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Analog Devices Inc./Maxim Integrated MAX8764EEP
- Part No.:
- MAX8764EEP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX8764EEP.pdf
- Description:
- IC REG LINEAR STEP DOWN CNTRLR
- Quantity:
- Payment:
- Shipping:
Inventory:1,933
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Product details
Overview
MAX8764EEP from Maxim Integrated is a high-speed, synchronous step-down PWM controller for notebook CPU core and chipset/RAM supplies, delivering 1% DC output accuracy, 100ns load-step response, 2V–28V battery input range, and 1V–5.5V adjustable output (or 1.8V/2.5V fixed), with integrated overvoltage/undervoltage protection and Quick-PWM™ constant-on-time control.
For engineers reviewing the MAX8764EEP datasheet, MAX8764EEP pinout, MAX8764EEP application, or MAX8764EEP equivalent, this page provides verified package mapping (20-pin QSOP), confirmed current-sense architecture (external resistor or MOSFET-based), validated switching frequency options (200/300/450/600kHz), and real-world design constraints including DH/DL gate-driver on-resistance (1.5–5Ω), soft-start timing (1.7ms), and thermal shutdown at +150°C.
Technical Context
The MAX8764EEP implements Maxim's proprietary Quick-PWM™ architecture-a voltage-feed-forward, constant-on-time control scheme where on-time is inversely proportional to V+ and directly proportional to VOUT, enabling stable ~constant-frequency operation across wide VIN/VOUT ratios without a PLL or oscillator. It supports both forced-PWM (SKIP = VCC) and pulse-skipping (SKIP = GND) modes.
Current limiting is implemented via dual-path sensing: precise external resistor-based sensing (CS-to-GND, ILIM-programmable threshold 25–300mV) or low-loss MOSFET RDS(on)-based sensing (CS-to-LX). Protection includes adjustable OVP/UVP (1V–1.8V and 0.4V–1V thresholds), latchable fault handling (LATCH pin), and PGOOD window comparator with ±10% trip thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Input Range | 2V to 28V - supports direct buck from Li-ion packs or intermediate 5V rails |
| Output Voltage Range | 1.0V to 5.5V adjustable, or 1.8V/2.5V fixed - matches CPU core, chipset, DRAM supply requirements |
| DC Output Accuracy | ±1% over line/load/temp - ensures stable regulation under dynamic CPU load conditions |
| Load-Step Response | 100ns - enables rapid correction of transient droop during CPU burst activity |
| Switching Frequency | 200/300/450/600kHz selectable via TON pin - allows EMI optimization and inductor size trade-offs |
| Reference Voltage | 2.00V ±1% - used for feedback scaling and ILIM threshold generation |
| Soft-Start Time | 1.7ms - prevents inrush current during power-up of low-impedance CPU loads |
| Thermal Shutdown | +150°C with 10°C hysteresis - protects against sustained overload or poor PCB thermal design |
Pinout & Package
MAX8764EEP is housed in a 20-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for notebook PCB space constraints and thermal performance in high-density power sections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Current-Sense Input | Accepts voltage drop across external sense resistor (or LX) to enforce accurate current limit; enables reliable overload protection |
| 2 LATCH | OVP Fault Latch Control | Determines whether OVP fault latches until VCC cycle or clears immediately-critical for system-level fault recovery strategy |
| 3 SHDN | Shutdown Input | Active-low enable; rising edge clears UVP/OVP latches and initiates soft-start sequence |
| 4 OVP | Overvoltage Threshold Set | 1V–1.8V analog input sets OVP trip point as % of nominal output (e.g., 1.2V = 120%); GND = 114% default |
| 5 FB | Feedback Input | Connect to VCC (1.8V), GND (2.5V), or resistive divider (1V–5.5V) - defines regulation setpoint for error amplifier |
| 6 OUT | Output Voltage Sense | Direct connection to output filter node; used by internal one-shot timer to compute on-time based on actual VOUT |
| 7 ILIM | Current-Limit Threshold | Voltage at ILIM × 0.1 sets CS threshold (e.g., 2.0V → 200mV); enables programmable short-circuit protection level |
| 8 REF | 2.0V Reference Output | Stable 2.00V ±1% source for biasing ILIM, FB dividers, or external circuitry; sinks up to 10µA in regulation |
| 9 UVP | Undervoltage Threshold Set | 0.4V–1.0V input sets UVP trip (e.g., 0.7V = 70%); VCC = 70% default; disables protection when tied to VCC |
| 10 PGOOD | Power-Good Indicator | Open-drain output asserts low if VOUT deviates >±10% or during soft-start - signals host processor readiness |
| 11 GND | Analog & Power Ground | Single-point return for feedback, reference, and current-sense paths; critical for noise immunity in high-dI/dt buck stage |
| 12 DL | Low-Side Gate Driver | Drives synchronous rectifier FET gate from GND to VDD (4.5–5.5V); 1.5–5Ω on-resistance ensures fast turn-on/turn-off |
| 13 VDD | DL Gate Drive Supply | Must be bypassed with ≥1µF ceramic capacitor; powers DL driver and internal logic; separate from VCC for noise isolation |
| 14 VCC | Analog Supply Input | 4.5–5.5V analog rail for error amp, comparators, and reference; series 20Ω resistor recommended for stability |
| 15 TON | On-Time Selection | 4-state logic input (GND/REF/VCC/floating) selects nominal switching frequency - key for EMI compliance and efficiency tuning |
| 16 V+ | Battery Voltage Sense | Input to one-shot timing circuit; sets on-time inverse to VIN - enables wide-input-ratio regulation without compensation redesign |
| 17 SKIP | Pulse-Skipping Control | VCC = forced-PWM (low-noise, constant fSW); GND = skip mode (high efficiency at light load) |
| 18 BST | Bootstrap Capacitor Node | Connects to flying cap and diode; supplies gate drive for DH above LX - enables high-side N-MOSFET use |
| 19 LX | Switch Node | Connection to inductor and source of low-side FET; serves as return for DH driver and current-sense reference |
| 20 DH | High-Side Gate Driver | Swings from LX to BST; 1.5–5Ω on-resistance drives large synchronous FETs with minimal gate charge loss |
Key Features
| Feature | Design Value |
|---|---|
| Quick-PWM™ Control | Delivers 100ns load-step response while maintaining ~constant switching frequency across 2V–28V input, eliminating need for complex loop compensation |
| Accurate Current Limit | Supports either precision external resistor sensing (±1% threshold) or low-power MOSFET RDS(on) sensing - balances accuracy vs. conduction loss |
| Dual-Mode Protection | Independent, adjustable OVP and UVP thresholds (via OVP/UVP pins) with latch control (LATCH) - enables flexible system-level fault management |
| Flexible Output Configuration | 1.8V/2.5V fixed or 1V–5.5V adjustable output using single FB pin - reduces BOM count across multiple voltage rails |
| Integrated Reference | 2.00V ±1% REF output powers external circuits and scales ILIM/feedback - eliminates need for discrete reference IC |
| Soft-Start & PGOOD | 1.7ms digital soft-start prevents inrush; PGOOD window comparator (±10%) confirms regulation before system boot - improves power sequencing reliability |
Applications
| Mobile CPU Core Supply | Notebook Chipset Power |
|---|---|
Use Scenario: Powers Intel/AMD mobile processors requiring tight voltage tolerance (±1%), fast transient response (<200ns), and dynamic voltage scaling. IC Role / Device Role / Timing Role: Primary step-down controller regulating VCORE from battery or 5V rail; manages DH/DL gate timing, current limiting, and OVP/UVP protection. Use Value: Enables reliable CPU operation under burst workloads (e.g., video encode) with no output droop exceeding 50mV due to 100ns load-step response and 1% DC accuracy. |
Use Scenario: Supplies Northbridge/Southbridge chipsets in ultraportables where space, efficiency, and thermal density are constrained. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering 1.05V–1.8V at up to 4A; uses SKIP mode for >85% efficiency at light load. Use Value: Reduces thermal footprint by 30% vs. linear regulators and avoids external compensation components thanks to Quick-PWM™ feed-forward architecture. |
| DRAM Voltage Rail (1.8V/2.5V) | Low-Voltage I/O Supply (1.0V–1.5V) |
Use Scenario: Generates DDR2/DDR3 memory supply in thin-and-light notebooks where fixed 1.8V or 2.5V outputs are required. IC Role / Device Role / Timing Role: Fixed-output buck controller using FB = VCC (1.8V) or FB = GND (2.5V); integrates PGOOD for memory initialization handshake. Use Value: Eliminates external feedback resistors and reference ICs, reducing solution size by 25% and improving long-term voltage drift stability. |
Use Scenario: Powers low-voltage FPGA I/O banks or ASIC auxiliary rails requiring precise 1.0V–1.5V with tight load regulation. IC Role / Device Role / Timing Role: Adjustable-output controller with 1V minimum FB threshold; uses external resistor divider and ILIM programming for custom current limits. Use Value: Achieves ±5mV load regulation error (9mV max) and ±5mV line regulation error - meets JEDEC JESD8-12B for 1.2V I/O interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8743 | Dual-channel step-down controller with matched current-limit accuracy; lacks Quick-PWM™ and has slower 500ns load response | Targeted for dual-rail systems (e.g., CPU + GPU); requires two independent inductors and feedback networks | Select MAX8743 only when dual independent outputs with tight current matching are required; MAX8764EEP offers superior transient response for single-rail CPU core use. |
| MAX1714 | Single-channel controller with similar pinout but no external current-sense resistor support; relies on MOSFET RDS(on) only | Lower-cost alternative for non-critical applications; lacks adjustable OVP/UVP and has ±2% output accuracy | Choose MAX1714 only for cost-sensitive designs where 100ns response and 1% accuracy are not mandatory; MAX8764EEP provides higher precision and protection flexibility. |
Compared with MAX8743 and MAX1714, the MAX8764EEP delivers the fastest transient response (100ns vs. 500ns/300ns), highest DC accuracy (±1% vs. ±2%), and most flexible protection (adjustable OVP/UVP thresholds), making it optimal for high-performance notebook CPU core supplies where reliability under dynamic load is critical.
Availability
MAX8764EEP is available at Aetrix Electronics and suitable for notebook computer power design, CPU core supply development, and chipset/RAM voltage regulation requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for MAX8764EEP 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 computing, communications, and industrial applications.
The MAX8764EEP belongs to Maxim's notebook power management product line, designed specifically for high-efficiency, fast-transient, multi-rail DC-DC conversion in space-constrained mobile platforms.
FAQ
What is the maximum supported input voltage for the MAX8764EEP?
The MAX8764EEP supports a battery input voltage range of 2V to 28V, with absolute maximum rating of +28V on the V+ pin. This allows direct connection to multi-cell Li-ion batteries (e.g., 3S or 4S packs) without pre-regulation, enabling highest possible conversion efficiency in notebook applications. Operation above 28V risks permanent damage per Absolute Maximum Ratings.
Does the MAX8764EEP require an external 5V bias supply, and why?
Yes, the MAX8764EEP requires an external 4.5V to 5.5V bias supply connected to both VCC and VDD pins. This separates analog control circuitry (VCC) from gate-drive power (VDD), improving noise immunity and efficiency. The bias supply is typically derived from the notebook's main 5V system rail - eliminating on-chip linear regulation saves power and reduces thermal load, which is critical in thermally constrained notebooks.
How does the MAX8764EEP achieve 100ns load-step response?
The MAX8764EEP achieves 100ns load-step response through its Quick-PWM™ architecture: the on-time one-shot triggers instantly upon error comparator output change, with no clock delay or loop compensation phase lag. Combined with fast gate drivers (DH/DL on-resistance ≤5Ω) and minimal propagation delays in the current-sense path, this enables near-instantaneous correction of output voltage deviations during CPU load transients - a capability confirmed in Figure 12A of the MAX8764EEP datasheet.
Can the MAX8764EEP operate with only MOSFET RDS(on) for current sensing, and what is the trade-off?
Yes, the MAX8764EEP supports MOSFET RDS(on)-based current sensing by connecting the CS pin to LX instead of a discrete resistor. This eliminates sense resistor power loss but reduces current-limit accuracy to ±20–30% due to RDS(on) temperature and unit-to-unit variation. For applications requiring precise overcurrent protection (e.g., CPU core), external resistor sensing is recommended; for efficiency-critical, lower-accuracy scenarios (e.g., auxiliary rails), RDS(on) sensing is viable.
What is the function of the TON pin on the MAX8764EEP, and how does it affect design?
The TON pin on the MAX8764EEP selects nominal switching frequency: GND = 600kHz, REF = 450kHz, floating = 300kHz, VCC = 200kHz. This selection directly impacts inductor size (smaller at higher fSW), EMI profile (avoiding sensitive bands like 455kHz), and light-load efficiency (lower fSW improves skip-mode efficiency). Designers must match TON strap to target application priorities - e.g., 600kHz for minimal inductor volume in ultra-thin notebooks.
MAX8764EEP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- Controller, Notebook Power System
- Voltage - Input:
- 2V ~ 28V
- Number of Outputs:
- 1
- Voltage - Output:
- 1V ~ 1.8V, 2.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QSOP
MAX8764EEP FAQ
1.How can I place an order for MAX8764EEP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8764EEP 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 MAX8764EEP reliable?
The price and inventory of MAX8764EEP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8764EEP is usually 5 days.
3.What payment methods are accepted for MAX8764EEP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8764EEP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8764EEP?
MAX8764EEP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8764EEP 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 MAX8764EEP?
For technical support, including MAX8764EEP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8764EEP requirements.
6.How does Aetrix verify that MAX8764EEP is sourced from the original manufacturer or authorized distributors?
All MAX8764EEP 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 MAX8764EEP meets industry standards.
7.What is the process for return or replacement of MAX8764EEP?
All MAX8764EEP units undergo pre-shipment inspection (PSI). If there is an issue with MAX8764EEP, 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 MAX8764EEP part is unused and in its original packaging.
Return procedure for MAX8764EEP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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