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TL2845BDR-8
Public Made by Adomby adom
Texas Instruments DC-DC Controllers, SOIC-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
markdownTL2845BDR-8
Texas Instruments · DC-DC Controllers · SOIC-8
TL2845BDR-8 from Texas Instruments, in a SOIC-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 | COMP | output | Error amplifier output for loop compensation; it can source or sink up to 0.5 mA, and pulling it below two diode drops above ground shuts down the PWM. |
| 2 | VFB | input | Error amplifier inverting feedback input, regulated to 2.5 V (2.45 to 2.55 V on TL284xB), with a recommended input range of 0 to 5.5 V. |
| 3 | ISENSE | input | Current-sense comparator input with a 1 V threshold (peak current IS(max) = 1 V/RS), recommended range 0 to 5.5 V; raising it above 1 V shuts down the output. |
| 4 | RT/CT | passive | Oscillator timing pin for the external RT to VREF and CT to GND, with an oscillator frequency range of 100 to 500 kHz and an input range of 0 to 5.5 V. |
| 5 | GND | power_in | Ground reference for all device voltages, and the single-point ground for the timing and bypass capacitors. |
| 6 | OUTPUT | output | Totem-pole output stage that drives N-channel MOSFETs, with ±1 A absolute maximum output current, 200 mA recommended average output current and 0 to 30 V output voltage; it is low when off. |
| 7 | VCC | power_in | Supply input with a 30 V maximum, typical UVLO start threshold of 8.4 V and turn-off at 7.6 V for the TLx845B, and a 34 V (typ) limiting voltage at ICC = 25 mA. |
| 8 | VREF | power_out | Trimmed 5 V reference output (4.95 to 5.05 V for TL284xB at 1 mA) that supplies up to 20 mA and sets the oscillator RT. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Reference output voltage | VREF | 4.95 | 5 | 5.05 | V | IO = 1 mA, TJ = 25°C | 5 |
| Reference line regulation | 6 | 20 | mV | VCC = 12 V to 25 V | 5 | ||
| Reference load regulation | 6 | 25 | mV | IO = 1 mA to 20 mA | 5 | ||
| Avg temp coefficient of reference output voltage | 0.2 | 0.4 | mV/°C | 5 | |||
| Reference output voltage, worst-case variation | VREF | 4.9 | 5.1 | V | VCC = 12 V to 25 V, IO = 1 mA to 20 mA | 5 | |
| Reference output noise voltage | 50 | μV | f = 10 Hz to 10 kHz, TJ = 25°C | 5 | |||
| Reference long-term drift | 5 | 25 | mV | After 1000 h at TJ = 25°C | 5 | ||
| Reference short-circuit output current | -30 | -100 | -180 | mA | 5 | ||
| Oscillator initial accuracy | 49 | 52 | 55 | kHz | TJ = 25°C | 5 | |
| Oscillator initial accuracy over temperature | 48 | 56 | kHz | TA = Tlow to Thigh | 5 | ||
| Oscillator initial accuracy (250 kHz) | 225 | 250 | 275 | kHz | TJ = 25°C, RT = 6.2 kΩ, CT = 1 nF | 5 | |
| Oscillator voltage stability | 0.2 | 1 | % | VCC = 12 V to 25 V | 5 | ||
| Oscillator temperature stability | 5 | % | 5 | ||||
| Oscillator amplitude | 1.7 | V | Peak to peak | 5 | |||
| Oscillator discharge current | 7.8 | 8.3 | 8.8 | mA | TJ = 25°C, RT/CT = 2 V | 5 | |
| Oscillator discharge current over temperature | 7.5 | 8.8 | mA | RT/CT = 2 V | 5 | ||
| Feedback input voltage | VFB | 2.45 | 2.5 | 2.55 | V | COMP = 2.5 V | 6 |
| Error amp input bias current | -0.3 | -1 | μA | 6 | |||
| Open-loop voltage amplification | AVOL | 65 | 90 | dB | VO = 2 V to 4 V | 6 | |
| Gain-bandwidth product | 0.7 | 1 | MHz | 6 | |||
| Supply-voltage rejection ratio (error amp) | 60 | 70 | dB | VCC = 12 V to 25 V | 6 | ||
| Error amp output sink current | 2 | 6 | mA | VFB = 2.7 V, COMP = 1.1 V | 6 | ||
| Error amp output source current | -0.5 | -0.8 | mA | VFB = 2.3 V, COMP = 5 V | 6 | ||
| Error amp high-level output voltage | 5 | 6 | V | VFB = 2.3 V, RL = 15 kΩ to GND | 6 | ||
| Error amp low-level output voltage | 0.7 | 1.1 | V | VFB = 2.7 V, RL = 15 kΩ to GND | 6 | ||
| Current-sense voltage amplification | 2.85 | 3 | 3.15 | V/V | 6 | ||
| Current-sense comparator threshold | 0.9 | 1 | 1.1 | V | COMP = 5 V | 6 | |
| Current-sense supply-voltage rejection ratio | 70 | dB | VCC = 12 V to 25 V | 6 | |||
| Current-sense input bias current | -2 | -10 | μA | 6 | |||
| Current-sense delay time to output | 150 | 300 | ns | VFB = 0 V to 2 V | 6 | ||
| Output high-level voltage | VOH | 13 | 13.5 | V | IOH = -20 mA | 7 | |
| Output high-level voltage | VOH | 12 | 13.5 | V | IOH = -200 mA | 7 | |
| Output low-level voltage | VOL | 0.1 | 0.4 | V | IOL = 20 mA | 7 | |
| Output low-level voltage | VOL | 1.5 | 2.2 | V | IOL = 200 mA | 7 | |
| Output rise time | tr | 50 | 150 | ns | CL = 1 nF, TJ = 25°C | 7 | |
| Output fall time | tf | 50 | 150 | ns | CL = 1 nF, TJ = 25°C | 7 | |
| UVLO saturation | 0.7 | 1.2 | V | VCC = 5 V, IOL = 1 mA | 7 | ||
| Start threshold voltage | 7.8 | 8.4 | 9 | V | TLx843B, TLx845B | 7 | |
| Minimum operating voltage after start-up | 7 | 7.6 | 8.2 | V | TLx843B, TLx845B | 7 | |
| Maximum duty cycle | 47 | 48 | 50 | % | TL3844B, TL3845B | 7 | |
| Start-up current | 0.3 | 0.5 | mA | 7 | |||
| Operating supply current | 11 | 17 | mA | VFB and ISENSE at 0 V | 7 | ||
| Limiting voltage | 30 | 34 | V | ICC = 25 mA | 7 | ||
| Supply voltage | VCC | 30 | V | Low impedance source; self limiting for ICC < 30 mA | 4 | ||
| Analog input voltage range | VI | -0.3 | 6.3 | V | VFB and ISENSE | 4 | |
| Supply current | ICC | 30 | mA | 4 | |||
| Output current | IO | -1 | 1 | A | 4 | ||
| Error amplifier output sink current | IO(sink) | 10 | mA | 4 | |||
| Output energy | 5 | μJ | Capacitive load | 4 | |||
| Virtual junction temperature | TJ | 150 | °C | 4 | |||
| Storage temperature range | Tstg | -65 | 150 | °C | 4 | ||
| Lead temperature | Tlead | 300 | °C | Soldering, 10 s | 4 | ||
| Package thermal impedance | θJA | 97 | °C/W | D package, 8 pin | 4 | ||
| Supply voltage | VCC | 30 | V | 4 | |||
| Input voltage RT/CT | VI | 0 | 5.5 | V | RT/CT | 4 | |
| Input voltage VFB and ISENSE | VI | 0 | 5.5 | V | VFB and ISENSE | 4 | |
| Output voltage | VO | 0 | 30 | V | OUTPUT | 4 | |
| Supply current, externally limited | ICC | 25 | mA | 4 | |||
| Average output current | IO | 200 | mA | 4 | |||
| Reference output current | IO(ref) | -20 | mA | 4 | |||
| Oscillator frequency | fosc | 100 | 500 | kHz | 4 | ||
| Operating free-air temperature | TJ | -40 | 85 | °C | TL284xB | 4 |
CAD (KiCad official)
- Symbol:
TL2845BDR-8 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
tl2845bdr-8-etched.step/tl2845bdr-8-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl2845bdr-8.step/tl2845bdr-8.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (26 pp, sha256
804a10c86a6d4bdb, retrieved 2026-10-27, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).