LTC1263 [Linear]
12V, 60mA Flash Memory Programming Supply; 12V ， 60毫安闪存存储器编程电源
| 型号： | LTC1263 |
| 厂家： | 
Linear |
| 描述： | 12V, 60mA Flash Memory Programming Supply |
| 文件： | 总8页 (文件大小：225K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
mountablecircuit. Theoutputcanbemomentarilyshorted
to ground without damaging the part.
■
Guaranteed 60mA Output
Regulated 12V
No Inductors
■
±5% Output Voltage
■
■
■
■
■
■
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
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.
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
TYPICAL APPLICATION
Flash Memory Programming Supply
Output Voltage vs Load
13.0
12.8
12.6
12.4
12.2
12.0
11.8
11.6
11.4
11.2
11.0
V
CC
4.75V TO 5.5V
10µF
SHDN
5V
µP
V
ON
CC
–
C1
C1
C2
C2
SHDN
0.47µF
0.47µF
+
–
+
FLASH
MEMORY
12V
LTC1263
GND
V
VPP
OUT
10µF
0
20
40
60
80
100
LTC1263 • TA01
LOAD CURRENT (mA)
LTC1263 • TA02
1
LTC1263
W W U W
U
W U
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
(Note 1)
TOP VIEW
ORDER PART
NUMBER
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
C1
C2
C2
1
2
3
4
8
7
6
5
SHDN
GND
LTC1263CS8
V
OUT
V
CC
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
0mA ≤ I ≤ 60mA, V = 0V
SHDN
MIN
TYP
MAX
12.6
1.0
UNITS
V
V
OUT
Output Voltage
●
●
●
11.4
OUT
I
I
f
Supply Current
No Load, V
No Load, V
= 0V
0.32
0.5
300
76
mA
µA
kHz
%
CC
SHDN
SHDN
Shutdown Supply Current
Oscillator Frequency
Power Efficiency
= V
10
SHDN
OSC
CC
V
CC
V
CC
V
CC
= 5V, I
= 5V, I
= 60mA
= 60mA
OUT
OUT
R
SW
V
to V
Switch Impedance
= V
= 5V, I = 0mA
OUT
●
●
●
●
●
0.3
1
kΩ
V
CC
OUT
SHDN
V
V
SHDN Input High Voltage
SHDN Input Low Voltage
SHDN Input Current
2.4
IH
0.8
–5
10
V
IL
V
V
= 5V, V
= 5V, V
= 0V
– 40
–10
– 20
0
µA
µA
µs
CC
SHDN
SHDN
= 5V
CC
t
t
Turn-On Time
Turn-Off Time
C1 = C2 = 0.47µF, C3 = C4 = 10µF (Note 4) (Figures 1, 2)
C1 = C2 = 0.47µF, C3 = C4 = 10µF (Figures 1, 2)
600
10
ON
OFF
ms
The
●
denotes specifications which apply over the full operating
Note 3: All typicals are given at V = 5V, T = 25°C.
CC A
temperature range.
Note 4: A higher value output capacitor can be used but the “turn-on” and
Note 1: Absolute Maximum Ratings are those values beyond which the life
“turn-off” time will increase proportionally.
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
LTC1263
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current
Output Voltage
Supply Current
220
215
210
205
200
195
190
185
180
328
326
324
322
320
318
316
314
312
12.8
12.6
12.4
12.2
12.0
11.8
11.6
11.4
11.2
I
= 60mA
OUT
V
= 5V
I
= 0
CC
OUT
V
= 5V
CC
V
= 4.75V
CC
I
= 60mA
= 90mA
OUT
V
= 5V
CC
I
= 0mA
OUT
I
OUT
V
= 5.5V
CC
25 45
25 45
TEMPERATURE (°C)
25 45
TEMPERATURE (°C)
–55 –35 –15
5
65 85 105
–55 –35 –15
5
65 85 105
–55 –35 –15
5
65 85 105
TEMPERATURE (°C)
LTC1263 • TPC03
LTC1263 • TPC01
LTC1263 • TPC02
Output Voltage
Oscillator Frequency
460
420
380
340
300
260
220
180
140
12.8
12.6
12.4
12.2
12.0
11.8
11.6
11.4
11.2
T
= 25°C
A
I
= 0mA, 60mA
OUT
I
= 90mA
OUT
25 45
TEMPERATURE (°C)
5.1 5.2
–55 –35 –15
5
65 85 105
4.7 4.8 4.9 5.0
5.3 5.4 5.5
SUPPLY VOLTAGE (V)
LTC1263 • TPC05
LTC1263 • TPC04
U
U
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PIN FUNCTIONS
C1– (Pin1):First Charge CapacitorNegativeInput. Connect
VCC (Pin 5): Positive Supply Input. 4.75V ≤ VCC ≤ 5.5V.
Requires a 10µF bypass capacitor to ground (C4).
a 0.47µF capacitor (C1) between C1+ and C1–.
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–.
GND (Pin 7): Ground.
C2+ (Pin 4): Second Charge Capacitor Positive Input.
Connect a 0.47µF capacitor (C2) between C2+ and C2–.
SHDN(Pin8):Active-HighTTLLogicLevelShutdownPin.
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
V
CC
C
C
IN
S3A
R1
SHDN
+
C1
S3C
S1
C1
C2
S4A
S3B
V
OUT
–
C1
S4C
OUT
R2
–
+
+
V
DIV
C2
V
BGAP
BANDGAP
REFERENCE
R3
S2
S4B
–
C2
CLK
OSCILLATOR
GND
S3D
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 V < V – V . AT OSCILLATOR OUTPUT HIGH, S3A, S3B, S3C AND S3D
DIV
BGAP
HYST
OPEN WHILE S4A, S4B AND S4C CLOSE TO CHARGE V . COMPARATOR HYSTERESIS IS ±V
OUT
HYST
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W
TIMING DIAGRAMS
t
t
ON
OFF
V
OUT
12V
V
OUT
5.1V
V
V
CC
CC
V
SHDN
1.4V
1.4V
0V
LTC1263 • F01
Figure 1. Timing Diagram
1
2
3
4
8
7
6
5
–
+
–
+
C1
C1
C2
C2
SHDN
GND
V
V
SHDN
OUT
C1 = 0.47µF
C2 = 0.47µF
C3 = 10µF
LTC1263
V
OUT
C4 = 10µF
V
CC
V
CC
4.75V TO 5.5V
LTC1263 • F02
Figure 2. Timing Circuit
4
LTC1263
U
OPERATION
oscillator pulses are prevented from clocking the charge
pump. As a result, VOUT drops until VDIV is below VBGAP by
VHYST again.
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
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, oscilla-
tor 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 tOFF 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
reachthelowerregulationlimitof11.4V(seetON inFigure1).
COUT, which enables VOUT to rise.
VOUT isregulatedtowithin5%of12Vbyanoscillatorpulse
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 compara-
tor, then oscillator pulses are applied to the charge pump
to raise VOUT. When VDIV is above VBGAP by VHYST, the
V
CC
V
OUT
C
OUT
V
+
CC
+
+
C2
C1
C2
+
C1
LTC1263 • F04
LTC1263 • F03
Figure 3. C1 and C2 Charge to VCC
Figure 4. C1 and C2 Stacked in Series with C1– Tied to VCC
U
W U U
APPLICATIONS INFORMATION
Choice of Capacitors
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.
TheLTC1263istestedwiththecapacitorsshowninFigure
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.
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
tendstoincreaseVOUT ripple. Ceramicortantalumcapaci-
tors are recommended for COUT if minimum ripple is
Table 1. Recommended Capacitor Types and Values
CAPACITOR
CERAMIC
TANTALUM
ALUMINUM
C1, C2
0.47µF to 1µF Not Recommended Not Recommended
C
10µF (Min)
10µF (Min)
10µF (Min)
10µF (Min)
10µF (Min)
10µF (Min)
OUT
C
IN
5
LTC1263
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W U U
APPLICATIONS INFORMATION
desired. (The LTC1263 does not require a 0.1µF capacitor
between VCC and VOUT for stability.)
twodiodesandtwocapacitors.Outputvoltagesof19Vand
–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
2
3
4
8
7
6
5
1
2
8
7
6
5
–
+
–
+
–
+
–
+
C1
C1
C2
C2
SHDN
GND
C1
C1
C2
C2
SHDN
GND
0.47µF
0.47µF
0.47µF
0.47µF
LTC1263
LTC1263
10µF
10µF
3
V
OUT
V
OUT
V
= 12V
V
OUT
= 12V
OUT
10µF
10µF
4
V
CC
V
CC
IN4148*
V
V
CC
CC
1µF
4.75V TO 5.5V
4.75V TO 5.5V
1µF
1N4148*
1N4148*
+
V
= 19V**
IN4148*
1µF
*FOR LOWER VOLTAGE DROP, USE SCHOTTKY DIODES
1µF
+
**MUST PULL MORE CURRENT OUT OF V
THAN V
OUT
LTC1263 • TA05
LTC1263 • TA04
–
V
= –7V**
*FOR LOWER VOLTAGE DROP, USE SCHOTTKY DIODES
–
**MUST PULL MORE CURRENT OUT OF V
THAN V
OUT
Gain of 10 Amplifier Using LT®1006 Powered by LTC1263
(12V)
1
2
3
4
8
7
6
5
–
+
–
+
C1
C1
C2
C2
SHDN
GND
0.47µF
0.47µF
7
10k
–
+
2
90.1k
(V )(10)
6
LTC1263
10µF
V
= 12V
LT1006
OUT
IN
V
OUT
3
V
IN
10µF
4
V
CC
V
CC
1µF
4.75V TO 5.5V
1N4148*
1N4148*
(–7V)**
LTC1263 • TA06
1µF
*FOR LOWER VOLTAGE DROP, USE SCHOTTKY DIODES
–
**MUST PULL MORE CURRENT OUT OF V
THAN V
OUT
6
LTC1263
U
TYPICAL APPLICATIONS
Dual Voltage Supply Output at 12V and –12V
FROM µP
1
2
3
4
8
7
6
5
–
+
–
+
C1
C1
C2
C2
SHDN
GND
*
0.47µF
+
10µF
LTC1263
+
V
OUT
V
OUT
12V
10µF
0.47µF
+
+
V
CC
V
CC
4.75 TO 5.5V
*
*
1
2
3
4
8
7
6
5
+
BOOST
V
100pF
+
C1
OSC
LTC1144
+
10µF
GND
SHDN
LTC1263 • TA03
–
–12V
C1
V
OUT
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)
7
5
8
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
3
4
2
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0695
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LTC1263
TYPICAL APPLICATION
U
5V to 3.3V/5A Converter with 12V/60mA Auxiliary Output
1
2
3
4
–
+
–
+
8
7
6
5
C1
C1
C2
C2
SHDN
GND
0.47µF
0.47µF
LTC1263
10µF
V
OUT
12V
V
OUT
60mA
V
5V
IN
V
CC
10µF
220µF*
8V
× 3
+
TP0610
Si4410DY
0.1µF
3µH
10A
0.01Ω
2W
3
10
6
1
8
V
V
P DRIVE
SENSE+
SENSE–
N DRIVE
PGND
VN2222
IN
OUT
3.3V
5A
100Ω
SHDN
SHUTDOWN
LTC1148-3.3
1000pF
MBRS120T3
100Ω
330µF
6.3V
7
+
I
TH
0S-CON
× 2
4
14
12
C
Si4410DY
T
510Ω
150pF
11
SGND
3300pF
Burst ModeTM OPERATION
DEFEAT; USE IF REQUIRED
22k
LTC1263 • TA07
*PANASONIC BCGCOKB220R OR EQUIVALENT
Burst Mode IS A TRADEMARK OF LINEAR TECHNOLOGY CORPORATION.
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OUT
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Regulating Positive to Negative Charge Pump
1263f LT/MP 0397 7K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1996
Linear Technology Corporation
●
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900
8
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
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