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Analog Devices Inc./Maxim Integrated MAX799CSE+
- Part No.:
- MAX799CSE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX799CSE+.pdf
- Description:
- STEP-DOWN CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:1,541
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Product details
Overview
The MAX799CSE+ from Maxim Integrated is a high-performance, synchronous step-down DC-DC controller optimized for dual-output CPU power in battery-powered systems. It delivers up to 10A main output at 3.3V or 5V (adjustable), regulates negative auxiliary outputs (e.g., –5V) via SECFB, operates from 4.5V–30V input, and achieves 96% efficiency using Idle Mode™ pulse-skipping at light loads. It targets notebook/subnotebook computers requiring stable, low-noise, cross-regulated dual-rail supplies.
For engineers reviewing the MAX799CSE+ datasheet, MAX799CSE+ pinout, MAX799CSE+ application, or MAX799CSE+ equivalent, key selection criteria include its negative secondary feedback capability, 300kHz fixed-frequency PWM operation, ±20mV SECFB regulation setpoint for –5V rails, and compatibility with N-channel MOSFETs driven by integrated bootstrap circuitry.
Technical Context
The MAX799CSE+ implements a current-mode PWM controller with direct-summing architecture-no error amplifier-enabling fast transient response (<5 cycles at 300kHz) to dynamic CPU load steps. Its SECFB input is internally referenced to 0V (not 2.505V), enabling precise regulation of negative auxiliary outputs like –5V in flyback-derived topologies.
It features dual-mode feedback (FB pin selects 3.3V/5V/adjustable), automatic VL-to-CSL switchover for bootstrap operation above 4.5V, and a dedicated SKIP input only on MAX797-so MAX799CSE+ operates exclusively in Idle Mode or fixed-frequency PWM without logic-controlled low-noise override.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 30V - supports wide battery input including 12V lead-acid and multi-cell Li-ion stacks. |
| Main Output Voltage | 3.3V or 5V preset, or adjustable 2.5V–6V - configured via FB pin connection or external resistor divider. |
| Secondary Feedback Reference | 0V (for negative outputs) - enables accurate regulation of –5V auxiliary rails without level-shifting circuitry. |
| Efficiency | 96% at full load - achieved via synchronous rectification and Idle Mode™ gate-charge minimization. |
| Oscillator Frequency | 300kHz (SYNC = REF) - fixed frequency ensures predictable EMI profile and simplifies filter design. |
| Quiescent Current | 375µA typical (VIN = 12V, VOUT = 5V) - extends battery runtime during standby/sleep states. |
| Shutdown Current | 1µA typical - meets ultra-low-power system-level shutdown requirements. |
Pinout & Package
MAX799CSE+ is housed in a 16-pin narrow SO package (SOIC-N16), with exposed pad for thermal enhancement. Pin functions are validated per Maxim's official datasheet revision 4 (9/05).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SECFB (Pin 2) | Negative auxiliary output feedback | Regulates at 0V reference - connects directly to resistor divider from –5V rail; must not be left floating. |
| FB (Pin 7) | Main output voltage sense | Dual-Mode™ input: GND = 3.3V, VL = 5V, resistor divider = adjustable mode. |
| VL (Pin 11) | Internal +5V linear regulator output | Powers IC core and gate drivers; switches to main output when VOUT > 4.5V for bootstrap operation. |
| BST (Pin 14) | Bootstrap capacitor node | Drives high-side N-MOSFET gate above LX; requires 0.1µF ceramic capacitor to LX. |
| DH (Pin 16) | High-side gate driver output | Floating driver swinging from LX to BST - enables cost-effective N-channel high-side switch. |
Key Features
| Feature | Design Value |
|---|---|
| Negative secondary regulation | SECFB pin referenced to 0V enables direct –5V rail control without external op-amps or level shifters. |
| Synchronous N-MOSFET drive | DH/DL outputs eliminate external driver ICs and reduce BOM cost while supporting high-current (>10A) buck stages. |
| Automatic bootstrap switchover | VL automatically transitions from internal LDO to main output when VOUT exceeds 4.5V - eliminates external supply sequencing. |
| Idle Mode™ pulse-skipping | Reduces switching frequency and gate-charge losses at light loads - extends battery life without compromising transient response. |
| Precision 2.505V reference | Stable, low-drift reference (±10mV over temp) used for FB and SECFB comparators - ensures tight output regulation accuracy. |
Applications
| Portable Notebook Power | Dual-Rail Embedded Systems |
|---|---|
Use Scenario: Main 3.3V/5V CPU core supply and isolated –5V analog bias rail in subnotebook designs with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Primary step-down controller managing main output and cross-regulating negative auxiliary output via SECFB feedback path. Use Value: Eliminates need for separate negative charge-pump or inverting converter - reduces component count and improves system efficiency by 8–12% versus discrete solutions. | Use Scenario: Dual-output power for FPGA I/O banks (3.3V) and analog front-end (–5V) in portable medical data loggers. IC Role / Device Role / Timing Role: Synchronous buck controller with independent SECFB loop ensuring <±2% cross-regulation between positive and negative rails under varying load conditions. Use Value: Maintains analog signal integrity by holding –5V rail within ±50mV despite 0–8A step changes on 3.3V rail - verified per Figure 13 in datasheet. |
| Industrial Handheld Terminals | Battery-Powered Test Equipment |
Use Scenario: Powering ARM-based processor (3.3V @ 3A) and RS-232 transceiver (–5V @ 100mA) from single 7.2V Li-ion pack. IC Role / Device Role / Timing Role: Single-chip solution providing both rails with shared inductor and transformer-coupled secondary winding. Use Value: Achieves >92% system efficiency across 10%–100% load range - critical for 8-hour continuous operation on compact battery packs. | Use Scenario: Portable oscilloscope with 3.3V digital logic and –5V ADC reference supply, operating from 12V sealed lead-acid battery. IC Role / Device Role / Timing Role: High-PSRR controller delivering clean, low-noise –5V rail with <10mVpp ripple even during 2A digital load transients. Use Value: Enables 12-bit ADC accuracy by limiting reference rail noise contribution to <0.05% FS - confirmed by typical operating characteristics curves. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX796CSE+ | SECFB referenced to 2.505V (positive auxiliary regulation); no SKIP pin; identical pinout and package. | Designed for +12V or +5V auxiliary rails - unsuitable for negative outputs without external level-shifting. | Select MAX796CSE+ only when regulating positive secondary voltages; MAX799CSE+ is mandatory for –5V rails. |
| TPS54620RGYR | Single-output, 6A synchronous buck; no SECFB; integrated MOSFETs; 2.95V–17V input. | Lacks dual-output cross-regulation capability - requires separate controller or charge-pump for negative rails. | Choose TPS54620RGYR for cost-sensitive, single-rail applications where board space permits discrete negative generation. |
Compared with MAX796CSE+, MAX799CSE+ provides unique 0V-referenced SECFB for native negative rail control, while TPS54620RGYR trades dual-output capability for higher integration and lower external component count in single-output systems.
Availability
MAX799CSE+ is available at Aetrix Electronics and suitable for notebook computers, portable medical devices, industrial handheld terminals, and battery-powered test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for MAX799CSE+ 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 precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.
The MAX799CSE+ belongs to Maxim's high-efficiency CPU power controller family, engineered specifically for battery-powered systems needing tightly regulated dual-rail supplies with minimal quiescent current and robust transient response.
FAQ
What is the function of the SECFB pin on the MAX799CSE+?
The SECFB pin on the MAX799CSE+ serves as the secondary feedback input for regulating negative auxiliary outputs such as –5V. Unlike the MAX796, the MAX799CSE+ references SECFB to 0V-not 2.505V-enabling direct connection to a resistor divider from the negative rail. Leaving SECFB unconnected is prohibited; if unused, it must be tied to a negative voltage through a current-limiting resistor (≤100µA), per datasheet guidance.
Can the MAX799CSE+ regulate a +12V auxiliary output?
No, the MAX799CSE+ cannot natively regulate a +12V auxiliary output. Its SECFB pin is designed for 0V-referenced negative regulation (e.g., –5V). For positive auxiliary rails like +12V, the MAX796CSE+-which references SECFB to 2.505V-is the appropriate variant. Using MAX799CSE+ for positive secondaries would require external level-shifting circuitry and invalidate cross-regulation performance.
Does the MAX799CSE+ support programmable soft-start?
Yes, the MAX799CSE+ supports programmable soft-start via the SS pin (Pin 1). Connecting an external capacitor between SS and GND sets the ramp time to full current limit at approximately 1ms/nF. This feature prevents inrush current during startup and ensures controlled voltage rise on both main and auxiliary outputs, critical for protecting downstream logic and analog circuitry in portable systems.
What is the maximum duty cycle supported by the MAX799CSE+?
The MAX799CSE+ supports a maximum duty cycle of 96% (typical), as specified in the Electrical Characteristics table. This allows operation down to VIN/VOUT ratios as low as ~1.04, enabling efficient regulation from 5V input to 4.8V output or 12V input to 11.5V output-useful in post-regulation or low-dropout scenarios where input and output voltages are closely matched.
Is the MAX799CSE+ pin-compatible with the MAX797CSE+?
No, the MAX799CSE+ is not pin-compatible with the MAX797CSE+. While both share the same 16-pin narrow SO package and most signal pins, the MAX797CSE+ includes a dedicated SKIP pin (Pin 2) for low-noise mode control, whereas the MAX799CSE+ uses Pin 2 as SECFB. Swapping them would connect SECFB to the wrong net and disable negative rail regulation-physical insertion is possible but electrically invalid.
MAX799CSE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- Controller, CPU
- Voltage - Input:
- 4.5V ~ 30V
- Number of Outputs:
- 1
- Voltage - Output:
- 3.3V ~ 6V, 5V ~ 6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX799CSE+ FAQ
1.How can I place an order for MAX799CSE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX799CSE+ 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 MAX799CSE+ reliable?
The price and inventory of MAX799CSE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX799CSE+ is usually 5 days.
3.What payment methods are accepted for MAX799CSE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX799CSE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX799CSE+?
MAX799CSE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX799CSE+ 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 MAX799CSE+?
For technical support, including MAX799CSE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX799CSE+ requirements.
6.How does Aetrix verify that MAX799CSE+ is sourced from the original manufacturer or authorized distributors?
All MAX799CSE+ 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 MAX799CSE+ meets industry standards.
7.What is the process for return or replacement of MAX799CSE+?
All MAX799CSE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX799CSE+, 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 MAX799CSE+ part is unused and in its original packaging.
Return procedure for MAX799CSE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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