LTC1263 12V, 60mA Flash Memory Programming Supply U DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ The LTC ®1263 is a regulated 12V, 60mA output DC/DC converter. It provides the 12V ±5% output necessary to program double byte-wide flash memories. The output provides 60mA from input voltages as low as 4.75V without using any inductors. Only four external capacitors are required to complete an extremely small, surface mountable circuit. The output can be momentarily shorted to ground without damaging the part. Guaranteed 60mA Output Regulated 12V ±5% Output Voltage No Inductors Supply Voltage Range: 4.75V to 5.5V ICC 0.5µA Typ in Shutdown Low Power: ICC = 300µA 8-Pin SO Package Same Pinout as LTC1262 and MAX662 U APPLICATIONS ■ ■ 12V Flash Memory Programming Supplies Compact 12V Op Amp Supplies Battery-Powered Systems The LTC1263 is available in an 8-pin SO package. , LTC and LT are registered trademarks of Linear Technology Corporation. U ■ The active high TTL compatible Shutdown pin can be directly connected to a microprocessor. In the shutdown mode, the supply current typically drops to 0.5µA. TYPICAL APPLICATION Flash Memory Programming Supply Output Voltage vs Load 13.0 VCC 4.75V TO 5.5V 12.8 SHDN – C1 VCC SHDN µP ON 0.47µF C1+ 12V LTC1263 C2 – 0.47µF C2+ 5V VOUT FLASH MEMORY VPP OUTPUT VOLTAGE (V) 12.6 10µF 12.4 12.2 12.0 11.8 11.6 11.4 11.2 GND 10µF 11.0 0 LTC1263 • TA01 20 40 60 80 LOAD CURRENT (mA) 100 LTC1263 • TA02 1 LTC1263 U W U U W W W ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) ORDER PART NUMBER TOP VIEW Supply Voltage (VDD) ................................................. 6V Input Voltage (SHDN) ..................... – 0.3V to VCC + 0.3V IOUT Continuous.................................................... 90mA Operating Temperature Range ..................... 0°C to 70°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C C1– 1 8 SHDN C1+ 2 7 GND – 6 VOUT C2 3 C2 + 4 LTC1263CS8 5 VCC S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125°C, θJA = 150°C/ W Consult factory for Industrial and Military grade parts and TSSOP package option. ELECTRICAL CHARACTERISTICS 4.75V ≤ VCC ≤ 5.5V, TA = 0°C to 70°C (Notes 2, 3). SYMBOL PARAMETER CONDITIONS VOUT Output Voltage 0mA ≤ IOUT ≤ 60mA, VSHDN = 0V ● ICC Supply Current No Load, VSHDN = 0V ● ISHDN Shutdown Supply Current No Load, VSHDN = VCC ● fOSC Oscillator Frequency VCC = 5V, IOUT = 60mA 300 kHz Power Efficiency VCC = 5V, IOUT = 60mA 76 % RSW VCC to VOUT Switch Impedance VCC = VSHDN = 5V, IOUT = 0mA VIH SHDN Input High Voltage ● VIL SHDN Input Low Voltage ● SHDN Input Current MIN TYP MAX UNITS 12.6 V 0.32 1.0 mA 0.5 10 µA 11.4 0.3 ● 1 2.4 kΩ V 0.8 V VCC = 5V, VSHDN = 0V ● – 40 – 20 –5 µA VCC = 5V, VSHDN = 5V ● – 10 0 10 µA tON Turn-On Time C1 = C2 = 0.47µF, C3 = C4 = 10µF (Note 4) (Figures 1, 2) 600 µs tOFF Turn-Off Time C1 = C2 = 0.47µF, C3 = C4 = 10µF (Figures 1, 2) 10 ms The ● denotes specifications which apply over the full operating temperature range. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to ground unless otherwise specified. 2 Note 3: All typicals are given at VCC = 5V, TA = 25°C. Note 4: A higher value output capacitor can be used but the “turn-on” and “turn-off” time will increase proportionally. LTC1263 U W TYPICAL PERFORMANCE CHARACTERISTICS Supply Current Output Voltage IOUT = 0 12.6 324 322 VCC = 5V 320 318 316 IOUT = 60mA VCC = 5V 215 12.4 OUTPUT VOLTAGE (V) SUPPLY CURRENT (µA) 326 Supply Current 220 12.8 12.2 IOUT = 60mA 12.0 11.8 IOUT = 0mA IOUT = 90mA 11.6 314 SUPPLY CURRENT (mA) 328 11.2 –55 –35 –15 5 25 45 65 TEMPERATURE (°C) 85 105 LTC1263 • TPC01 85 105 Output Voltage VCC = 5.5V 190 180 –55 –35 –15 5 25 45 65 TEMPERATURE (°C) 85 105 LTC1263 • TPC03 Oscillator Frequency TA = 25°C 420 380 FREQUENCY (kHz) OUTPUT VOLTAGE (V) VCC = 5V 195 460 12.4 IOUT = 0mA, 60mA 12.2 12.0 11.8 IOUT = 90mA 340 300 260 11.6 220 11.4 180 11.2 4.7 VCC = 4.75V 200 LTC1263 • TPC02 12.8 12.6 205 185 11.4 312 –55 –35 –15 5 25 45 65 TEMPERATURE (°C) 210 4.8 4.9 5.0 5.1 5.2 5.3 SUPPLY VOLTAGE (V) 5.4 5.5 140 –55 –35 –15 5 25 45 65 TEMPERATURE (°C) 85 105 LTC1263 • TPC05 LTC1263 • TPC04 U U U PIN FUNCTIONS C1– (Pin 1): First Charge Capacitor Negative Input. Connect a 0.47µF capacitor (C1) between C1+ and C1–. VCC (Pin 5): Positive Supply Input. 4.75V ≤ VCC ≤ 5.5V. Requires a 10µF bypass capacitor to ground (C4). C1+ (Pin 2): First Charge Capacitor Positive Input. Connect a 0.47µF capacitor (C1) between C1+ and C1–. VOUT (Pin 6): 12V Output. Requires a 10µF or a higher value bypass capacitor to ground (C3). VOUT = VCC when in the shutdown mode. C2– (Pin 3): Second Charge Capacitor Negative Input. Connect a 0.47µF capacitor (C2) between C2+ and C2–. C2+ (Pin 4): Second Charge Capacitor Positive Input. Connect a 0.47µF capacitor (C2) between C2+ and C2–. GND (Pin 7): Ground. SHDN (Pin 8): Active-High TTL Logic Level Shutdown Pin. SHDN is internally pulled up to VCC. Connect to GND for normal operation. In shutdown mode, the charge pump is turned off and VOUT = VCC. 3 LTC1263 W BLOCK DIAGRAM VCC S3A C1+ S3C C1 CIN R1 SHDN S1 S4A VOUT C1– S4C COUT R2 S3B – C2+ + C2 S4B C2– VDIV VBGAP BANDGAP REFERENCE R3 CLK S2 OSCILLATOR S3D GND CHARGE PUMP LTC1263 • BD S1 AND S2 SHOWN WITH SHDN PIN LOW. S3A, S3B, S3C, S3D, S4A, S4B AND S4C SHOWN CHARGING C1 AND C2 WITH OSCILLATOR OUTPUT LOW AND VDIV < VBGAP – VHYST. AT OSCILLATOR OUTPUT HIGH, S3A, S3B, S3C AND S3D OPEN WHILE S4A, S4B AND S4C CLOSE TO CHARGE VOUT. COMPARATOR HYSTERESIS IS ±VHYST W UW TIMING DIAGRAMS tOFF tON VOUT 12V VOUT 5.1V VCC VCC VSHDN 1.4V 1.4V 0V LTC1263 • F01 Figure 1. Timing Diagram 1 C1– SHDN 2 C1+ GND 3 C2 – 8 VSHDN C1 = 0.47µF C2 = 0.47µF 4 LTC1263 C2+ VOUT VCC 7 6 5 C3 = 10µF VOUT C4 = 10µF VCC 4.75V TO 5.5V LTC1263 • F02 Figure 2. Timing Circuit 4 LTC1263 U OPERATION The LTC1263 uses a charge pump tripler to generate 12V from a VCC of 5V. The charge pump is clocked by an internal oscillator. The oscillator frequency is not critical and may vary from the typical value of 300kHz. When the oscillator output is low, C1 and C2 are each connected between VCC and GND, charging them to VCC (see Figure 3). When the oscillator output goes high, C1 and C2 are stacked in series with the bottom plate of C1 pulled to VCC (see Figure 4). The top plate of C2 is switched to charge COUT, which enables VOUT to rise. VOUT is regulated to within 5% of 12V by an oscillator pulse gating scheme that turns the charge pump on and off based on the comparator results of VOUT and a reference voltage. First, a resistor divider senses VOUT; if the output of the divider (VDIV) is less than the output of a bandgap (VBGAP) by the hysteresis voltage (VHYST) of the comparator, then oscillator pulses are applied to the charge pump to raise VOUT. When VDIV is above VBGAP by VHYST, the oscillator pulses are prevented from clocking the charge pump. As a result, VOUT drops until VDIV is below VBGAP by VHYST again. To ensure proper start-up when VOUT is lower than VCC and maintain proper operation when VOUT is higher than VCC, the gates of all internal switches are driven between GND and the higher of either VOUT or VCC. To reduce supply current, the LTC1263 may be put into shutdown mode by “floating” the SHDN pin or connecting it to VCC. In this mode, the bandgap, comparator, oscillator and resistor divider are switched off to reduce the supply current to typically 0.5µA. At the same time an internal switch shorts VOUT to VCC; VOUT takes 10ms (typ) to reach 5.1V (see t OFF in Figure 1). When the SHDN pin is low, the LTC1263 exits shutdown and the charge pump operates to raise VOUT to 12V. VOUT takes 600µs (typ) to reach the lower regulation limit of 11.4V (see t ON in Figure 1). VCC VOUT COUT + + VCC + C1 C2 C2 + C1 LTC1263 • F04 LTC1263 • F03 Figure 4. C1 and C2 Stacked in Series with C1– Tied to VCC Figure 3. C1 and C2 Charge to VCC U W U U APPLICATIONS INFORMATION Choice of Capacitors The LTC1263 is tested with the capacitors shown in Figure 2. C1 and C2 are 0.47µF ceramic capacitors and CIN and COUT are 10µF tantalum capacitors. Refer to Table 1 if other choices are desired. Table 1. Recommended Capacitor Types and Values CAPACITOR CERAMIC TANTALUM ALUMINUM C1, C2 0.47µF to 1µF COUT 10µF (Min) 10µF (Min) 10µF (Min) CIN 10µF (Min) 10µF (Min) 10µF (Min) Not Recommended Not Recommended C1 and C2 should be ceramic capacitors with values in the range of 0.47µF to 1µF. Higher values provide better load regulation. Tantalum capacitors are not recommended as the higher ESR of these capacitors degrades performance at high load currents and VCC = 4.75V. CIN and COUT can be ceramic, tantalum or electrolytic capacitors. The ESR of COUT introduces steps in the VOUT waveform whenever the charge pump charges COUT. This tends to increase VOUT ripple. Ceramic or tantalum capacitors are recommended for COUT if minimum ripple is 5 LTC1263 U U W U APPLICATIONS INFORMATION desired. (The LTC1263 does not require a 0.1µF capacitor between VCC and VOUT for stability.) two diodes and two capacitors. Output voltages of 19V and – 7V can easily be obtained. In other words, the LTC1263 can power dual supply (±5V) and single supply (15V) op amps. Besides using it to program flash memories, the LTC1263 can also provide multiple supply voltages with the help of U TYPICAL APPLICATIONS Dual Supply Voltage Output at 12V and – 7V Dual Voltage Supply Output at 12V and 19V 1 C1– SHDN 8 0.47µF 2 C1+ 3 C2 – GND 7 LTC1263 0.47µF 1 C1– SHDN 2 C1+ GND 3 C2 – 8 0.47µF 4 C2+ VOUT VCC LTC1263 10µF 6 VOUT = 12V 10µF 5 0.47µF 4 IN4148* VCC 4.75V TO 5.5V 1µF 7 VOUT C2+ VCC 1µF 10µF 6 VOUT = 12V 10µF 5 VCC 4.75V TO 5.5V 1N4148* 1N4148* V+ = 19V** 1µF IN4148* * FOR LOWER VOLTAGE DROP, USE SCHOTTKY DIODES ** MUST PULL MORE CURRENT OUT OF VOUT THAN V + 1µF LTC1263 • TA05 V – = –7V** LTC1263 • TA04 *FOR LOWER VOLTAGE DROP, USE SCHOTTKY DIODES **MUST PULL MORE CURRENT OUT OF VOUT THAN V – Gain of 10 Amplifier Using LT ® 1006 Powered by LTC1263 (12V) 1 C1– SHDN 2 C1+ GND 8 0.47µF LTC1263 0.47µF 3 C2 – VOUT 4 C2+ VCC 1µF 10k 7 6 5 10µF 10µF 2 VOUT = 12V 3 VIN – + 7 LT1006 VCC 4.75V TO 5.5V 1N4148* 1N4148* (–7V)** LTC1263 • TA06 1µF * FOR LOWER VOLTAGE DROP, USE SCHOTTKY DIODES ** MUST PULL MORE CURRENT OUT OF VOUT THAN V – 6 4 90.1k 6 (VIN)(10) LTC1263 U TYPICAL APPLICATIONS Dual Voltage Supply Output at 12V and – 12V FROM µP 0.47µF + 0.47µF + 1 C1– SHDN 2 C1+ GND 3 – 4 LTC1263 C2 VOUT C2+ VCC 8 * 7 6 + 10µF + 5 VOUT 12V 10µF VCC 4.75 TO 5.5V * * 1 V+ BOOST 8 100pF 2 + 3 10µF 4 C1+ OSC LTC1144 GND C1– SHDN VOUT 7 6 LTC1263 • TA03 5 – 12V + 10µF *CD4007 OR OTHER HIGH VOLTAGE INVERTER U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.189 – 0.197* (4.801 – 5.004) 8 7 6 5 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 2 3 4 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0°– 8° TYP 0.016 – 0.050 0.406 – 1.270 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 0.014 – 0.019 (0.355 – 0.483) 0.050 (1.270) BSC 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. SO8 0695 7 LTC1263 U TYPICAL APPLICATION 5V to 3.3V/5A Converter with 12V/60mA Auxiliary Output 1 C1– 2 C1+ SHDN 8 0.47µF GND 7 LTC1263 0.47µF 3 C2 – VOUT 6 4 C2+ VCC 5 10µF VOUT 12V 60mA + 10µF 220µF* 8V ×3 TP0610 Si4410DY 0.1µF 3 10 SHUTDOWN VIN P DRIVE SHDN SENSE+ 1 4 510Ω 150pF 11 3300pF ITH SENSE– CT N DRIVE SGND PGND 7 3µH 10A 0.01Ω 2W VOUT 3.3V 5A 100Ω 8 LTC1148-3.3 6 VN2222 VIN 5V 1000pF MBRS120T3 100Ω 14 + Si4410DY 330µF 6.3V 0S-CON ×2 12 22k Burst ModeTM OPERATION DEFEAT; USE IF REQUIRED LTC1263 • TA07 *PANASONIC BCGCOKB220R OR EQUIVALENT Burst Mode IS A TRADEMARK OF LINEAR TECHNOLOGY CORPORATION. RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1044A 12V CMOS Voltage Converter 1.5V to 12V Supply Range, 95% Efficiency, ±VOUT LT1106/LT1107/LT1108 Micropower DC/DC Converter, 5V and 12V Adjustable VOUT from VIN = 3V, Use Inductor LTC 1262 12V, 30mA Flash Memory Program Supply 1/2 Source Current as LTC1263, Cannot Short VOUT to GND LT1301/LT1302/LT1303 Micropower High Efficiency 5V/12V, DC/DC Converter 5V at 600mA or 12V at 120mA, Use Inductor LT1312 Single PCMCIA VPP Driver/Regulator 120mA Output, Current Limit, Thermal Shutdown LTC1429 Regulating Positive to Negative Charge Pump Fixed – 4.1V or Adjustable Output, No Inductors 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● (408) 432-1900 FAX: (408) 434-0507● TELEX: 499-3977 ● www.linear-tech.com 1263f LT/MP 0397 7K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1996