Datasheet MAX1573 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | White LED 1x/1.5x Charge Pump in UCSP and Thin QFN |
| Seiten / Seite | 9 / 1 — White LED 1x/1.5x Charge Pump in. UCSP and Thin QFN. MAX1573. General … |
| Dateiformat / Größe | PDF / 269 Kb |
| Dokumentensprache | Englisch |
White LED 1x/1.5x Charge Pump in. UCSP and Thin QFN. MAX1573. General Description. Features. Proprietary Adaptive 1x/1.5x Modes
Modelllinie für dieses Datenblatt
Textversion des Dokuments
19-2847; Rev 2; 8/05
White LED 1x/1.5x Charge Pump in UCSP and Thin QFN MAX1573 General Description Features
The MAX1573 fractional charge pump drives up to four ♦
Proprietary Adaptive 1x/1.5x Modes
white LEDs with regulated constant current for uniform ♦
High Efficiency (PLEDs/PBATT), Up to 92%
intensity. By utilizing proprietary adaptive 1x/1.5x modes and ultra-low-dropout current regulators, it ♦
0.2% LED Current Matching
maintains the highest possible efficiency over the full ♦
28mA/LED Drive Capability
1-cell Li+ battery input voltage range. The 1MHz fixed- ♦ frequency switching allows for tiny external compo-
Low Input Ripple and EMI
nents and the regulation scheme is optimized to ensure ♦
Eliminates Ballast Resistors
low EMI and low input ripple. ♦
Logic or PWM Dimming Control
An external resistor sets the full-scale LED current, while ♦
Low 0.1µA Shutdown Current
two digital inputs control on/off and select amongst three levels of brightness. A pulse-width modulation (PWM) ♦
2.7V to 5.5V Input Voltage Range
signal can also be used to modulate LED brightness, ♦
Soft-Start Limits Inrush Current
requiring no additional components. ♦
Output Overvoltage Protection
The MAX1573 is available in the tiny chip-scale UCSP™ (4 x 4 grid) and 16-pin thin QFN packages. ♦
Thermal Shutdown Protection
♦
No External Schottky Diode Required
♦
Tiny UCSP (2.1mm x 2.1mm x 0.6mm) and Thin QFN (4mm x 4mm) Packages Applications
Cell Phones, Smart Phones
Ordering Information
PDAs, Digital Cameras, Camcorders
PART TEMP RANGE PIN-PACKAGE
MP3 Players MAX1573EBE-T -40°C to +85°C 14 UCSP (4 x 4) Other Handhelds with Color Displays MAX1573ETE -40°C to +85°C 16 Thin QFN MAX1573ETE+ -40°C to +85°C 16 Thin QFN + Denotes lead-free package.
Typical Operating Circuit Pin Configurations
TOP VIEW 1μF 1μF N.C. GND LED3 LED4 12 11 10 9 C1N C1P C2N C2P VOUT V CIN IN 13 8 LED1 UP TO 4 LEDS 2.7V TO 5.5V IN OUT 1μF 1μF IN 14 7 LED2 MAX1573 ON/OFF MAX1573 C2N 15 6 SET AND EN1 LED1 DIMMING EN2 LED2 CONTROL C1P 16 5 EN2 LED3 1 2 3 4 SET LED4 GND C2P OUT EN1 N.C. RSET
THIN QFN 4mm
×
4mm
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES. Pin Configurations continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
White LED 1x/1.5x Charge Pump in UCSP and Thin QFN MAX1573 General Description Features
The MAX1573 fractional charge pump drives up to four ♦
Proprietary Adaptive 1x/1.5x Modes
white LEDs with regulated constant current for uniform ♦
High Efficiency (PLEDs/PBATT), Up to 92%
intensity. By utilizing proprietary adaptive 1x/1.5x modes and ultra-low-dropout current regulators, it ♦
0.2% LED Current Matching
maintains the highest possible efficiency over the full ♦
28mA/LED Drive Capability
1-cell Li+ battery input voltage range. The 1MHz fixed- ♦ frequency switching allows for tiny external compo-
Low Input Ripple and EMI
nents and the regulation scheme is optimized to ensure ♦
Eliminates Ballast Resistors
low EMI and low input ripple. ♦
Logic or PWM Dimming Control
An external resistor sets the full-scale LED current, while ♦
Low 0.1µA Shutdown Current
two digital inputs control on/off and select amongst three levels of brightness. A pulse-width modulation (PWM) ♦
2.7V to 5.5V Input Voltage Range
signal can also be used to modulate LED brightness, ♦
Soft-Start Limits Inrush Current
requiring no additional components. ♦
Output Overvoltage Protection
The MAX1573 is available in the tiny chip-scale UCSP™ (4 x 4 grid) and 16-pin thin QFN packages. ♦
Thermal Shutdown Protection
♦
No External Schottky Diode Required
♦
Tiny UCSP (2.1mm x 2.1mm x 0.6mm) and Thin QFN (4mm x 4mm) Packages Applications
Cell Phones, Smart Phones
Ordering Information
PDAs, Digital Cameras, Camcorders
PART TEMP RANGE PIN-PACKAGE
MP3 Players MAX1573EBE-T -40°C to +85°C 14 UCSP (4 x 4) Other Handhelds with Color Displays MAX1573ETE -40°C to +85°C 16 Thin QFN MAX1573ETE+ -40°C to +85°C 16 Thin QFN + Denotes lead-free package.
Typical Operating Circuit Pin Configurations
TOP VIEW 1μF 1μF N.C. GND LED3 LED4 12 11 10 9 C1N C1P C2N C2P VOUT V CIN IN 13 8 LED1 UP TO 4 LEDS 2.7V TO 5.5V IN OUT 1μF 1μF IN 14 7 LED2 MAX1573 ON/OFF MAX1573 C2N 15 6 SET AND EN1 LED1 DIMMING EN2 LED2 CONTROL C1P 16 5 EN2 LED3 1 2 3 4 SET LED4 GND C2P OUT EN1 N.C. RSET
THIN QFN 4mm
×
4mm
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES. Pin Configurations continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.