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Analog Devices Inc./Maxim Integrated MAX848ESE+
- Part No.:
- MAX848ESE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX848ESE+.pdf
- Description:
- IC REG CONV RF DATA 1OUT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:123
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Product details
Overview
MAX848ESE+ from Maxim Integrated is a synchronous boost DC-DC converter IC designed for low-noise, high-efficiency power conversion in battery-powered RF systems. It delivers a fixed 3.3V or adjustable 2.7V–5.5V output from 0.7V–5.5V input, supports 300kHz PWM or PFM operation, features integrated 0.8A N-channel MOSFET and P-channel synchronous rectifier, and includes dual-channel voltage-to-frequency ADC for battery monitoring - used in digital cordless phones and GSM/DECT handsets.
For engineers reviewing the MAX848ESE+ datasheet, MAX848ESE+ pinout, MAX848ESE+ application, or MAX848ESE+ equivalent, key selection criteria include its 0.8A current limit, 300kHz internal oscillator, 150µW standby quiescent power, dual A/D channel interface with serial DATA output, and Dual Mode™ output configuration supporting both preset and resistor-adjustable regulation.
Technical Context
The MAX848ESE+ integrates a current-mode synchronous boost controller with pulse-skipping PFM for ultra-low quiescent power (150µW) and fixed-frequency PWM (300kHz) for predictable noise spectrum control. Its internal architecture combines an N-channel power switch (0.8A limit), P-channel synchronous rectifier, precision 1.25V reference, and open-drain POK output with programmable trip level via POKIN.
It implements a two-channel, voltage-to-frequency ADC with selectable inputs (AIN1: 0.625V–1.875V; AIN2: 0V–2.5V), serial RZ-format DATA output synchronized to fCLK/2 or fOSC/2, and dual push-button ON/OFF control (ON1/ON2) with 0.15×VOUT hysteresis - all operating from the regulated output rail (OUT-powered).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V or adjustable 2.7V–5.5V via FB resistor divider; enables single-supply compatibility across 3.3V and 5V logic domains. |
| Input Voltage Range | 0.7V–5.5V; supports operation down to single NiCd/NiMH cell (0.9V) or Li-Ion (2.7V–4.2V) without external LDO pre-regulation. |
| Switch Current Limit | 0.8A (N-channel); defines maximum continuous inductor peak current and sets practical load capability at 3.3V output (e.g., ~250mA @ VIN=2.7V). |
| Quiescent Supply Current | 150µW in standby (PFM mode); extends battery life in always-on monitoring applications such as cellular phone battery gauging. |
| Switching Frequency | 300kHz nominal (PWM mode); enables compact 10µH inductor design and simplifies EMI filtering by concentrating noise at known fundamental/harmonic frequencies. |
| ADC Resolution | Monotonic to 8 bits; provides scalable battery voltage telemetry via pulse-density modulated DATA stream, eliminating need for external ADC or µC ADC resources. |
| Power-Good Threshold | Internally fixed at ~3.0V (POK asserts low when VOUT < 2.95V); configurable via external resistor divider on POKIN for custom supply-margin detection. |
Pinout & Package
MAX848ESE+ is housed in a 16-pin narrow SO (SOIC-N) package with exposed thermal pad (PGND-connected). Pin functions are validated per Maxim's official datasheet Rev 2 (12/97), with PGND and GND separated for optimal high-current return path isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AIN1 | ADC Channel 1 analog input | Accepts 0.625V–1.875V battery cell voltage; selected when AINSEL = low; requires anti-aliasing RC filter in noisy environments. |
| 2 AIN2 | ADC Channel 2 analog input | Accepts 0V–2.5V system voltage (e.g., main battery pack); selected when AINSEL = high; supports wider-range telemetry. |
| 3 REF | Precision 1.25V reference output | Bypassed with 0.22µF capacitor; supplies stable reference for external resistor dividers (FB, POKIN) and ADC calibration. |
| 4 GND | Signal ground | Low-current return for logic, ADC, and reference circuits; must be short-traced to PGND to minimize noise coupling. |
| 5 POKIN | Power-good comparator input | Configures POK trip point externally (e.g., 90% of VOUT) using resistor divider from OUT to GND. |
| 6 FB | Feedback input for output regulation | Connected to GND for 3.3V fixed output; connected to resistor divider for 2.7V–5.5V adjustable mode (Dual Mode™). |
| 7 POK | Open-drain power-good indicator | Pulled low when VOUT drops below threshold; requires external pull-up for µC interrupt or status flag generation. |
| 8 PGND | Power ground | High-current return path for LX, POUT, and internal MOSFETs; must be routed separately from GND and tied at single point. |
| 9 AINSEL | ADC channel select input | Logic-controlled multiplexer selector: low → AIN1, high → AIN2; enables dual-battery or system-voltage monitoring. |
| 10 DATA | ADC serial output | RZ-format pulse stream (fCLK/2 or fOSC/2); pulse density proportional to input voltage; driven low in PFM mode. |
| 11 CLK/SEL | Mode control / external sync input | Low → PFM (150µW); high → PWM (300kHz); 200–400kHz signal → synchronized PWM for RF band avoidance. |
| 12 LX | Switch node | Drain of N-channel MOSFET and source of P-channel rectifier; connects to inductor and Schottky diode anode (in PFM mode). |
| 13 OUT | Regulated output supply | Primary power rail for IC core; bypassed with 0.1µF ceramic cap; powers REF, FB, POKIN, and logic circuitry. |
| 14 POUT | Synchronous rectifier source | Source of internal P-channel MOSFET; requires external Schottky diode (LX→POUT) and 0.1µF ceramic bypass to PGND. |
| 15 ON2 | Active-low shutdown control | When ON1 = 0 and ON2 = 1, device enters shutdown; hysteresis prevents chatter near logic thresholds. |
| 16 ON1 | Active-high enable control | When ON1 = 1 or ON2 = 0, device enabled; supports momentary pushbutton "ON" functionality without latching circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost topology | Eliminates external Schottky diode losses in PWM mode, improving efficiency by ~5% vs. nonsynchronous designs at medium-to-heavy loads. |
| Dual Mode™ output configuration | Supports factory-preset 3.3V operation (FB = GND) or resistor-adjustable 2.7V–5.5V output - reduces BOM count and enables single-IC support for multiple voltage rails. |
| Two-channel voltage-to-frequency ADC | Provides battery telemetry without external ADC or µC resources; serial DATA output simplifies interface and reduces PCB routing complexity. |
| 300kHz fixed-frequency PWM + external sync | Enables predictable EMI filtering and allows clock synchronization to 200–400kHz sources - critical for avoiding interference in GSM/DECT IF bands. |
| 150µW standby quiescent power | Extends battery runtime in always-on monitoring states (e.g., sleep-mode battery gauge), outperforming typical boost converters by >10× in light-load efficiency. |
| Integrated 0.8A N-channel switch + P-channel rectifier | Reduces external component count and layout area; eliminates need for discrete MOSFET drivers or gate charge pumps in portable designs. |
Applications
| Digital Cordless Phones | GSM Handsets |
|---|---|
Use Scenario: Powering 3.3V RF transceiver and baseband processor from single Li-Ion cell (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary step-up regulator with integrated battery monitoring ADC and power-good signaling. Use Value: Enables direct Li-Ion integration without pre-regulator; ADC channels monitor cell voltage and system rail simultaneously for accurate state-of-charge estimation. |
Use Scenario: Delivering pulsed 3.3V supply to GSM PA during TDMA transmit bursts (217Hz envelope). IC Role / Device Role / Timing Role: High-transient-response boost converter with synchronized PWM to avoid IF band interference. Use Value: Maintains <30mV output ripple under 200mA 577µs GSM pulses; external clock sync shifts harmonics away from 217Hz/434Hz receive bands. |
| DECT Handsets | Palmtop Computers |
Use Scenario: Generating stable 3.3V rail for DECT transceiver IC from 1.2V NiMH stack (3-cell). IC Role / Device Role / Timing Role: Low-input-voltage boost regulator with PFM mode for standby and PWM for active transmission. Use Value: Starts reliably at 0.9V input; achieves >85% efficiency at 50–400mA DECT burst loads while maintaining <200mVpp ripple. |
Use Scenario: Providing 5V local supply for USB peripherals and SD card interface from 3.3V main rail. IC Role / Device Role / Timing Role: Adjustable-output boost converter with Dual Mode™ configuration and power-good validation. Use Value: Resolves voltage mismatch between 3.3V SoC and 5V peripherals; POK output confirms stable 5V before enabling USB PHY. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX849ESE+ | Higher 1.4A N-channel switch current limit; identical pinout, package, and feature set. | Supports higher output current (e.g., 500mA @ 3.3V with VIN=2.4V) but draws more quiescent current in PFM mode (300µW vs. 150µW). | Select MAX849ESE+ when load current exceeds 250mA at 3.3V; otherwise MAX848ESE+ offers better light-load efficiency. |
| TPS61040DRVR | 0.5A switch, 500kHz fixed frequency, no integrated ADC or POK; requires external feedback resistors for all outputs. | Lacks battery monitoring and power-good functions; suited for cost-sensitive, non-telemetry applications where board space is constrained. | Choose TPS61040DRVR only if ADC/POK are unnecessary and higher switching frequency justifies trade-off in noise control and efficiency at light loads. |
Compared with MAX849ESE+, MAX848ESE+ trades peak current capability for superior light-load efficiency and lower standby power - ideal for battery-gauging handsets. Against TPS61040DRVR, it adds integrated telemetry and supply validation at the cost of slightly larger solution size and higher unit price.
Availability
MAX848ESE+ is available at Aetrix Electronics and suitable for digital cordless phones, GSM/DECT handsets, and palmtop computers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX848ESE+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX848/MAX849 product line was engineered specifically for noise-sensitive, battery-powered RF systems - integrating boost conversion, battery telemetry, and supply monitoring into a single monolithic IC to reduce solution size and improve system-level reliability.
FAQ
What is the minimum input voltage required for MAX848ESE+ to start up?
The MAX848ESE+ starts up at a minimum input voltage of 0.9V (typical) when configured for 3.3V output in PWM mode, and remains operational down to 0.7V due to bootstrap operation from the regulated output rail. Startup voltage increases with higher output voltages or heavier loads - e.g., 1.2V is required for 3.3V output at 200mA load per the Typical Operating Characteristics graph TOC-06.
How does the MAX848ESE+ implement battery voltage monitoring without an external ADC?
The MAX848ESE+ uses an internal two-channel voltage-to-frequency ADC that converts analog inputs (AIN1: 0.625V–1.875V; AIN2: 0V–2.5V) into a pulse-density modulated serial DATA stream. The pulse rate is proportional to input voltage, with full-scale input yielding fCLK/2 pulses per second - enabling µC-based voltage measurement using simple counter/timer peripherals without external ADC hardware.
Can the MAX848ESE+ operate in both fixed 3.3V and adjustable output modes on the same PCB?
Yes - the MAX848ESE+ supports Dual Mode™ operation. Connecting FB directly to GND configures fixed 3.3V output; connecting FB to a resistor divider from OUT to GND enables 2.7V–5.5V adjustment. Both configurations share identical pinout and layout; only FB network changes are needed, allowing one PCB design to serve multiple voltage requirements.
What is the purpose of separating PGND and GND pins on the MAX848ESE+?
PGND (Pin 8) carries high-current return paths for the internal N-channel MOSFET, P-channel rectifier, and LX/POUT switching nodes, while GND (Pin 4) serves low-current analog and logic circuits (ADC, REF, POK, ON1/ON2). Separating them minimizes noise coupling from switching transients into sensitive reference and monitoring circuitry - essential for ADC accuracy and stable regulation.
Does the MAX848ESE+ require an external Schottky diode, and when is it used?
The MAX848ESE+ requires an external Schottky diode (e.g., MBR0520L) only in PFM mode, where the internal P-channel synchronous rectifier is disabled. In PWM mode, the internal rectifier is active and the diode carries no current. The diode is placed anode-to-LX, cathode-to-POUT, and sized for ≤0.5A average current - primarily serving as a safety path during startup or fault conditions.
MAX848ESE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Last Time Buy
- Applications:
- Converter, RF Data Links
- Voltage - Input:
- 0.7V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 3.3V, 2.7V ~ 5.5V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX848ESE+ FAQ
1.How can I place an order for MAX848ESE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX848ESE+ 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 MAX848ESE+ reliable?
The price and inventory of MAX848ESE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX848ESE+ is usually 5 days.
3.What payment methods are accepted for MAX848ESE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX848ESE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX848ESE+?
MAX848ESE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX848ESE+ 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 MAX848ESE+?
For technical support, including MAX848ESE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX848ESE+ requirements.
6.How does Aetrix verify that MAX848ESE+ is sourced from the original manufacturer or authorized distributors?
All MAX848ESE+ 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 MAX848ESE+ meets industry standards.
7.What is the process for return or replacement of MAX848ESE+?
All MAX848ESE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX848ESE+, 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 MAX848ESE+ part is unused and in its original packaging.
Return procedure for MAX848ESE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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