LINER LTC1263IS8

LTC1263
12V, 60mA Flash Memory
Programming Supply
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DESCRIPTION
FEATURES
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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
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APPLICATIONS
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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.
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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
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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
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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
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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
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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
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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
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LTC1263
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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
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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
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LTC1263
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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
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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 –
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4
90.1k
6
(VIN)(10)
LTC1263
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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
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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
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LTC1263
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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.
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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