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Analog Devices Inc. LTC1502CS8-3.3#TRPBF
- Part No.:
- LTC1502CS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1502CS8-3.3#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 10MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,796
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Product details
Overview
LTC1502CS8-3.3 from Analog Devices (formerly Linear Technology) is a regulated quadrupler charge pump DC/DC converter designed to generate a stable 3.3V ±4% output from a single alkaline or NiCd cell (0.9V–1.8V input). It delivers up to 10mA output current, features 40µA operating current and 5µA shutdown current, and requires no inductors-only five external capacitors. It is used in space-constrained, battery-powered medical and portable instrumentation.
For engineers reviewing the LTC1502CS8-3.3 datasheet, LTC1502CS8-3.3 pinout, LTC1502CS8-3.3 application, or LTC1502CS8-3.3 equivalent, key selection criteria include guaranteed 0.9V start-up, shutdown-controlled load disconnection, short-circuit protection, compact PCB footprint (<0.125in²), and MSOP-8 package compatibility with low ESR capacitor requirements.
Technical Context
The LTC1502CS8-3.3 implements a two-stage cascaded voltage doubler architecture: CP1 doubles VIN to charge C2, then CP2 doubles the C2 voltage to produce VOUT. Regulation is achieved via a hysteretic comparator (COMP1) that disables the 500kHz oscillator when VOUT exceeds 3.43V and re-enables it when VOUT drops below 3.17V.
Enhanced start-up uses COMP2 to monitor the divided C2 voltage versus VIN, forcing CP2 into high-impedance until C2 rises above VIN-enabling reliable operation at 0.9V input with load. Shutdown is edge-sampled every 16 clock cycles; pulling C1–/SHDN below 0.55V triggers oscillator halt and internal switch isolation between VIN and VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±4% (3.17V–3.43V); tightly regulated for logic-level microcontroller supply rails |
| Input Voltage Range | 0.9V to 1.8V; supports full discharge curve of single alkaline/NiCd cells |
| Start-Up Voltage | Guaranteed 0.9V at 0°C–70°C; enables operation even as battery depletes |
| Output Current | 10mA at VIN ≥ 1V; sufficient for low-power sensors, LCD bias, and backup memory |
| Operating Current | 40µA typical; extends AA-cell battery life beyond 10,000 hours at 10µA average load |
| Shutdown Current | 5µA max; ensures minimal drain during system sleep modes |
| Switching Frequency | 500kHz free-running; enables use of small 0.47–2.2µF ceramic flying capacitors |
| Output Ripple | 50mVP-P at 10mA/1.25VIN; manageable with 10µF low-ESR tantalum + 1µF ceramic parallel output filter |
Pinout & Package
Package: 8-pin MSOP (MS8), 3.0mm × 3.0mm body, 0.65mm pitch, RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C2 | CP1 Output / CP2 Input | Intermediate 2×VIN node; must remain unloaded during start-up; bypassed with ≥10µF low-ESR capacitor |
| C1+ | CP1 Flying Capacitor Positive | Connects to positive terminal of C1 (0.47–2.2µF ceramic); switched at 500kHz |
| C1–/SHDN | CP1 Flying Capacitor Negative & Shutdown Control | Logic input: <0.55V = shutdown; internal pull-up returns to active mode when released |
| GND | Analog Ground Reference | Must connect to low-impedance ground plane; shared return for all capacitors and load |
| VIN | Input Supply | Accepts 0.9–1.8V single-cell source; bypassed with ≥10µF low-ESR capacitor |
| C3– | CP2 Flying Capacitor Negative | Connects to negative terminal of C3 (0.47–2.2µF ceramic); phase-complementary to C1– |
| C3+ | CP2 Flying Capacitor Positive | Connects to positive terminal of C3; stacked with C2 voltage to generate VOUT |
| VOUT | Regulated 3.3V Output | Disconnected from VIN during shutdown; requires ≥10µF low-ESR output capacitor for regulation stability |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor topology | Eliminates magnetic components and EMI concerns; reduces BOM count and PCB area by >30% vs. inductive boost converters |
| Indefinite short-circuit protection | Self-limiting 20mA short-circuit current prevents damage during accidental VOUT-to-GND faults |
| 0.125in² reference layout | Complete functional circuit fits within 3.2mm × 3.2mm; ideal for pagers, glucose meters, and handheld diagnostics |
| Temperature-stable regulation | 3.3V output maintained across –40°C to 85°C with <±4% deviation; suitable for industrial medical environments |
| Low-noise shutdown control | Sampling-based SHDN avoids false triggering; 20–50µs wake-up latency enables precise noise-sensitive timing windows |
Applications
| Pagers | Battery Backup Supplies |
|---|---|
Use Scenario: Low-power alphanumeric pager requiring continuous standby with periodic RF wake-up. IC Role / Device Role / Timing Role: Primary 3.3V supply for baseband IC and EEPROM during deep sleep; provides regulated rail without inductor-induced RF interference. Use Value: 40µA quiescent current extends 2400mAh AA-cell life to >10 years in standby; shutdown mode cuts leakage to 5µA during transmission gaps. | Use Scenario: SRAM or real-time clock (RTC) backup during main power failure in industrial controllers. IC Role / Device Role / Timing Role: Standby DC/DC converter activated only when main 5V rail drops below threshold; maintains 3.3V for volatile memory retention. Use Value: Guaranteed 0.9V start-up allows operation down to near-dead battery; short-circuit immunity prevents latch-up if backup capacitor fails short. |
| Portable Electronic Equipment | Handheld Medical Instruments |
Use Scenario: Compact barcode scanner powered by single AA cell with LED illumination pulses. IC Role / Device Role / Timing Role: High-efficiency 3.3V source for MCU and CMOS image sensor; supplies burst current for LED driver without input voltage sag. Use Value: 77% efficiency at 1V/10mA minimizes battery drain during scanning; 500kHz switching avoids audible noise in consumer audio bands. | Use Scenario: FDA-classified glucose meter with LCD display, electrochemical sensor, and USB charging interface. IC Role / Device Role / Timing Role: Isolated 3.3V rail for analog front-end and low-power MCU; disconnects load from battery during USB charging to prevent backfeed. Use Value: Shutdown-controlled VIN–VOUT isolation meets IEC 60601 leakage current limits; <0.125in² layout satisfies strict enclosure size constraints. |
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 |
|---|---|---|---|
| LTC1517-3.3 | Higher input range (2.5V–5.5V); 15mA output; same MSOP-8 package | Requires ≥2.5V input; unsuitable for sub-1V alkaline start-up | Select LTC1517-3.3 only if input is ≥2.5V and higher output current is needed |
| LTC1682 | Doubler (not quadrupler); 3.3V output only with external resistor divider; 50mA output; lower noise (60µVRMS) | Cannot generate 3.3V from <1.65V input; needs external feedback network | Choose LTC1682 for low-noise analog rails where input ≥1.65V and higher current is required |
Compared with LTC1517-3.3 and LTC1682, the LTC1502CS8-3.3 uniquely supports guaranteed 0.9V start-up and true single-cell 3.3V generation without external resistive feedback-making it the only drop-in solution for ultra-low-voltage medical and portable devices where battery voltage falls below 1V.
Availability
LTC1502CS8-3.3 is available at Aetrix Electronics and suitable for portable medical instruments, battery-backed memory systems, handheld diagnostic tools, and low-power wireless sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1502CS8-3.3 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 full technical and supply chain continuity for legacy Linear power products.
The LTC1502 family was engineered specifically for single-cell, space-constrained, micropower applications-emphasizing ultra-low start-up voltage, inductorless design, and robust fault protection in medical and portable instrumentation.
FAQ
What is the minimum input voltage required for the LTC1502CS8-3.3 to start up and regulate?
The LTC1502CS8-3.3 guarantees start-up at 0.9V over the commercial temperature range (0°C to 70°C), with testing performed under 100kΩ load on VOUT. At –40°C to 85°C, start-up is specified at 1.1V. This enables reliable operation across the full discharge curve of a single alkaline or NiCd cell, making the LTC1502CS8-3.3 especially suited for battery-powered medical devices where voltage decay must not interrupt function.
How does the LTC1502CS8-3.3 achieve short-circuit protection without external components?
The LTC1502CS8-3.3 uses internal COMP2 hysteresis to limit C2 voltage to ~1.4×VIN during output shorts, forcing CP2 into high-impedance mode cyclically. This self-regulating behavior caps short-circuit current at 20mA typical and allows indefinite VOUT-to-GND faults without damage or thermal shutdown-no fuses, current-sense resistors, or external protection circuitry are needed for the LTC1502CS8-3.3.
Can the LTC1502CS8-3.3 be used with lithium coin cells such as CR2032?
Yes-the LTC1502CS8-3.3 operates across 0.9V–1.8V, matching the nominal 3V and discharged ~2.0V of CR2032 cells when stepped down via resistive divider or Zener clamp. However, direct connection is not recommended due to overvoltage risk; a simple 2-resistor divider reducing CR2032 output to ≤1.8V enables safe, efficient use of the LTC1502CS8-3.3 with coin cells in compact wearables and sensors.
What is the purpose of the C1–/SHDN pin's sampling architecture?
The C1–/SHDN pin is sampled once every 16 clock cycles (≈32µs at 500kHz) to avoid noise-induced false shutdown. During the sample window, an internal pull-up current asserts logic high if no external pull-down is present-ensuring robust operation in noisy environments. This architecture makes the LTC1502CS8-3.3 highly immune to ESD transients and supply ripple, critical for handheld medical instruments where reliability is non-negotiable.
Is the LTC1502CS8-3.3 pin-compatible with other members of the LTC1502 family?
Yes-the LTC1502CS8-3.3 shares identical pinout and package (MSOP-8) with LTC1502IS8-3.3 (industrial grade) and LTC1502CMS8-3.3 (commercial grade). All variants use the same C2/C1+/C1–/SHDN/GND/VIN/C3+/C3–/VOUT assignment and electrical interface, enabling seamless grade substitution without PCB redesign-provided temperature and reliability requirements align with the selected variant's specification.
LTC1502CS8-3.3#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
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.9V
- Voltage - Input (Max):
- 1.8V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 10mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1502CS8-3.3#TRPBF FAQ
1.How can I place an order for LTC1502CS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1502CS8-3.3#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 LTC1502CS8-3.3#TRPBF reliable?
The price and inventory of LTC1502CS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1502CS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1502CS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1502CS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1502CS8-3.3#TRPBF?
LTC1502CS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1502CS8-3.3#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 LTC1502CS8-3.3#TRPBF?
For technical support, including LTC1502CS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1502CS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1502CS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1502CS8-3.3#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 LTC1502CS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1502CS8-3.3#TRPBF?
All LTC1502CS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1502CS8-3.3#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 LTC1502CS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1502CS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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