My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1542ETP
- Part No.:
- MAX1542ETP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX1542ETP.pdf
- Description:
- TFT-LCD DC-DC CONVERTERS
- Quantity:
- Payment:
- Shipping:
Inventory:4,455
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX1542ETP from Maxim Integrated is a TFT LCD DC-to-DC converter IC integrating a 1.2MHz current-mode boost regulator, two rail-to-rail operational amplifiers (±150mA short-circuit current, 7.5V/µs slew rate), and a logic-controlled high-voltage switch with adjustable delay-designed for VCOM and gamma correction in ultra-thin notebook and automotive display panels.
For engineers reviewing the MAX1542ETP datasheet, MAX1542ETP pinout, MAX1542ETP application, or MAX1542ETP equivalent, this device delivers fast transient response to pulsed source-driver loads, 85%+ efficiency at 250mA, ±1.3% output voltage regulation, and thermal/fault protection in a 5mm × 5mm × 0.8mm thin QFN package-critical for space-constrained LCD power architectures.
Technical Context
The MAX1542ETP employs a fixed-frequency, current-mode PWM architecture for its main step-up regulator, enabling fast load-transient response (≤10µs recovery) and stable operation with ceramic output capacitors and low-profile inductors. Its integrated 1.2A/0.2Ω N-channel MOSFET eliminates external switching elements.
The dual op-amps operate from a separate SUP rail (4.5V–13V), feature unity-gain stability, 12MHz –3dB bandwidth, and rail-to-rail I/O-optimized for driving capacitive LCD backplane (VCOM) and resistive gamma-divider networks without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Regulator Frequency | 1.2MHz fixed-enables use of 4.7µH inductors and reduces EMI filtering burden in slim-panel layouts. |
| FB Regulation Voltage | 1.24V ±1.3%-supports precise VMAIN setting from VIN to 13V via external resistor divider. |
| Op-Amp Slew Rate | 7.5V/µs-ensures <500ns settling for 4V steps, critical for gamma-correction fidelity in high-resolution TFTs. |
| Op-Amp Short-Circuit Current | ±150mA-handles peak VCOM charge/discharge transients without latch-up or thermal shutdown. |
| Input Voltage Range | 2.6V to 5.5V-compatible with single-cell Li-ion, USB, or 3.3V/5V system rails. |
| Quiescent Current | 3.6mA (switching), 0.45mA (standby)-minimizes battery drain during panel idle states. |
| Thermal Shutdown Threshold | +160°C with 15°C hysteresis-prevents permanent damage during sustained overloads in sealed displays. |
Pinout & Package
MAX1542ETP is housed in a 20-pin thin QFN package (5mm × 5mm × 0.8mm), optimized for ultra-thin LCD panel integration. Pin 1 is COM; pins 3, 15, and 20 are no-connect (N.C.). I.C. (pin 3) is an internal connection-must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COM | High-voltage switch common terminal | Shared node for SRC–COM and DRN–COM switching paths; voltage must not exceed VSRC. |
| 2 SRC | Switch input (P-channel source) | Connects to high-voltage supply (e.g., +22V); requires local 0.1µF bypass to PGND. |
| 4 PGND | Power ground | Source of internal N-MOSFET; must tie directly to output capacitor ground with low-inductance trace. |
| 5 AGND | Analog ground | Reference for FB, COMP, op-amp inputs; connect to PGND under IC for noise isolation. |
| 6 POS1 / 11 POS2 | Op-amp noninverting inputs | Accept gamma-divider tap points or VCOM reference; rail-to-rail CMVR (0 to VSUP). |
| 8 OUT1 / 9 OUT2 | Op-amp outputs | Drive VCOM or gamma string; deliver ±150mA into capacitive loads with 7.5V/µs slew. |
| 12 SUP | Op-amp supply rail | Independent 4.5V–13V input (typically tied to VMAIN); bypassed with 0.1µF to AGND. |
| 13 LX | Switching node | Drain of internal N-MOSFET; connects to inductor and catch diode-minimize loop area for EMI control. |
| 14 IN | Main input supply | 2.6V–5.5V input powering boost controller; UVLO triggers at 2.35V falling threshold. |
| 16 FB | Feedback input | Senses VMAIN via resistor divider; regulates to 1.24V with ±1.3% accuracy across temperature. |
| 17 COMP | Error amplifier compensation | Connect RC network (e.g., 120kΩ + 470pF) to AGND for loop stability with ceramic output caps. |
| 18 DEL | Delay timing input | 5µA current source charges external capacitor; delay starts after VDEL > 1.24V (e.g., 100nF = ~20ms). |
| 19 CTL | High-voltage switch control | Logic-level input enabling SRC–COM path when high; inhibited until VDEL > 1.24V and VIN > UVLO. |
Key Features
| Feature | Design Value |
|---|---|
| 8-step digital soft-start | 14ms duration with ILIM/8 current stepping-limits inrush into large VCOM capacitance without external circuitry. |
| Rail-to-rail op-amp I/O | Full swing from AGND to SUP enables maximum gamma voltage range and VCOM headroom in 8V–13V systems. |
| Lossless current sensing | Integrated sense FET with 0.5Ω transresistance eliminates external sense resistor and associated power loss. |
| Timer delay latch fault protection | Auto-shutdown if VMAIN remains below trip level for 55ms-prevents latch-up during open-feedback faults. |
| Thermal shutdown with hysteresis | +160°C trip with +145°C release-avoids oscillation during thermal overload in enclosed display enclosures. |
Applications
| Notebook Computer Displays | LCD Monitor Panels |
|---|---|
Use Scenario: Driving VCOM and gamma correction in 13.3"–15.6" IPS LCDs with 1920×1080 resolution and 60Hz refresh. IC Role / Device Role / Timing Role: Single-chip power + analog solution generating +8V VCOM and regulating gamma string bias from 3.3V input. Use Value: Eliminates discrete op-amps and boost controllers, reducing BOM count by 7 components and PCB area by 25mm². |
Use Scenario: Powering 24"–27" commercial monitors requiring stable +8V VCOM and ±7V gate drivers under variable ambient temperature. IC Role / Device Role / Timing Role: Dual op-amp drives distributed VCOM capacitance while boost regulator maintains 250mA load with <100mV droop. Use Value: 85% efficiency at full load extends thermal margin; rail-to-rail output ensures gamma linearity across 0–100% brightness. |
| Car Navigation Displays | PDA Displays |
Use Scenario: Operating in automotive cabin environments (−40°C to +85°C) with 12V battery input stepped to 3.3V/5V. IC Role / Device Role / Timing Role: Boost regulator supplies clean +8V for VCOM; op-amps reject engine noise via 90dB CMRR and 100dB PSRR. Use Value: Thermal shutdown and UVLO prevent malfunction during cold cranking (4.5V dips) or hot soak conditions. |
Use Scenario: Enabling compact, battery-powered handheld devices with 320×240–640×480 TFTs and tight thickness constraints (<8mm). IC Role / Device Role / Timing Role: Thin QFN package (0.8mm max height) and 5mm × 5mm footprint allow direct placement behind display glass. Use Value: 0.45mA quiescent current in standby extends single-cell Li-ion runtime beyond 120 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TFT LCD power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1543ETP | Pin-selectable 640kHz/1.2MHz switching frequency; adds DRN pin and COM–PGND pulldown switch. | Supports dual-gate driver topologies (e.g., +22V/−7V) requiring independent high-side/low-side control. | Select MAX1543ETP only if adjustable frequency or back-to-back P-MOSFET switching (SRC/DRN/COM) is required. |
| TPS65105RGER | Separate 1.5MHz boost + dual 120mA op-amps; no integrated DEL/CTL timing block or high-voltage switch. | Lacks programmable delay and logic-controlled HV switching-requires external MOSFETs for gate driver sequencing. | Choose TPS65105RGER when system uses discrete HV switches and prioritizes higher op-amp bandwidth (15MHz) over integrated timing. |
Compared with MAX1543ETP, MAX1542ETP offers simpler control (no DRN pin) and fixed 1.2MHz operation-reducing layout complexity for VCOM-only designs. Versus TPS65105RGER, MAX1542ETP integrates delay timing and HV switching, eliminating four external components but trades off some op-amp bandwidth.
Availability
MAX1542ETP is available at Aetrix Electronics and suitable for notebook computer displays, automotive navigation panels, and industrial LCD monitor designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1542ETP 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 demanding applications.
The MAX1542ETP belongs to Maxim's TFT LCD power management product line, engineered specifically to consolidate boost conversion, VCOM/gamma amplification, and high-voltage timing control into a single ultra-thin package for next-generation flat-panel displays.
FAQ
What is the maximum output voltage capability of the MAX1542ETP boost regulator?
The MAX1542ETP boost regulator supports an output voltage range from VIN up to 13V, set via an external resistor divider connected to the FB pin. Its 1.24V feedback reference and ±1.3% regulation accuracy ensure stable VMAIN generation-for example, +8V at 250mA for VCOM bias in notebook displays-across input voltages from 2.6V to 5.5V and temperatures from −40°C to +85°C.
Can the MAX1542ETP drive pure capacitive loads like LCD VCOM without external compensation?
Yes, the MAX1542ETP op-amps are designed to drive typical LCD VCOM loads (distributed RC networks) without compensation. For pure capacitive loads exceeding 100pF, a small series resistor (5Ω–50Ω) between OUT1/OUT2 and the load suppresses peaking while preserving gain; alternatively, a 150Ω/10nF snubber can be used. The 12MHz bandwidth and 7.5V/µs slew rate maintain stability under these conditions per Figure 20–22 in the datasheet.
How does the DEL pin function in the MAX1542ETP startup sequence?
The DEL pin in MAX1542ETP controls a programmable startup delay for the high-voltage switch: a 5µA internal current source charges an external capacitor (CDEL) from AGND. When VDEL exceeds 1.24V, the CTL-controlled SRC–COM switch activates. For example, a 100nF capacitor yields ~20ms delay. This prevents premature gate-driver activation before VMAIN reaches regulation-ensuring safe sequencing in TFT panels.
What protection features are built into the MAX1542ETP?
The MAX1542ETP integrates undervoltage lockout (UVLO: 2.35V falling threshold), timer-based fault latch (55ms timeout if FB falls below 1.04V), thermal shutdown (+160°C trip with 15°C hysteresis), and op-amp short-circuit current limiting (±150mA). These features autonomously disable the boost regulator and HV switch during faults, requiring only an IN voltage cycle below UVLO to reset-critical for unattended display systems.
Is the MAX1542ETP pin-compatible with the MAX1543ETP?
No, MAX1542ETP and MAX1543ETP are not pin-compatible. MAX1543ETP substitutes pin 20 (DRN) for MAX1542ETP's N.C. pin and repurposes pin 15 (I.C.) as FREQ-adding frequency select capability but removing the dedicated no-connect. Layouts must be redesigned when substituting; refer to Figures 1 and 2 in the datasheet for exact pin mappings and application circuit differences.
MAX1542ETP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- Controller, TFT LCD
- Voltage - Input:
- 2.6V ~ 5.5V
- Number of Outputs:
- 2
- Voltage - Output:
- 2.6V ~ 13V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX1542ETP FAQ
1.How can I place an order for MAX1542ETP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1542ETP 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 MAX1542ETP reliable?
The price and inventory of MAX1542ETP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1542ETP is usually 5 days.
3.What payment methods are accepted for MAX1542ETP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1542ETP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1542ETP?
MAX1542ETP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1542ETP 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 MAX1542ETP?
For technical support, including MAX1542ETP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1542ETP requirements.
6.How does Aetrix verify that MAX1542ETP is sourced from the original manufacturer or authorized distributors?
All MAX1542ETP 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 MAX1542ETP meets industry standards.
7.What is the process for return or replacement of MAX1542ETP?
All MAX1542ETP units undergo pre-shipment inspection (PSI). If there is an issue with MAX1542ETP, 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 MAX1542ETP part is unused and in its original packaging.
Return procedure for MAX1542ETP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1542ETP Tags
-
TPS51206DSQR
Texas Instruments
-
TPS51200DRCR
Texas Instruments
-
TPS51200DRCT
Texas Instruments
-
TPS62740DSSR
Texas Instruments
-
TPS51100DGQR
Texas Instruments
-
NCP51200MNTXG
onsemi
-
NCP51400MNTXG
onsemi
-
RT9026GSP
Richtek USA Inc.
-
LP2998MRX/NOPB
Texas Instruments
-
TPS51200QDRCRQ1
Texas Instruments
-
DPA423GN-TL
Power Integrations
-
LM10011SD/NOPB
Texas Instruments
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…
