Spark Logic

uP9509P / uP9509S connection guide

uP9509P / uP9509S (VQFN-24) connection guide. Controller power and ground. One integrated phase.

VQFN-24

25 contacts Current package

uPI Semiconductor · 4 × 4 mm · 24 edge contacts and exposed ground pad

Controller power and ground

Required

Apply a regulated 5 V bias supply to PVCC and solder the exposed GND pad to the ground plane. VIN is the separate feed for the MOSFET power stage.

Place ceramic capacitors close to PVCC and VREF. Keep EN low during initial bias checks and follow the board’s power sequence.

Controller power and grounduP9509PVCCVREFGND (EP)5 V bias2 V outC1 ≥1 µFC2 ≥1 µF
  • PVCC · 5 V
    • 5 V bias rail
    • C1.1
  • Controller ground
    • Bias supply return
    • C1.2
    • C2.2
  • VREF · 2 V output
    • C2.1

Bench checks

  • Check continuity from the exposed pad to board ground before applying power.
  • Measure PVCC at the controller. Its operating range is 4.5–5.5 V and its rising reset threshold is typically 4.1 V.

uPI uP9509-DS-C3000 (December 2015) · pp. 2–5

Connection scenarios

Two integrated phases plus an external driver

Use both integrated drivers and connect PWM3 to the companion driver’s compatible PWM input. The external driver needs its own gate drive, bootstrap and supply connections.

Route the third stage’s switch node through 500 Ω to ISEN3.

Two integrated phases plus an external driverIntegrated phase 1uP9509Stage 1UGATE1LGATE1BOOT1PHASE1ISEN1Gate HGate LSWCB1RS1Integrated phase 2uP9509Stage 2UGATE2LGATE2BOOT2PHASE2ISEN2Gate HGate LSWCB2RS2External phase 3uP9509Ext. stagePWM3Driver PWMISEN3Switch node500 Ω
  • BOOT1
    • CB1.1
  • PHASE1
    • CB1.2
    • MOSFET switch node 1
    • Sense resistor 1.1
    • Inductor 1 input
  • High-side gate 1
    • High-side MOSFET gate 1
  • Low-side gate 1
    • Low-side MOSFET gate 1
  • Current sense 1
    • Sense resistor 1.2
  • BOOT2
    • CB2.1
  • PHASE2
    • CB2.2
    • MOSFET switch node 2
    • Sense resistor 2.1
    • Inductor 2 input
  • High-side gate 2
    • High-side MOSFET gate 2
  • Low-side gate 2
    • Low-side MOSFET gate 2
  • Current sense 2
    • Sense resistor 2.2
  • PWM3 drive
    • External driver PWM input
  • External PHASE3
    • External driver switch node
    • R3.1
  • Third phase sense
    • R3.2

Bench checks

  • Verify the external driver’s input and disable behavior against its own datasheet.
  • Keep PWM3 free of the phase-disable strap. Confirm the exact sense resistor for the installed P or S variant.

uPI uP9509-DS-C3000 (December 2015) · pp. 2–5

VQFN-24 wiring map

External wiring example · Two integrated phases plus an external driver

Highlighted contacts are used in the required step or selected circuit. Select a contact to highlight its wiring nets.

VQFN-24

19 · PHASE2 · Left side, contact 1 from the top

Marking-side view as drawn in the pin configuration. Pin 1 is at the left end of the bottom edge.
Selected pin details

19 · PHASE2

Switch-node reference · Bidirectional

Connect to the phase 2 switch node and the return of its bootstrap capacitor.

uPI uP9509-DS-C3000 (December 2015) · p. 3

Connected nets

Electrical limits · Pin in the reference

  • PHASE2
    • CB2.2
    • MOSFET switch node 2
    • Sense resistor 2.1
    • Inductor 2 input
    • Via CB2 · board value to BOOT2 · BOOT2 (18), CB2.1

Models and documents

The two order codes use the same contact positions. The reference opens with P specifications. Select S to see its VIN range, phase straps and third-stage sense resistor. PGF860 is part of the supplied chip marking. The ordering table identifies the device by uP9509P.

uP9509PQAG
uP9509P top mark · 4.5–26 V VIN.
uP9509SQAG
uP9509S top mark · 3–26 V VIN.