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LTC1263 12V, 60mA Flash Memory Programming Supply
FEATURES
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DESCRIPTION
The LTC (R)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 0.5A. The LTC1263 is available in an 8-pin SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Guaranteed 60mA Output Regulated 12V 5% Output Voltage No Inductors Supply Voltage Range: 4.75V to 5.5V ICC 0.5A Typ in Shutdown Low Power: ICC = 300A 8-Pin SO Package Same Pinout as LTC1262 and MAX662
APPLICATIONS
s s s
12V Flash Memory Programming Supplies Compact 12V Op Amp Supplies Battery-Powered Systems
TYPICAL APPLICATION
Flash Memory Programming Supply
VCC 4.75V TO 5.5V
13.0 12.8 12.6
OUTPUT VOLTAGE (V)
10F SHDN C1 0.47F C1+ LTC1263 C2 - 0.47F C2+ VOUT GND 12V 5V FLASH MEMORY VPP
-
12.4 12.2 12.0 11.8 11.6 11.4 11.2
VCC
SHDN
ON
P
10F
LTC1263 * TA01
11.0 0 20 40 60 80 LOAD CURRENT (mA) 100
LTC1263 * TA02
U
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Output Voltage vs Load
1
LTC1263
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW C1- 1 C1+ 2 C2
-
Supply Voltage (VDD) ................................................. 6V Input Voltage (SHDN) ..................... - 0.3V to VCC + 0.3V IOUT Continuous.................................................... 90mA Operating Temperature Range ..................... 0C to 70C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
8 SHDN 7 GND 6 VOUT 5 VCC
ORDER PART NUMBER LTC1263CS8
3
C2 + 4
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 125C, JA = 150C/ W
Consult factory for Industrial and Military grade parts and TSSOP package option.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER VOUT ICC ISHDN fOSC Output Voltage Supply Current Shutdown Supply Current Oscillator Frequency Power Efficiency RSW VIH VIL VCC to VOUT Switch Impedance SHDN Input High Voltage SHDN Input Low Voltage SHDN Input Current CONDITIONS
4.75V VCC 5.5V, TA = 0C to 70C (Notes 2, 3).
MIN
q q q
TYP
MAX 12.6
UNITS V mA A kHz %
0mA IOUT 60mA, VSHDN = 0V No Load, VSHDN = 0V No Load, VSHDN = VCC VCC = 5V, IOUT = 60mA VCC = 5V, IOUT = 60mA VCC = VSHDN = 5V, IOUT = 0mA
11.4 0.32 0.5 300 76
1.0 10
q q q
0.3 2.4
1
0.8 - 40 - 10 - 20 0 600 10 -5 10
VCC = 5V, VSHDN = 0V VCC = 5V, VSHDN = 5V
q q
tON tOFF
Turn-On Time Turn-Off Time
C1 = C2 = 0.47F, C3 = C4 = 10F (Note 4) (Figures 1, 2) C1 = C2 = 0.47F, C3 = C4 = 10F (Figures 1, 2)
The q 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.
Note 3: All typicals are given at VCC = 5V, TA = 25C. Note 4: A higher value output capacitor can be used but the "turn-on" and "turn-off" time will increase proportionally.
2
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W
k V V A A s ms
LTC1263 TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current
328 326 IOUT = 0 12.8 12.6 VCC = 5V
SUPPLY CURRENT (mA)
SUPPLY CURRENT (A)
OUTPUT VOLTAGE (V)
324 322 320 318 316 314 312 -55 -35 -15 5 25 45 65 TEMPERATURE (C) 85 105
LTC1263 * TPC01
VCC = 5V
Output Voltage
12.8 12.6 TA = 25C 460 420 380 IOUT = 0mA, 60mA
OUTPUT VOLTAGE (V)
12.4
FREQUENCY (kHz)
12.2 12.0 11.8 11.6 11.4 11.2 4.7 4.8
IOUT = 90mA
4.9 5.0 5.1 5.2 5.3 SUPPLY VOLTAGE (V)
PIN FUNCTIONS
C1- (Pin 1): First Charge Capacitor Negative Input. Connect a 0.47F capacitor (C1) between C1+ and C1-. C1+ (Pin 2): First Charge Capacitor Positive Input. Connect a 0.47F capacitor (C1) between C1+ and C1-. C2- (Pin 3): Second Charge Capacitor Negative Input. Connect a 0.47F capacitor (C2) between C2+ and C2-. C2+ (Pin 4): Second Charge Capacitor Positive Input. Connect a 0.47F capacitor (C2) between C2+ and C2-. VCC (Pin 5): Positive Supply Input. 4.75V VCC 5.5V. Requires a 10F bypass capacitor to ground (C4). VOUT (Pin 6): 12V Output. Requires a 10F or a higher value bypass capacitor to ground (C3). VOUT = VCC when in the shutdown mode. 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.
UW
Output Voltage
220 215 210 205 200 195
Supply Current
IOUT = 60mA
12.4 12.2 IOUT = 60mA 12.0 11.8 11.6 11.4 11.2 -55 -35 -15 5 25 45 65 TEMPERATURE (C) 85 105
LTC1263 * TPC02
VCC = 4.75V VCC = 5V VCC = 5.5V
IOUT = 0mA
IOUT = 90mA
190 185 180 -55 -35 -15 5 25 45 65 TEMPERATURE (C) 85 105
LTC1263 * TPC03
Oscillator Frequency
340 300 260 220 180
5.4 5.5
140 -55 -35 -15 5 25 45 65 TEMPERATURE (C)
85 105
LTC1263 * TPC05
LTC1263 * TPC04
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3
LTC1263
BLOCK DIAGRAM W
VCC S3A S3C S4A C1- S4C S3B C2+ R2 S1 R1 SHDN VOUT COUT CIN S4B CLK S2 S3D CHARGE PUMP
LTC1263 * BD
C1+
C1
C2
C2-
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
TIMING DIAGRAMS
tOFF tON 12V VOUT 5.1V VCC VCC VSHDN 1.4V 1.4V 0V VOUT
Figure 1. Timing Diagram
1 C1 = 0.47F 2 3 C2 = 0.47F 4
C1- C1+
SHDN GND LTC1263 VOUT VCC
8 7 6 5 C3 = 10F
C2 - C2+
Figure 2. Timing Circuit
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-
VBGAP BANDGAP REFERENCE
VDIV R3
+
OSCILLATOR
GND
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UW
LTC1263 * F01
VSHDN
VOUT C4 = 10F
VCC 4.75V TO 5.5V
LTC1263 * F02
LTC1263
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
VCC
VOUT COUT
Figure 3. C1 and C2 Charge to VCC
APPLICATIONS INFORMATION
Choice of Capacitors The LTC1263 is tested with the capacitors shown in Figure 2. C1 and C2 are 0.47F ceramic capacitors and CIN and COUT are 10F tantalum capacitors. Refer to Table 1 if other choices are desired.
Table 1. Recommended Capacitor Types and Values
CAPACITOR C1, C2 COUT CIN CERAMIC 0.47F to 1F 10F (Min) 10F (Min) TANTALUM 10F (Min) 10F (Min) ALUMINUM 10F (Min) 10F (Min) Not Recommended Not Recommended
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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 0.5A. 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 600s (typ) to reach the lower regulation limit of 11.4V (see t ON in Figure 1).
+
C1
+
C2
VCC
+
C2
+
C1
LTC1263 * F04
LTC1263 * F03
Figure 4. C1 and C2 Stacked in Series with C1- Tied to VCC
C1 and C2 should be ceramic capacitors with values in the range of 0.47F to 1F. 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
APPLICATIONS INFORMATION
desired. (The LTC1263 does not require a 0.1F capacitor between VCC and VOUT for stability.) Besides using it to program flash memories, the LTC1263 can also provide multiple supply voltages with the help of 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.
TYPICAL APPLICATIONS
Dual Voltage Supply Output at 12V and 19V
1 0.47F 2 3 0.47F 4 C1+ LTC1263 C2 - C2+ VOUT VCC 6 5 GND 7 10F VOUT = 12V 10F IN4148* VCC 4.75V TO 5.5V 1N4148* V+ = 19V**
IN4148* 1F
LTC1263 * TA05
C1-
SHDN
8
0.47F
1F
* FOR LOWER VOLTAGE DROP, USE SCHOTTKY DIODES ** MUST PULL MORE CURRENT OUT OF VOUT THAN V +
1F
LTC1263 * TA04
Gain of 10 Amplifier Using LT (R) 1006 Powered by LTC1263
(12V) 1 0.47F 2 3 0.47F 4 1F C1+ LTC1263 C2 - C2+ VOUT VCC 1N4148* 6 5 GND 7 10F 10F VCC 4.75V TO 5.5V C1- SHDN 8 10k 2 7 LT1006 6
1N4148* 1F * FOR LOWER VOLTAGE DROP, USE SCHOTTKY DIODES ** MUST PULL MORE CURRENT OUT OF VOUT THAN V -
(-7V)**
LTC1263 * TA06
6
+
VOUT = 12V 3 VIN
-
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Dual Supply Voltage Output at 12V and - 7V
1 2 3 0.47F 4 1F C1- C1+ LTC1263 C2 - C2+ VOUT VCC 1N4148* 6 5 SHDN GND 8 7 10F VOUT = 12V 10F VCC 4.75V TO 5.5V
V - = -7V** *FOR LOWER VOLTAGE DROP, USE SCHOTTKY DIODES **MUST PULL MORE CURRENT OUT OF VOUT THAN V -
90.1k (VIN)(10)
4
LTC1263
TYPICAL APPLICATIONS
Dual Voltage Supply Output at 12V and - 12V
FROM P 1 0.47F C1- C1+ LTC1263 C2
-
3 0.47F 4
VOUT VCC
6 5
C2+
VCC 4.75 TO 5.5V * * 1 2 BOOST C1+ LTC1144 GND C1- SHDN VOUT V+ OSC 8 100pF 7 6
LTC1263 * TA03
+
10F
3 4
5 10F
*CD4007 OR OTHER HIGH VOLTAGE INVERTER
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
0.228 - 0.244 (5.791 - 6.197)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
0.053 - 0.069 (1.346 - 1.752)
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)
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.
+
+
+
+
+
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SHDN GND
8 7
*
2
10F 10F VOUT 12V
- 12V
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
0.004 - 0.010 (0.101 - 0.254)
0.050 (1.270) BSC
SO8 0695
7
LTC1263
TYPICAL APPLICATION
5V to 3.3V/5A Converter with 12V/60mA Auxiliary Output
0.47F 2 3 0.47F 4 C1+ LTC1263 C2 - C2+ VOUT 6 VCC 5 10F TP0610 0.1F 3 10 6 4 150pF 11 3300pF VIN SHDN ITH CT SGND P DRIVE SENSE+ SENSE- N DRIVE PGND 1 8 7 14 12 22k Burst ModeTM OPERATION DEFEAT; USE IF REQUIRED
LTC1263 * TA07
SHUTDOWN
510
*PANASONIC BCGCOKB220R OR EQUIVALENT Burst Mode IS A TRADEMARK OF LINEAR TECHNOLOGY CORPORATION.
RELATED PARTS
PART NUMBER LTC1044A LT1106/LT1107/LT1108 LTC 1262 LT1301/LT1302/LT1303 LT1312 LTC1429 DESCRIPTION 12V CMOS Voltage Converter Micropower DC/DC Converter, 5V and 12V 12V, 30mA Flash Memory Program Supply Micropower High Efficiency 5V/12V, DC/DC Converter Single PCMCIA VPP Driver/Regulator Regulating Positive to Negative Charge Pump COMMENTS 1.5V to 12V Supply Range, 95% Efficiency, VOUT Adjustable VOUT from VIN = 3V, Use Inductor 1/2 Source Current as LTC1263, Cannot Short VOUT to GND 5V at 600mA or 12V at 120mA, Use Inductor 120mA Output, Current Limit, Thermal Shutdown Fixed - 4.1V or Adjustable Output, No Inductors
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 q (408) 432-1900 FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
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1
C1-
SHDN 8 GND 7 10F VOUT 12V 60mA VIN 5V
+
Si4410DY VN2222 100
220F* 8V x3 0.01 2W
3H 10A
VOUT 3.3V 5A
LTC1148-3.3
1000pF
100
MBRS120T3
+
Si4410DY
330F 6.3V 0S-CON x2
1263f LT/MP 0397 7K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1996

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