NJW4132. Switching Regulator IC for Boost Converter

Transcription

1 NJW43 Switching Regulator IC for Boost Converter Current Mode Control w/ 45V/.75A MOSFET GENERAL DESCRIPTION The NJW43 is a boost converter with 45V/.75A MOSFET. It corresponds to high oscillating frequency, and Low ESR Output Capacitor (MLCC) within wide input range from 4.5V to 4V. Therefore, the NJW43 can realize downsizing of applications with a few external parts so that adopts current mode control. Also, it has a soft start function, external clock synchronization, over current protection and thermal shutdown circuit. It is suitable for boost application to a Car Accessory, Office Automation Equipment, Industrial Instrument and so on. PACKAGE OUTLINE NJW43U FEATURES Current Mode Control External Clock Synchronization Wide Operating Voltage Range 4.5V to 4V Switching Current.75A min. PWM Control Built-in Compensation Circuit Correspond to Ceramic Capacitor (MLCC) Oscillating Frequency 3kHz typ. (A ver.) 7kHz typ. (B ver.).mhz typ. (C ver.) Soft Start Function ms typ. UVLO (Under Voltage Lockout) Over Current Protection (Hiccup type) Thermal Shutdown Protection Standby Function Package Outline NJW43U : SOT PRODUCT CLASSIFICATION Part Number Version Oscillation Frequency Package NJW43U-A A 3kHz typ. SOT NJW43U-B B 7kHz typ. SOT NJW43U-C C.MHz typ. SOT Operating Temperature Range General Spec. -4 C to +85 C General Spec. -4 C to +85 C General Spec. -4 C to +85 C Ver

2 NJW43 PIN CONFIGURATION 5 () 4 3 PIN FUNCTION. SW. GND 3. IN- 4. EN/SYNC 5. V + NJW43U BLOCK DIAGRAM V + SW UVLO EN/SYNC High: ON Low : OFF(Standby) Enable (Standby) TSD k SYNC OSC S Q Buffer IN- Low Frequency Control PWM R OCP Soft Start Vref ER AMP CURRENT SENSE V SLOPE COMP. GND - - Ver.7--5

3 NJW43 ABSOLUTE MAXIMUM RATINGS (Ta=5 C) PARAMETER SYMBOL MAXIMUM RATINGS UNIT Supply Voltage V V SW pin Voltage V SW +45 V IN- pin Voltage V IN- -.3 to +6 V EN/SYNC pin Voltage V EN/SYNC +45 V Power Dissipation P D SOT (*),4 (*) mw Junction Temperature Range Tj -4 to +5 C Operating Temperature Range T opr -4 to +85 C Storage Temperature Range T stg -4 to +5 C (*): Mounted on glass epoxy board. ( mm:based on EIA/JEDEC standard, Layers) (*): Mounted on glass epoxy board. ( mm:based on EIA/JEDEC standard, 4Layers) (For 4Layers: Applying mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD5-5) RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN. TYP. MAX. UNIT Supply Voltage V V External Clock Input Range A version B version C version f SYNC 9 69,8 5,,4 khz Ver

4 NJW43 ELECTRICAL CHARACTERISTICS (Unless otherwise noted, V + =V EN./SYNC =V, Ta=5 C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Under Voltage Lockout Block ON Threshold Voltage V T_ON V + = L H V OFF Threshold Voltage V T_OFF V + = H L V Hysteresis Voltage V HYS 7 mv Soft Start Block Soft Start Time T SS V B =.95V 5 5 ms Oscillator Block Oscillation Frequency Oscillation Frequency OCP operates Oscillation Frequency deviation (Supply voltage) Oscillation Frequency deviation (Temperature) f OSC f OSC_LIM A version, V IN- =.9V khz B version, V IN- =.9V khz C version, V IN- =.9V.8.. MHz A version, V IN- =.4V 5 khz B version, V IN- =.4V 7 khz C version, V IN- =.4V 4 khz f DV V + =4.5V to 4V % f DT Ta=-4 C to +85 C 5 % Error Amplifier Block Reference Voltage V B -.%. +.% V Input Bias Current I B -.. A PWM Comparate Block Maximum Duty Cycle Minimum ON Time (Use Built-in Oscillator) Minimum ON Time (Use Ext CLK) M AX D UTY t ON-min t ON-min A version, B version, V IN- =.9V 85 9 % C version, V IN- =.9V 8 85 % A version 3 45 ns B version 55 ns C version 8 ns A version, f SYNC =4kHz 355 ns B version, f SYNC =8kHz 9 5 ns C version, f SYNC =.MHz 8 ns OCP Block COOL DOWN Time t COOL 4 ms Output Block Output ON Resistance R ON I SW =A.4.65 Switching Current Limit I LIM A SW Leak Current I LEAK V EN/SYNC =V, V SW =45V A Ver.7--5

5 NJW43 ELECTRICAL CHARACTERISTICS (Unless otherwise noted, V + =V EN/SYNC =V, Ta=5 C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Standby Control Block ON Control Voltage V ON V EN/SYNC = L H.6 V + V OFF Control Voltage V OFF V EN/SYNC = H L.5 V Input Bias Current (EN/SYNC pin) I EN A version, B version, V EN/SYNC =V 65 3 A C version, V EN/SYNC =V 5 4 A General Characteristics A version, R L =no load, V IN- =.9V..65 ma Quiescent Current I DD B version, R L =no load, V IN- =.9V.5 3. ma C version, R L =no load, V IN- =.9V ma Standby Current I DD_STB V EN/SYNC =V A Ver

6 NJW43 TYPICAL APPLICATIONS Boost Converter V IN C IN L SBD C OUT V OUT C FB R R FB V + SW NJW43 EN/ SYNC GND R EN/SYNC High: ON Low: OFF (Standby) Buck-Boost (SEPIC) Converter V IN C IN L C SBD C OUT V OUT C FB R R FB V + SW L NJW43 EN/ SYNC GND IN- IN- R EN/SYNC High: ON Low: OFF (Standby) Ver.7--5

7 NJW43 TYPICAL CHARACTERISTICS (A, B, C version). Reference Voltage vs. Supply Voltage (Ta=5 C). Reference Voltage vs. Temperature (V + =V) Reference Voltage V B (V) Reference Voltage V B (V) Supply Voltage V + (V).99.8 Switching Current Limit vs. Temperature.8 Output ON Resistance vs. Temperature (I SW =A) Switching Current Limit I LIM (A) V + =4.5V, V, 4V Output ON Resistance R ON (W) V + =4.5V, V, 4V.4 Ver

8 NJW43 Threshold Voltage (V) TYPICAL CHARACTERISTICS (A, B, C version) Under Voltage Lockout Voltage vs. Temperature V T_ON V T_OFF Soft Start Time Tss (ms) Soft Start Time vs. Temperature (V + =V, V B =.95V) 3 Switching Leak Current vs. Temperature (V + =V, V EN/SYNC =V, V SW =45V) Standby Current vs. Temperature (V EN/SYNC =V) Switching Leak Current I LEAK (μa) Standby Current I DD_STB (μa) V + =4V V + =V V + =4.5V Ver.7--5

9 NJW43 TYPICAL CHARACTERISTICS (A version) 3 Oscillation Frequency vs. Supply Voltage (A ver., V IN- =.9V, Ta=5 C) 3 Quiescent Current vs. Supply Voltage (A ver., R L =no load, V IN- =.9V, Ta=5 C) Oscillation Frequnecny f OSC (khz) Quiescent Current I DD (ma) Supply Voltage V + (V) 3 4 Supply Voltage V + (V) 33 Oscillation Frequency vs Temperature (A ver., V + =V, V IN- =.9V) Maximum Duty Cycle vs. Temperature (A ver., V + =V, V IN- =.9V) Oscillation Frequency fosc (khz) Maximum Duty Cycle M AX D UTY (%) Minimum ON Time vs. Temperature (A ver., V + =V) 3 Quiescent Current vs. Temperature (A ver., R L =no load, V IN- =.9V) Minimum ON Time t ON-min (ns) Quiescent Current I DD (ma) V + =V, 4V V + =4.5V 5 Ver

10 NJW43 TYPICAL CHARACTERISTICS (B version) 7 Oscillation Frequency vs. Supply Voltage (B ver., V IN- =.9V, Ta=5 C) 3 Quiescent Current vs. Supply Voltage (B ver., R L =no load, V IN- =.9V, Ta=5 C) Oscillation Frequnecny f OSC (khz) Quiescent Current I DD (ma) Supply Voltage V + (V) 3 4 Supply Voltage V + (V) 78 Oscillation Frequency vs Temperature (B ver., V + =V, V IN- =.9V) Maximum Duty Cycle vs. Temperature (B ver., V + =V, V IN- =.9V) Oscillation Frequency fosc (khz) Maximum Duty Cycle M AX D UTY (%) Minimum ON Time vs. Temperature (B ver., V + =V) 3 Quiescent Current vs. Temperature (B ver., R L =no load, V IN- =.9V) Minimum ON Time t ON-min (ns) Quiescent Current I DD (ma) V + =4.5V, V, 4V Ver.7--5

11 NJW43 TYPICAL CHARACTERISTICS (C version) Oscillation Frequency f OSC (MHz) Oscillation Frequency vs. Supply Voltage (C ver., V IN -=.9V, Ta=5ºC) 3 4 Supply Voltage V + (V) Quiescent Current I DD (ma) Quiescent Current vs. Supply Voltage (C ver., R L =no load, V IN- =.9V, Ta=5ºC) 3 4 Supply Voltage V + (V) Oscillation Frequency f OSC (MHz) Oscillation Frequency vs. Temperature (C ver., V + =V, V IN- =.9V).7 Ambient Temperature Ta (ºC) Maximum Duty Cycle M AX D UTY (%) Maximum Duty Cycle vs. Temperature (C ver., V + =V, V IN- =.9V) 8 Ambient Temperature Ta (ºC) Minimum ON Time vs. Temperature (C ver., V + =V) 4 Quiescent Current vs. Temperature (C ver., R L =no load, V IN- =.9V) Minimum ON Time t ON-min (ns) Quiescent Current I DD (ma) V + =4.5V, V, 4V Ambient Temperature Ta (ºC) Ambient Temperature Ta (ºC) Ver

12 NJW43 Application Manual PIN DESCRIPTIONS PIN NAME PIN NUMBER FUNCTION SW Switch Output pin of Power MOSFET GND GND pin IN- 3 Output Voltage Detecting pin Connects output voltage through the resistor divider tap to this pin in order to voltage of the IN- pin become.v. EN/SYNC 4 Standby Control pin The EN/SYNC pin internally pulls down with k. Normal Operation at the time of High Level. Standby Mode at the time of Low Level or OPEN. Moreover, it operates by inputting clock signal at the oscillatory frequency that synchronized with the input signal. V + 5 Power Supply pin for Power Line - - Ver.7--5

13 Description of Block Features. Basic Functions / Features NJW43 Application NJW43 Manual Error Amplifier Section (ER AMP).V±% precise reference voltage is connected to the non-inverted input of this section. To set the output voltage, connects converter's output to inverted input of this section (IN- pin). If requires output voltage, inserts resistor divider. Because the optimized compensation circuit is built-in, the application circuit can be composed of minimum external parts. PWM Comparator Section (PWM), Oscillation Circuit Section (OSC) The NJW43 uses a constant frequency, current mode step up architecture. The oscillation frequency are 3kHz (typ.) at A version, 7kHz (typ.) at B version and.mhz (typ.) at C version. The PWM signal is output by feedback of output voltage and slope compensation switching current at the PWM comparator block. The maximum duty ratio is 9% (typ.) in A version and B version. Minimum ON time is limited in the inside of the IC. (Table.) Table. Minimum ON time of NJW43 A version (f OSC =3kHz) Use Built-in Oscillator Use External Clock B version (f OSC =7kHz) C version (f OSC =.MHz) 3ns typ. ns typ. 8ns typ. ns typ. (@ f SYNC =4kHz) 9ns typ. (@ f SYNC =8kHz) 8ns typ. (@ f SYNC =.MHz) The boost converter of ON time is decided the following formula. ton V V IN OUT f OSC s V IN shows input voltage and V OUT shows output voltage. When the ON time becomes below in t ON-min, in order to maintain output voltage at a stable state, change of duty or pulse skip operation may be performed. Power MOSFET (SW Output Section) The power is stored in the inductor by the switch operation of built-in power MOSFET. The output current is limited to.75a(min.) the overcurrent protection function. Power Supply, GND pin (V + and GND) In line with switching element drive, current flows into the IC according to frequency. If the power supply impedance provided to the power supply circuit is high, it will not be possible to take advantage of IC performance due to input voltage fluctuation. Therefore connect the input capacitor near V + pin the GND pin. When an IC and an input capacitor are far, insert bypass capacitor generally. F, and lower the high frequency impedance. Ver

14 NJW43 Application Manual Description of Block Features (Continued). Additional and Protection Functions / Features Under Voltage Lockout (UVLO) The UVLO circuit operating is released above V + =4.35V(typ.) and IC operation starts. When power supply voltage is low, IC does not operate because the UVLO circuit operates. There is mv(typ.) width hysteresis voltage at rise and decay of power supply voltage. Hysteresis prevents the malfunction at the time of UVLO operating and releasing. Soft Start Function (Soft Start) The output voltage of the converter gradually rises to a set value by the soft start function. The soft start time is ms (typ.). It is defined with the time of the error amplifier reference voltage becoming from V to.95v. The soft start circuit operates after the release UVLO and/or recovery from thermal shutdown..v Vref, IN- pin Voltage OSC Waveform SW pin ON OFF UVLO(4.35V typ.) Release, Standby, Recover from Thermal Shutdow n Soft Start time: Tss=ms(typ.) to V B =.95V Soft Start effective period to V B =.V Fig.. Startup Timing Chart Steady Operaton Ver.7--5

15 NJW43 Application NJW43 Manual Description of Block Features (Continued) Over Current Protection Circuit (OCP) NJW43 contains overcurrent protection circuit of hiccup architecture. The overcurrent protection circuit of hiccup architecture is able to decrease heat generation at the overload. The NJW43 output returns automatically along with release from the over current condition. At when the switching current becomes I LIM or more, the overcurrent protection circuit is stopped the MOSFET output. The switching output holds low level down to next pulse output at OCP operating. When IN- pin voltage becomes.75v or less, it oscillation frequency decreases to approximately 7% At the same time starts pulse counting, and stops the switching operation when the overcurrent detection continues approx 7ms (@ A ver.), 5ms (@ B ver.) and ms (@C ver.). After NJW43 switching operation was stopped, it restarts by soft start function after the cool down time of approx 4ms (typ.). IN- pin Voltage.V.75V V Oscillation Frequency A ver.=3khz typ. B ver.=7khz typ. C ver.=.mhz typ. OCP Operates Oscillation Frequency A ver.=5khz typ. B ver.=7khz typ. C ver.=4khz typ. SW pin ON OFF Switching Current I LIM Pulse by Pulse Pulse Count A ver.=about 7ms B ver.=about 5ms C ver.=about ms Cool Down time :4ms typ. Static Status Detect Overcurrent Soft Start Fig.. Timing Chart at Over Current Detection Thermal Shutdown Function (TSD) When Junction temperature of the NJW43 exceeds the 6 C*, internal thermal shutdown circuit function stops SW function. When junction temperature decreases to 45 C* or less, SW operation returns with soft start operation. The purpose of this function is to prevent malfunctioning of IC at the high junction temperature. Therefore it is not something that urges positive use. You should make sure to operate within the junction temperature range rated (5 C). (* Design value) Standby Function The NJW43 stops the operating and becomes standby status when the EN/SYNC pin becomes less than.5v. The EN/SYNC pin internally pulls down with k, therefore the NJW43 becomes standby mode when the EN/SYNC pin is OPEN. You should connect this pin to V + when you do not use standby function. Ver

16 NJW43 Application Manual Description of Block Features (Continued) External Clock Synchronization By inputting a square wave to EN/SYNC pin, can be synchronized to an external frequency. You should fulfill the following specification about a square wave. (Table.) Table. The input square wave to an EN/SYNC pin. A version (f OSC =3kHz) B version (f OSC =7kHz) C version (f OSC =.MHz) Input Frequency 9kHz to 69kHz to.8mhz to 5kHz,kHz.4MHz Duty Cycle % to 8% 35% to 65% 4% to 6% Voltage magnitude.6v or more at High level.5v or less at Low level The trigger of the switching operating at the external synchronized mode is detected to the rising edge of the input signal. At the time of switching operation from standby or asynchronous to synchronous operation, it has set a delay time approx s to 3 s (@ A ver.), s to s (@ B ver.) and 3 s to 8 s (@ C ver.) in order to prevent malfunctions. (Fig. 3.) High EN/SYNC pin Low SW pin ON OFF Standby Delay Time External Clock Synchronization Fig. 3. Switching Operation by External Synchronized Clock Ver.7--5

17 NJW43 Application NJW43 Manual Application Information Inductors Because a large current flows to the inductor, you should select the inductor with the large current capacity not to saturate. Optimized inductor value is determined by the input voltage and output voltage. The Optimized inductor value: (It is a reference value.) V IN =5V V OUT =V : L < = H You should set the inductor as a guide from above mentioned value to half value. Reducing L decreases the size of the inductor. However a peak current increases and adversely affects the efficiency. (Fig. 4.) Moreover, you should be aware that the output current is limited because it becomes easy to operating to the overcurrent limit. The peak current is decided the following formula. I IN V OUT I V OUT IN A I L V L OUT V V OUT IN f V OSC IN [A] Ipk I IN I L [A] Input Current I IN Current Peak Current I PK Inductor Ripple Current DI L Peak Current I PK Inductor Ripple Current DI L t ON t OFF t ON t OFF Reducing L Value Increasing L value Fig. 4. Inductor Current State Transition (Continuous Conduction Mode) Ver

18 NJW43 Application Manual Application Information (Continued) Catch Diode When the switch element is in OFF cycle, power stored in the inductor flows via the catch diode to the output capacitor. Therefore during each cycle current flows to the diode in response to load current. Because diode's forward saturation voltage and current accumulation cause power loss, a Schottky Barrier Diode (SBD), which has a low forward saturation voltage, is ideal. An SBD also has a short reverse recovery time. If the reverse recovery time is long, through current flows when the switching transistor transitions from OFF cycle to ON cycle. This current may lower efficiency and affect such factors as noise generation. When the switch element is in ON cycle, a reverse voltage flows to SBD. Therefore you should select a SBD that has reverse voltage rating greater than maximum output voltage. The power loss, which stored in output capacitor, will be increase due to increasing reverse current through SBD at high temperature. Therefore, there is cases preferring reverse current characteristics to forward current characteristic in order to improve efficiency. Input Capacitor Transient current flows into the input section of a switching regulator responsive to frequency. If the power supply impedance provided to the power supply circuit is large, it will not be possible to take advantage of the NJW43 performance due to input voltage fluctuation. Therefore insert an input capacitor as close to the MOSFET as possible. Output Capacitor An output capacitor stores power from the inductor, and stabilizes voltage provided to the output. Because NJW43 corresponds to the output capacitor of low ESR, the ceramic capacitor is the optimal for compensation. The Optimized capacitor value: (It is a reference value.) V OUT =V : C OUT > = F In addition, you should consider varied characteristics of capacitor (a frequency characteristic, a temperature characteristic, a DC bias characteristic and so on) and unevenness peculiar to a capacitor supplier enough. Therefore when selecting a capacitors, you should confirm the characteristics with supplier datasheets. When selecting an output capacitor, you must consider Equivalent Series Resistance (ESR) characteristics, ripple current, and breakdown voltage. The output ripple noise can be expressed by the following formula. V ripple (p p) ESR I L [V] The effective ripple current that flows in a capacitor (I rms ) is obtained by the following equation. I rms PK I OUT I [Arms] Ver.7--5

19 NJW43 Application NJW43 Manual Application Information (Continued) Setting Output Voltage, Compensation Capacitor The output voltage V OUT is determined by the relative resistances of R, R. The current that flows in R, R must be a value that can ignore the bias current that flows in ER AMP. V R R OUT V B [V] The zero points are formed with R and C FB, and it makes for the phase compensation of NJW43. The zero point is shown the following formula. f Z R C FB [Hz] You should set the zero point as a guide from khz to 6kHz. Please optimize C FB by application. Ver

20 NJW43 Application Manual Application Information (Continued) Board Layout In the switching regulator application, because the current flow corresponds to the oscillation frequency, the substrate (PCB) layout becomes an important. You should attempt the transition voltage decrease by making a current loop area minimize as much as possible. Therefore, you should make a current flowing line thick and short as much as possible. Fig.5. shows a current loop at Boost converter. L SBD L SBD V IN C IN NJW43 Built-in SW C OUT V IN C IN NJW43 Built-in SW C OUT (a) Boost Converter SW ON (b) Boost Converter SW OFF Fig. 5. Current Loop at Boost Converter Concerning the GND line, it is preferred to separate the power system and the signal system, and use single ground point. The voltage sensing feedback line should be as far away as possible from the inductance. Because this line has high impedance, it is laid out to avoid the influence noise caused by flux leaked from the inductance. Fig. 6. shows example of wiring at boost converter. Fig. 7. shows the PCB layout example. L SBD V OUT SW V IN C IN V + C OUT R L GND The capacitor is connected near an IC. NJW43 R FB C FB IN- Because IN- pin is high impedance, the voltage detection resistance: R/R is put as much as possible near IC(IN-). R R Separate Digital(Signal) GND from Pow er GND To avoid the influence of the voltage drop, the output voltage should be detected near the load. Fig. 6. Board Layout at Boost Converter - - Ver.7--5

21 Application Information (Continued) NJW43 Application NJW43 Manual V OUT V IN SBD L pin C OUT Signal GND Area R C IN Feed back signal R FB C FB R GND OUT EN/SYNC GND IN Power GND Area Connect Signal GND line and Power GND line on backside pattern Fig. 7. Layout Example (upper view) Ver

22 NJW43 Application Manual Calculation of Package Power A lot of the power consumption of boost converter occurs from the internal switching element (Power MOSFET). Power consumption of NJW43 is roughly estimated as follows. Input Power: P IN = V IN I IN [W] Output Power: P OUT = V OUT I OUT [W] Diode Loss: P DIODE = V F I L(avg) OFF duty [W] NJW43 Power Consumption: P LOSS = P IN P OUT P DIODE [W] Where: V IN : Input Voltage for Converter I IN : Input Current for Converter V OUT : Output Voltage of Converter I OUT : Output Current of Converter V F : Diode's Forward Saturation Voltage I L(avg) : Inductor Average Current OFF duty : Switch OFF Duty Cycle Efficiency ( ) is calculated as follows. = (P OUT P IN ) [%] You should consider temperature derating to the calculated power consumption: P D. You should design power consumption in rated range referring to the power dissipation vs. ambient temperature characteristics (Fig. 8). Power Dissipation P D (mw) NJW43U (SOT Package) Power Dissipation vs. Ambient Temperature (Tj=~5 C) At on 4 layer PC Board (*4) At on layer PC Board (*3) (*3): Mounted on glass epoxy board. ( mm:based on EIA/JEDEC standard, Layers) (*4): Mounted on glass epoxy board. ( mm:based on EIA/JEDEC standard, 4Layers) (For 4Layers: Applying mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD5-5) Fig. 8. Power Dissipation vs. Ambient Temperature Characteristics - - Ver.7--5

23 Application Design Examples Boost Converter Application Circuit IC : NJW43U-B Input Voltage : V IN =5V Output Voltage : V OUT =V Output Current : I OUT =4mA Oscillation frequency : fosc=7khz NJW43 Application NJW43 Manual V IN =5V C IN F/5V L H/3.4A SBD C OUT F/6V V OUT =V V + SW C FB 5pF R FB R k NJW43 EN/ SYNC GND IN- R k EN/SYNC High: ON Low: OFF (Standby) Reference Qty. Part Number Description Manufacturer IC NJW43U-B Internal 45V MOSFET SW.REG. IC New JRC L CDRH8D8HPNP-N Inductor H, 3.4A Sumida SBD CMS6 Schottky Diode 4V, 3A Toshiba C IN F Ceramic Capacitor 35 F, 5V, X5R Murata C OUT F Ceramic Capacitor 35 F, 6V, B Murata C FB 5pF Ceramic Capacitor 68 5pF, 5V, CH Std. R FB (Short) Optional R k Resistor 68 k, %,.W Std. R k Resistor 68 k, %,.W Std. Ver

24 NJW43 Application Manual Application Characteristics Efficiency (%) f=7khz L= H Efficiency vs. Output Current (V IN =5V, V OUT =V) Output Voltage V OUT (V) Output Voltage vs. Output Current (V IN =5V) f=7khz L= H. Output Current I OUT (ma). Output Current I OUT (ma) [CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights Ver.7--5