STMicroelectronics STOD1812PUR

Overview

STOD1812PUR from STMicroelectronics is a synchronous step-up DC-DC converter IC designed specifically to supply pre-charge and bias voltage for passive matrix OLED (PMOLED) display column drivers. It operates with 2.5–5.5 V input, delivers up to 20 V adjustable output, supports 120 mA max load current, achieves 85% peak efficiency, and integrates true load disconnect via EN-controlled switch.

For engineers reviewing the STOD1812PUR datasheet, STOD1812PUR pinout, STOD1812PUR application, or STOD1812PUR equivalent, key selection criteria include PFM control mode for light-load efficiency, integrated synchronous rectification eliminating external Schottky diodes, soft-start and UVLO protection, thermal shutdown at 150 °C, and DFN10L 3×3 mm package suitability for space-constrained portable displays.

Technical Context

The STOD1812PUR implements pulsed frequency modulation (PFM) control to maintain high efficiency across wide load ranges (5–120 mA), with internal compensation enabling fast load transient response and stable regulation. Its dual MOSFET power stage features 0.60 Ω P-channel and 0.25 Ω N-channel R_DS(on), supporting 1.2 MHz typical switching frequency and 95% maximum duty cycle.

Feedback is sensed at the FB pin with 1.21 V nominal reference; output voltage is set externally via resistor divider (e.g., 270 kΩ/20 kΩ for 18 V). The EN pin provides logic-level shutdown (<0.4 V low), reducing quiescent current to 100 nA, while the exposed thermal pad (Exp Pad) connects directly to PGND for junction-to-ambient thermal resistance of 30.9 °C/W.

Key Specifications

Pinout & Package

STOD1812PUR is housed in a thermally enhanced DFN10L (3 × 3 mm, 0.8 mm height) package with an exposed power pad (Exp Pad) requiring direct connection to PGND for optimal thermal performance and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PMOLED boost converter applications.

Compared with MAX17065ETA+ and TPS61042DRVR, STOD1812PUR uniquely combines adjustable output, true load disconnect, and sub-100 nA shutdown current in a 3×3 mm DFN-making it optimal for ultra-low-power, space-constrained PMOLED applications where display bias must be tightly managed.

Availability

STOD1812PUR is available at Aetrix Electronics and suitable for PMOLED display power supplies, mobile phone main displays, and digital still camera viewfinders requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STOD1812PUR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The STOD1812 belongs to ST's dedicated display power management product line, engineered specifically for efficient, compact, and reliable bias generation in passive matrix OLED systems.

FAQ

What is the minimum input voltage required for STOD1812PUR to start switching?

The STOD1812PUR incorporates an under-voltage lockout (UVLO) with a typical turn-on threshold of 2.4 V and hysteresis of 0.2 V. It will not initiate switching until the VI pin rises above 2.4 V, and remains active down to ~2.2 V before disabling. This ensures stable startup from partially discharged batteries.

Can STOD1812PUR drive a 20 V output at full 120 mA load continuously?

Yes-STOD1812PUR supports 20 V output at 120 mA under TJ ≤125 °C, provided PCB thermal design maintains junction temperature within limit. With R_thJA = 30.9 °C/W and 85% efficiency at 120 mA, power dissipation is ~215 mW, resulting in ~6.6 °C rise above ambient-well within safe operating range on standard 2-layer boards.

How does the true load disconnect function operate during shutdown?

When EN is pulled ≤0.4 V, STOD1812PUR disables both power switches and activates an internal isolation MOSFET between OUT and VI. This breaks the DC path, reducing reverse leakage current to <10 nA and preventing battery discharge through the PMOLED panel's parasitic capacitance or forward-biased OLED pixels.

Is an external compensation network required for stable operation?

No-STOD1812PUR integrates full Type-II compensation internally. Stability is guaranteed with the recommended 2.2 µH inductor and 4.7 µF input/output ceramic capacitors. No external RC network is needed, simplifying layout and reducing component count versus controllers requiring external compensation.