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2010.04 - Rev.B

Single-chip built-in FET type Switching Regulators

Output 2A or More High Efficiency

Step-down Switching Regulator

with Built-in Power MOSFET

BD9111NV

●Description

ROHM’s high efficiency step-down switching regulator BD9111NV is a power supply designed to produce a low voltage

including 3.3 volts from 5 volts power supply line. Offers high efficiency with our original pulse skip control technology and

synchronous rectifier. Employs a current mode control system to provide faster transient response to sudden change in load.

●Features

1) Offers fast transient response with current mode PWM control system.

2) Offers highly efficiency for all load range with synchronous rectifier (Nch/Pch FET)

and SLLM

(Simple Light Load Mode)

3) Incorporates soft-start function.

4) Incorporates thermal protection and ULVO functions.

5) Incorporates short-current protection circuit with time delay function.

6) Incorporates shutdown function

7) Employs small surface mount package : SON008V5060

●Applications

Power supply for LSI including DSP, Micro computer and ASIC

●Absolute Maximum Ratings (Ta=25℃)

Parameter Symbol Ratings Unit

VCC Voltage VCC -0.3～+7

PVCC Voltage PVCC -0.3～+7

EN Voltage VEN -0.3～+7 V

SW,ITH Voltage VSW,VITH -0.3～+7 V

Power Dissipation 1 Pd1 900

Power Dissipation 2 Pd2 3900

Operating temperature range Topr -25～+105 ℃

Storage temperature range Tstg -55～+150 ℃

Maximum junction temperature Tjmax +150 ℃

*1 Pd should not be exceeded.

*2 Derating in done 7.2mW/℃ for temperatures above Ta=25℃, Mounted on 70mm×70mm×1.6mm Glass Epoxy PCB (the density of copper:3%)

*3 Derating in done 31.2mW/℃ for temperatures above Ta=25℃, Mounted on JESD51-7.

●Operating Conditions (Ta=25℃)

Parameter Symbol

Ratings

Unit

Min. Typ. Max.

VCC Voltage VCC

4.5 5.0 5.5 V

PVCC Voltage PVCC

4.5 5.0 5.5 V

EN Voltage VEN 0 - VCC V

SW average output current Isw

- - 2.0 A

*4 Pd should not be exceeded.

No.10027EBT32

Summary of content (14 pages)

PAGE 1
Single-chip built-in FET type Switching Regulators Output 2A or More High Efficiency Step-down Switching Regulator with Built-in Power MOSFET BD9111NV No.10027EBT32 ●Description ROHM’s high efficiency step-down switching regulator BD9111NV is a power supply designed to produce a low voltage including 3.3 volts from 5 volts power supply line. Offers high efficiency with our original pulse skip control technology and synchronous rectifier.
PAGE 2
Technical Note BD9111NV ●Electrical Characteristics (Ta=25℃, VCC=PVCC=3.3V, EN=VCC.) Parameter Symbol Limits Min. Typ. Unit Max. Standby current ISTB - 0 10 μA Bias current ICC - 250 450 μA Conditions EN=GND EN Low voltage VENL - GND 0.8 V Standby mode EN High voltage VENH 2.0 VCC - V Active mode EN input current IEN - 1 10 μA VEN=5V Oscillation frequency FOSC 0.8 1 1.
PAGE 3
Technical Note BD9111NV ●Characteristics data 5.0 3.5 3.0 2.5 2.0 1.5 1.0 1.5 1.0 VCC=5V Ta=25℃ Io=0A 0.5 0.5 0 1 2 3 4 INPUT VOLTAGE:VCC[V] 0 5 1 100 3.34 90 3.30 3.29 3.28 40 30 10 VCC=5V Ta=25℃ 25 50 75 1 100 10 100 1000 OUTPUT CURRENT:IOUT[mA] TEMPERATURE:Ta[℃] 1.10 1.05 1.00 0.95 0.90 0.85 0 3.25 10000 0.80 -25 0.40 CIRCUIT CURRENT:I CC [μA] 350 1.6 EN VOLTAGE:VEN[V] 0.25 PMOS NMOS 0.10 1.4 1.2 1.0 0.8 0.6 0.4 0.05 -25 0 25 50 75 TEMPERATURE:Ta[℃] 100 Fig.
PAGE 4
Technical Note BD9111NV 1.2 【SLLM control】 FREQUENCY:FOSC[MHz] Ta=25℃ 1.1 VCC=PVCC OUT V=EN SW 1msec VOUT 1 VCC=5V Ta=25℃ Io=0A 0.9 0.8 2.7 3.1 3.5 3.9 4.3 4.7 INPUT VOLTAGE:VCC [V] 5.1 VCC=5V Ta=25℃ 5.5 Fig.12 Vcc-Fosc Fig.13 Soft start waveform Fig.14 SW waveform Io=10mA 【PWM control】 110mV 100mV VOUT IOUT IOUT VCC=5V Ta=25℃ VCC=5V Ta=25℃ Fig.15 SW waveform Io=200mAs www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. VOUT Fig.
PAGE 5
Technical Note BD9111NV ●Information on advantages Advantage 1：Offers fast transient response with current mode control system. BD9111NV (Load response IO=1A→2A) Conventional product (Load response IO=0.1A→0.6A) VOUT VOUT 100mV 160mV IOUT IOUT Voltage drop due to sudden change in load was reduced by about 50%. Fig.18 Comparison of transient response Advantage 2： Offers high efficiency for all load range.
PAGE 6
Technical Note BD9111NV ●Operation BD9111NV is a synchronous rectifying step-down switching regulator that achieves faster transient response by employing current mode PWM control system. It utilizes switching operation in PWM (Pulse Width Modulation) mode for heavier load, while it utilizes SLLM (Simple Light Load Mode) operation for lighter load to improve efficiency.
PAGE 7
Technical Note BD9111NV ●Description of operations ・Soft-start function EN terminal shifted to “High” activates a soft-starter to gradually establish the output voltage with the current limited during startup, by which it is possible to prevent an overshoot of output voltage and an inrush current. ・Shutdown function With EN terminal shifted to “Low”, the device turns to Standby Mode, and all the function blocks including reference voltage circuit, internal oscillator and drivers are turned to OFF.
PAGE 8
Technical Note BD9111NV ●Switching regulator efficiency Efficiency ŋ may be expressed by the equation shown below: η= VOUT×IOUT Vin×Iin ×100[%]= POUT Pin ×100[%]= POUT POUT+PDα ×100[%] Efficiency may be improved by reducing the switching regulator power dissipation factors PDα as follows: Dissipation factors: 1) ON resistance dissipation of inductor and FET：PD(I2R) 2) Gate charge/discharge dissipation：PD(Gate) 3) Switching dissipation：PD(SW) 4) ESR dissipation of capacitor：PD(ESR) 5) Operating curre
PAGE 9
Technical Note BD9111NV ●Selection of components externally connected 1. Selection of inductor (L) IL The inductance significantly depends on output ripple current. As seen in the equation (1), the ripple current decreases as the inductor and/or switching frequency increases. (VCC-VOUT)×VOUT ΔIL= [A]・・・(1) L×VCC×f ΔIL VCC IL Appropriate ripple current at output should be 20% more or less of the maximum output current. VOUT L ΔIL=0.3×IOUTmax. [A]・・・(2) Co L= Fig.
PAGE 10
Technical Note BD9111NV 4. Determination of RITH, CITH that works as a phase compensator As the Current Mode Control is designed to limit a inductor current, a pole (phase lag) appears in the low frequency area due to a CR filter consisting of a output capacitor and a load resistance, while a zero (phase lead) appears in the high frequency area due to the output capacitor and its ESR.
PAGE 11
Technical Note BD9111NV Cautions on PC Board layout ●BD9111NV VCC 1 2 3 RITH ③ CITH 4 EN 8 VOUT VCC PVCC ITH SW GND PGND EN 7 6 5 L ① VOUT CIN ② Co GND Fig.33 Layout diagram ①For the sections drawn with heavy line, use thick conductor pattern as short as possible. ②Lay out the input ceramic capacitor CIN closer to the pins PVCC and PGND, and the output capacitor Co closer to the pin PGND. ③Lay out CITH and RITH between the pins ITH and GND as near as possible with least necessary wiring.
PAGE 12
Technical Note BD9111NV ●Notes for use 1. Absolute Maximum Ratings While utmost care is taken to quality control of this product, any application that may exceed some of the absolute maximum ratings including the voltage applied and the operating temperature range may result in breakage. If broken, short-mode or open-mode may not be identified.
PAGE 13
Technical Note BD9111NV ●Ordering part number B D 9 Part No. 1 1 1 N Part No. 9111 V - E 2 Package Packaging and forming specification NV : SON008V5060 E2: Embossed tape and reel (SON008V5060) SON008V5060 6.0 ± 0.15 5.0±0.15 4.2±0.1 1.27 2 3 4 0.59 8 7 5 2000pcs Direction of feed S E2 The direction is the 1pin of product is at the upper left when you hold ( reel on the left hand and you pull out the tape on the right hand ) 3.6 ± 0.1 1 0.8 ± 0.
PAGE 14
Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request.