / mp2149gj-z.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Monolithic Power Systems datasheet (13 pp, sha256 6f6e037e94814d85, retrieved 2026-10-23, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-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).

Datasheet PDF