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PDF BD3021HFP-M Data sheet ( Hoja de datos )
| Número de pieza | BD3021HFP-M | |
| Descripción | 500mA Output LDO Regulators | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
LDO Regulators with Watch-Dog Timer
500mA Output LDO Regulators
with Voltage Detector and Watchdog Timer
BD3020HFP-M BD3021HFP-M
General Description
BD3020HFP-M BD3021HFP-M is a regulator IC with
integrated WDT (Watch Dog Timer), high output voltage
accuracy ±2.0 % and 80 µA (Typ) low circuit current
consumption. These are supports usage of low ESR ceramic
capacitor for output stability. The reset detection voltage can
be adjusted by connecting resistors on the Vs terminal
(BD3020HFP-M). They can be a stable power supply for any
applications while detecting malfunction of microcontrollers.
Features
Integrated WDT Reset Circuit
[BD3020HFP-M]: Adjustable Detection Voltage
through Vs pin
[BD3021HFP-M]: WDT Can be Switched ON / OFF
by Using INH Pin
Low saturation voltage by using PMOS output transistor
VCC Max Voltage: 50 V
Integrated Over Current Protection and
Thermal Shut Down
HRP7 package
Key specification
Low Circuit Current:
Output Voltage:
Output Current:
High Output Voltage Accuracy:
Low ESR ceramic capacitor
can be used as output capacitor
80 μA (Typ)
5.0 V (Typ)
500 mA
±2 %
Package
W (Typ) × D (Typ) × H (Max)
HRP7 9.395 mm × 10.540 mm × 2.005 mm
Figure 1. Package Outlook
Applications
Automotive (body, audio system, navigation system, etc.)
Typical Application Circuits
BD3020HFP-M
BD3021HFP-M
Figure 2. Typical Application Circuits
○Product structure：Silicon monolithic integrated circuit
w. ww.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
1/24
TSZ02201-0G1G0AN00010-1-2
20.Apr.2015 Rev.002
1 page  
BD3020HFP-M BD3021HFP-M
Datasheet
Electrical Characteristics (Unless otherwise specified, -40°C, ≤ Ta ≤ +125 °C, VCC = 13.5 V, VCLK = GND)
Parameter
Limit
Symbol
Unit
Min Typ Max
Conditions
Watchdog timer
CT Switching Threshold Voltage High
VthH
1.08 1.15 1.25
V WDT ON(1), INH = open(1)
CT Switching Threshold Voltage Low
VthL
0.13 0.15 0.17
V WDT ON(1), INH = open(1)
WDT Charge Current
WDT Discharge Current
Ictc
3.5
6.0
8.5
μA
WDT ON(1), INH = open(1)
VCT = 0 V
Ictd
1.2
2.0
2.8
μA
WDT ON(1), INH = open(1)
VCT = 1.3 V
Watchdog Monitor Time Low
tWH
3.0
5.0
7.0
ms
WDT ON(1), INH = open(1),
CCT = 0.01 μF (Ceramic Capacitor) (2)
Watchdog Reset Time
CLK Input Pulse Width
INH*
WDT OFF Threshold Voltage
tWL
tWCLK
VHINH
WDT ON Threshold Voltage
VLINH
INH Input current
IINH
(1) BD3021HFP-M only
(2) Characteristics of ceramic capacitor not considered.
1.0 1.7 2.4 ms
500 -
- ns
VOUT
× 0.8
-
VOUT
V
0
-
VOUT
× 0.3
V
INH is pulled down inside the IC
when INH open.
- 10 20 μA VINH = 5 V
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/24
TSZ02201-0G1G0AN00010-1-2
20.Apr.2015 Rev.002
5 Page 
BD3020HFP-M BD3021HFP-M
BD3020HFP-M Detection Voltage Adjustment (Resistance value is typical value)
VOUT
VOUT
R4
Vs
R2 = 900 kΩ
10 kΩ
R3 R1 = 330 kΩ Vs ≈ 1.23 V
VOUT
470 kΩ
RESET
1 kΩ
Datasheet
IC Internal Block Diagram
When typical detection voltage is 4.1 V
Vdet ≈ Vs × (R1 + R2) / R1
・Vdet : Reset detection voltage
・Vs
: Internal reference voltage (MOS input)
・R1, R2 : IC internal resistor
(Voltage detection precision is tightened up to ±2 % by laser-trimming the R1 and R2)
Vs will fluctuate 1.23 V ±6.0 %.
The reset detection voltage can be adjusted by connecting resistors on the Vs terminal.
Insert pull down resistor R3 (lower resistance than R1) in between Vs-GND, and pull down resistor R4 (lower resistance
than R2) in between Vs-VOUT to adjust the detection voltage.
By doing so, the detection voltage can be adjusted by the calculation below.
Vdet = Vs × [{R2 × R4 / (R2 + R4)} + {R1 × R3 / (R1 + R3)}] / {R1 × R3 / (R1+R3)}
When the output resistance value is as small enough to ignore the IC internal resistance, you can find the detection voltage
by the calculation below.
Vdet ≈ Vs × (R3 + R4 ) / R3
Adjust the resistance value by application as the circuit current will increase due to the added resistor.
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/24
TSZ02201-0G1G0AN00010-1-2
20.Apr.2015 Rev.002
11 Page | ||
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| PDF Descargar | [ Datasheet BD3021HFP-M.PDF ] | |
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