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MAX8758
Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD
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Status
Active: In Production.
Description
The MAX8758 includes a high-performance step-up regulator,
a high-speed operational amplifier, and a logic-controlled,
high-voltage switch-control block with programmable
delay. The device is optimized for thin-film
transistor (TFT) liquid-crystal display (LCD) applications.
The step-up DC-DC regulator provides the regulated supply
voltage for the panel source driver ICs. The converter
is a high-frequency (640kHz/1.2MHz), current-mode regulator
with an integrated 14V n-channel power MOSFET.
The high-switching frequency allows the use of ultra-small
inductors and ceramic capacitors. The current-mode control
architecture provides fast transient response to pulsed
loads. The regulator achieves efficiencies over 85% by
bootstrapping the supply rail of the internal gate driver
from the step-up regulator output. The step-up regulator
features undervoltage lockout (UVLO), soft-start, and
internal current limit. The high-current operational amplifier
is designed to drive the LCD backplane (VCOM). The
amplifier features high output current (±150mA), fast slew
rate (7.5V/µs), wide bandwidth (12MHz), and rail-to-rail
inputs and outputs.
The MAX8758 is available in a 24-pin, 4mm x 4mm, thin
QFN package with a maximum thickness of 0.8mm for
ultra-thin LCD panels. The device operates over the
-40°C to +85°C temperature range.
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Data Sheet
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An evaluation kit is available: MAX8758EVKIT
Key Features
- 1.8V to 5.5V Input Voltage Range
- Input Undervoltage Lockout
- 0.5mA Quiescent Current
- 640kHz/1.2MHz Current-Mode Step-Up Regulator
- Fast Transient Response
- High-Accuracy Output Voltage (1.5%)
- Built-In 14V, 2.5A, 115mΩ MOSFET
- High Efficiency
- Programmable Soft-Start
- Current Limit with Lossless Sensing
- Timer-Delay Fault Latch
- High-Speed Operational Amplifier
- ±150mA Output Current
- 7.5V/µs Slew Rate
- 12MHz, -3dB Bandwidth
- Rail-to-Rail Inputs/Outputs
- Dual Mode™, Logic-Controlled, High-Voltage Switch with Programmable Delay
- Thermal-Overload Protection
- 24-Pin, 4mm x 4mm, Thin QFN Package
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Applications/Uses
- LCD Monitors
- Notebook Displays
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Key Specifications:
| Step-Up Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Max. IOUT
(A) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≥ |
≤ |
max w/pins |
See Notes |
| MAX8758 |
1.8 |
5.5 |
4.5 |
13 |
2 |
2 |
PWM |
1 |
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16.8 |
$1.49 @1k |
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See All Step-Up Switching Regulators (91)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Simplified Operating Circuit
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX8758ETG+
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Active |
TQFN;24 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX8758ETG+T
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Active |
TQFN;24 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX8758ETJ
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Active |
TQFN;
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.
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Information Index
Document Ref.: 19-3699
Rev 1;
2005-09-23
This page last modified: 2007-04-18
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