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LTC1262IS8#TRMPBF [Linear]

Switched Capacitor Regulator;
LTC1262IS8#TRMPBF
型号： LTC1262IS8#TRMPBF
厂家： Linear    Linear
描述：

Switched Capacitor Regulator

稳压器 开关式稳压器或控制器 闪存 电源电路 存储 开关式控制器
文件： 总8页 (文件大小：223K)
中文：  中文翻译
下载：  下载PDF数据表文档文件
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LTC1262  
12V, 30mA Flash Memory  
Programming Supply  
U
DESCRIPTIO  
EATURE  
S
F
Regulated 12V ±5% Output Voltage  
The LTC®1262 is a regulated 12V, 30mA output DC/DC  
converter. It is designed to provide the 12V ±5% output  
necessary to program byte-wide flash memories. The  
output will provide up to 30mA 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.  
■
■
■
■
■
■
■
No Inductors  
Supply Voltage Range: 4.75V to 5.5V  
Guaranteed 30mA Output  
Low Power: ICC = 500µA  
ICC in Shutdown: 0.5µA  
8-Pin PDIP or SO-8 Package  
O U  
The TTL compatible shutdown pin can be directly con-  
nected to a microprocessor and reduces the supply cur-  
rent to less than 0.5µA. The LTC1262 offers improved  
shutdown current performance and requires fewer exter-  
nal components than competing solutions.  
PPLICATI  
S
A
■
■
■
12V Flash Memory Programming Supplies  
Compact 12V Op Amp Supplies  
Battery-Powered Systems  
The LTC1262 is available in an 8-pin PDIP or SO-8  
package.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
O
TYPICAL APPLICATI  
In/Out of Shutdown  
1
2
3
4
8
7
6
5
–
+
–
+
C1  
C1  
C2  
C2  
SHDN  
GND  
FROM MPU  
0.22µF  
0.22µF  
FLASH  
5V  
SHDN  
MEMORY  
4.7µF  
5V/DIV  
LTC1262  
+
0V  
VPP  
V
OUT  
4.7µF  
+
12V  
V
CC  
V
CC  
VOUT  
5V/DIV  
LTC1262 • TA01  
V
5V  
0V  
CC  
4.75V TO 5.5V  
1ms/DIV  
1262 TA01a  
1
LTC1262  
W W W  
U
/O  
ABSOLUTE AXI U RATI GS  
PACKAGE RDER I FOR ATIO  
(Note 1)  
Supply Voltage (VCC) ................................................ 6V  
Input Voltage (SHDN) ................... –0.3V to VCC + 0.3V  
Output Current (IOUT) ........................................... 50mA  
Operating Temperature Range  
LTC1262C................................................ 0°C to 70°C  
LTC1262I........................................... –40°C to 85°C  
Storage Temperature Range ................ – 65°C to 150°C  
Lead Temperature (Soldering, 10 sec)................. 300°C  
ORDER PART  
TOP VIEW  
NUMBER  
–
C1  
C1  
C2  
C2  
1
2
3
4
SHDN  
GND  
8
7
6
5
+
–
+
LTC1262CN8  
LTC1262CS8  
LTC1262IS8  
V
OUT  
V
CC  
N8 PACKAGE  
8-LEAD PDIP  
S8 PACKAGE  
S8 PART MARKING  
8-LEAD PLASTIC SO  
TJMAX = 150°C, θJA = 100°C/W (N8)  
TJMAX = 150°C, θJA = 150°C/W (S8)  
1262  
1262I  
Consult factory for Military grade parts.  
ELECTRICAL CHARACTERISTICS  
VCC = 4.75V to 5.5V, TA = –40°C to 85°C, (Notes 2, 3), unless otherwise noted.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
V
OUT  
Output Voltage  
0mA ≤ I  
0mA ≤ I  
≤ 30mA, V  
≤ 30mA, V  
= 0V, 0°C ≤ T ≤ 70°C  
●
●
11.4  
11.2  
12.6  
12.6  
V
V
OUT  
OUT  
SHDN  
SHDN  
A
= 0V, –40°C ≤ T ≤ 85°C  
A
I
Supply Current  
No Load, V  
No Load, V  
= 0V, 0°C ≤ T ≤ 70°C  
●
●
0.5  
0.5  
1.0  
1.3  
mA  
mA  
CC  
SHDN  
SHDN  
A
= 0V, –40°C ≤ T ≤ 85°C  
A
I
f
Shutdown Supply Current  
Oscillator Frequency  
Power Efficiency  
No Load, V  
= V  
CC  
●
●
●
●
●
●
0.5  
300  
74  
10  
µA  
kHz  
%
SHDN  
SHDN  
V
V
V
= 5V, I  
= 5V, I  
= 30mA  
= 30mA  
OSC  
CC  
CC  
CC  
OUT  
OUT  
R
V
CC  
to V  
Switch Impedance  
= V  
= 5V, I = 0mA  
OUT  
0.18  
2
kΩ  
V
SW  
OUT  
SHDN  
V
V
SHDN Input High Voltage  
SHDN Input Low Voltage  
SHDN Input Current  
2.4  
IH  
0.8  
V
IL  
V
V
V
= 5V, V  
= 5V, V  
= 5V, V  
= 0V, 0°C ≤ T ≤ 70°C  
●
●
●
–20  
–35  
–10  
–10  
0.06  
–5  
–5  
10  
µA  
µA  
µA  
CC  
CC  
CC  
SHDN  
SHDN  
SHDN  
A
= 0V, –40°C ≤ T ≤ 85°C  
A
= 5V  
t
t
Turn-On Time  
Turn-Off Time  
C1 = C2 = 0.22µF, C = C  
= 4.7µF, (Figures 1, 2)  
= 4.7µF, (Figures 1, 2)  
500  
3.3  
µs  
ON  
IN  
OUT  
OUT  
C1 = C2 = 0.22µF, C = C  
ms  
OFF  
IN  
The  
● denotes specifications which apply over the full operating  
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.  
temperature range.  
Note 1: Absolute maximum ratings are those values beyond which the life  
of the device may be impaired.  
Note 3: All typicals are given at V = 5V, T = 25°C.  
CC  
A
2
LTC1262  
W
U
TYPICAL PERFORMANCE CHARACTERISTICS  
Shutdown Supply Current  
vs Temperature  
Efficiency vs Output Current  
85  
80  
75  
70  
65  
60  
55  
3.6  
V
CC  
= 5V  
V
CC  
= 4.75V  
3.0  
2.4  
1.8  
1.2  
0.6  
0
V
CC  
= 5V  
V
CC  
= 5.5V  
0
20  
30  
40  
50  
–50  
0
25  
50  
75  
100  
10  
–25  
OUTPUT CURRENT (mA)  
TEMPERATURE (°C)  
LTC1262 G01  
LTC1262 G02  
Supply Current vs Supply Voltage  
Output Voltage vs Output Current  
600  
580  
560  
540  
520  
500  
480  
12.2  
12.0  
11.8  
11.6  
11.4  
11.2  
11.0  
10.8  
10.6  
10.4  
10.2  
I
= 0  
OUT  
V
= 4.75V  
CC  
T
= 70°C  
A
V
= 5.5V  
CC  
V
= 5V  
CC  
T
= 25°C  
A
T
= 0°C  
A
4.5  
5.0  
5.25  
5.5  
5.75  
6.0  
4.75  
0
5
10 15 20 25 30 35 40 45 50  
OUTPUT CURRENT (mA)  
1262 G04  
SUPPLY VOLTAGE (V)  
LTC1262 G03  
U
U
U
PI FU CTIO S  
C1– (Pin 1): C1 Negative Input. Connect a 0.22µF capaci-  
VOUT (Pin 6): 12V Output. Connect a 4.7µF bypass capaci-  
tor C1 between C1+ and C1–.  
tor COUT to ground. When in the shutdown mode VOUT  
VCC.  
=
C1+ (Pin 2): C1 Positive Input. Connect a 0.22µF capaci-  
tor C1 between C1+ and C1–.  
GND (Pin 7): Ground.  
C2– (Pin 3):C2 Negative Input. Connect a 0.22µF capaci-  
SHDN (Pin 8): Logic Level Shutdown Pin. Application of a  
logic low at SHDN pin will place the regulator in normal  
operation. With no external connection, or with SHDN tied  
toVCC,thedevicewillbeputintoshutdownmode.Connect  
to GND for normal operation. In shutdown mode the  
charge pump is turned off and VOUT = VCC.  
tor C2 between C2+ and C2–.  
C2+ (Pin 4): C2 Positive Input. Connect a 0.22µF capaci-  
tor C2 between C2+ and C2–.  
VCC (Pin 5): Positive Supply Input Where 4.75V ≤ VCC  
≤ 5.5V. Connect a 4.7µF bypass capacitor CIN to ground.  
3
LTC1262  
W
BLOCK DIAGRAM  
V
CC  
+
C
IN  
S3A  
S3C  
R1  
R2  
+
C1  
D1 S1  
SHDN  
D2  
S4A  
C1  
V
OUT  
+
–
C1  
C2  
C
OUT  
S3B  
–
+
V
DIV  
+
R3  
S2  
BANDGAP  
REFERENCE  
S4B  
C2  
V
BGAP  
–
C2  
S3D  
OSCILLATOR  
GND  
CHARGE  
PUMP  
LTC1262 • BD  
S1 AND S2 SHOWN WITH SHDN PIN LOW.  
S3A, S3B, S3C, S3D, S4A AND S4B SHOWN WITH OSCILLATOR OUTPUT LOW AND V < V  
– V  
.
HYST  
DIV  
BGAP  
COMPARATOR HYSTERISIS IS ±V  
.
HYST  
WU  
W
TI I G DIAGRA S  
1
2
3
4
8
7
6
5
–
C1  
SHDN  
GND  
V
SHUTDOWN  
t
t
OFF  
ON  
C1  
V
OUT  
0.22µF  
V
11.4V  
OUT  
+
–
+
C1  
C2  
C2  
C
OUT  
LTC1262  
+
5.1V  
4.7µF  
V
V
CC  
V
V
OUT  
OUT  
C
IN  
C2  
0.22µF  
+
4.7µF  
CC  
1.4V  
1.4V  
V
V
CC  
SHDN  
0V  
LTC1262 • F01  
LTC1262 • F02  
V
CC  
4.75V TO 5V  
Figure 2. LTC1262 Timing Circuit  
Figure 1. LTC1262 Timing Diagram  
4
LTC1262  
U
W U U  
APPLICATIONS INFORMATION  
Operation  
Choice of Capacitors  
The LTC1262 uses a charge pump tripler to generate 12V  
fromaVCC of5V.Thechargepumpoperateswhenclocked  
by a 300kHz oscillator. When the oscillator output is low,  
C1 and C2 are connected between VCC and GND, charging  
them to VCC. When the oscillator output goes high, C1 and  
C2 are stacked in series with the bottom plate of C1 pulled  
to VCC. The top plate of C2 is switched to charge COUT and  
The LTC1262 is tested with the capacitors shown in  
Figure 2. C1 and C2 are 0.22µF ceramic capacitors and  
CIN and COUT are 4.7µF tantalum capacitors. Refer to  
Table 1 if other choices are desired.  
Table 1. Recommended Capacitor Types and Values  
CAPACITOR  
CERAMIC  
TANTALUM  
ALUMINUM  
C1, C2  
0.22µF to 1µF  
Not  
Not  
V
OUT rises. VOUT is regulated to within 5% of 12V by an  
Recommended  
Recommended  
oscillator pulse gating scheme. A resistor divider senses  
VOUT. When the output of the divider (VDIV) is less than the  
output of a bandgap (VBGAP) by the hysteresis voltage  
(VHYST) of the comparator, oscillator pulses are applied to  
the charge pump to raise VOUT. When VDIV is above VBGAP  
by VHYST, the oscillator pulses are prevented from clock-  
ingthechargepump. VOUT dropsuntilVDIV isbelowVBGAP  
by VHYST again. The gates of all internal switches are  
driven between VOUT and GND. An internal diode ensures  
thattheLTC1262willstartupunderloadbychargingCOUT  
to one diode drop below VCC.  
C
2µF (Min)  
1µF (Min)  
4.7µF (Min)  
4.7µF (Min)  
10µF (Min)  
10µF (Min)  
OUT  
C
IN  
C1 and C2 should be ceramic capacitors with values in the  
range of 0.22µF to 1µF. Higher values provide better load  
regulation. Tantalum capacitors are not recommended as  
the higher ESR of these capacitors degrades performance  
when the load current is above 25mA with 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  
tendstoincreaseVOUT ripple. Ceramicortantalumcapaci-  
tors are recommended for COUT if minimum ripple is  
desired. The LTC1262 does not require a 0.1µF capacitor  
between VCC and VOUT for stability.  
To reduce supply current the LTC1262 may be put into  
shutdown mode by floating the SHDN pin or taking it to  
VCC. In this mode the bandgap, comparator, oscillator and  
resistor divider are switched off to reduce supply current  
to typically 0.5µA. At the same time an internal switch  
shorts VOUT to VCC; VOUT takes 3.3ms to reach 5.1V (see  
tOFF in Figure 1). When the SHDN pin is low, the LTC1262  
exits shutdown and the charge pump operates to raise  
VOUT to 12V. VOUT takes 500µs to reach the lower regula-  
tion limit of 11.4V (see tON in Figure 1).  
Maximum Load Current  
TheLTC1262willsourceupto50mAcontinuouslywithout  
any damage to itself. Do not short the VOUT pin to ground.  
If the VOUT pin is shorted to ground, irreversible damage  
to the device will result.  
5
LTC1262  
U
O
TYPICAL APPLICATI  
5V to 3.3V/10A Converter  
1
8
7
6
5
–
+
–
+
C1  
SHDN  
GND  
C7  
0.22µF  
2
C1  
U2  
LTC1262  
C9  
1µF  
3
C2  
V
OUT  
+
C8  
0.22µF  
4
C2  
V
CC  
V
IN  
5V  
C4  
Q1  
+
+
+
+
220µF  
8V  
TP0610  
× 3  
Q4  
Q3  
PANASONIC  
ECGCOKB220R  
Si9410  
U1  
Si9410  
Q2  
VN7002  
R4  
LTC1148-3.3  
L2  
0.01Ω  
3
1
3µH/10A  
2W  
V
PDRIVE  
IN  
V
3.3V  
10A  
OUT  
C6  
R2  
100Ω  
+
10µF  
10  
8
+
25V  
SHDN  
SENSE  
C3  
1000pF  
R3  
100Ω  
SHUTDOWN  
C5  
330µF  
6.3V  
× 2  
OS-CON  
6
4
7
+
–
I
SENSE  
TH  
R1  
510Ω  
14  
12  
Q5  
Si9410  
D1  
C
T
NDRIVE  
PGND  
MBRS120T3  
11  
C1  
3300pF  
C2  
150pF  
SGND  
R6  
22k  
Burst ModeTM DEFEAT;  
USE IF REQUIRED  
LTC1262 • TA02  
Burst Mode is a trademark of Linear Technology Corporation.  
6
LTC1262  
U
Dimensions in inches (millimeters) unless otherwise noted.  
PACKAGE DESCRIPTION  
N8 Package  
8-Lead PDIP (Narrow 0.300)  
(LTC DWG # 05-08-1510)  
0.400*  
(10.160)  
MAX  
8
7
6
5
4
0.255 ± 0.015*  
(6.477 ± 0.381)  
1
2
3
0.130 ± 0.005  
0.300 – 0.325  
0.045 – 0.065  
(3.302 ± 0.127)  
(1.143 – 1.651)  
(7.620 – 8.255)  
0.065  
(1.651)  
TYP  
0.009 – 0.015  
(0.229 – 0.381)  
0.125  
0.020  
(0.508)  
MIN  
(3.175)  
MIN  
+0.035  
0.325  
–0.015  
0.100 ± 0.010  
(2.540 ± 0.254)  
0.018 ± 0.003  
(0.457 ± 0.076)  
+0.889  
8.255  
(
)
N8 1197  
–0.381  
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.  
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)  
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
0.053 – 0.069  
3
4
2
0.010 – 0.020  
(0.254 – 0.508)  
× 45°  
(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)  
TYP  
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  
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD  
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE  
SO8 0996  
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-  
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.  
7
LTC1262  
U
O
TYPICAL APPLICATI  
Output Voltage vs Output Current for  
Two Paralleled Devices  
Paralleling Devices  
TIE TO V OR FLOAT  
CC  
1
2
3
4
8
7
6
5
–
+
–
+
12.4  
12.2  
12.0  
11.8  
11.6  
11.4  
11.2  
11.0  
10.8  
10.6  
10.4  
TO SHUTDOWN BOTH  
C1  
C1  
C2  
C2  
SHDN  
GND  
V
= 5V  
CC  
DEVICES  
0.22µF  
0.22µF  
10µF  
LTC1262  
+
12V OUTPUT  
V
OUT  
V
= 5.5V  
CC  
10µF  
+
V
= 4.75V  
V
CC  
CC  
V
CC  
1
2
3
4
8
7
6
5
–
+
–
+
4.75V TO  
5.5V  
C1  
C1  
C2  
C2  
SHDN  
GND  
0.22µF  
0.22µF  
LTC1262  
0
10 20 30 40 50 60 70 80 90 100  
OUTPUT CURRENT (mA)  
1262 TA04  
V
OUT  
V
CC  
SEE FIGURE AT LEFT.  
NOTE: KEEP DEVICES CLOSE TOGETHER OR  
USE SEPARATE 4.7µF TANTALUM  
CAPACITORS IF THIS IS NOT POSSBILE.  
LTC1262 • TA03  
RELATED PARTS  
PART NUMBER  
DESCRIPTION  
COMMENTS  
LT1106*  
Micropower Step-Up DC/DC Converter for PCMCIA Card Flash Memory  
PCMCIA Card Power Control, 9µA I  
, Small SMT  
SHDN  
Components, Requires External Inductor  
Three-Lead Z Package, Requires External Inductor  
Requires External Inductor  
LT1109-12  
Micropower Low Cost DC/DC Converter Adjustable and Fixed 12V  
LT1109A-12  
Micropower DC/DC Converter Flash Memory VPP Generator  
Adjustable and Fixed 12V  
LT1301  
Micropower High Efficiency 5V/12V Step-Up DC/DC  
Converter for Flash Memory  
7µA I  
, SMT Inductor and Capacitors  
SHDN  
LT1309  
500kHz Micropower DC/DC Converter for Flash Memory  
Small SMT Inductor and Capacitors, 6µA I  
SHDN  
* See also LT1312/LT1313 PCMCIA VPP drivers/regulators, LT1314/LT1315 PCMCIA switch matrix and the LTC1470/LTC1471/LTC1472 Protected V  
and VPP switching matrices  
CC  
LT/TP 0298 REV A 2K • PRINTED IN USA  
LINEAR TECHNOLOGY CORPORATION 1994  
Linear Technology Corporation  
●
1630McCarthyBlvd.,Milpitas, CA95035-7417 (408)432-1900  
8
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com  

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SI9137DB

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

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SI9137LG

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

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SI9122E

 500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers

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