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Analog Devices Inc./Maxim Integrated MAX1684EEE+T
- Part No.:
- MAX1684EEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1684EEE+T.pdf
- Description:
- IC REG BUCK ADJ/1.25V 1A 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,008
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Product details
Overview
MAX1684EEE+T from Maxim Integrated is a high-efficiency, internal-switch, 300kHz PWM step-down DC-DC converter delivering 1A output current from 2.7V–14V input, with fixed 3.3V (±1%) or adjustable 1.25V–VIN output. It integrates a 0.24Ω P-channel MOSFET, synchronous rectifier, and 1% accurate 1.25V reference, targeting power management in battery-powered handheld devices requiring low-noise regulation and dropout operation.
For engineers reviewing the MAX1684EEE+T datasheet, MAX1684EEE+T pinout, MAX1684EEE+T application, or MAX1684EEE+T equivalent, this page delivers verified electrical parameters, validated operating modes (PWM/normal/low-power/shutdown), package mapping to 16-QSOP, and confirmed alternative parts for portable power design validation.
Technical Context
The MAX1684EEE+T employs current-mode PWM control with oscillator-triggered minimum/maximum on-time (220ns min, 2/fOSC max), enabling cycle-by-cycle current limiting and stable regulation across 0–1A load. Its dual-mode feedback supports both fixed 3.3V output (FB tied to AGND) and externally adjustable output (FB via resistor divider), with 100% duty-cycle capability for ultra-low dropout.
Internal regulators supply CVL (3V/5mA) and CVH (−4.6V w.r.t. IN); BOOT must be connected to VOUT for VOUT ≤ 5.5V to enable bootstrap operation and reduce quiescent current by VOUT/VIN scaling. Synchronization via SYNC/PWM pin allows external clock locking at 300kHz ±10%, critical for EMI-sensitive RF subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 14V - supports two Li+ batteries and wall-cube charging without input voltage interruption |
| Output Voltage | Fixed 3.3V ±1% or adjustable 1.25V to VIN - enables direct logic rail generation or custom voltage scaling |
| Max Output Current | 1A continuous - guaranteed delivery under full thermal and voltage conditions per datasheet test setup |
| Switching Frequency | 300kHz fixed - optimized for high efficiency and reduced EMI vs. higher-frequency alternatives |
| Efficiency | Up to 96% - achieved via 0.24Ω P-channel switch and integrated synchronous rectifier |
| Quiescent Current | 150µA (normal mode), 25µA (low-power mode), 2µA (shutdown) - enables long standby in portable systems |
| Reference Accuracy | ±1% at 1.25V - ensures tight output regulation without external trimming components |
Pinout & Package
MAX1684EEE+T is housed in a 16-pin QSOP package (5.0mm × 6.2mm, 0.65mm pitch), thermally rated for −40°C to +85°C operation. Pin functions are validated per Maxim's official datasheet Rev 2 (19-1454).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power Input | Main supply input (2.7V–14V); connects to battery or adapter; bypassed to PGND with 0.1µF capacitor |
| LX (13,14) | Switch Node | Drain of internal P-channel MOSFET; connects to inductor; carries high di/dt switching current |
| FB | Feedback Input | Sets output: tie to AGND for 3.3V mode; connect to resistor divider for adjustable output |
| BOOT | Bootstrap Supply | Connect to VOUT if VOUT ≤ 5.5V to power internal gate driver and reduce IQ; otherwise tie to AGND |
| SHDN | Active-Low Enable | Pull low to disable regulator; withstands full VIN; draws only 2µA in shutdown |
| SYNC/PWM | Mode Control | Tie to CVL for PWM mode (300kHz fixed); tie to AGND for normal mode (PFM at light loads) |
| STBY | Standby Override | Tie to AGND to force low-power mode regardless of SYNC/PWM state |
| CVL | Auxiliary Regulator | 3V/5mA output for external logic; disabled in shutdown; used as bias for SYNC/PWM and STBY |
| REF | Reference Output | 1.25V ±1% precision reference; supplies up to 10µA; bypassed to AGND with 0.1µF |
| CC | Compensation Node | Integrator capacitor connection (0.01µF to AGND); sets loop stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty-Cycle Operation | Enables dropout voltage as low as IOUT × RDS(ON) ≈ 350mV at 1A, critical for Li+ battery end-of-discharge |
| Synchronizable 300kHz PWM | Reduces conducted EMI in cellular radios and PDAs by aligning switching edges with system clocks |
| Dual-Mode Output Selection | Eliminates external resistors for 3.3V rails while retaining flexibility for non-standard voltages via FB divider |
| Integrated CVL Regulator | Provides 3V/5mA auxiliary supply-reduces need for discrete LDOs in multi-rail handheld designs |
| Low-Power Mode Quiescent Current | 25µA draw extends battery life during standby without sacrificing fast wake-up capability |
Applications
| Cellular Phones | Two-Way Radios |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from dual Li+ cells during transmit/receive cycles. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3V at up to 1A with <100mV load-transient deviation. Use Value: 96% peak efficiency and 300kHz fixed frequency minimize heat and EMI interference with sensitive RF front-end. |
Use Scenario: Supplying microcontroller, audio codec, and PA bias in handheld walkie-talkies with intermittent voice traffic. IC Role / Device Role / Timing Role: Main power IC operating in low-power mode between transmissions to extend battery runtime. Use Value: 25µA quiescent current and fast transition from standby to full-load ensure instant channel access without delay. |
| PDAs and Handy-Terminals | Computer Peripherals |
Use Scenario: Generating core logic voltage for ARM-based PDA SoC with dynamic CPU frequency scaling. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting multiple voltage domains (1.8V, 2.5V, 3.3V) via FB divider. Use Value: 1.25V reference accuracy and 0.01% DC load regulation maintain SoC stability across temperature and load variation. |
Use Scenario: Powering USB-connected peripherals (e.g., card readers, barcode scanners) from variable-input wall adapters. IC Role / Device Role / Timing Role: Input-flexible regulator accepting 5V–14V adapter inputs while delivering regulated 3.3V to digital interface ICs. Use Value: 14V absolute maximum rating and robust overvoltage protection prevent damage during adapter hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1685EEE+T | 600kHz switching frequency; smaller external inductors/capacitors; identical pinout and feature set | Better suited for space-constrained designs where component size outweighs EMI concerns | Select MAX1685EEE+T when board area is critical and higher-frequency noise can be filtered locally |
| MAX1692EUA+T | 10-pin µMAX package; max 5.5V input; lower IQ (12µA); no CVL output or BOOT pin | Targeted at low-voltage single-cell Li+ or USB-powered devices, not dual-cell or wall-adapter systems | Choose MAX1692EUA+T only for ≤5.5V input applications where auxiliary 3V rail and bootstrap are unnecessary |
Compared with MAX1684EEE+T, MAX1685EEE+T trades lower EMI for smaller passives, while MAX1692EUA+T sacrifices input range and integrated features for compactness and ultra-low IQ-making each viable only within its validated voltage, footprint, and functionality envelope.
Availability
MAX1684EEE+T is available at Aetrix Electronics and suitable for cellular phones, two-way radios, PDAs, and computer peripherals requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX1684EEE+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding applications.
The MAX1684EEE+T belongs to Maxim's low-noise, high-efficiency DC-DC converter product line, engineered specifically for battery-powered handheld communication devices needing reliable 1A regulation with minimal EMI and extended standby life.
FAQ
What is the maximum input voltage rating for MAX1684EEE+T?
The MAX1684EEE+T has an absolute maximum input voltage of 15V, with recommended continuous operation up to 14V. This allows safe use with two lithium-ion batteries (8.4V fully charged) plus margin for transient spikes during wall-cube charging. Exceeding 15V risks permanent damage per Absolute Maximum Ratings table.
Can MAX1684EEE+T operate in dropout mode, and what is the typical dropout voltage?
Yes, MAX1684EEE+T supports 100% duty-cycle operation for dropout. At 1A output, typical dropout voltage is ~350mV, calculated as IOUT × RDS(ON) (0.24Ω) plus inductor DCR contribution. This enables regulation down to VIN = VOUT + 0.35V, critical for maintaining function near battery exhaustion.
How does the SYNC/PWM pin configure operating modes on MAX1684EEE+T?
On MAX1684EEE+T, tying SYNC/PWM to CVL selects fixed-frequency PWM mode (300kHz); grounding it enables normal mode (PFM at light loads, PWM above ~150mA). The STBY pin overrides this: grounding STBY forces low-power mode regardless of SYNC/PWM state, reducing IQ to 25µA.
Is an external Schottky diode required when using MAX1684EEE+T?
No external Schottky diode is required for basic operation because MAX1684EEE+T includes an internal N-channel synchronous rectifier. However, the datasheet recommends an external Schottky (e.g., MBRS130LT3) in parallel with the inductor for improved efficiency at heavy loads and to handle reverse-current blocking during light-load PFM operation.
What is the purpose of the BOOT pin on MAX1684EEE+T, and how should it be connected?
The BOOT pin on MAX1684EEE+T provides gate-drive bias for the internal P-channel MOSFET. For VOUT ≤ 5.5V, connect BOOT directly to VOUT to enable bootstrap operation and reduce input quiescent current. For VOUT > 5.5V, tie BOOT to AGND to avoid overstress; the internal VL regulator then supplies CVL at 3V.
MAX1684EEE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 1.25V (3.3V)
- Voltage - Output (Max):
- 14V
- Current - Output:
- 1A
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX1684EEE+T FAQ
1.How can I place an order for MAX1684EEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1684EEE+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 MAX1684EEE+T reliable?
The price and inventory of MAX1684EEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1684EEE+T is usually 5 days.
3.What payment methods are accepted for MAX1684EEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1684EEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1684EEE+T?
MAX1684EEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1684EEE+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 MAX1684EEE+T?
For technical support, including MAX1684EEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1684EEE+T requirements.
6.How does Aetrix verify that MAX1684EEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1684EEE+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 MAX1684EEE+T meets industry standards.
7.What is the process for return or replacement of MAX1684EEE+T?
All MAX1684EEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1684EEE+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 MAX1684EEE+T part is unused and in its original packaging.
Return procedure for MAX1684EEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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