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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:117
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Product details
Overview
MAX1684EEE+ 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 features synchronous rectification, 100% duty-cycle operation for low-dropout, and four operating modes including shutdown (2µA IQ). It powers cellular phones, PDAs, and handy-terminals requiring compact, low-noise power conversion.
For engineers reviewing the MAX1684EEE+ datasheet, MAX1684EEE+ pinout, MAX1684EEE+ application, or MAX1684EEE+ equivalent, key selection criteria include guaranteed 1A output at 3.3V, 300kHz switching frequency, 0.24Ω P-channel on-resistance, ±1% reference accuracy, and 16-QSOP package compatibility with space-constrained portable designs.
Technical Context
The MAX1684EEE+ uses current-mode PWM control with oscillator-triggered minimum/maximum on-time (220ns min, 2/fOSC max), enabling cycle-by-cycle current limiting and fast transient response. Its dual-mode feedback supports either fixed 3.3V output (FB grounded) or externally adjustable output (FB to resistor divider).
It integrates a P-channel high-side switch and N-channel synchronous rectifier, with internal VL (3V/5mA CVL) and VH (−4.6V w.r.t. IN) regulators. Bootstrap operation (BOOT tied to VOUT) reduces quiescent current in normal/low-power modes by sourcing internal logic from the output rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 14V - supports two Li+ batteries and wall-cube charging without external LDO pre-regulation. |
| Output Voltage | Fixed 3.3V ±1% or adjustable 1.25V to VIN - enables direct microcontroller core supply or flexible system rail generation. |
| Max Output Current | 1A continuous - sufficient for baseband processors and RF front-ends in handheld devices. |
| Switching Frequency | 300kHz - balances efficiency and external component size; allows use of 22µH inductors per typical design. |
| Efficiency | Up to 96% - achieved via low 0.24Ω P-channel switch RDS(on) and integrated synchronous rectification. |
| Quiescent Current | 25µA in low-power mode - extends battery life during standby in portable applications. |
| Reference Accuracy | ±1% at REF pin - ensures stable feedback loop performance across temperature and load. |
Pinout & Package
MAX1684EEE+ is housed in a 16-pin QSOP package (5.0mm × 6.2mm, 0.635mm pitch), optimized for high-density portable PCB layouts. Thermal pad not present; power dissipation rated at 667mW at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power input supply | Accepts 2.7V–14V; connects to input capacitor and bypasses AIN/CVH internally. |
| LX (13,14) | Switch node | Drain of internal P-channel MOSFET; connects directly to inductor and Schottky diode cathode. |
| PGND (16) | Power ground | High-current return path for LX and internal switch; must be routed separately from AGND. |
| AGND (5) | Analog ground | Reference ground for FB, REF, CC, ILIM/SS; requires star connection near IC to minimize noise coupling. |
| FB (7) | Feedback input | Sets output: grounded for 3.3V mode; connected to resistor divider for adjustable output (VFB = 1.25V). |
| REF (6) | 1.25V reference output | ±1% accurate, supplies ≤10µA; used for precision external feedback or biasing. |
| CVL (4) | 3V/5mA auxiliary regulator | Powers external logic or low-voltage peripherals; disabled in shutdown. |
| BOOT (12) | Bootstrap supply | Tied to VOUT for VOUT ≤ 5.5V to reduce IQ; tied to AGND for higher outputs. |
| SHDN (15) | Active-low enable | Logic-compatible input; withstands full VIN; pulls internal circuitry to zero current in shutdown (2µA). |
| SYNC/PWM (9) | Mode control | Driven high for fixed-frequency PWM; low for normal (PFM/PWM hybrid); open or CVL for PWM-only. |
| STBY (11) | Standby override | Connect to AGND to force low-power (PFM-only) mode independent of SYNC/PWM state. |
| CC (8) | Integrator capacitor | 0.01µF to AGND sets compensation pole; critical for loop stability with small output capacitors. |
| ILIM/SS (10) | Current limit/soft-start | Voltage sets PWM (0.5–1.75A) and low-power (110–380mA) current limits; capacitor enables controlled startup. |
| AIN (2) | Analog supply | Bypassed to PGND; supplies internal analog blocks; not intended for external loads. |
| CVH (1) | High-side gate bias | Bypassed to IN; generates −4.6V w.r.t. IN for P-channel gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| Four selectable operating modes | Fixed-frequency PWM (low EMI), normal (PFM/PWM hybrid), low-power (PFM only), and shutdown - enables dynamic power optimization across usage states. |
| 100% duty-cycle dropout operation | Maintains regulation down to VIN = VOUT + IOUT×RDS(on) ≈ 3.65V @ 1A - eliminates need for backup LDO in battery-depleted scenarios. |
| Synchronizable switching frequency | Accepts external TTL clock up to 700kHz - allows EMI spreading or synchronization with system clocks to avoid beat frequencies. |
| Dual-mode output configuration | Single-pin FB selection between factory-trimmed 3.3V (±1%) and user-adjustable 1.25V–VIN - reduces BOM count and simplifies variant management. |
| Integrated 3V/5mA CVL regulator | Supplies external logic (e.g., RF transceiver enable, sensor interface) without additional LDO - saves board area and cost in multi-rail systems. |
Applications
| Cellular Phone Power Management | Handheld Terminal Baseband Supply |
|---|---|
Use Scenario: Powers baseband processor and memory in dual-Li+ battery-powered smartphones during active call and standby modes. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V at up to 1A; manages transition between PWM (active) and low-power PFM (standby) modes. Use Value: 96% peak efficiency and 25µA low-power IQ extend talk time and standby duration; 100% duty cycle sustains operation as battery voltage drops below 3.3V. | Use Scenario: Supplies 3.3V rail to ARM-based application processor and display controller in ruggedized field terminals. IC Role / Device Role / Timing Role: Main system power converter with synchronized switching to avoid interference with 2.4GHz Wi-Fi/Bluetooth radios. Use Value: 300kHz fixed-frequency PWM mode provides clean spectral profile; 16-QSOP footprint fits tight mechanical envelopes without thermal vias. |
| Two-Way Radio Audio Subsystem | Portable PDA Peripheral Interface |
Use Scenario: Generates clean 3.3V supply for audio codec and speaker amplifier in walkie-talkies with intermittent transmit bursts. IC Role / Device Role / Timing Role: Low-noise buck converter operating in PWM mode during TX; switches to low-power mode during RX/idle to conserve battery. Use Value: Fixed-frequency operation minimizes conducted EMI into sensitive analog audio paths; ±1% VREF ensures consistent ADC/DAC reference accuracy. | Use Scenario: Powers USB PHY, SD card interface, and touchscreen controller in palm-sized PDAs with mixed-signal signal integrity requirements. IC Role / Device Role / Timing Role: System PMIC providing regulated 3.3V with fast load-transient response (<100mV deviation at 1A step) and low output ripple. Use Value: Synchronous rectification and 0.24Ω RDS(on) deliver <50mV dropout at full load; CC/REF pins enable precise loop tuning for digital interface stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1692EUA+ | 10-pin µMAX, 5.5V max input, 600kHz, 0.6A output - smaller package but lower voltage/current capability. | Targeted at single-cell Li+ (≤4.2V) applications only; unsuitable for dual-cell or wall-adapter inputs. | Select MAX1692EUA+ only when input never exceeds 5.5V and load current stays ≤0.6A; otherwise MAX1684EEE+ remains optimal. |
| TPS62130ARGTR | 3-MHz sync buck, 3–17V input, 3A output, 1.2–6V adj - higher frequency, higher current, different pinout and control scheme. | Requires external compensation and lacks integrated CVL; better suited for high-current industrial modules than portable battery systems. | Choose TPS62130ARGTR for >1A loads or 3MHz operation; MAX1684EEE+ preferred for proven 3.3V/1A portable integration with auxiliary CVL. |
Compared with MAX1692EUA+, MAX1684EEE+ supports wider input (2.7–14V vs. ≤5.5V) and higher current (1A vs. 0.6A), making it suitable for dual-battery and adapter-powered devices; versus TPS62130ARGTR, MAX1684EEE+ offers integrated 3V/5mA CVL and simpler 3.3V-fixed configuration, reducing external component count in space-constrained handhelds.
Availability
MAX1684EEE+ is available at Aetrix Electronics and suitable for cellular phone power management, handheld terminal baseband supply, and two-way radio audio subsystems requiring stable component supply across extended production lifecycles.
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 portable, industrial, and communications applications.
The MAX1684/MAX1685 product line was designed specifically for low-noise, high-efficiency power conversion in battery-powered handheld devices requiring wide-input voltage range and multiple operating modes.
FAQ
What is the maximum input voltage rating for MAX1684EEE+?
The absolute maximum input voltage for MAX1684EEE+ is 15V, with recommended continuous operation from 2.7V to 14V. Exceeding 15V risks permanent damage per Absolute Maximum Ratings. The 14V upper limit ensures reliable operation across dual Li+ battery charge cycles and wall-cube inputs, while maintaining margin against transient spikes.
Can MAX1684EEE+ operate with an output voltage other than 3.3V?
Yes, MAX1684EEE+ supports adjustable output from 1.25V to VIN using an external resistor divider connected to the FB pin. When FB is grounded, it defaults to the factory-trimmed 3.3V ±1% output. The internal 1.25V reference (REF pin) enables precise external feedback design, and the datasheet provides resistor calculation formulas and compensation guidance.
How does the BOOT pin function in MAX1684EEE+?
The BOOT pin in MAX1684EEE+ connects to the output (VOUT) for VOUT ≤ 5.5V to enable bootstrap operation, reducing quiescent current by powering internal logic from the output rail. For VOUT > 5.5V, BOOT must connect to AGND to maintain CVL regulation at 3V. Incorrect BOOT routing causes excessive IQ or CVL instability, per datasheet Note 1 and Figure 1.
What is the purpose of the CVL pin on MAX1684EEE+?
The CVL pin on MAX1684EEE+ provides a regulated 3V output capable of sourcing up to 5mA for external logic circuits such as RF transceiver enable lines or sensor interfaces. It is internally generated and disabled during shutdown. Bypassing CVL to AGND with a 1µF capacitor is mandatory for stability, and loading beyond 5mA degrades regulation accuracy.
Does MAX1684EEE+ support external clock synchronization?
Yes, MAX1684EEE+ supports external clock synchronization via the SYNC/PWM pin, which accepts TTL-level square waves up to 700kHz. When driven externally, the device locks its switching frequency to the input clock, eliminating beat frequencies in multi-rail systems. This feature is confirmed in Electrical Characteristics (fOSC capture range: 360–700kHz for MAX1684) and Typical Operating Characteristics (SYNC Capture Range graph).
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:
- 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+ 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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