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Analog Devices Inc. LTC1502CS8-3.3#PBF
- Part No.:
- LTC1502CS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1502CS8-3.3#PBF.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 10MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:185
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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 at VIN ≥1V, requires no inductors, and features shutdown disconnect, 40µA operating current, and short-circuit protection-ideal for space-constrained portable medical devices and battery backup supplies.
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, 500kHz switching frequency, 50mVP-P output ripple at 10mA, thermal shutdown, and compatibility with 8-pin SO package layouts requiring <0.125in² PCB area.
Technical Context
The LTC1502CS8-3.3 implements a two-stage cascaded voltage doubler architecture: CP1 doubles VIN onto C2, which then serves as the input for CP2 to quadruple the voltage to VOUT. Regulation uses a hysteretic comparator (COMP1) that disables the oscillator when VOUT exceeds 3.43V and re-enables it below 3.17V.
Enhanced start-up employs 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 load. Shutdown is controlled via sampled logic on the C1–/SHDN pin every 16 clock cycles, with internal pull-up ensuring return to active mode upon external pull-down removal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±4% (3.17V–3.43V), regulated across 0.9V–1.8V input and 0–10mA load |
| Input Voltage Range | 0.9V to 1.8V; guaranteed start-up at 0.9V (0.75V min at 25°C) |
| Max Output Current | 10mA at VIN ≥1V; short-circuit current limited to 20mA indefinite |
| Operating Current | 40µA typical (no load), enabling >10,000 hours runtime from 2400mAh AA cell at 10µA avg load |
| Shutdown Current | 5µA max (C1–/SHDN = 0V), disconnecting VOUT from VIN |
| Switching Frequency | 500kHz free-running oscillator, fixed frequency for predictable EMI filtering |
| Output Ripple | 50mVP-P at VIN = 1.25V, IOUT = 10mA, with 10µF low-ESR output capacitor |
| Protection Features | Short-circuit and overtemperature protection; survives indefinite VOUT-to-GND fault |
Pinout & Package
Package: 8-lead plastic SO (Small Outline, narrow 0.150-inch body), RoHS-compliant, surface-mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C2 (Pin 1) | CP1 Output / CP2 Input | Intermediate 2×VIN node; must remain unloaded during start-up; bypass with ≥10µF low-ESR cap |
| C1+ (Pin 2) | CP1 Flying Capacitor Positive | Connects to positive terminal of C1 (0.47–2.2µF ceramic); critical for charge transfer timing |
| C1–/SHDN (Pin 3) | CP1 Flying Capacitor Negative & Shutdown Control | Pull to GND via ≈100Ω resistor to enter shutdown; internal sampling ensures noise immunity |
| GND (Pin 4) | Power Ground Reference | Low-impedance connection to ground plane required for stability and ripple suppression |
| VIN (Pin 5) | Input Supply | Accepts 0.9–1.8V single-cell source; bypass with ≥10µF low-ESR capacitor to GND |
| C3– (Pin 6) | CP2 Flying Capacitor Negative | Connects to negative terminal of C3 (0.47–2.2µF ceramic); completes second doubler stage |
| C3+ (Pin 7) | CP2 Flying Capacitor Positive | Connects to positive terminal of C3; enables stacking of CP2 output onto C2 voltage |
| VOUT (Pin 8) | Regulated 3.3V Output | Disconnection from VIN during shutdown; bypass with ≥10µF low-ESR capacitor for regulation |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor topology | Eliminates magnetic components, reducing EMI, board area (<0.125in²), and BOM cost |
| Guaranteed 0.9V start-up | Enables use with aging alkaline cells down to end-of-life voltage without brownout |
| Load-disconnect shutdown | Prevents battery drain when inactive; isolates VOUT from VIN to avoid backfeed |
| Indefinite short-circuit survival | Internal current limiting and hysteresis protect against damage during field faults |
| Thermal shutdown | Automatically disables operation above TJ = 125°C, preventing permanent failure |
| Low-noise regulation | Hysteretic control avoids PWM jitter; 50mVP-P ripple supports analog sensor interfaces |
Applications
| Pagers | Battery Backup Supplies |
|---|---|
Use Scenario: Low-power alphanumeric pager receiving intermittent RF bursts in handheld form factor. IC Role / Device Role / Timing Role: Primary 3.3V supply for baseband processor and display driver during receive mode. Use Value: 40µA quiescent current extends AA cell life beyond 6 months; 0.9V start-up ensures operation until battery depletion. | Use Scenario: SRAM retention circuit maintaining data during main power loss in industrial PLCs. IC Role / Device Role / Timing Role: Standby regulator providing clean 3.3V to volatile memory when AC fails. Use Value: Shutdown disconnect prevents backup cell self-discharge; short-circuit tolerance guards against accidental VOUT shorts. |
| Portable Electronic Equipment | Handheld Medical Instruments |
Use Scenario: Compact barcode scanner powered by single alkaline AA cell with intermittent motor and laser activation. IC Role / Device Role / Timing Role: Main system rail generator enabling microcontroller wake-up and peripheral sequencing. Use Value: 10mA output sustains peak loads during scan; no-inductor design avoids EMI interference with optical sensors. | Use Scenario: Glucose meter requiring precise ADC reference and LCD bias under variable battery voltage. IC Role / Device Role / Timing Role: Stable 3.3V source for precision analog front-end and digital controller. Use Value: 3.3V ±4% regulation ensures consistent ADC full-scale and LCD contrast; low ripple minimizes measurement noise. |
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; same 3.3V ±4% regulation | Requires ≥2.5V input; unsuitable for single-cell alkaline below 2.5V | Select when input is Li-ion or dual-cell; not drop-in for 0.9–1.8V systems |
| LTC1682 | Doubler only (2×); 50mA output; 60µVRMS noise; no shutdown | Lacks quadrupling, shutdown, and start-up capability below 1.5V | Choose for ultra-low-noise 2× boost where 3.3V must be derived from ≥1.65V source |
Compared with LTC1517-3.3 and LTC1682, the LTC1502CS8-3.3 uniquely supports sub-1V start-up and single-cell alkaline operation while integrating shutdown and robust fault protection-making it irreplaceable in true low-voltage portable medical and backup applications.
Availability
LTC1502CS8-3.3 is available at Aetrix Electronics and suitable for pagers, battery backup supplies, and handheld medical instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
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 its legacy precision analog and power management portfolio.
The LTC1502CS8-3.3 belongs to Linear's micropower charge pump DC/DC converter family, engineered specifically for single-cell battery-powered systems where size, efficiency, and ultra-low quiescent current are critical.
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 across the commercial temperature range (0°C to 70°C), with a typical minimum of 0.75V at 25°C. At –40°C to 85°C, start-up is specified at 1.1V. This enables reliable operation with aging alkaline or NiCd cells well into end-of-life discharge.
Does the LTC1502CS8-3.3 require external inductors?
No, the LTC1502CS8-3.3 is a capacitor-based quadrupler charge pump and requires zero inductors. It operates using five external capacitors (C1, C2, C3, CIN, COUT), all of which can be low-ESR ceramics or tantalums-reducing EMI, board area, and component count.
How does shutdown functionality work on the LTC1502CS8-3.3?
Shutdown is activated by pulling the C1–/SHDN pin (Pin 3) low via an external resistor (~100Ω) or open-drain FET. The internal circuit samples this pin every 16 clock cycles; when held below 0.2V, it stops the oscillator and disconnects VOUT from VIN, reducing current draw to 5µA max.
What protection features are integrated into the LTC1502CS8-3.3?
The LTC1502CS8-3.3 includes short-circuit protection (survives indefinite VOUT-to-GND fault), overtemperature shutdown (TJ > 125°C), and internal current limiting. During output short, it limits current to ~20mA by cycling CP2 enable/disable, preventing thermal damage.
Can the LTC1502CS8-3.3 be used with a 10µF output capacitor, and what is the expected ripple?
Yes-the LTC1502CS8-3.3 is characterized with a 10µF low-ESR output capacitor. Under 10mA load and VIN = 1.25V, output ripple is 50mVP-P. Using larger or lower-ESR capacitors (e.g., 22µF tantalum + 1µF ceramic) further reduces both low- and high-frequency ripple components.
LTC1502CS8-3.3#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1502CS8-3.3#PBF FAQ
1.How can I place an order for LTC1502CS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1502CS8-3.3#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 LTC1502CS8-3.3#PBF reliable?
The price and inventory of LTC1502CS8-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1502CS8-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1502CS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1502CS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1502CS8-3.3#PBF?
LTC1502CS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1502CS8-3.3#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 LTC1502CS8-3.3#PBF?
For technical support, including LTC1502CS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1502CS8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1502CS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1502CS8-3.3#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 LTC1502CS8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1502CS8-3.3#PBF?
All LTC1502CS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1502CS8-3.3#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 LTC1502CS8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1502CS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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