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PDF BD9328EFJ Data sheet ( Hoja de datos )
| Número de pieza | BD9328EFJ | |
| Descripción | Synchronous Buck Converter | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
4.2V to 18V, 2A 1ch
Synchronous Buck Converter with
Integrated FET
BD9328EFJ
General Description
The BD9328EFJ is a synchronous step-down
switching regulator with built-in two low-resistance
N-Channel MOSFETs. This IC can supply continuous
output current of 2A over a wide input range, and
provides not only fast transient response, but also
easy phase compensation because of current mode
control.
Features
Uses Low ESR Output Ceramic Capacitors
Low Standby Current
380 kHz Fixed Operating Frequency
Feedback Voltage
0.9V ± 1.5%(Ta=25°C)
0.9V ± 2.0%(Ta=-25°C to +85°C)
Under Voltage Protection
Thermal Shutdown
Over Current Protection
Key Specifications
Input Voltage Range:
4.2V to 18V
Output Voltage Range:
0.9V to (VIN x 0.7)V
Output Current:
2A (Max)
Switching Frequency:
380kHz(Typ)
Hi-Side FET ON-Resistance:
0.15Ω(Typ)
Lo-Side FET ON-Resistance:
0.13Ω(Typ)
Standby Current:
15μA (Typ)
Operating Temperature Range: -40°C to +85°C
Package
W (Typ) D (Typ) H (Max)
Applications
Distributed Power Systems
Pre-Regulator for Linear Regulators
HTSOP-J8
4.90mm x 6.00mm x 1.00mm
Typical Application Circuit
C_SS
0.1μF
C_PC
3300pF
R_PC
7.5kΩ
R_DW
10kΩ
R_UP
27kΩ
Thermal Pad
(to be shorted to GND)
VIN = 12V
C_VC1
10μF
L
10µH
VOUT = 3.3V
C_CO1
20μF
Figure 1. Typical Application Circuit
R_BS protect from VIN-BST short destruction.
〇Product structure : Silicon monolithic integrated circuit
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
〇This product has no designed protection against radioactive rays
1/19
TSZ02201-0323AAJ00020-1-2
16.Feb.2015 Rev.003
1 page  
BD9328EFJ
Typical Performance Curves - continued
Temperature [°C]
Figure 8. Hi-Side, Low-Side FET
ON-Resistance vs Temperature
Datasheet
390
385
380
375
370
365
360
-4 0 -2 0
0 20 40
TemT EpeMraPtu(re°C[°)C]
60
80
Figure 9. Operating Frequency vs Temperature
95
90
85
80
75
70
65
60
55
50
0
500
1000
1500
IOIo[[mmAA] ]
2000
Figure 10. STEP-Down Efficiency vs IO
(VIN= 12V VOUT= 3.3V L=10µH)
CSS [µF]
Figure 11. Soft Start Time vs
Soft Start Capacitor
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/19
TSZ02201-0323AAJ00020-1-2
16.Feb.2015 Rev.003
5 Page 
BD9328EFJ
Datasheet
(a) Choosing phase compensation resistor RCMP
The compensation resistor RCMP can be calculated by the following formula:
RCMP
2
VOUT fCRS COUT
VFB GMP GMA
Where:
VOUT is the Output voltage
fCRS is the Cross over frequency
COUT is the Output capacitor
VFB is the Internal feedback voltage (0.9V(TYP))
GMP is the Current Sense Gain (7.8A/V(TYP))
GMA is the Error Amplifier Trans-conductance (300µA/V(TYP))
Setting VOUT= 3.3V, fCRS= 38kHz, COUT= 20µF;
RCMP
2 3.3 38k 20
0.9 7.8 300
7482.5 7.5k
[]
(b) Choosing phase compensation capacitor CCMP
For stability of the DC/DC converter, cancellation of the phase delay that derives from output capacitor COUT and
resistive load ROUT is possible by inserting the phase advance.
The phase advance can be added by the zero on compensation resistor RCMP and capacitor CCMP.
Making fZ= fCRS / 6 gives a first-order estimate of CCMP.
Compensation Capacitor
Setting fZ= fCRS/6 = 6.3kHz;
Compensation Capacitor
CCMP
2
1
RCMP
fz
F
C CMP
2
1
RCMP
6.3k
3.368 10 9
3.3 10 9
[F]
However, the best values for zero and FCRS differ between applications. Decide the values accordingly after
calculation using the formula above and confirmation on the actual application.
(c) The condition of the loop compensation stability
The stability of DC/DC converter is important. To ensure operation stability, check if the loop compensation has
enough phase-margin. For the condition of loop compensation stability, the phase-delay must be less than 150
degrees at 0 dB Gain.
Feed-forward capacitor, CRUP, boosts phase margin over a limited frequency range and is sometimes used to
improve loop response. CRUP will be more effective if RUP >> RUP||RDW
VOUT
RUP
RDW
CRUP
FB
－
＋
0.9V
COMP
Figure 21
A
Gain [dB]
0
RCMP
CCMP
PPhHaAsSeE 0
－90
－180
(a)
GBW(b)
fFCCRRSS
－90°
PHPAhSaEseMMARaGrgIiNn
－180°
Figure 22
F
F
(3) Design of Feedback Resistance constant
Set the feedback resistance as shown below.
VOUT
R1
R2
0.9V
+
ERR
－
FB
VOUT
R1 R2 0.9
R2
[V ]
Figure 23
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/19
TSZ02201-0323AAJ00020-1-2
16.Feb.2015 Rev.003
11 Page | ||
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| PDF Descargar | [ Datasheet BD9328EFJ.PDF ] | |
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