Large Current External FET Controller Type Switching Regulators
Single/Dual-output
High-frequency Step-down
Switching Regulator(Controller type)
BD9842FV
No.09028EAT06
●Overview
BD9842FV is an IC containing two circuits of switching regulator controller by pulse width modulation system.
Both of two circuits can be used for step-down DC/DC converter operation.
In addition, the package is designed compact, and is optimum for compact power supply for many kinds of equipment.
●Feature
1) High voltage resistance input (Vcc=35V)
2) FET driver circuit is contained (step-down circuit 2 output).
3) Error amplifier reference voltage (1.0V1%) and REG output circuit (2.5V) are contained.
4) Overcurrent detection circuit is contained.
5) Soft start and pause period can be adjusted.
6) Three modes of standby, master, and slave can be switched. (iccs = 0 uA typ in standby mode.)
7) ON/OFF control is enabled independently for each channel. (DT terminal)
●Application
LCD, PDP, PC, AV, Printer, DVD, Projector TV, Fax, Copy machine, Measuring instrument, etc.
●Absolute
maximum rating
Item
Supply voltage
Permissible loss
OUT terminal voltage resistance
C5V terminal voltage resistance
Operation temperature range
Storage temperature range
Joint temperature
Symbol
Vcc
Pd
OUT
C5V
Topr
Tstg
Tjmax
Rating
36
812
*1
Vcc-7V to Vcc
Vcc-7V to Vcc
-40 to +105
-55 to +150
150
Unit
V
mW
V
V
°C
°C
°C
*1 When glass epoxy board 70.0 mm
70.0 mm
1.6 mm is installed onboard. Reduced by 6.5 mW/C above Ta=25C.
●Operating
condition (Ta=25C)
Item
Supply voltage
Output terminal voltage
Timing capacity
Oscillation frequency
STB input voltage
Symbol
Vcc
OUT
CCT
Fosc
STB
Range
3.6 to 35
C5V – Vcc
47 to 3000
100 to 1500
0 to Vcc
Unit
V
V
pF
kHz
V
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/15
2009.05 - Rev.A
BD9842FV
●Electric
characteristics (Ta25C, VCC=6V unless otherwise specified)
Standard value
Item
Symbol
Min.
Typ.
Max.
[VREF output unit]
Output voltage
V
REF
2.450 2.500 2.550
Input stability
Line reg.
－
1
10
Load stability
Load reg.
－
2
10
Current capacity
I
OMAX
2
13
－
[Triangular wave oscillator]
Oscillation frequency
F
OSC
95
106
117
Frequency fluctuation
F
DV
－
0
1
CT source current
I
CTSO
190
200
210
CT sink current
I
CTSI
190
200
210
[Soft start unit]
SS source current
I
SSSO
1.4
2
2.6
SS sink current
I
SSSI
5
12
－
[Pause period adjusting circuit]
DT input bias current
I
DT
－
0.1
1
DT sink current
I
DTSI
1
3.3
－
[Low input malfunction preventing circuit]
Threshold voltage
V
UTH
3.0
3.2
3.4
Hysteresis
V
UHYS
－
0.15
0.25
[Error amplifier]
Non-inverting input reference voltage
V
INV
0.99
1
1.01
Reference voltage supply fluctuation
dVinv
－
1
6
INV input bias current
I
IB
－
0
1
Open gain
AV
70
85
－
Max output voltage
V
FBH
2.30
－
VREF
Min output voltage
V
FBL
－
0.6
1.3
Output sink current
I
FBSI
0.5
1.5
－
Output source current
I
FBSO
50
105
－
[PWM comparator]
1.4
1.5
1.6
Vt
0
Input threshold voltage
(fosc=100kHz)
Vt
100
1.9
2
2.1
[Output unit]
Output ON resistance H
R
ONH
－
4.0
10
Output ON resistance L
R
ONL
－
3.3
10
C5V clamp voltage
V
CLMP
4.5
5
5.5
[Overcurrent protection circuit]
Overcurrent detection threshold voltage
V
OCPTH
0.04
0.05
0.06
OCP-input bias current
I
OCP
-
－
0.1
10
Overcurrent detection delay time
tdocpth
－
200
400
Overcurrent detection minimum
tdocpre
0.8
1.6
－
retention time
[Standby changeover unit]
Single channel stop threshold voltage
V
DTthL
1.1
1.25
1.4
Standby mode setting range
V
STBL
0
－
0.5
Slave mode setting range
V
STBM
2.4
2.5
2.6
Active (master) mode setting range
V
STBH
3
－
V
CC
STB flow-in current
I
STB
－
70
100
[Device overall]
Standby current
I
CCS
－
0
1
Average power consumption
I
CCA
1.5
3
6
* Radiation resistance design is not applied.
Technical Note
Unit
V
mV
mV
mA
kHz
%
µA
µA
µA
mA
µA
mA
V
V
V
mV
µA
dB
V
V
mA
µA
V
V
Ω
Ω
V
V
µA
nS
mS
V
V
V
V
µA
µA
mA
Condition
I
O
=0.1 mA
Vcc=3.6 V→35 V
I
O
=0.1 mA→2 mA
V
REF
=(typ.)＊0.95
C
CP
=1800 pF
Vcc=3.6 V→35 V
CT=1.75 V
CT=1.75 V
SS=0.5 V
SS=0.5 V
DT=1.75 V
DT=1.75 V, (OCP+)-(OCP-)=0.5 V
Vcc start detection
INV=FB
Vcc=3.6 V→35 V
INV=1 V
FB=1.25 V, INV=1.5 V
FB=1.25 V, INV=0.5 V
On duty 0%
On duty 100%
R
ONH
=( V
CC
-OUT)/Iout, Iout=0.1 A
R
ONL
=(OUT-C5 V)/Iout, Iout=0.1 A
V
CLMP
= V
CC
-C5V , V
CC
＞7
V
Voltage between (OCP+) and (OCP-)
OCP+= V
CC,
OCP-= V
CC
-0.5 V
OCP-= V
CC
→V
CC
-0.2 V
OCP-= V
CC
-0.2 V→V
CC
DT terminal H/L
STB=6 V
STB=0 V
INV=0 V, FB=H, DT=1.75 V
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
2/15
2009.05 - Rev.A
BD9842FV
●Reference
data
10
9
Standby Current: ICCS(uA)
Current: ICCA(mA)
8
7
6
5
4
3
2
1
0
-50
-25
0
25
50
75
100
125
VCC=6V
8
7
Circuit Current: ICCA(mA)
6
5
4
3
2
1
0
0
5
10
15
20
25
30
35
40
Ta=25°C
8
7
6
5
4
3
2
1
0
-50
-25
0
Technical Note
VCC=6V
Circuit
25
50
75
100
125
Ambient Temperature: Ta(°C)
Supply Voltage: VCC(V)
Ambient Temperature: Ta(°C)
Fig.1 Standby current temperature
characteristics
Fig.2 Circuit current in operation
Fig.3 Circuit current temperature
characteristics in operation
Reference Output Voltage: VREF (V)
2.520
Reference Voltage: VREF(V)
2.515
Reference Voltage: VREF(V)
2.510
2.505
2.500
2.495
2.490
2.485
2.480
0
5
10
15
20
25
30
35
40
Supply Voltage: VCC(V)
Ta=25°C
2.520
2.515
2.510
2.505
2.500
2.495
2.490
2.485
2.480
0
0.5 1
1.5 2
2.5 3
3.5 4 4.5 5
Ta=25°C
VCC=6V
2.520
2.515
2.510
2.505
2.500
2.495
2.490
2.485
2.480
-50
-25
0
25
50
75
100
125
VCC=6V
Reference Output Current: IREF(mA)
Ambient Temperature: Ta(°C)
Fig.4 VREF supply voltage
characteristics
3.5
3.4
UVLO Threshold: VUTH(V)
3.3
3.2
3.1
3
2.9
2.8
2.7
2.6
2.5
-50
-25
0
25
50
75
100
125
Loop Gain :Closed [ dB ]
Fig.5 VREF current capability
Fig.6 VREF temperature
characteristics
100
80
60
40
20
0
-20
Gain
Phase
0
-45
ErrAmp Input Current: IIB(µA)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
-90
Phase
-135
-180
Phase Shift [ deg ]
VCC=6V
Ta=25℃
Gain
100
1K
-225
-270
Ambient Temperature: Ta(°C)
Frequency [Hz]
10K
100K
1M
10M
ErrAmp Input Voltage: VINV(V)
Fig.7 UVLO threshold temperature
characteristics
Fig.8 acteristics
Fig.9 Error amplifier input current
1.01
ErrAmp Reference Voltage: VINV(V)
FB Source Current: IFBSO(µA)
1.006
1.004
1.002
1
0.998
0.996
0.994
0.992
0.99
-50
-25
0
25
50
75
100
125
VCC=6V
120
100
80
60
40
20
0
0
1
2
3
4
ErrAmp Output Voltage: VFB(V)
Ta=-40°C
VCC=6.0V
FB Sinkt Current: IFBSI(mA)
1.008
140
Ta=85°C
Ta=25°C
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
0
0.5
1
1.5
2
VCC=6.0V
Ta=85°C
Ta=25°C
Ta=-40°C
Ambient Temperature: Ta(°C)
ErrAmp Output Voltage: VFB(V)
Fig.10 Error amplifier reference voltage
temperature characteristics
Fig.11 FB output source current
Fig.12 FB output sink current
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
3/15
2009.05 - Rev.A
BD9842FV
●Reference
data
4.0
SS Source Current: ISSso(µA)
SS Sink Current: ISSsi(mA)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
VCC=6.0V
35
30
25
20
15
10
5
0
0
0.5
1
1.5
2
SS Voltage: VSS(V)
VCC=6.0V
Ta=-40°C
Ta=25°C
Ta=85°C
Technical Note
SS Source Current: ISSso(uA)
5
4
3
2
1
0
-50
VCC=6.0V
-25
0
25
50
75
100
125
SS Voltage: VSS(V)
Ambient Temperature: Ta(°C)
Fig.13 SS source current
Fig.14 SS sink current
Fig.15 SS source current
temperature characteristics
120
CCP=1800pF
DT Input Current: IDT(µA)
Frequency: FOSC(kHz)
110
7
6
Dt SInk Current: IDT(mA)
5
4
3
2
1
0
-25
0
25
50
75
100
125
0
0.5
1
1.5
2
2.5
VCC=6.0V
Ta=25°C
7
6
5
4
3
2
VCC=6.0V
1
0
0
0.5
1
1.5
2
2.5
DT Input Voltage: VDT(V)
Ta=-40°C
Ta=25°C
Ta=85°C
100
VCC=6V
90
80
-50
Ambient Temperature: Ta(°C)
DT Input Voltage: VDT(V)
Fig.16 Oscillation frequency
temperature characteristics
Fig.17 DT bias current
Fig.18 DT sink current
100
90
80
70
60
50
40
30
20
10
0
1.4
1.6
1.8
VCC=6.0V
Ta=25°C
100
90
80
70
60
50
40
30
20
10
0
1.4
40
35
VCC=6.0V
Ta=25°C
30
IDS(mA)
25
20
15
10
5
1.6
1.8
2
2.2
0
VCC
VCC
-0.05
VCC
-0.10
VOUT(V)
VCC
-0.15
VCC
-0.20
Ta=-40°C
Ta=25°C
Ta=85°C
VCC=6.0V
Ta=25°C
Output Duty Cycle: Duty(%)
2
2.2
DT Input Voltage: VDT(V)
Output Duty Cycle:Duty(%)
DT Input Voltage: VDT(V)
Fig.19 Output Duty-VDT
characteristics (100kHz)
Fig.20 Output Duty-VDT
characteristics (1.5MHz)
Fig.21 Output ON resistance H
(R
ONH
)
40
35
30
IDS(mA)
25
20
15
10
5
0
C5V
C5V
-0.05
C5V
-0.10
VOUT(V)
C5V
-0.15
C5V
-0.20
VCC=6.0V
Ta=-40°C
Ta=25°C
ISTB(µA)
Ta=85°C
800
VCC=35V
OCP Threshold: Vocpth(mV)
700
600
500
400
300
200
100
0
0
5
10
15
20 25
VSTB(V)
30
35
40
Ta=85°C
Ta=25°C
Ta=-40°C
70
65
60
55
50
45
40
35
30
-50
-25
0
25
50
75
100
125
VCC=6V
Ambient Temperature: Ta(°C)
Fig.22 Output ON resistance L
(R
ONH
)
Fig.23 STB flow-in current
Fig.24 Overcurrent detection voltage
temperature characteristics
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
4/15
2009.05 - Rev.A
BD9842FV
●Reference
data
5.0
4.5
4.0
3.5
VC5V(V)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
50
100
150
200
250
5.5
5.4
5.3
VCC=6.0V
Ta=25°C
VCC-VC5V(V)
10
9
8
7
6
5
4
3
2
1
0
0
5
10
15
20
25
30
35
40
0
5
10
Technical Note
VCC-VC5V(V)
VCC=5.0V
Ta=25°C
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
Ta=25°C
15
20
25
30
35
40
IC5V(mA)
IC5V(mA)
Supply Voltage: VCC(V)
Fig.25 C5V saturation voltage
Fig.26 C5V load regulation
Fig.27 C5V line regulation
●Block
diagram
VCC
VCC
Muster mode
latch
VREF
STB
OCP1
+
OCP1
-
VCC
+
-
OCP1
2.8V
VCC
+
-
C5V
C5V
50mV±10mV
VREF
DT1
REG
(2.5V)
STB
MASTER
/SLAVE
Q S
R
UVLO
-
+
OCP
REG
(VCC-5V)
C5V
DT1OFF
DT
DT1Low
FB1
VREF
2μA
1V±10mV
+
+
ERR
-
+
+
PWM
-
1.25V
VCC
SS1
SS1OFF
LS
DRV
C5V
OUT1
INV1
PROTECTION LOGIC
OSC
200μA
+
-
-
200μA
OCP1
2.0V
1.5V
UVLO
TSD
MASTER
/SLAVE
Hold time
(1.6msec)
DT1Low
SS1OFF
DT1OFF
TSD
TSD
Hold time
(0.2msec)
DT2OFF
DT2Low
SS2OFF
VCC
VREF
3.2V
2.2V
3V
CT
INV2
2V
1.5V
OCP2
UVLO
UVLO
Hold time
(1.6msec)
C5V
VREF
2μA
-
+
ERR
+
-
+
PWM
+
VCC
DT2OFF
-
+
OCP2
-
50mV±10mV
VCC
SS2
SS2OFF
1V±10mV
LS
DRV
C5V
OUT2
FB2
DT2
DT
DT2Low
OCP
+
C5V
1.25V
OCP2+ OCP2-
GND
Fig.28 Block diagram
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
5/15
2009.05 - Rev.A
京公网安备 11010802033920号
EEWORLD
