UBA3070 LED backlight driver IC Rev. 3 — 9 December 2010 Product data sheet 1. General description The UBA3070 driver IC is the first member of a first generation of power-efficient LED backlight driver ICs. Highly efficient, flexible and reliable LED drivers can easily be designed using the UBA3070 control IC. 2. Features and benefits Switch-mode buck controller that drives strings of LEDs up to 600 V power-efficiently Controller with power-efficient Boundary Conduction Mode (BCM) operation: Virtually no reverse recovery losses in freewheel diode Zero Current Switching (ZCS) at switch, switch-on Zero voltage or valley switching at switch, switch-on Minimal required inductance value and size Suitable for direct Pulse Width Modulation (PWM) dimming Fast transient response through cycle-by-cycle current control, thereby: Preventing over or undershoots in the Light Emitting Diode (LED) current Enabling efficient PWM dimming by quickly turning the converter on and off and thus removing the need for extra dimming switches and high-side drivers Single controlled input voltage required for all UBA3070 driven LED strings in RGB or white backlighting units No binning on LED forward voltage required Protections: UnderVoltage LockOut (UVLO) Leading Edge Blanking (LEB) OverCurrent Protection (OCP) OverTemperature Protection (OTP) Low cost LED driver solution: No fast-switching Schottky diode required due to ZCS No dimming switch or high-side driver required for PWM dimming Operates with smaller inductor then a comparable fixed-frequency Continuous Conduction Mode (CCM) controller 3. Applications The UBA3070 is suitable for high voltage LED lighting application: LED backlighting in LCD televisions and monitors General lighting applications The UBA3070 application is most efficient when driving long LED strings UBA3070 NXP Semiconductors LED backlight driver IC 4. Ordering information Table 1. Ordering information Type number UBA3070T Package Name Description Version SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1 5. Block diagram VCC 1 8 VALLEY SUPPLY MANAGEMENT DRAIN clamp Iprot(mask) Internal UVLO Start supply 2 GND 4 LOGIC MASK OSCILLATOR 100 mV MASK PROTECTION Iprot(PWM) 3 PWM 6 LOGIC GATE DRIVER Istartup(soft) POWER-ON RESET LEB S soft start S2 Q Blank UVLO OVERTEMPERATURE PROTECTION R 0.5 V Q 5 VCC < 4.5 V S Q R Q − Short winding SENSE 0.5 V 0.88 V 014aaa257 Fig 1. Block diagram of single channel 8-pin LED backlight controller UBA3070 IC UBA3070 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 2 of 16 UBA3070 NXP Semiconductors LED backlight driver IC Vsupply 12 V VCC GND PWM PWM MASK 1 8 2 7 UBA3070 3 6 4 5 DRAIN HVS GATE SENSE 014aaa092 Fig 2. Basic application diagram 6. Pinning information 6.1 Pinning VCC 1 GND 2 8 DRAIN 7 HVS UBA3070 PWM 3 6 GATE MASK 4 5 SENSE 014aaa094 Fig 3. Pin configuration SO8 6.2 Pin description Table 2. UBA3070 Product data sheet Pin description Symbol Pin S08 Description VCC 1 supply voltage GND 2 ground PWM 3 PWM input voltage MASK 4 masking input voltage SENSE 5 resistor programmable current sense input GATE 6 gate driver output HVS 7 high voltage safety spacer: not connected DRAIN 8 drain of external MOSFET switch: input for valley sensing All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 3 of 16 UBA3070 NXP Semiconductors LED backlight driver IC 7. Functional description The UBA3070 is a monolithic driver IC for controlling the current through LED strings e.g. 45 green/blue/white LEDs connected in series making the UBA3070 IC especially suitable as an LED driver. The driver stage enables optimal performance for series connected LED strings in 0D, 1D and 2D segmented Backlight Units (BLUs). Since the UBA3070 drives an external power device, it can be used for all kinds of BLU designs ranging from high-power to low-power LEDs, and high-voltage to low-voltage LED strings. Therefore, the UBA3070 is an excellent driver solution for all types of LEDs and LCD screen sizes. Combining the UBA3070 with suitable power devices means the quantity of drivers can be minimized by optimizing the quantity of series LEDs. Each driver stage consists of a buck converter operating in BCM with its peak level determined by an external sense resistor. Since the peak and zero levels are fixed by design, the converter behaves as a current source. This gives an average LED current throughput that is half the peak value of that through the inductor. The ripple current through the LEDs can be selected by connecting an external capacitor in parallel with the LEDs. 7.1 Supply management and UVLO As long as VCC is below the VCC(startup) level of typically 10 V, the supply current remains below 600 μA. The UBA3070 IC activates the converter as soon as the voltage on the VCC pin passes the VCC(startup) level. When the voltage on VCC pin drops below the UVLO voltage typically 8.7 V the UBA3070 IC stops switching. 7.2 Current control and PWM If the PWM input is HIGH (> 2 V) the converter is disabled and does not switch and, LED current remains at zero. When the PWM input pin is LOW (< 0.5 V) the converter is enabled and operates as follows. The external Field-Effect Transistor (FET) is turned on and current in the inductor begins to build up. During the charging phase of the inductor the current is sensed across an external sense resistor. The internal driver turns off the external FET on detecting a voltage level of 0.52 V at the SENSE pin. The inductor now starts to freewheel its current through the external diode and starts discharging. Following the discharge period the switch node rings. On detection of a valley or zero voltage on the switch node the internal driver turns on the external FET. As the FET is at zero current and minimal voltage, this results in minimal power losses and ElectroMagnetic Interference (EMI). The conversion cycle is repeated as described above, until the PWM input signal is driven high to disable the converter and steers the LED current to zero. If the PWM pin is open circuit or not connected, a fault condition is assumed and the converter stops switching. Operation restarts as soon as the fault condition is removed. UBA3070 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 4 of 16 UBA3070 NXP Semiconductors LED backlight driver IC 7.3 Masking and valley switching The MASK pin ensures that switch-on of the converter is at a valley during ringing and not at a peak during freewheeling of the inductor. If the voltage level at the MASK pin is above 100 mV, then switch-on of the switching FET is prevented. If the voltage level is below 100 mV, then switch-on prevention of the FET is released and at the moment of valley detection the FET is turned on. The signal for the MASK pin can be derived from the signal at the switch node as shown in Figure 2. The current flowing into the MASK pin must be lower than the typical stop current of 60 μA. If the MASK pin is open circuit or not connected, a fault condition is assumed and the converter stops operating immediately. Operation restarts as soon as the fault condition is removed. 7.4 Conversion frequency The maximum conversion frequency of the UBA3070 is limited to 175 kHz. However, due to production spread, the maximum conversion frequency of an individual UBA3070 sample can be as low as 145 kHz. Therefore, an inductance value must be selected so that the applications conversion frequency always remains below 145 kHz after taking into account variations due to the supply voltage, LED string voltage and component spread. There is no limitation for the minimum conversion frequency. 7.5 Minimum on-time The LEB time, typically 370 ns is a fixed delay that determines the minimum on-time of the controller. The LEB time prevents the MOSFET switch from switching off unintentionally (due to coupling to the sense node) directly after the start of a conversion cycle. 7.6 OverCurrent Protection (OCP) As the converter acts as a current source it is self-protected from overcurrent by an extra level of protection, i.e. a second trip level of typically 0.88 V applied to the short-winding/ sense node as shown in Figure 1. This second trip level is designed to protect the convertor against short-circuits in external components e.g. in the diodes, inductors, capacitors and/or LEDs. If a short-circuit is detected the convertor stops switching. 7.7 OverTemperature Protection (OTP) OTP is provided in the UBA3070 IC and functions as follows. When the junction temperature exceeds the thermal shutdown temperature of typically 140 °C the converter stops switching. 7.8 Driver The driver circuit to the gate of the power FET has a current sourcing capability of approximately 135 mA and a current sinking capability of 560 mA. This capability means the FET operates more efficiently with fast switch-on and switch-off cycles. A low driver source current has been chosen to limit the ΔV/Δt at switch-on thereby reducing EMI and voltage spikes across Rsense. UBA3070 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 5 of 16 UBA3070 NXP Semiconductors LED backlight driver IC 8. Limiting values Table 3. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134).[1] Symbol Unit[1] Parameter Conditions Min Max VCC supply voltage current limited −0.4 +20 V VPWM voltage on pin PWM −0.4 +5 V VMASK voltage on pin MASK current limited −0.4 - V VSENSE voltage on pin SENSE current limited −0.4 - V VDRAIN voltage on pin DRAIN −0.4 +650 V 5 mA −250 +250 μA −1 +10 mA −0.8 +2 A - 5 mA Voltages Currents IPWM current on pin PWM IMASK current on pin MASK ISENSE current on pin SENSE IGATE current on pin GATE IDRAIN current on pin DRAIN - d < 10 % General Tamb < 70 °C Ptot total power dissipation 0.5 W Tstg storage temperature −55 - +150 °C Tj junction temperature −40 +145 °C ESD VESD electrostatic discharge voltage - - - all pins except pins DRAIN and VCC; HBM class 1 [2] - 2000 V pins DRAIN and VCC; HBM class 1 [2] - 1500 V any pin; MM [3] - 200 V [1] All voltages are measured with respect to ground; positive currents flow into the UBA3070 IC. The VCC pin may not be current driven. The voltage ratings are valid provided other ratings are not violated. The current ratings are valid provided the maximum power rating is not violated. [2] Human Body Model (HBM): equivalent to discharging a 100 pF capacitor through a 1.5 kΩ resistor. [3] Machine Model (MM): equivalent to discharging a 200 pF capacitor through a 0.75 μH coil and a 10 Ω resistor. 9. Thermal characteristics Table 4. UBA3070 Product data sheet Thermal characteristics Symbol Parameter Conditions Typ Unit Rth(j-a) thermal resistance from junction to ambient in free air 150 K/W All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 6 of 16 UBA3070 NXP Semiconductors LED backlight driver IC 10. Characteristics Table 5. Characteristics Tamb = 25 ° C; VCC = 15 V; all voltages are measured with respect to ground; currents are positive when flowing into the UBA3070 IC; unless otherwise specified. Symbol Parameter VBR breakdown voltage Conditions Min Typ Max Unit 650 - - V Supply voltage management (VCC pin) VCC(startup) start-up supply voltage 9.3 10 10.6 V VCC(UVLO) undervoltage lockout supply voltage 8.1 8.7 9.3 V VCC(hys) hysteresis of supply voltage VCC(startup) − VCC(UVLO) 1.0 1.3 1.6 V ICC(oper) operating supply current no load on GATE pin 1.1 1.3 1.5 mA ICC(startup) start-up supply current VCC < VCC(startup) - - 600 μA ICC(prot) protection supply current VCC > VCC(UVLO) - 0.85 - mA 50 100 150 mV Masking management (MASK pin) Vth(MASK) threshold voltage on pin MASK Vclamp(neg)(MASK) negative clamp voltage on pin MASK IMASK = −150 μA −0.5 −0.25 −0.05 V Vclamp(pos)(MASK) positive clamp voltage on pin MASK IMASK = 250 μA 0.5 0.7 0.9 V 54 60 66 μA Istop(pos)(MASK) positive stop current on pin MASK tsup(xfmr_ring) transformer ringing suppression time start secondary stroke 1.1 1.5 1.9 μs Iprot(MASK) protection current on pin MASK VMASK = 50 mV −50[1] - −10 nA high oscillator frequency VPWM is LOW 145 175 205 kHz [2] - - 0.5 V [2] 2.0 - - V −1.0[1] −0.8 −0.5 μA Oscillator fosc(high) PWM duty cycle control (PWM pin) VIL(en)ILED(PWM) LED current enable LOW-level input voltage on pin PWM VIH(dis)ILED(PWM) LED current disable HIGH-level input voltage on pin PWM Iprot(PWM) protection current on pin PWM VPWM = 1.5 V Valley switch (DRAIN pin) (ΔV/Δt)vrec valley recognition voltage change with time −85 - +85 V/μs td(vrec-swon) valley recognition to switch-on delay time - 150[1] - ns OCP (SENSE pin) Vsense(max) maximum sense voltage ΔV/Δt = 0.1 V/μs 0.48 0.52 0.56 V tPD propagation delay ΔV/Δt = 0.5 V/μs - 140 185 ns Vswp short-winding protection voltage 0.83 0.88 0.95 V tleb leading edge blanking time 300 370 440 ns Istartup(soft) soft startup current 45 60 75 μA UBA3070 Product data sheet Rsense < 0.5 V All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 7 of 16 UBA3070 NXP Semiconductors LED backlight driver IC Table 5. Characteristics …continued Tamb = 25 ° C; VCC = 15 V; all voltages are measured with respect to ground; currents are positive when flowing into the UBA3070 IC; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit Driver (GATE pin) Isource source current VCC = 9.5 V; VGATE = 2 V - −135 - mA Isink sink current VCC = 9.5 V; VGATE = 2 V - 240 - mA VCC = 9.5 V; VGATE = 9.5 V - 560 - mA VCC > 12 V - 11.5 12 V Vo(max) maximum output voltage OTP Tpl(max) maximum protection level temperature 130 140 150 °C Tpl(hys) protection level hysteresis temperature - 8 - °C [1] Guaranteed by design. [2] When the voltage at the PWM pin is between 0.5 V to 2.0 V the peak current and the frequency is reduced. UBA3070 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 8 of 16 UBA3070 NXP Semiconductors LED backlight driver IC 11. Package outline SO8: plastic small outline package; 8 leads; body width 3.9 mm SOT96-1 D E A X c y HE v M A Z 5 8 Q A2 A (A 3) A1 pin 1 index θ Lp L 4 1 e detail X w M bp 0 2.5 5 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (2) e HE L Lp Q v w y Z (1) mm 1.75 0.25 0.10 1.45 1.25 0.25 0.49 0.36 0.25 0.19 5.0 4.8 4.0 3.8 1.27 6.2 5.8 1.05 1.0 0.4 0.7 0.6 0.25 0.25 0.1 0.7 0.3 0.069 0.010 0.057 0.004 0.049 0.01 0.019 0.0100 0.014 0.0075 0.20 0.19 0.16 0.15 0.05 0.01 0.01 0.004 0.028 0.012 inches 0.244 0.039 0.028 0.041 0.228 0.016 0.024 θ o 8 o 0 Notes 1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included. 2. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included. Fig 4. REFERENCES OUTLINE VERSION IEC JEDEC SOT96-1 076E03 MS-012 JEITA EUROPEAN PROJECTION ISSUE DATE 99-12-27 03-02-18 Package outline SOT96-1 (SO8) UBA3070 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 9 of 16 UBA3070 NXP Semiconductors LED backlight driver IC 12. Abbreviations Table 6. Abbreviations Acronym Description BCM Boundary Conduction Mode BLU Backlight Unit CCM Continuous Conduction Mode EMI ElectroMagnetic Interference FET Field-Effect Transistor HBM Human Body Model IC Integrated Circuit LCD Liquid Crystal Display LEB Leading Edge Blanking LED Light Emitting Diode MM Machine Model MOSFET Metal-Oxide Semiconductor Field-Effect Transistor OCP OverCurrent Protection OTP OverTemperature Protection PWM Pulse Width Modulation RGB Red/Green/Blue UVLO UnderVoltage LockOut ZCS Zero Current Switching 13. References [1] UBA3070 Product data sheet UM10400 — UBA3070 V1.2 demo board All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 10 of 16 UBA3070 NXP Semiconductors LED backlight driver IC 14. Revision history Table 7. Revision history Document ID Release date Data sheet status Change notice Supersedes UBA3070 v.3 20101209 Product data sheet - UBA3070 v.2 - UBA3070 v.1 Modifications: UBA3070 v.2 Modifications: UBA3070 v.1 UBA3070 Product data sheet • Minor updates. 20080212 • Product data sheet The minimum value for junction temperature has been updated in Table 3. 20080605 Product data sheet - All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 - © NXP B.V. 2010. All rights reserved. 11 of 16 UBA3070 NXP Semiconductors LED backlight driver IC 15. Legal information 15.1 Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification. [1] Please consult the most recently issued document before initiating or completing a design. [2] The term ‘short data sheet’ is explained in section “Definitions”. [3] The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status information is available on the Internet at URL http://www.nxp.com. 15.2 Definitions Draft — The document is a draft version only. The content is still under internal review and subject to formal approval, which may result in modifications or additions. NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information. Short data sheet — A short data sheet is an extract from a full data sheet with the same product type number(s) and title. A short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. For detailed and full information see the relevant full data sheet, which is available on request via the local NXP Semiconductors sales office. In case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. 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NXP Semiconductors accepts no liability for inclusion and/or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer’s own risk. Applications — Applications that are described herein for any of these products are for illustrative purposes only. NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products, and NXP Semiconductors accepts no liability for any assistance with applications or customer product design. It is customer’s sole responsibility to determine whether the NXP Semiconductors product is suitable and fit for the customer’s applications and products planned, as well as for the planned application and use of customer’s third party customer(s). Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. NXP Semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer’s applications or products, or the application or use by customer’s third party customer(s). Customer is responsible for doing all necessary testing for the customer’s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer’s third party customer(s). NXP does not accept any liability in this respect. Limiting values — Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent damage to the device. Limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the Recommended operating conditions section (if present) or the Characteristics sections of this document is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. Terms and conditions of commercial sale — NXP Semiconductors products are sold subject to the general terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms, unless otherwise agreed in a valid written individual agreement. In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. NXP Semiconductors hereby expressly objects to applying the customer’s general terms and conditions with regard to the purchase of NXP Semiconductors products by customer. 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Export might require a prior authorization from national authorities. UBA3070 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 12 of 16 UBA3070 NXP Semiconductors LED backlight driver IC Quick reference data — The Quick reference data is an extract of the product data given in the Limiting values and Characteristics sections of this document, and as such is not complete, exhaustive or legally binding. Non-automotive qualified products — Unless this data sheet expressly states that this specific NXP Semiconductors product is automotive qualified, the product is not suitable for automotive use. It is neither qualified nor tested in accordance with automotive testing or application requirements. NXP Semiconductors accepts no liability for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. In the event that customer uses the product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without NXP Semiconductors’ warranty of the product for such automotive applications, use and specifications, and (b) whenever customer uses the product for automotive applications beyond NXP Semiconductors’ specifications such use shall be solely at customer’s own risk, and (c) customer fully indemnifies NXP Semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond NXP Semiconductors’ standard warranty and NXP Semiconductors’ product specifications. 15.4 Trademarks Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. 16. Contact information For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: [email protected] UBA3070 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 13 of 16 UBA3070 NXP Semiconductors LED backlight driver IC 17. Tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Ordering information . . . . . . . . . . . . . . . . . . . . .2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . .3 Limiting values . . . . . . . . . . . . . . . . . . . . . . . . . .6 Thermal characteristics . . . . . . . . . . . . . . . . . . .6 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . .7 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . .10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . 11 continued >> UBA3070 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 14 of 16 UBA3070 NXP Semiconductors LED backlight driver IC 18. Figures Fig 1. Fig 2. Fig 3. Fig 4. Block diagram of single channel 8-pin LED backlight controller UBA3070 IC . . . . . . . . . . . . . .2 Basic application diagram . . . . . . . . . . . . . . . . . . .3 Pin configuration SO8 . . . . . . . . . . . . . . . . . . . . . .3 Package outline SOT96-1 (SO8) . . . . . . . . . . . . . .9 continued >> UBA3070 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 9 December 2010 © NXP B.V. 2010. All rights reserved. 15 of 16 UBA3070 NXP Semiconductors LED backlight driver IC 19. Contents 1 2 3 4 5 6 6.1 6.2 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 8 9 10 11 12 13 14 15 15.1 15.2 15.3 15.4 16 17 18 19 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features and benefits . . . . . . . . . . . . . . . . . . . . 1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Ordering information . . . . . . . . . . . . . . . . . . . . . 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Pinning information . . . . . . . . . . . . . . . . . . . . . . 3 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3 Functional description . . . . . . . . . . . . . . . . . . . 4 Supply management and UVLO . . . . . . . . . . . . 4 Current control and PWM . . . . . . . . . . . . . . . . . 4 Masking and valley switching . . . . . . . . . . . . . . 5 Conversion frequency. . . . . . . . . . . . . . . . . . . . 5 Minimum on-time . . . . . . . . . . . . . . . . . . . . . . . 5 OverCurrent Protection (OCP) . . . . . . . . . . . . . 5 OverTemperature Protection (OTP) . . . . . . . . . 5 Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6 Thermal characteristics . . . . . . . . . . . . . . . . . . 6 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Package outline . . . . . . . . . . . . . . . . . . . . . . . . . 9 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 10 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . 11 Legal information. . . . . . . . . . . . . . . . . . . . . . . 12 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 12 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Contact information. . . . . . . . . . . . . . . . . . . . . 13 Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Please be aware that important notices concerning this document and the product(s) described herein, have been included in section ‘Legal information’. © NXP B.V. 2010. All rights reserved. For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: [email protected] Date of release: 9 December 2010 Document identifier: UBA3070