|
|
|
MAX8647, MAX8648
Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN
Achieves Industry's Highest Efficiency Using the Industry's First Negative Charge Pump Driving Six White/RGB LEDs Independently
|
Status
Active: In Production.
Description
The MAX8647/MAX8648 drive up to six white LEDs or
two sets of RGB LEDs with regulated constant current
for display backlight and fun light applications. By utilizing
an inverting charge pump and extremely low-dropout
adaptive current regulators, these ICs achieve
very high efficiency over the full 1-cell Li+ battery voltage
range and even with large LED forward voltage
mismatch. The 1MHz fixed-frequency switching allows
for tiny external components. The regulation scheme is
optimized to ensure low EMI and low input ripple. The
MAX8647/MAX8648 include thermal shutdown, open- and
short-circuit protection.
The MAX8647 features an I²C serial port, while the
MAX8648 features a three-wire serial-pulse logic interface.
Both devices support independent on/off and
dimming for main and subbacklights. The dimming
ranges are pseudo-logarithmic from 24mA to 0.1mA
and off in 32 steps. Both devices include a temperature
derating function to safely allow bright 24mA full-scale
output current setting while automatically reducing current
to protect LEDs at high ambient temperatures
above +60°C.
The MAX8647/MAX8648 are available in a 16-pin, 3mm x 3mm thin QFN package (0.8mm max height).
|
|
Data Sheet
|
An evaluation kit is available: MAX8648EVKIT NOTE: This product uses the following:MAX8647 EVKIT Software
Key Features
- Six Adaptive Current Regulators
- Independent Voltage Supply for Each LED
- Individual LED Brightness Control (MAX8647)
- 24mA to 0.1mA Dimming Range
- I²C Interface (MAX8647)
- Serial-Pulse Dimming Logic (MAX8648)
- ±2% Accuracy, ±0.4% Matching (typ)
- Low 70µA Quiescent Current
- Low 1µA Shutdown Current
- Inrush Current Limit
- TA Derating Function Protects LEDs
- 16-Pin, 3mm x 3mm Thin QFN Package
|
|
Applications/Uses
- Camera Flash or RGB Indicators
- Cellular Phones and Smartphones
- PDAs, Digital Cameras, and Camcorders
- White LED Backlighting, Single or Dual Display
- Wide-Gamut RGB LED Display Backlighting
|
|
|
|
Key Specifications:
| White LED Drivers |
| Part Number |
Topology |
LEDs |
Config. |
Dimming Control |
POUT
(W) |
ILED
(mA) |
VIN
(V) |
VIN
(V) |
ICC
(mA) |
VOUT
(V) |
Oper. Freq.
(kHz) |
Package/Pins |
Budgetary Price |
| max num. of |
max |
min |
max |
max |
max |
See Notes |
| MAX8647 |
Charge Pump |
6 |
Parallel |
I2C Serial |
0.6 |
24 |
2.7 |
5.5 |
0.1 |
5 |
1000 |
|
$2.09 @1k |
| MAX8648 |
Serial Pulse |
0.2 |
|
$1.82 @1k |
|
See All White LED Drivers (47)
|
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.
|
|
Diagram
Typical Operating Circuit
Application Notes
Product Guides
Reliability Reports
| Reliability Report: |
MAX8647.pdf |
| Show FIT data for: |
|
| Request Reliability Report for: |
|
Software/Models
Ordering Information
|
Part Number
|
Free
Sample |
Buy |
Status
|
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
|
Temp |
RoHS/Lead-Free?
Materials Analysis
|
| MAX8647ETE+
|
|
|
Active |
TQFN;16 pin;9.6 mm²
Outline Drawing:21-0136 (PDF)
Land Pattern: 90-0032 (PDF)
Use pkgcode/variation: T1633+5*
|
-40°C to +85°C
|
RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX8647ETE+T
|
|
|
Active |
TQFN;16 pin;9.6 mm²
Outline Drawing:21-0136 (PDF)
Land Pattern: 90-0032 (PDF)
Use pkgcode/variation: T1633+5*
|
-40°C to +85°C
|
RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX8648ETE+
|
|
|
Active |
TQFN;16 pin;9.6 mm²
Outline Drawing:21-0136 (PDF)
Land Pattern: 90-0032 (PDF)
Use pkgcode/variation: T1633+5*
|
-40°C to +85°C
|
RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX8648ETE+T
|
|
|
Active |
TQFN;16 pin;9.6 mm²
Outline Drawing:21-0136 (PDF)
Land Pattern: 90-0032 (PDF)
Use pkgcode/variation: T1633+5*
|
-40°C to +85°C
|
RoHS/Lead-Free: Lead Free
Materials Analysis |
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.
|
Similar Products by Function
| MAX1848 |
White LED Step-Up Converter in SOT23 |
| MAX1561, MAX1599 |
High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs |
| MAX1582 |
High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting |
| MAX1573 |
White LED 1x/1.5x Charge Pump in UCSP and Thin QFN |
| MAX1575 |
White LED 1x/1.5x Charge Pump for Main and Sub-Displays |
| MAX1574 |
180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN |
| MAX1576 |
480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash |
| MAX1578, MAX1579 |
Complete Bias and White LED Power Supplies for Small TFT Displays |
| MAX8595X, MAX8596X |
High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs |
|
|
Similar Products by Application
Evaluation Kits
Products with Similar Part Numbers
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-0790
Rev 1;
2007-09-24
This page last modified: 2009-08-19
|
|
|
Download
E-Mail