SP6648EU-L

SP6648EU-L SIPEX | Alldatasheet

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Technical content

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation SP6648

FEATURES

■ Ultra-low 12μA Quiescent Current ■ 400mA Output Current at 2.6V Input: 3.3VOUT ■ 94% Efficiency from 2 Cell to 3.3V OUT ■ Wide Input Operating Voltage: 0.85V to 4.5V ■ 3.3V Fixed or Adjustable Output ■ Integrated Synchronous Rectifier: 0.3 Ω ■ 0.3Ω Switch ■ Anti-Ringing Switch Technology ■ Programmable Inductor Peak Current ■ Logic Shutdown Control ■ Under Voltage Lock-Out at 0.61V ■ Programmable Low-Battery Detect ■ Single or Dual Cell Alkaline ■ Small 10 pin DFN Package and Industry Standard 10 pin MSOP Ultra-low Quiescent Current, High Efficiency Boost Regulator

APPLICATIONS

■ Camera Flash LED Driver ■ Wireless Mouse ■ PDA's ■ Pagers ■ Medical Monitors ■ Handheld Portable Devices ■ MP3 Players

DESCRIPTION

The SP6648 is an ultra-low quiescent current, high efficiency step-up DC-DC converter ideal for single cell, dual cell alkaline and Li-Ion battery applications such as digital still cameras, PDAs, MP3 players, and other portable devices. The SP6648 combines the high-load efficiency associated with PWM control, with the low quiescent current and excellent light-load efficiency of PFM control. The SP6648 features 12μA quiescent current, synchronous rectification, a 0.3Ω charging switch, anti-ringing inductor switch, programmable low-battery detect, under-voltage lockout and programmable inductor peak current. The device can be controlled by a 1nA active LOW shutdown pin. 205K 10μH 3.3VOUT VBATT 47μF SP6648 VBATT LBON RLIM SHDN FB LXLBI VOUT PGND GND 47pF 47μF 1μF LBI SHDN 1.87K LBON 124K TYPICAL APPLICATION CIRCUIT 100 150 200 250 300 350 400 450 500 Vin (V) Io (mA) Vout=3.3V, Ipk=0.85A Vout=5.0V, Ipk=0.85A Maximum Load Current in Operation SP6648

10 Pin DFN

Now Available in Lead Free Packaging

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation PARAMETER MIN TYP MAX UNITS ♦ CONDITIONS Input Voltage Operating Range, VBATT 0.7 4.5 V ♦ After Startup Output Voltage Range, VOUT 2.5 5.5 V ♦ Start-up Input Voltage, VBATT 0.85 1.1 V ♦ RLOAD = 3kΩ Under Voltage Lock-out/UVLO 0.5 0.61 0.7 V ♦ Output Voltage, VO 3.12 3.30 3.48 V ♦ Internal Feedback Divider Quiescent Current into VO, IQO 12 25 μA ♦ VOUT = 3.3V, VFB = 1.5V, Toggle SHDN Quiescent Current into VBATT, IQB 250 750 nA ♦ VOUT = 3.3V, VFB = 1.5V Shutdown Current into VO, ISDO 1 500 nA ♦ VSHDN = 0.0V Shutdown Current into VBATT, ISDB 250 750 nA ♦ VSHDN = 0.0V, VBATT = 2.6V Efficiency 84 % V BATT = 1.3V, IOUT = 100mA, RLIM =2kΩ 92 % V BATT = 2.6V, IOUT = 200mA, RLIM =2kΩ Inductor Current Limit, IPK = 1600/RLIM 650 800 1000 mA ♦ RLIM = 2kΩ 1300 1600 2000 mA ♦ RLIM = 1kΩ 100 mA V BATT = 1.3V, RLIM = 4kΩ Output Current 200 mA V BATT = 2.6V, RLIM = 4kΩ 150 mA V BATT = 1.3V, RLIM =2kΩ 400 mA V BATT = 2.6V, RLIM =2kΩ Minimum Off-Time Constant KOFF 0.5 1.0 1.5 V* μs ♦ KOFF ≤ TOFF (VOUT- VBATT) Maximum On-Time Constant KON 2.5 4.0 5.5 V* μs ♦ KON ≥ TON (VBATT) Enable Valid to Output Stable 300 500 μsI LOAD = 1mA NMOS Switch Resistance 0.30 0.6 Ω♦ INMOS = 100mA PMOS Switch Resistance 0.30 0.6 Ω♦ IPMOS = 100mA FB Set Voltage, VFB 1.19 1.25 1.31 V ♦ External feedback FB Input Current 1 100 nA ♦ VFB =1.3V LBI Falling Trip Voltage 0.56 0.61 0.66 V ♦ LBI Hysteresis 25 mV Low Output Voltage for LBON, VOL 0.4 V ♦ VBATT = 1.3V, ISINK = 1mA Leakage current for LBON 1 μA ♦ VBATT = 1.3V, VLBON = 3.3V SHDN Input Voltage, Note 1 VIL 0.25 ♦ VBATT = 1.3V VIH 1.0 V ♦ VBATT = 1.3V VIL 0.5 ♦ VBATT = 2.6V VIH 2.0 ♦ VBATT = 2.6V SHDN Input Current 1 100 nA ♦ LX Pin Leakage 3 μA ELECTRICAL SPECIFICATIONS VBATT =VSHDN = 2.6V, VFB=0.0V, ILOAD = 0mA, TAMB = -40°C to +85°C, VOUT = +3.3V, typical values at 27°C unless otherwise noted. The ♦ denotes the specifications which apply over full operating temperature range -40°C to +85°C, unless otherwise specified. These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. ABSOLUTE MAXIMUM RATINGS Note 1: SHDN must transition faster than 1V/100mS for proper operation.

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation PIN DESCRIPTION PIN NUMBER PIN NAME DESCRIPTION 1V BATT Battery Voltage. The startup circuitry is powered by this pin. Battery Voltage is used to calculate switch off time: tOFF = KOFF/ (VOUT - VBATT). When the battery voltage drops below 0.61V the SP6648 goes into an undervoltage lockout mode (UVLO), where the part is shut down. 2 LBI Low Battery Input. LBI below 0.61V causes the SP6648 pin to pull LBON pin down to ground. Use a resistor divider to program the low voltage threshold for a specific battery configuration. 3 LBON Low Battery Output Not. Open drain NMOS output that sinks current to ground when LBI is below 0.61V. 4R LIM Current Limit Resistor. By connecting a resistor R LIM from this pin to ground the inductor peak current is set by IPEAK=1600/RLIM. The range for RLIM is 9kΩ (for 180mA) to 1.KΩ (for 1.6A). 5 SHDN Shutdown Not. Tie this pin high to V BATT, for normal operation. Pull this pin to ground to disable all circuitry inside the chip. In shutdown the output voltage will float down to a diode drop below the battery voltage. 6 FB Feedback. Connect this pin to GND for fixed +3.3V operation. Connect this pin to a resistor voltage divider between V OUT and GND for adjustable output operation. 7 GND Ground. Connect to ground plane. 8 PGND Power Ground. The inductor charging current flows out of this pin. 9 LX Inductor Switching Node. Connect one terminal of the inductor to the positive terminal of the battery. Connect the second terminal of the inductor to this pin. The inductor charging current flows into LX, through the internal charging N-channel FET, and out the PGND pin. 10 V OUT Output Voltage. The inductor current flows out of this pin during switch off-time. It is also used as the internal regulator voltage supply. Connect this pin to the positive terminal of the output capacitor.

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation THEORY OF OPERATION Detailed Description The SP6648 is a step-up DC-DC converter that can start up with input voltages as low as 0.85V (typically) and operates with an input voltage down to 0.61V. Ultra low quiescent current of 12μA provides excellent efficiency, up to 94%. In addition to the main switch, a 0.3 Ω internal MOSFET the SP6648 has an internal synchro- nous rectifier, increasing efficiency and reduc- ing the space requirements of an external diode. An internal inductive-damping switch signifi- cantly reduces inductive ringing for low-noise, high efficiency operation. If the supply voltage drops below 0.61V the SP6648 goes into under voltage lock-out mode, thus opening both inter- nal switches. An externally programmable low battery detector with open drain output provides the ability to flag a battery-low condition. The inductor peak current is externally program- mable to allow for a range of inductor values. Control Scheme A minimum off-time, current limited pulse fre- quency modulation (PFM) control scheme com- bines the high output power and efficiency of a pulse width modulation (PWM) device with the ultra low quiescent current of the traditional PFM. At low to moderate output loads, the PFM control provides higher efficiency than tradi- tional PWM converters are capable of deliver- ing. At these loads, the switching frequency is determined by a minimum off-time (t OFF, MIN) and a maximum on-time (tON, MAX) where: tOFF ≥ KOFF / (VOUT - VBATT) and tON ≤ KON / VBATT with KOFF = 1.0Vμs and KON = 4.0Vμs. FUNCTIONAL DIAGRAM VBATT SHDN VBATT VO UVLO 0.61V 0.61V SDI IBIAS VO SDI INTERNAL VBATT FB LBI RLIM Ipkset current control current reference REF FB VO VOLOW SQ n CHARGE QR TOFF charge end IUC QKILL LX undercurrent comparator INTERNAL SUPPLY VO VBATT Max Ton VOUT QKILL PMOS NMOS LX current reference overcurrent comparator SWITCH GROUND PGND GND LBON INTERNAL GROUND LOAD Ref Block Min TOFF switch buffer c c n 0.61V SP6648 c c c 1.25V c

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation 4.900 4.920 4.940 4.960 4.980 5.000 5.020 5.040 5.060 5.080 5.100 0 100 200 300 400 500 Iload (mA) Vout (V) Vi=4.2V Vi=3.2V Vi=2.6V Vi=2.0V Vi=1.6V Vi=1.0V 100 Iload (mA) Efficiency (%) Vi=4.2V Vi=3.2V Vi=2.6V Vi=2.0V Vi=1.6V Vi=1.0V Efficiency vs. Current Load, VOUT=5.0V 100 150 200 250 300 Vin (V) Iin (uA) No Load Battery Current, VOUT=3.3V 100 Iload (mA) Efficiency (%) Vi=3.0V Vi=2.6V Vi=2.0V Vi=1.3V Vi=1.0V Efficiency vs. Load Current, VOUT=3.3V TYPICAL PERFORMANCE CHARACTERISTICS Refer to the Typical Application Circuit on page 1, T AMB=+25°C. 3.200 3.220 3.240 3.260 3.280 3.300 3.320 3.340 3.360 3.380 3.400 0 100 200 300 400 500 ILOAD(mA) VOUT (V) Vi=3.0V Vi=2.6V Vi=2.0V Vi=1.3V Vi=1.0V Line/Load Rejection vs. Load Current, VOUT = 3.3V 100 Vin (V) Iin (uA) Line/Load Rejection vs. Load Current, VOUT = 5.0V No Load Battery Current, VOUT=5.0V

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS Refer to the Typical Application Circuit on page 1, T AMB=+25°C. 100 150 200 250 300 350 400 450 500 Vin (V) Io (mA) Maximum Resistive Load Current in Startup, VOUT=5.0V 100 150 200 250 300 350 400 Vin (V) Io (mA) VOUT (AC) Inductor Current (0.2A/DIV) Output Ripple, VIN=2.6V, ILOAD=200mA, VOUT=3.3V VOUT (AC) Inductor Current (0.2A/DIV) Output Ripple, VIN=2.6V, ILOAD=200mA, VOUT=5.0V 0.0 1.0 2.0 3.0 4.0 5.0 Vin (V) Kon (V*usec) 0.0 1.0 2.0 3.0 4.0 5.0 Vin (V) Kon (V*usec) KON vs. VIN , VOUT=3.3V K ON vs. VIN , VOUT=5.0V Maximum Resistive Load Current in Startup, VOUT=3.3V

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation VOUT (AC) LX IOUT (0.5A/DIV) VOUT(AC) LX IOUT(0.2A/div) VIN VOUT IIN(1A/div) TYPICAL PERFORMANCE CHARACTERISTICS Refer to the Typical Application Circuit on page 1, T AMB=+25°C. 0.0 0.5 1.0 1.5 2.0 Vin (V) Koff (V*usec) 2.1 0.0 0.5 1.0 1.5 2.0 Vin (V) Koff (V*usec) Startup, VIN=2.6V, VOUT=3.3V, RLOAD = 100Ω Startup, VIN=4.2V, VOUT=5.0V, RLOAD = 100Ω KOFF vs. VIN , VOUT=3.3V KOFF vs. VIN , VOUT=5.0V VIN VOUT IIN (1A/div)

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation Circuit Layout Printed circuit board layout is a critical part of a power supply design. Poor designs can result in excessive EMI on the feedback paths and on the ground planes with applications involving high switching frequencies and large peak currents. Excessive EMI can result in instability or regu- lation errors. All power components should be placed on the PC board as closely as possible with the traces kept short, direct, and wide (>50mils or 1.25mm). Extra copper on the PC board should be integrated into ground as a pseudo-ground plane. On a multilayer PC board, route the star ground using component-side cop- per fill, then connect it to the internal ground plane using vias. For the SP6648 devices, the inductor and input- and output-filter capacitors should be soldered with their ground pins as close together as possible in a star-ground con- figuration. The V OUT pin must be bypassed di- rectly to ground as close to the SP6648 devices as possible (within 0.2in or 5mm). The DC-DC converter and any digital circuitry should be placed on the opposite corner of the PC board as far away from sensitive RF and analog input stages. Noisy traces, such as from the LX pin, should be kept away from the voltage-feedback V OUT node and separated from it using grounded copper to minimize EMI. See the SP6648EB Evaluation Board Manual for PC Board Layout design details. Component Selection Selection of capacitors for SP6648 power sup- ply circuits can be made through the use of the Component Selection Table. Capacitor equiva- lent series resistance (ESR) in the range of 0.2Ω to 0.3Ω is a requirement for obtaining sufficient output voltage ripple for the SP6648 to properly regulate under load. For ESR values in this range, low ESR tantalum capacitors are recom- mended. For example, in the SP6648 applica- tion circuit a 47 μF, 10V, low-ESR, surface- mount tantalum output filter capacitor typically provides 50mV output ripple when stepping up from 2.6V to 3.3V at 200mA. Ceramic capaci- tors have ESR too low to produce enough output ripple for the SP6648 to regulate the output. Designers should select input and output ca- pacitors with a rating exceeding the inductor current ripple, which is typically set by the inductor value and the K ON value as given in the following relationship: IL(RIPPLE) = KON/L For the example of the 10μH inductor the induc- tor current ripple would be 330mA, while for the 22μH inductor the inductor current ripple value would be 150mA. Do not allow tantalum ca- pacitors to exceed their ripple-current ratings. An input filter capacitor can reduce peak cur- rents drawn from the battery and improve effi- ciency. For most applications, use the same 47μF tantalum capacitor as used for the input. Low-ESR aluminum electrolytic capacitors are acceptable, provided they meet the ESR re- quirement of 0.2 Ω to 0.3 Ω, and we list an appropriate 100μF aluminum electrolytic in the component selection table, but standard alumi- num electrolytic capacitors are not recom- mended. In selecting an inductor, the saturation current specified for the inductor needs to be greater than the SP6648 peak current to avoid saturating the inductor, which would result in a loss in efficiency and could damage the inductor. The SP6648 evaluation board uses a Sumida CDRH5D28 10μH inductor with an I SAT value of 1.3A and a DCR of 0.065 Ω, which easily handles the I PEAK of 0.85A of the SP6648 and will deliver high efficiencies. Other inductors could be selected provided their I SAT is greater than the IPEAK of the SP6648. APPLICATIONS INFORMATION

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation APPLICATIONS INFORMATION: Continued Component Selection Table SP6648EB Evaluation Board Schematic 47µF L1 10µH 1µF 205K LBON 124K 47pF RLIM 1.87K VBATT 249K U1 SP6648 VBATT LBI2 RLIM SHDN5 FB 6 GND 7 PGND 8LBON3 LX 9 VOUT + C2 47µF 549K R5 1.0M 3.3VOUT INDUCTORS - SURFACE MOUNT Inductor Specification Inductance Manufacturer/Part No. Series R I SAT Size LxWxH Intuctor Type Manufacturer (μH) Ω (A) (mm) Website CAPACITORS - SURFACE MOUNT & LEADED Capacitor Specification Capacitance Manufacturer Part No. ESR Ripple Current Size LxWxH Voltage Capacitor Manufacturer (μF) Ω(max) (A) @ 85 °C (mm) (V) Type Website Note: Components highlighted in bold are those used on the SP6648EB Evaluation Board.

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation VOUT Programming The SP6648 can be programmed as either a voltage source or a current source. To program the SP6648 as a voltage source, the SP6648 requires 2 feedback resistors R1 & R2, as shown in the SP6648EB evaluation board schematic, to control the output voltage. To set V OUT in the voltage mode, use the equation: Using the RLIM Function The peak inductor current, IPEAK, is programmed externally by the R LIM resistor connected be- tween the RLIM pin and GND. The peak inductor current is defined by: IPEAK = 1600/RLIM The saturation current specified for the inductor needs to be greater than the peak current to avoid saturating the inductor, which would result in a loss in efficiency and could damage the induc- tor. The SP6648 evaluation board uses a R LIM value of 1.87K for an I PEAK = 850mA to allow the circuit to deliver up to 180mA for 1.3V input and 400mA for 2.6V input. Other values could be selected using the above relationships. Using the LBON - Low Battery Output Function The SP6648 will regulate the output until the input battery is completely discharged or until the under voltage lock-out (UVLO) occurs at VBATT = 0.61V. To provide a low battery warn- ing, the Low Battery Output function of the SP6648 can be used. LBON is programmed externally by the R 3 and R 4 resistor divider connected between V BATT , the LBI input pin and GND. The LBON is an open drain output, which is active low and is pulled up by a 1M Ω resistor R 5 to VOUT. When the LBI comparator falling threshold of 0.61V is reached, the LBON output goes low as determined by the relation- ship: V LOWBATT = 0.61 * [(R3 + R4)/R4] The SP6648 evaluation board R3 & R4 resistors have been set to trip for a falling battery thresh- old of about 2.0V. Using this relationship, other low battery threshold values can be set by the user. UVLO the Under Voltage Lock-Out Function Once started up, the SP6648 will regulate the output until the input battery is completely dis- charged or until the under voltage lock-out (UVLO) occurs at V BATT = 0.61V. The UVLO function will completely open all switches until the battery again rises above the 0.61V thresh- old. Maximum Startup Current It should be noted that for low input voltages the SP6648 startup circuit cannot support large load currents at startup. In startup the SP6648 needs to boost the output from zero volts using the input voltage. Once the output is greater than 1.9V, the operating circuit takes over and the SP6648 can supply much more current. Curves of maximum load current in startup for the SP6648 are shown in the typical performance characteristics and can be compared with the page one curve for maximum load current in operation. For 1-cell battery applications, it is recommended to apply any large load current after the SP6648 has started up, typically in a few milliseconds. This is typically not a problem in many applica- tions where the load is a processor whose load current is low until the processor voltage comes up. APPLICATIONS INFORMATION : Continued

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation APPLICATIONS INFORMATION SP6648LEDEB Evaluation Board with LumiLED High Brightness White LED For the high brightness LumiLED white LED application, the SP6648 is generally programmed as a current source. The bias resistor Rb is used to set the operating current of the white LED in the equation: R b = VREF/IF where VREF is around 0.61V, IF is the operating current of the LumiLED. To set the operating current to be about 350mA, Rb is selected as 1.8 Ω as shown in the following schematic. The effi- ciency of the SP6648 LumiLED circuit is im- proved by the use of a silicon diode D1 and resistor R1 to set the voltage at the current sense resistor R2 to 0.61V instead of the higher 1.25V at the FB pin. An efficiency curve follows showing the SP6648 efficiency driving 350mA output current into the high brightness LumiLED. As shown in following scope photos, if the SP6648 is powered up before the LumiLED is plugged in, the circuit will bring the Feedback pin to 0.0V and the SP6648 has a feature to set the output voltage to be 3.3V. Once the LumiLED is plugged in, the Feedback pin will go up to 1.25V and begin to regulate. The output voltage will go from 3.3V to 3.68V (=V F+0.61V), where VF is the forward voltage of the LumiLED. When the LumiLED is open, the Feedback pin voltage will go to 0.0V and the output voltage will go to 3.3V which will protect the part. SP6648LEDEB Evaluation Board Schematic SP6648LEDEB Efficiency Curve 100 Battery Voltage (V) Efficiency (%) SP6648 VBATT LBI2 RLIM SHDN5 FB 6 GND 7 PGND 8LBON3 LX 9 VOUT 16.2k 1W LED D1 1N4148 Rb 1.8Ω 10µF 10µF 1.8-3.2V (R5 optional) 10K VREF = 0.61V Important: 1µF Ceramic Cap at VOUT Pin needed for stable regulation 350mA IOUT=0.61V/Rb 1µF L1 10µHVBATT RLIM 1.87K

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation Brightness Control One approach to control LED brightness is to apply a PWM signal to the SHDN input of the SP6648. In this case, the output current will be equal to the product of 350mA and the average duty cycle at the SHDN pin. An optional 10KΩ potentiometer (R 5) may also be used for dim- ming the LED current by varying the potentiom- eter between low brightness and full brightness. APPLICATIONS INFORMATION VOUT VREF VOUT VREF Plug in the LumiLED Unplug the LumiLED PINOUTS SP6648

10 Pin MSOP

P GNDV GND FB

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation PACKAGE: 10 PIN MSOP Pin #1 designator to be within this INDEX AREA (D/2 * E1/2) FRONT VIEW L Gauge Plane Seating Plane cø R e E/2 E D 1 2 TOP VIEW (L1) 1 2 3 4 5 10 9 8 7 6 D/2 MIN NOM MAX MIN NOM MAX A1 0.00 - 0.15 0.000 - 0.006 c 0.08 - 0.23 0.004 - 0.009 ø 0º - 8º 0º - 8º ø1 5º - 15º 5º - 15º A - - 1.10 - 0.043 b 0.17 - 0.33 0.007 - 0.013 D E e SYMBOL

0.118 BSC

0.193 BSC

0.079 BSC

0.037 REF

0.010 BSC

0.020 BSC

SIPEX Pkg Signoff Date/Rev: JL Aug09-05 RevA

0.50 BSC

2.00 BSC

0.95 REF

0.25 BSC

3.00 BSC

4.90 BSC

10 Pin MSOP JEDEC MO-187 Variation BA

Dimensions in Millimeters: Controlling Dimension Dimensions in Inches Conversion Factor: 1 Inch = 25.40 mm SIDE VIEW A A2 Seating Plane b

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation PACKAGE: 10 PIN DFN MIN NOM MAX MIN NOM MAX ø 0º - 14º 0º - 14º D D2 2.20 - 2.70 0.087 - 0.106 E E2 1.40 - 1.75 0.056 - 0.069 e 3x3 10 Pin DFN JEDEC MO-229 VARIATION VEED-5 Dimensions in Millimeters: Controlling Dimension Dimensions in Inches Conversion Factor: 1 Inch = 25.40 mm 3.00 BSC 0.119 BSC SYMBOL SIPEX Pkg Signoff Date/Rev: JL Aug09-05 / RevA 0.20 REF 0.008 REF 0.119 BSC3.00 BSC 0.020 BSC0.50 BSC ø (A3) A Seating Plane SIDE VIEW 12345 9876 INDEX AREA (D/2 x E/2) BOTTOM VIEW be L K E2/2 D2/2 Pin1 Designator to be within this INDEX AREA (D/2 x E/2) TOP VIEW D E E/2 D/2

Date: 6/7/06 Rev B SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation Part Number Top Mark Operating Temperature Range Package Type

ORDERING INFORMATION

/TR = Tape and Reel Pack quantity is 2,500 for MSOP and 3,000 for DFN. Available in lead free packaging. To order add "-L" suffix to part number. Example: SP6648EU/TR = standard; SP6648EU-L/TR = lead free Sipex Corporation Headquarters and Sales Office

233 South Hillview Drive

Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others.

Datasheet Appendix & Web Link Information © 2007 Sipex Corporation For further assistance: Email: Sipexsupport@sipex.com WWW Support page: http://www.sipex.com/content.aspx?p=support Sipex Application Notes: http://www.sipex.com/applicationNotes.aspx Product Change Notices: http://www.sipex.com/content.aspx?p=pcn Sipex Corporation Headquarters and Sales Office Milpitas, CA95035 tel: (408) 934-7500 faX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. The following sections contain information which is more changeable in nature and is therefore generated as appendices. 1) Package Outline Drawings 2) Ordering Information If Available: 3) Frequently Asked Questions 4) Evaluation Board Manuals 5) Reliability Reports 6) Product Characterization Reports 7) Application Notes for this product 8) Design Solutions for this product Solved by TM Solved by TM Appendix and Web Link Information

™™™ ™ PartnerNet™ Advanced™Search™ Part Number Search Keyword Search Home Products Support Contact Us About Us News Investors Careers Product Lines Power Management Boost™Regulators ™™ Buck™Regulators ™™ Charge™Pumps ™™ LED™Drivers ™™ Linear™Regulators ™™ Power™Blox™™™ PWM™Controllers ™™ References ™™ Supervisors ™™ USB™Vbus™Switches ™ Interface Multiprotocol™™ RS232 ™™ RS422 ™™ RS485 ™™ USB ™ Optical Storage Advanced™Power™ Control Photo™Detector™IC ™ SP6648 product details You™are™here™:™Home ™:™Products ™:™Boost™Regulators Features ™ UltraYlow™12µA™Quiescent™Current™™ 400mA™Output™Current™at™2.6V™Input:™3.3VOUT™™ Wide™Input™Voltage™Range:™0.95V™to™4.5V™™ 3.3V™Fixed™or™Adjustable™Output™™ Integrated™Synchronous™Rectifier:™0.3 Ω™™ 0.3 Ω™Switch™™ AntiYRinging™Switch™Technology™™ Programmable™Inductor™Peak™Current™™ Logic™Shutdown™Control™™ Under™Voltage™LockYOut™at™0.61V™™ Programmable™Low™Battery™Detect™™ Single™or™Dual™Cell™Alkaline™™ Small™10™pin™DFN™Package™and™Industry™Standard™10™ pin™MSOP™ Fixed™3.3V Ultra- low Quiescent Current, High Efficiency Boost Regulator Quick Links ™ Download™ Datasheet Check™Price™and™ Availability ™ Design-In Support Email:™Tech™Support Boost™Regulators™ Product™Selector Applications™Notes Evaluation™Boards Quality™Information Part™Nomenclature Ordering Part Number ™ Part Number Package Code RoHS MIN. Temp. (°C) MAX. Temp. (°C) Status Buy Samples SP 6648 ERYL DFN10 ▪ Y40 85 Active Buy Now Order Samples SP 6648 ERY L/TR DFN10 ▪ Y40 85 Active Buy Now Order Samples SP 6648 EUYL MSOP10 ▪ Y40 85 Active Buy Now Order Samples SP 6648 EUY L/TR MSOP10 ▪ Y40 85 Active Buy Now Order Samples BOOST™ REGULATOR™ SP 6648 ™ ™ ™ ™ SP 6648 EB Board 0 70 Active Buy Now Order Samples SP 6648 LEDEB Board 0 70 Active Buy Now Order Samples SP 6648 UEB Board 0 70 Active Buy Now Order Samples SP 6648 ER DFN10 Y40 85 EOL Buy Now SP 6648 ER/TR DFN10 Y40 85 EOL Buy Now SP 6648 EU MSOP10 Y40 85 EOL Buy Now SP 6648 EU/TR MSOP10 Y40 85 EOL Buy Now Part Status Legend Active ™Y™the™part™is™released™for™sale,™standard™product.™ EOL (End of Life) ™Y™the™part™is™no™longer™being™manufactured,™there™may™or™may™not™be™inventory™still™in™stock.™ Page 1 of 2Sipex Corporation - Sipex Product Details 7/6/2007http://www.sipex.com/productDetails.aspx?part=SP6648&keyword=6648

CF (Contact Factory) ™Y™the™part™is™still™active™but™customers™should™check™with™the™factory™for™availability.™Longer™leadYtimes™may™apply.™ PRE (Pre-introduction) ™Y™the™part™has™not™been™introduced™or™the™part™number™is™an™early™version™available™for™sample™only.™ OBS (Obsolete) ™Y™the™part™is™no™longer™being™manufactured™and™may™not™be™ordered.™ NRND (Not Recommended for New Designs) ™Y™the™part™is™not™recommended™for™new™designs.™ All™rights™reserved,™Sipex™2007 ™ Page 2 of 2Sipex Corporation - Sipex Product Details 7/6/2007http://www.sipex.com/productDetails.aspx?part=SP6648&keyword=6648

Nov28-06 RevC ANP8: SP6648 Flashlight Solution © 2006 Sipex Corporation Page 1 of 2 1.8V → 3.2V Input range Regulated 350mA output current Highly integrated design, minimal components On chip synchronous power switches Small 3x3mm 10 Pin DFN package High efficiency: Greater than 90% Constant brightness over full battery range Uses 2 cell Alkaline, NiCAD or NiMH battery Also works for Lithium camera battery Efficiency over full battery voltage range. Introduction The SP6648 integrated synchronous boost regulator is a compact circuit that provides a ultra- high efficiency drive current for an LED flashlight using a LuxeonTM I light source. The circuit shown below is configured to provide 350mA constant output current for a two cell alkaline battery application. All components are compact surface mount devices, yielding a tiny final solution. Diode D1 has been added to reduce the effective feedback voltage from 1.25V down to 0.61V to improve efficiency. The LED current can be programmed as high as 900mA depending on the set resistor value. Operating quiescent current of the part is only 12uA, so only a negligible amount of power is used by the part itself. The SP6648 is available in MSOP for easy pin access in proto- type and testing, and also 3x3mm DFN for the smallest production circuit. Application Schematic Solved by TM APPLICATION NOTE ANP8 SP6648 Flashlight Application

Nov28-06 RevC ANP8: SP6648 Flashlight Solution © 2006 Sipex Corporation Page 2 of 2 For further assistance: Email: Sipexsupport@sipex.com WWW Support page: http://www.sipex.com/content.aspx?p=support Live Technical Chat: http://www.geolink-group.com/sipex/ Sipex Application Notes: http://www.sipex.com/applicationNotes.aspx Sipex Corporation Headquarters and Sales Office Milpitas, CA95035 tel: (408) 934-7500 faX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Solved by TM

The SP6648 Evaluation Board is designed to help the user evaluate the performance of the SP6648 for use as a single or dual cell input to +3.3V output DC-DC Converter. The output of the SP6648 is preset to +3.3V or can be adjusted from +2V to +5.5V by manipulating two external resistors. The evaluation board is a completely assembled and tested surface mount board which provides easy probe access points to all SP6648 Inputs and Outputs so that the user can quickly connect and measure electrical characteristics and waveforms. SP6648 EVALUATION BOARD SCHEMATIC RLIM 1.87K LBON VBATT + C2 47uF 3.3Vout L1 10uH 47pF SP6648 5 6 10VBATT LBI RLIM SHDN FB GND PGNDLBON LX VOUT 124K LBI SHDN 205K 1uF 47uF /square4 Easy Evaluation for the SP6648 Single or Dual Cell Alkaline to 2V to 5V Output /square4 Provides 300mA output at 3.3V output for 2.0V Input /square4 High Efficiency: 94% /square4 µSOIC Package & SMT components for small, low profile Power Supply SP6648 Evaluation Board Manual

USING THE EVALUATION BOARD 1) Powering Up the SP6648 Circuit The SP6648 Evaluation Board can be powered from inputs from a +0.95V to +3.3V from 1 or 2 alkaline cells. Connect with short leads directly to the “Vbatt” and “Gnd” posts. Monitor the Output Voltage and connect the Load between the “Vout” post and the 2nd “GND” post. 2) Using the J1 Jumper: Enabling the SP6648 Output and using the Shutdown Mode The SP6648 output will be Enabled if the J1 Jumper is in the top or pin 1 to 2 position. If J1 is in the pin 2 to 3 position, the Shutdown pin is brought to GND, which puts the SP6648 in the low quiescent Shutdown Mode. 3) Using the Rlim Function The peak inductor current, IPEAK, is programmed externally by the RLIM resistor connected between the RLIM pin and GND. The peak inductor current is defined by: IPEAK = 1400/RLIM The SP6648 datasheet specifications for RLIM give a range of 1750 to 4000 ohms. Using the IPEAK equation above gives an IPEAK range of IPEAK range = 350 to 800mA. The saturation current specified for the inductor needs to be greater then the peak current to avoid saturating the inductor, which would result in a loss in efficiency and could damage the inductor. The SP6648 evaluation board uses a Rlim value of 1.87K for an Ipeak = 750mA to allow the circuit to deliver up to 180mA for 1.3V input and 400mA for 2.6V input. Other values could be selected using the above relationships. 4) Using the LBON - Low Battery Output Function The Low Battery Output function, LBON, is programmed externally by the R3 and R4 resistor divider connected between Vbatt, the LBI input pin and GND. The LBON is an open drain output, which is active low and is pulled up by a 1M resistor R5 to Vout. When the LBI comparator falling threshold of 0.625V is reached, the LBON output goes low as determined by the relationship: LBON falling = Vbatt*R4/(R3 +R4) The SP6648 evaluation board R3 & R4 resistors have been set to trip for a falling battery threshold of about 2.0V. Using this relationship, other low battery threshold values can be set by the user.

TABLE1: SP6648EB LIST OF MATERIALS Model Temperature Range Package Type Ref. Des. Qty. Manufacturer Part Number Layout Component Vendor Size 1S ipex Corp. 146-6479-00 1"x1.5" SP6648UEB Eval PC Board Sipex 978-667-7800 U1 1 Sipex Corp. SP6648EU uSO-8 10-pin uSOIC Step-Up DC/DC Conv Sipex C1,2 2 Kemet T494C476K010AS "D" size 47uF 10V SM 0.3ohm ESR Kemet 847-517-1030 C1,2 2 Kemet T494V476K010AS "V" size 47uF 10V low profile SM 0.3ohm ESR Kemet 847-517-1030 C3 1 TDK Corp C1608SL1H470K 0603 Ceramic 16V 47pF SM TDK 847-803-6100 C4 1 TDK Corp C1608X5R1A105M 0603 Ceramic 10V 1uF SM 0.02ohm ESR TDK 847-803-6100 R1 1 Panasonic ERJ-3EKF2053 0603 205K ohm 1/8W 1% 0603 SM Digi-Key 800-344-4539 R2 1 Panasonic ERJ-3EKF2493 0603 124K ohm 1/8W 1% 0603 SM 800-Digi-Key R3 1 Panasonic ERJ-3EKF5493 0603 549K ohm 1/8W 1% 0603 SM 800-Digi-Key R4 1 Panasonic ERJ-3EKF2493 0603 249K ohm 1/8W 1% 0603 SM 800-Digi-Key R5 1 Panasonic ERJ-3GEYJ105 0603 1M ohm 1/8W 5% 0603 SM 800-Digi-Key RLIM 1 Panasonic ERJ-3EKF1871 0603 1.87K ohm 1/8W 1% 0603 SM 800-Digi-Key TP 5 Mill-Max 0300-115-01-4727100 .042 Dia Test Point Female Pin 800-Digi-Key J1 1 Sullins PTC36SAAN .23x.12 3-Pin Header 800-Digi-Key 1 Sullins STC02SYAN .2x.1 Shunt 800-Digi-Key

DESCRIPTION AND BOARD SCHEMATIC The SP6648LED Evaluation Board is designed to help the user evaluate the performance of the SP6648 for use as a dual cell input to drive a 1W LumiLED. The evaluation board is a completely assembled and tested surface mount board which provides easy probe access points to all SP6648 inputs and outputs so that the user can quickly connect and measure electrical characteristics and waveforms. /square4 Easy evaluation for SP6648 performance of driving 1W LumiLED. /square4 Plug & Light ON /square4 Self Protection /square4 Programmable Inductor Peak Current /square4 High Efficiency: up to 94% /square4 µSOIC Package & SMT components for small, low profile Power Supply SP6648LED Evaluation Board Manual 16K

USING THE EVALUATION BOARD 1) Powering Up the SP6648LED Circuit The SP6648LED Evaluation Board can be powered from inputs from a +1.8V to +3.2V power supply or from 2 alkaline cells. Connect with short leads directly to the “VIN” and “GND” posts. Plug the 1W LumiLED between the “VOUT” and “REF” posts. Unlike other boost regulators, the part has self-protection feature. It will not be damaged when the output is open as long as there is a low resistance from FB to GND. As shown in Figures 1 and 2, if the board is powered up before the LumiLED is plugged in, the circuit will bring the Feedback pin to 0V and the SP6648 has a feature to set the output voltage to be 3.3V. Once the LumiLED is plugged in, the Feedback pin will go up to 1.25V and begin to regulate. The output voltage will go from 3.3V to 3.68V (=V F+0.61V) accordingly (as shown in Fig. 1), where V F is the forward voltage of the LumiLED. When the LumiLED is open, the Feedback pin voltage will go to 0V and the output voltage will go to 3.3V which will protect the part (as shown in Fig 2). Fig 1. Plug in the LumiLED Fig. 2. Unplug the LumiLED 2) Using the J1 Jumper: Enabling the SP6648 Output and using the Shutdown Mode The SP6648 output will be enabled if the J1 Jumper is in the top or pin 1 to 2 position. If J1 is in the pin 2 to 3 position, the Shutdown pin is brought to GND, which puts the SP6648 in the low quiescent Shutdown Mode. 3) Selecting the Bias Resistor In the white LEDs application, the SP6648 is generally programmed as a current source. The bias resistor is used to set the operating current of the white LED as equation F REF b I VR = where V REF is around 0.61V, I F is the operating current of the Lumiled. To set the operating current to be about 350mA, Rb is selected as 1.8 Ohm as shown in the schematic. 4) Vout Programming The SP6648 can be programmed as either a voltage source or a current source. To program the SP6648 as voltage source, the SP6648 requires 2 feedback resistors R 6 & R7 to control the output voltage. To set Vout in the voltage mode, use the equation: out 6 R161.0 VR •  −= VOUT VOUT VREF VREF

5) Using the Rlim Function The peak inductor current, IPEAK, is programmed externally by the RLIM resistor connected between the RLIM pin and GND. The peak inductor current is defined by: IPEAK = 1400/RLIM The SP6648 datasheet specifications for RLIM give a range of 1.87K to 4K ohms. Using the I PEAK equation above gives an IPEAK range of 350 to 750mA. The saturation current specified for the inductor needs to be greater then the peak current to avoid saturating the inductor, which would result in a loss in efficiency and could damage the inductor. The SP6648 evaluation board uses a R lim value of 1.87K for an I peak = 750mA to allow the circuit to deliver up to 180mA for 1.3V input and 400mA for 2.6V input. Other values could be selected using the above relationships. 6) Using the LBON - Low Battery Output Function The SP6648 will regulate the output current until the input battery is completely discharged. To provide an early low battery warning, the Low Battery Output function of the SP6648 switching regulator can be used. LBON is programmed externally by the R1 and R 2 resistor divider connected between VIN, the LBI input pin and GND. When the LBI comparator falling threshold of 0.61V is reached, D1 switches on, indicating low battery condition. Low battery detect trip point can be calculated by the following formula: LOWBAT R RR61.0V +⋅= The SP6648 evaluation board R 1 & R2 resistors have been set to trip for a falling battery threshold of about 2.0V. Using this relationship, other low battery threshold values can be set by the user. 7) Brightness Control One approach to control LED brightness is to apply a PWM signal to the SHDN input of the SP6648. In this case, the output current will be equal to the product of 350mA and the average duty cycle at the SHDN pin. An additional 10K potentiometer (R 5) may also be used for dimming LED. LED current is varied by the potentiometer between almost zero and full 350mA. POWER SUPPLY DATA For the standard evaluation board, The efficiency curve is shown in the figure below. 100 Battery Voltage (V) Efficiency (%) Fig.3 Efficiency curve of the SP6648LED evaluation board

TABLE1: SP6648LEDEB LIST OF MATERIALS SP6648LED Evaluation Board List of Materials Ref. Des. Qty. Manufacturer Part Number Layout Size Component Vendor LxWxH 1S ipex Corp. 146-6510-00 1"x2.14" SP6648LED Eval PC Board Future 888-589-3662 U1 1S ipex Corp. SP6648EU MSOP-10 10 PIN High Efficiency Boost Regulat o Future 888-589-3662 C1,C3 2 TDK Corp TDKC3216X5R0J106K 1206 10uF/6.3V/X5R/10% Ceramic Future 888-589-3662 C2 1 TDK Corp TDKC1608X5R0J105K 603 1uF/6.3V/X5R/10% Ceramic Future 888-589-3662 L1 1 Sumida CD43-100 4x4.5x3.2mm 10uH, 1.04A, 0.18 Ohm, SM inductor Future 888-589-3662 R1 1 Rohm MCR03EZPFX1003 603 100K 1/16W 1% 0603 SM Future 888-589-3662 R2 1 Rohm MCR03EZPFX4322 603 43.2K 1/16W 1% 0603 SM Future 888-589-3662 R3 1 Rohm MCR03EZPFX1501 603 Open Future 888-589-3662 R4 1 Rohm MCR03EZPFX1622 603 16.2K 1/16W 1% 0603 SM Future 888-589-3662 R5 1 Rohm MVR32HXBRN103 3x3.6x1.3mm 0 Ohm between pin 1 and pin 3 Future 888-589-3662 R6 1 Rohm Open Future 888-589-3662 R7 1 Rohm Open Future 888-589-3662 Rlim 1 Rohm MCR03EZPFX1871 603 1.87K 1/16W 1% 0603 SM Future 888-589-3662 Rb 1 Rohm MCR25JZHJ1R8 1210 1.8 Ohm 1/4W 5% 1210 SM Future 888-589-3662 D1 1S tanley BR1101W-TR 3x1.5x1.5mm Open Future 888-589-3662 D2 1D iode Inc. 1N4148W-7 SOD-123 75V 150mA SM Diode Future 888-589-3662 TP 7M ill-Max 0300-115-01-4701100 .042 Dia Test Point Female Pin Future 888-589-3662 J1 1 Sullins PTC36SAAN .23x.12 2-Pin Header Future 888-589-3662 Model Temperature Range Package Type

Portable Lighting SolutionsPortable Lighting Solutions Featuring Sipex SP6648: The High Efficiency Flashlight Solution Featuring Sipex SP6648: The High Efficiency Flashlight Solution SP6648 Boost Regulator The SP6648 is an ideal solution for today’s low power systems through its ability to power either alkaline or Li-Ion based battery applications. The SP6648 consumes ultra-low quiescent current of only 12µA, while delivering up to 800mA output current. This unique combination of high output power and low quiescent current is accomplished by automatically switching from pulse width modulation (PWM) to pulse frequency modulation (PFM) under light load conditions. The SP6648 combines its low energy requirements with enabling features such as programmable peak current, low battery detect and power shutdown control. The high efficiency, wide input voltage range, and small package size make these parts well-suited for use in LED- based flashlight power supply circuits. SP6648 Features

• Ultra-low quiescent current
• 800mA inductor current at 2.6V input: 3.3V OUT
• 94% efficiency from 2 cell to 3.3V OUT
• Wide input voltage range: 0.7V to 4.5V
• 3.3V fixed or adjustable output
• Integrated synchronous rectifier: 0.3Ω
• Anti-ringing switch technology
• Programmable inductor peak current
• Logic shutdown control
• Under-voltage lock-out at 0.61V
• Programmable low battery detect
• Single or dual cell alkaline
• Small package size: 10-pin DFN or 10-pin MSOP Typical Applications for the SP6648
• Flashlights
• Camera flash LED driver
• Wireless mouse
• Pagers
• Medical monitors
• Handheld portable devices Typical Application for the SP6648 1.87K1.87KΩ 10µF 10µF 3.3kΩ 1.8Ω 10µHVBATT =1.8V to 3.0V LED VOUTVBATT LBI LBON R LIM SHDN VOUT LX PGND GND FB SP6648 For a complete list of evaluation boards and application notes For a complete list of evaluation boards and application notes High Efficiency Synchronous Solution

Sipex SP6648: The High Efficiency Flashlight Solution Part Number Temperature Package SP6648EU -40C to +85C 10 Pin MSOP SP6648EU/TR -40C to +85C 10 Pin MSOP SP6648ER -40C to +85C 10 Pin DFN SP6648ER/TR -40C to +85C 10 Pin DFN Notes: 1. /TR = Tape and Reel 2. Available in lead free packaging. To order add "-L" suffix. Example: SP6648EU-L/TR PACKAGE: 10 PIN DFN D E E/2 D/2 DIMENSIONS in (mm) (JEDEC MO-229, VEED-5 VARIATION) A b D E e L K 0.80 0.90 1.00

0.20 REF

2.20 - 2.70 1.40 - 1.75 0.30 0.40 0.50 0.20 0.18 0.25 0.30 0.50PITCH SYMBOL MIN NOM MAX 0 0.02 0.05 - - Top View Bottom View A be L K 1 2 Side View (ALL DIMENSIONS IN MILLIMETERS)