Datasheet
Input Voltage 3.5 V to 36 V
Output SW Current 4 A / 2.5A / 1.25A
1ch Step-Down Switching Regulator
BD906xx-C series
Key Specifications
General Description
Input Voltage Range :
3.5 V to 36 V
(Initial startup is over 3.9 V)
Output Voltage Range :
0.8 V to VIN
Output Switch Current :
4 A / 2.5 A / 1.25 A (Max)
Switching Frequency :
50 kHz to 600 kHz
Reference Voltage Accuracy :±2% (-40 °C to +125 °C)
Shutdown Circuit Current :
0 µA (Typ)
Operating Temperature Range(Ta) : -40 °C to +125 °C
BD906xx-C series is a step-down switching regulator
with integrated POWER MOS FET and have the
capability to withstand high input voltage, providing a free
setting function of operating switching frequency with
external resistor. This switching regulator features a wide
input voltage range (3.5 V to 36 V, Absolute maximum 42
V) and operating temperature range (-40 °C to +125 °C).
Furthermore, an external synchronization input pin
enables synchronous operation with external clock.
Package
Features
W(Typ) x D(Typ) x H(Max)
9.395mm x 10.540mm x 2.005mm
4.90mm x 6.00mm x 1.00mm
HRP7
HTSOP-J8
(Note 1)
AEC-Q100 Qualified
Integrated Pch POWER MOS FET
Low Dropout: 100 % ON Duty Cycle
External Synchronization Function
Soft Start Function: 1.38 ms (fSW = 500 kHz)
Current Mode Control
Over Current Protection
Low Supply Voltage Error Prevention
Thermal Shut Down Protection
Short Circuit Protection
High power HRP7 package mounted
Compact and High power HTSOP-J8 package
mounted
Load dump up to 42 V.
(Note 1 : Grade 1)
HRP7
HTSOP-J8
Applications
Automotive Battery Powered Supplies
(Cluster Panels, Car Multimedia)
Industrial / Consumer Supplies
Other electronic equipment
Typical Application Circuit
L1
PVIN
SW
VO
D1
VIN
CO R1
C2
VIN
Cbulk
CIN
FB
RT
VEN / SYNC
CRT
RRT
EN / SYNC
GND
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
CVTSZ22111・14・001
R2
VC
R3
C1
○This product has no designed protection against radioactive rays
1/40
TSZ02201-0T1T0AL00130-1-2
15.Sep.2015 Rev.005
BD906xx-C series
Lineup
Product
Name
HRP7
BD90640HFP-C
BD90620HFP-C
-
HTSOP-J8
BD90640EFJ-C
BD90620EFJ-C
BD90610EFJ-C
4A
2.5 A
1.25 A
Output Switch Current
Input Maximum Ratings
Input Voltage Range
42 V
(Note 1)
3.5 V to 36 V
0.16 Ω (Typ)
POWER MOSFET ON Resistance
Power
Dissipation
HRP7
(Note 2)
HTSOP-J8
6.98 W
(Note 3)
3.10 W
(Note 1) Initial startup is over 3.9 V
(Note 2) Reduce by 55.8 mW / °C (Above 25°C),
(JESD51 -5 / -7 standard FR4 114.3 mm × 76.2 mm × 1.60 mmt 4-layer Top copper foil: ROHM recommended footprint + wiring to measure /
2,3 inner layers and Copper foil area on the reverse side of PCB 74.2 mm × 74.2 mm, copper (top & reverse side / inner layers) 70 μm / 35 μm.
Thermal via : pitch 1.2 mm, diameter Φ0.30 mm )
(Note 3) Reduce by 24.8 mW / °C (Above 25°C),
(JESD51 -5 / -7 standard FR4 114.3 mm × 76.2 mm × 1.60 mmt 4-layer Top copper foil: ROHM recommended footprint + wiring to measure /
2,3 inner layers and Copper foil area on the reverse side of PCB 74.2 mm × 74.2 mm, copper (top & reverse side / inner layers) 70 μm / 35 μm.
Thermal via : pitch 1.2 mm, diameter Φ0.30 mm)
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
2/40
TSZ02201-0T1T0AL00130-1-2
15.Sep.2015 Rev.005
BD906xx-C series
Pin Configuration
(TOP VIEW)
(TOP VIEW)
1. VC
2. VIN
3. FB
4. GND
1. RT
8. FB
2. SW
7. PVIN
3. EN / SYNC
6. VIN
4. GND
5. VC
FIN
5. RT
6. SW
7. EN / SYNC
HRP7
HTSOP-J8
Pin Description
Pin No.
Symbol
Function
Pin No
Symbol
Function
1
VC
Error Amp Output
1
RT
Switching Frequency Setting
Resistor Connection
2
VIN
Power Supply Input
2
SW
Switching Output
3
FB
Output Voltage Feedback
3
EN / SYNC
Enable /
External Clock Input
4
GND
GND
4
GND
GND
RT
Switching Frequency Setting
Resistor Connection
5
VC
Error Amp Output
5
6
SW
Switching Output
7
EN / SYNC
Enable /
External Clock Input
FIN
-
GND
6
(Note 1)
VIN
7
PVIN
8
Power Supply Input
(Note 1)
Power Supply Input
FB
Output Voltage Feedback
(Note 1) VIN and PVIN must be shorted.
HRP7
HTSOP-J8
Block Diagram
PVIN
7
UVLO
VIN
VREF
VREG
OCP
6
VREF
3
EN / SYNC
SCP_
LATCH
Current
Sense
∑
SLOPE
OCP
OCP
TSD
ERROR_AMP
+
-
+
+
SOFT_
START
VC
Q
R
DRV
Pch POWER
MOSFET
FB
8
SW
EN
UVLO
TSD
OCP
SCP_LATCH
OFF
RT
OSC
0.8V
GND
4
TSD
CUR
_COMP
+
-
+
+
SOFT_
START
5
HRP7
VC
PWM_LATCH
S
Q
R
DRV
Pch POWER
MOSFET
SW
EN
UVLO
TSD
OCP
SCP_LATCH
OFF
GND
HTSOP-J8
3/40
1
TSD
ERROR_AMP
6
1
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
SLOPE
+
-
PWM_LATCH
S
∑
SCP
0.55V
CUR
_COMP
Current
Sense
OCP
TSD
+
0.55V
SCP_LATCH
SCP_
LATCH
5
OCP
0.8V
EN / SYNC
RT
OSC
SCP
FB
VREG
EN / SYNC
SCP_LATCH
3
UVLO
OCP
EN / SYNC
7
UVLO
VIN
UVLO
2
TSZ02201-0T1T0AL00130-1-2
15.Sep.2015 Rev.005
2
4
BD906xx-C series
Description of Blocks
1.
ERROR_AMP
The ERROR_AMP block is an error amplifier and its inputs are the reference voltage 0.8 V (Typ) and the “FB” pin
voltage. (Refer to recommended examples on p.16 to 17). The output “VC” pin controls the switching duty, the output
voltage is set by “FB” pin with external resistors. Moreover, the external resistor and capacitor are required to COMP pin
as phase compensation circuit (Refer to phase compensation selection method on p.17 to 18).
2.
SOFT_START
The function of the SOFT_START block is to prevent the overshoot of the output voltage VO through gradually
increasing the input of the error amplifier when the power supply turns ON, which also results to the gradual increase of
the witching duty. The soft start time is set to 1.38 ms (Typ , fSW = 500 kHz).
The soft start time is changed by setting of the switching frequency. (Refer to p.18)
3.
EN / SYNC
The IC is in normal operation when the voltage on the “EN / SYNC” pin is more than 2.6 V. The IC is shut down when the
voltage on the “EN / SYNC” pin is less than 0.8 V. Furthermore, external synchronization is possible when external clock
are applied to the “EN / SYNC” pin. The switching frequency range of the external synchronization is within ±20 % of the
switching frequency and is limited by the external resistance connected to the RT pin.
ex) When RRT is 27 kΩ (f = 500 kHz), the switching frequency range of the external synchronization is 400 kHz to 600
kHz.
4.
OSC (Oscillator)
This circuit generates the clock pulses that are input to SLOPE block. The switching frequency is determined by the
current going through the external resistor RT at constant voltage of ca. 0.8V. The switching frequency can be set in the
range between 50 kHz to 600 kHz (Refer to p.16 Figure 13). The output of the OSC block send clock signals to
PWM_LATCH. Moreover the generated pulses of the OSC block are also used as clock of the counter of SS and
SCP_LATCH blocks.
5.
SLOPE
This block generates saw tooth waves using the clock generated by the OSC block. The generated saw tooth waves are
combined with the current sense and sent to the CUR_COMP.
6.
CUR_COMP (Current Comparator)
The CUR_COMP block compares the signals between the ERROR_AMP and the combined signals from the SLOPE
block and current sense. The output signals are sent to the PWM_LATCH block.
7.
PWM_LATCH
The PWM_LATCH block is a LATCH circuit. The OSC block output (set) and CUR_COMP block output (reset) are the
inputs of this block. The PWM_LATCH block outputs PWM signals.
8.
TSD (Thermal Shut down)
The TSD block prevents thermal destruction / thermal runaway of the IC by turning OFF the Pch POWER MOSFET
output when the temperature of the chip reaches more than about 175 °C (Typ). When the chip temperature falls to a
specified level, the switching will resume. However, since the TSD is designed to protect the IC, the chip temperature
should be provided with the thermal shutdown detection temperature of less than approximately Tjmax = 150 °C.
9.
OCP (Over Current Protection)
OCP is activated when the voltage between the drain and source (on-resistance × load current) of the Pch POWER
MOSFET when it is ON, exceeds the reference voltage which is internally set within the IC. This OCP is a self-return
type. When OCP is activated, the ON duty will be small, and the output voltage will decrease. However, this protection
circuit is only effective in preventing destruction from sudden accident. It does not support the continuous operation of
the protection circuit (e.g. if a load, which significantly exceeds the output current capacitance, is connected).
10. SCP (Short Circuit Protection) and SCP-LATCH
While OCP is activated, and if the output voltage falls below 70 %, SCP will be activated. When SCP is active, the output
will be turned OFF after a period of 1024 pulse. It extends the time that the output is OFF to reduce the average output
current. In addition, during startup of the IC, this feature is masked until it reaches a certain output voltage to prevent the
startup failure.
11. UVLO (Under Voltage Lock-Out)
UVLO is a protection circuit that prevents low voltage malfunction. It prevents malfunction of the internal circuit from
sudden rise and fall of power supply voltage. It monitors the VIN power supply voltage and the internal regulator voltage.
If VIN is less than the threshold voltage 3.24 V (Typ), the Pch POWER MOSFET output is OFF and the soft-start circuit
will be restarted. This threshold voltage and release voltage have a hysteresis of 280 mV (Typ).
12. DRV (Driver)
This circuit drives the gate electrode of the Pch POWER MOSFET output. It reduces the increase of the Pch POWER
MOSFET’s on-resistance by switching the driving voltage when the power supply voltage drop.
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
4/40
TSZ02201-0T1T0AL00130-1-2
15.Sep.2015 Rev.005
BD906xx-C series
Absolute Maximum Ratings (Ta = 25 °C)
Parameter
Symbol
Rating
Unit
Input Power Supply Voltage
VIN, PVIN
-0.3 to +42
V
EN / SYNC Pin Voltage
VEN / SYNC
-0.3 to VIN
V
RT, VC, FB Pin Voltage
VRT, VVC, VFB
-0.3 to +7
V
HRP7
Power Dissipation
(Note2)
6.98
(Note1)
Pd
HTSOP-J8
W
(Note3)
3.10
Storage Temperature Range
Maximum Junction Temperature
Tstg
-55 to +150
°C
Tjmax
150
°C
(Note 1) Do not however exceed Pd.
(Note 2) Reduce by 55.8 mW / °C, (Above 25°C),
(JESD51 -5 / -7 standard FR4 114.3 mm × 76.2 mm × 1.60 mmt 4-layer Top copper foil: ROHM recommended footprint + wiring to measure /
2,3 inner layers and Copper foil area on the reverse side of PCB 74.2 mm × 74.2 mm, copper (top & reverse side / inner layers) 70 µm / 35 µm.
Thermal via : pitch 1.2 mm, diameter Φ0.30 mm )
(Note 3) Reduce by 24.8 mW / °C, (Above 25°C),
(JESD51 -5 / -7 standard FR4 114.3 mm × 76.2 mm × 1.60 mmt 4-layer Top copper foil: ROHM recommended footprint + wiring to measure /
2,3 inner layers and Copper foil area on the reverse side of PCB 74.2 mm × 74.2 mm, copper (top & reverse side / inner layers) 70 µm / 35 µm.
Thermal via : pitch 1.2 mm, diameter Φ0.30 mm )
Caution: 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.
Recommended Operating Conditions
Parameter
Symbol
Limit
Unit
Min
Max
VIN, PVIN
3.5
36
V
Topr
-40
+125
°C
BD90640HFP/EFJ-C
ISW40
-
4
A
BD90620HFP/EFJ-C
ISW20
-
2.5
A
BD90610EFJ-C
ISW10
-
1.25
A
VO
0.8
VIN
V
Min ON Pulse Width
TON_MIN
250
-
ns
Switching Frequency
fSW
50
600
kHz
Switching Frequency Set Resistance
RRT
22
330
kΩ
Synchronous Operation Frequency Range
fSYNC
50
600
kHz
fSYNC_RT
-20
+20
%
DSYNC
10
90
%
-
µF
Operating Power Supply Voltage
(Note 1)
Operating Temperature Range
Output Switch Current
(Note2)
Output Voltage
Synchronous Operation Frequency
External Clock ON Duty
Capacitance of Input Capacitor
CIN
2.4
(Note 3)
(Note 1) Initial startup is over 3.9 V.
(Note 2) The Limits include output DC current and output ripple current.
(Note 3) Ceramic capacitor is recommended. The capacitor value including temperature change, DC bias change, and aging change must be larger than
minimum value (Refer to p.15). Also, the IC might not function properly when the PCB layout or the position of the capacitor is not good. Please check
“Notes on the PCB Layout” on page 30.
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/40
TSZ02201-0T1T0AL00130-1-2
15.Sep.2015 Rev.005
BD906xx-C series
Electrical Characteristics (Unless otherwise specified, Ta = - 40 °C to +125 °C, VIN = 13.2 V, VEN / SYNC = 5 V)
Limit
Parameter
Symbol
Unit
Conditions
Min
Typ
Max
ISDN
-
0
5
μA
VEN / SYNC = 0 V,
Ta < 105 °C
IIN
-
2.2
3.3
mA
Io = 0 A, VFB = 2 V
RON
-
0.16
0.32
Ω
BD90640HFP / EFJ-C
ISWLIMIT40
4.0
6.4
-
A
BD90620HFP / EFJ-C
ISWLIMIT20
2.5
4.3
-
A
BD90610EFJ-C
ISWLIMIT10
1.25
2.20
-
A
IOLK
-
0
5
μA
VIN = 36 V,
VEN / SYNC = 0 V,
Ta < 105 °C
Reference Voltage 1
VREF1
0.792
0.800
0.808
V
VVC = VFB, Ta = 25 °C
Reference Voltage 2
VREF2
0.784
0.800
0.816
V
VVC = VFB
Reference Voltage Input
Regulation
ΔVREF
-
0.5
-
%
3.5 V ≤ VIN ≤ 36 V
IB
-1.0
-
+1.0
μA
IVCSINK
-76.5
-54.0
-31.5
μA
VC Source Current
IVCSOURCE
31.5
54.0
76.5
μA
Trans Conductance
GEA
135
270
540
μA / V
Soft Start Time
TSS
1.13
1.38
1.63
ms
GCS
-
5.2
-
A/V
fSW
450
500
550
kHz
ΔfSW
-
1
-
%
Threshold Voltage
VEN / SYNC
0.8
1.9
2.6
V
SYNC Current
IEN / SYNC
-
23
50
μA
UVLO ON Mode Voltage
VUVLO_ON
-
3.24
3.50
V
UVLO OFF Mode Voltage
VUVLO_OFF
-
3.52
3.90
V
UVLO Hysteresis
VUVLO_HYS
-
280
-
mV
Whole chip
Shutdown Circuit Current
Circuit Current
SW Block
POWER MOSFET ON Resistance
Operating Output
Switch Current Of
Overcurrent
(Note 1)
Protection
Output Leak Current
ISW = 30 mA
Error Amp Block
Input Bias Current
VC Sink Current
VVC = 1.25 V,
VFB = 1.3 V
VVC = 1.25 V,
VFB = 0.3 V
IVC = ±10 μA,
VVC = 1.25 V
RRT = 27 kΩ
Current Sense Part
Trans Conductance
OSC Block
Switching Frequency
Frequency Input Regulation
RRT = 27 kΩ
3.5 V ≤ VIN ≤ 36 V
Enable / Sync Input Block
VEN / SYNC = 5 V
UVLO
(Note 1) The Limit include output DC current and output ripple current.
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
6/40
TSZ02201-0T1T0AL00130-1-2
15.Sep.2015 Rev.005
BD906xx-C series
4.0
4.0
3.5
3.5
3.0
From Top
Ta = 125 °C
Ta = 25 °C
Ta = -40 °C
2.5
Circuit Current :IIN [mA]
Shutdown Circuit Current : ISDN[µA]
Typical Performance Curves
2.0
1.5
1.0
0.5
3.0
2.5
2.0
1.5
From Top
Ta = 125 °C
Ta = 25 °C
Ta = -40 °C
1.0
0.5
0.0
0.0
0
5
10
15
20
25
30
Input Voltage : VIN [V]
35
40
0
Figure 1. Shutdown Circuit Current vs Input Voltage
10
15
20
25
30
Input Voltage : VIN [V]
35
40
Figure 2. Circuit Current vs Input Voltage
0.30
10
From Top
BD90640HFP / EFJ-C
BD90620HFP / EFJ-C
BD90610EFJ-C
9
0.25
Switch Current Limit : ISW [A]
POWER MOSFET ON Resistance : RON[Ω]
5
0.20
0.15
From Top
VIN = 3.5 V
VIN = 13.2 V
0.10
0.05
8
7
6
5
4
3
2
1
0.00
Ta = 25 °C
0
-40
-20
0
20 40 60 80 100 120
Ambient Temperature : Ta [˚C]
Figure 3. POWER MOSFET ON Resistance vs
Ambient Temperature
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
0
5
10
15
20
25
30
Input Voltage : VIN [V]
35
40
Figure 4. Switch Current Limit vs Input Voltage
7/40
TSZ02201-0T1T0AL00130-1-2
15.Sep.2015 Rev.005
BD906xx-C series
Typical Performance Curves – continued
5.0
816
812
Reference Voltage : VREF[V]
Leak Current : IOLK [μA]
4.0
3.0
2.0
1.0
808
804
800
796
792
788
VIN = 13.2 V
0.0
VIN = 13.2 V
784
-40
-20
0
20 40 60 80 100 120
Ambient Temperature : Ta [˚C]
-40
-20
0
20 40 60 80 100 120
Ambient Temperature : Ta[˚C]
Figure 6. Reference Voltage vs Ambient Temperature
Figure 5. Leak Current vs Ambient Temperature
1.63
1.0
1.58
1.53
Soft Start Time : TSS[μS]
Input Bias Current :IB [μA]
0.8
0.6
0.4
1.48
1.43
1.38
1.33
1.28
1.23
0.2
VIN = 13.2 V
VFB = 0.8 V
1.18
RRT = 27 kΩ
1.13
0.0
-40
-20
0
20 40 60 80 100 120
Ambient Temperature : Ta [˚C]
-20
0
20 40 60 80 100 120
Ambient Temperature : Ta[˚C]
Figure 8. Soft Start Time vs Ambient Temperature
Figure 7. Input Bias Current vs Ambient Temperature
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
-40
8/40
TSZ02201-0T1T0AL00130-1-2
15.Sep.2015 Rev.005
BD906xx-C series
Typical Performance Curves – continued
550
EN / SYNC Threshold Voltage : VEN/SYNC [V]
2.6
540
Switching Frequency : fSW [kHz]
530
520
510
500
490
480
470
VIN = 13.2 V
RRT = 27 kΩ
460
-20
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
450
-40
2.4
-40
0
20
40
60
80 100 120
Ambient Temperature : Ta[˚C]
0
20 40 60 80 100 120
Ambient Temperature : Ta [˚C]
Figure 10. EN / SYNC Threshold Voltage
vs Ambient Temperature
Figure 9. Switching Frequency vs Ambient Temperature
450
100
400
90
From Top
Ta = 125 °C
Ta = 25 °C
Ta = -40 °C
350
300
80
From Top
VO = 8.8 V
VO = 5 V
VO = 3.3 V
70
Efficiency [%]
EN / SYNC Current : IEN / SYNC [μA]
-20
250
200
150
60
50
BD90640HFP / EFJ-C IO
工商网监
湘ICP备2023018690号
