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Verified 2026-10

pimoroni LM73100 23V 5A Max Ideal Diode Breakout

Texas Instruments LM73100 ideal-diode breakout that passes 2.7-23 V at up to 5.5 A with 28.4 mOhm typical on-resistance instead of a diode drop, with terminal blocks for solder-free wiring, a 9-pad 0.1 inch header, an IMON analogue current output and a latched overvoltage/overcurrent trip - $6.00 USD as measured at Pimoroni.

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Part & documents

Headline partLM73100
Data sheetLM73100 data sheet →
Sourceshop.pimoroni.com/products/adafruit-lm73100-23v-5a-max-ideal-diode-breakout →

Specs

MCUTexas Instruments LM73100RPWR

Pinout

9 pads, as the vendor numbers them.

#NameFunctionSignals
1VOUTideal-diode output, terminal block X2 pad 1
2IMONanalogue load-current monitor output, 1.8 V absolute maximum
3DVDTslew-rate / inrush current control
4PGTHpower-good threshold input
5PGOODpower good indication
6OVLOovervoltage lockout threshold
7ENactive-high enable / undervoltage lockout
8GNDground, terminal blocks X1 pad 1 and X2 pad 2
9VINpower input, terminal block X1 pad 2

Power

Input2.7-23 V DC on VIN / IN terminal block (absolute maximum 28 V, -15 V reverse tolerated)

Notes

Pad numbers are the Adafruit fab file's JP1 pad numbers (Adafruit-LM73100-Ideal-Diode-Breakout-PCB, 'Adafruit LM73100 Ideal Diode Breakout.brd'). The silk is PLABEL stroke artwork with no text objects, so each label is the net the fab file binds to that pad, not a read of a printed word; the learn guide names the same pins VIN, Vout, GND, UVLO, OVLO, PG, PGTH, DVDT and IMON, i.e. it prints EN as UVLO and PGOOD as PG. TI serves this part's data sheet under the family name: ti.com/lit/ds/symlink/lm73100.pdf 404s, lm7310.pdf returns application/pdf and its title page reads LM73100. The learn guide's pinout page says 3 V to 22 V while the datasheet's operating range is 2.7 V to 23 V; both are recorded. The learn guide calls the LM62200 dual ideal diode (product 5830) the alternative when two inputs must be ORed - this board is one diode only.

AI context

Dense context for pasting into a model prompt — addresses, pinout, voltages, tolerances and the vendor's reference circuit.

BOARD: Adafruit 6359, a 23 x 18 mm breakout built around the Texas Instruments LM73100RPWR ideal diode (WSON-10 package, back-to-back N-channel FETs) for insertion inline in a DC power path. It replaces a blocking diode with no forward drop: RON is 28.4 mOhm typical, so 5 A costs about 150 mV instead of the 1 V-plus a Schottky would burn. Two 3.5 mm two-way screw terminal blocks (IN on the left edge, OUT on the right) let it be wired into a circuit with no solder, and a 9-pin 0.1 inch header (JP1) breaks every pin out for breadboard use; header is supplied loose, so soldering is required to use it. Resold by Pimoroni; the maker is Adafruit.
ADDRESSES: none. There is no I2C or SPI device on this board, so addresses is empty by measurement, not by omission.
PINOUT: 9 pads, JP1 1x9 (0.1 inch round holes), pad numbers are the Adafruit fab file's JP1 pad numbers and the labels are that file's net names, because Adafruit prints this board's silk as stroke artwork with no text objects. Pad 1 = VOUT (ideal-diode output), 2 = IMON (analogue load-current monitor), 3 = DVDT (slew-rate / inrush control), 4 = PGTH (power-good threshold), 5 = PGOOD (power good; the learn guide prints this pin as PG), 6 = OVLO (overvoltage lockout), 7 = EN (enable / undervoltage lockout; the learn guide prints this pin as UVLO), 8 = GND, 9 = VIN. The terminal blocks carry the same three nets: X1 pad 1 = GND and pad 2 = VIN, X2 pad 1 = VOUT and pad 2 = GND.
SUPPLY: the datasheet operating range is 2.7 V to 23 V; the learn guide tells the user to give it 3 V to 22 V DC. Absolute maximum on IN is 28 V, with the parts able to withstand -15 V of reverse polarity. Continuous switch current is 5.5 A maximum, and the IMON output is specified for 0.5 A to 5.5 A at plus or minus 15 percent.
LOGIC LEVEL: no logic rail - the control pins are named-voltage pins of their own. EN/UVLO, OVLO, PGTH and PG are each -0.3 V to 6.5 V absolute maximum, so a 3.3 V or 5 V GPIO drives them directly but 12 V on one destroys the part. IMON is the exception at 1.8 V absolute maximum, and it is an analogue output meant for an ADC, not an input. Exceeding the IMON limit happens easily if the pin is probed against VIN.
REFERENCE CIRCUIT: every resistor here is fitted and readable in the fab file netlist, not a recommendation. R1 is 1 MOhm from VIN to EN, which sets the undervoltage lockout and matches the datasheet's advice to use 350 kOhm or more when a control pin is pulled up to VIN, so a reverse-polarity event cannot drag current through it. The overvoltage threshold is the divider R2 580 kOhm (EN to OVLO) into R3 87 kOhm (OVLO to GND). IMON has R8 1.5 kOhm to GND, which is the RIMON the vendor's own example code reads off pin A0 at GIMON 2.5 microamp per amp. DVDT has C3 22 nF in series with R7 100 Ohm to GND. Decoupling is C1 10 uF / 25 V across VIN-GND and C2 10 uF / 25 V across VOUT-GND.
TRAPS: fault behaviour is latch-off - after an overcurrent or overvoltage event the device stays off rather than retrying, so a design that expects auto-recovery must cycle enable. The green power LED is fed from VOUT through R4 47 kOhm and the solder jumper SJ1 on the back of the board, labelled LED on the silk; cut that trace to kill the LED's (small) draw, and leaving it closed means the LED lights only when current is flowing the permitted direction. PGOOD is an indication pin, not an enable. The board is one diode only - two of them in parallel are not a load-sharing bus without extra circuitry. The two terminal blocks are not isolated from each other or from the header: IN, OUT and GND are all common nets with the 0.1 inch pads, so wiring both a breadboard and a terminal block is wiring the same node twice.

Provenance

Every figure on this page was read from the 5 sources below and last checked on Oct 31, 2026.