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PDF BD4911FM Data sheet ( Hoja de datos )
| Número de pieza | BD4911FM | |
| Descripción | Multifunction System Power Supply IC | |
| Fabricantes | ROHM Semiconductor | |
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TECHNICAL NOTE
System Power Supply LSIs for use in automotive Electronics
Multifunction System
ESD
Resistance
Power Supply IC
Now available
(with Watchdog Timer)
BD4911FM
zDescription
The BD4911FM multiple-output system power supply features microcontroller output and is capable of operating at super-low
dark current levels. With a built-in reset, with a microcontroller delay, BATTERY/ACCESSORY voltage detection, and mute
function, WDT (Watch Dog Timer)function, the BD4911FM is ideal for car audio and satellite navigation systems.
zFeatures
1) Main regulator Vo1 can be switched between 5.0 V and 3.3 V output using the SEL input voltage, and can be used
with an external boost transistor.
Sub-regulator Vo2 generates 3.3 V output.
Both regulators feature an output current of 150 mA.
2) Built-in WDT reset; monitor time can be set with the CTW capacitor.
WDT operation can be switched on and off using INH input.
3) Circuit current during standby operation (WDT off): 100 µA (TYP)
4) Built-in reduced power detection circuits for Vo1 and Vo2 output
5) Built-in elevated output detection circuit for Vo1
6) The IC monitors the BuM voltage and outputs it to the BuDET1 and BuDET2 pins.
7) The IC monitors the ACCM voltage and outputs it to the ACCM pin when BuDET1 and BuDET2 are low.
8) Built-in mute circuit. Pulse width can be set with the CE capacitor.
9) Built-in power-on reset function for which RESET output can be set with the CTP capacitor.
10) Vo1 generates low-saturation voltage type PMOS output.
11) Built-in overcurrent protection circuit
12) Built-in overvoltage protection circuit
13) Built-in thermal shutdown circuit
14) The 28-pin HSOP-M28 package is ideal for space-saving designs.
zApplications
Car audio and satellite navigation systems
Ver.B Oct.2005
1 page  
zElectrical characteristics (Unless otherwise specified, Ta = 25°C, VIN1 = VIN2 = 13.2 V)
Parameter
Symbol
Limits
Min. Typ. Max.
Unit
Condition
WDT Falling Threshold
VTLWDT1 1.50 1.67 1.83
VTLWDT2 0.9 1.0 1.1
V SEL > 1.5 V
V SEL < 1.0 V
WDT Input Current
IWDT
0.5 1.0 2.0
µA VWDT = 5 V, SEL > 1.5 V
WDT Ddge Pulse Width
TPULSE 100 190 300
µS
WDINH Input Voltage At High Level
VIH
0.8X
Vo1
—
—
V
WDINH Input Voltage Low Level
VIL
—
—
0.3X
Vo1
V
WDT Input Current
IWDINH
1
2
4 µA VWDINH = 5 V, SEL < 1.0 V
[Bu Voltage Detection Circuit (BuM, BuDET)]
BuM Detection Voltage (Rising)
BuDET: H→L, AccDET: H→L
VTHB 1.214 1.252 1.290 V IC without heat sink
BuM Detection Voltage (Falling)
BuDET: L→H, AccDET: L→H
VTLB 1.148 1.184 1.220 V IC without heat sink
BuDET1 High Output Voltage
VBDTH1
Vo1
-0.4
Vo1
-0.2
—
V Iout = -5 mA
BuDET1 Low Output Voltage
VBDTL1 — 0.15 0.40
V Iout = 5 mA
BuDET2 High Output Voltage
VBDTH2
Vo2
-0.4
Vo2
-0.2
—
V Iout = -5 mA
BuDET2 Low Output Voltage
VBDTL2 — 0.15 0.40
V Iout = 5 mA
BuM Input Current
IBM1
IBM2
0 4 110 nA BuM = 1 V
0 20 110 nA BuM = 2 V
[MUTE One-shot Pulse Generation Circuit (MUTE, CE)]
MUTE Pulse Width
Tm1
Tm2
0.6 1.0 1.4
0.6 1.0 1.4
S CE = 1 µF, SEL > 1.5 V
S CE = 1 µF, SEL < 1.0 V
MUTE Pulse On Dalay Time
Td1 0 5 10 µS CE = 1 µF, SEL > 1.5 V
Td2 0 8 16 µS CE = 1 µF, SEL < 1.0 V
CE Charge Resistance 1
RTM1
0.7
1.0
1.3
MΩ
When MUTE is on (resistance while
charging).
CE Charge Resistance 2
RTM2
8.0
11.5 15.0
kΩ
When MUTE is off (resistance when
stabilized after charging).
CE Rapid Discharge Resistance RCEon
—
4
20 Ω Must satisfy Td.
CE Output Saturation Voltage
VCEL — 0.1 0.3 V CE output on, ICE = 0 µA
CE-CMP Threshold (rising)
VTHCE1 3.00 3.33 3.66
VTHCE2 1.98 2.2 2.42
V SEL > 1.5 V
V SEL < 1.0 V
CE-CMP Threshold (falling)
VTLCE1 1.50 1.67 1.83
VTLCE2 0.9 1.0 1.1
V SEL > 1.5 V
V SEL < 1.0 V
MUTE Output Saturation Voltage VMUTEL —
0.2 0.4
V IMUTE = 5 mA
[ACC Voltage Detection & Delay Circuit (ACCM, CD, ACCDET)]
ACCM Detection Voltage (Rising) VTHA 1.214 1.252 1.290 V IC without heat sink, BuM = H
ACCM Detection Voltage (Falling)
VTLA 1.148 1.184 1.220 V IC without heat sink, BuM = H
ACCM Positive Clamp Voltage
VHACC
8
11 14
V IACCM = +5 mA
ACCM Negative Clamp Voltage
VLACC -0.30 -0.15
0
V IACCM = -12 mA
ACCM Input Current 1
IACC1
-5
-1
0
µA ACCM = 0 V
ACCM Input Current 2
IACC2 0 10 110 nA ACCM = 2 V
CD Delay Time
TdLH
TdHL
6 10 14 mS CD = 0.1 µF
6 10 14 mS CD = 0.1 µF
CD Charge Resistance
ICDH 60 90 120 kΩ
CD Discharge Resistance
ICDL
60 90 120 kΩ
CD-CMP Threshold (Rising)
VTHCD1 3.00 3.33 3.66
VTHCD2 1.98 2.2 2.42
V SEL > 1.5 V
V SEL < 1.0 V
CD-CMP Threshold (Falling)
VTLCD1 1.50 1.67 1.84
VTLCD2 0.9 1.0 1.1
V SEL > 1.5 V
V SEL < 1.0 V
ACCDET Output Saturation Voltage VADTL — 0.2 0.4
V IADT = 5 mA
This IC is not designed to be radiation-resistant.
5/16
5 Page 
zBlock diagram, IC package & timing chart
{I/O Timing Chart
VIN1,VIN2
SEL
Vo1
DET1
CTP
RESET
BuM
BuDET1
CE
MUTE
ACCM
CD
ACCDET
CTW(WDINH=H)
Fig.52
{Watchdog timer and runaway operation reset timing chart 1
Prohibit watchdog when the following conditions are both satisfied. ACC: Low level and WDINH: High level.
ACC
Watchdog prohibited Watchdog permitted
WDINH
Watchdog prohibited
ＷＤＴ
CTW
Vo1*2/3
Vo1*1/3
RESET
TWD TWR
Runaway
monitor time Runaway reset time
Fig.53
{Watchdog timer and runaway operation reset timing chart 2
VIN1,VIN
VTHP
Vo1 VTLP
WDINH
ＷＤＴ
Watchdog permitted
Prohibit Permit Prohibit
Permit
CTW
Vo1*2/3
Vo1*1/3
RESET
TPR
TDR
TPR
TDR
Fig.54
{Power-on reset and reduced-voltage reset timing chart
VIN1,VIN2
VTHP
Vo1 VTLP
Reduced voltage detection
DET1
VTHP
Vo2 VTLP
OFF
ON Reduced voltage OFF
detection
DET2
OFF
ON
CTP
Vo1*2/3
Vo1*1/3
TPR
TDR
TPR TDR
RESET
Power-on reset time Reset delay time
TPR
OFF
Fig.55
TDR
{BuDET1, BuDET2, ACCDET, and MUTE timing chart
VTHB
VIN1, VIN2
ACC
Vo1
VTHA
VTLB
ACCDET
BuDET1,2
TdH TdL
TDB1
TDB2
CE
MUTE
VTHCE
Tm
ON
VTLCE
OFF
Td
Tm
ON
TdH
TDB1
Td
Tm
ON
Voltage maintained
with output capacity
VTLA
TdL
TDB2
OFF
Td
ON
Fig.56
11/16
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet BD4911FM.PDF ] | |
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