MAX8630W/MAX8630X 19-0825 Rev 0 5/07 125mA 1x/1.5x Charge Pumps for 5 White LEDs in 3mm x 3mm TDFN General Description Features The MAX8630W/MAX8630X charge pumps drive up to 5 93% Max/85% Avg. Efficiency (P /P ) Over LED BATT white LEDs with regulated constant current up to 125mA Li+ Battery Discharge total. By utilizing adaptive 1x/1.5x charge-pump modes 1% LED Current Accuracy and very low-dropout current regulators, they achieve 125mA Total Drive Capability high efficiency over the full 1-cell Li+ battery input volt- Adaptive 1x/1.5x Mode Switchover age range. The 1MHz fixed-frequency switching allows Single-Wire, Serial-Pulse Dimming (MAX8630X) for tiny external components, and the regulation scheme Independent On/Off/Dimming for Main and Sub is optimized to ensure low EMI and low input ripple. An LinearFull, 31/32nd, 30/32nd, 1/32nd integrated derating function protects the LEDs from overheating during high ambient temperatures. Direct-PWM Dimming (MAX8630W) The MAX8630W/MAX8630X are factory trimmed for full- 15, 18, 20, and 25mA Full-Scale Versions scale LED current options of 15mA, 18mA, 20mA, and Low 0.1A Shutdown Current 25mA. The MAX8630X uses two enable inputs (ENM for Soft-Start Eliminates Inrush Current 3 main LEDs and ENS for 2 sub LEDs) for simple on/off Output Overvoltage Protection control and single-wire, serial-pulse dimming in 32 linear Thermal-Derating Function Protects LEDs steps. The MAX8630W uses a single direct PWM input (PWM) to control all 5 LEDs with DC current proportional 14-Pin, 3mm x 3mm TDFN Package to the PWM duty cycle. If both ENM and ENS (or PWM) are kept low for more than 4ms, the MAX8630 enters Ordering Information shutdown. The MAX8630W/MAX8630X are available in a PIN- TOP PKG 14-pin, 3mm x 3mm TDFN package (0.8mm max height). PART PACKAGE MARK CODE Applications 14 TDFN-14 MAX8630WETD15+T ADQ T1433-2 (3mm x 3mm) Display Backlight (Up to 5 LEDs) Note: All devices are specified to operate over the -40C to Main (3 LEDs) + Sub (2 LEDs) Displays +85C operating temperature range. Cell Phones and Smartphones +Denotes a lead-free package. T = Tape and reel. PDAs, Digital Cameras, and Camcorders Ordering Information continued at end of data sheet. Selector Guide appears at end of data sheet. Pin Configuration Typical Operating Circuit TOP VIEW 1F INPUT C1P C1N 2.7V TO 5.5V OUTPUT 14 13 12 11 10 9 8 OUT IN 1F 1F GND MAX8630X MAIN LED1 MAX8630W LED2 ENABLE MAIN MAX8630X ON/OFF AND ENM LED3 DIMMING SUB LED4 ENABLE SUB ON/OFF AND ENS LED5 1234567 C2P C2N DIMMING TDFN 1F 3mm 3mm ( ) ARE FOR MAX8630W Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE LED1 GND C1N LED2 LED3 IN C2N LED4 C2P LED5 C1P ENM (CPWM) OUT ENS (PWM)125mA 1x/1.5x Charge Pumps for 5 White LEDs in 3mm x 3mm TDFN ABSOLUTE MAXIMUM RATINGS IN, OUT to GND.....................................................-0.3V to +6.0V Continuous Power Dissipation (T = +70C) A C1N, C2N, ENM, CPWM, ENS, 14-Pin TDFN 3mm x 3mm PWM to GND ............................................-0.3V to (V + 0.3V) (derate 18.2mW/C above +70C).............................1454mW IN LED to GND ............................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C OUT C1P, C2P to GND ...-0.3V to greater of (V + 1V) or (V + 1V) Storage Temperature Range .............................-65C to +150C OUT IN OUT Short Circuit to GND ..........................................Continuous Lead Temperature (soldering, 10s) .................................+300C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 3.6V, V = 0V, EN (PWM) = IN, T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) IN GND A A PARAMETER CONDITIONS MIN TYP MAX UNITS IN Operating Voltage 2.7 5.5 V Undervoltage-Lockout Threshold V rising or falling 2.20 2.45 2.65 V IN Undervoltage-Lockout Hysteresis 100 mV Output Overvoltage Protection V rising, any LED = GND 5 V OUT Threshold 1/32nd setting, 1.5x mode 1.4 No-Load Supply Current mA 1/32nd setting, 1x mode 0.35 T = +25C 0.01 2 A Shutdown Supply Current ENM = ENS (PWM) = GND A T = +85C 0.1 A Soft-Start Time (t ) 2ms SOFT-START MAX8630 ETD15 15 MAX8630 ETD18 18 Full-Scale LED Current mA MAX8630 ETD20 20 MAX8630 ETD25 25 T = +25C -1 0.3 +1 A Full-Scale LED Current Accuracy % T = -40C to derating function start temperature -3.5 0.3 +3.5 A Derating Function Start 40 C Temperature Derating Function Slope T = +40C to +85C -1.67 %/C A LED Dropout Voltage 100% LED setting (Note 2) 40 75 mV 1x to 1.5x Mode Transition V falling 88 mV LED Threshold Input Voltage Mode Transition 70 mV Hysteresis 1.5x Mode Regulation Voltage Minimum of V 122 mV LED OUT Pulldown Resistance in ENM = ENS (PWM) = GND 5 k Shutdown 2 MAX8630W/MAX8630X