LT1300CS8#TR [Linear]
LT1300 - Micropower High Efficiency 3.3/5V Step-Up DC/DC Converter; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;
| 型号： | LT1300CS8#TR |
| 厂家： | 
Linear |
| 描述： | LT1300 - Micropower High Efficiency 3.3/5V Step-Up DC/DC Converter; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 转换器 稳压器 开关式稳压器或控制器 电源电路 开关式控制器 光电二极管 |
| 文件： | 总8页 (文件大小：244K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1300
Micropower High Efficiency
3.3/5V Step-Up DC/DC Converter
U
DESCRIPTION
FEATURES
■
Up to 220mA Output Current at 5V from 2V Supply
Supply Voltage as Low as 1.8V
Up to 88% Efficiency
TheLT1300isamicropowerstep-upDC/DCconverterthat
utilizes Burst Mode™ operation. The device can deliver 5V
or 3.3V from a two-cell battery input. It features program-
mable 5V or 3.3V output via a logic-controlled input, no-
loadquiescentcurrentof120µAandashutdownpinwhich
reducessupplycurrentto10µA.Theon-chippowerswitch
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 sur-
facemountinductorsandcapacitors.Operationisguaran-
teedat1.8Vinput. Thisallowsmoreenergytobeextracted
from the battery increasing operating life. The ILIM pin can
be used to program peak switch current with a single
resistor allowing the use of less expensive and smaller
inductors and capacitors in lighter load applications. The
LT1300isavailableinan8-leadSOICpackage, minimizing
board space requirements. For a 5V/12V Selectable Out-
put Converter see the LT1301. For increased output cur-
rent see the LT1302.
■
■
■
■
■
■
■
■
■
■
Small Inductor –10µH
120µA Quiescent Current
Shutdown to 10µA
Programmable 3.3V or 5V Output
ILIM Pin Programs Peak Switch Current
Low VCESAT Switch: 170mV at 1A Typical
Uses Inexpensive Surface Mount Inductors
8-Lead DIP or SOIC Package
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APPLICATIONS
■
Palmtop Computers
Portable Instruments
Bar-Code Scanners
■
■
■
DC/DC Converter Module Replacements
■
Battery Backup Supplies
■
Personal Digital Assistants
■
Burst Mode is a trademark of Linear Technology Corporation.
PCMCIA Cards
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TYPICAL APPLICATIONS N
Two-Cell to 3.3V/5V Step-Up Converter
5V Output Efficiency
L1
10µH
D1
5V/3.3V
OUTPUT
90
88
6
7
SW
V
IN
V
= 4.0V
IN
4
5
2
3
5V/3.3V
SELECT
C1
100µF
SELECT
SENSE
86
84
82
80
78
76
74
2×
AA
CELL
+
V
V
= 3.0V
= 2.5V
IN
IN
LT1300
+
C1
100µF
SHDN
N/C
SHUTDOWN
I
LIM
V
= 2.0V
PGND
8
GND
1
IN
LT1300 TA1
L1 = COILCRAFT DO1608-103
OR SUMIDA CD54-100
1
10
100
500
C1 = AVX TPSD107M010R0100
OR SANYO OS-CON 16SA100M
LOAD CURRENT (mA)
LT1300 TA2
D1 =MBRS130LT3
OR 1N5817
1
LT1300
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ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
VIN Voltage .............................................................. 10V
SW1 Voltage ............................................................ 20V
Sense Voltage .......................................................... 10V
SHUTDOWN Voltage................................................ 10V
SELECT Voltage ....................................................... 10V
ORDER PART
TOP VIEW
NUMBER
GND
SEL
1
2
3
4
PGND
SW
8
7
6
5
LT1300CN8
LT1300CS8
SHDN
SENSE
V
IN
I
LIM
I
LIM Voltage ............................................................ 0.5V
N8 PACKAGE
S8 PACKAGE
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
8-LEAD PLASTIC DIP
S8 PART MARKING
1300
8-LEAD PLASTIC SOIC
TJMAX = 100°C, θJA = 150°C/ W
Consult factory for Industrial grade parts.
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 2V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Quiescent Current
V
V
= 0.5V, V = 5V, V = 5.5V
SENSE
= 1.8V
●
●
120
7
200
15
µA
µA
Q
SHDN
SHDN
SEL
V
V
Input Voltage Range
Output Sense Voltage
1.8
2.0
4.80
3.15
V
V
V
V
IN
●
V
V
= 5V
= 0V
●
●
5.0
3.3
5.20
3.45
OUT
SEL
SEL
Output Referred
Comparator Hysteresis
V
V
= 5V (Note 1)
= 0V (Note 1)
●
●
22
14
50
35
mV
mV
SEL
SEL
Oscillator Frequency
Oscillator TC
Maximum Duty Cycle
Switch On Time
Current Limit not Asserted. See Test Circuit.
120
75
155
0.2
86
185
kHz
%/°C
%
DC
95
t
Current Limit not Asserted.
5.6
µs
ON
Output Line Regulation
Switch Saturation Voltage
Switch Leakage Current
1.8V < V < 6V
●
●
●
0.06
130
0.1
0.15
200
10
%/V
mV
µA
IN
V
I
= 700mA
SW
CESAT
V
= 5V, Switch Off
SW
Peak Switch Current
(Internal Trip Point)
Shutdown Pin High
Shutdown Pin Low
Select Pin High
I
I
Floating (See Typical Application)
Grounded
0.75
1.8
1.0
0.4
1.25
A
A
V
V
V
V
µA
µA
µA
LIM
LIM
V
V
V
V
●
SHDNH
SHDNL
SELH
0.5
●
●
1.5
Select Pin Low
Shutdown Pin Bias Current
0.8
20
SELL
I
V
V
V
= 5V
= 2V
= 0V
●
●
●
9
3
0.1
SHDN
SHDN
SHDN
SHDN
1
3
I
Select Pin Bias Current
0V < V
< 5V
●
1
µA
SEL
SEL
The
●
denotes specifications which apply over the 0°C to 70°C
Note 1: Hysteresis specified is DC. Output ripple may be higher if
output capacitance is insufficient or capacitor ESR is excessive. See
applications section.
temperature range.
2
LT1300
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TYPICAL PERFORMANCE CHARACTERISTICS
Total Quiescent Current
in Shutdown
Efficiency
No-Load Battery Current
88
86
170
165
80
70
60
50
40
30
20
10
0
V
= 3.3V
OUT
L = 10µH
V
= 5V
OUT
84
82
80
78
76
74
72
70
68
66
160
155
V
= 3V
IN
V
= 2.5V
IN
150
145
V
= 2V
IN
V
= 3.3V
OUT
140
135
130
125
120
1
10
100
1000
4
5
1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4
0
1
2
3
6
7
8
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
LT1300 G1
LT1300 G2
LT1300 G3
Maximum Output Current
vs Input Voltage
Shutdown Pin Bias Current
VCESAT vs ISW
20
18
16
14
12
10
8
700
600
250
V
LIM
= 5V,
OUT
T
= 25°C
A
225
I
FLOATING
200
175
L = 22µH
500
COILCRAFT
DO3316-223
150
125
L = 10µH
400
300
200
COILCRAFT
DO1608-103
100
75
6
4
50
25
0
100
0
2
0
0
4
6
7
2
3.5
4.5
1
2
3
5
8
1.5
2.5
3
4
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
SWITCH CURRENT (A)
1
SHUTDOWN VOLTAGE (V)
INPUT VOLTAGE (V)
LT1300 G4
LT1300 G6
LT1300 G5
Maximum Output Current
vs Input Voltage
Transient Response
VIN = 2V, VOUT = 5V
Startup Response
900
800
700
600
500
400
300
200
100
V
I
= 3.3V
OUT
FLOATING
VOUT
100mV/DIV
LIM
VOUT
1V/DIV
AC COUPLED
L = 10µH
200mA
ILOAD
VSHDN
10V/DIV
0
500µs/DIV
200µs/DIV
LT1300 G9
LT1300 G8
VOUT = 5V
RLOAD = 20Ω
0
1.5
3
3.5
2
2.5
INPUT VOLTAGE (V)
LT1300 G7
3
LT1300
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PIN FUNCTIONS
GND (Pin 1): Signal Ground.
VIN (Pin 6): Supply Pin. Must be bypassed with a large
value electrolytic to ground. A 0.1µF ceramic capacitor
close to the pin may be needed in some cases.
Sel (Pin 2): Output Select. When tied to VIN or VOUT
converter regulates at 5V. When grounded converter
regulates at 3.3V.
SW (Pin 7): Switch Pin. Connect inductor and diode here.
Keep layout short and direct to minimize electronic radia-
tion.
SHDN(Pin3):Shutdown. Pullhightoeffectshutdown.Tie
to ground for normal operation.
PGND (Pin 8): Power Ground. Tie to signal ground (pin 1)
under the package. Bypass capacitor from VIN should be
tied directly to the pin.
Sense (Pin 4): “Output” Pin.
ILIM (Pin5):Floatfor1Aswitchcurrentlimit. Tietoground
for approximately 400mA. A resistor between ILIM and
ground sets peak current to some intermediate value (see
Figure 5).
W
BLOCK DIAGRAM
D1
V
IN
L1
V
OUT
+
+
C2
C1
SENSE
V
IN
SW
4
2
7
18mV
A2 CURRENT
COMPARATOR
R1
3Ω
+
–
R2
730Ω
500k
A1
OFF
COMPARATOR
+
–
1.25V
REFERENCE
ENABLE OSCILLATOR
155kHZ
A3 DRIVER
BIAS
Q1
160x
Q2
1x
144k
161k
Q3
8.5k
SHUTDOWN
3
GND
SELECT
PGND
8
I
LIM
1
2
5
LT1300 F1
Figure 1.
4
LT1300
TEST CIRCUITS
Oscillator Test Circuit
5V
2V
100Ω
V
IN
I
L
SEL
SW
f
OUT
100µF
LT1300
SHDN
PGND
SENSE
GND
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OPERATION
OperationoftheLT1300isbestunderstoodbyreferringto
the Block Diagram in Figure 1. When A1’s negative input,
related to the Sense pin voltage by the appropriate resis-
tor-dividerratio,ishigherthatthe1.25Vreferencevoltage,
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 the voltage at A1’s nega-
tive input decreases 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 a controlled saturation for
(nominally) 5.3µs or until current comparator A2 trips,
whichevercomesfirst.Afterafixedoff-timeof(nominally)
1.2µs, Q1 turns on again. The LT1300’s switching causes
current to alternately build up in L1 and dump into capaci-
tor 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.
TRACE A
500mA/DIV
ILIM PIN
OPEN
TRACE B
500mA/DIV
ILIM PIN
GROUNDED
20µs/DIV
LT1300 F2
Figure 2. Switch Pin Current With ILIM Floating or Grounded
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 corre-
sponds to a 400mA switch current as shown in Figure 2,
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
fullloadoutputcurrentisacceptable. Lowerpeakcurrents
also extend alkaline battery life due to the alkaline cell’s
highinternalimpedance. Typicaloperatingwaveformsare
shown in Figure 3.
Ifswitchcurrentreaches1A, causingA2totrip, switchon-
timeisreducedandoff-timeincreasesslightly.Thisallows
continuous mode operation during bursts. Current com-
parator A2 monitors the voltage across 3Ω resistor R1
which is directly related to inductor L1’s current. Q2’s
collector current is set by the emitter-area ratio to 0.6%
of Q1’s collector current. When R1’svoltage drop exceeds
18mV, corresponding to 1A inductor current, A2’s output
goes high, truncating the on-time portion of the oscillator
cycle and increasing off-time to about 2µs as shown in
Figure 2, trace A. This programmed peak current can be
VOUT
20mV/DIV
AC COUPLED
VSW
5V/DIV
ISW
IA/DIV
20µS/DIV
LT1300 F2
Figure 3. Burst Mode Operation in Action
5
LT1300
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APPLICATIONS INFORMATION
Output Voltage Selection
L1
10µH
D1
The LT1300 can be selected to 3.3V or 5V 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.
Efficiencyin3.3Vmodewillbeslightlylessthatin5Vmode
due to the fact that the diode drop is a greater percentage
of 3.3V than 5V. Since the bipolar switch in the LT1300
gets its base drive from VIN, no reduction in switch
efficiency occurs when in 3.3V 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 pro-
vides a regulated output with an input voltage above or
below the output (called a buck-boost or SEPIC) is shown
in the Typical Applications section.
SW
V
IN
5V/3.3V
OUTPUT
SELECT
SENSE
+
C1
100µF
LT1300
+
C2
100µF
SHDN
PGND
I
LIM
GND
C3
0.1µF
R1
1M
Figure 4. Addition of R1 and C3 Limit Input Current at Startup
VOUT
2VDIV
Shutdown
IBATTERY
500mA/DIV
The converter can be turned off by pulling SHDN (pin 3)
high. Quiescent current drops to 10µA in this condition.
Bias current of 3µA to 5µA flows into the pin (at 2.5V input).
It is recommended that SHDN not be left floating. Tie the
pin to ground if the feature is not used.
VSHDN
10V/DIV
500µs/DIV
REP RATE = 1Hz
LT1300 F5
Figure 5. Startup Waveforms using Soft-Start Circuitry
ILOAD = 100mA, VOUT = 5V
ILIM Function
The LT1300’s current limit (ILIM) pin can be used for soft
start. Upon start-up, switching regulators require maxi-
mum current from the supply. The high currents flowing
can create IR drops along supply and ground lines and
are especially demanding on alkaline batteries. By in-
stalling an R1 and C3 as shown in Figure 4, the switch
current in the LT1300 is limited to 400mA until the 15µA
flowing out of the ILIM pin charges up the 0.1µF capaci-
tor. Input current is held to under 500mA while the
output voltage ramps up to 5V as shown in Figure 5. The
1Meg resistor provides a discharge path for the capacitor
withoutappreciablydecreasingpeakswitchcurrent.When
the full capability of the LT1300 is not required, peak
current can be reduced by changing the value of R3 as
shown in Figure 6. With R3 = 0, switch current is limited
to approximately 400mA.
1100
1.6V ≤ V ≤ 5V
IN
1000
900
800
700
600
500
400
300
100
1k
10k
(Ω)
100k
1M
R
LIM
LT1300 F1B
Figure 6. Peak Switch Current vs. RLIM
6
LT1300
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APPLICATIONS INFORMATION
Table 1. Recommended Inductors
EFFICIENCY 2.5V , 5V
IN
OUT
COMPONENT
HEIGHT (mm)
PART NUMBER
DO1608-103
DO3316-223
DO1608-223
CTX10-1
CTX20-1
LQH3C2204K0M00 Murata-Frie
CD54-100M
VENDOR
Coilcraft
Coilcraft
Coilcraft
Coiltronics
Coiltronics
L (
µ
H)
DCR (Ω)
0.11
0.050
0.31
0.038
0.175
0.7
0.11
0.38
0.17
0.038
I
PIN
50mA LOAD
200mA LOAD
PHONE NUMBER
LIM
10
22
22
10
20
22
10
22
10
10
Float
Float
83
85
85
85
86
81
85
84
81
85
83
85
—
85
—
—
85
—
82
86
3.5
5.5
3.5
4.2
4.2
2.0
4.5
3.0
(708) 639–6400
Ground
Float
Ground
Ground
Float
Ground
Float
Float
(407) 241–7876
(404) 436–1300
(708) 956–0666
Sumida
Sumida
Sumida
Gowanda
CDRH62-220M
CDRH62-100M
GA10-102K
3.0
6.6 Through-Hole
(716) 532–2234
Table 2. Recommended Capacitors
Inductor Selection
VENDOR
AVX
Sanyo
SERIES
TPS
OS-CON
HFQ
TYPE
PHONE#
For full output power, the inductor should have a satura-
tion 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 conjunc-
tion 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 closed design and inherent EMI/RFI superiority.
Recommended inductors are listed in Table 1.
Surface Mount
Through-Hole
Through-Hole
(803)448–9411
(619) 661–6835
(201) 348–5200
Panasonic
Diode Selection
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.
Capacitor Selection
LowESRcapacitorsarerequiredforbothinputandoutput
of the LT1300. ESR directly affects ripple voltage and
efficiency. ForsurfacemountapplicationsAVXTPSseries
tantalum capacitors are recommended. These have been
specially designed for SMPS and have low ESR along with
high surge current ratings. For through-hole application
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. Low frequency
output ripple can be reduced by adding multiple output
capacitors. If capacitance is reduced, output ripple will
increase. Suggested capacitor sources are listed in Table 2.
Layout Considerations
The LT1300 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.
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
LT1300
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TYPICAL APPLICATIONS N
Four-Cell to 5V/3.3V Up-Down Converter
LCD Contrast Supply
CONTRAST
–4V TO –29V 12mA
MAXIMUM FROM 1.8V SUPPLY
(77% EFFICIENT)
20mA MAXIMUM FROM
3V SUPPLY (83% EFFICIENT)
C2**
L1*
27µH
V
100µF
OUT
2.5V ≤ V ≤ 8V
IN
V
IN
1.8V TO 6V
T1
4
+
N/C
7
3
1
L2*
27µH
22µF
35V
I
V
LIM
IN
1N5817
150K
4×
5V/3.3V
SELECT
SW
AA
CELL
+
8
2
10
+
C1**
100µF
LT1300
5V/3.3V
9
1N5819
220mA
SHDN
GND
SENSE
PGND
SHUTDOWN
80% EFFICIENT
+
C3**
100µF
V
SW
IN
N/C SENSE
SHUTDOWN
SHDN
+
*L1, L2 = GOWANDA GA20-272K
COILCRAFT DO3316-273K
SUMIDA CD73-270K
LT1300
100µF
N/C
I
SELECT
PGND
LIM
**C1, C2, C3 = SANYO OS-CON 16SA100M
LT1300 TA3
GND
12K
12K
+
Step-Up Converter with Automatic Output Disconnect
T1 = DALE LPE-5047-AO45 (605) 665-9301
2.2µF
470Ω
PWM IN
0% TO 100%
CMOS DRIVE 0V TO 5V
L1*
10µH
2N4403
1N5817
LT1300 TA6
5V, 200mA
+
SELECT
SHDN
V
IN
2×
100µF
AA
SHUTDOWN
100µF
SW
CELL
+
LT1300
I
NC
SENSE
PGND
LIM
GND
0.1µF
*SUMIDA CD54-100LC
COILCRAFT DO3316-223
LT1300 TA5
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Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTION
0.400
(10.160)
MAX
0.130 ± 0.005
0.045 – 0.065
0.300 – 0.320
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.128)
8
7
6
5
4
N8 Package
8-Lead Plastic DIP
0.065
(1.651)
TYP
0.250 ± 0.010
(6.350 ± 0.254)
0.009 – 0.015
(0.229 – 0.381)
0.125
0.020
(0.508)
MIN
(3.175)
MIN
+0.025
–0.015
0.045 ± 0.015
(1.143 ± 0.381)
1
2
3
0.325
+0.635
8.255
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
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
S8 Package
8-Lead Plastic S0IC
0.150 – 0.
(3.810 – 3.
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)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
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2
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4
LT/GP 0394 10K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
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LINEAR TECHNOLOGY CORPORATION 1994
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
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