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Data Sheet

FULL DATA SHEET (PDF, 228kB) Download   E-Mail

Description

The MAX1748/MAX8726 triple-output DC-DC converters in a low-profile TSSOP package provide the regulated voltages required by active-matrix, thin-film transistor (TFT) liquid-crystal displays (LCDs). One high-power DC-DC converter and two low-power charge pumps convert the +3.3V to +5V input supply voltage into three independent output voltages. The primary 1MHz DC-DC converter generates a boosted output voltage (VMAIN) up to 13V using ultra-small inductors and ceramic capacitors. The low-power BiCMOS control circuitry and the low on-resistance (0.35Ω) of the integrated power MOSFET allows efficiency up to 93%. The dual charge pumps independently regulate one positive output (VPOS) and one negative output (VNEG). These low-power outputs use external diode and capacitor stages (as many stages as required) to regulate output voltages up to +40V and down to -40V. A proprietary regulation algorithm minimizes output ripple, as well as capacitor sizes for both charge pumps. For both the MAX1748 and MAX8726, the supply sequence is VMAIN first, VNEG next, and finally VPOS. The MAX1748 soft-starts each supply as soon as the previous supply finishes. The MAX8726 adds a delay between the startups of VMAIN and VNEG and also between VNEG and VPOS. The MAX1748/MAX8726 are available in the ultra-thin TSSOP package (1.1mm max height).

Key Features		Applications/Uses
Three Integrated DC-DC Converters 1MHz Current-Mode PWM Boost Regulator Up to +13V Main High-Power Output ±1% Accuracy High Efficiency (93%) Dual Charge-Pump Outputs Up to +40V Positive Charge-Pump Output Down to -40V Negative Charge-Pump Output Internal Supply Sequencing Internal Power MOSFETs +2.7V to +5.5V Input Supply 0.1µA Shutdown Current 0.6mA Quiescent Current Internal Soft-Start Power-Ready Output Ultra-Small External Components Thin TSSOP Package (1.1mm max)		Camcorders Digital Still Cameras Passive-Matrix LCD Displays PDAs TFT Active-Matrix LCD Displays

Diagram

Typical Operating Circuit

Evaluation Kits

MAX1748EVKIT

Design Guides

Displays (PDF)

Reliability Reports

Show FIT data for: MAX1748 MAX8726 Request Reliability Report for: MAX1748 MAX8726

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-6 of 6
MAX1748	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1748EUE			TSSOP;16 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1748EUE-T			TSSOP;16 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1748EUE+			TSSOP;16 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1748EUE+T			TSSOP;16 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8726	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8726EUE			TSSOP;16 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8726EUE-T			Land Pattern: Not Available	-40°C to +85°C	See data sheet

More Information

New Product Press Release 2004-11-19

Related Products

MAX1664 Active Matrix Liquid Crystal Display (AMLCD) Supply MAX1779 Low-Power Triple-Output TFT LCD DC-DC Converter MAX1889 Triple-Output TFT LCD Power Supply with Fault Protection MAX1790, MAX8715 Low-Noise Step-Up DC-DC Converters MAX1997, MAX1998 Quintuple/Triple-Output TFT LCD Power Supplies with Fault Protection and VCOM Buffer MAX1778, MAX1880, MAX1881, MAX1882, MAX1883, MAX1884, MAX1885 Quad-Output TFT LCD DC-DC Converters with Buffer

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