MAX8630Z

` 93% Max/85% Avg. Efficiency (P<sub>LED</sub>/P<sub>BATT</sub>) Over Li+ Battery Discharge
` 1% LED Current Accuracy
` 125mA Total Drive Capability
` Adaptive 1x/1.5x Mode Switchover
` Single-Wire, Serial-Pulse Dimming (MAX8630Z) Independent On/Off/Dimming for Main and Sub Linear-Full, 31/32nd, 30/32nd, . 1/32nd
` Direct-PWM Dimming (MAX8630Y)
` 15, 18, 20, and 25mA Full-Scale Versions
` Low 0.1A Shutdown Current
` Soft-Start Eliminates Inrush Current
` Output Overvoltage Protection
` Thermal-Derating Function Protects LEDs
` 14-Pin, 3mm x 3mm TDFN Package

IN, OUT to GND.....................................................-0.3V to +6.0V
C1N, C2N, ENM, CPWM, ENS,
   PWM to GND ............................................-0.3V to (VIN + 0.3V)
LED_ to GND ............................................-0.3V to (VOUT + 0.3V)
C1P, C2P to GND ...-0.3V to greater of (VOUT + 1V) or (VIN + 1V)
OUT Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T_A = +70°C)
   14-Pin TDFN 3mm x 3mm
   (derate 18.2mW/°C above +70°C)...........................1454mW
Junction Temperature......................................................+150°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C

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.

The MAX8630Y/MAX8630Z charge pumps drive up to 5 white LEDs with regulated constant current up to 125mA total. By utilizing adaptive 1x/1.5x charge-pump modes and very low-dropout current regulators, they achieve high efficiency over the full 1-cell Li+ battery input voltage range. The 1MHz fixed-frequency switching of MAX8630Z allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple. An integrated derating function of MAX8630Z protects the LEDs from overheating during high ambient temperatures.

The MAX8630Y/MAX8630Z are factory trimmed for fullscale LED current options of 15mA, 18mA, 20mA, and 25mA. The MAX8630Z uses two enable inputs (ENM for 3 main LEDs and ENS for 2 sub LEDs) for simple on/off control and single-wire, serial-pulse dimming in 32 linear steps. The MAX8630Y uses a single direct PWM input (PWM) to control all 5 LEDs with DC current proportional to the PWM duty cycle. If both ENM and ENS (or PWM) are kept low for more than 2ms, the MAX8630_ enters shutdown. The MAX8630Y/MAX8630Z are available in a 14-pin, 3mm x 3mm TDFN package (0.8mm max height).