TECHNICAL NOTE
High-performance Regulator IC Series for PCs
Ultra Low Dropout
Linear Regulator Controllers
for PC Chipsets
BD3504FVM, BD3500FVM, BD3501FVM, BD3502FVM
●Description
The BD3500/01/02/04FVM is an ultra-low dropout linear regulator controller for chipset that can achieve ultra-low voltage
input to ultra-low voltage output. By using N-MOSFET for external power transistor, the controller can be used at ultra-low
I/O voltage difference up to voltage difference generated by ON resistance. In addition, because best suited power
transistor can be chosen in accord with the output current, downsizing and cost reduction of the set can be achieved.
Because by reducing the I/O voltage difference, large current output is achieved and conversion loss can be reduced,
switching power supply can be replaced. BD3500/01/02/04FVM does not need any choke coil, diode for rectification and
power transistor which are required for switching power supply, total cost of the set can be reduced and compact size can
be achieved for the set. Using external resistors, optional output from 0.65V to 2.5V can be set. In addition, since voltage
output start-up time can be adjusted by using the NRCS terminal, it is possible to flexibly meet the power supply sequence
of the set.
●Features
1) Reduced rush current by NRCS
2) Built-in driver for external Nch h transistor
3) Adoption of MSOP8 package: 2.9 x 4.0 x 0.9 (mm)
4) Built-in timer latch short protection circuit
5) Built-in low input maloperation prevention circuit
6) Output voltage variable type
7) Built-in overheat protection circuit
●Applications
Mobile PC, desktop PC, digital home appliances
●Line
up
Parameter
Output Voltage
NRCS
(Soft start)
Timer latch short
protection circuit
V
IN
UVLO
External FET
GATE Drive Current
BD3500FVM
1.8V (Fix)
○
(Independent Setting)
BD3501FVM
1.5V (Fix)
○
(Independent Setting)
BD3502FVM
1.2V (Fix)
○
(Independent Setting)
BD3504FVM
Variable(0.65½2.5V)
○
(Same Timer Latch)
○
(Independent Setting)
○
(Independent Setting)
○
(Independent Setting)
○
(Same NRCS)
Hysterisis
+1/-3mA
Hysterisis
+1/-3mA
Hysterisis
+1/-3mA
Detected at start-up only
(set by external resistor)
+3/-3mA
Oct. 2008
●
ABSOLUTE MAXIMUM RATINGS (Ta=25℃)
◎BD3500/01/02FVM
Parameter
Input Voltage
Drain Voltage (VIN)
Enable Input Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
*1 However, not exceeding Pd.
*2 Pd derating at 3.5mW/℃ for temperature above Ta=25℃
Symbol
VCC
VIN
Ven
Pd
Topr
Tstg
Tjmax
Limit
7 *
1
7
7
437.5 *
2
-10½+100
-55½+150
+150
Unit
V
V
V
mW
℃
℃
℃
◎BD3504FVM
Parameter
Supply Voltage
Drain Voltage
Enable Input Voltage
Power dissipation
Operating temperature range
Storage temperature range
Maximum Junction Temperature
*3 However, not exceeding Pd.
*4 Pd derating at 3.5mW/℃ for temperature above Ta=25℃
Symbol
VCC
VD
Ven
Pd
Topr
Tstg
Tjmax
Limit
7 *
3
7
7
437.5 *
4
-10½+100
-55½+150
+150
Unit
V
V
V
mW
℃
℃
℃
●RECOMMENDED
OPERATING CONDITIONS
◎BD3500/01/02FVM
Parameter
Symbol
Supply Voltage
VCC
Drain Voltage(VIN)
VIN
Enable Input Voltage
Ven
Capacitor on NRCS Terminal
CNRCS
Capacitor on SCP Terminal
CSCP
★
No radiation-resistant design is adopted for the present product.
MIN
4.5
Vo×1.15
-0.3
0.001
0.001
MAX
5.5
5.5
5.5
1
1
Unit
V
V
V
uF
uF
◎BD3504FVM
Parameter
Supply Voltage
Drain Voltage
Enable Input Voltage
Capacitor in NRCS pin
Output Voltage
Symbol
VCC
VD
Ven
CNRCS
VOUT
MIN
4.5
0.65
-0.3
0.001
0.65
MAX
5.5
5.5
5.5
1
2.5
Unit
V
V
V
uF
V
★
No radiation-resistant design is adopted for the present product.
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●ELECTRICAL
CHARACTERISTICS (unless otherwise noted, Ta=25℃ VCC=5V Vin=3.3V Ven=3V)
◎BD3500FVM/BD3501FVM/BD3502FVM
Standard Value
Parameter
Symbol
Unit
Condition
MIN
TYP
MAX
Bias Current
ICC
-
0.8
1.6
mA
Shut Down Mode Current
IST
-
0
10
uA Ven=0V
Output Voltage 1
Vo1
1.782
1.800
1.818
V
Io=50mA
(BD3500FVM)
Output Voltage 1
Vo1
1.485
1.500
1.515
V
Io=50mA
(BD3501FVM)
Output Voltage 1
Vo1
1.188
1.200
1.212
V
Io=50mA
(BD3502FVM)
Output Voltage 2
Vcc=4.5V to 5.5V ,Io=0 to 3A
Vo2
1.746
1.800
1.854
V
(BD3500FVM)
Ta=-10℃ to 100℃(※)
Output Voltage 2
Vcc=4.5V to 5.5V ,Io=0 to 3A
Vo2
1.455
1.500
1.545
V
(BD3501FVM)
Ta=-10℃ to 100℃(※)
Output Voltage 2
Vcc=4.5V to 5.5V ,Io=0 to 3A
Vo2
1.164
1.200
1.236
V
(BD3502FVM)
Ta=-10℃ to 100℃(※)
Line Regulation
Reg.l
-
0.1
0.5
%/V VCC=4.5V to 5.5V
Load Regulation
Reg.L
-
0.5
10
mV Io=0 to 3A
[Enable]
High Level Enable Input
Enhi
2
-
Vcc
V
Voltage
Low Level Enable Input
Enlow
-0.3
-
0.8
V
Voltage
Enable Pin Input Current
Ien
-
7
10
uA Ven=3V
[NRCS]
Vnrcs=0.5V,VCC=4.5V to 5.5V
NRCS Charge Current
Inrcs
14
20
26
uA
Ta=-10℃ to 100℃ (※)
NRCS Standby Voltage
Vnrcs
-
0
50
mV Ven=0V
[Voltage Feed Back]
VFB Input Bias Current
IFB
-
0.7
1.2
mA Ven=3V
VFB Standby Current
FBSTB
150
-
-
mA Ven=0V,VFB=1V
[Output MOSFET Driver]
MOSFET Driver Source
IGSO
0.5
1
1.5
mA VFB=Vo-0.1V,G=Vo+1V
Current
MOSFET Driver Sink
IGSI
2
3
4
mA VFB=Vo+0.1V,G=Vo+1V
Current
[UVLO]
VCC UVLO
VccUVLO
4.2
4.35
4.5
V
Vcc:Sweep up
VCC UVLO Hysteresis
Vcchys
100
160
220
mV Vcc:Sweep down
VIN UVLO
VINUVLO Vo×1.05 Vo×1.1 Vo×1.15
V
VIN:Sweep up
VIN UVLO Hysteresis
VINhys
100
160
220
mV VIN:Sweep down
[SCP]
VSCP=0.5V,VCC=4.5V to 5.5V
SCP Charge Current
Iscpch
14
20
26
uA
Ta=-10℃ to 100℃ (※)
SCP Discharge Current
IscpDi
0.5
-
-
mA VSCP=0.5V
SCP Threshold Voltage
Vscpth
1.2
1.3
1.4
V
Short Detect Voltage
Vscp
Vo×0.6 Vo×0.7 Vo×0.8
V
SCP Stand-by Voltage
VSTB
-
0
50
mV
(※) Design Guarantee
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