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Analog Devices Inc. LTC1502CMS8-3.3#PBF
- Part No.:
- LTC1502CMS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1502CMS8-3.3#PBF.pdf
- Description:
- IC REG CHRG PUMP 3.3V 10MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:109
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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 that generates 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, requires no inductors, and integrates short-circuit and overtemperature protection. It is used in space-constrained, battery-powered medical instruments such as glucose meters.
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, 500kHz switching frequency, 50mVP-P output ripple at 10mA, MSOP-8 package footprint, and shutdown-controlled load disconnection from VIN.
Technical Context
The LTC1502CMS8-3.3 implements a two-stage cascaded voltage doubler architecture: CP1 doubles VIN onto C2, then CP2 doubles the C2 voltage to produce VOUT. Regulation is achieved via a hysteretic comparator (COMP1) that disables the oscillator when VOUT exceeds 3.43V and re-enables it when VOUT drops below 3.17V.
Enhanced start-up uses COMP2 to monitor C2 voltage relative to VIN, forcing CP2 into high-impedance until C2 rises above VIN-enabling reliable operation down to 0.9V input with no external load on C2. Shutdown is edge-sampled every 16 clock cycles; pulling C1–/SHDN below 0.55V triggers oscillator halt and internal load disconnect.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.9V to 1.8V - supports single alkaline/NiCd cells without boost pre-regulation |
| Output Voltage | 3.3V ±4% - tightly regulated for 3.3V logic and analog circuitry |
| Max Output Current | 10mA at VIN ≥ 1V - sufficient for low-power microcontrollers and sensors |
| Operating Current | 40µA typical - extends AA-cell battery life beyond 10,000 hours at 10µA average load |
| Shutdown Current | 5µA max - enables ultra-low-power standby in portable medical devices |
| Switching Frequency | 500kHz - allows use of small 1µF ceramic flying capacitors (C1, C3) |
| Output Ripple | 50mVP-P at 10mA - manageable with 10µF low-ESR tantalum + 1µF ceramic parallel output cap |
| Start-Up Voltage | 0.9V guaranteed - ensures operation even as battery discharges below 1.0V |
Pinout & Package
Package: 8-pin MSOP (MS8), 3.0mm × 3.0mm body, 0.65mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C2 | CP1 Output / CP2 Input | Intermediate 2×VIN node; must remain unloaded during start-up to ensure proper gate drive generation |
| C1+ | CP1 Flying Capacitor Positive | Connects to positive terminal of 1µF flying capacitor C1; switches between VIN and C2 |
| C1–/SHDN | CP1 Flying Capacitor Negative & Shutdown Control | Logic input: ≤0.55V = shutdown; internal pull-up returns to active mode when released |
| GND | Power and Signal Ground | Must connect to low-impedance ground plane; reference for all internal comparators and regulators |
| VIN | Main Input Supply | Accepts 0.9V–1.8V; bypassed with ≥10µF low-ESR capacitor to suppress source impedance effects |
| C3– | CP2 Flying Capacitor Negative | Connects to negative terminal of 1µF flying capacitor C3; switches between C2 and VOUT |
| C3+ | CP2 Flying Capacitor Positive | Connects to positive terminal of C3; switches between GND and C2 |
| VOUT | Regulated 3.3V Output | Disconnected from VIN during shutdown; requires ≥10µF low-ESR output capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor topology | Eliminates EMI-sensitive magnetics and simplifies layout in <0.125in² PCB area |
| Guaranteed 0.9V start-up | Enables full functionality from fresh to near-dead single-cell batteries without brown-out reset |
| Internal short-circuit protection | Survives indefinite VOUT-to-GND fault with <20mA peak short-circuit current |
| Shutdown-controlled load isolation | Physically disconnects VOUT from VIN, preventing backfeed and enabling true zero-load standby |
| Thermal shutdown | Protects against sustained overload or ambient >85°C; auto-recovery on cooldown |
Applications
| Pagers | Battery Backup Supplies |
|---|---|
Use Scenario: Low-duty-cycle wireless message reception with intermittent display and audio alert. IC Role / Device Role / Timing Role: Primary 3.3V supply for baseband processor and RF transceiver during active receive bursts. Use Value: 40µA quiescent current extends alkaline battery life to >1 year; 0.9V start-up ensures operation through full discharge curve. | Use Scenario: Maintaining SRAM and real-time clock during main power loss in industrial controllers. IC Role / Device Role / Timing Role: Standby regulator that activates only when AC/DC supply fails, delivering clean 3.3V from backup cell. Use Value: 5µA shutdown current prevents backup cell depletion; load disconnect avoids reverse current into main supply rail. |
| Handheld Medical Instruments | Glucose Meters |
Use Scenario: Portable ECG or pulse oximeter requiring precise analog front-end biasing and low-noise MCU operation. IC Role / Device Role / Timing Role: Main 3.3V rail for ADC reference, op-amps, and ARM Cortex-M0+ core. Use Value: 50mVP-P ripple meets EN 60601-1 conducted emission limits when filtered; MSOP-8 eases routing under compact display module. | Use Scenario: Single-use, strip-based blood glucose measurement with LCD display and button interface. IC Role / Device Role / Timing Role: Sole power converter supplying 3.3V to microcontroller, electrochemical sensor interface, and LCD driver. Use Value: Guaranteed 0.9V start-up ensures first-time activation even with marginal CR2032 or alkaline coin cell; <0.125in² layout fits inside slim housing. |
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 single-cell start-up below 2.0V | Select LTC1517-3.3 only if input is ≥2.5V (e.g., Li-ion or dual-cell systems); not a drop-in replacement for LTC1502CMS8-3.3. |
| LTC1682 | Doubler (not quadrupler); 3.3V output derived from ≥2.5V input; 50mA output; lower noise (60µVRMS) | Cannot generate 3.3V from <2.5V inputs; optimized for low-noise analog rails, not ultra-low-VIN operation | Choose LTC1682 for noise-sensitive analog supplies where input ≥2.5V; LTC1502CMS8-3.3 remains sole option for sub-1.0V start-up. |
Compared with LTC1517-3.3 and LTC1682, the LTC1502CMS8-3.3 uniquely supports 0.9V start-up and single-cell alkaline/NiCd operation - making it irreplaceable in true single-cell, space-constrained, long-life portable medical and consumer devices.
Availability
LTC1502CMS8-3.3 is available at Aetrix Electronics and suitable for handheld medical instruments, glucose meters, and battery backup supplies requiring stable component supply across extended temperature ranges and long 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 full product support, documentation, and manufacturing continuity for legacy Linear parts.
The LTC1502CMS8-3.3 belongs to Linear's micropower charge pump DC/DC converter family, designed specifically for ultra-low-input-voltage, inductorless power conversion in single-cell battery-powered portable electronics.
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 and regulation at 0.9V across the commercial temperature range (0°C to 70°C). At –40°C to 85°C, the guaranteed start-up voltage increases to 1.1V. This specification is verified with a 100kΩ load on VOUT and applies only when C2 is left unloaded during initial power-on.
Does the LTC1502CMS8-3.3 require external inductors?
No, the LTC1502CMS8-3.3 is a capacitor-based quadrupler charge pump and requires no inductors. It operates using five external capacitors: two 1µF ceramic flying caps (C1, C3), one 10µF input cap (CIN), one 10µF intermediate cap (C2), and one 10µF output cap (COUT). This eliminates magnetic EMI and simplifies PCB layout.
How does shutdown work on the LTC1502CMS8-3.3, and what happens to the output during shutdown?
Driving the C1–/SHDN pin below 0.55V (e.g., via open-drain FET or resistor pull-down) places the LTC1502CMS8-3.3 into shutdown. During shutdown, the internal oscillator stops, CP1 and CP2 switches go high-impedance, and VOUT is physically disconnected from VIN. The part draws only 5µA typical shutdown current, and VOUT decays solely due to load and capacitor leakage.
Can the LTC1502CMS8-3.3 safely drive a 10mA load across its full input voltage range?
Yes - the LTC1502CMS8-3.3 delivers 10mA output current with 3.3V ±4% regulation when VIN is ≥1.0V. Below 1.0V, output current capability decreases: at VIN = 0.9V, maximum sustainable load is ~3.5mA while maintaining regulation. Full 10mA performance is confirmed for VIN = 1.0V to 1.8V per Electrical Characteristics table.
What is the purpose of the C2 pin on the LTC1502CMS8-3.3, and why must it not be externally loaded?
The C2 pin is the output of the first doubler stage (CP1) and serves as the input supply for the second doubler (CP2). It must remain unloaded during start-up because COMP2 monitors C2 voltage versus VIN to enable CP2 only after C2 exceeds VIN - ensuring sufficient gate drive voltage for output switches. Loading C2 prematurely causes start-up failure or unstable regulation.
LTC1502CMS8-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1502CMS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1502CMS8-3.3#PBF 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#PBF reliable?
The price and inventory of LTC1502CMS8-3.3#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1502CMS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1502CMS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1502CMS8-3.3#PBF?
LTC1502CMS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1502CMS8-3.3#PBF 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#PBF?
For technical support, including LTC1502CMS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1502CMS8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1502CMS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1502CMS8-3.3#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1502CMS8-3.3#PBF?
All LTC1502CMS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1502CMS8-3.3#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC1502CMS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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