LINER LT1301IS8 Micropower high efficiency 5v/12v step-up dc/dc converter for flash memory Datasheet

LT1301
Micropower High Efficiency
5V/12V Step-Up DC/DC
Converter for Flash Memory
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DESCRIPTION
FEATURES
12V at 120mA from 5V or 3.3V Supply
Supply Voltage as Low as 1.8V
Better High Current Efficiency Than CMOS
Up to 89% Efficiency
120µA Quiescent Current
Shutdown to 10µA
Programmable 5V or 12V Output
Low VCESAT Switch: 170mV at 1A Typical
ILIM Pin Programs Peak Switch Current
Uses Inexpensive Surface Mount Inductors
8-Lead DIP or SOIC Package
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■
■
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The LT1301 is a micropower step-up DC/DC converter that
utilizes Burst Mode™ operation. The device can deliver 5V
or 12V from a two-cell battery input. It features programmable 5V or 12V output via a logic-controlled input, noload quiescent current of 120µA and a shutdown pin which
reduces supply current to 10µA. The on-chip power switch
has a low 170mV saturation voltage at a switch current of
1A, a four-fold reduction over prior designs. A 155kHz
internal oscillator allows the use of extremely small surface mount inductors and capacitors. Operation is guaranteed at 1.8V input. This allows more energy to be extracted
from the battery, increasing operating life. The ILIM pin can
be used for soft start or to program peak switch current
with a single resistor allowing the use of even smaller
inductors in lighter load applications. The LT1301 is
available in an 8-lead SOIC package, minimizing board
space requirements. For a selectable 3.3V/5V step-up
converter, please see the LT1300. For higher output
power, see the LT1302.
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APPLICATIONS
Flash Memory VPP Generator
Palmtop Computers
Portable Instruments
Bar-Code Scanners
Personal Digital Assistants
PCMCIA Cards
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Burst Mode is a trademark of Linear Technology Corporation.
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TYPICAL APPLICATIONS N
L1
33µH
D1
SELECT
90
SENSE
88
VIN = 5V
86
VIN = 3.3V
84
LT1301
47µF
Efficiency
12V
VOUT
2V/DIV
SW
VIN
+ C1
Output Voltage
12V
OUTPUT
EFFICIENCY (%)
5V
OR
3.3V
+ C2
SHUTDOWN SHDN
ILIM
PGND
GND
N/C
33µF
20V
0.1µF*
SHUTDOWN
10V/DIV
LT1301 F1
L1 = COILCRAFT DO3316-333
OR SUMIDA CD73-330KC
D1 = 1N5817 OR MOTOROLA
MBRS130LT3
C1 = AVX TPSD476M016R0100
OR SANYO OS-CON 165A47M
C2 = AVX TPSD336M020R0100
OR SANYO OS-CON 205A33M
Figure 1. 3.3V/5V to 12V Step-Up Converter
80
78
76
1ms/DIV
*REQUIRED FOR 5V OUTPUT
82
VIN = 5V, VOUT = 12V
LOAD = 100Ω
LT1301 TAO1
74
72
0
1
10
100
LOAD CURRENT (mA)
300
LT1301 TA2
LT1300 F2
1
LT1301
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SYMBOL PARAMETER
IQ
Quiescent Current
VIN
ORDER PART
NUMBER
TOP VIEW
GND 1
8
PGND
SEL 2
7
SW
SHDN 3
6
VIN
SENSE 4
5
ILIM
N8 PACKAGE
8-LEAD PLASTIC DIP
VSHDNH
VSHDNL
VSELH
VSELL
ISHDN
Output Referred
Comparator Hysteresis
Oscillator Frequency
Oscillator TC
Maximum Duty Cycle
Switch On-Time
Output Line Regulation
Switch Saturation Voltage
Switch Leakage Current
Peak Switch Current
(Internal Trip Point)
Shutdown Pin High
Shutdown Pin Low
Select Pin High
Select Pin Low
Shutdown Pin Bias Current
ISEL
Select Pin Bias Current
DC
tON
VCESAT
1301
1301I
TA = 25°C, VIN = 2V unless otherwise noted.
CONDITIONS
VSHDN = 0.5V, VSEL = 5V, VSENSE = 5.5V
VSHDN = 1.8V
VSEL = 5V
VSEL = 0V
VSEL = 5V (Note 1)
VSEL = 0V (Note 1)
Current Limit not Asserted.
MIN
●
●
●
●
1.8
2.0
11.52
4.75
●
●
120
75
Current Limit not Asserted.
1.8V < VIN < 6V
ISW = 700mA
VSW = 5V, Switch Off
ILIM Floating (See Typical Application)
ILIM Grounded
●
●
●
0.75
●
1.8
●
1.5
TYP
120
7
MAX
200
15
12.00
5.00
50
22
155
0.2
86
5.6
0.06
130
0.1
1.0
0.4
12.48
5.25
100
50
185
95
0.15
200
10
1.25
0.5
●
VSHDN = 5V
VSHDN = 2V
VSHDN = 0V
0V < VSEL < 5V
The ● denotes specifications which apply over the 0°C to 70°C
temperature range.
2
S8 PART MARKING
TJMAX = 100°C, θJA = 150°C/ W
Input Voltage Range
Output Sense Voltage
LT1301CN8
LT1301CS8
LT1301IS8
S8 PACKAGE
8-LEAD PLASTIC SOIC
●
VOUT
W
PACKAGE/ORDER INFORMATION
VIN Voltage .............................................................. 10V
SW1 Voltage ............................................................ 20V
Sense Voltage .......................................................... 20V
Shutdown Voltage ................................................... 10V
Select Voltage .......................................................... 10V
ILIM Voltage ............................................................ 0.5V
Maximum Power Dissipation ............................. 500mW
Operating Temperature Range
LT1301C ................................................... 0°C to 70°C
LT1301I .................................................. 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ELECTRICAL CHARACTERISTICS
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ABSOLUTE MAXIMUM RATINGS
●
●
●
●
8
3
0.1
1
0.8
20
1
3
Note 1: Hysteresis specified is DC. Output ripple may be higher if
output capacitance is insufficient or capacitor ESR is excessive.
See operation section.
UNITS
µA
µA
V
V
V
V
mV
mV
kHz
%/ °C
%
µs
%/V
mV
µA
A
A
V
V
V
V
µA
µA
µA
µA
LT1301
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TYPICAL PERFORMANCE CHARACTERISTICS
Total Quiescent Current
in Shutdown
5V Output Efficiency
90
80
TA = 25°C
VIN = 3.3V
84
ISHDN + IVIN + ISENSE (µA)
86
VIN = 2.5V
82
80
78
76
74
60
50
40
30
20
72
10
70
0
1
10
100
LOAD CURRENT (mA)
1000
8
6
4
0
0
1
2
4
5
6
3
INPUT VOLTAGE (V)
7
8
0
1
6
4
3
2
5
SHUTDOWN VOLTAGE (V)
7
8
LT1300 G3
Load Transient Response of
Figure 1 Circuit
No-Load Input Current
250
500
TA = 25°C
450
200
INPUT CURRENT (µA)
SATURATION VOLTAGE (mV)
12
10
LT1301 G2
Saturation Voltage vs Switch Current
175
150
125
100
75
VOUT
100mV/DIV
AC COUPLED
400
350
VOUT = 12V
ILOAD
300
200µs/DIV
100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
SWITCH CURRENT (A)
1
VOUT = 5V
2
3
4
5
INPUT VOLTAGE (V)
Load Transient Response of
Figure 1 Circuit
200µs/DIV
7
Select Pin Transient Response
ILOAD 120mA
0mA
VIN = 3.3V
6
LT1301 G5
LT1301 G4
VOUT
100mV/DIV
AC COUPLED
LT1301 G7
LT1301 G6
VIN = 5V
200
150
25
120mA
0mA
250
50
0
16
14
2
LT1301 G1
225
TA = 25°C
18
70
SHUTDOWN CURRENT (µA)
88
EFFICIENCY (%)
Shutdown Pin Bias Current
20
Select Pin Transient Response
12V
12V
VOUT
2V/DIV
VOUT
2V/DIV
5V
5V
VSELECT
10V/DIV
VSELECT
10V/DIV
5ms/DIV
COUT = 100µF, VIN = 5V
100Ω LOAD
5ms/DIV
LT1301 G9
LT1301 G8
COUT = 100µF, VIN = 3.3V
100Ω LOAD
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LT1301
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PIN FUNCTIONS
GND (Pin 1): Signal Ground. Tie to PGND under the
package.
for approximately 400mA. A resistor between ILIM and
ground sets peak current to some intermediate value .
Sel (Pin 2): Output Select. When tied to VIN converter
regulates at 12V. When grounded or floating converter
regulates at 5V. May be driven under logic control.
VIN (Pin 6): Supply Pin. Must be bypassed with a large
value electrolytic to ground. Keep bypass within 0.2" of the
device.
SHDN (Pin 3): Shutdown. Pull high to shut down the
LT1301. Ground for normal operation.
SW (Pin 7): Switch Pin. Connect inductor and diode here.
Keep layout short and direct to minimize radio frequency
interference.
Sense (Pin 4): “Output” Pin. Goes to internal resistive
divider. If operating at 5V output, a 0.1µF ceramic capacitor is required from Sense to Ground.
PGND (Pin 8): Power Ground. Tie to signal ground (pin 1)
under the package. Bypass capacitor from VIN should be
tied directly to PGND within 0.2" of the device.
ILIM (Pin 5): Float for 1A switch current limit. Tie to ground
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BLOCK DIAGRAM
VIN
D1
L1
VOUT
+
+
C2
C1
SW
VIN
SENSE
4
2
7
18mV
A2 CURRENT
COMPARATOR
R1
3Ω
+
R2
730Ω
500k
–
A1
COMPARATOR
OFF
+
1.25V
REFERENCE
ENABLE OSCILLATOR
155kHZ
97.5k
A3 DRIVER
Q2
1×
–
Q3
BIAS
69.2k
Q1
160×
8.5k
GND
1
SELECT
2
SHUTDOWN
3
5
ILIM
PGND
8
LT1301 F2
Figure 2.
4
LT1301
TEST CIRCUITS
5V
2V
100Ω
VIN
IL
SEL
100µF
SW
fOUT
LT1301
SENSE
SHDN
GND
PGND
Oscillator Test Circuit
LT1301 TC
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OPERATION
Operation of the LT1301 is best understood by referring to
the Block Diagram in Figure 2. When A1’s negative input,
related to the Sense pin voltage by the appropriate resistor-divider ratio is higher that the 1.25V reference voltage,
A1’s output is low. A2, A3 and the oscillator are turned off,
drawing no current. Only the reference and A1 consume
current, typically 120µA. When A1’s negative input drops
below 1.25V, overcoming A1’s 6mV hysteresis, A1’s output goes high enabling the oscillator, current comparator
A2, and driver A3. Quiescent current increases to 2mA as
the device prepares for high current switching. Q1 then
turns on in controlled saturation for (nominally) 5.3µs or
until comparator A2 trips, whichever comes first. After a
fixed off-time of (nominally) 1.2µs, Q1 turns on again. The
LT1301’s switching causes current to alternately build up
in L1 and dump into output capacitor C2 via D1, increasing
the output voltage. When the output is high enough to
cause A1’s output to go to low, switching action ceases.
C2 is left to supply current to the load until VOUT decreases
enough to force A1’s output high, and the entire cycle
repeats. Figure 4 details relevant waveforms. A1’s cycling
causes low-to-mid-frequency ripple voltage on the output.
Ripple can be reduced by making the output capacitor
large. The 33µF unit specified results in ripple of 100mV to
200mV on the 12V output. A 100µF capacitor will decrease
ripple to 50mV. If operating at 5V ouput a 0.1µF ceramic
capacitor is required at the Sense pin in addition to the
electrolytic.
If switch current reaches 1A, causing A2 to trip, switch ontime is reduced and off-time increases slightly. This allows
continuous mode operation during bursts. A2 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, A2’s output goes high, truncating the ontime portion of the oscillator cycle and increasing off-time
to about 2µs as shown in Figure 3, trace A. This programmed peak current can be reduced by tying the ILIM pin
to ground, causing 15µA to flow through R2 into Q3’s
collector. Q3’s current causes a 10.4mV drop in R2 so that
only an additional 7.6mV is required across R1 to turn off
the switch. This corresponds to a 400mA switch current
as shown in Figure 3, trace B. The reduced peak switch
current reduces I2R loses in Q1, L1, C1 and D1. Efficiency
can be increased by doing this provided that the accompanying reduction in full load current is acceptable. Lower
peak currents also extend alkaline battery life due to the
alkaline cell’s high internal impedance.
TRACE A
500mA/DIV
ILIM PIN
OPEN
TRACE B
500mA/DIV
ILIM PIN
GROUNDED
20µs/DIV
Figure 3. Switch Pin Current With ILIM Floating or Grounded
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LT1301
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APPLICATIONS INFORMATION
VOUT
100mV/DIV
AC COUPLED
VOUT
5V/DIV
VSW
10V/DIV
IIN
500mA/DIV
IL
500mA/DIV
VSHDN
10V/DIV
20µs/DIV
200µs/DIV
LT1300 F4
Figure 5. Start-Up Response
Figure 4. Burst Mode Operation in Action
Output Voltage Selection
The LT1301 can be selected to 5V or 12V under logic
control or fixed at either by tying Select to ground or VIN
respectively. It is permissible to tie Select to a voltage
higher than VIN as long as it does not exceed 10V.
Efficiency in 5V mode will be slightly less that in 12V mode
due to the fact that the diode drop is a greater percentage
of 5V than 12V. Since the bipolar switch in the LT1301 gets
its base drive from VIN, no reduction in switch efficiency
occurs when in 5V mode. When VIN exceeds the programmed output voltage the output will follow the input.
This is characteristic of the simple step-up or “boost”
converter topology. A circuit example that provides a
regulated output with an input voltage above or below the
output (known as a buck-boost or SEPIC) is shown in the
Typical Applications section.
Shutdown
The converter can be turned off by pulling SHDN (pin 3)
high. Quiescent current drops to 10µA in this condition.
Bias current of 8µA to 10µA flows into the pin (at 5V input).
It is recommended that SHDN not be left floating. Tie the
pin to ground if the feature is not used. SHDN can be driven
high even if VIN is floating.
ILIM Function
The LT1301’s current limit (ILIM) pin can be used for soft
start. Upon start-up, the LT1301 will draw maximum
current from the supply (about 1A) from the supply to
charge the output capacitor. Figure 5 shows VOUT and IIN
waveforms as the device is turned on. The high current
flow can create IR drops along supply and ground lines
or cause the input supply to drop out momentarily. By
6
LT1300 F5
VIN = 5V, VOUT = 12V
VIN = 5V, VOUT = 12V, L = 33µH
COUT = 33µF, ILOAD = 90mA
D1
1N5817
L1
33µH
VIN
3.3V OR 5V
SW
VIN
SELECT
+
47µF
SHUTDOWN
12V
SENSE
LT1301
+ C2
33µF
SHDN
ILIM
PGND
GND
R1
1M
C3
0.1µF
LT1301 F6
Figure 6.
VOUT
5VDIV
IIN
500mA/DIV
VSHDN
10V/DIV
200µs/DIV
LT1300 F5
VIN = 5V, VOUT = 12V
Figure 7. Startup Response Soft-Start Circuitry Added
adding R1 and C3 as shown in Figure 6, the switch
current in the LT1301 is initially limited to 400mA until
the 15µA flowing out of the ILIM pin charges up C3. Input
current is held to under 500mA while the output voltage
ramps up to 12V as shown in Figure 7. R1 provides a
discharge path for the capacitor without appreciably decreasing peak switch current. When using the ILIM pin softstart mode a minimum load of a few hundred microamperes is recommended to prevent C3 from discharging, as
no current flows out of ILIM when the LT1301 is not
LT1301
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APPLICATIONS INFORMATION
Table 1. Recommended Inductors
VENDOR
Coilcraft
5
ILIM PIN
Open
Open
Open
Ground
10k
Ground
Open
Open
Open
Open
Open
Ground
Ground
Open
Open
Open
Ground
Open
Ground
switching. Zero load current causes the LT1301 to switch
so infrequently that C3 can completely discharge reducing
subsequent peak switch current to 400mA. If a load is
suddenly applied, output voltage will sag until C3 can be
recharged and peak switch current returns to 1A.
If the full capacity of the LT1301 is not required peak
current can be reduced by changing the value of R3 as
shown in Figure 8. With R3 = 0 switch current is limited to
approximately 400mA. Smaller, less expensive inductors
with lower saturation ratings can then be used.
Inductor Selection
For full output power, the inductor should have a saturation current rating of 1.25A for worst-case current limit,
although it is acceptable to bias an inductor 20% or more
into saturation. Smaller inductors can be used in conjunction with the ILIM pin. Efficiency is significantly affected by
inductor DCR. For best efficiency limit the DCR to 0.03Ω
or less. Toroidal types are preferred in some cases due to
their inherent flux containment and EMI/RFI superiority.
Recommended inductors are listed in Table 1.
EFFICIENCY (%)
30mA
60mA 120mA
84
84
85
89
89
90
82
82
—
85
—
—
86
87
—
88
—
—
78
—
—
84
84
—
88
88
89
86
86
87
89
89
90
81
—
—
85
—
—
84
85
86
88
88
89
80
80
81
85
—
—
84
84
85
83
—
—
COMPONENT
HEIGHT (mm)
5.5
PHONE NUMBER
(708) 639–6400
3.5
3.5
4.2
(407) 241-7876
Through-Hole
(716) 532-2234
2.0
(404) 436-1300
3.5
(708) 956-0666
3.0
Table 2. Recommended Capacitors
VENDOR
AVX
Sanyo
Panasonic
SERIES
TPS
OS-CON
HFQ
1100
TYPE
Surface Mount
Through-Hole
Through-Hole
PHONE#
(803)448–9411
(619) 661–6835
(201) 348-5200
1.6V ≤ VIN ≤ 5V
1000
SWITCH CURRENT (mA)
L (µH) DCR (Ω) VIN(V)
33
0.088
3.3
5
DO1608-223
Coilcraft
22
.31
3.3
3.3
5
5
DO1608-103
Coilcraft
10
.11
2
CTX20-1
Coiltronics
20
.175
3.3
5
GA10-332
Gowanda
33
.077
3.3
5
LQH3G220K04M00 Murata-Erie
22
0.7
3.3
5
CD73-330KC
Sumida
33
0.131
3.3
5
CDRH62-330MC
Sumida
33
0.48
3.3
PART NUMBER
DO3316-333
900
800
700
600
500
400
300
100
1k
10k
100k
CURRENT LIMIT SET RESISTOR (Ω)
1M
LT1301 F8
Figure 8. Peak Switch Current vs. Current Limit Set Resistor
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LT1301
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APPLICATIONS INFORMATION
Capacitor Selection
Diode Selection
Low ESR capacitors are required for both input and output
of the LT1301. ESR directly affects ripple voltage and
efficiency. For surface mount applications AVX TPS series
tantalum capacitors are recommended. These have been
specially designed for SMPS and have low ESR along with
high surge current ratings. For through-hole applications
Sanyo OS-CON capacitors offer extremely low ESR in a
small size. Again, if peak switch current is reduced using
the ILIM pin, capacitor requirements can be relaxed and
smaller, higher ESR units can be used. Suggested capacitor sources are listed in Table 2.
Best performance is obtained with a Schottky rectifier
diode such as the 1N5817. Phillips Components makes
this in surface mount as the PRLL5817. Motorola makes
the MBRS130LT3 which is slightly better and also in
surface mount. For lower output power a 1N4148 can be
used although efficiency will suffer substantially.
Layout Considerations
The LT1301 is a high speed, high current device. The input
capacitor must be no more than 0.2˝ from VIN (pin 6) and
ground. Connect the PGND and GND (pins 8 and 1)
together under the package. Place the inductor adjacent to
SW (pin 7) and make the switch pin trace as short as
possible. This keeps radiated noise to a minimum.
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TYPICAL APPLICATIONS N
Four-Cell to 5V Converter
C2
100µF
L1
33µH
4 CELLS
+ C1
ILIM
SENSE
LT1301
100µF
5V OUTPUT
200mA
80 to 83% EFFICIENT
AT ILOAD > 10mA
SW
VIN
NC
1N5817
+
SHDN
0.1µF
+ C3
L2
33µH
SELECT
100µF
PGND
GND
SHUTDOWN
LT1301 TAO3
Step-Up Converter with Automatic Output Disconnect
470Ω
L1*
10µH
1N5817
2N4403
5V, 200mA
NC
2×
AA
CELL
+
SHUTDOWN
SELECT
VIN
SHDN
SW
100µF
ILIM
GND
8
100µF
LT1301
NC
*SUMIDA CD54-100LC
COILCRAFT DO3316-223
+
SENSE
PGND
0.1µF
LT1301 TA4
LT1301
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TYPICAL APPLICATIONS N
LCD Contrast Supply
VIN
1.8V TO 6V
CONTRAST
VOUT –4V TO –29V 12mA
MAXIMUM FROM 1.8V SUPPLY
(77% EFFICIENT)
20mA MAXIMUM FROM
3V SUPPLY (83% EFFICIENT)
T1
4
7
3
1
22µF
150K
8
2
10
9
NC
+
+ 35V
VIN
SW
SENSE
SHDN
1N5819
SHUTDOWN
LT1301
100µF
NC
ILIM
SELECT
PGND
GND
12K
T1 = DALE LPE-5047-AO45 (605) 665-9301
12K
+
2.2µF
PWM IN
0% TO 100%
CMOS DRIVE 0V TO 5V
LT1300 TA5
Low-Voltage CCFL Power Supply
9
7
22pF
3kV
TI
1
VIN
2V - 6V
5
4
1Ω
3
2
0.068µF
120Ω
1N5817
CCFL
ZTX849
NC
L1
47µH
SELECT
VIN
SW
SENSE
+
LT1301
0.1µF
SHDN
GND
10µF
2N3904
ILIM
PGND
+
1µF
SHUTDOWN
T1 = COILTRONICS CTX110654-1
L1 = COILCRAFT D03316-473
WIMA
MKP20
ZTX849
7.5K
1%
0 - 5VDC IN
INTENSITY ADJUST
100µA TO 2mA BULB CURRENT
1N4148
LT1300 TA6
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LT1301
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TYPICAL APPLICATIONS N
5V to – 5V Converter
L1
33µH
5V
1N965
2
3
1
4
–VOUT 5V
300mA
1N5817
+
33µF
1N4148
+
33µF
SW
VIN
NC
0.1µF
NC
SHDN
SELECT
SENSE
GND
LT1301
OR
LT1300
SHUTDOWN
4.99K
1%
ILIM
PGND
4.99K
1%
L1 = COILTRONICS CTX33-4
10
5V
LT1301 TA7
LT1301
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PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead Plastic DIP
0.300 – 0.320
(7.620 – 8.128)
0.045 – 0.065
(1.143 – 1.651)
8
7
6
5
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
(
0.400
(10.160)
MAX
0.130 ± 0.005
(3.302 ± 0.127)
+0.025
0.325 –0.015
+0.635
8.255
–0.381
0.250 ± 0.010
(6.350 ± 0.254)
0.045 ± 0.015
(1.143 ± 0.381)
)
0.100 ± 0.010
(2.540 ± 0.254)
0.125
(3.175)
MIN
0.020
(0.508)
MIN
1
2
4
3
0.018 ± 0.003
(0.457 ± 0.076)
N8 0392
S8 Package
8-Lead Plastic S0IC
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
8
0.053 – 0.069
(1.346 – 1.752)
0.014 – 0.019
(0.355 – 0.483)
6
5
0.004 – 0.010
(0.101 – 0.254)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
7
0.050
(1.270)
BSC
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
0.150 – 0.
(3.810 – 3.
0.228 – 0.244
(5.791 – 6.197)
1
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.
2
3
4
SO8 0294
11
LT1301
U.S. Area Sales Offices
NORTHEAST REGION
Linear Technology Corporation
One Oxford Valley
2300 E. Lincoln Hwy.,Suite 306
Langhorne, PA 19047
Phone: (215) 757-8578
FAX: (215) 757-5631
SOUTHEAST REGION
Linear Technology Corporation
17060 Dallas Parkway
Suite 208
Dallas, TX 75248
Phone: (214) 733-3071
FAX: (214) 380-5138
SOUTHWEST REGION
Linear Technology Corporation
22141 Ventura Blvd.
Suite 206
Woodland Hills, CA 91364
Phone: (818) 703-0835
FAX: (818) 703-0517
Linear Technology Corporation
266 Lowell St., Suite B-8
Wilmington, MA 01887
Phone: (508) 658-3881
FAX: (508) 658-2701
CENTRAL REGION
Linear Technology Corporation
Chesapeake Square
229 Mitchell Court, Suite A-25
Addison, IL 60101
Phone: (708) 620-6910
FAX: (708) 620-6977
NORTHWEST REGION
Linear Technology Corporation
782 Sycamore Dr.
Milpitas, CA 95035
Phone: (408) 428-2050
FAX: (408) 432-6331
International Sales Offices
FRANCE
Linear Technology S.A.R.L.
Immeuble "Le Quartz"
58 Chemin de la Justice
92290 Chatenay Malabry
France
Phone: 33-1-41079555
FAX: 33-1-46314613
KOREA
Linear Technology Korea Branch
Namsong Building, #505
Itaewon-Dong 260-199
Yongsan-Ku, Seoul
Korea
Phone: 82-2-792-1617
FAX: 82-2-792-1619
TAIWAN
Linear Technology Corporation
Rm. 801, No. 46, Sec. 2
Chung Shan N. Rd.
Taipei, Taiwan, R.O.C.
Phone: 886-2-521-7575
FAX: 886-2-562-2285
GERMANY
Linear Techonolgy GmbH
Untere Hauptstr. 9
D-85386 Eching
Germany
Phone: 49-89-3197410
FAX: 49-89-3194821
SINGAPORE
Linear Technology Pte. Ltd.
101 Boon Keng Road
#02-15 Kallang Ind. Estates
Singapore 1233
Phone: 65-293-5322
FAX: 65-292-0398
UNITED KINGDOM
Linear Technology (UK) Ltd.
The Coliseum, Riverside Way
Camberley, Surrey GU15 3YL
United Kingdom
Phone: 44-276-677676
FAX: 44-276-64851
JAPAN
Linear Technology KK
5F YZ Bldg.
4-4-12 Iidabashi, Chiyoda-Ku
Tokyo, 102 Japan
Phone: 81-3-3237-7891
FAX: 81-3-3237-8010
World Headquarters
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA 95035-7487
Phone: (408) 432-1900
FAX: (408) 434-0507
08/16/93
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977
LT/GP 0394 10K • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1994
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