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Analog Devices Inc./Maxim Integrated MAX1684EEE
- Part No.:
- MAX1684EEE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1684EEE.pdf
- Description:
- IC REG BUCK ADJ/1.25V 1A 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,345
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Product details
Overview
MAX1684EEE from Maxim Integrated is a high-efficiency, internal-switch, pulse-width modulation (PWM) step-down DC-DC converter optimized for portable battery-powered systems. It delivers a guaranteed 1A output current from 2.7V–14V input, features fixed 3.3V ±1% output or adjustable 1.25V–VIN operation, operates at 300kHz switching frequency, and integrates synchronous rectification with 0.24Ω P-channel on-resistance for up to 96% efficiency in cellular phone power rails.
For engineers reviewing the MAX1684EEE datasheet, MAX1684EEE pinout, MAX1684EEE application, or MAX1684EEE equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (fixed-frequency PWM, normal, low-power, shutdown), real-world load-transient performance data, and precise package mapping to 16-QSOP - all critical for portable power design validation and BOM selection.
Technical Context
The MAX1684EEE uses current-mode PWM control with oscillator-triggered minimum/maximum on-time regulation, enabling cycle-by-cycle current limiting and fast line/load transient response. Its 300kHz fixed-frequency operation minimizes EMI in RF-sensitive applications like cellular handsets, while 100% duty-cycle capability supports low-dropout operation down to VIN ≈ VOUT + 0.35V at 1A.
It integrates dual internal regulators: a -4.6V VH supply (referenced to IN) for P-channel gate drive and a 3V/5mA CVL output for logic and N-channel drive. Bootstrap operation (BOOT tied to VOUT) reduces quiescent current by VOUT/VIN scaling, and SYNC/PWM pin enables external clock synchronization or mode selection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 14V - supports two Li+ batteries plus wall adapter input during charging, with 15V absolute max rating. |
| Output Current | 1A guaranteed - sufficient for baseband processors and RF transceivers in handheld terminals. |
| Switching Frequency | 300kHz - balances efficiency and external component size; lower than MAX1685's 600kHz for reduced EMI in noise-critical comms gear. |
| Output Voltage Options | Fixed 3.3V ±1% or adjustable 1.25V–VIN - dual-mode flexibility enables direct replacement of legacy LDOs or custom rail generation. |
| Efficiency | Up to 96% - achieved via integrated 0.24Ω P-channel switch and synchronous rectifier, reducing thermal load in space-constrained PCBs. |
| Quiescent Current | 150µA (normal mode), 25µA (low-power mode), 2µA (shutdown) - extends battery life in standby and sleep states. |
| Reference Accuracy | ±1% (1.251V typical) - ensures tight output regulation across temperature and load for precision analog subsystems. |
Pinout & Package
MAX1684EEE is housed in a 16-pin QSOP package (5.0mm × 6.2mm, 0.65mm pitch), optimized for compact portable designs with thermal pad omitted. Pin functions are validated per Maxim's official datasheet Rev 2 (July 2001).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 3) | Power input supply | Accepts 2.7V–14V; connects to battery or adapter; bypassed to PGND with 0.1µF capacitor. |
| LX (Pins 13,14) | Switch node | Drain of internal P-channel MOSFET; connects to inductor and Schottky diode cathode. |
| FB (Pin 7) | Feedback input | Sets output: tie to AGND for 3.3V mode; connect resistor divider for adjustable output (1.25V–VIN). |
| SHDN (Pin 15) | Active-low enable | Pulls low to enter 2µA shutdown; tolerates full VIN voltage, enabling direct microcontroller control. |
| SYNC/PWM (Pin 9) | Mode control | Tie to CVL for PWM mode; to AGND for normal mode; drive with TTL square wave for external sync. |
| BOOT (Pin 12) | Bootstrap bias | Connect to VOUT for VOUT ≤ 5.5V to reduce quiescent current; to AGND for higher outputs. |
| CVL (Pin 4) | Auxiliary 3V/5mA regulator | Powers external logic or N-channel gate driver; disabled in shutdown. |
| REF (Pin 6) | 1.25V reference output | ±1% accurate, supplies 10µA; used for precision feedback or external circuit biasing. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables dropout operation down to VIN = VOUT + IOUT × (0.24Ω + inductor DCR), critical for Li+ battery end-of-discharge support. |
| Synchronizable 300kHz oscillator | Allows EMI reduction via clock alignment with system timing, avoiding beat frequencies in cellular RF bands. |
| Dual-mode output configuration | Hardware-selectable 3.3V fixed or adjustable output eliminates need for external resistors in standard applications. |
| Integrated 3V/5mA CVL regulator | Reduces external component count by powering level-shifters, logic, or gate drivers without dedicated LDO. |
| Four operational modes | Fixed-frequency PWM (low noise), normal (high efficiency), low-power (25µA IQ), and shutdown (2µA) - dynamically matched to system activity. |
Applications
| Cellular Phone Power Rail | Two-Way Radio Baseband Supply |
|---|---|
Use Scenario: Powers baseband processor and memory in GSM/CDMA handsets using dual Li+ cells (up to 8.4V) with wall adapter compatibility during charging. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3V at up to 1A with <1.4% load transient deviation (0–1A). Use Value: 96% peak efficiency and 150µA normal-mode IQ extend talk time; 300kHz switching avoids interference with 800–2200MHz RF front-end. |
Use Scenario: Supplies digital signal processor and audio codec in ruggedized walkie-talkies operating from 6–14V vehicle or battery sources. IC Role / Device Role / Timing Role: High-input-voltage buck converter with 100% duty cycle supporting brownout operation down to 3.65V input at 3.3V/1A output. Use Value: Internal 3V/5mA CVL powers UART level shifters; SYNC/PWM pin enables burst-mode coordination with MCU sleep cycles. |
| Handheld Terminal Main Logic Rail | Portable PDA System-on-Chip Supply |
Use Scenario: Generates 3.3V main rail for ARM-based industrial handhelds with wide input range (2.7–14V) to accommodate varying battery chemistries and adapters. IC Role / Device Role / Timing Role: Fixed-output buck regulator with FB tied to AGND, BOOT tied to VOUT, and SHDN controlled by system PMIC. Use Value: 0.24Ω P-channel switch and synchronous rectifier minimize thermal rise in sealed enclosures; 16-QSOP footprint fits tight board areas. |
Use Scenario: Powers SoC core and I/O in legacy PDAs requiring clean 3.3V at 1A with minimal external components and low standby drain. IC Role / Device Role / Timing Role: Adjustable-output buck converter (via FB divider) delivering 1.8V or 2.5V to SoC domains, leveraging REF pin for precision. Use Value: ±1% reference and 0.01% DC load regulation ensure stable SoC operation; low-power mode cuts IQ to 25µA during display-off periods. |
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 | 600kHz switching frequency, smaller external inductors/capacitors, identical pinout and feature set except oscillator frequency. | Better suited for space-constrained designs where EMI is less critical than board area; requires re-optimization of LC filter values. | Select MAX1685EEE when PCB real estate is limited and higher-frequency operation is acceptable. |
| MAX1692EUA+ | 10-pin µMAX package, 5.5V max input, 600kHz, no CVL output or BOOT pin, lower IQ (12µA low-power mode). | Targeted at lower-voltage embedded systems (e.g., USB-powered peripherals); lacks high-input-voltage capability and auxiliary rail. | Choose MAX1692EUA+ only for sub-5.5V input applications where 16-QSOP footprint or CVL functionality is unnecessary. |
Compared with MAX1685EEE and MAX1692EUA+, the MAX1684EEE offers optimal EMI performance at 300kHz for RF-dense environments, retains full 14V input support for multi-battery systems, and provides the CVL rail for integrated logic biasing - making it uniquely suitable for legacy cellular and professional radio platforms.
Availability
MAX1684EEE is available at Aetrix Electronics and suitable for cellular phone power management, two-way radio baseband supplies, and handheld terminal main rails requiring stable component supply, long-lifecycle availability, and traceable sourcing for industrial OEM programs.
Supply support for MAX1684EEE 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 industrial, communications, and consumer applications.
The MAX1684/MAX1685 product line was designed specifically for high-efficiency, low-noise power conversion in portable communication devices - emphasizing wide input range, integrated features, and robust operation across battery discharge profiles.
FAQ
What is the maximum input voltage rating for the MAX1684EEE?
The MAX1684EEE has an absolute maximum input voltage rating of 15V, with recommended continuous operation from 2.7V to 14V. This wide range supports two-series lithium-ion batteries (up to 8.4V fully charged) plus wall adapter input during charging, where transient voltages may reach 14V. Exceeding 15V risks permanent damage per the Absolute Maximum Ratings table.
Does the MAX1684EEE support adjustable output voltage, and how is it configured?
Yes, the MAX1684EEE supports adjustable output from 1.25V to VIN using the FB pin. To configure: disconnect FB from AGND and connect it to a resistor divider between VOUT and AGND, with R2 selected between 20kΩ and 100kΩ. Calculate R1 using R1 = R2 × ((VOUT / 1.251V) − 1). The internal 1.251V reference ensures ±1% accuracy across temperature and load.
How does the BOOT pin function in the MAX1684EEE, and what happens if it's misconnected?
The BOOT pin on the MAX1684EEE enables internal bootstrap biasing: connect to VOUT for outputs ≤5.5V to reduce quiescent current by VOUT/VIN scaling; connect to AGND for outputs >5.5V to maintain CVL regulation at 3V. Misconnecting BOOT to VOUT above 5.5V risks overvoltage on internal circuits, while leaving it floating causes unstable CVL output and degraded efficiency in normal/low-power modes.
What are the key differences between MAX1684EEE and MAX1685EEE?
The MAX1684EEE and MAX1685EEE share identical pinout, features, and electrical specifications except switching frequency: MAX1684EEE operates at 300kHz, while MAX1685EEE runs at 600kHz. This difference affects external LC component sizing (smaller inductors/capacitors for MAX1685EEE) and EMI profile (lower fundamental frequency for MAX1684EEE improves RF coexistence in cellular bands).
Can the MAX1684EEE operate in dropout, and what is the typical dropout voltage at 1A?
Yes, the MAX1684EEE supports 100% duty-cycle operation for dropout conditions. At 1A output current, the typical dropout voltage is approximately 0.35V, calculated as IOUT × (0.24Ω P-channel RDS(ON) + inductor DCR). This allows regulation down to VIN ≈ VOUT + 0.35V, extending usable battery life in deep-discharge scenarios common in handheld terminals.
MAX1684EEE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for MAX1684EEE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1684EEE 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 reliable?
The price and inventory of MAX1684EEE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1684EEE is usually 5 days.
3.What payment methods are accepted for MAX1684EEE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1684EEE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1684EEE?
MAX1684EEE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1684EEE 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?
For technical support, including MAX1684EEE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1684EEE requirements.
6.How does Aetrix verify that MAX1684EEE is sourced from the original manufacturer or authorized distributors?
All MAX1684EEE 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 meets industry standards.
7.What is the process for return or replacement of MAX1684EEE?
All MAX1684EEE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1684EEE, 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 part is unused and in its original packaging.
Return procedure for MAX1684EEE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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