Datasheet

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LTC1263

12V, 60mA Flash Memory

Programming Supply

■

Guaranteed 60mA Output

■

Regulated 12V

5% Output Voltage

■

No Inductors

■

Supply Voltage Range: 4.75V to 5.5V

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0.5µA Typ in Shutdown

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Low Power: I

= 300µA

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8-Pin SO Package

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Same Pinout as LTC1262 and MAX662

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.

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.

The LTC1263 is available in an 8-pin SO package.

FEATURES

DESCRIPTION

, LTC and LT are registered trademarks of Linear Technology Corporation.

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12V Flash Memory Programming Supplies

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Compact 12V Op Amp Supplies

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Battery-Powered Systems

APPLICATIONS

TYPICAL APPLICATION

Flash Memory Programming Supply Output Voltage vs Load

SHDN



OUT



–



+

–



LTC1263

0.47µF

LTC1263 • TA01

10µF

CC

4.75V TO 5.5V

VPP

µP

FLASH

MEMORY

GND

10µF

SHDN

12V

LOAD CURRENT (mA)

0 20 40 60 80 100

OUTPUT VOLTAGE (V)

LTC1263 • TA02

13.0

12.8

12.6

12.4

12.2

12.0

11.8

11.6

11.4

11.2

11.0

Summary of content (8 pages)

PAGE 1
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.
PAGE 2
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)..................
PAGE 3
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.
PAGE 4
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.
PAGE 5
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).
PAGE 6
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.
PAGE 7
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.
PAGE 8
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.