Rainbow Electronics BD4201FV User Manual
BD4201FV
Regulators
Battery Backup IC
BD4201FV
BD4201FV is a battery backup IC. Switch that detect battery voltage and sw itch into back up power supply and
3-channel regulator are incorporated into a single chip.
Current consumption is 15µA (Max.). This IC is perfect for portable appliances.
zApplica tions
Portable video, Digital camera
zFeatures
1) Low quiescent current
Normal operation < 15.0µA Max.
Backup mode < 2.1µA Max.
2) 3 high accurate voltage regulators
3) Low dropout voltage, and high accurate voltage
detectors (CS, RESET)
4) Control circuit; Backup
5) Special sequence;
For shifting to the backup mode. It need to make
main battery over +Vdet1 once.
zAbsolute maximum ratings (Ta=25°C)
Parameter
Main power supply input Voltage
Back up power supply input Voltage
CS output Voltage
RESRT output Voltage
Power dissipation
Operating temperature
Storage temperature
+
∗
70mm 70mm 1.6mm Glass fiber basis subtract 3.5mW / C when over 25 C
+
Symbol Limits
Vin 15
Vbat 15
Vcs
VRES
Pd
Topr
Tstg
zCommendable operating st atus (Ta=25°C)
Parameter Min. Max. UnitTyp.Symbol
Power supply range
Backup power supply range
Load current range1
Load current range2
Load current range3
Vin 2.0 15.0 V
Vbat 2.0 15.0 V
Iro 0 20.0
Iout 0 60.0
Ich
0 20.0
zExternal dimensions (Unit : mm)
3.0±0.2
0.2
±
4.4
6.4±0.3
1
0.1
1.15±0.1
(0.52)
SSOP-B8
Unit
V
V
15
15
∗
350
−30 to +85
−40 to +125
-
-
-
-
-
V
V
mW
C
C
mA
mA
mA
548
0.3Min.
0.15±0.1
0.1
0.22±0.1
0.65
1/8
Regulators
zBlock diagram
BD4201FV
Vout
Vbat
M1
Vch
REG3
RESET Voltage detector
DELAY
RESET
R
Q
Vsw2 Detection circuit
S
S
R
Q
Vss
REG2
Switch control circuit
Vro
Vsw1 Detection
circuit
CS Voltage
detection
Vin
CS
Fig. 1
2/8
REG1
Regulators
zCircuit around pin
BD4201FV
Pin No. Pin Name
1
3 4
5
Vss
Vbat
Vbat
RESET
RESET
RESET voltage detector
output Pin
Function
Ground Pin
Vss
Back up power supply
input Pin
Pin No. Pin Name Function
2
6
Vch
Vch
CS
CS
Vout
Regulator 3 output Pin
Vin
CS voltage detector output Pin
Regulator2 output Pin
Vin
Vbat
Vout
7
Vin
Main power supply input Pin Regulator1 output Pin
Vin
8
3/8
Vro
Vro
Vin
Vin
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