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Analog Devices Inc./Maxim Integrated MAX1687EUE+
- Part No.:
- MAX1687EUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1687EUE+.pdf
- Description:
- IC REG BOOST ADJ 730MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
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Product details
Overview
MAX1687EUE+ from Maxim Integrated is a step-up DC-DC converter optimized for GSM RF power amplifier burst-load applications, delivering up to 2W from 2.7V–6V input (single Li-Ion or three NiMH cells), featuring precise voltage-controlled current limit via LIM pin, 90% peak efficiency, and 3µA shutdown current.
For engineers reviewing the MAX1687EUE+ datasheet, MAX1687EUE+ pinout, MAX1687EUE+ application, or MAX1687EUE+ equivalent, key selection considerations include peak battery current limiting (450mA typ), adaptive reservoir capacitor charging control, TSSOP-16 package compatibility, and GSM-synchronized standby mode for RF noise suppression.
Technical Context
The MAX1687EUE+ employs hysteretic inductor-current control with programmable peak current (via LIM pin) and four-phase soft-start (Linear → Pseudo Buck → Pseudo Boost → Boost) to minimize inrush and battery voltage sag. It integrates synchronous N- and P-channel MOSFETs and an internal current-sense resistor.
Unlike the MAX1688, the MAX1687EUE+ implements fixed voltage-controlled current limiting-not adaptive recharge timing-making it suitable for microcontroller-driven systems where external DAC sets dynamic burst current limits. Its ON pin enables synchronized shutdown during RF transmit bursts to eliminate switching noise coupling into sensitive analog/RF paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 6V - supports single Li-Ion (2.7–4.2V), three NiMH (3.0–4.5V), or alkaline cells without external regulation. |
| Output Voltage Range | 1.25V to 6V - adjustable via external resistor divider on FB pin; regulated by 1.25V internal reference. |
| Peak Battery Current Limit | 450mA typical - set by 0–1V analog voltage on LIM pin; enables optimization of reservoir capacitor size vs. battery life. |
| Conversion Efficiency | Up to 90% - achieved using integrated synchronous rectification, eliminating external Schottky diode and associated losses. |
| Shutdown Current | 3µA - ultra-low quiescent draw in shutdown mode (ON < 0.6V for >1.2ms), critical for standby power budgeting in portable devices. |
| Switching Frequency | Exceeds 1MHz - determined by inductor value and load; enables compact magnetics and reduced output ripple. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and mobile handset environments with full electrical performance guaranteed. |
Pinout & Package
MAX1687EUE+ is housed in a 16-pin thin shrink small-outline package (TSSOP), 4.4mm × 5.0mm × 1.1mm max height, with exposed thermal pad (PGND-connected). Pin pitch is 0.65mm. The package supports high-density PCB layouts and efficient thermal dissipation in space-constrained GSM modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Supply Input | Battery input connection; requires ≥47µF low-ESR bypass capacitor to PGND to stabilize input during burst loads. |
| OUT | Regulated Output | High-current output node feeding reservoir capacitor and RF PA; connects directly to LX2 through internal P-MOSFET in precharge mode. |
| LX1 / LX2 | Power Switch Nodes | LX1 is N-MOSFET source; LX2 is shared drain of N- and P-MOSFETs - forms synchronous boost switch node pair driving external inductor. |
| PGND | Power Ground | High-current return path for LX1/LX2 switching currents; must be star-connected to input/output capacitors to minimize ground bounce. |
| AGND | Analog Ground | Reference ground for FB, REF, LIM; isolated from PGND to prevent noise coupling into feedback loop. |
| FB | Feedback Input | Senses output voltage via resistor divider; regulates to 1.25V nominal; transconductance = 200µA/V for stable loop response. |
| REF | Reference Output | 1.25V ±1.5% precision reference; supplies ≤10µA - usable as bias for LIM-setting resistor divider in TSSOP packages. |
| ON | Enable/Standby Control | Logic-level input: high = normal operation; low >1.2ms = shutdown (3µA); low during RF burst = standby (zero switching noise). |
| LIM | Current Limit Adjust | Analog input (0–1V) setting peak battery current per ILIM = VLIM × 0.86A/V – 0.06A; clamped at 1.25V internally. |
| N.C. | No Connection | Pin 9 in TSSOP is unconnected - no internal bond wire; must be left floating or tied to AGND for mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Rectification | Eliminates external Schottky diode, reducing BOM count and conduction losses - contributes to >90% efficiency at 500mA load. |
| Voltage-Controlled Current Limit | Enables precise, software-adjustable peak battery current (450mA typ) via DAC or resistor divider on LIM pin - critical for Li-Ion end-of-discharge protection. |
| GSM-Synchronized Standby Mode | ON pin assertion during RF transmit disables switching entirely, removing switching noise from PA supply rail - improves EVM and adjacent channel leakage ratio (ACLR). |
| Four-Phase Soft-Start Sequence | Prevents input voltage droop at power-up by ramping output through Linear → Pseudo Buck → Pseudo Boost → Boost stages - avoids system reset during cold start. |
| Output Disconnect in Shutdown | Internal P-MOSFET isolates IN from OUT when disabled - prevents reverse current flow and preserves reservoir capacitor charge for next burst. |
Applications
| GSM Mobile Handsets | Wireless PCMCIA Cards |
|---|---|
Use Scenario: Powering RF power amplifier during 12% duty-cycle GSM transmit bursts (e.g., 2.66A @ 3.6V for 577µs). IC Role / Device Role / Timing Role: Step-up converter supplying peak current from reservoir capacitor while limiting instantaneous battery draw to ≤450mA. Use Value: Extends Li-Ion battery runtime by minimizing voltage sag and internal resistance heating during repeated transmit cycles. | Use Scenario: Providing regulated 5V supply to PC Card peripherals (e.g., WLAN baseband ICs) from 3.3V host bus with pulsed current demand. IC Role / Device Role / Timing Role: Burst-mode DC-DC regulator enabling hot-plug operation without violating host-side current limits. Use Value: Meets PCMCIA specification for <500mA peak input current while delivering >2A pulsed output - avoids host bus overcurrent faults. |
| Industrial Telemetry Modules | Portable Medical RF Sensors |
Use Scenario: Powering narrowband IoT transceivers (e.g., LTE-M, NB-IoT) requiring short high-current TX bursts in battery-operated field units. IC Role / Device Role / Timing Role: Efficient energy reservoir manager synchronizing charge/discharge cycles with wireless transmission windows. Use Value: Enables 10+ year battery life in sealed enclosures by reducing average battery current and optimizing capacitor sizing trade-offs. | Use Scenario: Supplying RF front-end in wearable ECG or glucose monitor with Bluetooth LE transmission bursts. IC Role / Device Role / Timing Role: Low-noise, low-quiescent boost converter ensuring clean PA supply during diagnostic data upload. Use Value: Maintains signal integrity during RF transmission by eliminating switching artifacts - critical for FDA Class II device EMC compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1688EUE+ | Replaces voltage-controlled LIM with adaptive constant-recharge-time algorithm using CHG pin; higher complexity but self-optimizing for varying VIN/VDROOP. | Preferred for fixed-function GSM handsets without MCU control; eliminates need for external DAC or calibration. | Select MAX1688EUE+ when reservoir recharge timing must adapt autonomously to battery aging or temperature drift. |
| TPS61088RHLR | Higher 5.5A switch current rating, 2.7–12V input, but lacks dedicated GSM burst-mode logic or LIM/CHG pins; uses I2C for configuration. | Suitable for broader portable applications (e.g., USB PD sink, display bias), not optimized for RF-noise-sensitive GSM burst timing. | Choose TPS61088RHLR only if system requires >2W continuous output or I2C programmability - not a drop-in replacement for MAX1687EUE+. |
Compared with MAX1688EUE+, the MAX1687EUE+ offers deterministic, externally controllable current limiting ideal for MCU-coordinated burst management; versus TPS61088RHLR, it provides lower noise, tighter GSM-specific timing control, and simpler analog interface - at the cost of lower maximum output power and no digital configurability.
Availability
MAX1687EUE+ is available at Aetrix Electronics and suitable for GSM handset design, wireless PCMCIA card development, and industrial telemetry modules requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX1687EUE+ 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 high-performance analog and mixed-signal ICs for power management, sensing, and communications, with emphasis on efficiency, integration, and reliability in portable and industrial systems.
The MAX1687EUE+ belongs to Maxim's GSM-optimized power management product line, engineered specifically to solve battery surge current and RF noise coupling challenges in 2G/EDGE mobile infrastructure and handheld devices.
FAQ
What is the primary function of the LIM pin on the MAX1687EUE+?
The LIM pin on the MAX1687EUE+ sets the peak battery current limit via an analog voltage (0–1V). Applying 0.5V yields ~370mA peak current (ILIM = VLIM × 0.86A/V – 0.06A). This allows precise control of inrush during GSM bursts, protecting aging Li-Ion cells and minimizing voltage sag. The MAX1687EUE+ uses this pin exclusively - unlike the MAX1688EUE+, which replaces LIM with CHG for adaptive recharge timing.
Can the MAX1687EUE+ operate with a 1.5V input source?
No, the MAX1687EUE+ requires a minimum 2.7V input voltage as specified in its absolute maximum ratings and electrical characteristics tables. Operation below 2.7V violates the input undervoltage lockout threshold and will prevent startup or cause erratic regulation. For sub-2.7V battery chemistries (e.g., single alkaline), a different boost converter such as the MAX1722 must be used instead of the MAX1687EUE+.
How does the MAX1687EUE+ reduce RF interference during GSM transmission?
The MAX1687EUE+ reduces RF interference by entering standby mode when the ON pin is driven low during RF transmit bursts. In standby, switching ceases completely, eliminating switching noise that could couple into the PA or antenna path. The charged reservoir capacitor continues supplying burst current, maintaining clean power delivery. This behavior is explicitly designed into the MAX1687EUE+ architecture and verified in its typical operating waveforms.
Is the REF pin on the MAX1687EUE+ intended for external circuit biasing?
Yes - the REF pin on the MAX1687EUE+ delivers a precise 1.25V ±1.5% reference voltage capable of sourcing up to 10µA. In TSSOP packages, it is commonly used to bias the resistor divider that generates the LIM voltage (e.g., R3/R4 network in Figure 5a), eliminating need for a separate voltage source. REF must not be loaded beyond 10µA, and its output impedance is not designed for driving capacitive loads directly.
What is the recommended inductor value for a 5V output from a 3.3V input using the MAX1687EUE+?
For 5V output from 3.3V input, a 10µH inductor is recommended per Maxim's typical application circuits (Figures 6a and 6b). This yields ~500kHz switching frequency under 300–500mA loads and balances efficiency, size, and ripple. Inductor DCR should be ≤0.1Ω and saturation current ≥1.2A. Coilcraft DO3316P-103 or Murata LQH3N2R2M04 are validated options per Maxim's component supplier list.
MAX1687EUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 730mA (Switch)
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
MAX1687EUE+ FAQ
1.How can I place an order for MAX1687EUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1687EUE+ 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 MAX1687EUE+ reliable?
The price and inventory of MAX1687EUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1687EUE+ is usually 5 days.
3.What payment methods are accepted for MAX1687EUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1687EUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1687EUE+?
MAX1687EUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1687EUE+ 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 MAX1687EUE+?
For technical support, including MAX1687EUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1687EUE+ requirements.
6.How does Aetrix verify that MAX1687EUE+ is sourced from the original manufacturer or authorized distributors?
All MAX1687EUE+ 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 MAX1687EUE+ meets industry standards.
7.What is the process for return or replacement of MAX1687EUE+?
All MAX1687EUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1687EUE+, 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 MAX1687EUE+ part is unused and in its original packaging.
Return procedure for MAX1687EUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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