STMicroelectronics ST662ACD

Overview

ST662ACD from STMicroelectronics is a regulated charge pump DC-DC converter designed to generate a stable 12V ±5% output from a 4.5–5.5V input for byte-wide flash memory programming. It delivers up to 30mA output current, features logic-controlled shutdown (1µA quiescent), and requires only ceramic capacitors-no inductor. Its SO-8 package supports surface-mount integration in space-constrained embedded systems.

For engineers reviewing the ST662ACD datasheet, ST662ACD pinout, ST662ACD application, or ST662ACD equivalent, key selection criteria include guaranteed 12V regulation under load, CMOS-compatible active-high shutdown, capacitor-only topology, thermal resistance (20°C/W junction-to-case), and compatibility with flash programming supply rails requiring low-noise, inductor-free 12V generation.

Technical Context

The ST662ACD implements a voltage-tripling charge pump architecture using two external flying capacitors (C1, C2) switched in alternating phases to step up VCC. An internal error amplifier regulates output by disabling the oscillator when VOUT exceeds 12.6V, ensuring tight ±5% tolerance across temperature and load.

Its shutdown function uses an internally pulled-up CMOS input (SHDN): pulling SHDN low enables operation (VOUT = 12V); driving it high disables pumping (VOUT = VCC, ICC ≤ 1µA). Switch impedance is 1–2kΩ, and oscillator frequency is fixed at 400kHz for predictable ripple and layout control.

Key Specifications

Pinout & Package

ST662ACD is housed in an SO-8 (Small Outline-8) package with 1.27mm pitch, 5.0mm width, and 20°C/W junction-to-case thermal resistance-optimized for reflow assembly and moderate power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar regulated charge pump applications.

Compared with MAX680ESA+ and TPS60403DBVR, ST662ACD uniquely combines 12V ±5% regulation, 30mA capability, active-high shutdown, and SO-8 packaging-making it the only drop-in solution for JEDEC-compliant flash programming supply without external compensation or dual-rail overhead.

Availability

ST662ACD is available at Aetrix Electronics and suitable for flash memory programming supplies, embedded bootloader interfaces, and USB-powered programmer dongles requiring stable component supply and long-term industrial availability.

Supply support for ST662ACD 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad analog/mixed-signal portfolio.

The ST662 product line targets inductor-free, low-noise DC-DC conversion for non-volatile memory programming-designed specifically to replace discrete charge pump solutions in space- and cost-sensitive embedded systems.

FAQ

What is the minimum input voltage required for ST662ACD to maintain 12V output at 30mA?

The ST662ACD guarantees 12V ±5% output down to 4.75V input at 30mA load, per Electrical Characteristics table on page 3 of the datasheet. Operation below 4.75V may cause output droop outside specification, especially at elevated temperatures. Input must remain within absolute maximum rating of −0.3V to 6V.

Can ST662ACD drive multiple flash devices simultaneously?

Yes-up to 30mA total output current is supported. Driving multiple flash chips is feasible if their combined VPP current draw remains ≤30mA during programming pulses. Layout must minimize trace inductance and place C3/C4 capacitors within 2mm of pins 5 and 6 to maintain regulation stability under dynamic load.

Is an external feedback resistor network required for voltage adjustment?

No. ST662ACD uses internal fixed-ratio regulation and requires no external resistors. The 12V output is trimmed at wafer test and guaranteed across temperature and process variation. Any attempt to modify output voltage externally will violate the specified operating conditions and void regulation accuracy.

What capacitor types and values are mandatory for stable operation?

Mandatory capacitors: C1/C2 = 0.22µF ceramic (X7R), C3 = 4.7µF tantalum or low-ESR electrolytic, C4 = 4.7µF tantalum, C5 = 0.1µF ceramic. Ceramic C1/C2 ensure fast charge/discharge; low-ESR C3/C4 suppress ripple; C5 provides high-frequency decoupling. Substitutions risk oscillation or output overshoot.