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Analog Devices Inc. LTC1262IS8#TRPBF
- Part No.:
- LTC1262IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1262IS8#TRPBF.pdf
- Description:
- IC REG CONV PROG SUP 1OUT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,061
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Product details
Overview
LTC1262IS8#TRPBF from Analog Devices (formerly Linear Technology) is a regulated charge-pump DC/DC converter IC designed specifically to generate 12V ±5% for byte-wide flash memory programming. It delivers guaranteed 30mA output from a 4.75V–5.5V input, requires no inductors, and operates with only four external capacitors. Its TTL-compatible shutdown pin enables microprocessor-controlled power gating in embedded memory systems.
For engineers reviewing the LTC1262IS8#TRPBF datasheet, LTC1262IS8#TRPBF pinout, LTC1262IS8#TRPBF application, or LTC1262IS8#TRPBF equivalent, key selection criteria include output voltage regulation accuracy over temperature, shutdown current <1µA, turn-on time ≤500µs, and SO-8 package compatibility with flash VPP supply routing constraints.
Technical Context
The LTC1262IS8#TRPBF implements a fixed-ratio charge-pump tripler architecture clocked at 300kHz to step up 5V input to 12V output without magnetic components. Regulation is achieved via oscillator pulse gating controlled by a bandgap reference and resistor-divider feedback sensing VOUT.
It features internal switch drivers referenced to VOUT/GND, an integrated startup diode for load-assisted start-up, and a logic-level SHDN pin that disables the oscillator, bandgap, and comparator to reduce ICC to 0.5µA typical. Output voltage remains stable across –40°C to 85°C with ≤±0.2V deviation from 12V at 30mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12V ±5% (11.4V–12.6V) over full –40°C to 85°C range and 0–30mA load - ensures reliable flash cell programming margin. |
| Max Output Current | 30mA guaranteed continuous - sufficient for standard byte-wide NOR/NAND flash VPP programming pulses. |
| Supply Current (Active) | 0.5–1.3mA (typ. 500µA at 25°C) - enables low-quiescent operation in battery-backed systems. |
| Shutdown Current | 0.5µA typical (≤10µA max) - minimizes standby drain in always-on memory subsystems. |
| Oscillator Frequency | 300kHz fixed - determines charge-pump switching speed and ripple frequency for capacitor sizing. |
| Turn-On / Turn-Off Time | 500µs / 3.3ms - defines VPP enable/disable timing window for flash command sequencing. |
| Input Voltage Range | 4.75V to 5.5V - matches standard 5V logic rail with ±5% tolerance, eliminating need for pre-regulation. |
Pinout & Package
Package: 8-lead plastic SO-8 (narrow, 0.150-inch width), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1– (Pin 1) | Charge Pump Capacitor Negative Terminal | Connects to negative plate of 0.22µF ceramic capacitor C1; forms first stage of tripler network. |
| C1+ (Pin 2) | Charge Pump Capacitor Positive Terminal | Connects to positive plate of C1; alternately tied to VCC and stacked during oscillator phase. |
| C2– (Pin 3) | Charge Pump Capacitor Negative Terminal | Connects to negative plate of second 0.22µF ceramic capacitor C2; completes tripler staging. |
| C2+ (Pin 4) | Charge Pump Capacitor Positive Terminal | Connects to positive plate of C2; switched to charge COUT when oscillator high. |
| VCC (Pin 5) | Main Power Input | 4.75V–5.5V supply input; requires 4.7µF bypass capacitor to ground for stability. |
| VOUT (Pin 6) | Regulated 12V Output | Delivers up to 30mA; connects to flash VPP pin; internally shorted to VCC in shutdown mode. |
| GND (Pin 7) | Analog Ground Reference | Common return for all internal circuitry and external capacitors; must be low-impedance. |
| SHDN (Pin 8) | Logic-Controlled Shutdown Input | TTL-compatible; low = active (normal operation); high or floating = shutdown (ICC ≤0.5µA). |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates EMI-sensitive magnetics and simplifies PCB layout for compact flash programming circuits. |
| Guaranteed 30mA output at 12V | Meets JEDEC-standard VPP current requirements for 5V-tolerant byte-wide flash devices. |
| 0.5µA typical shutdown current | Extends battery life in portable programmers and enables seamless integration into low-power MCU sleep modes. |
| 500µs fast turn-on time | Supports tight flash programming timing windows without delaying write/erase cycles. |
| SO-8 package with PDIP pinout compatibility | Enables drop-in replacement in legacy designs using LTC1262CN8 while supporting surface-mount manufacturing. |
Applications
| Flash Memory Programming | Compact Op Amp Bias Supply |
|---|---|
|
Use Scenario: Generating VPP for byte-wide NOR flash (e.g., Intel 28Fxxx, AMD Am29LVxxx) during erase/write operations in industrial controllers. IC Role / Device Role / Timing Role: Dedicated 12V programming supply with precise voltage regulation and microprocessor-gated enable timing. Use Value: Ensures consistent oxide breakdown voltage margin across temperature and process variation, reducing bit errors during field updates. |
Use Scenario: Providing clean ±12V rails for rail-to-rail op amps in portable test equipment where space prohibits inductor-based converters. IC Role / Device Role / Timing Role: High-efficiency, low-noise 12V source for analog signal conditioning stages requiring stable headroom. Use Value: Delivers 30mA at <1% ripple (with recommended 4.7µF tantalum COUT), enabling >90dB PSRR in precision amplifiers. |
| Battery-Powered Programmers | Embedded Bootloader Support |
|
Use Scenario: Handheld flash programmers powered by two AA cells (3V) with boost regulator feeding LTC1262IS8#TRPBF's 5V input rail. IC Role / Device Role / Timing Role: Final-stage 12V generation stage isolated from main system power domain. Use Value: 0.5µA shutdown current extends single-charge battery life to >1 year in storage mode. |
Use Scenario: On-board VPP supply for secure boot firmware update in automotive ECUs with ASIL-B functional safety requirements. IC Role / Device Role / Timing Role: Safety-monitored 12V source activated only during authenticated firmware reflash sequences. Use Value: Fast 500µs turn-on allows bootloader to initiate flash programming within 1ms of command validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory programming supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1301CS8#TRPBF | Higher efficiency (85% vs 74%), 500kHz switching, requires external inductor and Schottky diode. | Supports higher output current (100mA) but increases BOM count and EMI risk in noise-sensitive systems. | Choose LT1301CS8#TRPBF when >30mA load or higher efficiency is required and inductor placement is feasible. |
| LTC1983ES6#TRMPBF | Lower quiescent current (1.5µA shutdown), fixed 12V output, SOT-23-6 package, no external capacitors needed. | Rated for only 20mA output; insufficient for high-VPP-flash requiring full 30mA compliance. | Choose LTC1983ES6#TRMPBF for space-constrained designs with ≤20mA flash VPP loads and ultra-low standby power priority. |
Compared with LT1301CS8#TRPBF and LTC1983ES6#TRMPBF, the LTC1262IS8#TRPBF uniquely balances inductor-free simplicity, guaranteed 30mA delivery, and sub-1µA shutdown current - making it optimal for cost-sensitive, noise-immune flash programming in industrial and automotive control modules.
Availability
LTC1262IS8#TRPBF is available at Aetrix Electronics and suitable for flash memory programming, compact op amp biasing, and battery-powered programmer applications requiring stable component supply, long-lifecycle support, and industrial temperature grade performance.
Supply support for LTC1262IS8#TRPBF 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
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog and power management product lines with full datasheet, reliability, and support continuity.
The LTC1262IS8#TRPBF belongs to Linear's legacy high-reliability DC/DC converter family, engineered specifically for flash memory VPP generation in industrial, telecom, and embedded systems where inductor-free design and guaranteed current delivery are critical.
FAQ
What is the operating temperature range for the LTC1262IS8#TRPBF?
The LTC1262IS8#TRPBF is specified for –40°C to +85°C ambient operation, matching the Industrial temperature grade (denoted by the "I" suffix). This ensures reliable 12V ±5% output and 30mA current delivery across extended environmental conditions encountered in factory automation and outdoor electronics. The SO-8 package has θJA = 150°C/W, requiring minimal heatsinking under full load.
Can the LTC1262IS8#TRPBF drive multiple flash devices simultaneously?
Yes - the LTC1262IS8#TRPBF can drive multiple flash devices if their combined VPP current demand stays within 30mA. For higher loads, two LTC1262IS8#TRPBF units may be paralleled (as shown in Figure TA03), maintaining regulation via shared C1/C2 and independent COUT capacitors. Total output current scales linearly, but ensure matched PCB layout to avoid current imbalance.
What capacitor types are recommended for C1 and C2 in the LTC1262IS8#TRPBF circuit?
The LTC1262IS8#TRPBF requires 0.22µF ceramic capacitors for C1 and C2, as specified in the datasheet and validated in Figure 2. Ceramic capacitors provide low ESR and stable capacitance over temperature and voltage - essential for efficient charge transfer in the tripler topology. Tantalum or aluminum electrolytics are not recommended for C1/C2 due to higher ESR, which degrades regulation and increases ripple above 25mA load.
Does the LTC1262IS8#TRPBF require a minimum load to maintain regulation?
No - the LTC1262IS8#TRPBF maintains 12V ±5% regulation from 0mA to 30mA output current, as confirmed in the Electrical Characteristics table (VOUT min/max tested at 0mA ≤ IOUT ≤ 30mA). Unlike some switching regulators, it does not require a minimum load resistor; regulation is maintained open-circuit, simplifying design for intermittent flash programming use cases.
How does the SHDN pin behavior affect VOUT during shutdown?
When the SHDN pin is high or floating, the LTC1262IS8#TRPBF enters shutdown mode: the oscillator, bandgap, and comparator disable, reducing ICC to ≤0.5µA, and an internal switch connects VOUT directly to VCC. As a result, VOUT decays from 12V to VCC (typically 5V) in 3.3ms (tOFF), ensuring safe flash device reset before power removal.
LTC1262IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, Programming Supply
- Voltage - Input:
- 4.75V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 12V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1262IS8#TRPBF FAQ
1.How can I place an order for LTC1262IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1262IS8#TRPBF 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 LTC1262IS8#TRPBF reliable?
The price and inventory of LTC1262IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1262IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1262IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1262IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1262IS8#TRPBF?
LTC1262IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1262IS8#TRPBF 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 LTC1262IS8#TRPBF?
For technical support, including LTC1262IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1262IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1262IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1262IS8#TRPBF 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 LTC1262IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1262IS8#TRPBF?
All LTC1262IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1262IS8#TRPBF, 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 LTC1262IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1262IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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