B5973D datasheet, PDF - EEWORLD Datasheet

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B5973D: DescriptionSwitching Voltage Regulators Power Conversion; CategoryPower/power management The power supply circuit; File Size2MB，44 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/; Environmental Compliance

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B5973D Overview

Switching Voltage Regulators Power Conversion

B5973D Parametric

Parameter Name	Attribute value
Brand Name	STMicroelectronics
Is it Rohs certified?	conform to
Parts packaging code	SOIC
package instruction	HLSOP, SOP8,.25
Contacts	8
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
control mode	VOLTAGE-MODE
Maximum input voltage	36 V
Minimum input voltage	4 V
Nominal input voltage	12 V
JESD-30 code	R-PDSO-G8
length	4.9 mm
Number of functions	1
Number of terminals	8
Maximum operating temperature	125 °C
Minimum operating temperature	-40 °C
Maximum output current	3.5 A
Package body material	PLASTIC/EPOXY
encapsulated code	HLSOP
Encapsulate equivalent code	SOP8,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, HEAT SINK/SLUG, LOW PROFILE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
Maximum seat height	1.7 mm
surface mount	YES
Switch configuration	BUCK
Maximum switching frequency	280 kHz
Temperature level	AUTOMOTIVE
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	3.9 mm
Base Number Matches	1

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B5973D

2 A step down switching regulator for automotive applications

Datasheet

production data



Protection against feedback disconnection



Thermal shutdown

Applications

HSOP8 - exposed pad



Dedicated to automotive applications

Features



Qualified following the AEC-Q100

requirements (temperature Grade 1), see

PPAP for more details.



2 A DC output current



Operating input voltage from 4 V to 36 V



3.3 V / (± 2 %) reference voltage



Output voltage adjustable from 1.235 V to 35 V



Low dropout operation: 100 % duty cycle



250 kHz internally fixed frequency



Voltage feedforward



Zero load current operation



Internal current limiting



Inhibit for zero current consumption



Synchronization

Description

The B5973D is a step down monolithic power

switching regulator with a minimum switch current

limit of 2.25 A so it is able to deliver up to 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 is also

achieved thanks to an HSOP8 package (i.e. SO8

package with exposed frame), that allows to

reduce the R

th(JA)

down to approximately 40

°C/W. The device uses an internal P-channel

DMOS transistor (with a typical R

DSon

of 250 m)

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, it is particularly

suitable for 5 V bus. Pulse by pulse current limit

with the internal frequency modulation offers an

effective constant current short-circuit protection.

Figure 1. Typical application

December 2013

This is information on a product in full production.

DocID14117 Rev 4

1/44

www.st.com

Contents

B5973D

Contents

Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1

1.2

Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1

2.2

Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Datasheet parameters over the temperature range . . . . . . . . . . . . . . . . 8

Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.1

5.2

5.3

5.4

5.5

5.6

5.7

5.8

Power supply and voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Voltages monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Oscillator and synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Current protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Error amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

PWM comparator and power stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Additional features and protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.1

6.2

6.3

Feedback disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Output overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Zero load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Closing the loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

7.1

7.2

7.3

Error amplifier and compensation network . . . . . . . . . . . . . . . . . . . . . . . . 18

LC filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

PWM comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2/44

DocID14117 Rev 4

B5973D Related Products

	B5973D	B5973DTR
Description	Switching Voltage Regulators Power Conversion	Switching Voltage Regulators 2A Step Down REG 2.25A 1.235V to 35V
Brand Name	STMicroelectronics	STMicroelectronics
Is it Rohs certified?	conform to	conform to
package instruction	HLSOP, SOP8,.25	SOP, SOP8,.25
Reach Compliance Code	compliant	compliant
ECCN code	EAR99	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR	SWITCHING REGULATOR
control mode	VOLTAGE-MODE	VOLTAGE-MODE
JESD-30 code	R-PDSO-G8	R-PDSO-G8
Number of terminals	8	8
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	HLSOP	SOP
Encapsulate equivalent code	SOP8,.25	SOP8,.25
Package shape	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE, HEAT SINK/SLUG, LOW PROFILE	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED	225
Certification status	Not Qualified	Not Qualified
surface mount	YES	YES
Maximum switching frequency	280 kHz	280 kHz
Terminal form	GULL WING	GULL WING
Terminal pitch	1.27 mm	1.27 mm
Terminal location	DUAL	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED	NOT SPECIFIED
Base Number Matches	1	1

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