BM1430 Datasheet PDF - bookly
| Part Number | BM1430 | |
| Description | 3.0A Step-Down Converter | |
| Manufacturers | bookly | |
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3.0A Step-Down Converter
BM1430
FEATURES
3A Output Current
Efficiency up to nearly 90% @+5V /3A output
+3.85V to +23V Input Range
55µA Shutdown Supply Current
380kHz Switching Frequency
Adjustable Output Voltage from 1.22V to 0.85*VIN
Cycle-by-Cycle Current Limit Protection
Thermal Shutdown Protection
Frequency Fold Back at Short Circuit
Low start up input voltage ; Low dropout to nearly 0.7V
full pin-pin with ACT4060/ TD1410 / MP1410
SOP-8 Package
GENERAL DESCRIPTION
The BM1430 is a current-mode step-down
DC-DC converter that generates up to 3A output
current at 380kHz switching frequency. The device
utilizes advanced BCD process for operation with
input voltage up to +23V consuming only 55µA in
shutdown mode, the BM1430 is highly efficient
with peak efficiency at 90% when in operation.
Protection features include cycle-by-cycle
current limit, thermal shutdown, and frequency fold
back at short circuit.
The BM1430 is available in SOP-8
package and requires very few external
devices for operation.
APPLICATIONS
TFT LCD Monitors
Portable DVDs
NET CARD
Telecom Power Supplies
DSL and Cable Modems and Routers
LCD TV
It can replace TD1410/MP9141 without
change external components and PCB layout.
If Vin is over 12V, if not use pin7
function , can pull-up a 100K ohm to Vin input
with a pull-up resistor, be better not short to Vin
dirrectly.
Figure4.
XL1583
Typical
Figure
1A. TpypplicicalaAtipopnlicCatiiorncuCiitrc1u2itV-5(CVFF/3=A0
~ 33nF)
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BM1430
APPLICATION INFORMATION
OUTPUT VOLTAGE SETTING
Vout
RFB1
FB
RFB2
Figure 3. Output Voltage Setting
Figure 3 shows the connections for setting
the output voltage. Select the proper ratio of the
two feedback resistors RFB1 and RFB2 based on
the output voltage. Typically, use RFB2 ≈10kΩ
and determine RFB1 from the output voltage:
RFB1
=
RFB
2
⎛
⎜⎝
VOUT
1.225V
−1⎞⎟⎠
(1 )
INDUCTOR SELECTION
The inductor maintains a continuous current
to the output load. This inductor current has a
ripple that is dependent on the inductance value:
higher inductance reduces the peak-to-peak
ripple current. The trade off for high inductance
value is the increase in inductor core size and
series resistance, and the reduction in current
handling capability. In general, select an
inductance value L based on ripple current
requirement:
L = VOUT • (VIN −VOUT )
V f I KIN SW OUTMAX RIPPLE
(2 )
where VIN is the input voltage, VOUT is the output
voltage, fSW is the switching frequency, IOUTMAX is
the maximum output current, and KRIPPLE is the
ripple fCXor. Typically, choose KRIPPLE = 30% to
correspond to the peak-to-peak ripple current
being 30% of the maximum output current.
With this inductor value (Table 1), the peak
inductor current is IOUT • (1 + KRIPPLE / 2).
Make sure that this peak inductor current is less
that the 4A current limit. Finally, select the
inductor core size so that it does not saturate at 3A.
Table 1. Typical Inductor Values
Vout 1.5v 1.8v 2.5v
L(µH) >=6.8 >=6.8 >=10
3.3v
>=15
5v
>=22
12v
>=47
INPUT CAPACITOR
The input capacitor needs to be carefully selected to
maintain sufficiently low ripple at the supply input of the
converter. A low ESR capacitor is highly recommended.
Since large current flows in and out of this capacitor
during switching, its ESR also affects efficiency.
The input capacitance needs to be higher than 10µF.
The best choice is the ceramic type; however, low ESR
tantalum or electrolytic types may also be used provided
that the RMS ripple current rating is higher than 50% of
the output current. The input capacitor should be placed
close to the IN and G pins of the IC, with shortest traces
possible. In the case of tantalum or electrolytic types,
they can be further away if a small parallel 0.1µF ceramic
capacitor is placed right next to the IC.
OUTPUT CAPACITOR
The output capacitor also needs to have low ESR to
keep low output voltage ripple. The output ripple voltage
is:
V RIPPLE = IOUTMAX KRIPPLE RESR
+
VIN
28 fsw2 LCOUT
(3)
where IOUTMAX is the maximum output current, KRIPPLE is
the ripple fCXor, RESR is the ESR resistance of the output
capacitor, fSW is the switching frequency, L in the inductor
value, COUT is the output capacitance. In the case of
ceramic output capacitors, RESR is very small and does
not contribute to the ripple. Therefore, a lower
capacitance value can be used for ceramic type. In the
case of tantalum or electrolytic type, the ripple is
dominated by RESR multiplied by the ripple current. In that
case, the output capacitor is chosen to have sufficiently low
ESR.
For ceramic output type, typically choose a
capacitance of about 22µF. For tantalum or electrolytic
type, choose a capacitor with less than 50mΩ ESR.
RECTIFIER DIODE
Use a Schottky diode as the rectifier to conduct
current when the High-Side Power Switch is off. The
Schottky diode must have current rating higher than the
maximum output current and the reverse voltage rating
higher than the maximum input voltage.
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