My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX829EUK+T
- Part No.:
- MAX829EUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX829EUK+T.pdf
- Description:
- IC REG CHARGE PUMP INV SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,899
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX829EUK+T from Maxim Integrated is a monolithic CMOS switched-capacitor voltage inverter that converts +1.5V to +5.5V input to a regulated negative output, operates at 35kHz oscillator frequency, delivers up to 25mA with ≤500mV voltage drop at full load, and achieves 95% voltage conversion efficiency - ideal for generating -5V from +5V logic rails in space-constrained portable analog systems.
For engineers reviewing the MAX829EUK+T datasheet, MAX829EUK+T pinout, MAX829EUK+T application, or MAX829EUK+T equivalent, key selection criteria include its SOT23-5 footprint, 35kHz switching frequency enabling smaller external capacitors, low 60µA quiescent current (typ), and guaranteed -40°C to +85°C operation without thermal derating.
Technical Context
The MAX829EUK+T implements a two-phase charge-pump topology using four on-chip power MOSFET switches and integrated oscillator control. It requires only two external flying and reservoir capacitors (C1 = C2 = 3.3µF) to invert input voltage without inductors or transformers.
Its output impedance is dominated by internal switch resistance (~8–9Ω) and capacitor ESR, resulting in ~65Ω typical output resistance at +25°C and VIN = +5V. Output voltage droop follows VOUT = –(VIN – IOUT × RS–), where RS– is load-dependent and rises with temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 35kHz (typ); enables use of smaller 3.3µF external capacitors vs. MAX828's 10µF requirement |
| Input Voltage Range | +1.5V to +5.5V (min/max); supports single-cell Li-ion, 3.3V, and 5V logic supplies |
| Output Current | 25mA (max at ≤500mV drop); sufficient for op-amp biasing and small LCD bias rails |
| Voltage Conversion Efficiency | 95% (typ at light load); minimizes battery drain in portable equipment |
| Quiescent Supply Current | 60µA (typ); enables >1-year battery life in always-on sensor nodes |
| Operating Temperature | -40°C to +85°C (guaranteed); qualified for industrial and medical environments |
| Output Resistance | 65Ω (typ at +25°C, VIN = +5V); defines load regulation slope and voltage droop under load |
Pinout & Package
MAX829EUK+T is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, with exposed pad not connected (substrate tied to IN). Pin 1 is marked with dot; top mark "AABJ".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Inverting charge-pump output | Delivers negative voltage rail; connects to reservoir capacitor C2 and load; must be decoupled locally |
| 2 - IN | Positive power-supply input | Accepts +1.5V to +5.5V; substrate tied to this pin; requires 0.1µF bypass if loaded from IN-to-OUT |
| 3 - C1- | Flying capacitor negative terminal | Connects to negative side of flying capacitor C1; critical path for charge transfer; minimize trace inductance |
| 4 - GND | Ground reference | System ground return; must connect to low-impedance ground plane; not isolated from substrate |
| 5 - C1+ | Flying capacitor positive terminal | Connects to positive side of flying capacitor C1; switches between IN and OUT phases; high di/dt node |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT23-5 footprint | Enables integration into handheld devices < 100mm² PCB area; no layout rework needed vs. SO-8 alternatives |
| 35kHz fixed-frequency operation | Reduces required flying capacitance to 3.3µF (vs. 10µF for MAX828), cutting BOM cost and board space |
| 95% voltage conversion efficiency | Limits power loss to <1.25mW at 5mA load, critical for coin-cell-powered instrumentation |
| Only two external capacitors required | Eliminates inductors and regulators; simplifies design validation and reduces component count by ≥3 vs. buck-boost solutions |
| Guaranteed -40°C to +85°C performance | All electrical specs validated across full range; no derating needed for medical or automotive interior applications |
Applications
| Small LCD Panels | Cell Phones |
|---|---|
Use Scenario: Biasing STN or segment LCDs requiring -3V to -5V VEE rail in compact handheld displays. IC Role / Device Role / Timing Role: Voltage inverter generating stable negative supply from main 3.3V system rail. Use Value: Enables true 5V-compatible LCD contrast control with <500mV droop at 15mA, eliminating need for discrete charge-pump ICs or transformers. |
Use Scenario: Powering RF front-end analog circuitry (e.g., LNA bias, mixer LO injection) from shared 3.3V/5V battery rail. IC Role / Device Role / Timing Role: Low-noise negative supply generator with 35kHz switching frequency placed away from sensitive RF sections. Use Value: Delivers clean -3.3V at 10mA with <20mVp-p ripple (at 3.3µF caps), avoiding interference with GSM/UMTS receive bands. |
| Medical Instruments | Battery-Operated Equipment |
Use Scenario: Providing isolated negative bias for precision op-amps and ADC drivers in portable ECG or glucose meters. IC Role / Device Role / Timing Role: Low-quiescent-current inverter supporting ultra-low-power sleep modes while maintaining analog signal chain integrity. Use Value: 60µA IQ enables >2-year shelf life on CR2032; output stability ±2% over -20°C to +70°C ensures clinical-grade measurement accuracy. |
Use Scenario: Generating dual-rail supplies (+3.3V/–3.3V) for portable data loggers using single 3.3V LiPo cell. IC Role / Device Role / Timing Role: Primary negative rail generator in compact, battery-limited systems where size and efficiency are co-constrained. Use Value: Achieves 25mA output at 1.8V input (down to 1.5V min), extending usable battery range by 18% vs. 2.0V-cutoff competitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX828EUK+T | 12kHz oscillator; requires 10µF external capacitors; 60µA IQ same; 25mA output same | Better low-noise performance at cost of larger caps and lower efficiency above 10mA | Select when EMI sensitivity outweighs board space constraints and load exceeds 15mA |
| MAX860ESA+ | Higher 50mA output; µMAX-8 package; 600mV dropout; 90% efficiency; 12kHz oscillator | Supports heavier loads but consumes 2.5× PCB area and lacks SOT23-5 compatibility | Select when output current >25mA is required and footprint flexibility exists |
Compared with MAX829EUK+T, the MAX828EUK+T trades higher capacitor size and lower switching frequency for marginally better noise performance, while the MAX860ESA+ sacrifices miniaturization for doubled current capability - making MAX829EUK+T optimal for space- and efficiency-critical 25mA-class portable designs.
Availability
MAX829EUK+T is available at Aetrix Electronics and suitable for small LCD panels, cell phones, medical instruments, and battery-operated equipment requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX829EUK+T 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
Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX828/MAX829 family was designed specifically for ultra-compact, high-efficiency DC-DC voltage inversion in battery-powered portable electronics - prioritizing minimal external components, low quiescent current, and SOT23-5 integration.
FAQ
What is the minimum input voltage required for reliable operation of the MAX829EUK+T?
The MAX829EUK+T guarantees operation down to +1.5V input across its full -40°C to +85°C temperature range. At 1.5V, it delivers up to 10mA with acceptable droop; full 25mA output is specified at VIN ≥ 2.0V. This makes MAX829EUK+T suitable for single alkaline or NiMH cells nearing end-of-life.
Can the MAX829EUK+T be used to generate a regulated -5V output from a +5V supply?
Yes - the MAX829EUK+T inverts the input supply, so with VIN = +5V, it produces approximately -5V under light load. However, due to 65Ω typical output resistance, VOUT drops to ~-4.5V at 25mA (500mV droop). For tighter regulation, add an external low-dropout linear regulator after MAX829EUK+T.
What capacitor values and types are recommended for the MAX829EUK+T?
Use 3.3µF X5R or X7R ceramic capacitors for both C1 (flying) and C2 (reservoir), with ≤100mΩ ESR. Low-ESR tantalum or polymer caps (e.g., AVX TPS series) are acceptable if ceramic is unavailable. Avoid high-ESR electrolytics - they increase output resistance and ripple beyond spec.
Is the MAX829EUK+T pin-compatible with the MAX828EUK+T?
Yes - MAX829EUK+T and MAX828EUK+T share identical 5-pin SOT23-5 pinout, package dimensions, and terminal functions. They differ only in oscillator frequency (35kHz vs. 12kHz) and recommended capacitor values (3.3µF vs. 10µF), allowing direct substitution where frequency and capacitor constraints permit.
Does the MAX829EUK+T include built-in shutdown control?
No - the MAX829EUK+T has no enable/shutdown pin. To implement logic-controlled shutdown, use the external circuit in Figure 8 of the datasheet: drive the IN pin via a buffer controlled by a digital signal, with a 0.1µF capacitor at IN to absorb transients. This adds minimal components but avoids redesigning around MAX1719/MAX1720.
MAX829EUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- 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):
- 1.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 25mA
- Frequency - Switching:
- 35kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX829EUK+T FAQ
1.How can I place an order for MAX829EUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX829EUK+T 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 MAX829EUK+T reliable?
The price and inventory of MAX829EUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX829EUK+T is usually 5 days.
3.What payment methods are accepted for MAX829EUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX829EUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX829EUK+T?
MAX829EUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX829EUK+T 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 MAX829EUK+T?
For technical support, including MAX829EUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX829EUK+T requirements.
6.How does Aetrix verify that MAX829EUK+T is sourced from the original manufacturer or authorized distributors?
All MAX829EUK+T 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 MAX829EUK+T meets industry standards.
7.What is the process for return or replacement of MAX829EUK+T?
All MAX829EUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX829EUK+T, 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 MAX829EUK+T part is unused and in its original packaging.
Return procedure for MAX829EUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX829EUK+T 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…
