My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1790EUA
- Part No.:
- MAX1790EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1790EUA.pdf
- Description:
- IC REG BST SEPIC ADJ 1.2A 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,363
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1790EUA from Maxim Integrated is a high-efficiency, current-mode, fixed-frequency boost DC-DC converter with an integrated 1.6A/0.21Ω n-channel MOSFET, 1.2MHz/640kHz selectable switching frequency, 2.6V–5.5V input range, and adjustable output up to 12V - designed for space-constrained portable LCD power supplies.
For engineers reviewing the MAX1790EUA datasheet, MAX1790EUA pinout, MAX1790EUA application, or MAX1790EUA equivalent, key selection criteria include its programmable soft-start, external compensation flexibility, ultra-low 0.1µA shutdown current, 8-pin µMAX package height <1.1mm, and verified performance in AMLCD bias generation.
Technical Context
The MAX1790EUA implements a current-mode PWM architecture with slope compensation for stability at high duty cycles, enabling fast transient response and low-noise operation. Its error amplifier (1.24V reference, 70–260µS transconductance) drives COMP to control peak inductor current via internal current sensing (0.30–0.65V/A transresistance).
Switching frequency is selected by FREQ pin logic level (GND = 640kHz, IN = 1.2MHz), and soft-start is controlled by external capacitor charging at 4µA to limit inrush. Shutdown disables bias circuitry while maintaining 0.1µA quiescent draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 5.5V - supports single-cell Li+ and 3.3V system rails without pre-regulation. |
| Output Voltage Range | Adjustable from VIN to 12V - set via resistor divider on FB pin; enables flexible bias generation for LCD VGH/VGL. |
| Switching Frequency | 640kHz or 1.2MHz (pin-selectable) - allows optimization of inductor size, EMI filtering, and loop bandwidth. |
| Integrated MOSFET | 1.6A, 0.21Ω, 14V-rated n-channel - reduces external component count and conduction losses in compact layouts. |
| Shutdown Current | 0.1µA - enables battery-critical applications requiring ultra-low standby power. |
| Feedback Reference | 1.24V ±1.5% - ensures precise output regulation across temperature and load conditions. |
| Soft-Start Control | Programmable via external capacitor (CSS) charged at 4µA - prevents inrush current and output overshoot during power-up. |
Pinout & Package
MAX1790EUA is housed in an 8-pin µMAX® package (3.0mm × 3.0mm × 1.1mm max height), optimized for low-profile portable designs. Pin assignments are validated per Maxim's official datasheet (Rev 3, 9/05).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Compensation node for error amplifier | Connects external R-C network to stabilize feedback loop; sets integrator zero and high-frequency gain. |
| 2 - FB | Feedback input | Senses output voltage divider; 1.24V reference enables precise output regulation (VOUT = 1.24V × (1 + R1/R2)). |
| 3 - SHDN | Active-low shutdown control | Pulls low to disable regulator; draws only 0.001–1µA, reducing total supply current to 0.1µA. |
| 4 - GND | Analog and power ground | Star-ground connection point; must be routed separately from high-current LX return to minimize noise coupling. |
| 5 - LX | Switch node | Drives external inductor/catch diode; requires short, low-inductance trace to reduce EMI and switching losses. |
| 6 - IN | Input supply | Accepts 2.6–5.5V; must be bypassed with ≥1µF ceramic capacitor directly to GND for stable operation. |
| 7 - FREQ | Frequency select input | Logic level selects oscillator: GND = 640kHz, IN = 1.2MHz; internal 5µA pulldown enables default 640kHz if left open. |
| 8 - SS | Soft-start control | Charged at 4µA to 0.5–1.5V range; linearly scales peak inductor current from 0A to full limit during startup. |
Key Features
| Feature | Design Value |
|---|---|
| 90% peak efficiency | Enables minimal thermal rise in sealed handheld enclosures; verified at 3.3V→12V, 250mA, 640kHz. |
| External loop compensation | Allows tuning of transient response and stability for diverse output capacitors (tantalum, ceramic, or hybrid). |
| Programmable soft-start | Prevents input voltage sag and output overshoot in multi-rail systems; eliminates need for external sequencing ICs. |
| Low-noise step-up topology | Current-mode control with slope compensation suppresses subharmonic oscillation and improves EMI profile. |
| Ultra-small solution footprint | 8-pin µMAX package + high-frequency operation enable total solution height <1.1mm - critical for slim LCD modules. |
Applications
| AMLCD Panel Bias Supply | PCMCIA Card Power Management |
|---|---|
|
Use Scenario: Generating +12V and –9V bias rails for active-matrix LCD panels in portable medical displays. IC Role / Device Role / Timing Role: Primary boost controller regulating VGH; synchronizes with gate driver timing to avoid display flicker. Use Value: 1.2MHz operation enables use of 5.4µH inductors and 3×3.3µF ceramic output caps, achieving <1.2mm total height. |
Use Scenario: Providing regulated 5V/3.3V from 3.3V host bus in hot-pluggable PCMCIA memory cards. IC Role / Device Role / Timing Role: Standby-enabled boost converter activated only during card insertion; responds within 100µs to load steps. Use Value: 0.1µA shutdown current extends host battery life; programmable soft-start prevents bus voltage droop during enumeration. |
| Handheld Diagnostic Instrument | Portable Barcode Scanner |
|
Use Scenario: Powering CCD image sensor and analog front-end requiring clean 9V rail from 3.3V Li+ battery. IC Role / Device Role / Timing Role: Low-noise DC-DC source feeding precision ADC reference; operates in skip mode at light loads. Use Value: 640kHz switching + external compensation yields <10mVpp output ripple at 150mA, meeting sensor SNR requirements. |
Use Scenario: Delivering 12V to laser diode driver in battery-powered handheld barcode scanners. IC Role / Device Role / Timing Role: High-current boost stage triggered only during scan pulses; handles 200mA pulsed loads. Use Value: Integrated 1.6A MOSFET eliminates discrete switch; 1.2MHz mode reduces inductor size by 50% vs. 640kHz designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8715EUA | Higher current capability (2.4A/0.15Ω MOSFET), lower RON, higher ILIM - but same pinout and package. | Better suited for >200mA continuous loads (e.g., larger LCD panels); shares identical layout and compensation design. | Select MAX8715EUA when output current exceeds 200mA or lower conduction loss is required at high duty cycle. |
| TPS61088RHLR | Wider input range (2.7–12V), higher output (19.5V), integrated soft-start - but different pinout and no FREQ select. | Supports wider battery voltage ranges and higher output voltages; lacks pin-selectable frequency and external compensation flexibility. | Choose TPS61088RHLR for designs needing >12V output or operation down to 2.7V; re-layout required due to non-compatible pin mapping. |
Compared with MAX8715EUA, MAX1790EUA offers lower peak current and higher RON but identical footprint and control interface; versus TPS61088RHLR, it provides superior loop tuning freedom and smaller solution height, though with narrower input/output range.
Availability
MAX1790EUA is available at Aetrix Electronics and suitable for LCD displays, PCMCIA cards, and hand-held devices requiring stable component supply, extended temperature support (–40°C to +85°C), and long-term production continuity.
Supply support for MAX1790EUA 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, medical, and portable applications.
The MAX1790EUA belongs to Maxim's low-noise step-up DC-DC converter family, engineered specifically for ultra-thin LCD bias supplies and battery-powered systems where efficiency, size, and startup control are critical.
FAQ
What is the maximum output voltage achievable with the MAX1790EUA?
The MAX1790EUA supports an adjustable output voltage ranging from the input voltage (VIN) up to 12V. This is achieved using an external resistor divider connected to the FB pin, where VOUT = 1.24V × (1 + R1/R2). The device maintains regulation and efficiency up to 12V under typical operating conditions (e.g., 3.3V input, 250mA load, 640kHz switching), as confirmed in the datasheet's Typical Operating Characteristics (Figure MAX1790 toc05).
Does the MAX1790EUA require external compensation components?
Yes, the MAX1790EUA requires external compensation components connected to the COMP pin: a series RC network (RCOMP and CCOMP) plus an optional CCOMP2 capacitor. These components stabilize the feedback loop, prevent oscillation, and optimize transient response. Values depend on inductor, output capacitor, and load; Table 1 in the datasheet provides experimentally verified values for common configurations like 3.3V→12V at 640kHz.
How does the FREQ pin affect MAX1790EUA operation?
The FREQ pin selects the switching frequency: pulling FREQ to GND sets 640kHz; connecting it to IN selects 1.2MHz. An internal 5µA pulldown ensures default 640kHz operation if the pin is left unconnected. Higher frequency enables smaller inductors and capacitors, reducing solution size and height - critical for ultra-thin LCD modules - while 640kHz improves light-load efficiency and EMI filtering ease.
Can the MAX1790EUA be used in SEPIC topology?
Yes, the MAX1790EUA is explicitly validated in SEPIC configuration (Figure 3 of the datasheet), enabling single-cell Li+ (2.6V–4.2V) to regulated 3.3V output where input may fall below or rise above output. This requires two coupled inductor windings (L1A/L1B), a low-ESR coupling capacitor, and adjusted compensation. The current-mode architecture and wide input range make it suitable for this non-inverting buck-boost implementation.
What is the purpose of the SS pin on the MAX1790EUA?
The SS (soft-start) pin controls inrush current during power-up by linearly ramping the peak inductor current from 0A to full limit. A capacitor (CSS) is charged at 4µA from 0.5V to 1.5V; full current is reached after t = 2.5 × 10⁵ × CSS seconds. This prevents output overshoot and input voltage sag - especially important in multi-rail systems - and eliminates need for external sequencing circuitry in handheld and diagnostic devices using MAX1790EUA.
MAX1790EUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.6V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 1.2A (Switch)
- Frequency - Switching:
- 640kHz, 1.22MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX1790EUA FAQ
1.How can I place an order for MAX1790EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1790EUA 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 MAX1790EUA reliable?
The price and inventory of MAX1790EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1790EUA is usually 5 days.
3.What payment methods are accepted for MAX1790EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1790EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1790EUA?
MAX1790EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1790EUA 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 MAX1790EUA?
For technical support, including MAX1790EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1790EUA requirements.
6.How does Aetrix verify that MAX1790EUA is sourced from the original manufacturer or authorized distributors?
All MAX1790EUA 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 MAX1790EUA meets industry standards.
7.What is the process for return or replacement of MAX1790EUA?
All MAX1790EUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1790EUA, 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 MAX1790EUA part is unused and in its original packaging.
Return procedure for MAX1790EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1790EUA Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
