My Inquiry
My Account
Texas Instruments LM828M5X
- Part No.:
- LM828M5X
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM828M5X.pdf
- Description:
- IC REG CHARGE PUMP INV SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,110
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM828M5X 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 portable operational amplifier and interface power supplies.
For engineers reviewing the LM828M5X datasheet, LM828M5X pinout, LM828M5X application, or LM828M5X equivalent, this device serves as a low-quiescent-current (40 µA), SOT-23 packaged charge-pump solution for space-constrained battery-powered systems requiring clean, regulated negative rail generation without inductors.
Technical Context
The LM828M5X implements a four-switch CMOS charge-pump topology operating at 12 kHz oscillator frequency (6 kHz switching frequency at CAP+), enabling voltage inversion via two external capacitors. Its internal MOSFET switches are sequenced to alternately charge and transfer energy between C1 (pumping) and C2 (output) capacitors.
Output voltage regulation relies on external component selection: output resistance (ROUT) depends on switch RDS(on), capacitor ESR, and oscillator frequency, while ripple is governed by C2 value and ESR. The device supports cascading for higher negative voltages and paralleling to reduce effective output impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.8V to +5.5V - defines compatible single-cell Li-ion, alkaline, or regulated supply rails. |
| Output Voltage Range | −1.8V to −5.5V - inverted, unregulated output matching input magnitude under no-load conditions. |
| Max Output Current | 25 mA - usable load current before significant voltage droop or thermal derating occurs. |
| Supply Current (No Load) | 40 µA typical - enables ultra-low-power operation in standby or intermittent-use portable devices. |
| Output Impedance | 20 Ω typical at 5 mA - determines load-induced voltage drop and ripple sensitivity to capacitor ESR. |
| Switching Frequency | 6 kHz at CAP+ - sets minimum capacitor size and ripple frequency; lower than inductor-based converters but avoids EMI concerns of MHz switching. |
| Operating Temp Range | −40°C to +85°C - qualified for commercial and industrial ambient environments without derating. |
Pinout & Package
SOT-23 (DBV) 5-pin package, 1.45 mm max height, JEDEC MO-178 compliant, tape-and-reel delivery (3000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Negative voltage output | Delivers inverted output; connects to load return path and output capacitor cathode. |
| 2 (V+) | Positive supply input | Accepts 1.8–5.5V input; must be decoupled near pin to minimize noise coupling into charge pump. |
| 3 (CAP−) | Charge-pump capacitor negative terminal | Connects to negative electrode of C1; forms half of flying capacitor node during charge-transfer phase. |
| 4 (GND) | Ground reference | Common return for V+, OUT, and control logic; requires low-impedance PCB connection to minimize ground bounce. |
| 5 (CAP+) | Charge-pump capacitor positive terminal | Connects to positive electrode of C1; switching node driven at 6 kHz; critical for EMI and layout stability. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage inversion without inductors | Enables compact, low-EMI negative rail generation using only two external capacitors - eliminates magnetic components and associated layout constraints. |
| 20 Ω typical output impedance | Supports stable operation with moderate loads (e.g., op-amp biasing) when paired with low-ESR ceramic or tantalum capacitors. |
| 97% conversion efficiency at 5 mA | Minimizes power loss and thermal rise in battery-critical applications such as handheld instruments and PDAs. |
| 40 µA quiescent current | Extends battery life in always-on or low-duty-cycle systems where negative supply remains active during sleep modes. |
| 12 kHz internal oscillator | Provides predictable timing for capacitor sizing and ripple filtering - avoids external clock dependencies or frequency drift issues. |
Applications
| Operational Amplifier Power Supplies | Interface Power Supplies |
|---|---|
|
Use Scenario: Dual-supply op-amps in portable test equipment require symmetric ± rails from a single positive battery source. IC Role / Device Role / Timing Role: LM828M5X generates the negative rail; operates continuously during measurement cycles with minimal quiescent draw. Use Value: Eliminates need for dual batteries or bulky inductive DC/DC converters - preserves board area and simplifies power architecture. |
Use Scenario: RS-232 or analog front-end ICs demand negative voltage for level-shifting or biasing in handheld data loggers. IC Role / Device Role / Timing Role: LM828M5X provides isolated −3V to −5.5V rail synchronized to system enable signal; no external clock required. Use Value: Enables full-duplex serial communication or sensor biasing without increasing bill-of-materials or PCB layer count. |
| Cellular Phones & Pagers | Handheld Instruments |
|
Use Scenario: RF front-end modules or audio codecs in legacy GSM handsets require low-noise negative bias for analog circuitry. IC Role / Device Role / Timing Role: LM828M5X supplies −2.5V to −4.5V rail during active call or playback; shuts down with host control. Use Value: Delivers clean inversion with <10 mVpp ripple (using 10 µF X7R ceramics), avoiding interference with sensitive RF sections. |
Use Scenario: Digital multimeters and portable oscilloscopes use dual-rail op-amps for signal conditioning and ADC driver stages. IC Role / Device Role / Timing Role: LM828M5X delivers stable −5V rail from 3.3V or 5V main supply; supports fast transient response for AC-coupled inputs. Use Value: Maintains >95% efficiency across 1–20 mA load range - critical for extended runtime on AA/AAA cells or Li-Poly packs. |
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; 17 Ω typical ROUT; requires smaller capacitors but increases EMI risk. | Better suited for high-density layouts needing minimal capacitor footprint; less ideal for ultra-low-noise analog rails. | Select MAX680ESA+ when board space is constrained and ripple filtering can accommodate higher-frequency content. |
| ICL7660SIPAZ | Wider input range (1.5–12V); 35 Ω typical ROUT; 120 µA IQ; SOIC-8 package. | Compatible with higher-voltage battery stacks but consumes >3× more quiescent current and occupies larger area. | Choose ICL7660SIPAZ only if input exceeds 5.5V or SOT-23 footprint is not mandatory. |
Compared with MAX680ESA+ and ICL7660SIPAZ, the LM828M5X offers optimal balance of ultra-low quiescent current, SOT-23 compactness, and mid-frequency switching - making it preferred for portable instrumentation and low-power interface supplies where noise, size, and battery life are co-prioritized.
Availability
LM828M5X is available at Aetrix Electronics and suitable for cellular phones, operational amplifier power supplies, and handheld instruments requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM828M5X 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 digital signal technologies, with decades of expertise in power management innovation.
The LM828M5X belongs to TI's legacy switched-capacitor converter product line, designed specifically for low-noise, inductor-free negative voltage generation in portable and space-constrained electronic systems.
FAQ
What is the maximum continuous output current specification for the LM828M5X?
The LM828M5X supports up to 25 mA of continuous output current under typical conditions. Absolute maximum ratings allow 50 mA peak, but sustained operation above 25 mA may cause excessive voltage droop due to its 20 Ω typical output impedance and thermal limits. For reliable performance in production designs, LM828M5X should be operated within the 25 mA recommended limit with appropriate capacitor selection.
Does the LM828M5X require external timing components or configuration pins?
No, the LM828M5X integrates a fixed 12 kHz oscillator and requires no external resistors, capacitors, or configuration pins for basic inverting operation. Only two external charge-pump capacitors (C1 and C2) are needed - typically 10 µF low-ESR ceramics - making LM828M5X a truly plug-and-play voltage inverter solution.
Can the LM828M5X generate regulated negative output voltage?
By itself, the LM828M5X provides unregulated inverted output. However, it can be combined with an external low-dropout linear regulator like the LP2980 to produce a regulated negative rail (e.g., −3.3V or −5.0V). The LM828M5X supplies the raw inverted voltage, and the LDO handles regulation - a proven method documented in TI's LM828 application notes.
What is the recommended capacitor type and value for stable LM828M5X operation?
Texas Instruments recommends 10 µF ceramic (X7R/X5R), tantalum, or low-ESR aluminum electrolytic capacitors for both C1 (flying) and C2 (output). Ceramic capacitors are preferred for lowest ESR and smallest footprint. Using capacitors with ESR > 0.3 Ω degrades LM828M5X efficiency and increases output impedance beyond the specified 20 Ω typical value.
Is the LM828M5X RoHS-compliant and lead-free?
Yes, the LM828M5X/NOPB.B variant is RoHS-compliant and features Sn (tin) lead finish. It meets JEDEC Level-1 moisture sensitivity requirements and is rated for peak reflow temperatures up to 260°C - fully compatible with standard lead-free PCB assembly processes.
LM828M5X 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
LM828M5X FAQ
1.How can I place an order for LM828M5X through Aetrix?
Please submit a Request for Quotation (RFQ) for LM828M5X 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 LM828M5X reliable?
The price and inventory of LM828M5X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM828M5X is usually 5 days.
3.What payment methods are accepted for LM828M5X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM828M5X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM828M5X?
LM828M5X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM828M5X 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 LM828M5X?
For technical support, including LM828M5X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM828M5X requirements.
6.How does Aetrix verify that LM828M5X is sourced from the original manufacturer or authorized distributors?
All LM828M5X 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 LM828M5X meets industry standards.
7.What is the process for return or replacement of LM828M5X?
All LM828M5X units undergo pre-shipment inspection (PSI). If there is an issue with LM828M5X, 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 LM828M5X part is unused and in its original packaging.
Return procedure for LM828M5X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM828M5X Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
