Product Information

L4978

L4978 electronic component of STMicroelectronics

Datasheet
Voltage Regulators - Switching Regulators 3.3 to 50V Step-Down
Manufacturer: STMicroelectronics
This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges



Price (USD)

1: USD 2.3952 ea
Line Total: USD 2.4

8 - Global Stock
Ships to you between
Wed. 29 May to Mon. 03 Jun
MOQ: 1  Multiples: 1
Pack Size: 1

 More Buying Options & Price Grid(s)

Availability Price Quantity
1940 - WHS 1


Ships to you between Wed. 22 May to Tue. 28 May

MOQ : 1
Multiples : 1

Stock Image

L4978
STMicroelectronics

1 : USD 3.2552
10 : USD 3.0303
25 : USD 2.9237
100 : USD 2.6689
250 : USD 2.5792
500 : USD 2.5025
1000 : USD 2.4525
2000 : USD 2.4525
4000 : USD 2.4525

8 - WHS 2


Ships to you between
Wed. 29 May to Mon. 03 Jun

MOQ : 1
Multiples : 1

Stock Image

L4978
STMicroelectronics

1 : USD 2.3952
10 : USD 2.1762
50 : USD 2.0381
100 : USD 1.7382
500 : USD 1.673
1200 : USD 1.6455

271 - WHS 3


Ships to you between Wed. 22 May to Tue. 28 May

MOQ : 1
Multiples : 1

Stock Image

L4978
STMicroelectronics

1 : USD 5.577
3 : USD 5.031
5 : USD 3.848
12 : USD 3.64

1940 - WHS 4


Ships to you between Wed. 22 May to Tue. 28 May

MOQ : 4
Multiples : 1

Stock Image

L4978
STMicroelectronics

4 : USD 3.2552
10 : USD 3.0303
25 : USD 2.9237
100 : USD 2.6689
250 : USD 2.5792
500 : USD 2.5025
1000 : USD 2.4525

Read More Specifications

     
Manufacturer
Product Category
Output Current
Input Voltage MAX
Topology
Input Voltage MIN
Switching Frequency
Packaging
Brand
No. Of Outputs
Dc / Dc Converter Ic Case
No. Of Pins
Output Voltage Min
Output Voltage Max
Operating Temperature Max
Svhc
Accuracy
Adjustable Output Voltage Max
Adjustable Output Voltage Min
Base Number
Dropout Voltage Vdo
Frequency
Ic Generic Number
Logic Function Number
Operating Temperature Min
Operating Temperature Range
Primary Input Voltage
Supply Voltage Max
Supply Voltage Min
Termination Type
Voltage Regulator Type
LoadingGif

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Additional Infomation About Product

L4978 2A STEP DOWN SWITCHING REGULATOR 1 Features Figure 1. Packages UP TO 2A STEP DOWN CONVERTER OPERATING INPUT VOLTAGE FROM 8V TO 55V PRECISE 3.3V (1%) INTERNAL DIP-8 SO16W REFERENCE VOLTAGE OUTPUT VOLTAGE ADJUSTABLE FROM Table 1. Order Codes 3.3V TO 50V Part Number Package SWITCHING FREQUENCY ADJUSTABLE UP L4978 DIP-8 TO 300KHz VOLTAGE FEEDFORWARD L4978D SO16 ZERO LOAD CURRENT OPERATION L4978D013TR SO16 in Tape & Reel INTERNAL CURRENT LIMITING (PULSE- BYPULSE AND HICCUP MODE) efficency and high switching speed. INHIBIT FOR ZERO CURRENT CONSUMPTION A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages PROTECTION AGAINST FEEDBACK must be observed). A wide input voltage range be- DISCONNECTION tween 8V to 55V and output voltages regulated THERMAL SHUTDOWN from 3.3V to 50V cover the majority of todays ap- SOFT START FUNCTION plications. Features of this new generations of DC- DC converter include pulse-by-pulse current limit, 2 DESCRIPTION hiccup mode for short circuit protection, voltage The L4978 is a step down monolithic power feedforward regulation, soft-start, protection switching regulator delivering 2A at a voltage be- against feedback loop disconnection, inhibit for tween 3.3V and 50V (selected by a simple external zero current consumption and thermal shutdown. divider). Realized in BCD mixed technology, the The device is available in plastic dual in line, DIP- device uses an internal power D-MOS transistor 8 for standard assembly, and SO16W for SMD as- (with a typical R of 0.25) to obtain very high dson sembly. Figure 2. Typical Application Circuit Vi=8V to 55V 5 8 R 1 20K L4978 3 4 C C C 1 7 2 L1 7 1 6 2 V =3.3V/2A O 220F 220nF 2.7nF 126H 63V (77120) C 6 R D1 2 100nF C 9.1K ST 8 C 5 330F PS3L60U 100nF C 4 22nF D98IN837A Rev. 9 May 2005 1/13L4978 Table 2. Block Diagram VCC 5 THERMAL VOLTAGES SHUTDOWN MONITOR CBOOT CHARGE 2 INTERNAL INTERNAL SS INH INHIBIT SOFTSTART REFERENCE SUPPLY 5.1V 3.3V 7 COMP 6 BOOT 8 E/A FB PWM R Q CBOOT 3.3V S CHARGE AT LIGHT DRIVE LOADS OSCILLATOR 1 3 4 D97IN594 OSC GND OUT Figure 3. Pins Connection (Top view) N.C. 1 16 N.C. GND 2 15 N.C. SS INH 3 14 FB GND 1 8 FB OSC 4 13 COMP SS INH 2 7 COMP OUT 5 12 BOOT OSC 3 6 BOOT OUT 6 11 VCC OUT 4 5 VCC N.C. 7 10 N.C. D97IN595 N.C. 8 9 N.C. D97IN596 DIP-8 SO16W Table 3. Pin Description N Pin Name Function 1 2 GND Ground 2 3 SS INH A logic signal (active low) disables the device (sleep mode operation). A capacitor connected between this pin and ground determines the soft start time. When this pin is grounded disables the device (driven by open collector/drain). 3 4 OSC An external resistor connected between the unregulated input voltage and this pin and a capacitor connected from this pin to ground fix the switching frequency. (Line feed forward is automatically obtained) 2/13

HS Compliance

Tariff Desc

8542.31.00 51 No ..Application Specific (Digital) Integrated Circuits (ASIC)

Electronic integrated circuits: Processors and controllers, whether or not combined with memories, converters, logic circuits, amplifiers, clock and timing circuits, or other circuits
Monolithic integrated circuits:

Stmicroelectronics may also be referenced as

C-Max
C-Max (VA)
SG3
ST
ST MICROELECTRONICS
ST2
ST7
STM
STMICRELECTRONICS
STN

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