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PDF BD39012EFV-C Data sheet ( Hoja de datos )

Número de pieza BD39012EFV-C
Descripción System Regulator
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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Datasheet
Management IC for Automotive Microcontroller
System Regulator for microcontroller for
automotive
BD39012EFV-C
General Description
BD39012EFV-C is a power management IC with
1 ch DC / DC convertor, 1 ch LDO, reset and watch dog
timer. It can supply the power supply to module from
battery directly. LDO has reset built-in and always
watches that it supplies stable power supply to module.
In addition, window watch dog timer is provided to detect
the abnormality of the microcomputer. BD39012EFV-C
enables a superior heat dissipation and a compact PCB
design by HTSSOP-B24 package.
Features
Synchronous rectifier step-down DC / DC converter
with built-in FET (Adjustable output)
Secondary LDO with built-in 5 V output FET
Monitoring function
Output over voltage / under voltage detection
(PG output), Reset function (LDO)
Window Watchdog Timer
Built-in protection function
Input under voltage protection (UVLO)
Thermal shut down (TSD)
Output over current protection (OCP)
Independent enable control
HTSSOP-B24 package
Key Specifications
Input voltage range:
4 V to 45 V
(Startup voltage needs to be above 4.5V.)
Output Voltage Accuracy
Step-down DC / DC Converter FB Voltage:
0.8 V ±2 %
Secondary LDO:
5.0 V ±2 %
Output Maximum Current
Step-down DC / DC Converter:
1.0 A
Secondary LDO:
0.4 A
Operating Frequency
Step-down DC / DC Converter:
200 k to 600 kHz (Typ)
Standby Current:
0 μA (Typ)
Operating Temperature Range: -40 °C to +125 °C
Package
HTSSOP-B24
W(Typ) x D(Typ) x H(Max)
7.80 mm x 7.60 mm x 1.00 mm
Applications
Microcontroller for Automotive
HTSSOP-B24
Typical Application Circuit
VO1
VCC
EN1
VREG
RT
PVCC
SW
VCC
or
VO1
FB
COMP
EN2
PGND
VS
VO2
PG1
RST2
PG2
CT ENWD CLK
RSTWD
RTW GND
OPEN
(Note1)
VO1
These specifications may be changed without a notice.
(Note 1) Please connect when the application is that the load current of VO1 output exceed in 500 mA.
Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
This product has no designed protection against radioactive rays
1/39
TSZ02201-0T2T0AM00180-1-2
11.Sep.2014 Rev.002

1 page




BD39012EFV-C pdf
BD39012EFV-C
Description of Blocks
Internal Power Supply (VREG)
It is the block which generates 4.0 V internal power supply voltage. It is a power supply to supply to the IC inside.
Please do not be connected to the outside circuit.
VREG needs to outside capacitor more than 1 μF. Low capacitor of the ESR is recommended.
Enable (EN1)
The circuit becomes standby state when EN1 pin becomes less than 0.8 V. Internal power supply and DC / DC convertor
are OFF and consumption current from VCC becomes 0 μA (25 °C, Typ) when standby state.
It can be used when connected to VCC or inputted into the signal from a microcomputer.
Soft Start (SOFT START)
The Soft start is a block to prevent over short of the output voltage in the startup and inrush current to an output step.
With controlling error amp input voltage and increasing switching pulse width gradually, it prevents then.
Because the soft start time operate an internal counter by oscillation frequency and decides time, it depends on the
oscillation frequency setting of the DC / DC converter. It becomes 3.28 ms (Typ) when oscillation frequency is 500 kHz.
It reboots after an internal SS pin is discharged when VSOVP, TSD1, and SCP are detected.
Error Amp (ERR)
The error amp compares the output feedback voltage to the 0.8V reference voltage. This comparison result is output to
COMP pin as current. By the voltage of the COMP pin, switching duty is decided. In the startup because soft start is taken,
COMP voltage is limited by SOFT START voltage. In addition, COMP pin needs to outside resistance and capacitor for
phase compensation.
PWM COMP (PWM)
PWM comparator makes a conversion to a continuous duty cycle to control an output transistor in the voltage of
COMP pin. The duty becomes 100 % and the high-side output transistor becomes ON state if input voltage becomes less
than setting output voltage.
Oscillation frequency for DC / DC convertor (OSC_DCDC)
Oscillation frequency is decided by the current which is caused by resistance connected to RT pin.
The range of oscillation frequency can be set 200 kHz to 600 kHz.
Short circuit protection starts operating and oscillator stops when RT pin is short-circuited to ground.
Short Circuit Protection (SCP)
DC / DC convertor stores with short circuit protection. The short circuit protection starts operation after the short circuit
protection circuit considers that the output is in short state when the over current protection starts operation in a state with
FB pin voltage less than 0.45 V (Typ) (Except during soft start).
DC / DC convertor output is OFF when the short circuit protection starts operation. In addition, SOFT START is initialized
and COMP pin is discharged. Afterwards, it reboots after 1,024 cycles of the oscillation frequency.
Reference Voltage of 2 systems
DC / DC convertor and LDO have a reference voltage which is made from an independent block in both output voltage part
and abnormal detection part.
In this way, even if there was an abnormality in reference voltage of whichever it is suitable for a safe design because
abnormality can be informed from PG pin
Each reference voltage is used as follows.
VREF1A: Reference of DC / DC convertor output voltage and VREG voltage.
VREF1B: Reference of DC / DC convertor OVD, LVD, SCP, VSOVP and OCP.
VREF2A: Reference of LDO output voltage.
VREF2B: Reference of LDO OVD and LVD.
Over Voltage Detection (OVD)
PG1 pin becomes L when reference voltage of DC / DC convertor exceeds 0.95 V (Typ).
PG2 pin becomes L when output voltage of LDO exceeds 5.38 V (Typ).
Low Voltage Detection (LVD)
PG1 pin becomes L when reference voltage of DC / DC convertor is less than 0.65 V (Typ).
PG2 pin becomes L when output voltage of LDO is less than 4.62 V (Typ).
Over Current Protection Circuit (OCP, SCP)
DC / DC convertor and LDO store with over current protection. Current limit is taken in the over current detection of the
DC / DC converter, and ON duty cycle is limited, and output voltage decreases. In addition, when it becomes overloaded
and FB pin voltage decreases and is less than 0.45 V (Typ), SCP is detected. Afterwards, it reboots after 1,024 cycles of the
oscillation frequency. Current limit is taken in the over current detection of the LDO, and output voltage decreases (foldback
current limiting characteristic). When it load-short-circuited, it prevents the destruction of the IC, but this protection circuit is
effective for prevention of destruction by the sudden accident. It is not supported use at the continuous protection circuit
operation and a transitional period.
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
5/39
TSZ02201-0T2T0AM00180-1-2
11.Sep.2014 Rev.002

5 Page





BD39012EFV-C arduino
BD39012EFV-C
Typical Performance Curves
5
4
3
2
1
0
-1
0
-40
25
125
6 12 18 24 30
Supply Voltage: VCC [V]
36
Figure 2. Standby Current vs Supply Voltage
(Standby Circuit Current)
4
-40
3 25
125
2
1
0
0 6 12 18 24 30 36
Supply Voltage: VCC [V]
Figure 3. VCC Circuit Current vs Supply Voltage
(VCC Circuit Current)
2.0
-40
25
1.5 125
1.0
0.5
0.0
0
2468
Supply Voltage: VS [V]
10
Figure 4. VS Circuit Current vs VS Supply Voltage
(VS Circuit Current)
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.3
-40
UVLO Undetect
UVLO Detect
-10 20 50 80 110
Ambient Temperature: Ta [ C]
Figure 5. UVLO Detect Voltage vs Ambient Temperature
(UVLO Detection Voltage)
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
11/39
TSZ02201-0T2T0AM00180-1-2
11.Sep.2014 Rev.002

11 Page







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