(China (Mainland))
Product Summary
The L5973D is a step down monolithic power switching regulator with a minimum switch current limit of 2.5 A so it is able to deliver more than 2 A DC current to the load depending on the application conditions. The output voltage can be set from 1.235 V to 35 V. The high current level of L5973D is also achieved thanks to an SO8 package with exposed frame, that allows to reduce the Rth(j-amb) down to approximately 40 °C/W. The device uses an internal P-channel D-MOS transistor (with a typical Rdson of 250 mΩ) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 kHz. Having a minimum input voltage of 4 V only, L5973D is particularly suitable for 5 V bus, available in all computer related applications. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection.
Parametrics
L5973D absolute maximum ratings (1)V8 Input voltage: 40 V; (2)V1 Output DC voltage: -1 to 40V , Output peak voltage at t = 0.1 μs: -5 to 40V; (3)I1 Maximum output current: int. limit.; (4)V4, V5 Analog pins: 4 V; (5)V3 INH: -0.3 V to VCC; (6)V2 SYNC: -0.3 to 4 V; (7)PTOT Power dissipation at TA ≤ 60 °C: 2.25 W; (8)TJ Operating junction temperature range: -40 to 150 °C; (9)TSTG Storage temperature range: -55 to 150 °C.
Features
L5973D features: (1)2.5 A internal switch; (2)Operating input voltage from 4 V to 36 V; (3)3.3 V / (±2%)reference voltage; (4)Output voltage adjustable from 1.235 V to 35 V; (5)Low dropout operation: 100 % duty cycle; (6)250 kHz internally fixed frequency; (7)Voltage feedforward; (8)Zero load current operation; (9)Internal current limiting; (10)Inhibit for zero current consumption; (11)Synchronization; (12)Protection against feedback disconnection; (13)Thermal shutdown.
Diagrams
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 L5973D |
STMicroelectronics |
Switching Converters, Regulators & Controllers 1.235 to 35V Step-Dn |
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L5973D013TR |
STMicroelectronics |
Switching Converters, Regulators & Controllers 2.5 A Step-DN Switching Reg |
Data Sheet |
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