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MAX1997, MAX1998
Quintuple/Triple-Output TFT LCD Power Supplies with Fault Protection and VCOM Buffer
Quintuple-/Triple-Output TFT LCD Power Supplies with Fault Protection and VCOM Buffer
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Status
Active: In Production.
Description
The MAX1997/MAX1998 provide the voltages required for active-matrix, thin-film transistor liquid-crystal displays (TFT LCDs). Both combine a high-performance step-up regulator with two linear-regulator controllers, input protection switch control, and flexible sequence programming. The MAX1997 contains two additional linear-regulator controllers and a VCOM buffer. The MAX1997/MAX1998 can operate from input supplies of 2.7V to 5.5V and feature multiple levels of protection circuitry, making them complete power-supply systems for displays.
The main DC-to-DC converter provides the regulated supply voltage for the display's source-driver ICs. The converter is a high-frequency (up to 1.5MHz) step-up regulator with an integrated 14V N-channel MOSFET that allows the use of ultra-small inductors and ceramic capacitors while achieving efficiencies over 85%. Its current-mode control architecture provides fast transient response to pulsed loads. Internal soft-start and cycle-by-cycle current limit help prevent input surge currents.
The positive and negative linear-regulator controllers postregulate charge-pump outputs for TFT gate-on and gate-off supplies. The three outputs can be sequenced in any order by selecting the appropriate external components. Both linear-regulator controllers, as well as the step-up regulator, have supply-sequencing control inputs.
The MAX1997 features a high-current backplane driver (VCOM). This buffer provides peak currents exceeding 300mA (typ) and requires only a 0.47µF output filter capacitor. The MAX1997's two additional linear-regulator controllers can be used to build the gamma reference voltage and a logic supply.
The MAX1997/MAX1998 have a unique input switch control that can replace the typical input supply fuse. When a fault is detected, the regulator is disconnected from the input supply. The fault detector monitors all the regulated output voltages and the current from the input supply. In addition, the MAX1997/MAX1998 enter shutdown when the internal overtemperature threshold is reached.
The MAX1997 is available in a 32-pin thin QFN package and the MAX1998 is available in a 20-pin thin QFN package. Both packages have a maximum thickness of 0.8mm suitable for ultra-thin LCD panels.
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Data Sheet
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An evaluation kit is available: MAX1997EVKIT
Key Features
- 2.7V to 5.5V Input Supply Range
- Adjustable (Up to +13V) Output Voltage for Source-Driver ICs
- Integrated High-Efficiency Power MOSFET
- Linear-Regulator Controllers for TFT Gate-On and Gate-Off Supplies
- High-Current VCOM Buffer (MAX1997 Only)
- Two Additional Linear-Regulator Controllers (MAX1997 Only)
- Programmable Power-Up Sequencing
- Multiple Overload Protection with Thermal Shutdown
- 1µA Shutdown Current
- 32-Pin/20-Pin Thin QFN Packages
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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 |
| MAX1997 |
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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2.7 |
5.5 |
2.7 |
13 |
0.3 |
0.3 |
1500 |
1 |
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26 |
$1.68 @1k |
| MAX1998 |
| Adj. Frequency | | Current Limit | | Internal Pwr. FETs | | Soft Start |
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TFT Bias |
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- |
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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
Pin Configuration
Pin Configuration
Reliability Reports
| Show FIT data for: |
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| Request Reliability Report for: |
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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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| MAX1997ETJ
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Active |
TQFN;32 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0012 (PDF)
Use pkgcode/variation: T3255-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1997ETJ+
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Active |
TQFN;32 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0012 (PDF)
Use pkgcode/variation: T3255+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1997ETJ+T
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Active |
TQFN;32 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0012 (PDF)
Use pkgcode/variation: T3255+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1997ETJ-T
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Active |
TQFN;32 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0012 (PDF)
Use pkgcode/variation: T3255-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1998ETP
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Active |
TQFN;20 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0009 (PDF)
Use pkgcode/variation: T2055-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1998ETP-T
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Active |
QFN;
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.: 19-2638
Rev 0;
2002-11-07
This page last modified: 2009-10-14
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