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Analog Devices Inc./Maxim Integrated MAX1853EXT+T
- Part No.:
- MAX1853EXT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
MAX1853EXT+T.pdf
- Description:
- IC REG CHRG PUMP INV 30MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:9,540
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Product details
Overview
MAX1853EXT+T from Maxim Integrated is a monolithic CMOS inverting charge-pump voltage converter in a 6-pin SC70 package, delivering -1×VIN output with up to 30mA load current, 15Ω output resistance, and 200kHz switching frequency. It operates from +2.5V to +5.5V input and is used to generate negative supplies for analog circuitry from single positive logic rails.
For engineers reviewing the MAX1853EXT+T datasheet, MAX1853EXT+T pinout, MAX1853EXT+T application, or MAX1853EXT+T equivalent, key selection criteria include shutdown quiescent current (≤0.5µA), output resistance stability over temperature, capacitor count (only two 0.68µF required), and SC70 footprint compatibility in space-constrained portable designs.
Technical Context
The MAX1853EXT+T integrates four on-chip power-MOSFET switches and oscillator control circuitry to implement a two-phase switched-capacitor inverter topology. It achieves fixed -1×VIN conversion ratio using external flying (C1) and reservoir (C2) capacitors, with internal slew-rate limiting to reduce EMI.
Its 200kHz oscillator frequency enables smaller external capacitors than the 50kHz MAX1852 variant, while maintaining identical 6-pin SC70 package dimensions and pinout. Shutdown is controlled by a logic-level SHDN input that reduces supply current to ≤0.5µA at +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.5V to +5.5V - supports direct connection to 3.3V and 5V logic rails without regulation. |
| Output Current | 30mA RMS - sufficient to power op-amps, ADC bias networks, or small LCD bias circuits. |
| Output Resistance | 15Ω typical at +25°C - ensures <150mV drop at 10mA load, critical for stable negative rail regulation. |
| Switching Frequency | 200kHz - allows use of compact 0.68µF ceramic capacitors (C1/C2) instead of larger values. |
| Shutdown Current | ≤0.5µA at +85°C - extends battery life in handheld devices during sleep mode. |
| Efficiency | 99% at no load - minimizes quiescent loss in low-power systems; drops to ~85% at 30mA due to ROUT losses. |
| Operating Temp | -40°C to +85°C - qualified for industrial and portable consumer environments. |
Pinout & Package
Package: 6-pin SC70 (2.0mm × 1.25mm × 0.9mm height), 40% smaller than SOT23, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+ | Positive terminal of flying capacitor | Connects to top plate of C1 during charging phase; must be routed with low-inductance path. |
| C1- | Negative terminal of flying capacitor | Connects to bottom plate of C1; forms charge-transfer node between phases. |
| IN | Positive input supply | Accepts +2.5V to +5.5V; requires local 0.68µF bypass capacitor (C3) if noisy source. |
| SHDN | Logic-controlled shutdown enable | Active-high: >0.7×VIN = normal operation; <0.3×VIN = shutdown (≤0.5µA IQ). |
| OUT | Inverted output (–VIN) | Delivers regulated negative voltage; connects to reservoir capacitor C2 and load return. |
| GND | Ground reference | System ground plane connection point; must be low-impedance for noise control and efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70 package | Enables integration into space-limited PDAs, handheld terminals, and wearable sensors where board area is constrained. |
| 200kHz fixed-frequency oscillator | Reduces required flying/reservoir capacitance by 4× vs. 50kHz MAX1852, lowering BOM cost and footprint. |
| Slew-rate limited switching | Minimizes high-frequency EMI emissions, easing EMC compliance in sensitive RF or audio subsystems. |
| Two-component solution | Only two 0.68µF ceramic capacitors needed - eliminates need for inductors or complex feedback networks. |
| Logic-compatible shutdown | Direct interface with microcontroller GPIO pins without level-shifting, simplifying power sequencing. |
Applications
| Negative Supply Generation | Small LCD Panel Bias |
|---|---|
Use Scenario: Generating –3.3V or –5V rail from existing +3.3V or +5V logic supply to power op-amps, comparators, or data converters. IC Role / Device Role / Timing Role: Inverting charge-pump voltage converter providing isolated negative bias without inductors. Use Value: Eliminates need for dual-output DC/DC or transformer-based solutions, reducing component count and EMI. | Use Scenario: Providing gate drive or common-electrode bias voltage for monochrome or segment LCDs in portable meters or medical displays. IC Role / Device Role / Timing Role: Low-noise, low-current inverter supplying stable –2.5V to –5V for LCD contrast control. Use Value: Enables crisp display contrast with only two external capacitors and minimal PCB area in ultra-thin form factors. |
| GaAsFET Bias Supply | Battery-Operated Equipment |
Use Scenario: Delivering precise negative gate bias (e.g., –2V to –5V) for GaAs FET amplifiers in RF front-ends of handheld radios or test equipment. IC Role / Device Role / Timing Role: Low-ripple, low-ESR inverter supporting fast transient response required for RF amplifier stability. Use Value: Maintains tight gate voltage control under dynamic load, preventing gain compression or oscillation. | Use Scenario: Powering analog sensor signal chains or low-power microcontrollers in coin-cell or AA-powered IoT sensors and remote controls. IC Role / Device Role / Timing Role: Micropower inverter enabling full-system shutdown with sub-µA quiescent draw. Use Value: Extends battery life beyond 5 years in always-on sensing applications via 0.5µA shutdown current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting charge-pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1852EXT+T | 50kHz switching frequency; requires 4.7µF capacitors for 15Ω ROUT | Better light-load efficiency; higher output impedance at 200kHz loads | Select when lowest quiescent current (68µA) and lower EMI at expense of capacitor size are priorities. |
| TPS60403DBVR | 250kHz, 30mA, 17Ω ROUT, same 6-pin SOT-23 package | Higher input voltage limit (+6V), integrated soft-start, no external C1 polarity sensitivity | Choose when compatibility with 6V inputs or simplified layout (no C1 polarity concerns) is required. |
Compared with MAX1852EXT+T and TPS60403DBVR, the MAX1853EXT+T offers optimal capacitor size reduction for 200kHz operation while retaining the smallest SC70 footprint-ideal for ultra-dense layouts where 0.68µF ceramics fit but 4.7µF do not.
Availability
MAX1853EXT+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial handheld terminals requiring stable component supply and long-term lifecycle support.
Supply support for MAX1853EXT+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) designs precision analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX1852/MAX1853 product line delivers ultra-compact, low-quiescent-current inverting charge pumps optimized for space- and power-constrained portable electronics needing clean negative rails.
FAQ
What is the maximum continuous output current of the MAX1853EXT+T?
The MAX1853EXT+T delivers up to 30mA RMS continuous output current. This rating is validated across the full operating temperature range (-40°C to +85°C) and input voltage range (+2.5V to +5.5V). At 30mA, output voltage drops due to 15Ω output resistance - e.g., –4.55V output from +5V input - making it suitable for moderate analog loads like op-amp biasing or LCD segment drivers, but not high-current digital logic.
Does the MAX1853EXT+T require polarity-sensitive external capacitors?
Yes, the MAX1853EXT+T requires correct polarity for the flying capacitor (C1): C1+ must connect to the C1+ pin and C1– to the C1– pin. Reversing C1 polarity prevents proper charge transfer and causes failure to generate output voltage. The reservoir capacitor (C2) is non-polarized and typically uses ceramic or tantalum types rated for negative voltage swing.
Can the MAX1853EXT+T be used with input voltages below 2.5V?
No, the MAX1853EXT+T is not specified or guaranteed for operation below +2.5V input. Absolute maximum ratings allow IN to GND down to –0.3V, but functional operation begins at +2.5V per Electrical Characteristics table. Below this threshold, oscillator startup fails, output regulation collapses, and shutdown logic becomes unreliable - confirmed by production testing and thermal derating limits.
How does the MAX1853EXT+T minimize electromagnetic interference?
The MAX1853EXT+T incorporates internal slew-rate limiting on all MOSFET gate drives to suppress fast voltage transitions, directly reducing high-frequency harmonic content in switching waveforms. This design choice lowers radiated EMI by >10dB compared to unslew-limited charge pumps, easing compliance with CISPR 22 Class B limits in handheld devices without added ferrite beads or shielding.
Is the SC70 package of the MAX1853EXT+T lead-free and RoHS-compliant?
Yes, the MAX1853EXT+T SC70 package is lead-free and RoHS-compliant per Maxim Integrated's standard product specifications. The "+T" suffix denotes tape-and-reel packaging with Pb-free terminations and halogen-free molding compound, qualified to JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for unlimited floor life at ≤30°C/60% RH.
MAX1853EXT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 30mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
MAX1853EXT+T FAQ
1.How can I place an order for MAX1853EXT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1853EXT+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 MAX1853EXT+T reliable?
The price and inventory of MAX1853EXT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1853EXT+T is usually 5 days.
3.What payment methods are accepted for MAX1853EXT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1853EXT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1853EXT+T?
MAX1853EXT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1853EXT+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 MAX1853EXT+T?
For technical support, including MAX1853EXT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1853EXT+T requirements.
6.How does Aetrix verify that MAX1853EXT+T is sourced from the original manufacturer or authorized distributors?
All MAX1853EXT+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 MAX1853EXT+T meets industry standards.
7.What is the process for return or replacement of MAX1853EXT+T?
All MAX1853EXT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1853EXT+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 MAX1853EXT+T part is unused and in its original packaging.
Return procedure for MAX1853EXT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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