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Data eet
Datasheet
Co
ontroller typ
pe switching
g regulator with
w high fre
equency, hig
gh accuracy
y external FE
ET
Autom
A
matica
ally Contr
C
rolled
d
BuckB
-Boos
st Sw
witching Re
egula
ator
BD9035AE
B
FV-C
Ge
eneral Descrip
ption
The BD9035
5AEFV-C is a buck-boost sw
witching contrroller
with a high withstand vo
oltage and a wide input ra
ange
(VIN=3.8~30
0V) capable of
o generating buck-boost ou
utput
with one in
nductor. The IC has a ±7% high accu
uracy
switching fre
equency for th
he entire operrating tempera
ature
range (Ta=-4
40°C~+125°C
C). Because off the automati cally
controlled b
buck-boost sysstem the BD9
9035AEFV-C also
has a highe
er efficiency compared
c
to regular switcching
regulators e
employing Sep
pic or H-Bridge
e systems.
Key
y Specificatio
ons
„Input voltage
e range:
atures
Fea
„ Power su
upply voltage: 40V (maximum
m rating)
„ Automaticcally controlled buck-boost system.
„ ±7% High
h accuracy sw
witching freque
ency
(Ta=-40°C
C~+125°C).
„ PLL circuit for external synchronization:
600kHz
100kHz~6
„ Two-stage overcurrent protection through one exte
ernal
resistor
„ Various p
protection funcctions
„ Undervolttage, overvoltage output de
etection circuit &
constant output monito
or pin (PGOOD
D)
00 Qualified
„ AEC-Q10
ckage
Pac
HTSSOP-B2
24
3.8V to 30V
V
(Initial startup is over 4.5V
V)
100kHz to 600kHz
„Oscillation frequency:
„Reference voltage
v
accuraacy:
0.8V±1.5%
%
„Circuit curre
ent at shutdow
wn:
0μA (Typ..)
„Operating te
emperature raange:
-4
40℃ to +125℃
℃
Ap
pplications
„ Automotivve micro contrroller, car audio and navigattion
system, L
LCD TV, PDP TV, DVD, PC, etc.
W(Typ.) x D((Typ.) x H(Maxx.)
7.80mm x 7.60mm x 1.00m
mm
Figure 1. HT
TSSOP-B24
pical Application Circuit
Typ
Figure
e 2. Typical ap
pplication circu
uit diagram
○P
Product structure
e:Silicon mono
olithic integrated
d circuit
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2
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Z22111・14・0
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○Thiis product is nott designed for protection againsst radioactive ra
ays
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TSZ002201-0T1T
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02
Datasheet
BD9035AEFV-C
Pin Configuration
(TOP VIEW)
GND
CLKOUT
SYNC
TEST
VDD
RT
OUTL
SS
PGND
OVPLVL
N.C.
FB
VL
COMP
N.C.
PGOOD
OUTH
VREG3
N.C.
VREG5
VCC
EN
CL
VCCCL
Figure 3. Pin configuration
Pin Description
Pin No.
Symbol
1
GND
2
Function
Pin No.
Symbol
Function
Ground pin
13
VCCCL
Overcurrent detection setting pin 1
TEST
Test pin
14
EN
3
VDD
NchFET drive supply pin
15
VREG5
5V internal power supply pin
4
OUTL
NchFET drive pin
16
VREG3
3.5V internal power supply pin
5
PGND
Power GND pin
17
PGOOD
Power good output pin
6
N.C.
Not connected
18
COMP
7
VL
PchFET gate clamp pin
19
FB
8
N.C.
Not connected
20
OVPLVL
9
OUTH
PchFET drive pin
21
SS
Soft start time setting pin
10
N.C.
Not connected
22
RT
Frequency setting pin
11
VCC
Power supply pin
23
SYNC
12
CL
Overcurrent detection setting pin 2
24
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Output ON/OFF pin
Error-amp output pin
Feedback pin
Overvoltage detection setting pin
External
input pin
synchronization
pulse
CLKOUT Clock pulse output pin
TSZ02201-0T1T0AL00110-1-2
19.Feb.2014 Rev.002
Datasheet
BD9035AEFV-C
Block Diagram
0.2V
0.1V
0.8V
1.6V
0.72V
0.88V
1.25V
Figure 4. Block diagram
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Datasheet
BD9035AEFV-C
Description of Blocks
■Error amplifier (Error Amp)
The error amplifier compares the output feedback voltage to the 0.8V reference voltage and provides the comparison result
as COMP voltage, which is used to determine the switching duty. Because at startup, the soft start is triggered based on the
soft start voltage, the COMP voltage is limited by the soft start voltage.
■Oscillator (OSC)
The oscillation frequency is determined by the RT resistance and the current generated by the pin voltage. The oscillation
frequency can be set in the range of 100 kHz to 600 kHz.
■SLOPE
The slope block uses the clock produced by the oscillator to generate a sawtooth wave and sends this wave to the PWM
comparator.
■PWM_BUCK
The PWM_BUCK comparator determines the switching duty by comparing the output COMP voltage of the error amp, with
the triangular wave of the SLOPE block.
■PWM_BOOST
The PWM_BOOST comparator determines the switching duty by comparing the output voltage of the inverting amplifier, with
the triangular wave of the SLOPE block.
■PGOOD pin
1) Output overvoltage detection (OVP)
The PGOOD pin monitors the OVPLVL voltage and outputs “H” if the voltage is less than 0.88V (Typ.) and outputs “L”
if the voltage exceeds 0.88V (Typ.).
2) Output undervoltage detection (SCP)
The PGOOD pin monitors the output voltage (FB) and outputs “H” if the output voltage exceeds 90% (Typ.) and
outputs “L” if the voltage is less than 90% (Typ.).
Because the PGOOD pin is an open drain output, a pull up resistor should be connected when the pin is used.
■Overcurrent protection function (OCP_L, OCP_H)
The overcurrent protection has a two-stage system with a control method as shown below.
1) OCP low level operations
In case the inter VCCL-CL pin voltage exceeds 100mV (Typ.) the chip goes into OCP low level operations and the
OUTH and OUTL pin pulses are limited. Also, in case this pulse limitation status continues for 256clk in a situation
where the FB pin voltage drops below the undervoltage detection voltage VLOW, the soft start pin capacitor is
discharged and the output is turned OFF for 8192clk.
During the 8192clk in which the output is turned OFF the logic of OUTH and OUTL pin changes as follows; OUTH=H
and OUTL=H. After the 8192clk the chip returns to normal operations and the soft start pin is recharged.
2) OCP high level operations
In case the inter VCCL-CL pin voltage exceeds 200mV (Typ.), the chip goes into OCP high level operations, the soft
start pin capacitor is discharged and the output is turned OFF for 8192clk. During the 8192clk in which the output is
turned OFF the logic of OUTH and OUTL pin changes as follows; OUTH=H and OUTL=H. After the 8192clk the chip
returns to normal operations and the soft start pin is recharged.
Figure 5. Timing chart of two-stage overcurrent protection operations
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Datasheet
BD9035AEFV-C
■Overvoltage protection function (OVPH)
In case the OVPLVL pin voltage exceeds 1.25V (Typ.), the soft start pin capacitor is discharged and the output is turned OFF
for 8192clk. During the 8192clk in which the output is turned OFF the logic of OUTH and OUTL pin changes as follows;
OUTH=H and OUTL=H. After the 8192clk the chip returns to normal operations and the soft start pin is recharged.
Figure 6. Overvoltage protection timing chart
■Soft Start
The soft start block provides a function to prevent the overshoot of the output voltage Vo through gradually increasing the
normal rotation input of the error amplifier when power supply turns ON to gradually increase the switching duty. The soft
start time is set by the charge capacity of the soft start pin capacitor. (Refer to P. 17)
■Low voltage lockout circuit (UVLO)
This is a Low Voltage Error Prevention Circuit.
This prevents internal circuit error during increase of Power supply Voltage and during decline of Power supply Voltage.
If the VCC drops below 3.4V (typ.), the UVLO is activated and the circuit is shut down.
■Thermal protection circuit (TSD)
In order to prevent thermal destruction/thermal runaway of this IC, the TSD block will turn OFF the output when the chip
temperature reaches approximately 150℃ or more. When the chip temperature falls to a specified level from thermal
shutdown detection, the output will reset. However, since the TSD is designed to protect the IC, the margin for thermal
design must be provided to guarantee that the chip junction temperature should be less than 150°C, which is the thermal
shutdown detection temperature.
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Datasheet
BD9035AEFV-C
Absolute Maximum Ratings
Parameter
Symbol
Limits
Unit
VCC
40 *1
V
EN
VCC
V
VCCCL
VCC
V
VCL
VCCCL
V
VCC-VL
13
V
VDD
VCC or 7 (whichever is lower)
V
VREG3 voltage
VREG3
VCC or 7 (whichever is lower)
V
VREG5 voltage
VREG5
VCC or 7 (whichever is lower)
V
SS voltage
SS
VREG3
V
FB voltage
FB
VREG3
V
OVPLVL
VREG3
V
COMP voltage
COMP
VREG3
V
SYNC voltage
SYNC
VREG3
V
PGOOD
VREG3
V
Pd
4.00
W
Operating temperature range
Topr
-40~+125
ºC
Storage temperature range
Tstg
-55~+150
ºC
Tjmax
150
ºC
VCC voltage
EN voltage
VCCCL voltage
CL voltage
Inter VCC-VL voltage
VDD voltage
OVPLVL voltage
PGOOD voltage
Power dissipation *2
Junction temperature
*1
*2
Pd and ASO should not be exceeded.
If mounted on a standard ROHM 4 layer PCB (copper foil area: 70x70mm) (Standard ROHM PCB size: 70x70x1.6mm)
Reduce by 32mW for every 1℃ increase. (Above 25℃)
Recommended Operating Rating(Ta=-40℃~125℃)
Maximum ratings
Parameter
Symbol
Unit
Min.
Max.
Voltage power supply
VCC
3.8 *3
30
V
Oscillation frequency
FOSC
100
600
kHz
FSYNC
100
600
kHz
External synchronization frequency
*3
Initial startup is over 4.5V
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Datasheet
BD9035AEFV-C
Electrical Characteristic (unless otherwise specified: Ta=-40~125°C, VCC=12V, EN=5V)
Limits
Parameter
Symbol
Unit
MIN.
TYP.
MAX.
Condition
【Circuit Current】
Circuit current
IVCC
-
7
15
mA
IST
-
0
10
μA
EN pin ON threshold voltage
VENON
2.5
-
-
V
EN pin OFF threshold voltage
VENOFF
-
-
0.5
V
REN
188
375
750
kΩ
VVREG3
3.3
3.5
3.7
V
VVREG5
4.5
5.0
5.4
V
VUVLO
3.1
3.4
3.7
V
VUVLOHYS
0.4
0.6
0.8
V
FB input bias current
IFB
-
0
-
μA
FB=VFB2
Reference voltage 1
VFB1
0.792
0.800
0.808
V
Ta=25 ºC
Reference voltage 2
VFB2
0.788
0.800
0.812
V
Ta=-40 ºC~+105 ºC
ISS
5
10
15
μA
SS=0.1V
Oscillation frequency
FOSC
326
350
375
kHz
RT=33kΩ
External synchronization
frequency
FSYNC
-
350
-
kHz
SYNC=350kHz
SYNC threshold voltage
VSYNC
0.5
1.8
2.5
V
SYNC pull down resistance
RSYNC
125
250
500
kΩ
SYNC input maximum ON duty
DONMAX
80
-
-
%
SYNC input minimum ON duty
DONMIN
-
-
20
%
Circuit current at shutdown
EN=0V
【EN】
EN pull down resistance
【VREG3】
VREG3 output voltage
【VREG5】
VREG5 output voltage
【UVLO】
UVLO_VCC detection voltage
UVLO hysteresis voltage
【Error amp】
【Soft start】
Soft start charge current
【Oscillator】
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SYNC=3V
TSZ02201-0T1T0AL00110-1-2
19.Feb.2014 Rev.002
Datasheet
BD9035AEFV-C
Parameter
Symbol
OUTH pin upper ON resistance
Limits
Unit
Condition
MIN.
TYP.
MAX.
RONHH
-
1.7
-
Ω
OUTH pin lower ON resistance
RONHL
-
3
-
Ω
OUTL pin upper ON resistance
RONLH
-
24
-
Ω
OUTL pin lower ON resistance
RONLL
-
22
-
Ω
Boost max duty 1
DBSTMAX1
-
92
-
%
f=600kHz
Boost max duty 2
DBSTMAX2
60
-
-
%
VCC=3.8V
VCL1
86
100
114
mV
Inter VCC-VL voltage
VCL2
172
200
228
mV
Inter VCC-VL voltage
PGOOD pin ON resistance
RPG
-
0.1
0.4
kΩ
PGOOD=0.15V,FB=0V
PGOOD pin leak current
IPG
-
0
1
μA
PGOOD=3.3V,FB=0.8V,
Ta=-40~+105 ºC
VOVER
0.85
0.88
0.91
V
OVPLVL voltage
VLOW
0.70
0.72
0.74
V
FB voltage
【Driver】
【OCP】
Overcurrent detection CL pin
voltage 1
Overcurrent detection CL pin
voltage 2
【PGOOD】
Output overvoltage detection
voltage
Output undervoltage detection
voltage
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Datasheet
BD9035AEFV-C
95
10
90
9
85
8
80
75
f=350kHz
Vo=6V
70
65
VCC=3.8V
60
CIRCUIT CURRENT
AT SHUTDOWN : Istv [μA]
EFFICIENCY [%]
Typical Performance Curves (unless otherwise specified: Ta=25°C)
VCC=6V
55
7
6
5
4
3
2
1
VCC=12V
50
0
0.0
0.5
1.0
1.5
2.0
-40
LOAD CURRENT [A]
-20
0
20
40
60
80
100 120
AMBIENT TEMPERATURE : Ta[℃]
Figure 7. Efficiency
(Vo=6V, fosc=350 kHz)
Figure 8. Circuit current at shutdown vs.
temperature characteristics
9.0
1.0
7.0
0.9
REFERENCE VOLTAGE [V]
CIRCUIT CURRENT [mA]
8.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0.8
0.7
0.6
-40
-20
0
20
40
60
80
-40
100
0
20
40
60
80
100
AMBIENT TEMPERATURE : Ta[℃]
AMBIENT TEMPERATURE : Ta[℃]
Figure 9. Circuit current vs. temperature
characteristics
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-20
Figure 10. Reference voltage vs.
temperature characteristics
9/23
TSZ02201-0T1T0AL00110-1-2
19.Feb.2014 Rev.002
Datasheet
BD9035AEFV-C
Typical Performance Curves (unless otherwise specified: Ta=25°C)
350
OSILATING FREQUENCY : FOSC [kHz]
INTER VCCL-CL PIN VOLTAGE [mV]
250
200
150
100
50
VCL1
VCL2
0
349
348
347
346
345
344
343
342
RT=33kΩ
341
340
-40
-20
0
20
40
60
80
100
-40
AMBIENT TEMPERATURE : Ta[℃ ]
0
20
40
60
80
100
AMBIENT TEMPERATURE : Ta[℃]
Figure 11. Overcurrent detection CL pin voltage
vs. temperature characteristics
Figure 12. Oscillating frequency vs. temperature
characteristics
11.0
4.3
10.8
4.2
UVLO THRESHOLD VOLTAGE [V]
CHARGE CURRENT : Iss [μA]
-20
10.6
10.4
10.2
10.0
9.8
9.6
9.4
4.1
4.0
3.9
3.8
3.7
Detection voltage(VUVLO)
3.6
Return voltage
3.5
9.2
9.0
3.4
-40
-20
0
20
40
60
80
100
-40
AMBIENT TEMPERATURE : Ta[℃]
0
20
40
60
80
100
120
AMBIENT TEMPERATURE : Ta[℃]
Figure 13. Soft start charge current vs.
temperature characteristics
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-20
Figure 14. UVLO detection/return voltage vs.
temperature characteristics
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19.Feb.2014 Rev.002
Datasheet
BD9035AEFV-C
1.2
2.05
FB PIN BIAS CURRENT : IFB [μA]
EN THRESHOLD VOLTAGE : VEN [V]
2.10
2.00
1.95
1.90
1.85
1.80
1.75
1.70
1.0
0.8
0.6
0.4
0.2
FB=0V
0.0
-40
-20
0
20
40
60
80
100
-40
-20
AMBIENT TEMPERATURE : Ta[℃]
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
0
20
40
60
80
60
80
100
0.90
0.85
VOVER
0.80
VLOW
0.75
0.70
-40
100
-20
0
20
40
60
80
100 120
AMBIENT TEMPERATURE : Ta[℃]
AMBIENT TEMPERATURE : Ta[℃]
Figure 17. PGOOD pin ON resistance vs.
temperature characteristics
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40
Figure 16. FB pin bias current vs. temperature
characteristics
OUTPUT OVER / LOW SENSE VOLTAGE [V]
PGOOD ON RESISTANCE : PRG [kΩ]
0.20
-20
20
AMBIENT TEMPERATURE : Ta[℃]
Figure 15. EN threshold voltage vs. temperature
characteristics
-40
0
Figure 18. Output overvoltage / undervoltage
detection voltage vs. temperature characteristics
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Datasheet
BD9035AEFV-C
Application Example
N.B. There are many factors (PCB, output current, etc.) that can affect the DCDC characteristics.
Please verify and confirm using practical applications.
N.B. No connection (N.C) pin should not be connected to any other lines.
N.B. Be sure to connect the TEST pin to ground.
N.B. In case the external synchronization function is not used, be sure to connect SYNC pin to ground.
N.B. This IC is not designed to operate as BOOST or BUCK application with single MOSFET. Be sure to use both M1 & M2.
N.B. If EN pin is connected to VCC pin, please insert REN 150kΩ between the pins.
REN
EN
VREG3
CVCCA CVCCB
VCC
BAT
CVREG3
VCCCL
power gnd
VREG5
RCL
CVREG5
power gnd
CL
power gnd
CLKOUT
CVL
M1
OUTH
DB
SYNC
Vo
RT
L1
VL
RRT
Vo
COMP
RCO
CFB
CCOA
Vo
power gnd
power gnd VREG5
CCOB
RFBB
RFBC
DA
CVO
VDD
FB
M2
OUTL
RFBA
PGND
ROVB
OVPLVL
VREG3
ROVA
SS
TEST
CVDD
GND
PGOOD
power gnd
RPGD
CSS
An example of parts values:
In case of VCC=3.8~30V, Vo=5V, Io=0~3A, 350kHz
Parts No.
Value
Parts No.
Value
DA
RB225NS-40
L1
DB
RB225NS-40
CVO
10μ (TDK SLF series)
M1
RSJ250P10
RCO
2.2k
M2
RSJ450N04
RFBA
15.6k
100μ(16V)
RCL
13.33m
RFBB
82k
REN
150k
RFBC
330
RRT
33k
ROVA
15.6k
RPGD
47k
ROVB
82k
CVDD
1μ (10V)
CCOA
0.015μ (10V)
0.1μ (50V)
CCOB
100p (10V)
CVCCA
2.2μ (50V)
CFB
680p (10V)
CVCCB
220μ (50V)
CVREG3
0.47μ (10V)
CVREG5
0.47μ (10V)
CSS
0.047μ (10V)
CVL
Directions for pattern layout of PCB
1) Design the wirings shown by heavy lines as short as possible.
2) Place the input ceramic capacitor CVCCA, CVCCB as close to the M1 as possible.
3) Place the RRT as close to the GND pin as possible.
4) Place the RFBA and RFBB as close to the FB pin as possible and provide the shortest wiring from the FB pin.
5) Place the ROVA and ROVB as close to the OVPLVL pin as possible and provide the shortest wiring from the OVPLVL pin.
6) Place the RFBA, RFBB, ROVA, and ROVB as far away from the L as possible.
7) Separate power GND and signal GND so that SW noise doesn’t affect the signal GND.
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Datasheet
BD9035AEFV-C
The control of automatic buck-boost system
The following shows the switching state of three control modes.
(1) Buck mode (VCC>>Vo)
In case the input voltage is high compared to the output voltage, the chip
will go into buck mode, resulting OUTH to repeatedly switch between H
and L and that the OUTL will go to L (=OFF). This operation is the same as
that of standard step-down switching regulators.
Below, the OUTH and OUTL waveforms are shown.
VCC × Dpon = Vo
(eq.1)
OUTH
switching
OUTL
L
IL
Figure 19.
(2) Buck-Boost mode (VCC≒Vo)
In case the input voltage is close to the output voltage, the chip will go into buck-boost mode, resulting both the OUTH and
OUTL to repeatedly switch between H and L. Concerning the OUTH, OUTL timing, the chip internally controls where the
following sequence is upheld; when OUTH: H Æ L, OUTL: H Æ L.
Shown below are the OUTH and OUTL waveforms.
①
②
VCC > Vo
VCC < Vo
OUTH
switching
OUTH
switching
OUTL
switching
OUTL
switching
IL
IL
Figure 20.
Figure 21.
※The timing excludes the SW delay
The relationship between ON duty of PMOS (Dpon), ON duty of NMOS (Dnon), VCC and Vo is shown in the following
equation.
VCC × Dpon / (1-Dnon) = Vo
(eq.2)
The formula for calculation of Dpon and Dnon are shown in P.15.
(3) Boost mode (VCC<<Vo)
In case the input voltage is low compared to the output voltage, the chip
will go into boost mode, resulting OUTH to go to L (=ON) and OUTL will
repeatedly switch between H and L. This operation is the same as that of
standard step-up switching regulators.
Below, the OUTH and OUTL waveforms are shown
Vo × (1-Dnon) = VCC
(eq.3)
Figure 22.
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Datasheet
BD9035AEFV-C
(4) Mode transfer voltage and duty control
Vo, the gain of the inverting amplifier and the cross duty determines the transfer voltage at buck to buck-boost mode and
buck-boost to boost mode. The general description is shown below.
The duty of OUTH is controlled by output of error amp (COMP) and SLOPE voltage.
Also, OUTL duty is controlled by the output voltage of the inverting amplifier in chip (BOOSTCOMP) and SLOPE voltage.
In case VCC = Vo, because COMP voltage becomes equal to BOOSTCOMP voltage, OUTH and OUTL switch
simultaneously.
VCC=Vo
(Typ.)
COMP
100%
Cross duty
85%(Typ.)
SLOPE
0%
BOOSTCOMP
Buck
Buck-Boost
Boost
Figure 23. Buck-Boost operation controlled by COMP, BOOSTCOMP and SLOPE voltage
ON duty of PMOS in this condition is called the cross duty (Dx = 0.85, Typ.). Dpon and Dnon can be calculated by the
following equation, assuming the gain of the inverting amplifier as A (1.5, Typ.).
Dnon = 1 – Dx + A (Dpon – Dx)
Dnon = 1.5Dpon – 1.125
(※)
(eq.4)
From eq.3, eq.4 and Dpon=1, the input voltage at transition between buck-boost and boost mode is calculated by following;
VCC = {Dx – A (1 – Dx)} Vo
VCC = 0.625×Vo
(※)
Also, from eq.1, eq.4 and Dnon=1, the input voltage at transition between buck-boost and buck mode is calculated by
following;
VCC = Vo×A / {(1 + A)Dx – 1}
VCC = 1.333×Vo
(※)
※in case of A=1.5(Typ.) and Dx=0.85(Typ.)
88
87
ク ロス duty [%]
86
Cross duty [%]
Be sure to confirm Dx and A values under the actual application because
these parameters vary depending on conditions of use and parts.
Dx varies with oscillating frequency shown in Fig.24.
In addition, ‘A’ value can be calculated by Δdnon/Δdpon.
85
84
83
PMOS: RSD080P05
NMOS: RSD150N06
82
81
0
100 200 300 400 500 600 700 800
発振周波数
Frequency[kHz]
[kHz]
Figure 24. Cross duty vs. frequency
characteristics
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Datasheet
BD9035AEFV-C
Selection of Components Externally Connected
(1)Setting the output L value
The coil value significantly influences the output ripple current. Thus, as seen in bellow, the larger the coil, and the higher
the switching frequency, the lower the drop in ripple current. The optimal output ripple current setting is 30% of maximum
current.
Buck mode
Buck-Boost mode
VCC > Vo
Boost mode
VCC < Vo
_
ΔIL:ripple current, I L:average coil current, f:oscillating frequency
Dpon:PMOS ON duty = Vo×Dx (1+A) / (VCC+A×Vo)
=2.13×Vo / (Vcc+1.5×Vo) (Typ.)
Dnoff:NMOS ON duty = (1+A)×Dx – A×Dpon
=2.13 – 1.5×Dpon (Typ.)
An output current in excess of the coil current rating will cause magnetic saturation to the coil and decrease efficiency.
The following equation shows the peak current ILMAX assuming the efficiency as η.
It is recommended to provide a sufficient margin to ensure that the peak current does not exceed the coil current rating.
Ι LMAX =
ΔΙ ⎞
1⎛
⎜ ΙL + L ⎟
η⎝
2 ⎠
Use low resistance (DCR, ACR) coils to minimize coil loss and increase efficiency.
(2)Setting the output Co value
Select output capacitor with consideration to the ripple voltage (ΔVp-p) tolerance. The following equation is used to
determine the output ripple voltage.
Buck mode
Boost mode
The output Co setting needs to be kept within the allowable ripple voltage range.
Allow for a sufficient voltage output margin in establishing the capacitor rating. Low ESR capacitors provide a lower output
ripple voltage. Because the output startup time needs to be set within the soft start time, please take the conditions
described in the flowing equation also in consideration when selecting the value of the output capacitor.
TSS × (Ilimit – Io)
TSS:Soft start time
Co ≦
Vo
Ilimit:Over current detection value
N.B. Non-optimal capacitance values may cause startup problems. Especially in cases of extremely large capacitance
values, the possibility exists that the inrush current at startup will activate the overcurrent protection, thus not starting the
output. Therefore, verification and conformation with the actual application is recommended.
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(3)Setting the input capacitor (Cin)
The input capacitor serves to lower the output impedance of the power source
connected to the input pin (VCC, VCCCL).
Increased power supply output impedance can cause input voltage (VCC)
instability and may negatively impact oscillation and ripple rejection
characteristics. Therefore, it is necessary to place the input capacitor in close
proximity to the MOSFET and PGND pin.
Select a low-ESR capacitor with little change in capacitance due to
temperature change and with a sufficiently large ripple current.
The ripple current IRMS is determined by the following equation:
VCC
Cin
L
Vo
Co
Vo(VCC - Vo)
VCC
IRMS = Io ×
[A]
Figure 25.
Also, be certain to ascertain the operating temperature, load range and
MOSFET conditions for the application in which the capacitor will be used,
since capacitor performance is heavily dependent on the application’s input
power characteristics, substrate wiring and MOSFET gate drain capacity.
(4)Setting the output voltage
The output voltage is determined by the equation below. Select a combination of R1 and R2 to obtain the required voltage.
Note that a small resistance value leads to a drop in power efficiency and that a large resistance value leads, due to the error
amp output drain current to an increase of the offset voltage.
Vo
Vo = 0.8×
0.8V
RFBA + RFBB
RFBB
RFBA
FB
RFBA
Figure 26.
(5)Setting the oscillation frequency
The internal oscillation frequency setting is possible with the corresponding value of resistor connected to RT pin.
The setting range is 100kHz to 600kHz. The correlation between the resistance value and the oscillation frequency is shown
in the table below.
Settings outside of this range can lead to a switching stop and consequentially operations cannot be guaranteed.
700
600
RT resistance
18.7kΩ
20kΩ
22.5 kΩ
24kΩ
27kΩ
28.5kΩ
30kΩ
33kΩ
47kΩ
62kΩ
91kΩ
120kΩ
FREQUENCY:f[kHz]
500
400
300
200
100
Oscillation frequency
600kHz
550kHz
500kHz
470kHz
424kHz
400kHz
384kHz
350kHz
250kHz
192kHz
133kHz
100kHz
0
0
20
40
60
80
100
120
140
RT RESITANCE :RRT[kΩ]
Figure 27. RT resistance vs. oscillation frequency
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Datasheet
eet
BD
D9035AEF
FV-C
(6)Setting the so
oft start time
The soft start function is necessary
n
to prevent
p
inrush of coil currentt and output vo
oltage overshooot at startup. The figure be
elow
elation betwee
en soft start de
elay time and capacitance, which can be calculated byy using the equ
uation to the right
shows the re
of the figure
e.
Figure 29. Soft start tim
me TSS
TSS =
8 [V] (Typ.) × C
CSS [μF]
0.8
[sec]
S [μA] (Typ.:110μA)
ISS
F
Figure 28. Sofft Start capacitance vs. dela
ay time
Capacitance
e values betw
ween 0.01μF and
a 0.1μF are recommende
ed. There is a possibility thaat an overshoo
ot is generated in
the output d
due to the ph
hase constantt, output capa
acitance, etc. Therefore, verification andd confirmation
n with the acctual
application iis recommend
ded. Use high
h accuracy co
omponents (e.g. x5R) when
n implementingg sequential startups
s
involvving
other powerr sources.
(7)MOSFET sele
ection
•
PchMOS used for step-down
s
FET
T
ating > VCC
o VDSS maximum ra
o VGSS maximum ra
ating > Lower value of 13V o
or VCC
N.B. T
The voltage be
etween VCC-V
VL is kept at 10
0.3V(Typ.), 13
3V(Max.).
o Allo
owable curren
nt > Coil peak current ILMAX
N.B. A value above the overcurre
ent protection ssetting is
recom
mmended.
N.B S
Selecting a low
w ON resistanc
ce is conducivve to achieving
g
a high
h efficiency.
•
NchM
MOS used for step-up
s
FET
o VDSS maximum ra
ating > VO
o VGSS maximum ra
ating > VDD
o Allo
owable curren
nt > Coil peak current ILMAX
N.B. A value above the overcurre
ent protection ssetting is
recom
mmended.
N.B S
Selecting a low
w ON resistanc
ce is conducivve to achieving
g
a high
h efficiency.
(8)Schottky barriier diode selecction
•
Reverrse voltage VR > VCC
•
Allowa
able current > Coil peak currrent ILMAX
N.B. A value above the overcurre
ent protection ssetting is
recom
mmended.
N.B. S
Selecting a dio
ode with a low
w forward volta
age and fast
recove
ery is conduciive to achievin
ng a high efficiiency.
Figure 30
0
VC
CC
Vo
VR
Figure 31
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Z22111・15・0
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Datasheet
BD9035AEFV-C
(9) Setting the phase compensation
The phase compensation is set by the capacitors and resistors connected in parallel to COMP and FB pin, and RFBB. At first,
it is easier to achieve stability at any power supply and load condition by adjusting values at the lowest voltage power supply
and maximum load. Non-optimum values can cause unstable output, like oscillation.
Assuming RFBB>>RFBC and CCOA>>CCOB, each phase compensation elements make phase delay fp1and fp2, phase
lead fz1 and fz2, which can be determined by the formulas below.
fp1 =
1
2π×CFB×RFBC
fp2 =
1
2π×CCOB×RCO
fz1 =
1
2π×CFB×RFBB
fz2 =
1
2π×CCOA×RCO
This setting is obtained by using a simplified calculation; therefore, adjustment on the actual application may be required.
Also as these characteristics are influenced by the substrate layout, load conditions, etc., verification and confirmation with
the actual application at time of mass production design is recommended.
(10)Switching pulse jitter and split
Depending on the type of external FET and diode there may be jitter and
split in the switching pulse. In case this jitter and split becomes a problem
please use the following countermeasures.
• Add a resistor to the OUTH gate of the step-down FET.
• Add a resistor to the OUTL gate of the step-up FET.
However, as these characteristics are influenced by the substrate pattern,
used FET, etc., verification and confirmation with the
actual application is recommended.
VCC
VcccL
CL
OUTH
Vo
OUTL
Figure 32.
(11)Measurement of the open loop of the DC/DC converter
To measure the open loop of the DC/DC converter, use the gain phase analyzer or FRA to measure the frequency
characteristics.
VO
DC/DC converter
controller
++
①
②
①
<Procedure>
1. Check to ensure output causes no oscillation at the maximum
load in closed loop.
2. Isolate ① and ② and insert Vm (with amplitude of
approximately. 100mVpp).
3. Measure (probe) the oscillation of ① to that of ②.
RL
②
Vm
Figure 33.
Thermal derating characteristics
70mm×70mm×1.6mm, occupied copper foil is less than 3%, glass
epoxy substrate, the board and the back exposure heat radiation board
part of package are connected with solder.
HTSSOP-B24
POWER DISSIPATION: Pd [W]
4.5
④4.00W
4.0
3.5
①1 layer board (copper foil 0mm × 0mm)
θja=113.6℃/W
②2 layer board (copper foil 15mm × 15mm)
θja=73.5℃/W
③2 layer board (copper foil 70mm × 70mm)
θja=44.6℃/W
④4 layer board (copper foil 70mm × 70mm)
θja=31.3℃/W
③2.80W
3.0
2.5
2.0
②1.70W
1.5
①1.10W
1.0
0.5
0.0
0
25
50
75 100 125 150
A MBIENT TEMPERA TURE : Ta[℃ ]
175
CAUTION: Pd depends on number of the PCB layer and area.
This value is measurement value, but not guaranteed value.
Figure 34. Thermal derating characteristics
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Datasheet
BD9035AEFV-C
I/O equivalence circuits
VDD
VCC
OUTL
EN
PGND
GND
GND
VREG3
VREG3
COMP
FB
10k
1.5p
VCC
VREG3
VCCCL
RT
CL
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Datasheet
BD9035AEFV-C
Operational Notes
1) Absolute maximum ratings
Exceeding the absolute maximum rating for supply voltage, operating temperature or other parameters can result in
damages to or destruction of the chip. In this event it also becomes impossible to determine the cause of the damage
(e.g. short circuit, open circuit, etc.). Therefore, if any special mode is being considered with values expected to exceed
the absolute maximum ratings, implementing physical safety measures, such as adding fuses, should be considered.
2)
GND electric potential
Keep the GND terminal potential at the lowest (minimum) potential under any operating condition.
3)
Thermal design
Use a thermal design that allows for a sufficient margin with regard to the power dissipation of the actual operating
situation.
4)
Inter-pin shorting and mounting errors
Ensure that when mounting the IC on the PCB the direction and position are correct. Incorrect mounting may result in
damaging the IC. Also, shorts caused by dust entering between the output, input and GND pin may result in damaging
the IC.
5)
Operation in strong electromagnetic fields
Use caution when operating in the presence of strong electromagnetic fields, as this may cause the IC to malfunction.
6)
Common impedance
With regard to the wiring of the power supply and of the ground, take sufficient care to decrease the common impedance
and to make the ripple as small as possible (by making the wiring as wide and short as possible, reducing ripple by L, C,
etc.).
7)
Thermal shutdown (TSD)
Temperature Protect Circuit (TSD Circuit) is built-in in this IC. As for the Temperature Protect Circuit (TSD Circuit),
because it a circuit that aims to block the IC from insistent careless runs, it is not aimed for protection and guarantee of
IC. Therefore, please do not assume the continuing use after operation of this circuit and the Temperature Protect
Circuit operation.
8)
Rush current at power ON
With CMOS Ics and Ics featuring multiple power supplies the possibility exists of an instantaneous current rush when
the power is turned ON. Therefore, attention should be given to the power coupling capacitance and power and ground
wiring width and route.
9)
Power input at shutdown
If VCC starts up rapidly at shutdown (EN=OFF), VREG3 voltage may be output and this may cause the IC to
malfunction. Therefore, set the rise time of VCC to under 40V/ms.
10) About IC Pin Input
This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them
isolated. P-N junctions are formed at the intersection of these P layers with the N layers of other elements, creating a
parasitic diode or transistor. Relations between each potential may form as shown in the example below, where a
resistor and transistor are connected to a pin:
z With the resistor, when GND> Pin A, and with the transistor (NPN), when GND>Pin B:
The P-N junction operates as a parasitic diode.
z With the transistor (NPN), when GND> Pin B:
The P-N junction operates as a parasitic transistor by interacting with the N layers of elements in proximity to the
parasitic diode described above.
Parasitic diodes inevitably occur in the structure of the IC. Their operation can result in mutual interference between
circuits and can cause malfunctions and, in turn, physical damage to or destruction of the chip. Therefore do not employ
any method in which parasitic diodes can operate such as applying a voltage to an input pin that is lower than the (P
substrate) GND
Resistor
Transistor (NPN)
(Pin A)
(Pin B)
B
C
E
(Pin B)
(Pin A)
P
N
P
P
+
P
+
N
P
N
Parasitic element
P
+
P
N
B
+
N
P-Substrate
GND
C
Parasitic element
E
GND
Parasitic element
GND
Parasitic element
Figure 35.
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Datasheet
BD9035AEFV-C
11) About TEST pin
Note that the TEST pin will go into test mode that masks protection functions when supplied with voltage. Be sure to
connect TEST pin to ground.
12) About VREG3, VREG5 pin
VREG3 and VREG5 output pins are designed to supply power only into this IC. Thus, it is not recommended to use
them for other purposes.
Ordering Information
B
D
9
0
3
5
A
Parts Number
E
F
V
Package
EFV: HTSSOP-B24
-
C E2
Product Rank
C: for Automotive
Packaging specification
E2: Embossed tape and reel
Marking Diagram
HTSSOP-B24 (TOP VIEW)
Part Number Marking
BD9035A
LOT Number
1PIN MARK
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Datashe
Datasheet
eet
BD
D9035AEF
FV-C
Physical Dimen
nsion, Tape an
nd Reel Inforrmation
Package
P
Na
ame
HT
TSSOP-B24
4
<Ta
Tape and Reell information>
in
T
Tape
Emb
bossed carrier tape
pe (with dry pack))
Q
Quantity
2000
00pcs
Direction
D
of
o feed
E2
The
he direction is the 1pin
1p of product is att the
t upper left when
en you hold
( ree
a you pull out the
hand
eel on the left hand and
he tape on the rightt h
Direction
n of
o feed
1pin
Ree
eel
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Z22111・15・0
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)
rder quantity needs to be
b multiple of the minimum
min
quantity.
∗ Orde
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Datasheet
BD9035AEFV-C
Revision History
Date
Revision
Change log
2013.7.30
001
New version created.
2014.2.19
002
Added the term about AEC-Q100. (P.1)
Replaced “Physical Dimension, Tape and Reel Information” with new format. (P.22)
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Notice
Precaution on using ROHM Products
1.
If you intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1),
aircraft/spacecraft, nuclear power controllers, etc.) and whose malfunction or failure may cause loss of human life,
bodily injury or serious damage to property (“Specific Applications”), please consult with the ROHM sales
representative in advance. Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any
ROHM’s Products for Specific Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN
USA
EU
CHINA
CLASSⅢ
CLASSⅡb
CLASSⅢ
CLASSⅢ
CLASSⅣ
CLASSⅢ
2.
ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor
products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which
a failure or malfunction of our Products may cause. The following are examples of safety measures:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure
3.
Our Products are not designed under any special or extraordinary environments or conditions, as exemplified below.
Accordingly, ROHM shall not be in any way responsible or liable for any damages, expenses or losses arising from the
use of any ROHM’s Products under any special or extraordinary environments or conditions. If you intend to use our
Products under any special or extraordinary environments or conditions (as exemplified below), your independent
verification and confirmation of product performance, reliability, etc, prior to use, must be necessary:
[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents
[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust
[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,
H2S, NH3, SO2, and NO2
[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves
[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items
[f] Sealing or coating our Products with resin or other coating materials
[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of
flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning
residue after soldering
[h] Use of the Products in places subject to dew condensation
4.
The Products are not subject to radiation-proof design.
5.
Please verify and confirm characteristics of the final or mounted products in using the Products.
6.
In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,
confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect
product performance and reliability.
7.
De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual
ambient temperature.
8.
Confirm that operation temperature is within the specified range described in the product specification.
9.
ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in
this document.
Precaution for Mounting / Circuit board design
1.
When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product
performance and reliability.
2.
In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must
be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products,
please consult with the ROHM representative in advance.
For details, please refer to ROHM Mounting specification
Notice-PAA-E
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Datasheet
Precautions Regarding Application Examples and External Circuits
1.
If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2.
You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1.
Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2.
Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3.
Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4.
Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
Precaution for Product Label
QR code printed on ROHM Products label is for ROHM’s internal use only.
Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.
Precaution for Foreign Exchange and Foreign Trade act
Since concerned goods might be fallen under listed items of export control prescribed by Foreign exchange and Foreign
trade act, please consult with ROHM in case of export.
Precaution Regarding Intellectual Property Rights
1.
All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data.
2.
ROHM shall not have any obligations where the claims, actions or demands arising from the combination of the
Products with other articles such as components, circuits, systems or external equipment (including software).
3.
No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the Products or the information contained in this document. Provided, however, that ROHM
will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to
manufacture or sell products containing the Products, subject to the terms and conditions herein.
Other Precaution
1.
This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2.
The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written
consent of ROHM.
3.
In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4.
The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
Notice-PAA-E
© 2015 ROHM Co., Ltd. All rights reserved.
Rev.001
Datasheet
General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.
ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny
ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s
representative.
3.
The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all
information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or
liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or
concerning such information.
Notice – WE
© 2015 ROHM Co., Ltd. All rights reserved.
Rev.001
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