1/4
STRUCTURE
Silicon Monolithic Integrated Circuit
TYPE
PRODUCT SERIES
FEATURES
Step-down Switching Regulator Integrated High Side Switch
BD9070FP
・
Integrated FET 1ch Step-down Switching Regulato
r
・1ch
High Side Switch
・Over
Voltage Protection which can be Variable by External Resisters
・Over
Current Protection for Switching Regulator
・Over
Current Protection for High Side Switch
・Thermal
Shut Down Circuit
・Under
Voltage Lock Out Circuit
・Over
Current Detection Flag pin for High Side Switch
◎
ABSOLUTE MAXIMUM RATINGS（Ta＝25℃）
）
Parameter
Supply Voltage
SW Pin Voltage
Output SW Current
EN, SYNC Pin Voltage
RT, FB, INV Pin Voltage
VDD Input Voltage
HSDSW Control Voltage
HSDSW Flag Voltage
Over Voltage Protection Detection Terminal
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
Symbol
V
IN
V
SW
I
SW
V
EN
/
SYNC
V
RT
, V
FB
, V
INV
V
DD
HSDCTL
HSDFLG
OVPDET
Pd
Topr
Tstg
Tjmax
Limits
36
V
IN
2.1
（
1
）
V
IN
7
15
V
DD
6
6
1.45
（
2
）
-40½+105
-55½+150
150
Unit
V
V
A
V
V
V
V
V
V
W
℃
℃
℃
（1）However
,do not exceed Pd.
（2）Pd
derated at 5.52mW/℃ for temperature above Ta=25℃, Mounted on a double layer PCB 70mm×70mm×1.6mm.
(with Thermal vias / Copper area：70mm×70mm)
◎
OPERATING CONDITIONS
（However、it
does not guarantee the electric characteristic
.
）
Parameter
Recommend Supply Voltage
Recommend Supply Voltage
2
High Side Switch Current
Output Switch Current
Oscillator Frequency
External Synchronous
Frequency
（3）
However, do not exceed OSC×1.5.
＊The
product is not designed for protection against radioactive rays
Symbol
V
IN
V
DD
I
HSW
I
SW
F
OSC
F
SYNC
Min.
7
2.7
-
-
50
F
OSC
Max.
35
5.5
0.7
2
500
500
（
3
）
Unit
Ｖ
V
A
A
kHz
kHz
REV. A
2/4
◎
ELECTRICAL CHARACTERISTICS
(
Unless otherwise specified Ta=25℃,V
IN
=13.2V,V
EN
=5V,V
DD
=5V,HSDCTL=5V
)
Parameter
［Entire
Device½
Stand-by Current
Operation Current
［Switch½
Leakage Current
［DC/DC½
Reference Voltage1
Reference Voltage2
Input Bias Current
Switching Frequency1
Switching Frequency2
Synchronous Frequency
Over Current Protection Operation
Output Current
Output ON Voltage
Output OFF Voltage
Sink Current
Over Voltage Detection Voltage
Over Voltage Hysteresis Voltage
［High
Side Switch½
［DC
Characteristic½
ON Resistance
Leakage Current
Over Current Limit Threshold Level
FLG Output Resistance
FLG Output Leakage Current
［Control
Terminal½
HSD CTL Input Voltage H
HSD CTL Input Voltage L
HSD CTL Input Current
［AC
Characteristic½
Output Rise Time
Output Turn On Delay Time
Output Fall Time
Output Turn Off Delay Time
Over Current Blanking Time
Symbol
Min.
-
-
-
0.784
0.784
-1
240
238.5
495
2.1
2.6
-
-
0.95
-
Limits
Typ.
0
4.3
0
0.800
0.800
-
300
300
500
4
-
-
35
1.00
50
Max.
10
9
30
0.816
0.816
-
360
361.5
505
-
-
0.8
90
1.05
-
Unit
Condition
I
STB
Io
Io
LEAK
V
REF
1
V
REF
2
I
B
F
OSC
1
F
OSC
2
F
SYNC
I
OLIMIT
V
ENON
V
ENOFF
I
EN
V
OVP
V
OVP HYS
uA
mA
uA
V
V
uA
kHz
kHz
kHz
A
V
V
uA
V
mV
V
EN
= 0V
Io=0A,RT=51kΩ,INV=0.7V
V
IN
=35V,V
EN
=0V
V
FB
=V
INV
V
IN
=10½16V,V
FB
=V
INV
V
INV
=0.6V
RT=51kΩ
V
IN
=10½16V,RT=51kΩ
RT=51kΩ,EN/SYNC=500kHz,
Duty=50%
V
EN
=5V
R
ON
I
LEAK
ITH
LIM
R
FL
IF
LL
CTLH
CTLL
ICTL
T
ON
1
T
ON
2
T
OFF
1
T
OFF
2
T
BLANK
-
-
0.7
-
-
2.0
-
-1.0
-
-
-
-
6
110
0
1.0
305
0
-
-
0.01
0.8
1.1
2.7
19
8
T
ON
/ T
OFF
time
150
10
1.3
450
1
VDD
0.8
1.0
6
10
20
40
10
mΩ
uA
A
Ω
uA
V
V
uA
ms
ms
us
us
ms
Io=10mA
HSDCTL=0V
IFL=1mA
VFLG=5V
HSD CTL=0V or 5V
R
L
=20Ω
R
L
=20Ω
R
L
=20Ω
R
L
=20Ω
R
T
=51kΩ,EN/SYNC=400kHz
REV. A
3/4
◎
BLOCK DIAGRAM
◎
PHYSICAL DIMENTIONS・MARKING
BATT
CIN3
VIN
EN/SYNC
VREG
RT
RT
SYN
C
VRE
G
VRE
F
VRE
G
VREG
UVL
O
TSD
OVP
UVLOOVP OVP
TSD
VRE
G
VRE
G
VRE
G
品番
PVIN
CB
DRV
VREGB
SW
PVI
N
VREG
PVI
N
OSC
VRE
G
INV
R3
C3
C1
FB
ER
R
S
VRE
G
BATT
CIN2 CIN1
BD9070FP
SLOP
E
DRV
LOGIC
R
PW
M
VREG
L1
C0
R1
R2
R4
C2
Lo No.
R5
R6
SOFT
START
UVLO,TSD
OVP,OCP,SC
P
SCP
VREG
OCP
OCP
VDD
SCP
VDD
VDD
HSD
CTL
GN
D
PGND
UVLO
TSD
HSD
UVLO
Control
Logic
Charge
Pump
VDD
VREG
HSDSW
HSDSW
HSD
UVLO
OCD
HSD
UVLO
HSOP25
（Unit：mm）
FL
G
◎
Pin No.・Pin Name
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
Pin Name
VREGB
V
IN
N.C.
N.C.
PGND
GND
RT
EN/SYNC
HSDCTL
FLG
N.C.
HSDSW
HSDSW
Function
FET Driver Drive Power Supply Pin
Input Power Supply Pin
Non-Connect (unused) Pin
Non-Connect (unused) Pin
Ground Pin
Ground Pin
Switching Frequency Setting Pin
DC/DC ON/OFF Pin
External Synchronous Pulse Input Pin
High Side Switch ON/OFF Pin
High Side Switch Over Current Flag Pin
Non-Connect (unused) Pin
High Side Switch Output Pin
High Side Switch Output Pin
Pin
No.
14
15
16
17
18
19
20
21
22
23
24
25
Pin
Name
N.C.
VDD
VDD
OVP
INV
FB
N.C.
SW
SW
N.C.
PV
IN
PV
IN
Function
Non-connect (unused) pin
High Side Switch Input Pin
High Side Switch Input Pin
Over Voltage Protection Detection Pin
Error Amp Input Pin
Error Amp Output Pin
Non-connect (unused) pin
DC/DC Output Pin
DC/DC Output Pin
Non-connect (unused) pin
Input power supply pin
Input power supply pin
※Refer
to the Technical Note about the details of the application.
REV. A
4/4
NOTES FOR USE
1．Absolute maximum range
Absolute Maximum Ratings are those values beyond which the life of a device may be destroyed we cannot be defined the failure mode, such
as short mode or open mode.
Therefore physical security countermeasure, like fuse, is to be given when a specific mode to be beyond absolute maximum ratings is
considered.
2．Operation supply voltage range
The circuit functionality is guaranteed within operation of ambient temperature range, as long as it is within operation supply voltage range. The
standard electrical characteristic values are guaranteed at the test circuit voltage of VIN=13.2V. They cannot be guaranteed at other voltages in
the operating range of 7V-35V. However, the variation will be small.
3．Grounding
It is recommended that every capacitor (bypass and another capacitors) is grounded to the ground pin using single-point connections.
4．Input supply voltage
Input supply pattern layout should be as short as possible.
5．VIN Terminal
For reduce the influence of switching noise, bypass capacitor is connected between VIN and GND. (over 2μF)
6. SOFT START
The SOFT START block provides a function to prevent from 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 to 5 msec (typ.).
7．FB Terminal
The FB terminal is for phase margin of the DC/DC system. A capacitor and a resistor or an only capacitor placed between the FB terminal and the INV
terminal. The values of the capacitor and the resistor shall be adjusted according to the output current and the output capacitor value. The output may
be oscillating if the value of capacitor is not sufficient, also the transient response may become insufficient if the value is too large. Therefore, the value
of the capacitor and the resistor shall be adequately set up based on the condition of the temperature, and so on. Since the FB terminal also detects
output short condition compulsorily applying an external voltage onto the FB terminal must not be performed because it may activate the timer latch
protection circuit.
8．Electromagnetic Fields
The IC is susceptible to strong electromagnetic fields and may cause malfunction. Therefore, caution should be used when placing it on the PCB.
9．Adjacent Pin short mistake fitting
Use caution when orienting and positioning the IC for mounting on printed circuit boards. Improper mounting may result in damage to the IC.
10．Application Design
When designing the external circuit, chose parts in condition of the enough margin that not only steady state but also transient characteristics contain.
11．Over Output Current Protection
It is recommend not to use that continuously operates the protection circuit (For instance, always the load that greatly exceeds the output current
ability is connected or the output is short-circuited, etc.) in these protection circuits by an effective one to the destruction prevention due to broken
accident.
12. Short Circuit Protection (SCP)
The short circuit protection operates when the output falls on 70% or less after the over current protection operates. When the short-circuit protection
operates, the output voltage is turned off, and the average output current is limited between 1024 pulses of the sending frequency. When the input is
turned on, this protection is off before setting voltage.
13．Temperature protection (thermal down) circuit
This IC has a built-in temperature protection circuit to prevent from the thermal destruction of the IC. As described above, be sure to use this IC within
the power dissipation range. Should a condition exceeding the power dissipation range continue, the chip temperature Tj will rise to activate the
temperature protection circuit, thus turning OFF the output power element. Then, when the tip temperature Tj falls, the circuit will be automatically
reset. Furthermore, if the temperature protection circuit is activated under the condition exceeding the Maximum Junction Temperature, do not attempt
to use the temperature protection circuit for set design.
REV. A
TI Technology Forum
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