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PDF BD3021HFP-M Datasheet ( Hoja de datos )

Número de pieza BD3021HFP-M
Descripción 500mA Output LDO Regulators
Fabricantes Rohm 
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BD3021HFP-M datasheet

1 Page

BD3021HFP-M pdf
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.
TSZ2211115001
5/24
TSZ02201-0G1G0AN00010-1-2
20.Apr.2015 Rev.002

5 Page

BD3021HFP-M arduino
BD3020HFP-M BD3021HFP-M
BD3020HFP-M Detection Voltage Adjustment (Resistance value is typical value)
VOUT
VOUT
R4
Vs
R2 = 900 k
10 k
R3 R1 = 330 kVs 1.23 V
VOUT
470 k
RESET
1 k
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.
TSZ2211115001
11/24
TSZ02201-0G1G0AN00010-1-2
20.Apr.2015 Rev.002

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