MAX1574ETB-T Maxim Integrated Products, MAX1574ETB-T Datasheet

no-image

MAX1574ETB-T

Manufacturer Part Number
MAX1574ETB-T
Description
LED Drivers High Efficiency 180m A, 1x-2x, White LED
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1574ETB-T

Number Of Segments
3
Low Level Output Current
60000 uA (Typ)
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Supply Current
2 uA (Typ)
Maximum Power Dissipation
1454 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
TDFN EP
Minimum Operating Temperature
- 40 C
The MAX1574 charge pump drives up to three white
LEDs with regulated constant current for uniform intensity.
By utilizing adaptive 1x/2x charge-pump modes and
very-low-dropout current regulators, it achieves 180mA
output drive capability and high efficiency over the 1-cell
lithium-battery input voltage range. Fixed-frequency
(1MHz) switching allows for tiny external components,
and the regulation scheme is optimized to ensure low EMI
and low input ripple.
The MAX1574 uses an external resistor to set the full-
scale 100% LED current. An enable input (EN) is used for
simple on/off control or can be pulsed repeatedly to set
lower LED current in multiple steps down to 5%. Once the
desired brightness is set, the MAX1574 maintains con-
stant LED current as long as EN is kept high. If EN is kept
low for more than 2ms, the MAX1574 enters shutdown.
The MAX1574 is available in a 10-pin 3mm x 3mm TDFN
package (0.8mm max height).
19-3117; Rev 0; 12/03
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.
LCD Backlighting
Camera Strobes/Flashes and Movie Lights
Cell Phones/Smart Phones
PDAs, Digital Cameras, and Camcorders
ON/OFF AND
DIMMING
1µF
2.7V TO 5.5V
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
180mA, 1x/2x, White LED Charge Pump
IN
GND
EN
SET
General Description
CP
MAX1574
0.22µF
CN
LED1
LED2
LED3
OUT
Applications
UP TO 180mA
1µF
MAX1574ETB
TOP VIEW
Up to 180mA (60mA/LED) Drive Capability
83% Average Efficiency (P
Battery Discharge
0.5% (typ) LED Current Matching
Adaptive 1x/2x Mode Switchover
Low Input Ripple and EMI
5% to 100% Dimming Through Single-Wire Serial
Pulse Interface
Low 0.1µA Shutdown Current
2.7V to 5.5V Supply Voltage Range
Soft-Start Limits Inrush Current
Output Overvoltage Protection
Thermal-Shutdown Protection
10-Pin 3mm x 3mm TDFN Package
PART
in 3mm x 3mm TDFN
10
-40°C to +85°C
TEMP RANGE
1
3mm × 3mm
Ordering Information
9
2
MAX1574
TDFN
8
3
Pin Configuration
LED
7
4 4
PIN-
PACKAGE
10 TDFN
3mm x 3mm
/ P
6
5
BATT
Features
) Over Li+
MARK
TOP
ABB
1

Related parts for MAX1574ETB-T

MAX1574ETB-T Summary of contents

Page 1

... Dimming Through Single-Wire Serial Pulse Interface Low 0.1µA Shutdown Current 2.7V to 5.5V Supply Voltage Range Soft-Start Limits Inrush Current Output Overvoltage Protection Thermal-Shutdown Protection 10-Pin 3mm x 3mm TDFN Package Applications PART MAX1574ETB TOP VIEW UP TO 180mA 1µF Features / P ) Over Li+ LED BATT Ordering Information ...

Page 2

White LED Charge Pump in 3mm x 3mm TDFN ABSOLUTE MAXIMUM RATINGS IN, OUT GND..............................................-0.3V to +6.0V SET, LED1, LED2, LED3 GND .........-0. 0.3V GND ......................................................................-0.3V to the ...

Page 3

White LED Charge Pump ELECTRICAL CHARACTERISTICS (continued 3. GND SET (Note 1) PARAMETER EN Input Current EN Low Shutdown Delay EN t (Figure (Figure ...

Page 4

White LED Charge Pump in 3mm x 3mm TDFN (Circuit of Figure 3.6V IN, driving three white LEDs LED CURRENT MATCHING vs. INPUT SUPPLY VOLTAGE 1.0 0.8 0.6 0.4 0.2 0 ...

Page 5

White LED Charge Pump (Circuit of Figure 3.6V IN, driving three white LEDs DIMMING RESPONSE OUT V OUT PIN NAME Supply Voltage Input. Connect a 0.47µF to 1µF ...

Page 6

White LED Charge Pump in 3mm x 3mm TDFN Detailed Description The MAX1574 charge pump drives up to three white LEDs with regulated constant current for uniform inten- sity. By utilizing adaptive 1x/2x charge-pump modes and very-low-dropout current ...

Page 7

White LED Charge Pump Table 1. Recommended Components COMPONENT VALUE MANUFACTURER DESIGNATION 1µF IN OUT 0.22µF C1 0.47µF D1, D2, D3 — Required SET Applications Information Driving Fewer than Three LEDs When driving ...

Page 8

White LED Charge Pump in 3mm x 3mm TDFN 2. 1µF CONTROL AND EN DIMMING REFERENCE CONTROL AND ENABLE ON OFF CONTROLLED-CURRENT ERROR AMP2 SET R SET MAX1574 Figure 2. Functional Diagram and ...

Page 9

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2003 Maxim Integrated Products ...

Related keywords