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LT3973EDD#TRPBF

Public Made by Adom

by adom

Analog Devices DC-DC Converters, DFN-10-EP(3x3). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

componentpower management (pmic)lt3973edd#trpbf
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LT3973EDD#TRPBF

Analog Devices · DC-DC Converters · DFN-10-EP(3x3)

LT3973EDD#TRPBF from Analog Devices, in a DFN-10-EP(3x3). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 FB input Feedback pin for the adjustable LT3973. The internal error amplifier regulates FB to 1.21V; connect the tap of the external resistor divider from VOUT to GND here. FB bias current is typically 0.1nA (20nA max).
2 OUT power_in Output-sense pin used by the LT3973 to regulate the VIN-to-VOUT voltage during dropout conditions and to draw current for charging the boost capacitor. Connect to the regulated output; if the programmed output is greater than 14V, tie this pin to GND. Absolute max 14V.
3 EN/UVLO input Enable / undervoltage-lockout input. The part is in shutdown when this pin is low and active when high; the internal threshold is 1.19V rising with 30mV hysteresis (accurate only when VIN ≥ 4.2V). Tie to VIN if the shutdown feature is unused, or ground to force shutdown. Absolute max 42V.
4 VIN power_in Main supply input, 4.2V to 42V operating (42V absolute max). VIN supplies the internal circuitry and the internal power switch. Must be locally bypassed with a low-ESR ceramic capacitor.
5 GND power_in Device ground reference. Must be tied together with the exposed pad (pin 11) on the PCB. Serves as the return for VIN, EN/UVLO, and internal circuitry.
6 SW output Switch node - output of the internal high-side NPN power switch and drain of the integrated catch Schottky. Connect this pin to the external inductor. Sees VIN plus a diode drop during off-time; internal catch-diode current limit is typically 1.15A.
7 BOOST passive Bootstrap pin used to generate a drive voltage higher than VIN for the internal NPN power switch. A ceramic boost capacitor (typ. 0.47µF) is connected from BOOST to SW. Absolute max 55V (25V above SW).
8 BD power_in Boost-diode anode. Connect through the boost capacitor charging path - this pin drives the anode of the internal boost Schottky and also supplies current to the LT3973's internal regulator whenever BD is above 3.2V. Absolute max 25V.
9 PG output Power-good open-drain output from an internal comparator. PG remains low until FB is within 10% of the final regulation voltage; it is valid once VIN > 4.2V and EN/UVLO is high. Sink capability typ. 350µA at 0.4V; leakage 0.01µA at 3V. Add an external pull-up resistor.
10 RT passive Switching-frequency programming pin. Connect an external resistor from RT to GND to program the oscillator between 200kHz and 2.2MHz (e.g. 41.2k → 2.15MHz, 158k → 790kHz, 768k → 195kHz).
11 GND (Exposed Pad) power_in Exposed thermal pad on the underside of the DFN package. Electrically GND - must be soldered to the PCB ground plane for proper electrical and thermal performance (θJA = 40°C/W for the DD package).

Key specifications

Parameter Value
Manufacturer Analog Devices
Package DFN-10-EP(3x3)
Category Power Management (PMIC)
Pins 11

Ordering variants

Same part, different packaging or reel option.

  • LT3973EDD#PBF
  • LT3973EDD#TRPBF
  • LT3973EDD#TRPBFIDD#PBF
  • LT3973EDD#TRPBFIDD#TRPBF
  • LT3973EDD#TRPBFHDD#PBF
  • LT3973EDD#TRPBFHDD#TRPBF
  • LT3973EDD#TRPBFEDD-3.3#PBF
  • LT3973EDD#TRPBFEDD-3.3#TRPBF
  • LT3973EDD#TRPBFIDD-3.3#PBF
  • LT3973EDD#TRPBFIDD-3.3#TRPBF
  • LT3973EDD#TRPBFHDD-3.3#PBF
  • LT3973EDD#TRPBFHDD-3.3#TRPBF
  • LT3973EDD#TRPBFEDD-5#PBF
  • LT3973EDD#TRPBFEDD-5#TRPBF
  • LT3973EDD#TRPBFIDD-5#PBF
  • LT3973EDD#TRPBFIDD-5#TRPBF
  • LT3973EDD#TRPBFHDD-5#PBF
  • LT3973EDD#TRPBFHDD-5#TRPBF
  • LT3973EDD#TRPBFEMSE#PBF
  • LT3973EDD#TRPBFEMSE#TRPBF
  • LT3973EDD#TRPBFIMSE#PBF
  • LT3973EDD#TRPBFIMSE#TRPBF
  • LT3973EDD#TRPBFHMSE#PBF
  • LT3973EDD#TRPBFHMSE#TRPBF
  • LT3973EDD#TRPBFEMSE-3.3#PBF
  • LT3973EDD#TRPBFEMSE-3.3#TRPBF
  • LT3973EDD#TRPBFIMSE-3.3#PBF
  • LT3973EDD#TRPBFIMSE-3.3#TRPBF
  • LT3973EDD#TRPBFHMSE-3.3#PBF
  • LT3973EDD#TRPBFHMSE-3.3#TRPBF
  • LT3973EDD#TRPBFEMSE-5#PBF
  • LT3973EDD#TRPBFEMSE-5#TRPBF
  • LT3973EDD#TRPBFIMSE-5#PBF
  • LT3973EDD#TRPBFIMSE-5#TRPBF
  • LT3973EDD#TRPBFHMSE-5#PBF
  • LT3973EDD#TRPBFHMSE-5#TRPBF

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Minimum Input Voltage 3.8 4.2 V 3
Quiescent Current from VIN 0.75 1.3 µA VEN/UVLO Low 3
Quiescent Current from VIN 1.8 2.8 µA VEN/UVLO High 3
Quiescent Current from VIN 6 µA VEN/UVLO High, –40°C to 125°C 3
LT3973 Feedback Voltage 1.195 1.21 1.225 V 3
LT3973 Feedback Voltage 1.185 1.21 1.235 V 3
LT3973 FB Pin Bias Current 0.1 20 nA VFB = 1.21V 3
FB/Output Voltage Line Regulation 0.0002 0.01 %/V 4.2V < VIN < 40V 3
Switching Frequency 1.72 2.15 2.58 MHz RT = 41.2k, VIN = 6V 3
Switching Frequency 632 790 948 kHz RT = 158k, VIN = 6V 3
Switching Frequency 156 195 234 kHz RT = 768k, VIN = 6V 3
Switch Current Limit 1.237 1.65 1.98 A VIN = 5V, VFB = 0V 3
Catch Schottky Current Limit 0.92 1.15 1.44 A VIN = 5V 3
Switch VCESAT 250 mV ISW = 500mA 3
Switch Leakage Current 0.05 2 µA 3
Catch Schottky Forward Voltage 550 mV ISCH = 200mA, VIN = VBD = NC 3
Catch Schottky Reverse Leakage 0.05 2 µA VSW = 12V 3
Boost Schottky Forward Voltage 820 mV ISCH = 50mA, VIN = NC, VBOOST = 0V 3
Boost Schottky Reverse Leakage 0.02 2 µA VREVERSE = 12V 3
Minimum Boost Voltage 1.4 1.8 V VIN = 5V 3
BOOST Pin Current 10 13 mA ISW = 500mA, VBOOST = 15V 3
Dropout Comparator Threshold (VIN - OUT) 400 490 580 mV Falling, VIN = 5V 3
Dropout Comparator Hysteresis 40 mV 3
EN/UVLO Pin Current 1 30 nA VEN/UVLO = 12V 4
EN/UVLO Voltage Threshold 1.09 1.16 1.23 V EN/UVLO Falling, VIN ≥ 4.2V 4
EN/UVLO Voltage Threshold 1.12 1.19 1.28 V EN/UVLO Rising, VIN ≥ 4.2V 4
EN/UVLO Voltage Hysteresis 30 45 mV 4
PG Threshold Offset from Feedback Voltage 6.5 10 13.5 % VFB Rising 4
PG Hysteresis as % of Output Voltage 0.8 % 4
PG Leakage 0.01 1 µA VPG = 3V 4
PG Sink Current 220 350 µA VPG = 0.4V 4
Minimum Switch On-Time 70 ns 4
Minimum Switch Off-Time 130 180 ns VIN = 10V 4
BOOST Pin Above SW Pin 25 V 2
FB/VOUT, RT, PG Voltage 6 V 2
BD Voltage 25 V 2
Storage Temperature Range -65 150 °C 2
Operating Junction Temperature Range (E grade) -40 125 °C LT3973E 2
Junction-to-Ambient Thermal Resistance (θJA) 40 °C/W DD package (10-lead 3mm × 3mm DFN) 2
Junction-to-Case Thermal Resistance (θJC) 5 °C/W DD package (10-lead 3mm × 3mm DFN) 2

CAD (KiCad official)

  • Symbol: LT3973EDD#TRPBF
  • Footprint: Package_DFN_QFN:DFN-10-1EP_3x3mm_P0.5mm_EP1.55x2.48mm
  • 3D model: DFN-10-EP(3x3) (KiCad packages3D, STEP)
  • 3D model files: lt3973edd-trpbf-etched.step / lt3973edd-trpbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt3973edd-trpbf.step / lt3973edd-trpbf.glb are the bare package body.

Provenance

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

  • Datasheet: Analog Devices datasheet (24 pp, sha256 8b84083bfbac6278, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF