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Texas Instruments LM828M5/NOPB
- Part No.:
- LM828M5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM828M5/NOPB.pdf
- Description:
- IC REG CHARGE PUMP INV SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,214
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Product details
Overview
LM828M5/NOPB 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, delivers up to 25 mA, features 20 Ω typical output impedance, operates at 12 kHz switching frequency, and targets low-power portable systems requiring dual-rail analog supplies.
For engineers reviewing the LM828M5/NOPB datasheet, LM828M5/NOPB pinout, LM828M5/NOPB application, or LM828M5/NOPB equivalent, this device is evaluated for battery-powered instrumentation, op-amp dual-supply generation, and interface power where ultra-low quiescent current (40 µA) and SOT-23 footprint are critical selection criteria.
Technical Context
The LM828M5/NOPB implements a four-switch charge-pump topology with internal CMOS switches sequenced to invert V+ across two external capacitors. Its oscillator runs at 12 kHz (typ), producing a 6 kHz effective switching frequency at CAP+, enabling predictable ripple and low ESR-dependent output resistance.
Output regulation is unregulated by design: output voltage equals −V+ under no load, dropping linearly with load current per ROUT ≈ 20 Ω (typ). Efficiency remains ≥97% at 5 mA due to low RDS(on) switches and minimal quiescent loss - making it suitable for intermittent-load applications like sensor biasing and LCD contrast control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.8V to +5.5V - supports single-cell Li-ion, alkaline, or regulated 3.3V/5V rails without external LDO pre-regulation. |
| Output Voltage | −V+ (no load); e.g., −5.0V from +5.0V input - fixed inversion ratio, no feedback loop or adjustment pins. |
| Max Output Current | 25 mA - limited by thermal dissipation and output impedance; derates above 85°C ambient. |
| Quiescent Current | 40 µA (typ) - enables >1-year battery life in always-on handheld instruments with 200 mAh coin cells. |
| Switching Frequency | 6 kHz (at CAP+) - balances capacitor size, ESR impact, and output ripple; lower than typical boost converters for reduced EMI. |
| Output Impedance | 20 Ω (typ at 5 mA) - defines load-induced voltage drop (e.g., 100 mV drop at 5 mA); dominated by switch RDS(on) and capacitor ESR. |
| Conversion Efficiency | 97% (typ at 5 mA) - high efficiency achieved via synchronous switching and minimal gate drive loss in CMOS architecture. |
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 output terminal | Delivers inverted voltage; connects to load return path and output capacitor cathode; must not be shorted to V+. |
| 2 (V+) | Positive supply input | Accepts 1.8V–5.5V input; bypass capacitor recommended near pin; maximum absolute rating 5.8V. |
| 3 (CAP−) | Charge-pump capacitor negative node | Connects to negative terminal of flying capacitor C1; forms half of charge-transfer path during pump cycle. |
| 4 (GND) | Ground reference | System ground return; shared with output capacitor anode; requires low-inductance connection to minimize noise. |
| 5 (CAP+) | Charge-pump capacitor positive node | Connects to positive terminal of flying capacitor C1; switching node toggled at 6 kHz; sensitive to layout parasitics. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-ratio voltage inversion | No external resistors or feedback required - simplifies BOM and eliminates trimming for ±VCC generation. |
| Ultra-low quiescent current | 40 µA operation enables use in energy-harvesting or wake-on-event systems where standby power dominates lifetime. |
| SOT-23-5 footprint | Minimizes PCB area vs. discrete inverter solutions; compatible with standard pick-and-place and reflow processes. |
| Internal 12 kHz oscillator | Eliminates need for external timing components; ensures consistent switching behavior across temperature and voltage. |
| 2 kV HBM ESD rating | Enables safe handling in standard assembly environments without special ESD protocols beyond basic grounding. |
Applications
| Operational Amplifier Power Supplies | Handheld Instrumentation |
|---|---|
|
Use Scenario: Dual-supply op-amps in portable multimeters or signal conditioners require symmetric ±2.5V or ±5V rails from a single 5V battery. IC Role / Device Role / Timing Role: LM828M5/NOPB generates clean negative rail; no clock input or synchronization needed - autonomous charge-pump operation. Use Value: Eliminates need for bulky inductors or second battery; 20 Ω output impedance supports ≤10 mA op-amp quiescent loads with <200 mV dropout. |
Use Scenario: Portable gas analyzers or pH meters use low-noise analog front-ends requiring isolated negative bias for sensor excitation. IC Role / Device Role / Timing Role: LM828M5/NOPB serves as compact, low-power negative bias source; operates continuously during measurement cycles. Use Value: 40 µA quiescent current extends AA/AAA battery life to >18 months in devices drawing <100 µA average system current. |
| Interface Power Supplies | Cellular Phone Peripherals |
|
Use Scenario: RS-232 or MAX232-compatible level shifters in industrial IoT gateways need −3V to −5.5V for driver stages. IC Role / Device Role / Timing Role: LM828M5/NOPB provides dedicated negative rail; decoupled from main system regulator to reduce noise coupling. Use Value: 97% efficiency at 5 mA minimizes heat rise in sealed enclosures; SOT-23 placement avoids routing high-frequency CAP+ traces near analog sections. |
Use Scenario: Feature phones or legacy mobile accessories (e.g., FM transmitters) require −2.7V for RF amplifier bias from 3.6V Li-ion. IC Role / Device Role / Timing Role: LM828M5/NOPB acts as dedicated inverter for RF subsystem; enabled only during transmission bursts. Use Value: Fast turn-on (<10 µs) and no startup sequencing allow immediate rail availability; 50 mA absolute max rating protects against transient overloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Higher 100 kHz switching frequency; 3.5 mA quiescent current; ±5V output from +5V input only. | Better ripple performance with smaller capacitors; unsuitable for 1.8V–3.3V input range. | Select when low-ESR ceramic caps are preferred and input is fixed at 5V. |
| ICL7660ACPA+ | Wider −1.5V to −10V output range; 170 µA quiescent current; 35 Ω output impedance. | Supports higher voltage inversion but consumes >4× more quiescent power and delivers lower output current. | Select when input exceeds 5.5V or cost sensitivity outweighs efficiency and size constraints. |
Compared with MAX680ESA+ and ICL7660ACPA+, the LM828M5/NOPB offers optimal balance of ultra-low IQ, wide 1.8V–5.5V input compatibility, and SOT-23 footprint - making it the preferred choice for space-constrained, battery-critical designs needing reliable −V+ inversion without external timing or feedback components.
Availability
LM828M5/NOPB is available at Aetrix Electronics and suitable for cellular phone peripherals, handheld instrumentation, operational amplifier power supplies, and interface power supplies requiring stable component supply across long-lifecycle consumer and industrial programs.
Supply support for LM828M5/NOPB 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, scalability, and broad technical support.
The LM828M5/NOPB belongs to TI's legacy precision analog power management portfolio, designed specifically for compact, low-quiescent-current DC/DC voltage inversion in portable and battery-operated systems.
FAQ
What is the minimum input voltage supported by the LM828M5/NOPB?
The LM828M5/NOPB supports a minimum input voltage of +1.8V, enabling operation directly from single-cell lithium polymer or alkaline batteries without pre-regulation. Below 1.8V, the internal oscillator fails to sustain switching, and output collapses. This specification is confirmed in the Electrical Characteristics table under "Supply Voltage" with Min = 1.8V at TJ = 25°C.
Can the LM828M5/NOPB generate regulated output voltage?
No, the LM828M5/NOPB is an unregulated charge-pump inverter - its output voltage equals −V+ under no load and drops linearly with load current per its 20 Ω typical output impedance. To achieve regulation, TI recommends cascading with an LDO such as the LP2980, as documented in Figure 16 of the LM828M5/NOPB datasheet.
What capacitor types are recommended for use with the LM828M5/NOPB?
Texas Instruments recommends low-ESR capacitors: ceramic (Murata, Taiyo Yuden), tantalum (AVX TPS, Sprague 593D), or OS-CON aluminum (Sanyo). High-ESR electrolytics increase output impedance and ripple; the datasheet specifies 10 µF/0.3Ω max ESR for C1 and C2 in test conditions, and Equation (1) shows ESR contributes directly to ROUT.
Is the LM828M5/NOPB pin-compatible with other SOT-23-5 voltage inverters?
No documented pin compatibility exists between LM828M5/NOPB and other SOT-23-5 inverters (e.g., MAX680, ICL7660). Pin 3 (CAP−) and Pin 5 (CAP+) have unique charge-pump node assignments; swapping devices without verifying pin function mapping risks circuit malfunction or damage.
What is the maximum continuous output current of the LM828M5/NOPB?
The LM828M5/NOPB delivers up to 25 mA of continuous output current under typical conditions (TA = 25°C, V+ = 5V). At higher temperatures or lower input voltages, output current must be derated per thermal limits - the Absolute Maximum Rating specifies 50 mA peak, but sustained operation above 25 mA risks exceeding 150°C junction temperature.
LM828M5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM828M5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM828M5/NOPB 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/NOPB reliable?
The price and inventory of LM828M5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM828M5/NOPB is usually 5 days.
3.What payment methods are accepted for LM828M5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM828M5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM828M5/NOPB?
LM828M5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM828M5/NOPB 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/NOPB?
For technical support, including LM828M5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM828M5/NOPB requirements.
6.How does Aetrix verify that LM828M5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM828M5/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM828M5/NOPB?
All LM828M5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM828M5/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM828M5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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