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Analog Devices Inc. LTC1502CMS8-3.3#TRPBF
- Part No.:
- LTC1502CMS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1502CMS8-3.3#TRPBF.pdf
- Description:
- IC REG CHRG PUMP 3.3V 10MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,539
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Product details
Overview
LTC1502CMS8-3.3 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 at VIN ≥1V, operates with only five external capacitors (no inductors), and features 40µA typical operating current and 5µA shutdown current. It is used in space-constrained, battery-powered medical and portable instrumentation.
For engineers reviewing the LTC1502CMS8-3.3 datasheet, LTC1502CMS8-3.3 pinout, LTC1502CMS8-3.3 application, or LTC1502CMS8-3.3 equivalent, key selection criteria include guaranteed 0.9V start-up, shutdown-controlled load disconnection, short-circuit protection, MSOP-8 footprint compatibility, and efficiency above 77% at 10mA.
Technical Context
The LTC1502CMS8-3.3 implements a two-stage cascaded voltage doubler architecture: CP1 doubles VIN onto C2, which then serves as the input for CP2 to produce the final 3.3V output. Regulation is achieved via a hysteresis-based comparator (COMP1) that disables the 500kHz oscillator when VOUT exceeds the upper trip point (3.43V) and re-enables it when VOUT falls below the lower trip point (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 down to 0.9V with no external load on C2. Shutdown is edge-triggered every 16 clock cycles via sampling of the C1–/SHDN pin, with internal pull-up ensuring automatic recovery when the external pull-down is removed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.9V to 1.8V - supports single alkaline/NiCd cells without under-voltage lockout failure |
| Output Voltage | 3.3V ±4% - tightly regulated for logic-level microcontrollers and sensors |
| Max Output Current | 10mA at VIN ≥1V - sufficient for low-power MCU peripherals and glucose meter displays |
| Operating Current | 40µA typical - extends AA battery life beyond 10,000 hours at 10µA average load |
| Shutdown Current | 5µA - enables ultra-low-power sleep modes in handheld medical devices |
| Switching Frequency | 500kHz - allows use of small 1µF ceramic flying capacitors and minimizes PCB area |
| Start-Up Voltage | 0.9V guaranteed - ensures functionality even as battery discharges below 1.0V |
| Short-Circuit Protection | Indefinite VOUT-to-GND survival - eliminates need for external fuse or current-limiting circuitry |
Pinout & Package
Package: 8-pin MSOP (MS8), 3.0mm × 3.0mm body, 0.65mm pitch, exposed pad not present. Thermal resistance θJA = 250°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C2 (Pin 1) | CP1 Output / CP2 Input | Intermediate 2×VIN node; must remain unloaded during start-up to ensure proper gate drive development |
| C1+ (Pin 2) | CP1 Flying Capacitor Positive | Connects to positive terminal of 1µF flying capacitor C1; carries switching current at 500kHz |
| C1–/SHDN (Pin 3) | CP1 Flying Capacitor Negative & Shutdown Control | Pulled low (≤0.2V) to enter shutdown; sampled every 16 clocks; internal 2.5µA pull-up enables auto-recovery |
| GND (Pin 4) | Analog Ground Reference | Primary ground return for all internal circuits; requires low-impedance connection to PCB ground plane |
| VIN (Pin 5) | Main Input Supply | Accepts 0.9V–1.8V single-cell source; bypassed with ≥10µF low-ESR capacitor to suppress input ripple |
| C3– (Pin 6) | CP2 Flying Capacitor Negative | Connects to negative terminal of 1µF flying capacitor C3; shares switching node with C1–/SHDN during phase transitions |
| C3+ (Pin 7) | CP2 Flying Capacitor Positive | Connects to positive terminal of 1µF flying capacitor C3; switches between C2 and VOUT nodes |
| VOUT (Pin 8) | Regulated 3.3V Output | Disconnected from VIN during shutdown; requires ≥10µF low-ESR output capacitor for <50mVP-P ripple at 10mA |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor topology | Eliminates magnetic EMI, reduces BOM count by 1–2 components, and enables <0.125in² total PCB area |
| Guaranteed 0.9V start-up | Ensures reliable power-up from fresh or partially depleted alkaline cells without external boost assist |
| Load disconnect in shutdown | Prevents battery drain through downstream circuitry during storage or sleep, critical for medical device shelf life |
| Indefinite short-circuit survival | Withstands continuous VOUT-to-GND faults without latch-up or thermal damage-no external protection needed |
| Low 40µA quiescent current | Enables >1-year battery life in glucose meters with intermittent 10-second measurement cycles |
| MSOP-8 package | Provides 35% smaller footprint than SO-8 while maintaining same pinout compatibility and thermal performance |
Applications
| Pagers | Battery Backup Supplies |
|---|---|
Use Scenario: Low-duty-cycle wireless message reception with periodic LCD refresh and audible alert. IC Role / Device Role / Timing Role: Primary 3.3V supply for baseband processor and display driver during active intervals; enters shutdown between messages. Use Value: 5µA shutdown current extends AA battery life to >6 months; 0.9V start-up ensures operation until cell reaches end-of-life. | Use Scenario: Maintaining SRAM or real-time clock during main power loss in industrial controllers. IC Role / Device Role / Timing Role: Standby regulator activated automatically upon AC failure; provides clean, regulated 3.3V without reverse current flow. Use Value: Load disconnect prevents backup cell self-discharge; short-circuit immunity avoids failure if RTC line is accidentally shorted. |
| Portable Electronic Equipment | Handheld Medical Instruments |
Use Scenario: Powering Bluetooth LE modules and touch controllers in compact fitness trackers. IC Role / Device Role / Timing Role: Main DC/DC converter supplying 3.3V to RF transceiver and sensor hub; synchronized shutdown with host MCU sleep states. Use Value: 40µA operating current enables multi-week runtime on coin cell; MSOP-8 footprint fits within 12mm × 12mm board area. | Use Scenario: Providing regulated 3.3V to ADC, microcontroller, and LCD in FDA-cleared glucose meters. IC Role / Device Role / Timing Role: Core power management IC enabling clinical-grade accuracy by minimizing supply noise and drift. Use Value: <50mVP-P output ripple ensures <0.1% ADC error; guaranteed start-up at 0.9V covers full battery discharge curve. |
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–4.5V); 15mA output; uses different charge pump topology (doubler + LDO) | Requires ≥2.5V input; unsuitable for single-cell alkaline but better for Li-ion or dual-cell NiMH | Select LTC1517-3.3 only when input exceeds 2.5V and higher output current is needed |
| LTC1682 | Doubler-only (not quadrupler); 3.3V output derived from 1.65V–3.6V input; 50mA output; 60µVRMS noise | Lacks single-cell start-up capability; optimized for low-noise analog rails, not ultra-low-VIN digital supplies | Choose LTC1682 for noise-sensitive analog signal chains where input ≥1.65V and 3.3V regulation is secondary to spectral purity |
Compared with LTC1517-3.3 and LTC1682, the LTC1502CMS8-3.3 uniquely supports sub-1V start-up and delivers regulated 3.3V from a single alkaline cell-making it irreplaceable in true single-cell, space-constrained, long-life portable medical and consumer applications.
Availability
LTC1502CMS8-3.3 is available at Aetrix Electronics and suitable for pagers, battery backup supplies, and handheld medical instruments requiring stable component supply across extended production lifecycles.
Supply support for LTC1502CMS8-3.3 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 its precision analog and power management portfolio with full backward compatibility and long-term support.
The LTC1502CMS8-3.3 belongs to Linear's micropower charge pump DC/DC converter family, engineered specifically for single-cell, ultra-low-power portable instrumentation where inductor-free design and guaranteed sub-1V start-up are mandatory.
FAQ
What is the minimum input voltage required for the LTC1502CMS8-3.3 to start up and regulate?
The LTC1502CMS8-3.3 guarantees start-up at 0.9V across the full commercial temperature range (0°C to 70°C). At –40°C to 85°C, start-up is specified at 1.1V. This is verified by testing with a 100kΩ load on VOUT and ensures reliable operation as a single alkaline cell discharges from 1.5V down to endpoint.
Does the LTC1502CMS8-3.3 require external inductors?
No, the LTC1502CMS8-3.3 is an inductorless charge pump DC/DC converter. It uses only five external capacitors: two 1µF ceramic flying capacitors (C1, C3) and three 10µF low-ESR bulk capacitors (CIN, C2, COUT). This eliminates magnetic EMI, simplifies layout, and reduces solution size to under 0.125in².
How does shutdown work on the LTC1502CMS8-3.3, and what happens to the load during shutdown?
Driving the C1–/SHDN pin low (≤0.2V) places the LTC1502CMS8-3.3 into shutdown mode. During shutdown, the internal oscillator stops, CP1 and CP2 switches go high-impedance, and VOUT is actively disconnected from VIN. This prevents battery drain through downstream circuitry and enables true zero-current standby.
Is the LTC1502CMS8-3.3 protected against output short circuits?
Yes, the LTC1502CMS8-3.3 includes built-in short-circuit protection. When VOUT is shorted to GND, internal circuitry limits peak output current to under 20mA and cycles CP2 to prevent thermal runaway. The device survives indefinite short-circuit conditions without damage or latch-up-no external protection components are required.
What is the recommended output capacitor for the LTC1502CMS8-3.3 to achieve ≤50mVP-P ripple at 10mA load?
To achieve ≤50mVP-P output ripple at 10mA with VIN = 1.25V, the LTC1502CMS8-3.3 requires a ≥10µF low-ESR capacitor on VOUT-typically a 10µF to 22µF tantalum or polymer capacitor. For lowest high-frequency noise, pair it with a 1µF to 3.3µF ceramic capacitor in parallel. Avoid capacitors with ESR > 0.5Ω.
LTC1502CMS8-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
LTC1502CMS8-3.3#TRPBF FAQ
1.How can I place an order for LTC1502CMS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1502CMS8-3.3#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 LTC1502CMS8-3.3#TRPBF reliable?
The price and inventory of LTC1502CMS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1502CMS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1502CMS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1502CMS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1502CMS8-3.3#TRPBF?
LTC1502CMS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1502CMS8-3.3#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 LTC1502CMS8-3.3#TRPBF?
For technical support, including LTC1502CMS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1502CMS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1502CMS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1502CMS8-3.3#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 LTC1502CMS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1502CMS8-3.3#TRPBF?
All LTC1502CMS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1502CMS8-3.3#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 LTC1502CMS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1502CMS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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