LT1303CS8#TRPBF [Linear]
LT1303 - Micropower High Efficiency DC/DC Converters with Low-Battery Detector Adjustable and Fixed 5V; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;型号: | LT1303CS8#TRPBF |
厂家: | Linear |
描述: | LT1303 - Micropower High Efficiency DC/DC Converters with Low-Battery Detector Adjustable and Fixed 5V; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 电池 开关 光电二极管 |
文件: | 总12页 (文件大小:249K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1303/LT1303-5
Micropower High Efficiency
DC/DC Converters with
Low-Battery Detector
Adjustable and Fixed 5V
U
DESCRIPTION
FEATURES
The LT®1303/LT1303-5 are micropower step-up high
efficiency DC/DC converters using Burst ModeTM opera-
tion. They are ideal for use in small, low-voltage battery-
operated systems. The LT1303-5 accepts an input voltage
between1.8Vand5Vandconvertsittoaregulated5V. The
LT1303 is an adjustable version that can supply an output
voltage up to 25V. Quiescent current is only 120µA from
the battery and the shutdown pin further reduces current
to 10µA. The low-battery detector provides an open-
collector output that goes low when the input voltage
drops below a preset level. The on-chip NPN power switch
has a low 170mV saturation voltage at a switch current
of 1A. The LT1303/LT1303-5 are available in 8-lead PDIP
or SO packages, easing board space requirements.
■
5V at 200mA from a 2V Input
■
Supply Voltage As Low As 1.8V
■
Up to 88% Efficiency
120µA Quiescent Current
Low-Battery Detector
Low VCESAT Switch: 170mV at 1A Typ
Uses Inexpensive Surface Mount Inductors
8-Lead PDIP or SO Package
■
■
■
■
■
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APPLICATIONS
■
EL Panel Drivers
■
2-Cell and 3-Cell to 5V Conversion
■
Palmtop Computers
■
Portable Instruments
For higher output current, please see the LT1305 or
LT1302.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
■
Bar-Code Scanners
■
PDAs
■
Wireless Systems
U
TYPICAL APPLICATION
5V Output Efficiency
L1
22µH
1N5817
90
V
= 4V
IN
316k
80
70
60
50
40
30
1%
V
SW
IN
V
= 2V
IN
V = 2.5V
IN
V
, 5V
OUT
LBI
SENSE
200mA
+
V
= 3V
IN
412k
1%
LT1303-5
100µF
2 CELLS
100k
LOW BATTERY
GOES LOW AT
V
SHUTDOWN
SHDN
GND
LBO
PGND
= 2.2V
+
BAT
100µF
L1 = SUMDIA CD54-220
LT1303 TA02
0.1
1
10
100
1000
Figure 1. 2-Cell to 5V DC/DC Converter with Low-Battery Detect
LOAD CURRENT (mA)
LT1303 TA01
1
LT1303/LT1303-5
W W U W
U
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ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
VIN Voltage .............................................................. 10V
SW1 Voltage ............................................................ 25V
Sense Voltage (LT1303-5) ....................................... 20V
FB Voltage (LT1303)................................................ 10V
Shutdown Voltage ................................................... 10V
LBO Voltage............................................................. 10V
LBI Voltage .............................................................. 10V
Maximum Power Dissipation ............................. 500mW
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
TOP VIEW
NUMBER
GND
LBO
1
2
3
4
PGND
SW
8
7
6
5
LT1303CN8
LT1303CS8
LT1303CN8-5
LT1303CS8-5
SHDN
V
IN
FB (SENSE)*
LBI
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
*FIXED VERSION
1303
13035
T
= 100°C, θ = 130°C/W (N8)
JA
= 100°C, θ = 150°C/W (S8)
JA
JMAX
JMAX
T
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
TA = 25°C, VIN = 2.0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Quiescent Current
V
SHDN
V
SHDN
= 0.5V, V = 5V, V = 5.5V
SENSE
= 1.8V
●
●
120
7
200
15
µA
µA
Q
SEL
V
Input Voltage Range
1.8
2.0
1.22
4.8
1.55
V
V
V
V
IN
●
●
●
●
●
●
Feedback Voltage
LT1303
LT1303-5
LT1303 (Note 1)
LT1303-5 (Note 1)
LT1303, V = 1V
1.24
5.0
6
22
7
155
0.2
86
5.6
0.06
130
0.1
1.26
5.2
12.5
50
20
185
Output Sense Voltage
Comparator Hysteresis
Output Hysteresis
Feedback Pin Bias Current
Oscillator Frequency
Oscillator TC
Maximum Duty Cycle
Switch On Time
Output Line Regulation
Switch Saturation Voltage
Switch Leakage Current
Peak Switch Current
mV
mV
nA
kHz
%/°C
%
FB
Current Limit Not Asserted
120
75
DC
●
95
t
Current Limit Not Asserted
1.8V < V < 6V
µs
ON
●
●
●
●
0.15
200
10
1.25
1.15
%/V
mV
µA
A
A
IN
V
CESAT
I
= 700mA
SW
V
SW
= 5V, Switch Off
V
IN
V
IN
= 2V
= 5V
0.75
0.65
1.0
0.9
LBI Trip Voltage
LBI Input Bias Current
LBO Output Low
LBO Leakage Current
Shutdown Pin High
Shutdown Pin Low
Shutdown Pin Bias Current
●
●
●
●
●
1.21
1.24
7
0.11
0.1
1.27
20
0.4
5
V
nA
V
µA
V
V
= 1V
= 100µA
= 1.3V, V
LBI
I
LOAD
V
LBI
= 5V
LBO
V
V
1.8
SHDNH
SHDNL
SHDN
0.5
20
V
I
V
SHDN
V
SHDN
V
SHDN
= 5V
= 2V
= 0V
●
●
●
8.0
3.0
0.1
µA
µA
µA
1
Note 1: Hysteresis specified is DC. Output ripple may be higher if output
capacitance is insufficient or capacitor ESR is excessive.
The
● denotes specifications which apply over the 0°C to 70°C operating
temperature range.
2
LT1303/LT1303-5
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TYPICAL PERFORMANCE CHARACTERISTICS
LT1303-5 Sense Pin Resistance
to Ground
VCESAT vs Switch Current
VCESAT vs Temperature
250
225
200
175
150
125
100
75
1000
900
800
700
600
500
400
300
200
190
I
= 700mA
SW
180
170
160
150
140
130
120
110
100
50
25
0
0.1 1.0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
50
TEMPERATURE (˚C)
100
–50 –25
0
25
75
–50 –25
25
50
75
100
0
SWITCH CURRENT (A)
TEMPERATURE (°C)
LT1303 G01
LT1303 GO3
LT1303 G02
LT1303 FB Voltage
LT1303-5 Sense Voltage
Low Battery Detect Trip Point
5.10
5.08
1.250
1.245
1.250
1.245
5.06
5.04
5.02
1.240
1.235
1.230
1.240
1.235
1.230
5.00
4.98
1.225
1.220
1.225
1.220
4.96
4.94
4.92
4.90
1.215
1.210
1.205
1.200
1.215
1.210
1.205
1.200
–50 –25
25
50
75
100
–50 –25
25
50
75
100
0
0
–50 –25
25
50
75
100
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1303 G05
LT1303 G06
LT1330 G04
LBI Pin Bias Current
FB Pin Bias Current
Switch Current Limit
1.50
1.40
1.30
1.20
1.10
1.00
0.90
0.80
0.70
20
18
20
18
V
= 2V
IN
16
14
12
16
14
12
10
8
10
8
6
4
2
0
6
4
2
0
0.60
–50 –25
25
50
75
100
–50
–25
0
25
75
100
0
50
–50 –25
25
50
75
100
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1303 G07
LT1303 G09
LT1303 G08
3
LT1303/LT1303-5
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Oscillator Frequency
Switch On-Time
Maximum Duty Cycle
8
7
6
5
4
3
2
200
190
100
95
180
170
160
90
85
80
150
140
75
70
130
120
110
100
65
60
55
50
–50
0
25
50
75
100
–25
–50 –25
25
50
75
100
0
–50 –25
25
50
75
100
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1303 G10
LT1303 G11
LT1303 G12
Quiescent Current
Quiescent Current
Switch Current Limit
500
400
300
200
100
0
1200
1100
1000
900
200
SWITCH OFF
L = 33µH
T
= 25°C
A
190
V
= 2V
V
L
= 3V
SWITCH OFF
IN
180
170
160
150
140
130
120
110
100
800
700
0
2
4
6
8
10
0
2
4
6
8
10
–50 –25
25
50
75
100
0
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
LT1303 G14
LT1303 G15
LT1303 G13
Transient Response
Figure 1 Circuit
Low Battery Detector Transient
Response
Shutdown Pin Response
5V
VOUT
100mV/DIV
AC COUPLED
VLBO
2V/DIV
VOUT
1V/DIV
200mA
ILOAD
VTRIP +10mV
0mA
VLBI
VSHDN
5V/DIV
VTRIP –10mV
LT1303 G17
LT1303 G18
200µs/DIV
LT1303 G16
5µs/DIV
500µs/DIV
VIN = 2V
RLOAD = 100Ω
RPULL-UP = 47k
V
OUT = 5V
V
IN = 2V
VOUT = 5V
COUT = 100µF
4
LT1303/LT1303-5
U
U
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PIN FUNCTIONS
GND (Pin 1): Signal Ground. Tie to PGND under the
package.
LBI (Pin 5): Low-Battery Comparator Input. When voltage
on this pin below 1.24V, LBO is low.
LBO (Pin 2): Open-Collector Output of Low-Battery Com-
parator. Can sink 100µA. Disabled when device is in
shutdown.
VIN (Pin 6): Supply Pin. Must be bypassed with a large
valueelectrolytictoground. Keepbypasswithin0.2"ofthe
device.
SHDN (Pin 3): Shutdown. Pull high to shut down the
SW (Pin 7): Switch Pin. Connect inductor and diode here.
Keep layout short and direct to minimize radio frequency
interference.
device. Ground for normal operation.
FB/Sense (Pin 4): On 1303 (adjustable) this pin connects
to the main comparator C1 input. On LT1303-5 this pin
connects to the resistor string that sets output voltage
at 5V.
PGND (Pin 8): Power ground. Tie to signal ground (pin1)
under the package. Bypass capacitor from VIN should be
tied directly to PGND within 0.2" of the device.
W
BLOCK DIAGRA S
D1
L1
V
IN
+
+
V
IN
SW
C1
C2
6
7
18mV
CURRENT
COMPARATOR
+
–
R1
C2
3Ω
R1
R2
HYSTERETIC
COMPARATOR
OFF
FB
4
–
Q2
1×
Q1
160×
A3
DRIVER
OSCILLATOR
C1
REFERENCE
1.24V
+
–
C3
+
SHUTDOWN
3
GND
1
LBI
LBO
PGND
5
2
8
LT1303 BD01
Figure 2. LT1303 Block Digram
5
LT1303/LT1303-5
W
BLOCK DIAGRA S
V
IN
FB
SW
6
7
4
18mV
CURRENT
COMPARATOR
+
–
R1
474k
R1
3Ω
C2
HYSTERETIC
COMPARATOR
OFF
–
Q2
1×
Q1
160×
A3
DRIVER
OSCILLATOR
C1
REFERENCE
1.24V
+
R2
156k
–
C3
+
SHUTDOWN
3
GND
1
LBI
LBO
PGND
5
2
8
LT1303 BD02
Figure 3. LT1303-5 Block Diagram
U
OPERATION
Operation of the LT1303 is best understood by referring to
the Block Diagram in Figure 2. When C1’s negative input,
related to the output voltage by the appropriate resistor-
divider ratio, is higher than the 1.24V reference voltage,
C1’s output is low. C2, A3 and the oscillator are turned off,
drawing no current. Only the reference and C1 consume
current, typically 140µA. When C1’s negative input drops
below 1.24V and overcomes C1’s 6mV hysteresis, C1’s
outputgoeshigh,enablingtheoscillator,currentcompara-
tor C2 and driver A3. Quiescent current increases to 2mA
as the device goes into active switching mode. Q1 then
turns on in controlled saturation for nominally 6µs or until
current comparator C2 trips, whichever comes first. The
switchthenturnsoffforapproximately1.5µs,thenturnson
again. The LT1303’s switching causes current to alter-
nately build up in L1 and dump into output capacitor C4 via
D1, increasing the output voltage. When the output is high
enough to cause C1’s output to go high, switching action
ceases. Capacitor C4 is left to supply current to the load
untilVOUT decreasesenoughtoforceC1’soutputhigh, and
the entire cycle repeats. Figure 4 details relevant wave-
forms. C1’s cycling causes low-to-mid-frequency ripple
voltageontheoutput. Ripplecanbereducedbymakingthe
output capacitor large. The 100µF unit specified results in
ripple of 50mV to 100mV on the 5V output. A 220µF
capacitor will decrease ripple by approximately 50%.
VOUT
100mV/DIV
AC COUPLED
VSW
5V/DIV
IL
1A/DIV
20µs/DIV
LT1303 F04
Figure 4. Burst Mode Operation in Action
Ifswitchcurrentreaches1A, causingC2totrip, switchon-
timeisreducedandoff-timeincreasesslightly.Thisallows
continuous operation during bursts. C2 monitors the
voltage across 3Ω resistor R1 which is directly related to
the switch current. Q2’s collector current is set by the
emitter-area ratio to 0.6% of Q1’s collector current. When
R1’s voltage drop exceeds 18mV, corresponding to 1A
switch current, C2’s output goes high, truncating the on-
time portion of the oscillator cycle and increasing off-time
6
LT1303/LT1303-5
U
OPERATION
to about 2µs. Response time of C2, which determines
hysteresis built in, but hysteresis can be added by
connecting a high-value resistor from LBI to LBO as
shown in Figure 5. The internal reference can be accessed
via the comparator as shown in Figure 6.
minimum on-time, is approximately 300ns.
Low Battery Detector
The low battery detector is enabled when SHDN is low and
disabled when SHDN is high. The comparator has no
V
IN
100k
V
5V
V
IN
BAT
LT1303
LBO
2N3906
R4
47k
LT1303
R1
1.24V
–
+
R2
V
REF
LBI
OUTPUT
+
GND
R1
2.2µF
R2
49.9k
1%
R3
2M
R2
V
V
= 1.24V 1 +
REF
(
)
R1
≥ V
REF
R1 + R2 ≈ 33k
+ 200mV
IN
R1 = (V
–1.24V) (43.5k)
TRIP
LT1303 F06
LT1303 F05
HYSTERESIS ≈ 30mV
Figure 6. Accessing Internal Reference
Figure 5. R3 Adds Hysteresis to Low-Battery Detector
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APPLICATIONS INFORMATION
Figure 7 shows inductor current of a suitable inductor,
di/dt is controlled at all times. The rapid rise in current
shown in Figure 8 results from this inductor saturating at
approximately 1A. Saturation occurs when the inductor
cannotholdanymoremagneticenergyinthecore.Current
thenincreasesrapidly, limitedonlybytheresistanceofthe
winding. Figure9’sinductor hashighDCresistancewhich
results in the exponential time constant shape of the
inductor current.
Inductor Section
Inductors suitable for use with the LT1303 usually fall in
the 5µH to 50µH range. The inductor must: (1) handle
current of 1.25A without saturating, (2) have enough
inductance to provide a di/dt lower than 400mA/µs, and
(3) have low enough DC resistance to avoid excessive
heating or efficiency losses. Higher value inductors will
deliver more power but tend to be physically larger. Most
ferrite core drum or rod inductors such as those specified
inTable1aresuitableforuse. Itisacceptabletobiasopen-
flux inductors (e.g. Sumida CD54) into saturation by 10 to
20% without adverse effects.
IL
Table 1. Recommended Inductors
PHONE
500mA/DIV
VENDOR
SERIES
APPROPRIATE VALUES NUMBERS
Coilcraft
D03316
D01608
10µH to 47µH
10µH
(708) 639-6400
LT1303 F07
5µs/DIV
Coiltronics
OCTAPAK
CTX20-1
CTX20-2
CTX33-4
(407) 241-7876
20µH
20µH
33µH
Figure 7. Properly Chosen Inductor Does Not Saturate
Sumida
Gowanda
CD54
GA10
10µH to 33µH
10µH to 33µH
(708) 956-0666
(716) 532-2234
7
LT1303/LT1303-5
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APPLICATIONS INFORMATION
Capacitor Selection
Input and output capacitors should have low ESR for best
efficiency. Recommended capacitors include AVX TPS
series, Sprague 595D series, and Sanyo OS-CON. The
output capacitor’s ESR determines the high frequency
ripple amplitude. A 100µF capacitor is the minimum rec-
ommendedfora5Voutput. Higheroutputvoltagescanuse
lower capacitance values. For example, a 12V output can
use a 33µF or 47µF capacitor. The VIN pin of the LT1303
should be decoupled with a 47µF or 100µF capacitor at the
pin. When driving a transformer, an additional decoupling
network of 10Ω and 0.1µF ceramic is recommended as
shown in Figure 10.
LT1303 F08
Figure 8. This Inductor Saturates at IL≈1A. A Poor Choice
V
IN
10Ω
LT1303 F09
+
V
IN
SW
47µF
Figure 9. Slight Exponential Shape to Inductor Current
Waveform Indicates Excessive DC Resistance
0.1µF
CERAMIC
LT1303
• • •
GND
PGND
Diode Selection
LT1303 F10
TheLT1303’shighswitchingspeeddemandsahighspeed
rectifier. Schottky diodes are preferred for their low for-
ward drop and fast recovery. Suitable choices include the
1N5817, MBRS120LT3, and MBR0520LT1. Do not use
signal diodes such as 1N4148. They cannot carry 1A
current. Also avoid “general-purpose” diodes such as
1N4001. These are far too slow and are unsuitable for any
switching regulator application. For high temperature
applications a silicon diode such as the MUR105 will have
less leakage.
Figure 10. 10Ω-1µF Network to LT1303 VIN Pin Provides
Additional Decoupling. Recommended When Driving
Transformers.
Table 2. Recommended Capacitors
PHONE
VENDOR
AVX
Sanyo
SERIES
TPS
OS-CON
HFQ
TYPE
NUMBERS
Surface Mount
Through-Hole
Through-Hole
Surface Mount
(803) 448-9411
(619) 661-6835
(201) 348-5200
(603) 224-1961
Panasonic
Sprague
595D
8
LT1303/LT1303-5
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TYPICAL APPLICATIONS
Setting Output Voltage on LT1303
1N5817
L1
V
IN
V
IN
SW
V
OUT
+
R2
R1
LT1303
100µF
+
FB
100µF
GND
R2
PGND
1303 TA03
V
= 1.24V 1 +
OUT
(
)
R1
5V Step-Up Converter with Reference Output
1N5817
22µH*
INPUT
1.8V TO 4.5V
100k
V
SW
IN
OUTPUT
5V
LBO
SENSE
2N3906
+
LT1303-5
100µF
+
V
REF
OUTPUT
1.24V
100µF
LBI
SHDN
PGND
+
GND
2.2µF
33k
1303 TA04
* SUMIDA CD54-220MC
9
LT1303/LT1303-5
TYPICAL APPLICATIONS
U
4-, 5-Cell to 5V Converter with Output Disconnect
510Ω
MBRS130T3
10µH*
V
IN
2V TO 8V
ZTX788B
V
SW
IN
V
OUT
5V
SENSE
100mA
+
LT1303-5
33µF
SHDN
PGND
+
+
33µF
220µF**
GND
SHUTDOWN
*SUMIDA CD54-100MC
**AVX TPS 220µF/10V
LT1303TA05
3-Cell to 3.3V Boost/Linear Converter with Output Disconnect
MBRS130T3
10µH*
Si9433
V
IN
2V TO 6V
100k
V
SW
LB0
100Ω
IN
SHUTDOWN
SHDN
LT1303
+
+
200k†
33µF
33µF
V
OUT
3.3V/200mA
LBI
FB
PGND
†
GND
1.96k
+
330µF**
× 2
†
121k
*SUMIDA CD54-100MC
**AVX TPS 330µF/6.3V
†1% METAL FILM
LT1303 TA07
10
LT1303/LT1303-5
U
TYPICAL APPLICATIONS
EL Panel Driver
T1**
1:15
MUR160
V
IN
1.5V TO 8V
6
•
4,5
C1*
50pF
10
•
10Ω
1,2
1N5818
4.7µF
160V
+
3.3M
3.3M
+
V
SW
IN
47µF
1k
1/2W
EL PANEL
0.1µF
CERAMIC
3.3M
1N4148
LT1303
10k
FB
PGND
SHDN
GND
MPSA42
51k
SHUTDOWN
R1†
25k
100Hz TO 1000Hz
SQUARE WAVE
DRIVE
*ADD C1 FOR OPEN-PANEL PROTECTION
**DALE LPE5047-A132 1:15 TURNS RATIO (605) 666-9301
†R1 ADJUSTS V
83V
TO 115V
LT1303 TA06
OUT
RMS RMS
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 circuits as described herein will not infringe on existing patent rights.
11
LT1303/LT1303-5
U
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead Plastic DIP
0.400*
(10.160)
MAX
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
8
1
7
6
5
4
0.065
(1.651)
TYP
0.255 ± 0.015*
(6.477 ± 0.381)
0.009 – 0.015
(0.229 – 0.381)
0.125
0.005
0.015
(0.380)
MIN
(3.175)
MIN
(0.127)
MIN
+0.025
–0.015
2
3
0.325
N8 0695
+0.635
8.255
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
*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 SOIC
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 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
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
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
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
3
4
2
SO8 0695
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
700mA Output Current in SO-8 Package
LT1129
Micropower Low Dropout Regulator
LCD and CCFL Backlight Controller
LT1182/83/84
LT1301
High Efficiency and Excellent Backlight Control Range
120µA Quiescent Current
5V to 12V/200mA Step-Up DC/DC Converter
2-Cell to 5V/600mA Step-Up DC/DC Converter
Micropower 2A Switch DC/DC Converter with Low-Battery Detect
500kHz Step-Up PWM, 1.5A Switch
PCMCIA Host Switch with Protection
LT1302
200µA Quiescent Current
LT1305
2V to 5V at 400mA
LT1372
LTC®1472
Low Noise, Fixed Frequency Operation
Includes Current Limit and Thermal Shutdown
LT/GP 0195 10K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
12
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LINEAR TECHNOLOGY CORPORATION 1995
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