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Texas Instruments LM828M5
- Part No.:
- LM828M5
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM828M5.pdf
- Description:
- IC REG CHARGE PUMP INV SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,371
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Product details
Overview
LM828M5 from Texas Instruments is a CMOS switched-capacitor voltage inverter IC that converts +1.8V to +5.5V input into corresponding −1.8V to −5.5V negative output, delivering up to 25 mA with 20 Ω typical output impedance and 97% conversion efficiency at 5 mA load - used in operational amplifier and interface power supplies for portable instrumentation.
For engineers reviewing the LM828M5 datasheet, LM828M5 pinout, LM828M5 application, or LM828M5 equivalent, key selection criteria include its SOT-23-5 package, 12 kHz internal oscillator frequency, 40 µA quiescent current, and verified performance across −40°C to +85°C ambient temperature range.
Technical Context
The LM828M5 implements a four-switch CMOS charge-pump topology that alternates capacitor charging and transfer phases to invert input voltage without inductors. Its internal 12 kHz oscillator drives switching at 6 kHz (fSW = fOSC/2), minimizing output ripple while enabling low-ESR ceramic or tantalum capacitor use.
Output regulation relies on external passive components: C1 (pumping) and C2 (output) capacitors define output resistance (ROUT ≈ 4×C1-ESR + RSW + C2-ESR) and ripple magnitude. The device operates with no feedback loop or internal regulation - output voltage is nominally −VIN, dropping linearly under load per ROUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.8V to +5.5V - supports single-cell Li-ion, 3.3V/5V logic rails, and battery-powered systems without external regulators. |
| Output Voltage Range | −1.8V to −5.5V - inverted, unregulated output directly tracks input magnitude with polarity reversal. |
| Max Output Current | 25 mA - sufficient for dual-rail op-amps, RS-232 interface bias, and low-power analog circuitry. |
| Quiescent Current | 40 µA - enables >96% efficiency at light loads, critical for extended battery life in handheld instruments. |
| Output Impedance | 20 Ω typical - determines load-induced voltage drop (e.g., 100 mV drop at 5 mA); minimized via low-ESR capacitors. |
| Oscillator Frequency | 12 kHz - sets switching frequency at 6 kHz, balancing EMI, capacitor size, and ripple performance. |
| Operating Temp | −40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.45 mm body, gull-wing leads, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Negative voltage output | Delivers inverted supply; connects to load ground reference and output capacitor (C2) cathode. |
| 2 (V+) | Positive input supply | Accepts 1.8–5.5V source; powers internal oscillator and switches; must be bypassed near pin. |
| 3 (CAP−) | Charge-pump capacitor negative node | Connects to negative terminal of pumping capacitor C1; forms return path during charge-transfer phase. |
| 4 (GND) | Ground reference | System ground common for V+, CAP−, and load return; requires low-impedance PCB connection. |
| 5 (CAP+) | Charge-pump capacitor positive node | Connects to positive terminal of C1; alternately charges from V+ and discharges to C2 via internal switches. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting charge-pump architecture | Eliminates inductors and transformers - reduces BOM cost, board area, and EMI in space-constrained designs. |
| 20 Ω typical output impedance | Enables stable ±5V dual-rail operation for rail-to-rail op-amps with <100 mV droop at 5 mA load. |
| 97% conversion efficiency at 5 mA | Extends battery runtime in PDAs and handheld test gear where standby current and light-load efficiency dominate. |
| 40 µA quiescent current | Allows direct connection to always-on battery rails without significant parasitic drain in sleep modes. |
| SOT-23-5 footprint | Compatible with standard pick-and-place and reflow processes; matches industry-standard layout and stencil design. |
Applications
| Operational Amplifier Power Supplies | Interface Power Supplies |
|---|---|
|
Use Scenario: Dual-supply op-amps (e.g., TL072, OPA234) require symmetric ±V rails in portable audio preamps and sensor signal conditioning circuits. IC Role / Device Role / Timing Role: LM828M5 generates clean, low-noise negative rail from existing +3.3V or +5V system supply. Use Value: Eliminates need for discrete inductor-based inverter or second battery cell - reduces size, cost, and layout complexity. |
Use Scenario: RS-232 transceivers (e.g., MAX3232) require ±10V-level signals but operate from 3.3V/5V logic supplies. IC Role / Device Role / Timing Role: LM828M5 provides −5.5V rail to bias RS-232 driver stages, enabling true voltage-level translation. Use Value: Achieves full RS-232 compliance without external DC-DC converter - simplifies power tree in compact embedded modules. |
| Handheld Instruments | Cellular Phones |
|
Use Scenario: Portable multimeters and oscilloscope probes need isolated negative bias for front-end amplifiers and ADC references. IC Role / Device Role / Timing Role: LM828M5 delivers regulated-negative rail from main Li-ion battery (3.0–4.2V) with minimal quiescent draw. Use Value: Enables >100-hour battery life in measurement mode by maintaining 40 µA operating current and high light-load efficiency. |
Use Scenario: Baseband processors and RF front-ends in legacy GSM handsets require negative bias for analog subsystems and LCD drivers. IC Role / Device Role / Timing Role: LM828M5 supplies −2.8V rail from 3.3V PMIC output to support analog audio codecs and display controllers. Use Value: Fits tight SOT-23 footprint constraints while meeting stringent EMI limits due to fixed 6 kHz switching frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Higher 100 kHz switching frequency; 17 Ω ROUT; requires 1 µF capacitors vs. LM828M5's 10 µF. | Better suited for low-ripple, high-frequency noise-sensitive applications (e.g., precision ADC references). | Select MAX680ESA+ when lower output impedance and reduced capacitor size outweigh higher quiescent current (120 µA). |
| ICL7660SIPAZ | Wider input range (1.5–12V); 35 Ω ROUT; 125 µA IQ; SOIC-8 package. | Preferred for higher-voltage industrial sensors or legacy 9V-battery systems needing robustness over size. | Choose ICL7660SIPAZ when input exceeds 5.5V or board space allows SOIC-8; avoid for ultra-low-power handheld use. |
Compared with MAX680ESA+ and ICL7660SIPAZ, the LM828M5 offers the lowest quiescent current (40 µA) and smallest footprint (SOT-23-5), making it optimal for battery-critical, space-constrained applications where moderate output impedance is acceptable.
Availability
LM828M5 is available at Aetrix Electronics and suitable for operational amplifier power supplies, interface power supplies, and handheld instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM828M5 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in power management innovation.
The LM828M5 belongs to TI's legacy switched-capacitor voltage converter product line, designed specifically for low-power, inductorless negative rail generation in portable and battery-operated systems.
FAQ
What is the maximum continuous output current specification for the LM828M5?
The LM828M5 supports up to 25 mA of continuous output current under typical conditions, as confirmed in the Electrical Characteristics table of the SNOS035D datasheet. Absolute maximum ratings allow 50 mA peak, but sustained operation above 25 mA increases output voltage droop and thermal stress - design margin should maintain ≤25 mA for reliable performance across −40°C to +85°C.
Does the LM828M5 require external feedback or regulation circuitry to maintain stable output voltage?
No, the LM828M5 is an unregulated charge-pump inverter - its output voltage is nominally −VIN and drops linearly with load current per its 20 Ω typical output impedance. For regulated outputs, TI recommends cascading with an LDO like LP2980, as shown in Figure 16 of the LM828M5 datasheet. The LM828M5 itself contains no feedback loop, reference, or error amplifier.
Which capacitor types and values are recommended for optimal performance with the LM828M5?
Texas Instruments specifies 10 µF low-ESR capacitors for both C1 (pumping) and C2 (output) in the LM828M5 test circuit. Recommended types include AVX TPS-series tantalum, Murata/X7R ceramic, or Nichicon PL-series aluminum electrolytic. Low ESR is critical: high-ESR capacitors increase output impedance, reduce efficiency, and raise ripple - directly degrading LM828M5 performance per Equation 1 in the datasheet.
Can multiple LM828M5 devices be paralleled to increase output current capability?
Yes, the LM828M5 datasheet explicitly supports paralleling: each device uses its own C1 capacitor, while sharing a common C2 output capacitor. Paralleling reduces effective output resistance per Equation 4 (ROUT = Rsingle/N), enabling higher load currents and lower droop. However, ensure matched layout and thermal management - uneven heating may cause current imbalance between parallel LM828M5 units.
What is the thermal performance limit for continuous operation of the LM828M5 in SOT-23-5 package?
The LM828M5 has a maximum junction temperature (TJMax) of 150°C and a thermal resistance θJA of 300°C/W in standard JEDEC high-K board conditions. At 25°C ambient and 25 mA load, power dissipation is ~125 mW - resulting in ~37.5°C junction rise. To stay within safe margins, keep ambient ≤85°C and ensure adequate copper pour under the exposed pad (if present) or adjacent GND traces to enhance heat spreading for the LM828M5.
LM828M5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 25mA
- Frequency - Switching:
- 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM828M5 FAQ
1.How can I place an order for LM828M5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM828M5 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 LM828M5 reliable?
The price and inventory of LM828M5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM828M5 is usually 5 days.
3.What payment methods are accepted for LM828M5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM828M5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM828M5?
LM828M5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM828M5 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 LM828M5?
For technical support, including LM828M5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM828M5 requirements.
6.How does Aetrix verify that LM828M5 is sourced from the original manufacturer or authorized distributors?
All LM828M5 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 LM828M5 meets industry standards.
7.What is the process for return or replacement of LM828M5?
All LM828M5 units undergo pre-shipment inspection (PSI). If there is an issue with LM828M5, 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 LM828M5 part is unused and in its original packaging.
Return procedure for LM828M5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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