(China (Mainland))
Product Summary
The max1904etj-tg074 is a buck-topology, step-down, switch-mode, power-supply controller that generate logic-supply voltages in battery-powered systems. The max1904etj-tg074 includes on-board power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, low dropout circuitry, internal frequency-compensation networks, and automatic bootstrapping. Applications are (1)Notebook and Subnotebook Computers; (2)PDAs and Mobile Communicators; (3)Desktop CPU Local DC-DC Converters.
Parametrics
max1904etj-tg074 absolute maximum ratings: (1)V+ to GND : -0.3V to +36V; (2)PGND to GND: ±0.3V; (3)VL to GND : -0.3V to +6V; (4)BST3, BST5 to GND : -0.3V to +36V; (5)CSH3, CSH5 to GND: -0.3V to +6V; (6)VDD to GND: -0.3V to +20V; (7)REF Current: +5mA to -1mA; (8)VL Current: +50mA; (9)12OUT Current : +200mA; (10)VDD Shunt Current: +15mA; (11)Continuous Power Dissipation (TA = +70°C)28-Pin SSOP (derate 9.52mW/°C above +70°C): 762mW, 32-Pin Thin QFN (derate 21.3mW/°C above +70°C): 1702mW; (12)Operating Temperature Range : -40°C to +85°C; (13)Storage Temperature Range : -65°C to +160°C; (14)Lead Temperature (soldering, 10s): +300°C.
Features
max1904etj-tg074 features: (1)97% Efficiency; (2)4.2V to 30V Input Range; (3)2.5V to 5.5V Dual Adjustable Outputs; (4)12V Linear Regulator; (5)Adjustable Secondary Feedback; (6)5V/50mA Linear Regulator Output; (7)Precision 2.5V Reference Output; (8)Programmable Power-Up Sequencing; (9)Power-Good (RESET)Output; (10)333kHz/500kHz Low-Noise, Fixed-Frequency Operation; (11)Low-Dropout, 98% Duty-Factor Operation; (12)2.5mW Typical Quiescent Power (12V input, both SMPSs on); (13)4μA Typical Shutdown Current.
Diagrams
