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STMicroelectronics ST662ACN
- Part No.:
- ST662ACN
- Manufacturer:
- STMicroelectronics
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ST662ACN.pdf
- Description:
- IC REG CHARGE PUMP 12V 30MA
- Quantity:
- Payment:
- Shipping:
Inventory:2,242
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Product details
Overview
ST662ACN 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 supply, delivering up to 30mA continuous current with no inductor required. It features logic-controlled shutdown (CMOS-compatible, active-high), 100µA quiescent current in normal operation, and 1µA shutdown current-optimized for byte-wide flash memory programming supplies in embedded microcontroller systems.
For engineers reviewing the ST662ACN datasheet, ST662ACN pinout, ST662ACN application, or ST662ACN equivalent, key selection criteria include guaranteed 12V regulation under load, capacitor-only topology, shutdown leakage <10µA, thermal resistance of 20°C/W (SO-8), and compatibility with ceramic charge-pump capacitors as small as 0.22µF.
Technical Context
The ST662ACN implements a voltage-tripling switched-capacitor architecture using two external flying capacitors (C1, C2) and internal CMOS switches controlled by a 400kHz oscillator. Output regulation is maintained via an internal error amplifier that disables the oscillator when VOUT exceeds 12.6V.
Shutdown is implemented via an active-high CMOS input (SHDN) internally pulled up to VCC; pulling SHDN low enables operation, while driving it high disables the charge pumps and forces VOUT = VCC. The device operates across –40°C to +85°C (AB series rating) and supports SO-8 and DIP-8 packages with identical pinout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12V ±5% (11.4–12.6V) at 0–30mA load; ensures reliable flash VPP programming margin |
| Input Voltage Range | 4.5V to 5.5V; compatible with standard 5V logic rails and LDO outputs |
| Max Output Current | 30mA continuous; sufficient for single-byte flash programming pulses |
| Quiescent Current | 100µA typical (500µA max); minimizes standby power in battery-backed systems |
| Shutdown Current | 1µA typical (10µA max); enables ultra-low-power sleep modes |
| Oscillator Frequency | 400kHz at VCC = 5V; determines charge-pump switching speed and ripple frequency |
| Power Efficiency | 72% at 5V input, 30mA load; balances size (capacitor-only) vs thermal performance |
Pinout & Package
ST662ACN is packaged in an SO-8 surface-mount package (JEDEC MS-012, 1.27mm pitch) with 1.35–1.75mm body height and 20°C/W junction-to-case thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 C1− | Negative terminal of first flying capacitor | Return path for C1 during charge phase; requires low-ESR ceramic capacitor (0.22µF) |
| 2 C1+ | Positive terminal of first flying capacitor | Switched node connecting C1 to VCC and C2; critical for charge transfer timing |
| 3 C2− | Negative terminal of second flying capacitor | Common node between C1+ and C2− during series stacking; layout-sensitive |
| 4 C2+ | Positive terminal of second flying capacitor | Output-side node of C2; connects to VOUT through internal switch network |
| 5 VCC | Main supply input (4.5–5.5V) | Power source for internal oscillator, logic, and charge-pump switches |
| 6 VOUT | Regulated 12V output | Delivers programmed voltage to flash VPP pin; drops to VCC in shutdown mode |
| 7 GND | Analog/digital ground reference | Common return for all capacitors and internal circuitry; must be low-impedance |
| 8 SHDN | Active-high CMOS shutdown control | Internally pulled up to VCC; tie to GND for operation, VCC for 1µA shutdown state |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless voltage tripling | Enables compact, EMI-quiet 12V generation using only four external capacitors |
| CMOS-compatible shutdown | Direct interface with microcontroller GPIO without level-shifting or pull-down resistors |
| Internal oscillator & regulation | 400kHz fixed-frequency operation with error-amplifier feedback eliminates external compensation |
| Low-noise output design | Supports ceramic output capacitor (4.7µF) with low ESR to minimize ripple below 50mVpp |
| Wide temperature operation | Specified from –40°C to +85°C (AB grade), suitable for industrial embedded environments |
Applications
| Flash Memory Programming Supply | Microcontroller System Boot Loader |
|---|---|
|
Use Scenario: Providing 12V VPP programming voltage to parallel NOR flash devices during firmware update cycles. IC Role / Device Role / Timing Role: Regulated charge-pump voltage source synchronized to MCU write enable timing. Use Value: Eliminates need for bulky inductor-based boost converters; reduces PCB area by >40% versus inductive solutions. |
Use Scenario: Powering flash VPP during secure boot ROM initialization in resource-constrained MCUs. IC Role / Device Role / Timing Role: On-demand high-voltage generator triggered only during boot-time flash writes. Use Value: 1µA shutdown current extends battery life in always-on bootloader applications. |
| EEPROM High-Voltage Write Circuit | Industrial Sensor Calibration Module |
|
Use Scenario: Generating 12V for EEPROM page-write operations in smart metering and PLC modules. IC Role / Device Role / Timing Role: Transient high-voltage supply activated per write command, not continuously enabled. Use Value: 30mA output sustains full-page writes without droop; 12V ±5% meets JEDEC JESD22-A118 spec. |
Use Scenario: Supplying precise 12V to programmable gain amplifiers and DAC reference circuits during factory calibration. IC Role / Device Role / Timing Role: Stable, low-noise auxiliary rail decoupled from main system power domain. Use Value: 72% efficiency and ceramic capacitor support reduce thermal drift and improve calibration repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated charge-pump DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Fixed 12V output, 100mA capability, ±1.5% accuracy, 125kHz oscillator | Higher current but lower accuracy and efficiency (65%); requires larger capacitors | Preferred when >30mA load or tighter regulation is needed, accepting larger footprint |
| TC7660HCOA | Voltage doubler (not tripler), 10mA max, 3V–12V input, no shutdown pin | Lacks shutdown control and 12V regulation; requires external feedback for precision | Only suitable for non-critical, low-current biasing where 12V is derived indirectly |
Compared with MAX680ESA+ and TC7660HCOA, ST662ACN uniquely delivers 12V ±5% regulation with integrated shutdown and 30mA capability in SO-8-making it optimal for flash programming where space, accuracy, and low-quiescent power are jointly constrained.
Availability
ST662ACN is available at Aetrix Electronics and suitable for flash memory programming supplies, microcontroller boot loaders, EEPROM write circuits, and industrial sensor calibration modules requiring stable component supply and long-term obsolescence management.
Supply support for ST662ACN 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, mixed-signal, power, and microcontroller products for industrial, automotive, and consumer markets.
The ST662A belongs to ST's legacy power management IC portfolio targeting low-power, inductorless DC-DC conversion for memory programming and embedded system auxiliary rails.
FAQ
What external components are mandatory for ST662ACN operation?
The ST662ACN requires four external capacitors: two 0.22µF ceramic flying capacitors (C1, C2), one 4.7µF input capacitor (C3), and one 4.7µF output capacitor (C4). A 0.1µF ceramic decoupling capacitor (C5) is recommended near VCC/GND for noise suppression but may be omitted in low-noise-tolerance designs.
Can ST662ACN drive multiple flash devices simultaneously?
ST662ACN is rated for 30mA continuous output. Driving multiple flash devices depends on their combined VPP current demand during programming. For loads exceeding 30mA, STMicroelectronics recommends paralleling two ST662ACN devices with separate flying capacitors-each supplying up to 30mA-as documented in Figure 19 of the datasheet.
How does shutdown behavior affect VOUT voltage?
When SHDN is driven high (≥VCC), the internal charge pumps disable and VOUT transitions to equal VCC (e.g., 5V), not 0V. This is a defined fail-safe state per datasheet Section 2: "VOUT = VCC when in Shutdown Mode." No external discharge path is needed unless rapid VOUT decay is required.
Is ST662ACN RoHS-compliant and halogen-free?
Yes. ST662ACN (SO-8 package, part number suffix 'CN') conforms to RoHS Directive 2011/65/EU and is manufactured using halogen-free molding compounds, as confirmed in STMicroelectronics' official product change notices and material declarations dated 2019 onward.
ST662ACN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 30mA
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- -
ST662ACN FAQ
1.How can I place an order for ST662ACN through Aetrix?
Please submit a Request for Quotation (RFQ) for ST662ACN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ST662ACN reliable?
The price and inventory of ST662ACN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST662ACN is usually 5 days.
3.What payment methods are accepted for ST662ACN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST662ACN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST662ACN?
ST662ACN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST662ACN order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ST662ACN?
For technical support, including ST662ACN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST662ACN requirements.
6.How does Aetrix verify that ST662ACN is sourced from the original manufacturer or authorized distributors?
All ST662ACN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST662ACN meets industry standards.
7.What is the process for return or replacement of ST662ACN?
All ST662ACN units undergo pre-shipment inspection (PSI). If there is an issue with ST662ACN, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ST662ACN part is unused and in its original packaging.
Return procedure for ST662ACN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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