component
MP2122AGJ-Z
Public Made by Adomby adom
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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MP2122AGJ-Z
Monolithic Power Systems · DC-DC Converters · TSOT-23-8
MP2122AGJ-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 is the error amplifier input for channel 2, connected to the tap of an external divider between the output and GND to set the regulation voltage (reference 0.608V). |
| 2 | EN2 | input | Channel 2 enable input for buck 2, with an EN high threshold of 1.2V and an EN low threshold of 0.4V over -40°C to +85°C. |
| 3 | SW2 | output | Channel 2 switch node connects the channel 2 high-side and low-side power MOSFETs to the inductor. |
| 4 | EN1 | input | Channel 1 enable input for buck 1, with an EN high threshold of 1.2V and an EN low threshold of 0.4V over -40°C to +85°C. |
| 5 | GND | power_in | Ground reference for the device, which also serves as the heat sink connection to the PCB GND plane. |
| 6 | SW1 | output | Channel 1 switch node connects the channel 1 high-side and low-side power MOSFETs to the inductor. |
| 7 | IN | power_in | Input supply operating from 2.7V to 6V, which requires a decoupling capacitor to ground to reduce switching spikes. |
| 8 | FB1 | input | Feedback 1 is the error amplifier input for channel 1, connected to the tap of an external divider between the output and GND to set the regulation voltage (reference 0.608V). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Monolithic Power Systems |
| Package | TSOT-23-8 |
| Category | Power Supply Chip |
| 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) | VIN | 2.7 | 6 | V | 2 | ||
| Output voltage | VOUT | 0.608 | 5.5 | V | 2 | ||
| Operating junction temperature | TJ | -40 | 125 | °C | 2 | ||
| Supply voltage (VIN) | VIN | 6.5 | V | 2 | |||
| VSW switch node voltage | VSW | -0.3 | 6.5 | V | -3V for <10ns; 7.5V for <10ns | 2 | |
| All other pins voltage | -0.3 | 6.5 | V | 2 | |||
| Junction-to-ambient thermal resistance TSOT23-8 | θJA | 100 | °C/W | JESD51-7, 4-layer PCB | 2 | ||
| Junction-to-case thermal resistance TSOT23-8 | θJC | 55 | °C/W | 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 | 1 | μA | VEN = 0V | 3 | |||
| IN under-voltage lockout threshold | 2.4 | 2.5 | 2.6 | V | Rising edge | 3 | |
| IN under-voltage lockout hysteresis | 300 | mV | 3 | ||||
| Regulated FB voltage | VFB | 0.596 | 0.608 | 0.62 | V | TA = +25°C | 3 |
| FB input current | 50 | nA | VFB = 0.608V | 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 | 80 | mΩ | VIN = 5V | 3 | ||
| Low-side switch on resistance | RDSON_N | 35 | mΩ | VIN = 5V | 3 | ||
| SW leakage current | -1 | 0 | 1 | μA | VEN = 0V, VIN = 6V, VSW = 0V and 6V | 3 | |
| High-side switch current limit | 2.8 | 3.5 | 4.5 | A | Sourcing, D = 40% | 3 | |
| Oscillator frequency | 0.8 | 1 | 1.2 | MHz | Both channels work in CCM | 3 | |
| Phase shift | 180 | degree | 3 | ||||
| Minimum on time | τON_MIN | 90 | ns | 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:
MP2122AGJ-Z - Footprint:
Package_TO_SOT_SMD:TSOT-23-8 - 3D model: TSOT-23-8 (KiCad packages3D, STEP)
- 3D model files:
mp2122agj-z-etched.step/mp2122agj-z-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mp2122agj-z.step/mp2122agj-z.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Monolithic Power Systems datasheet (16 pp, sha256
a457df4f2372cf1c, retrieved 2026-10-27, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusoff(skipped (clean text read)), 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).
# MP2122AGJ-Z
**Monolithic Power Systems** · DC-DC Converters · TSOT-23-8
MP2122AGJ-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 is the error amplifier input for channel 2, connected to the tap of an external divider between the output and GND to set the regulation voltage (reference 0.608V). |
| 2 | EN2 | input | Channel 2 enable input for buck 2, with an EN high threshold of 1.2V and an EN low threshold of 0.4V over -40°C to +85°C. |
| 3 | SW2 | output | Channel 2 switch node connects the channel 2 high-side and low-side power MOSFETs to the inductor. |
| 4 | EN1 | input | Channel 1 enable input for buck 1, with an EN high threshold of 1.2V and an EN low threshold of 0.4V over -40°C to +85°C. |
| 5 | GND | power_in | Ground reference for the device, which also serves as the heat sink connection to the PCB GND plane. |
| 6 | SW1 | output | Channel 1 switch node connects the channel 1 high-side and low-side power MOSFETs to the inductor. |
| 7 | IN | power_in | Input supply operating from 2.7V to 6V, which requires a decoupling capacitor to ground to reduce switching spikes. |
| 8 | FB1 | input | Feedback 1 is the error amplifier input for channel 1, connected to the tap of an external divider between the output and GND to set the regulation voltage (reference 0.608V). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Monolithic Power Systems |
| Package | TSOT-23-8 |
| Category | Power Supply Chip |
| 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) | VIN | 2.7 | | 6 | V | | 2 |
| Output voltage | VOUT | 0.608 | | 5.5 | V | | 2 |
| Operating junction temperature | TJ | -40 | | 125 | °C | | 2 |
| Supply voltage (VIN) | VIN | | | 6.5 | V | | 2 |
| VSW switch node voltage | VSW | -0.3 | | 6.5 | V | -3V for <10ns; 7.5V for <10ns | 2 |
| All other pins voltage | | -0.3 | | 6.5 | V | | 2 |
| Junction-to-ambient thermal resistance TSOT23-8 | θJA | | 100 | | °C/W | JESD51-7, 4-layer PCB | 2 |
| Junction-to-case thermal resistance TSOT23-8 | θJC | | 55 | | °C/W | 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 | | | | 1 | μA | VEN = 0V | 3 |
| IN under-voltage lockout threshold | | 2.4 | 2.5 | 2.6 | V | Rising edge | 3 |
| IN under-voltage lockout hysteresis | | | 300 | | mV | | 3 |
| Regulated FB voltage | VFB | 0.596 | 0.608 | 0.62 | V | TA = +25°C | 3 |
| FB input current | | | | 50 | nA | VFB = 0.608V | 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 | | 80 | | mΩ | VIN = 5V | 3 |
| Low-side switch on resistance | RDSON_N | | 35 | | mΩ | VIN = 5V | 3 |
| SW leakage current | | -1 | 0 | 1 | μA | VEN = 0V, VIN = 6V, VSW = 0V and 6V | 3 |
| High-side switch current limit | | 2.8 | 3.5 | 4.5 | A | Sourcing, D = 40% | 3 |
| Oscillator frequency | | 0.8 | 1 | 1.2 | MHz | Both channels work in CCM | 3 |
| Phase shift | | | 180 | | degree | | 3 |
| Minimum on time | τON_MIN | | 90 | | ns | | 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: `MP2122AGJ-Z`
- Footprint: `Package_TO_SOT_SMD:TSOT-23-8`
- 3D model: TSOT-23-8 (KiCad packages3D, STEP)
- 3D model files: `mp2122agj-z-etched.step` / `mp2122agj-z-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mp2122agj-z.step` / `mp2122agj-z.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Monolithic Power Systems datasheet](docs/mp2122agj-z-datasheet.pdf) (16 pp, sha256 `a457df4f2372cf1c`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `off` (skipped (clean text read)), 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](docs/mp2122agj-z-datasheet.pdf)