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Analog Devices Inc. LTC1502IS8-3.3#PBF
- Part No.:
- LTC1502IS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1502IS8-3.3#PBF.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 10MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:190
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Product details
Overview
LTC1502IS8-3.3 from Analog Devices (formerly Linear Technology) is a regulated quadrupler charge pump DC/DC converter designed to generate a stable 3.3V 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 and portable instrumentation.
For engineers reviewing the LTC1502IS8-3.3 datasheet, LTC1502IS8-3.3 pinout, LTC1502IS8-3.3 application, or LTC1502IS8-3.3 equivalent, key selection criteria include guaranteed 0.9V start-up voltage, ±4% output regulation at 3.3V, 500kHz switching frequency, 8-pin MSOP package compatibility, and shutdown-controlled load disconnection from VIN.
Technical Context
The LTC1502IS8-3.3 implements a two-stage cascaded doubler architecture: CP1 doubles VIN onto C2, which then serves as the input for CP2 to quadruple the voltage to VOUT. Regulation is achieved via a hysteretic comparator (COMP1) that enables/disables the oscillator based on divided VOUT versus a 1.2V reference.
Enhanced start-up uses COMP2 to monitor the divided C2 voltage against VIN, disabling CP2 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 wake-up 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 across full discharge curve. |
| Output Voltage | 3.3V ±4% - tightly regulated for logic-level supply in low-power microcontrollers. |
| Max Output Current | 10mA at VIN ≥ 1V - sufficient for backup memory, sensors, or low-duty-cycle RF transceivers. |
| Operating Current | 40µA typical - extends AA-cell battery life beyond 10,000 hours at 10µA average load. |
| Shutdown Current | 5µA max - preserves battery during extended standby in handheld medical devices. |
| Switching Frequency | 500kHz - enables use of small 1µF ceramic flying capacitors and minimizes PCB area. |
| Start-Up Voltage | 0.9V guaranteed - ensures operation even at end-of-life battery voltage. |
| Output Ripple | 50mVP-P at 10mA - manageable with standard 10µF low-ESR tantalum output capacitor. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, exposed pad not present, RoHS-compliant (Pb-free).
| 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 high-frequency switching current. |
| C1–/SHDN (Pin 3) | CP1 Flying Capacitor Negative & Shutdown Control | Logic input: ≤0.2V forces shutdown; internal 2.5µA pull-up returns to active mode when released. |
| GND (Pin 4) | Analog Ground Reference | Primary return path for all internal bias and switching currents; requires low-impedance connection to 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 timing. |
| C3+ (Pin 7) | CP2 Flying Capacitor Positive | Connects to positive terminal of C3; stacked with C2 voltage to generate final 4×VIN output. |
| VOUT (Pin 8) | Regulated 3.3V Output | Delivers regulated power; disconnected from VIN during shutdown; bypassed with ≥10µF low-ESR capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor topology | Eliminates magnetic components, reducing EMI risk and enabling <0.125in² total PCB footprint. |
| Indefinite short-circuit survival | Internal current limiting caps short-circuit current at ~20mA, preventing thermal damage during fault conditions. |
| Guaranteed 0.9V start-up | Enables reliable boot-up from deeply discharged alkaline cells without external boost assist. |
| Load disconnect in shutdown | Prevents battery drain through downstream circuitry when system is powered off. |
| Low-noise regulation architecture | Hysteretic control avoids PWM jitter; output ripple dominated by capacitor ESR, not switching artifacts. |
Applications
| Pagers | Battery Backup Supplies |
|---|---|
Use Scenario: Low-power alphanumeric pager receiving intermittent paging bursts in remote locations. IC Role / Device Role / Timing Role: Primary 3.3V supply for baseband processor and RF front-end during receive mode. Use Value: 40µA quiescent current extends AA-cell life to >1 year with typical usage; 0.9V start-up ensures operation until battery reaches 0.8V. | Use Scenario: SRAM retention during main power loss in industrial data loggers. IC Role / Device Role / Timing Role: Standby voltage source automatically engaged when main 5V rail drops below threshold. Use Value: 5µA shutdown current prevents measurable battery depletion over multi-year storage; load disconnect isolates backup cell from system leakage paths. |
| Handheld Medical Instruments | Glucose Meters |
Use Scenario: Portable ECG monitor requiring FDA-compliant low-power operation and rapid wake-up. IC Role / Device Role / Timing Role: Main logic supply for microcontroller and analog front-end during measurement cycles. Use Value: 500kHz switching allows compact 1µF ceramic flying caps; <0.125in² layout fits within tight mechanical envelope of handheld enclosure. | Use Scenario: Consumer glucose meter using disposable alkaline button cell for single-use test strips. IC Role / Device Role / Timing Role: Regulated 3.3V rail for ADC, LCD driver, and strip interface circuitry. Use Value: Guaranteed 0.9V start-up ensures full functionality even with aged or cold batteries; ±4% output tolerance meets ADC reference stability requirements. |
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 3.3V ±4% regulation. | Requires ≥2.5V input - unsuitable for single-cell alkaline below 2.5V; better for Li-ion or dual-cell systems. | Select LTC1517-3.3 only if input exceeds 2.5V and >10mA load is needed; not a drop-in replacement for LTC1502IS8-3.3. |
| LTC1682 | Doubler (not quadrupler); 3.3V output derived from ≥2.5V input; 50mA output; 60µVRMS noise. | Cannot generate 3.3V from <2.5V inputs; optimized for low-noise analog supplies, not ultra-low-voltage start-up. | Choose LTC1682 for noise-sensitive analog rails where input ≥2.5V is guaranteed; incompatible with single-cell start-up requirement. |
Compared with LTC1517-3.3 and LTC1682, the LTC1502IS8-3.3 uniquely supports sub-1V start-up and single-cell alkaline operation while maintaining tight 3.3V regulation-making it irreplaceable in true single-cell, space-constrained, long-life portable designs.
Availability
LTC1502IS8-3.3 is available at Aetrix Electronics and suitable for handheld medical instruments, glucose meters, battery backup supplies, and pagers requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for LTC1502IS8-3.3 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 LTC1502IS8-3.3 belongs to Linear's micropower charge pump DC/DC converter family, engineered specifically for ultra-low-voltage, single-cell battery applications where inductor-free design and minimal quiescent current are critical.
FAQ
What is the minimum input voltage required for the LTC1502IS8-3.3 to start up and regulate?
The LTC1502IS8-3.3 guarantees start-up at 0.9V across the full operating temperature range (–40°C to 85°C). At 25°C, it can start as low as 0.75V. This specification is verified with a 100kΩ load on VOUT and ensures reliable operation from aging alkaline or NiCd cells well into end-of-discharge.
Does the LTC1502IS8-3.3 require external inductors?
No, the LTC1502IS8-3.3 is a capacitor-based quadrupler charge pump and requires zero inductors. It operates with 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 layout.
How does shutdown work on the LTC1502IS8-3.3, and what happens to the load during shutdown?
Driving the C1–/SHDN pin (Pin 3) below 0.2V places the LTC1502IS8-3.3 into shutdown, stopping the oscillator and disconnecting VOUT from VIN via an internal switch. During shutdown, the part draws only 5µA, and the load is fully isolated from the input source-preventing battery drain through downstream circuitry.
What is the maximum continuous output current the LTC1502IS8-3.3 can deliver?
The LTC1502IS8-3.3 delivers up to 10mA continuous output current when VIN is ≥1V. At lower input voltages (e.g., 0.9V), output current capability decreases due to reduced energy transfer per switching cycle; the device remains functional but cannot sustain 10mA under those conditions.
Is the LTC1502IS8-3.3 protected against output short circuits?
Yes, the LTC1502IS8-3.3 includes robust short-circuit protection. When VOUT is shorted to GND, internal circuitry limits peak output current to ~20mA and prevents thermal damage. The device survives indefinite short-circuit conditions and resumes normal regulation immediately upon removal of the short.
LTC1502IS8-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1502IS8-3.3#PBF FAQ
1.How can I place an order for LTC1502IS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1502IS8-3.3#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 LTC1502IS8-3.3#PBF reliable?
The price and inventory of LTC1502IS8-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1502IS8-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1502IS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1502IS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1502IS8-3.3#PBF?
LTC1502IS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1502IS8-3.3#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 LTC1502IS8-3.3#PBF?
For technical support, including LTC1502IS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1502IS8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1502IS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1502IS8-3.3#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 LTC1502IS8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1502IS8-3.3#PBF?
All LTC1502IS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1502IS8-3.3#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 LTC1502IS8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1502IS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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