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MAX1889
Triple-Output TFT LCD Power Supply with Fault Protection
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Status
Active: In Production.
Description
The MAX1889 provides the three regulated output voltages required for active matrix, thin-film transistor liquid crystal displays (TFT LCDs). It combines a high-performance step-up regulator with two linear-regulator controllers and multiple levels of protection circuitry for a complete power-supply system.
The main DC-DC converter is a high-frequency (500kHz/1MHz), current-mode step-up regulator with an integrated N-channel power MOSFET that allows the use of ultra-small inductors and ceramic capacitors. With its high closed-loop bandwidth performance, the MAX1889 provides fast transient response to pulsed loads while operating with efficiencies over 85%. The positive and negative linear-regulator controllers post-regulate charge-pump outputs for TFT gate-on and gate-off supplies.
The MAX1889 has a unique input switch control that can replace the typical input fuse by disconnecting the load from the input supply when a fault is detected. The fault detector monitors all three regulated output voltages and can monitor current from the input supply as well. Additionally, the MAX1889 enters thermal shutdown when its overtemperature threshold is reached.
The MAX1889 undervoltage lockout is set at 2.5V (max) to allow the input supply to droop under pulsed load conditions while avoiding any unexpected behavior when its input voltage dips momentarily. Also, the built-in soft-start and cycle-by-cycle current limiting prevent input surge currents during power-up.
The MAX1889 is available in a 16-pin thin QFN package with a maximum thickness of 0.8mm for ultra-thin LCD panel design.
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Data Sheet
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An evaluation kit is available: MAX1889EVKIT
Key Features
- High-Performance Step-Up Regulator
- Fast Transient Response
- Current-Mode Control Architecture
- Built-In High-Efficiency N-Channel Power MOSFET
- Current-Limit Comparator > 85% Efficiency
- Selectable Switching Frequency (500kHz/1MHz)
- Internal Soft-Start
- Positive Linear-Regulator Controller
- Negative Linear-Regulator Controller
- Triple-Level Protection Against Smoke or Fire
- Input Switch Replaces Input Fuse
- Output Overload Detection with Timer Latch
- Thermal Shutdown
- 2.7V to 5.5V Input Operating Range
- Ultra-Small External Components
- 1µA Shutdown Current (max)
- 1mA Quiescent Current (max)
- Ultra-Thin 16-Pin QFN Package
(0.8mm Maximum Thickness)
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Applications/Uses
- Car-Navigation Displays
- LCD Monitors
- Notebook Computer Displays
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Key Specifications:
| Multifunction PMICs |
| Part Number |
Primary Topology |
Monitor/Control Features |
DC-DC/Power Features |
LCD/LED/Flash/CCD Features |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Max. IOUT
(A) |
Max. IOUT
(A) |
Oper. Freq.
(kHz) |
Inverting Outputs |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≥ |
≤ |
max w/pins |
See Notes |
| MAX1889 |
Step-Up |
| Output UVP | | Reset Output | | Shutdown |
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| Adj. Frequency | | Current Limit | | Fixed Freq./PWM | | Internal Pwr. FETs | | Soft Start |
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TFT Bias |
2.7 |
5.5 |
2.7 |
13 |
0.3 |
0.3 |
1000 |
1 |
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26 |
$1.17 @1k |
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See All Multifunction PMICs (96)
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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
 Typical 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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| MAX1889ETE
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Active |
TQFN;16 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0073 (PDF)
Use pkgcode/variation: T1655-3*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1889ETE+
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Active |
TQFN;16 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0073 (PDF)
Use pkgcode/variation: T1655+3*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1889ETE+T
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Active |
TQFN;16 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0073 (PDF)
Use pkgcode/variation: T1655+3*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1889ETE-T
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Active |
QFN;16 pin
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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More Information
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Information Index
Document Ref.: 19-2485
Rev 1;
2002-12-10
This page last modified: 2008-03-12
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