BD90521EFV-C Datasheet PDF - ROHM Semiconductor
| Part Number | BD90521EFV-C | |
| Description | Synchronous Step-Down Converter | |
| Manufacturers | ROHM Semiconductor | |
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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.
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)
Applications
Automotive Battery-Powered Supplies
(Cluster Panels, Car Multimedia)
Industrial / Consumer Supplies
Other electronic equipment
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)
VQFP20SV4040 4.00mm x 4.00mm x 1.00mm
HTSSOP-B20
6.50mm x 6.40mm x 1.00mm
VQFN20SV4040
HTSSOP-B20
Typical Application Circuit
〇Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
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〇This product has no designed protection against radioactive rays
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BD90521MUV-C / BD90521EFV-C
Datasheet
・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 VTH(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.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
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TSZ02201-0J3J0AL01130-1-2
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| Information | Total 30 Pages | |
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