LTC3200/LTC3200-5 Low Noise, Regulated Charge Pump DC/DC Converters U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LTC®3200/LTC3200-5 are low noise, constant frequency switched capacitor voltage doublers. They produce a regulated output voltage from a 2.7V to 4.5V input with up to 100mA of output current. Low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make the LTC3200/LTC3200-5 ideally suited for small, battery-powered applications. Low Noise Constant Frequency Operation Output Current: 100mA Available in 8-Pin MSOP (LTC3200) and Low Profile (1mm) 6-Pin ThinSOTTM (LTC3200-5) Packages 2MHz Switching Frequency Fixed 5V ± 4% Output (LTC3200-5) or ADJ VIN Range: 2.7V to 4.5V Automatic Soft-Start Reduces Inrush Current No Inductors ICC <1µA in Shutdown A new charge-pump architecture maintains constant switching frequency to zero load and reduces both output and input ripple. The LTC3200/LTC3200-5 have thermal shutdown capability and can survive a continuous shortcircuit from VOUT to GND. Built-in soft-start circuitry prevents excessive inrush current during start-up. U APPLICATIO S ■ ■ ■ ■ ■ White LED Backlighting Li-Ion Battery Backup Supplies Local 3V to 5V Conversion Smart Card Readers PCMCIA Local 5V Supplies High switching frequency enables the use of small ceramic capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to <1µA. The LTC3200 is available in an 8-pin MSOP package and the LTC3200-5 is available in a 6-pin ThinSOT. , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. U TYPICAL APPLICATIO Output Ripple Voltage vs Load Current Regulated 5V Output from a 2.7V to 4.5V Input 40 VIN = 3V CFLY = 1µF TA = 25°C 4 VIN 2.7V TO 4.5V 1µF 5 2 3 OFF ON 6 C+ C– LTC3200-5 VIN VOUT 1 1µF GND VOUT = 5V ±4% IOUT UP TO 40mA, VIN ≥ 2.7V IOUT UP TO 100mA, VIN ≥ 3.1V OUTPUT RIPPLE (mVP-P) 1µF 30 COUT = 1µF 20 COUT = 2.2µF 10 SHDN ALL CAPACITORS = MURATA GRM 39X5R105K6.3AJ OR TAIYO YUDEN JMK107BJ105MA 0 3200-5 TA01 0 50 75 25 OUTPUT CURRENT (mA) 100 3200 TA02 1 LTC3200/LTC3200-5 W W U W ABSOLUTE AXI U RATI GS (Note 1) VIN to GND ...................................................– 0.3V to 6V VOUT to GND .............................................– 0.3V to 5.5V VFB, SHDN to GND ........................ – 0.3V to (VIN + 0.3V) IOUT (Note 2) ....................................................... 150mA VOUT Short-Circuit Duration ............................. Indefinite Operating Temperature Range (Note 3) .. – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C U W U PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER TOP VIEW C+ VIN C– PGND 1 2 3 4 8 7 6 5 VOUT FB SHDN SGND MS8 PACKAGE 8-LEAD PLASTIC MSOP LTC3200EMS8 ORDER PART NUMBER TOP VIEW VOUT 1 6 C+ GND 2 5 VIN SHDN 3 4 C– LTC3200ES6-5 MS8 PART MARKING S6 PACKAGE 6-LEAD PLASTIC SOT-23 S6 PART MARKING LTNV TJMAX = 150°C, θJA = 230°C/W LTSH TJMAX = 150°C, θJA = 200°C/W Consult factory for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range. Specifications are at TA = 25°C, VIN = 3.6V, CFLY = 1µF, CIN = 1µF, COUT = 1µF unless otherwise noted. SYMBOL PARAMETER VIN Input Voltage VOUT Output Voltage ICC CONDITIONS MIN TYP MAX UNITS 4.5 V 5 5 5.2 5.2 V V 3.5 8 mA 1 µA ● 2.7 2.7V ≤ VIN ≤ 4.5V, IOUT ≤ 40mA 3.1V ≤ VIN ≤ 4.5V, IOUT ≤ 100mA ● ● 4.8 4.8 Operating Supply Current IOUT = 0mA, SHDN = VIN ● ISHDN Shutdown Current SHDN = 0V, VOUT = 0V ● VFB FB Voltage (LTC3200) IFB FB Input Current (LTC3200) VFB = 1.4V VR Output Ripple (LTC3200-5) VIN = 3V, IOUT = 100mA η Efficiency (LTC3200-5) VIN = 3V, IOUT = 50mA FOSC Switching Frequency VIH SHDN Input Threshold VIL SHDN Input Threshold IIH SHDN Input Current SHDN = VIN ● –1 IIL SHDN Input Current SHDN = 0V ● –1 tON VOUT Turn-On Time VIN = 3V, IOUT = 0mA, 10% to 90% 0.8 ms ROL Open-Loop Output Resistance VIN = 3V, IOUT = 100mA, VFB = 0V (Note 4) 9.2 Ω 1.217 ● –50 1.268 1.319 V 50 nA 30 1 ● mVP-P 80 % 2 MHz 1.3 V ● Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Based on long term current density limitations. 2 ● 0.4 V 1 µA 1 µA Note 3: The LTC3200E/LTC3200E-5 are guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 4: ROL ≡ (2 VIN – VOUT)/IOUT LTC3200/LTC3200-5 U W TYPICAL PERFOR A CE CHARACTERISTICS Output Voltage vs Supply Voltage OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) TA = 25°C 5.00 CIN = COUT = CFLY = 1µF VSHDN = VIN CIN = COUT = CFLY = 1µF TA = 25°C TA = 85°C 5.05 6 5.2 CIN = COUT = CFLY = 1µF IOUT = 20mA 5.10 No Load Supply Current vs Supply Voltage Output Voltage vs Load Current TA = – 40°C 4.95 SUPPLY CURRENT (mA) 5.15 (LTC3200-5) 5.1 5.0 VIN = 3.2V VIN = 2.7V VIN = 3V 4.9 TA = 25°C 5 TA = 85°C 4 TA = – 40°C 4.90 4.85 2.7 3.0 3.3 3.6 3.9 SUPPLY VOLTAGE (V) 4.2 4.8 4.5 3 100 150 50 LOAD CURRENT (mA) 0 200 3200 F01 2.7 100 1.0 90 CIN = COUT = CFLY = 1µF TA = 25°C 2.0 TA = 85°C 1.8 1.6 1.4 EFFICIENCY (%) THRESHOLD VOLTAGE (V) TA = – 40°C TA = 25°C 0.8 TA = 85°C 0.7 1.0 2.7 0.6 3.0 3.3 3.6 3.9 SUPPLY VOLTAGE (V) 4.2 4.5 VIN = 2.7V VIN = 3.2V 70 VIN = 3.7V 60 VIN = 4.5V 50 40 1.2 30 0.5 2.7 3.0 3.3 3.6 3.9 SUPPLY VOLTAGE (V) 4.2 3200 G04 4.5 3200 G05 1 10 LOAD CURRENT (mA) 100 3200 G06 Short Circuit Current vs Supply Voltage 250 OUTPUT CURRENT (mA) OSCILLATOR FREQUENCY (MHz) 2.2 80 TA = – 40°C 0.9 4.5 Efficiency vs Load Current 1.1 2.8 TA = 25°C 4.2 3200 G03 VSHDN Threshold Voltage vs Supply Voltage 3.0 2.4 3.3 3.6 3.9 SUPPLY VOLTAGE (V) 3200 G02 Oscillator Frequency vs Supply Voltage 2.6 3.0 CFLY = 1µF TA = 25°C VOUT = 0V 200 150 100 2.7 3.0 3.3 3.6 3.9 SUPPLY VOLTAGE (V) 4.2 4.5 3200 G07 3 LTC3200/LTC3200-5 U W TYPICAL PERFOR A CE CHARACTERISTICS VOUT Soft-Start Ramp (LTC3200-5) TA = 25°C Load Transient Response Output Ripple VSHDN 2V/DIV VOUT (AC COUPLED) 20mV/DIV COUT = 1µF VOUT 1V/DIV COUT = 3.3µF IL 10mA TO 90mA 50mA/DIV VOUT (AC COUPLED) 50mV/DIV COUT = 10µF VIN = 3V 200µs/DIV 32005 G08 U U U PIN FUNCTIONS VIN = 3.3V IL = 100mA 32005 G09 VIN = 3.3V COUT = 1µF 10µs/DIV 32005 G10 LTC3200/LTC3200-5 C + (Pins 1/6): Flying Capacitor Positive Terminal. VIN (Pins 2/5): Input Supply Voltage. VIN should be bypassed with a 1µF to 4.7µF low ESR ceramic capacitor. C – (Pins 3/4): Flying Capacitor Negative Terminal. GND (Pins 4,5/2): Ground. Should be tied to a ground plane for best performance. SHDN (Pins 6/3): Active Low Shutdown Input. A low on SHDN disables the LTC3200/LTC3200-5. SHDN must not be allowed to float. 4 200ns/DIV FB (Pin 7): (LTC3200 Only) Feedback Input Pin. An output divider should be connected from VOUT to FB to program the output voltage. VOUT (Pins 8/1): Regulated Output Voltage. VOUT should be bypassed with a 1µF to 4.7µF low ESR ceramic capacitor as close as possible to the pin for best performance. LTC3200/LTC3200-5 W W SI PLIFIED BLOCK DIAGRA S LTC3200 SOFT-START AND SWITCH CONTROL VOUT 8 FB 7 6 SHDN 1 C+ 3 C– 2MHz OSCILLATOR – + CHARGE PUMP VIN 2 5 4 SGND PGND 3200 BD LTC3200-5 SOFT-START AND SWITCH CONTROL VOUT 3 SHDN 6 C+ 4 C– 1 2MHz OSCILLATOR – + CHARGE PUMP VIN 5 2 3200-5 BD GND 5 LTC3200/LTC3200-5 U OPERATIO Operation (Refer to Simplified Block Diagrams) The LTC3200/LTC3200-5 use a switched capacitor charge pump to boost VIN to a regulated output voltage. Regulation is achieved by sensing the output voltage through an internal resistor divider (LTC3200-5) and modulating the charge pump output current based on the error signal. A 2-phase nonoverlapping clock activates the charge pump switches. The flying capacitor is charged from VIN on the first phase of the clock. On the second phase of the clock it is stacked in series with VIN and connected to VOUT. This sequence of charging and discharging the flying capacitor continues at a free running frequency of 2MHz (typ). In shutdown mode all circuitry is turned off and the LTC3200/LTC3200-5 draw only leakage current from the VIN supply. Furthermore, VOUT is disconnected from VIN. The SHDN pin is a CMOS input with a threshold voltage of approximately 0.8V. The LTC3200/LTC3200-5 is in shutdown when a logic low is applied to the SHDN pin. Since the SHDN pin is a high impedance CMOS input it should never be allowed to float. To ensure that its state is defined it must always be driven with a valid logic level. Short-Circuit/Thermal Protection The LTC3200/LTC3200-5 have built-in short-circuit current limiting as well as overtemperature protection. During short-circuit conditions, they will automatically limit their output current to approximately 225mA. At higher temperatures, or if the input voltage is high enough to cause excessive self heating on chip, thermal shutdown circuitry will shut down the charge pump once the junction temperature exceeds approximately 160°C. It will reenable the charge pump once the junction temperature drops back to approximately 155°C. The LTC3200/LTC3200-5 will cycle in and out of thermal shutdown indefinitely without latch-up or damage until the short-circuit on VOUT is removed. Shutdown Current Since the output voltage can go above the input voltage, special circuitry is required to control internal logic. Detection logic will draw an input current of 5µA when the LTC3200 is in shutdown. However, this current will be eliminated when the output voltage (VOUT) is at 0V. To ensure that VOUT is at 0V in shutdown on the adjustable LTC3200 a bleed resistor may be needed from VOUT to GND. Typically 10k to 100k is acceptable. Soft-Start The LTC3200/LTC3200-5 have built-in soft-start circuitry to prevent excessive current flow at VIN during start-up. The soft-start time is preprogrammed to approximately 1ms, so the start-up current will be primarily dependent upon the output capacitor. The start-up input current can be calculated with the expression: ISTARTUP = 2C OUT VOUT 1ms For example, with a 2.2µF output capacitor the start-up input current of an LTC3200-5 will be approximately 22mA. If the output capacitor is 10µF then the start-up input current will be about 100mA. Programming the LTC3200 Output Voltage (FB Pin) While the LTC3200-5 version has an internal resistive divider to program the output voltage, the programmable LTC3200 may be set to an arbitrary voltage via an external resistive divider. Since it employs a voltage doubling charge pump, it is not possible to achieve output voltages greater than twice the available input voltage. Figure 1 shows the required voltage divider connection. The voltage divider ratio is given by the expression: R1 V = OUT – 1 R2 1.268V Typical values for total voltage divider resistance can range from several kΩs up to 1MΩ. VOUT 8 R1 FB 7 ( ) VOUT 1.268V 1 + R1 R2 COUT R2 PGND SGND 4 5 32005 F01 Figure 1. Programming the Adjustable LTC3200 6 LTC3200/LTC3200-5 U OPERATIO Maximum Available Output Current For the adjustable LTC3200, the maximum available output current and voltage can be calculated from the effective open-loop output resistance, ROL, and effective output voltage, 2VIN(MIN). ROL + – + 2VIN IOUT VRIPPLEP − P ≅ 32005 F02 Figure 2. Equivalent Open-Loop Circuit From Figure 2 the available current is given by: 2VIN – VOUT ROL Typical ROL values as a function of temperature are shown in Figure 3. OUTPUT RESISTANCE (Ω) 11 The value of COUT directly controls the amount of output ripple for a given load current. Increasing the size of COUT will reduce the output ripple at the expense of higher minimum turn on time and higher start-up current. The peak-to-peak output ripple is approximately given by the expression: VOUT – IOUT = Tantalum and aluminum capacitors are not recommended because of their high ESR. IOUT = 100mA CFLY = 1µF VFB = 0V 10 VIN = 2.7V VIN = 3.3V 9 IOUT 2fOSC • C OUT Where fOSC is the LTC3200/LTC3200-5’s oscillator frequency (typically 2MHz) and COUT is the output charge storage capacitor. Both the style and value of the output capacitor can significantly affect the stability of the LTC3200/LTC3200-5. As shown in the Block Diagrams, the LTC3200/LTC3200-5 use a linear control loop to adjust the strength of the charge pump to match the current required at the output. The error signal of this loop is stored directly on the output charge storage capacitor. The charge storage capacitor also serves to form the dominant pole for the control loop. To prevent ringing or instability on the LTC3200-5 it is important for the output capacitor to maintain at least 0.47µF of capacitance over all conditions. On the adjustable LTC3200 the output capacitor should be at least 0.47µF × 5V/VOUT to account for the alternate gain factor. The style and value of capacitors used with the LTC3200/ LTC3200-5 determine several important parameters such as regulator control loop stability, output ripple, charge pump strength and minimum start-up time. Likewise excessive ESR on the output capacitor will tend to degrade the loop stability of the LTC3200/LTC3200-5. The closed loop output resistance of the LTC3200-5 is designed to be 0.5Ω. For a 100mA load current change, the output voltage will change by about 50mV. If the output capacitor has 0.3Ω or more of ESR, the closed loop frequency response will cease to roll off in a simple one pole fashion and poor load transient response or instability could result. Ceramic capacitors typically have exceptional ESR performance and combined with a tight board layout should yield very good stability and load transient performance. To reduce noise and ripple, it is recommended that low ESR (< 0.1Ω) ceramic capacitors be used for both CIN and COUT. These capacitors should be 0.47µF or greater. As the value of COUT controls the amount of output ripple, the value of CIN controls the amount of ripple present at the input pin (VIN). The input current to the 8 –50 75 0 25 50 –25 AMBIENT TEMPERATURE (°C) 100 32005 • F03 Figure 3. Typical ROL vs Temperature VIN, VOUT Capacitor Selection 7 LTC3200/LTC3200-5 U OPERATIO LTC3200/LTC3200-5 will be relatively constant while the charge pump is on either the input charging phase or the output charging phase but will drop to zero during the clock nonoverlap times. Since the nonoverlap time is small (~25ns), these missing “notches” will result in only a small perturbation on the input power supply line. Note that a higher ESR capacitor such as tantalum will have higher input noise due to the input current change times the ESR. Therefore ceramic capacitors are again recommended for their exceptional ESR performance. Further input noise reduction can be achieved by powering the LTC3200/LTC3200-5 through a very small series inductor as shown in Figure 4. A 10nH inductor will reject the fast current notches, thereby presenting a nearly constant current load to the input power supply. For economy the 10nH inductor can be fabricated on the PC board with about 1cm (0.4") of PC board trace. 10nH VIN VIN 0.22µF 1µF LTC3200/ LTC3200-5 GND 32005 F02 Figure 4. 10nH Inductor Used for Additional Input Noise Reduction Flying Capacitor Selection Warning: A polarized capacitor such as tantalum or aluminum should never be used for the flying capacitor since its voltage can reverse upon start-up of the LTC3200/ LTC3200-5. Low ESR ceramic capacitors should always be used for the flying capacitor. The flying capacitor controls the strength of the charge pump. In order to achieve the rated output current it is necessary to have at least 0.68µF of capacitance for the flying capacitor. For very light load applications the flying capacitor may be reduced to save space or cost. The theoretical minimum output resistance of a voltage doubling charge pump is given by: 8 ROL(MIN) ≡ 2VIN – VOUT IOUT ≅ 1 fOSCC FLY Where fOSC is the switching frequency (2MHz typ) and CFLY is the value of the flying capacitor. The charge pump will typically be weaker than the theoretical limit due to additional switch resistance, however for very light load applications the above expression can be used as a guideline in determining a starting capacitor value. Ceramic Capacitors Ceramic capacitors of different materials lose their capacitance with higher temperature and voltage at different rates. For example, a capacitor made of X5R or X7R material will retain most of its capacitance from – 40°C to 85°C whereas a Z5U or Y5V style capacitor will lose considerable capacitance over that range. Z5U and Y5V capacitors may also have a very poor voltage coefficient causing them to lose 60% or more of their capacitance when the rated voltage is applied. Therefore, when comparing different capacitors it is often more appropriate to compare the amount of achievable capacitance for a given case size rather than discussing the specified capacitance value. For example, over rated voltage and temperature conditions, a 1µF, 10V, Y5V ceramic capacitor in an 0603 case may not provide any more capacitance than a 0.22µF, 10V, X7R available in the same 0603 case. In fact for most LTC3200/LTC3200-5 applications these capacitors can be considered roughly equivalent . The capacitor manufacturer’s data sheet should be consulted to determine what value of capacitor is needed to ensure the desired capacitance at all temperatures and voltages. Below is a list of ceramic capacitor manufacturers and how to contact them: AVX www.avxcorp.com Kemet www.kemet.com Murata www.murata.com Taiyo Yuden www.t-yuden.com Vishay www.vishay.com LTC3200/LTC3200-5 U OPERATIO Power Efficiency Layout Considerations The power efficiency (η) of the LTC3200/LTC3200-5 is similar to that of a linear regulator with an effective input voltage of twice the actual input voltage. This occurs because the input current for a voltage doubling charge pump is approximately twice the output current. In an ideal regulating voltage doubler the power efficiency would be given by: Due to its high switching frequency and the high transient currents produced by the LTC3200/LTC3200-5, careful board layout is necessary. A true ground plane and short connections to all capacitors will improve performance and ensure proper regulation under all conditions. Figure 5 shows an example layout for the LTC3200-5. Thermal Management VOUT • IOUT VOUT P η ≡ OUT = = 2VIN PIN VIN • 2IOUT At moderate to high output power the switching losses and quiescent current of the LTC3200/LTC3200-5 are negligible and the expression above is valid. For example with VIN = 3V, IOUT = 50mA and VOUT regulating to 5V the measured efficiency is 80% which is in close agreement with the theoretical 83.3% calculation. Operation at VIN > 5V LTC3200/LTC3200-5 will continue to operate with input voltages somewhat above 5V. However, because of its constant frequency nature, some charge due to internal switching will be coupled to VOUT causing a slight upward movement of the output voltage at very light loads. To avoid an output overvoltage problem with high VIN, a moderate standing load current of 1mA will help the LTC3200/LTC3200-5 maintain exceptional line regulation. This can be achieved with a 5k resistor from VOUT to GND. For higher input voltages and maximum output current there can be substantial power dissipation in the LTC3200/ LTC3200-5. If the junction temperature increases above approximately 160°C the thermal shutdown circuitry will automatically deactivate the output. To reduce the maximum junction temperature, a good thermal connection to the PC board is recommended. Connecting the GND pin (Pins 4/5 for LTC3200, Pin 2 for LTC3200-5) to a ground plane, and maintaining a solid ground plane under the device on two layers of the PC board can reduce the thermal resistance of the package and PC board considerably. Derating Power at Higher Temperatures To prevent an overtemperature condition in high power applications Figure 6 should be used to determine the maximum combination of ambient temperature and power dissipation. 1.2 θJA = 175°C/W TJ = 160°C VIN VOUT 1µF 1µF GND 1µF POWER DISSIPATION (W) 1.0 0.8 0.6 0.4 0.2 SHDN LTC3200-5 0 –50 32005 F03 Figure 5. Recommended Layout 0 25 50 75 –25 AMBIENT TEMPERATURE (°C) 100 32005 • F06 Figure 6. Maximum Power Dissipation vs Ambient Temperature 9 LTC3200/LTC3200-5 U OPERATIO The power dissipated in the LTC3200/LTC3200-5 should always fall under the line shown for a given ambient temperature. The power dissipated in the LTC3200/ LTC3200-5 is given by the expression: PD ≡ (2VIN – VOUT)IOUT This derating curve assumes a maximum thermal resistance, θJA, of 175°C/W for both the 6 pin ThinSOT LTC3200-5 and the 8 pin MSOP adjustable LTC3200 which can be achieved from a printed circuit board layout with a solid ground plane and a good connection to the ground pins of the LTC3200/LTC3200-5. Operation outside of this curve will cause the junction temperature to exceed 160°C which may trigger the thermal shutdown circuitry. U PACKAGE DESCRIPTIO MS8 Package 8-Lead Plastic MSOP (LTC DWG # 05-08-1660) 0.043 (1.10) MAX 0.007 (0.18) 0.034 (0.86) REF 8 7 6 5 0° – 6° TYP 0.021 ± 0.006 (0.53 ± 0.015) SEATING PLANE 0.009 – 0.015 (0.22 – 0.38) 0.0256 (0.65) BSC 0.005 ± 0.002 (0.13 ± 0.05) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 10 0.118 ± 0.004* (3.00 ± 0.102) 0.118 ± 0.004** (3.00 ± 0.102) 0.193 ± 0.006 (4.90 ± 0.15) 1 2 3 4 MSOP (MS8) 1100 LTC3200/LTC3200-5 U PACKAGE DESCRIPTIO S6 Package 6-Lead Plastic ThinSOT-23 (LTC DWG # 05-08-1634) 2.80 – 3.10 (.110 – .118) (NOTE 3) SOT-23 (Original) SOT-23 (ThinSOT) A .90 – 1.45 (.035 – .057) 1.00 MAX (.039 MAX) A1 .00 – 0.15 (.00 – .006) .01 – .10 (.0004 – .004) A2 .90 – 1.30 (.035 – .051) .80 – .90 (.031 – .035) L .35 – .55 (.014 – .021) .30 – .50 REF (.012 – .019 REF) 2.60 – 3.00 (.102 – .118) 1.50 – 1.75 (.059 – .069) (NOTE 3) PIN ONE ID .95 (.037) REF .25 – .50 (.010 – .020) (6PLCS, NOTE 2) .20 (.008) A DATUM ‘A’ L NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) .09 – .20 (.004 – .008) (NOTE 2) A2 1.90 (.074) REF A1 S6 SOT-23 0401 3. DRAWING NOT TO SCALE 4. DIMENSIONS ARE INCLUSIVE OF PLATING 5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 6. MOLD FLASH SHALL NOT EXCEED .254mm 7. PACKAGE EIAJ REFERENCE IS: SC-74A (EIAJ) FOR ORIGINAL JEDEL MO-193 FOR THIN Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 11 LTC3200/LTC3200-5 U TYPICAL APPLICATIO S White or Blue LED Driver with LED Current Control 1µF 1 2 3V TO 4.4V Li-Ion BATTERY C 3 + C– VOUT VIN 1µF 1µF LTC3200 FB ON OFF 6 SGND SHDN UP TO 6 LEDS 8 PGND 7 5 82Ω 82Ω 82Ω 82Ω 82Ω 82Ω 4 32005 TA04 (APPLY PWM WAVEFORM FOR ADJUSTABLE BRIGHTNESS CONTROL) VSHDN t Lithium-Ion Battery to 5V White or Blue LED Driver 1µF 4 5 3V TO 4.4V Li-Ion BATTERY 1µF VIN 6 C+ 1 VOUT DRIVE UP TO 5 LEDS SHDN (APPLY PWM WAVEFORM FOR ADJUSTABLE BRIGHTNESS CONTROL) 100Ω 1µF LTC3200-5 3 ON OFF C– GND 100Ω 100Ω 100Ω 100Ω 2 VSHDN 3200-5 TA03 t USB Port to Regulated 5V Power Supply 1µF 4 6 5 3 1 LTC3200-5 1µF 1µF VOUT 5V ±4% 50mA 2 32005 TA05 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1682/-3.3/-5 Doubler Charge Pumps with Low Noise LDO MS8 and SO-8 Packages , IOUT = 80mA, Output Noise = 60µVRMS LTC1751/-3.3/-5 Doubler Charge Pumps VOUT = 5V at 100mA; VOUT = 3.3V at 80mA; ADJ; MSOP Packages LTC1754-3.3/-5 Doubler Charge Pumps with Shutdown ThinSOT Package; IQ = 13µA; IOUT = 50mA LTC1928-5 Doubler Charge Pump with Low Noise LDO ThinSOT Output Noise = 60µVRMS; VOUT = 5V; VIN = 2.7V to 4V 12 Linear Technology Corporation 32005f LT/TP 0501 2K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com LINEAR TECHNOLOGY CORPORATION 2000