# FAN48610BUC33X

**onsemi** · DC-DC Converters · WLCSP-9(1.2x1.2)

FAN48610BUC33X from onsemi, in a WLCSP-9(1.2x1.2). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| A1 | VOUT | power_out | Output voltage terminal; connect directly to COUT. |
| A2 | VOUT | power_out | Output voltage terminal; connect directly to COUT. |
| A3 | VIN | power_in | Input voltage; connect to Li-Ion battery input power source, also the bias supply for the gate drivers (2.5 V to 4.8 V recommended). |
| B1 | SW | passive | Switching node; connect to inductor. |
| B2 | SW | passive | Switching node; connect to inductor. |
| B3 | EN | input | Enable; the circuit is enabled when this pin is HIGH (VIH min 1.05 V, VIL max 0.4 V). |
| C1 | PGND | power_in | Power ground, the power return for the IC; return COUT with the shortest path possible to these pins. |
| C2 | PGND | power_in | Power ground, the power return for the IC; return COUT with the shortest path possible to these pins. |
| C3 | AGND | power_in | Analog ground, the signal ground reference for the IC; connect to PGND at a single point. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | WLCSP-9(1.2x1.2) |
| Category | Power Supply Chip |
| Pins | 9 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Voltage on VIN Pin | VIN | -0.3 |  | 6 | V |  | 3 |
| Voltage on VOUT Pin | VOUT |  |  | 6 | V |  | 3 |
| SW Node DC | SW | -0.3 |  | 6 | V | DC | 3 |
| SW Node Transient | SW | -1 |  | 8 | V | Transient: 10 ns, 3 MHz | 3 |
| Voltage on Other Pins | VCC | -0.3 |  | 6 | V | Lesser of 6.0 V or VIN + 0.3 V | 3 |
| ESD Human Body Model | ESD |  |  | 2 | kV | JESD22-A114 | 3 |
| ESD Charged Device Model | ESD |  |  | 1 | kV | JESD22-C101 | 3 |
| Junction Temperature | TJ | -40 |  | 150 | °C |  | 3 |
| Storage Temperature | TSTG | -65 |  | 150 | °C |  | 3 |
| Lead Soldering Temperature | TL |  |  | 260 | °C | 10 Seconds | 3 |
| Supply Voltage | VIN | 2.5 |  | 4.8 | V |  | 4 |
| Maximum Output Current | IOUT |  |  | 1000 | mA |  | 4 |
| Ambient Temperature | TA | -40 |  | 85 | °C |  | 4 |
| Junction Temperature | TJ | -40 |  | 125 | °C |  | 4 |
| VIN Quiescent Current | IQ |  | 85 | 125 | uA | VIN = 3.6 V, IOUT = 0 A, EN = VIN | 4 |
| Shutdown Current | IQ |  | 3 | 10 | uA | Shutdown: EN = 0, VIN = 3.6 V | 4 |
| Under-Voltage Lockout | VUVLO |  | 2.2 | 2.3 | V | VIN Rising | 4 |
| Under-Voltage Lockout Hysteresis | VUVLO_HYS |  | 150 |  | mV |  | 4 |
| Enable HIGH Voltage | VIH | 1.05 |  |  | V |  | 4 |
| Enable LOW Voltage | VIL |  |  | 0.4 | V |  | 4 |
| Current Sink Pull-Down | IPD |  | 100 |  | nA | EN Pin, Logic HIGH | 4 |
| Low-State Active Pull-Down | RLOW | 200 | 300 | 400 | kOhm | EN Pin, Logic LOW | 4 |
| Output Voltage Accuracy DC | VREG | -2 |  | 4 | % | Referred to VOUT, 2.5 V ≤ VIN ≤ VOUT −150 mV | 4 |
| VIN-to-VOUT Leakage Current | ILK_OUT |  |  | 1 | uA | VOUT = 0, EN = 0, VIN = 4.2 V | 4 |
| VOUT-to-VIN Reverse Leakage Current | ILK |  |  | 3.5 | uA | VOUT = 5.0 V, EN = 0, VIN = 2.5 V | 4 |
| Output Voltage Accuracy Transient | VTRSP | -5 |  | 5 | % | Referred to VOUT, 50−500 mA Load Step | 4 |
| Switching Frequency | fSW | 2 | 2.5 | 3 | MHz | VIN = 3.6 V, VOUT = 5.0 V, Load = 1000 mA | 4 |
| Soft-Start EN HIGH to Regulation | tSS |  | 600 |  | us | 50 Ω Load, VOUT = 5.0 V | 4 |
| FAULT Restart Timer | tRST |  | 20 |  | ms |  | 4 |
| N-Channel Boost Switch RDS(ON) | RDS(ON)N |  | 80 | 130 | mOhm | VIN = 3.6 V, VOUT = 5.0 V | 5 |
| P-Channel Sync. Rectifier RDS(ON) | RDS(ON)P |  | 65 | 115 | mOhm | VIN = 3.6 V, VOUT = 5.0 V | 5 |
| Boost Valley Current Limit | IV_LIM | 3 |  | 3.85 | A | VOUT = 5.0 V | 5 |
| Boost Soft-Start Valley Current Limit | IV_LIM_SS |  | 1.7 |  | A | VIN < VOUT < VOUT_TARGET, SS Mode | 5 |
| Minimum VIN for 1000 mA Load | VMIN_1.0A |  | 2.5 |  | V | VOUT = 5.0 V | 5 |
| Minimum VIN for 1500 mA Load | VMIN_1.5A |  | 3 |  | V | VOUT = 5.0 V | 5 |
| Over-Temperature Protection | T150T |  | 150 |  | °C |  | 5 |
| OTP Hysteresis | T150H |  | 20 |  | °C |  | 5 |
| Junction-to-Ambient Thermal Resistance | θJA |  | 50 |  | °C/W | four-layer 2s2p boards, JESD51 | 4 |

## CAD (KiCad official)

- Symbol: `FAN48610BUC33X`
- Footprint: `Package_CSP:WLCSP-9_1.21x1.22mm_Layout3x3_P0.4mm`
- 3D model: WLCSP-9(1.2x1.2) (KiCad packages3D, STEP)
- 3D model files: `fan48610buc33x-etched.step` / `fan48610buc33x-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fan48610buc33x.step` / `fan48610buc33x.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/fan48610buc33x-d.pdf) (13 pp, sha256 `3a456ce8498c8ccd`, retrieved 2026-10-24, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/fan48610buc33x-datasheet.pdf)