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L4976


Part Number L4976
Manufacturer STMicroelectronics
Title 1A STEP DOWN SWITCHING REGULATOR
Description The L4976 is a step down monolithic power switching regulator delivering 1A at a voltage between 3.3V and 50V (selected by a simple external divid...
Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, protection against feedback loop disconnection and thermal shutdown. The device is available in plastic dual in line, MINIDIP 8 for standard asse...

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L4971 : The L4971 is a step down monolithic power switching regulator delivering 1.5A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25Ω) to obtain very high efficency and high switching speed. TYPICAL APPLICATION CIRCUIT Vi=8V to 55V 5 R1 20K 3 C1 220µF 63V C7 220nF C2 2.7nF 2 7 Minidip SO16W ORDERING NUMBERS: L4971 (Minidip) L4971D (SO16) A switching frequency up to 500KHz is achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majo.

L4972A : The L4972A is a stepdown monolithic power switching regulator delivering 2A at a voltage variable from 5.1 to 40V. Realized with BCD mixed technology, the device Figure 2. Block Diagram Figure 1. Packages PowerDIP20 (16+2+2) Table 1. Order Codes Part Number L4972A L4972AD L4972AD013TR SO20 Package DIP20 (16+2+20) SO20 SO20 in Tape & Reel uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of the L4972 include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a Powerdip 16 + 2 + 2 and SO20 large plastic packages and requires few external comp.

L4972AD : The L4972A is a stepdown monolithic power switching regulator delivering 2A at a voltage variable from 5.1 to 40V. Realized with BCD mixed technology, the device Figure 2. Block Diagram Figure 1. Packages PowerDIP20 (16+2+2) Table 1. Order Codes Part Number L4972A L4972AD L4972AD013TR SO20 Package DIP20 (16+2+20) SO20 SO20 in Tape & Reel uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of the L4972 include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a Powerdip 16 + 2 + 2 and SO20 large plastic packages and requires few external comp.

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L4973D3.3 : The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V. Realized in BCD mixed technology, the device VCC (8V to 55V) ROSC CIN C2 7 8 10 12 CBOOT VO(3.3V or 5.1V) L1 1 4,5,6, 13,14,15 16 L4973 17 9 3 11 2 RCOMP COSC CSS CCOMP D1 COUT D97IN554A April 2000 1/16 L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 uses an internal power D-MOS transistor (with a typical Rdson of 0.15ohm) to obtain very high efficiency and very fast switching times. Switching frequency up to 300KHz are achievable (the maximum power dissipation of the packages must be observed). .

L4973D5.1 : The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V. Realized in BCD mixed technology, the device VCC (8V to 55V) ROSC CIN C2 7 8 10 12 CBOOT VO(3.3V or 5.1V) L1 1 4,5,6, 13,14,15 16 L4973 17 9 3 11 2 RCOMP COSC CSS CCOMP D1 COUT D97IN554A April 2000 1/16 L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 uses an internal power D-MOS transistor (with a typical Rdson of 0.15ohm) to obtain very high efficiency and very fast switching times. Switching frequency up to 300KHz are achievable (the maximum power dissipation of the packages must be observed). .

L4973V3.3 : The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V. Realized in BCD mixed technology, the device VCC (8V to 55V) ROSC CIN C2 7 8 10 12 CBOOT VO(3.3V or 5.1V) L1 1 4,5,6, 13,14,15 16 L4973 17 9 3 11 2 RCOMP COSC CSS CCOMP D1 COUT D97IN554A April 2000 1/16 L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 uses an internal power D-MOS transistor (with a typical Rdson of 0.15ohm) to obtain very high efficiency and very fast switching times. Switching frequency up to 300KHz are achievable (the maximum power dissipation of the packages must be observed). .

L4973V5.1 : The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V. Realized in BCD mixed technology, the device VCC (8V to 55V) ROSC CIN C2 7 8 10 12 CBOOT VO(3.3V or 5.1V) L1 1 4,5,6, 13,14,15 16 L4973 17 9 3 11 2 RCOMP COSC CSS CCOMP D1 COUT D97IN554A April 2000 1/16 L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1 uses an internal power D-MOS transistor (with a typical Rdson of 0.15ohm) to obtain very high efficiency and very fast switching times. Switching frequency up to 300KHz are achievable (the maximum power dissipation of the packages must be observed). .

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L4977A : The L4977A is a stepdown monolithic power switching regulator delivering 7A at a voltage variable from 5.1 to 40V. BLOCK DIAGRAM MULTIPOWER BCD TECHNOLOGY Multiwatt15V ORDERING NUMBER: L4977A Realized with BCD mixed technology, the device uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of the L4977A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a 15-lead multiwatt plastic power package and requires few external components. Efficient operation at switching frequencies up to 500KHz allows reduction in the size and cost of extern.

L4978 : The L4978 is a step down monolithic power switching regulator delivering 2A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25Ω) to obtain very high efficency and high switching speed. TYPICAL APPLICATION CIRCUIT Vi=8V to 55V 5 R1 20K 3 C1 220µF 63V C7 220nF C2 2.7nF 2 7 Minidip SO16W ORDERING NUMBERS: L4978 (Minidip) L4978D (SO16) A switching frequency up to 500KHz is achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majori.

L4979D : L4979D and L4979MD are low dropout linear regulators with microprocessor control functions such as low voltage reset, watchdog, on/off control. Typical quiescent current is 100 µA in Datasheet - production data very low output current mode and enabled regulator. The devices drop to 6 µA with not enabled regulators. On chip trimming results in high output voltage accuracy (+/-2%). Accuracy is kept over wide temperature range, line and load variation. The maximum input voltage is 40 V. The max output current is internally limited. Internal temperature protection disables the voltage regulator output. Table 1. Device summary Package Order codes Tube Tape and reel SO-8 SO-20 L4979D L4979.

L4979MD : L4979D and L4979MD are low dropout linear regulators with microprocessor control functions such as low voltage reset, watchdog, on/off control. Typical quiescent current is 100 µA in Datasheet - production data very low output current mode and enabled regulator. The devices drop to 6 µA with not enabled regulators. On chip trimming results in high output voltage accuracy (+/-2%). Accuracy is kept over wide temperature range, line and load variation. The maximum input voltage is 40 V. The max output current is internally limited. Internal temperature protection disables the voltage regulator output. Table 1. Device summary Package Order codes Tube Tape and reel SO-8 SO-20 L4979D L4979.




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