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

uP9509S top mark · 3–26 V VIN.

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 uP9509S-DS-F0000 (July 2018) · pp. 2–5 and Table 1, p. 7

Connection scenarios

Two integrated phases

For a two-phase limit, ground PWM3 directly and leave ISEN3 open.

Each gate driver has its own bootstrap capacitor and current-sense resistor.

Two integrated phasesIntegrated phase 1uP9509Stage 1UGATE1LGATE1BOOT1PHASE1ISEN1Gate HGate LSWCB1RS1Integrated phase 2uP9509Stage 2UGATE2LGATE2BOOT2PHASE2ISEN2Gate HGate LSWCB2RS2Phase selection at power-onPWM3GNDISEN3Open
  • 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
  • Controller ground
  • Leave open

Bench checks

  • Set the straps with power removed. The phase limit is sampled at PVCC power-on reset.
  • Verify both low-side sense paths and separate bootstrap returns before enabling the converter.

uPI uP9509S-DS-F0000 (July 2018) · pp. 2–5 and Table 1, p. 7

VQFN-24 wiring map

External wiring example · Two integrated phases

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

VQFN-24

12 · COMP · Right 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

12 · COMP

Error amplifier output · Outputs

Connect the compensation network sized for the board’s output filter and load.

uPI uP9509S-DS-F0000 (July 2018) · p. 5

Electrical limits · Pin in the reference

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.