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LT8609AIMSE#PBF

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

componentpower management (pmic)lt8609aimse#pbf
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lt8609aimse-pbf-etched.fit.json lt8609aimse-pbf: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
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page.json lt8609aimse-pbf: specified limits as data (metadata.characteristics, 34 rows from the datasheet) · Ray 25d ago
README.md lt8609aimse-pbf: specified limits as data (metadata.characteristics, 34 rows from the datasheet) · Ray 25d ago

LT8609AIMSE#PBF

Analog Devices · DC-DC Converters · MSOP-10-EP

LT8609AIMSE#PBF from Analog Devices, in a MSOP-10-EP. 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 BST passive Bootstrap capacitor pin providing the drive voltage (above VIN) for the internal top-side power NMOS switch. Place a 0.1µF ceramic capacitor from BST to SW as close to the IC as possible; do not place a series resistor.
2 SW power_out Switch node - output of the internal top-side and synchronous bottom-side power MOSFETs. Connect to the external inductor and to the bootstrap capacitor. Keep this node small on the PCB for good EMI/thermal performance.
3 INTVCC power_out Internal 3.5V LDO regulator bypass pin that supplies the internal gate drivers and control circuits. Voltage varies from 2.8V to 3.5V; max output 20mA. Decouple to GND with at least a 1µF low-ESR ceramic capacitor. Do not load with external circuitry.
4 RT input Oscillator frequency-set pin. Tie a resistor from RT to GND to program the switching frequency between 200kHz (RT = 221kΩ) and 2.2MHz (RT = 16.2kΩ).
5 SYNC input External clock synchronization / mode-select input. Tie to GND for low-ripple Burst Mode; drive with an external clock (200kHz-2.2MHz) to synchronize; leave floating for pulse-skipping mode; tie to INTVCC or 3.2V-5.0V for pulse-skipping mode with spread-spectrum modulation.
6 FB input Feedback input for the adjustable-output LT8609A. Regulated to 0.782V. Connect to the tap of the external VOUT-to-GND resistor divider that programs the output voltage. Add a ~10pF phase-lead capacitor from VOUT to FB when using large divider resistors.
7 TR/SS input Output tracking and soft-start pin. An internal 2µA pull-up from INTVCC charges an external capacitor to program the output-voltage slew rate. Below 0.782V the part regulates FB to the TR/SS voltage; above 0.782V tracking is disabled. Pulled to GND through a 300Ω MOSFET in shutdown and fault conditions.
8 PG output Power-good open-drain output. Held low until FB is within ±8.5% of the regulation setpoint and no fault is present. Absolute max 42V; valid when VIN > 3.2V regardless of EN/UV state. Requires an external pull-up resistor.
9 VIN power_in Main input supply pin, 3.0V to 42V. Supplies internal control circuitry and the internal top-side power switch. Locally bypass with a low-ESR ceramic capacitor placed close to VIN and the exposed-pad GND.
10 EN/UV input Enable / input under-voltage lockout pin. Rising threshold 1.05V, falling 1.00V. Ground to shut the part down (IQ ≈ 1µA); tie to VIN if shutdown/UVLO is not used, or use an external VIN divider to program a precise VIN turn-on threshold. Absolute max 42V.
11 GND power_in Exposed thermal pad - signal and power ground return. Must be soldered directly to the PCB ground plane both for the electrical return path and to achieve the specified θJA = 40°C/W thermal resistance.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LT8609AIMSE#PBFEMSE
  • LT8609AIMSE#PBF
  • LT8609AIMSE#PBFHMSE
  • LT8609AIMSE#PBFJMSE
  • LT8609AIMSE#PBFEMSE16
  • LT8609AIMSE16
  • LT8609AIMSE#PBFHMSE16
  • LT8609AIMSE#PBFJMSE16
  • LT8609AIMSE#PBFEDDM
  • LT8609AIMSE#PBFJDDM
  • LT8609AIMSE#PBFHDDM
  • LT8609AIMSE#PBFEDDM-3.3
  • LT8609AIMSE#PBFJDDM-3.3
  • LT8609AIMSE#PBFEDDM-5
  • LT8609AIMSE#PBFJDDM-5
  • LT8609AIMSE#PBFHDDM-5

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
FB, TR/SS pin voltage (absolute maximum) 4 V 2
SYNC pin voltage (absolute maximum) 6 V 2
Storage temperature range -65 150 °C 2
Operating junction temperature range (LT8609AI grade) TJ -40 125 °C LT8609AI (MSE package, I grade) 2
Input voltage range (headline) VIN 3 42 V Stated in Features section, not in a table 1
Thermal resistance, junction to ambient (MSE package) θJA 40 °C/W 10-lead MSOP (MSE package) 2
Minimum Input Voltage 2.7 3 3.2 V 4
VIN Quiescent Current (not switching, EN/UV low) 1 4 µA VEN/UV = 0V, VSYNC = 0V 4
VIN Quiescent Current (not switching, EN/UV high) 1.7 12 µA VEN/UV = 2V, Not Switching, VSYNC = 0V 4
VIN Current in Regulation (100µA load) 46 90 µA VIN = 6V, VOUT = 2.7V, Output Load = 100μA 4
VIN Current in Regulation (1mA load) 480 700 µA VIN = 6V, VOUT = 2.7V, Output Load = 1mA 4
Feedback Reference Voltage (E-, I-, H-Grade) 0.778 0.782 0.786 V VIN = 6V, ILOAD = 100mA 4
Feedback Reference Voltage (E-, I-, H-Grade, over temperature) 0.77 0.782 0.794 V VIN = 6V, ILOAD = 100mA 4
Feedback Voltage Line Regulation 0.004 0.02 %/V VIN = 4.0V to 40V 4
Feedback Pin Input Current -20 20 nA VFB = 1.0V 4
Minimum On-Time 45 75 ns ILOAD = 1.5A, SYNC = 0V 4
Minimum On-Time 45 60 ns ILOAD = 1.5A, SYNC = 1.9V 4
Minimum Off Time 90 130 ns 4
Oscillator Frequency RT 155 200 245 kHz RT = 221k, ILOAD = 0.5A 5
Oscillator Frequency RT 640 700 760 kHz RT = 60.4k, ILOAD = 0.5A 5
Oscillator Frequency RT 1.925 2 2.075 MHz RT = 18.2k, ILOAD = 0.5A 5
Top Power NMOS Current Limit 3.4 4.5 5.7 A 5
SW Leakage Current 15 µA VIN = 42V, VSW = 40V 5
EN/UV Pin Threshold (rising) 0.99 1.05 1.11 V EN/UV Rising 5
EN/UV Pin Current (LT8609/LT8609A) -20 20 nA VEN/UV = 2V 5
PG Upper Threshold Offset from VFB (LT8609/LT8609A) 5 8.5 13 % VFB Rising 5
PG Lower Threshold Offset from VFB (LT8609/LT8609A) 5 8.5 13 % VFB Falling 5
PG Leakage Current VPG -200 200 nA VPG = 42V 5
PG Pull-Down Resistance 550 1200 Ω VPG = 0.1V 5
Sync Low Input Voltage (LT8609/LT8609A) 0.4 0.9 V 5
Sync High Input Voltage (LT8609/LT8609A) 2.7 3.2 V INTVCC = 3.5V 5
TR/SS Source Current 1 2 3 µA 5
TR/SS Pull-Down Resistance 300 900 Ω Fault Condition, TR/SS = 0.1V 5
Spread Spectrum Modulation Frequency (LT8609/LT8609A) VSYNC 1 3 6 kHz VSYNC = 3.3V 5

CAD (KiCad official)

  • Symbol: LT8609AIMSE#PBF
  • Footprint: Package_SO:MSOP-10-1EP_3x3mm_P0.5mm_EP1.68x1.88mm
  • 3D model: MSOP-10-EP (KiCad packages3D, STEP)
  • 3D model files: lt8609aimse-pbf-etched.step / lt8609aimse-pbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt8609aimse-pbf.step / lt8609aimse-pbf.glb are the bare package body.

Provenance

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

  • Datasheet: Analog Devices datasheet (30 pp, sha256 bb514bf594e97238, 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