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Single-chip Type with Built-in FET Switching Regulator Series
2-output High-efficiency Step-down
Switching Regulators
with Built-in Power MOSFET
BD9302FP
Description
The BD9302FP is a 2-channel step-down switching regulator controller with a 2.5-MHz, 2-A power switch and available for
2.5-MHz high speed switching operation, which facilitates settings of switching frequency with external resistance, supporting
for a wide input voltage range of 6 to 18 V. Furthermore, due to a low reference voltage of 0.6 V, this BD9302FP is an L/C best
suited to high-voltage input/low-voltage output applications, for example, to step down a voltage from 12 V to 1.2 V.
Features
1) A wide input voltage range of 6 V to 18 V
2) Easy switching frequency setting in the range of 200 k to 2.5 MHz.
3) Two built-in power switches of 0.4 Ω, 2 A.
4) 180˚ phase shift
5) Built-in Under Voltage Lock Out circuit
6) Built-in overcurrent protection circuit
7) Built-in Thermal Shutdown circuit
Use
Power supply for DPS requiring two power sources
ADSL modem/plasma display
Audio devices
TECHNICAL NOTE
Downloaded From
Oneyac.com
Dec. 2008
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Summary of Contents for Rohm BD9302FP
- Page 1 2.5-MHz high speed switching operation, which facilitates settings of switching frequency with external resistance, supporting for a wide input voltage range of 6 to 18 V. Furthermore, due to a low reference voltage of 0.6 V, this BD9302FP is an L/C best suited to high-voltage input/low-voltage output applications, for example, to step down a voltage from 12 V to 1.2 V.
- Page 2 Absolute maximum ratings (Ta=25˚C) Item Symbol Rating Unit Power supply voltage Power dissipation 1450* Operating temperature Topr -40 ~ +85 ˚C Storage temperature Tstg -55 ~ +150 ˚C Output current Maximum junction temperature Tjmax ˚C * Should be derated by 11.6 mW/˚C at Ta=25˚C or more. When mounted on a glass epoxy PCB of 70¥70¥1.6 mm) ** Should not exceed Pd-value.
- Page 3 Electrical characteristics Electrical characteristics (Unless otherwise specified, Ta=25˚C, Vcc=12 V, R =10 kΩ) Limits Unit Conditions Item Symbol [Error amplifier block] – Input bias current – – Voltage gain COMP maximum output voltage 1.75 1.95 – = -0.1mA COMP – COMP minimum output voltage =0.1mA COMP...
- Page 4 Reference characteristics data 0.66 0.65 0.64 0.63 0.62 0.61 0.60 85˚C 0.59 0.58 0.57 0.56 0.55 0.54 0.53 -40˚C 25˚C 0.52 0.51 0.50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 85 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 85 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 AMBIENT TEMPERATURE : Ta [˚C] AMBIENT TEMPERATURE : Ta [˚C]...
- Page 5 Reference characteristics data 8 9 10 11 12 13 14 15 16 17 18 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 0.01 0.10 1.00 INPUT VOLTAGE : VCC [V] SWITCHING FREQUENCY : FSW [kHz] SS CAPACITOR : CSS [μF] Fig.11 Fig.12 Fig.13...
- Page 6 Pin assignment Block diagram PGND1 SW1L PGND1 SW1L COMP1 COMP1 BOOT1 0.6V N.C. PVCC Current Sense SS1/SDWN PVCC DRV2 BOOT1 SDWN slope DRV1 Reset N.C. SS2/SDWN PVCC SDWN PVCC N.C. PVCC SS1/SDWN BOOT2 COMP2 PVCC UVLO PGND2 Internal SW2L VREF Bias PVCC SS2/SDWN...
- Page 7 PGND1 SW1L 33pF 100kΩ 3300 COMP1 20kΩ 0.6V Current μH Sense VO : 3.3V 22kΩ 0.1μF 10μF BOOT1 DRV2 SDWN slope 51kΩ DRV1 Reset N.C. PVCC SDWN SS1/SDWN 0.1μF PVCC UVLO Internal VREF μF Bias SS2/SDWN PVCC 0.1μF PVCC N.C. SDWN 0.6V DRV1...
- Page 8 Timing chart Startup sequence Fig.20 Startup sequence Normal operation Fig.21 While in normal operation 8/16 Downloaded From Oneyac.com...
- Page 9 External component setting procedure (1) Setting of output L constant The coil L used for output is determined according to the rated current I and the maximum load current value I OMAX of the coil. Adjust so that (IOMAX + DI ) will not conflict with the rating.
- Page 10 (3) Setting of feedback resistance constant In order to make settings of feedback resistance, refer to the formula shown. It is recommended to make setting of resistance in the range of 10 kΩ to 330 kΩ. Setting the resistance to 10 kΩ or less will result in degraded power efficiency, while setting it to 330 kΩ...
- Page 11 (6) Phase compensation Phase compensation setting procedure The phase compensation setting procedure varies with the selection of capacitance used for DC/DC converter application. In this connection, the following section describes the procedure by classifying into the two types. Furthermore, the application stability conditions are described in the “Description” section. 1.
- Page 12 For output capacitors having high ESR, such as aluminum electrolytic capacitor For output capacitors having high ESR (i.e., several ohms), the phase compensation setting procedure becomes comparatively simple. Since the DC/DC converter application has surely a LC resonant circuit attached to the output, a -180˚...
- Page 13 Equivalent circuit VREG 3.FB1 VREG 2.COMP1 10.FB2 11.COMP2 1kΩ 20Ω 5kΩ 2.5kΩ 5kΩ 6.SS1/SDWN 4.RT VREG 8.SS2/SDWN 2kΩ 170Ω 50Ω 100kΩ 15.SW2 PVcc 14.SW2L 16.SW2 25.SW1L PVcc 23.SW1 BOOT 24.SW1 17.BOOT2 22.BOOT1 10Ω Fig.34 Equivalent circuit 13/16 Downloaded From Oneyac.com...
- Page 14 Cautions on use 1) Absolute maximum ratings Even though thorough attention is exerted to the quality control of this IC, exceeding the absolute maximum ratings, such as applied voltage, operating temperature range, etc., can break down the IC. Should the IC break down, it will be impossible to identify breaking mode such as short circuit mode or an open mode.
- Page 15 8) Ground wiring pattern If small-signal GND and large-current GND are provided, It will be Bypass diode recommended to separate the large-current GND pattern from the Backflow prevention diode small-signal GND pattern and establish a single ground at the reference point of the set PCB so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal GND.
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Page 16: Product Name
Reel No. 1 pin (Unit : mm) * Please place an order for this IC in multiplies of the quantity per package. The contents described herein are correct as of December, 2008 Catalog No. 08T907A '08.12 ROHM© Downloaded From Oneyac.com... - Page 17 (“Specific Applications”), please consult with the ROHM sales representative in advance. Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific Applications.
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Page 18: Data Sheet
ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable for infringement of any intellectual property rights or other damages arising from use of such information or data.:... -
Page 19: General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents. ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny ROHM’s Products against warning, caution or note contained in this document. - Page 20 Datasheet BD9302FP - Web Page Distribution Inventory Part Number BD9302FP Package HSOP25 Unit Quantity 2000 Minimum Package Quantity 2000 Packing Type Taping Constitution Materials List inquiry RoHS Downloaded From Oneyac.com...
- Page 21 单击下面可查看定价，库存，交付和生命周期等信息 >>ROHM Semiconductor(罗姆) Downloaded From Oneyac.com...
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