component
TMI3256B
Public Made by Adomby adom
TMI DC-DC Converters, DFN-6-EP(2x2). 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
markdownTMI3256B
TMI · DC-DC Converters · DFN-6-EP(2x2)
TMI3256B from TMI, in a DFN-6-EP(2x2). 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 | IN | power_in | Power supply pin; input voltage range is 4.5V to 18V per the recommended operating conditions. |
| 2 | LX | output | Switching pin; absolute maximum LX voltage is -0.3V to 20V, with -4.5V to 22V allowed for transients under 10ns. |
| 3 | GND | power_in | Ground pin. |
| 4 | BS | passive | Bootstrap pin; a capacitor connected between LX and BS is required to form a floating supply across the high-side switch driver. |
| 5 | EN | input | Drive to logic-high to enable the IC and to logic-low to disable it into micro-power shutdown; EN rising threshold is 0.95V to 1.25V and it must not be left floating. |
| 6 | FB | input | Output voltage feedback input connected to the center point of the external resistor divider; regulated feedback voltage is 0.788V to 0.812V. |
| 7 | GND | power_in | Ground and exposed pad; it must be connected to GND. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | TMI |
| Package | DFN-6-EP(2x2) |
| Category | Power Management (PMIC) |
| Pins | 7 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Supply Voltage, EN | -0.3 | 20 | V | 2 | |||
| LX Voltages | -0.3 | 20 | V | 2 | |||
| LX Voltages (<10ns transient) | -4.5 | 22 | V | <10ns transient | 2 | ||
| FB Voltage | -0.3 | 6 | V | 2 | |||
| BS Voltage | -0.3 | 23 | V | 2 | |||
| Storage Temperature Range | -65 | 150 | °C | 2 | |||
| Junction Temperature | 160 | °C | 2 | ||||
| Power Dissipation | 1500 | mW | 2 | ||||
| Lead Temperature (Soldering, 10s) | 260 | °C | Soldering, 10s | 2 | |||
| Voltage Range IN | IN | 4.5 | 18 | V | 3 | ||
| TJ Operating Junction Temperature | TJ | -40 | 125 | °C | 3 | ||
| Input Voltage Range | 4.5 | 18 | V | 4 | |||
| OVP Threshold | 18 | 19 | 20 | V | 4 | ||
| Quiescent Current | 340 | 600 | μA | VEN=2V, VFB=VREF x 105% | 4 | ||
| Shutdown Current | 5 | 15 | μA | VIN=12V, EN=0V | 4 | ||
| Regulated Feedback Voltage | VREF | 0.788 | 0.8 | 0.812 | V | TA=25°C | 4 |
| High-Side Switch Leakage Current | 1 | 10 | μA | VEN=0V, VLX=0V | 4 | ||
| On Time | 132 | 166 | 200 | ns | VIN=12V, VOUT=1.2V, IOUT=1A | 4 | |
| Oscillation Frequency | 450 | 600 | 750 | kHz | 4 | ||
| Minimum On-Time | 70 | 80 | 100 | ns | 4 | ||
| Soft Start Time | 0.6 | 1.2 | 1.8 | ms | 4 | ||
| EN Rising Threshold | 0.95 | 1.1 | 1.25 | V | 4 | ||
| OVP Hysteresis | 0.45 | V | 4 | ||||
| UVLO Rising Threshold | 4.2 | V | 4 | ||||
| UVLO Hysteresis | 0.5 | V | 4 | ||||
| High-Side Switch On-Resistance | 30 | mΩ | 4 | ||||
| Low-Side Switch On-Resistance | 16 | mΩ | 4 | ||||
| High-side Switch Peak Current Limit | 9 | A | 4 | ||||
| Low-side Switch Valley Current Limit | 7 | A | 4 | ||||
| Maximum Duty Cycle | 84 | % | 4 | ||||
| Hiccup on Time | 1.5 | ms | 4 | ||||
| Hiccup Time Before Restart | 15 | ms | 4 | ||||
| EN Hysteresis | 140 | mV | 4 | ||||
| Thermal Shutdown Threshold | 165 | °C | 4 | ||||
| Thermal Shutdown Hysteresis | 30 | °C | 4 | ||||
| Junction-to-ambient thermal resistance | θJA | 25 | °C/W | JESD51-7, 4-layer PCB | 3 | ||
| Junction-to-case(top) thermal resistance | θJC | 5 | °C/W | 3 |
CAD (KiCad official)
- Symbol:
TMI3256B - Footprint:
Package_DFN_QFN:DFN-6-1EP_2x2mm_P0.65mm_EP1x1.6mm - 3D model: DFN-6-EP(2x2) (KiCad packages3D, STEP)
- 3D model files:
tmi3256b-etched.step/tmi3256b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tmi3256b.step/tmi3256b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: TMI datasheet (13 pp, sha256
30814d9fc50e2041, retrieved 2026-10-28, 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).