BD90521MUV-CE2 datasheet, PDF - EEWORLD Datasheet

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BD90521MUV-CE2: Description2.6V TO 5.5V, 2A, 0.3MHZ TO 2.4M; CategoryPower/power management The power supply circuit; File Size3MB，41 Pages; ManufacturerROHM Semiconductor; Websitehttps://www.rohm.com/; Environmental Compliance

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BD90521MUV-CE2 Overview

2.6V TO 5.5V, 2A, 0.3MHZ TO 2.4M

BD90521MUV-CE2 Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	ROHM Semiconductor
Reach Compliance Code	compliant
ECCN code	EAR99
Factory Lead Time	12 weeks
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Maximum time at peak reflow temperature	NOT SPECIFIED

BD90521MUV-CE2 Preview

Datasheet

Secondary power supply series for automotive

2.6V to 5.5V, 2A, 0.3MHz to 2.4MHz

Synchronous Step-Down Converter

BD90521MUV-C / BD90521EFV-C

General Description

The BD90521MUV/EFV -C is a synchronous step-down

converter which operates in current mode. It can operate

with maximum frequency of 2.4 MHz, and can downsize

external parts such as inductor. It can supply a maximum

output current of 2A with built-in Pch and Nch output

MOSFET. Output voltage and oscillation frequency can

be adjusted by external resistors and can also be

synchronized with an external clock.

Key Specifications



Operating Temperature Range(Ta): -40°C to +125°C

Input Voltage Range:

2.6V to 5.5V

Output Current:

2.0A(Max)

Reference Voltage Accuracy:

±1.5 %

Output Voltage Range:

0.6V to 5.0V

Switching Frequency:

0.3MHz to 2.4MHz

Package

W(Typ) x D(Typ) x H(Max)

4.00mm x 4.00mm x 1.00mm

6.50mm x 6.40mm x 1.00mm

Features



AEC-Q100 Qualified

(Note 1)

Up to 2.4MHz movement

Excellent Load Response by Current Mode Control

Built-in Pch/Nch Output MOSFET.

Frequency Synchronization with External Clock.

Output Error Monitor Terminal (PGOOD Terminal)

Adjustable Output Voltage and Oscillation Frequency

by External Resistors.



Built-in Self-Reset Type Overcurrent Protection.



Built-in Output Overvoltage/Short Circuit Detection.



Built-in Temperature Protection (TSD) and UVLO.

(Note 1: Grade 1)

VQFN20SV4040

HTSSOP-B20

VQFN20SV4040

HTSSOP-B20

Applications



Automotive Battery-Powered Supplies

(Cluster Panels, Car Multimedia)



Industrial / Consumer Supplies



Other electronic equipment

Typical Application Circuit

PGND

N.C

PVIN

SYNC

CTL2

PGOOD

SEL

N.C

COMP

CTL1

GND

VIN

〇Product

structure : Silicon monolithic integrated circuit

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〇This

product has no designed protection against radioactive rays

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Contents

General Description ........................................................................................................................................................................ 1

Features.......................................................................................................................................................................................... 1

Applications .................................................................................................................................................................................... 1

Key Specifications .......................................................................................................................................................................... 1

Package

...................................................................................................................................................................

Typical Application Circuit ............................................................................................................................................................... 1

Contents ......................................................................................................................................................................................... 2

Pin Configurations .......................................................................................................................................................................... 3

Pin Descriptions .............................................................................................................................................................................. 3

Block Diagram ................................................................................................................................................................................ 4

Description of Blocks ...................................................................................................................................................................... 4

Absolute Maximum Ratings ............................................................................................................................................................ 6

Thermal Resistance ........................................................................................................................................................................ 6

Recommended Operating Conditions ............................................................................................................................................. 7

Electrical Characteristics................................................................................................................................................................. 8

Typical Performance Curves ........................................................................................................................................................... 9

Description of Operation and Timing Chart ................................................................................................................................... 14

Selection of Components Externally Connected ........................................................................................................................... 17

Recommended Parts Manufacturer List ....................................................................................................................................... 23

Application Examples 1 ................................................................................................................................................................ 24

Application Examples 2 ................................................................................................................................................................ 26

Notes on the PCB Layout ............................................................................................................................................................. 28

Power Dissipation ......................................................................................................................................................................... 31

I/O Equivalent Circuits .................................................................................................................................................................. 32

Operational Notes ......................................................................................................................................................................... 33

Ordering Information ..................................................................................................................................................................... 35

Marking Diagrams ......................................................................................................................................................................... 35

Physical Dimension, Tape and Reel Information ........................................................................................................................... 36

Physical Dimension, Tape and Reel Information ........................................................................................................................... 37

Revision History ............................................................................................................................................................................ 38

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Pin Configurations

(TOP VIEW)

PGOOD

(TOP VIEW)

PGND

SYNC

CTL2

PGND

E-Pad

PGOOD

CTL2

SYNC

SEL

N.C

COMP

GND

N.C

PVIN

SEL

N.C

E-Pad

N.C

PVIN

VIN

CTL1

VQFN20SV4040

COMP

CTL1

GND

VIN

HTSSOP-B20

Pin Descriptions

Pin No.

1 (3)

2 (4)

3 (5)

4 (6)

5 (7)

6 (8)

7 (9)

8 (10)

9 (11)

10 (12)

Symbol

N.C

PVIN

VIN

CTL1

GND

COMP

SW pin

Power supply pin for output FET

Power supply pin

Enable pin

Test pin

GND pin

Error amp output pin

Function

Pin No.

11 (13)

12 (14)

13 (15)

14 (16)

15 (17)

16 (18)

17 (19)

18 (20)

19 (1)

20 (2)

Symbol

N.C

SEL

SYNC

CTL2

PGOOD

PGND

Function

Soft start time setting pin

Output feedback pin

Operating frequency setting pin

RT setting frequency/

Synchronization select pin

External clock input pin

Test pin

Power good output pin

GND pin for output FET

E-Pad is a back radiation pad. Excellent radiation property is obtainable by connection to internal PCB ground-plane using

multiple via.

Use CTL1 terminal by applying 2.1 V or higher when enable is on.

Use CTL2 terminal by short-circuiting to GND.

If N.C pin is shorted to GND, heat radiation performance becomes higher.

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Block Diagram

VIN

COMP

CTL2

VOLTAGE

REFERENCE

0.6V

SOFT

START

UVLO

＋

ERROR

AMPLIFER

PWM

COMPARATOR

PVIN

－

SCP

0.54V

DRV

SLOPE

OCP Vth

OVP

PGND

PGOOD

0.66V

OSCILLATOR

UVLO/TSD

SCP/OVP

GND

SEL

SYNC

CTL1

Description of Blocks

・ERROR

AMPLIFER

This is an error amplifier using reference voltage of 0.6V (Typ) and “FB” terminal voltage as input. (Refer to p. 21 to p. 22

for phase compensation setting method). Duty width of switching pulse is controlled with “COMP” of error amplifier output.

Output voltage is set using “FB” terminal. Phase compensation can be adjusted by connecting capacitor and resistor to

“COMP” terminal.

・SOFT

START

This is a function for preventing overshoot of output voltage by gradually raising non-inverting input voltage of ERROR

AMPLIFIER to gradually increase duty of switching pulse at power on. Soft start can be set by connecting a capacitor

between “GND” terminals with “SS terminal”. (Refer to p. 22.)

・OSCILLATOR

Oscillation frequency of 0.3 MHz to 2.4 MHz can be set by connecting a resistor between “RT” terminal and “GND”

terminal in the circuit which generates pulse waveform to be input to SLOPE. (Refer to Figure 18 on p. 21)OSCILLATOR

output sends clock signal to DRV. OSCILLATOR output is also used as the clock of SCP counter.

・SLOPE

This is the block for generating saw-tooth wave from the clock formed by OSCILLATOR. Generated saw-tooth wave is

combined with feedback current of coil current and sent to PWM COMPARATOR.

・PWM

COMPARATOR

This is a comparator that compares SLOPE output and ERROR AMPLIFIER output.

・DRV

This is a latch circuit having OSCILLATOR output (set) and PWM COMPARATOR output (reset) as input. It generates

PWM control signal and outputs gate signal for FET drive.

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・TSD

(Thermal Shut Down)

This is an overheat protection circuit. In order to prevent IC thermal destruction/runaway, output is turned off when chip

temperature rises to about 150°C or higher. It is recovered when temperature returns to constant temperature. However,

since overheat protection circuit is essentially built-in for the purpose of protection of IC itself, carry out thermal design to

keep chip temperature below about 150°C as TSD detection temperature.

・OCP

(Over Current Protection)

This is an overcurrent protection circuit. When output Pch POWER MOS FET is turned on and voltage between drain and

source exceeds internal reference voltage value, overcurrent protection activates. This overcurrent protection is self-reset

type. When overcurrent protection activates, duty becomes small and output voltage is reduced. However, since these

protection circuits are effective in protection from destruction due to sudden accidents, avoid using them when continuous

protection circuit is in action.

・SCP

(Short Current Protection)

This is a load short-circuit protection circuit. When the state of output of 60% or lower is detected in oscillation cycle × 256

(s), POWER MOS FET is turned off. If output voltage is recovered to 60% or higher before completion of 256 cycles,

POWER MOS FET is not turned off. This load short-circuit protection is cancelled after retention of oscillation cycle × 2048

(s), and it is restarted with soft start. Elongation of off time results in decrease of mean output current. During startup of

power source, this function is masked until output reaches set voltage to prevent startup failure.

・UVLO

(Under Voltage Lock-Out)

This is a low voltage wrong operation prevention circuit. It prevents wrong operation of internal circuits during power

source voltage startup and when power source voltage is reduced. Power source voltage is monitored and when it is

reduced to 2.25 V (Typ) or lower, output POWER MOS FET is turned off. When UVLO is cancelled, it is restarted with soft

start. This threshold has hysteresis of 100 mV (Typ).

・VOLTAGE

REFERENCE

It supplies reference voltage to internal circuits.

・OVP

When output voltage is detected to have exceeded set value + 10%, Pch FET and Nch FET of output is turned off. After

detection, when output is reduced and the overvoltage state is cancelled, switching action is restarted. There is hysteresis

of 2% in overvoltage detection voltage and cancel voltage.

・PGOOD

When output voltage is below 90% or above 110% of set value, output error state is assumed, and PGOOD terminal is

turned “Low”. There is hysteresis of 2% in detection voltage and cancel voltage. At the time of EN OFF and when UVLO

and TSD are in action, PGOOD terminal output is also turned “Low”. If VIN input voltage exceeds 2 V, PGOOD output

becomes effective. Since output is open drain type, connect pull up to VIN or an external power source with resistance of

10kΩ - 100 kΩ.

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BD90521MUV-CE2 Related Products

	BD90521MUV-CE2	BD90521EFV-CE2
Description	2.6V TO 5.5V, 2A, 0.3MHZ TO 2.4M	IC REG BUCK ADJ 2A SYNC 20HTSSOP
Is it Rohs certified?	conform to	conform to
Maker	ROHM Semiconductor	ROHM Semiconductor
Reach Compliance Code	compliant	compliant
ECCN code	EAR99	EAR99
Factory Lead Time	12 weeks	12 weeks
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR	SWITCHING REGULATOR
Peak Reflow Temperature (Celsius)	NOT SPECIFIED	NOT SPECIFIED
Maximum time at peak reflow temperature	NOT SPECIFIED	NOT SPECIFIED

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