UP1707P

UP1707P UPI | Alldatasheet

Document overview

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Technical content

Features

Note: uPI products are compatible with the current IPC/ JEDEC J-STD-020 requirement. They are halogen-free, RoHS compliant and 100% matte tin (Sn) plating that are suitable for use in SnPb or Pb-free soldering processes. The uP1707P is a high-efficiency synchronous-rectified buck converter with internal power switch. With internal low RDS(ON) switches, the high-efficiency buck converter is capable of delivering 3A output current over a wide input voltage range from 4.5V to 23V. The output voltage is adjustable from 0.925V to 20V by a voltage divider. Other features for the buck converter include adjust soft-start, chip enable, over-voltage, under-voltage, over- temperature and over-current protections. It is available in a space saving PSOP-8L package. GND PSOP - 8 VIN LX BOOT GND COMP EN SS FB Pin Configuration

2uPI Semiconductor Corp., http://www.upi-semi.com Rev. P00, File Name: uP1707P-DS-P0000 Typical Application Circuit TUOV1 L1 R2 R3 R6 C V3.3H u01k 1.62 Ω k01 Ω k8.6 Ω Fn9.3 V0.5H u51k 3.54 Ω k01 Ω k31 Ω Fn9.3 V8H u22k 8.67 Ω k01 Ω k51 Ω Fn9.3 V01H u22k 6.79 Ω k01 Ω k02 Ω Fn9.3 V51H u33k 351 Ω k01 Ω k03 Ω Fn9.3 2 1 BOOT FB COMP SS VIN 4.5V~23V VOUT VIN GND 10uFx2 EN 100K LX 0.1uF 0.1uF 10nF 0.1uF 22uFx2 Option Option

3uPI Semiconductor Corp., http://www.upi-semi.com Rev. P00, File Name: uP1707P-DS-P0000 .oNniPe maNniPn oitcnuFniP 1T OOB .revirDetaGreppUgnitaolFehtrofylppuSpartstooB roticapacpartstoobehttcennoC C TOOB roticapacpartstoobehT.tiucricpartstoobamrofotnipXLehtdnanipTOOBneewteb CrofeulavlacipyT.TEFSOMreppuehtnonrutotegrahcehtsedivorp TOOB .retaergroFn01si CtahterusnE TOOB .CIehtraendecalpsi 2N IV .tupnIylppuSrewoP ehtsrewopdnaegatlovtuptuoehtottnerrucseilppustahtegatlovtupnI cimarecR7XroR5X2xFu01muminimahtiwegatlovtupniehtssapyB.tiucriclortnoclanretni .roticapac 3X L .tuptuOsehctiwSlanretnI .rotcudnituptuoehtotnipsihttcennoC 4D NG .dnuorG .retrevnockcubehtfodnuorG 5B F .egatloVkcabdeeFrehctiwS sesnesBF.reifilpmarorreehtfotupnignitrevniehtsinipsihT .krowtenredividrotsiserlanretxenahguorhttuptuorehctiwseht 6P MOC .noitasnepmoC dlohserhtrotarapmoctnerrucehT.reifilpmarorreehtfotuptuosinipsihT poollortnocrofdnuorgotkrowtenCRnatcennoC.egatlovlortnocsihthtiwsesaercni .noitasnepmoc 7N E .)hgiHevitcA(elbanEretrevnoCkcuB .retrevnocehtnwodstuhswolcigoL 8S S .niPlortnoCtratS-tfoS CroticapactratstfosatcennoC SS -tfosonrofnepoevaeL.nipsihtot .wolsinipNEnehwdnuorgotdegrahcsidsiroticapactratstfosehT.noitacilppatrats daPdesopxE .dnuorGrewoP llewebdluohsdnanoitcevnoctaehrofhtapylniamehtsidapdesopxeehT .ecnamrofreplamrehttsebrofBCPehtotderedlos Functional Pin Description Functional Block Diagram SS Control Logic Driver Current SenseCurrent Limit Detector Over/Under Voltage Protection Slope Compensation OSC & Shutdown Control VREF EN GND VIN LX FB 6uA COMP BOOT

current over a wide input voltage range from 4.5V to 23V. temperature and over-current protections. recommended for bypassing the supply input. enables the buck converter and initiates the soft start cycle. with a threshold voltage of NMOSFET . Figure 1. uP1707P Soft Start easily smoothed by the output filter. get appropriate COMP pin voltage. matches the new load current.

5uPI Semiconductor Corp., http://www.upi-semi.com Rev. P00, File Name: uP1707P-DS-P0000 retemaraPl obmySs noitidnoCtseTn iMp yTx aMs tinU tnerruCylppuS tnerruCylppuSV NE V,V0.3= BF V0.1=- -3 .15 .1A m tnerruCylppuSnwodtuhSV NE V0=- -3 .03 A u dlohserhTtuokcoLegatloVrednUtupnIV NI gnisir8 .30 .42 .4V dlohserhTtuokcoLegatloVrednUtupnI siseretsyH --0 06- -V m ecnerefeR egatloVkcabdeeFV BF V<V57.4 NI V32<1 19.05 29.09 39.0V niaGegatloVreifilpmArorrEA EA- -0 04- -V /V ecnatcudnocsnarTreifilpmArorrEA EG Δ Au01-/+=CI- -0 28- -V /Au esneStnerruCotPMOC ecnatcudnocsnarT SCG- -5 .4- -V /A LX Pin Voltage ESD Rating (Note 2) (VIN = 12V, TA = 25OC, unless otherwise specified) Absolute Maximum Rating Thermal Information Recommended Operation Conditions

Electrical Characteristics

Package Thermal Resistance (Note 3) Power Dissipation, PD @ TA = 25°C

6uPI Semiconductor Corp., http://www.upi-semi.com Rev. P00, File Name: uP1707P-DS-P0000 retemaraPl obmySs noitidnoCtseTn iMp yTx aMs tinU sehctiwSrewoP nOhctiwSediS-ediH ecnatsiseR R )NO(SD --0 01- -m Ω ecnatsiseRnOhctiwSediS-woLR )NO(SD --0 01- -m Ω egakaeLhctiwSediS-hgiH tnerruC V NE V,V0= WS V0=- -00 1A u timiLtnerruChctiwSreppUe lcyCytuDmuminiM4 5 .5- -A timiLtnerruChctiwSrewoLe cruoSotniarDmorF- -3 .1- -A rotallicsO ycneuqerFnoitallicsO1 CSOF0 030 430 83z Hk noitallicsOtiucriCtrohS ycneuqerF 2CSOFV BF V0=- -0 11- -z Hk elcyCytuDmumixaMX AMDV BF V0.1=- -0 9- -% emiTnOmuminiMN OT- -0 22- -s n tupnIcigoL egatloVdlohserhTnwodtuhSNEV NE gnisiR0 .22 .24 .2V siseretsyHegatloVnwodtuhSNE --0 52- -V m egatloVdlohserhTtuokcoLNE 5.27 .29 .2V siseretsyHegatloVtuokcoLNE --0 54- -V m tratStfoS tnerruCtratS-tfoSV SS V0=5 .50 .65 .6A u doireptratS-tfoSC SS Fu1.0=- -5 1- -s m noitcetorP noitcetorPegatloVrevOBF --1 .1- -V noitcetorPerutarepmeT-revO --0 61- - OC siseretsyHerutarepmeT-revO --0 3- - OC Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 4. The device is not guaranteed to function outside its operating conditions.

7uPI Semiconductor Corp., http://www.upi-semi.com Rev. P00, File Name: uP1707P-DS-P0000 VIN (5V/Div) ILX (2A/Div) VOUT (2V/Div) LX (10V/Div) VIN (5V/Div) ILX (1A/Div) VOUT (2V/Div) LX (10V/Div) VIN (5V/Div) ILX (2A/Div) VOUT (2V/Div) LX (10V/Div) VIN (5V/Div) ILX (2A/Div) VOUT (2V/Div) LX (10V/Div) VIN (10V/Div) ILX (2A/Div) VOUT (2V/Div) LX (10V/Div) VIN (10V/Div) ILX (2A/Div) VOUT (2V/Div) LX (10V/Div) Typical Operation Characteristics Turn On Waveforms 5ms/Div VIN = 12V, VOUT = 3.3V, IOUT = 0A Turn On Waveforms 5ms/Div VIN = 12V, VOUT = 3.3V, IOUT = 3A Turn Off Waveforms 10ms/Div VIN = 12V, VOUT = 3.3V, IOUT = 0A Turn Off Waveforms 50us/Div VIN = 12V, VOUT = 3.3V, IOUT = 3A Power On Waveforms 5ms/Div VIN = 12V, VOUT = 3.3V, IOUT = 0A Power On Waveforms 5ms/Div VIN = 12V, VOUT = 3.3V, IOUT = 3A

8uPI Semiconductor Corp., http://www.upi-semi.com Rev. P00, File Name: uP1707P-DS-P0000 330 340 350 360 370 380 390 3.35 3.36 3.37 3.38 3.39 3.40 3.41 3.42 3.43 3.44 3.45 VIN = 4.75V VIN = 23V VIN = 12V 100 0 1000 2000 3000 VIN = 4.7V VIN = 12V VIN = 19V VIN (200mV/Div) ILX (1A/Div) VOUT (20mV/Div) LX (10V/Div) VIN (10mV/Div) ILX (1A/Div) VOUT (10mV/Div) LX (10V/Div) Steady State Waveforms 5us/Div VIN = 12V, VOUT = 3.3V, IOUT = 0A Power On Waveforms 2us/Div VIN = 12V, VOUT = 3.3V, IOUT = 3A Typical Operation Characteristics Output Voltage vs. Output Current Output Current (A) Output Voltage (V) Efficiency vs. Output Current Output Current (mA) Efficiency (%) Frequency vs. Output Current Output Current (A) Frequency (kHz)

9uPI Semiconductor Corp., http://www.upi-semi.com Rev. P00, File Name: uP1707P-DS-P0000

Application Information

Output inductor selection is usually based the considerations of inductance, rated current value, size requirements and DC resistance (DCR). The inductance is chosen based on the desired ripple current. Large value inductors result in lower ripple currents and small value inductors result in higher ripple currents. Higher V IN or V OUT also increases the ripple current as shown in the equation below. A reasonable starting point for setting ripple current is ΔIL = 900mA (30% of 3000mA). For most applications, the value of the inductor will fall in the range of 1uH to 10uH. V1(VLf IN OUT OUT OUTOSC Maximum current ratings of the inductor are generally specified in two methods: permissible DC current and saturation current. Permissible DC current is the allowable DC current that causes 40 OC temperature raise. The saturation current is the allowable current that causes 10% inductance loss. Make sure that the inductor will not saturate over the operation conditions including temperature range, input voltage range, and maximum output current. If possible, choose an inductor with rated current higher than 5.5A so that it will not saturate even under current limit condition. The size requirements refer to the area and height requirement for a particular design. For better efficiency, choose a low DC resistance inductor. DCR is usually inversely proportional to size. Different core materials and shapes will change the size, current and price/current relationship of an inductor. Toroid or shielded pot cores in ferrite or permalloy materials are small and don’t radiate much energy, but generally cost more than powdered iron core inductors with similar electrical characteristics. The choice of which style inductor to use often depends on the price vs. size requirements and any radiated field/EMI requirements. Input Capacitor Selection The buck converter draws pulsed current with sharp edges from the input capacitor resulting in ripple and noise at the input supply voltage. A minimum 10uFx2 X5R or X7R ceramic capacitor is highly recommended to filter the pulsed current. The input capacitor should be placed as near the device as possible to avoid the stray inductance along the connection trace. Y5V dielectrics, aside from losing most of their capacitance over temperature, they also become resistive at high frequencies. This reduces their ability to filter out high frequency noise. The capacitor with low ESR (equivalent series resistance) provides the small drop voltage to stabilize the input voltage during the transient loading. For input capacitor selection, the ceramic capacitor larger than 10uFx2 is recommend. The capacitor must conform to the RMS current requirement. The maximum RMS ripple current is calculated as: IN OUTINOUT )MAX(OUT)RMS(IN V )VV(VII  This formula has a maximum at V IN = 2xV OUT, where IIN(RMS) = IOUT(MAX)/2. This simple worst-case condition is commonly used for design because even significant deviations do not offer much relief. Note that the capacitor manufacturer’s ripple current ratings are often based on 2000 hours of life. This makes it advisable to further derate the capacitor, or choose a capacitor rated at a higher temperature than required. Always consult the manufacturer if there is any question. Output Capacitor Selection The integrated buck converter is specifically design to operate with minimum 22uFx2 X5R or X7R ceramic capacitor. The value can be increased to improve load/ line transient performance. Y5V dielectrics, aside from losing most of their capacitance over temperature, they also become resistive at high frequencies. This reduces their ability to filter out high frequency noise. The ESR of the output capacitor determines the output ripple voltage and the initial voltage drop following a high slew rate load transient edge. The output ripple voltage can be calculated as: )Cf8 1ESR(IV TOUOSC where f OSC = operating frequency, C OUT = output capacitance and ΔIC = ΔIL = ripple current in the inductor. The ceramic capacitor with low ESR value provides the low output ripple and low size profile. Connect a 1uF/10uF ceramic capacitor at output terminal for good performance and place the input and output capacitors as close as possible to the device. Using Ceramic Capacitors Higher value, lower cost ceramic capacitors are now available in smaller case sizes. Their high ripple current, high voltage rating and low ESR make them ideal for switching regulator applications. Because the control loop does not depend on the output capacitor’s ESR for stable operation, ceramic capacitors can be used to achieve very low output ripple and small circuit size.

10uPI Semiconductor Corp., http://www.upi-semi.com Rev. P00, File Name: uP1707P-DS-P0000 However, care must be taken when these capacitors are used at the input and the output. When a ceramic capacitor is used at the input and the power is supplied by a wall adapter through long wires, a load step at the output can induce ringing at the input, V IN. At best, this ringing can couple to the output and be mistaken as loop instability. At worst, a sudden inrush of current through the long wires can potentially cause a voltage spike at V IN, large enough to damage the part. When choosing the input and output ceramic capacitors, choose the X5R or X7R dielectric formulations. These dielectrics have the best temperature and voltage characteristics of all the ceramics for a given value and size. Checking Transient Response The regulator loop response can be checked by looking at the load transient response. Switching regulators take several cycles to respond to a step in load current. When a load step occurs, V OUT immediately shifts by an amount equal to (ΔIOUT x ESR), where ESR is the effective series resistance of C OUT. ΔIOUT also begins to discharge or charge COUT, which generates a feedback error signal. The regulator loop then acts to return V OUT to its steady state value. During this recovery time V OUT can be monitored for overshoot or ringing that would indicate a stability problem.

11uPI Semiconductor Corp., http://www.upi-semi.com Rev. P00, File Name: uP1707P-DS-P0000

Package Information

1.Package Outline Unit Description: BSC: Basic. Represents theoretical exact dimension or dimension target MIN: Minimum dimension specified. MAX: Maximum dimension specified. REF: Reference. Represents dimension for reference use only. This value is not a device specification. TYP. Typical. Provided as a general value. This value is not a device specification. 2.Dimensions in Millimeters. 3.Drawing not to scale. 4.These dimensions no not include mold flash or protrusions. Mold flash or protrusions shell not exceed 0.15mm. PSOP-8L 0.32 - 0.52 4.80 - 5.00 5.80 - 6.20 0.18 - 0.25 0.40 - 0.90

1.27 BSC

3.80 - 4.00 Recommended Solder Pad Layout 1.90 - 2.45 2.60 - 3.40 7.00 10±0. 1.50 10±0. 5.50 10±0. 4.00 10±0 . 2.30 ± 100. 3.20 10± 0.

3.81 BSC

0.05 - 0.25

1.75 MAX

1.45 - 1.60