Linear Technology LT1300 Manuale utente

LT1300

■

Up to 220mA Output Current at 5V from 2V Supply

■

Supply Voltage as Low as 1.8V

■

Up to 88% Efficiency

■

Small Inductor –10µH

■

120µA Quiescent Current

■

Shutdown to 10µA

■

Programmable 3.3V or 5V Output

■

LIM

Pin Programs Peak Switch Current

■

Low V

CESAT

Switch: 170mV at 1A Typical

■

Uses Inexpensive Surface Mount Inductors

■

8-Lead DIP or SOIC Package

■

Palmtop Computers

■

Portable Instruments

■

Bar-Code Scanners

■

DC/DC Converter Module Replacements

■

Battery Backup Supplies

■

Personal Digital Assistants

■

PCMCIA Cards

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-

teedat 1.8V input. This allows more energytobeextracted

from the battery increasing operating life. The I

LIM

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

LT1300is available in an8-leadSOIC package, minimizing

board space requirements. For a 5V/12V Selectable Out-

put Converter see the LT1301. For increased output cur-

rent see the LT1302.

DESCRIPTION

FEATURES

TYPICAL APPLICATIONS N

Micropower High Efficiency

3.3/5V Step-Up DC/DC Converter

APPLICATIONS

Two-Cell to 3.3V/5V Step-Up Converter 5V Output Efficiency

L1 = COILCRAFT DO1608-103

OR SUMIDA CD54-100

C1 = AVX TPSD107M010R0100

OR SANYO OS-CON 16SA100M

D1 =MBRS130LT3

OR 1N5817

C1

100µF



5V/3.3V

OUTPUT

L1

10µH D1

C1

100µF

2×

AA

CELL

LIM

PGND GND

SENSE

LT1300

SELECT

LT1300 TA1

5V/3.3V

SELECT

SHDN

SHUTDOWN N/C



LOAD CURRENT (mA)

10 100 500

LT1300 TA2

EFFICIENCY (%)

88 V

= 4.0V

= 3.0V

= 2.5V

= 2.0V

Burst Mode is a trademark of Linear Technology Corporation.

LT1300

ORDER PART

NUMBER

ABSOLUTE MAXIMUMRATINGS

PACKAGE/ORDER INFORMATION

Voltage .............................................................. 10V

SW1 Voltage ............................................................ 20V

Sense Voltage .......................................................... 10V

SHUTDOWN Voltage................................................ 10V

SELECT Voltage ....................................................... 10V

LIM

Voltage ............................................................ 0.5V

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

S8 PART MARKING

JMAX

= 100°C, θ

= 150°C/W 1300

LT1300CN8

LT1300CS8

Consult factory for Industrial grade parts.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Quiescent Current V

SHDN

= 0.5V, V

SEL

= 5V, V

SENSE

= 5.5V ●120 200 µA

SHDN

= 1.8V ●715 µA

Input Voltage Range 1.8 V

●2.0 V

OUT

Output Sense Voltage V

SEL

= 5V ●4.80 5.0 5.20 V

SEL

= 0V ●3.15 3.3 3.45 V

Output Referred V

SEL

= 5V (Note 1) ●22 50 mV

Comparator Hysteresis V

SEL

= 0V (Note 1) ●14 35 mV

Oscillator Frequency Current Limit not Asserted. See Test Circuit. 120 155 185 kHz

Oscillator TC 0.2 %/°C

DC Maximum Duty Cycle 75 86 95 %

Switch On Time Current Limit not Asserted. 5.6 µs

Output Line Regulation 1.8V < V

< 6V ●0.06 0.15 %/V

CESAT

Switch Saturation Voltage I

= 700mA ●130 200 mV

Switch Leakage Current V

= 5V, Switch Off ●0.1 10 µA

Peak Switch Current I

LIM

Floating (See Typical Application) 0.75 1.0 1.25 A

(Internal Trip Point) I

LIM

Grounded 0.4 A

SHDNH

Shutdown Pin High ●1.8 V

SHDNL

Shutdown Pin Low 0.5 V

SELH

Select Pin High ●1.5 V

SELL

Select Pin Low ●0.8 V

SHDN

Shutdown Pin Bias Current V

SHDN

= 5V ●920 µA

SHDN

= 2V ●3µA

SHDN

= 0V ●0.1 1 µA

SEL

Select Pin Bias Current 0V < V

SEL

< 5V ●13 µA

ELECTRICAL CHARACTERISTICS

TA= 25°C, VIN = 2V unless otherwise noted.

Note 1: Hysteresis specified is DC. Output ripple may be higher if

output capacitance is insufficient or capacitor ESR is excessive. See

applications section.

The ●denotes specifications which apply over the 0°C to 70°C

temperature range.

1

2

3

8

7

6

5



TOP VIEW

GND

SEL

SHDN

SENSE

PGND

SW

IN

LIM

N8 PACKAGE

8-LEAD PLASTIC DIP



S8 PACKAGE

8-LEAD PLASTIC SOIC

LT1300

TYPICAL PERFORMANCE CHARACTERISTICS

No-Load Battery Current Total Quiescent Current

in Shutdown

SWITCH CURRENT (A)

0 0.1

CESAT

(mV)

150

125

200

175

250

225

0.8 0.9

LT1300 G5

100

00.2 0.3 0.4 0.5 0.6 0.7 1

Maximum Output Current

vs Input Voltage

Maximum Output Current

vs Input Voltage

200µs/DIV

Transient Response

VIN = 2V, VOUT = 5V Startup Response

VCESAT vs ISW

Efficiency

Shutdown Pin Bias Current

OUT

100mV/DIV

AC COUPLED V

OUT

1V/DIV

SHDN

10V/DIV

LT1300 G8

SHUTDOWN VOLTAGE (V)

SHUTDOWN CURRENT (µA)

245

LT1300 G4

13 6

= 25°C

LOAD CURRENT (mA)

EFFICIENCY (%)

10 100 1000

LT1300 G1

= 3V

= 2V

= 2.5V

OUT

= 3.3V

L = 10µH

INPUT VOLTAGE (V)

1.4

INPUT CURRENT (µA)

150

145

160

155

170

165

3.02.8

LT1300 G2

140

135

130

125

120 1.81.6 2.22.0 2.62.4 3.43.2

OUT

= 5V

OUT

= 3.3V

INPUT VOLTAGE (V)

SHDN

VIN

SENSE

(µA)

LT1300 G3

0246

1357

INPUT VOLTAGE (V)

1.5

OUTPUT CURRENT (mA)

500

600

700

LT1300 G6

400

300

22.5 3.5 4.5

200

100

OUT

= 5V,

LIM

FLOATING

L = 22µH

COILCRAFT

DO3316-223 L = 10µH

COILCRAFT

DO1608-103

INPUT VOLTAGE (V)

1.5

LOAD CURRENT (mA)

100

300

400

500

2.5 3 3.5

900

LT1300 G7

200

2

600

700

800

L = 10µH

VOUT = 3.3V

ILIM FLOATING

OUT

= 5V

LOAD

= 20Ω

LT1300 G9

500µs/DIV

200mA

LOAD

LT1300

PINFUNCTIONS

UUU

GND (Pin 1): Signal Ground.

Sel (Pin 2): Output Select. When tied to V

or V

OUT

converter regulates at 5V. When grounded converter

regulates at 3.3V.

SHDN(Pin3):Shutdown.Pull highto effectshutdown. Tie

to ground for normal operation.

Sense (Pin 4): “Output” Pin.

LIM

(Pin5):Floatfor1Aswitchcurrentlimit. Tie to ground

for approximately 400mA. A resistor between I

LIM

and

ground sets peak current to some intermediate value (see

Figure 5).

(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.

SW (Pin 7): Switch Pin. Connect inductor and diode here.

Keep layout short and direct to minimize electronic radia-

tion.

PGND (Pin 8): Power Ground. Tie to signal ground (pin 1)

under the package. Bypass capacitor from V

should be

tied directly to the pin.

Figure 1.

BLOCK DIAGRAM

OSCILLATOR

155kHZ

R2

730Ω

C2



R1

3Ω

Q2

Q1

160x

18mV

OFF

LIM

PGND

OUT

ENABLE

A1

COMPARATOR

–

1.25V

REFERENCE



L1 D1

SENSE

A2 CURRENT 

COMPARATOR

A3 DRIVER

BIAS Q3

8.5k

SHUTDOWN

SELECT

GND

161k

144k

500k

LT1300 F1

LT1300

TEST CIRCUIT



Oscillator Test Circuit

OPERATION

20µs/DIV

reduced by tying the I

LIM

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 I

loses in Q1, L1, C1 and D1. Efficiency can be increased by

doing this provided that the accompanying reduction in

fullload output current is acceptable. Lower peakcurrents

also extend alkaline battery life due to the alkaline cell’s

highinternalimpedance.Typical operatingwaveforms are

shown in Figure 3.

Operationofthe LT1300 is best understood by referring to

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 V

OUT

decreases enough to force A1’s output

high, and the entire cycle repeats.

Ifswitch current reaches 1A, causing A2 totrip,switchon-

timeisreducedandoff-timeincreasesslightly.Thisallows

continuous mode operation during bursts. Current com-

parator A2 monitors the voltage across 3Ωresistor R1

which is directly related to inductor L1’s current. Q2’s

collector current is set by the emitter-area ratio to 0.6%

ofQ1’s collector current. When R1’s voltage 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 Figure 3. Burst Mode Operation in Action

TRACE B

500mA/DIV

LIM

GROUNDED

LT1300 F2

Figure 2. Switch Pin Current With ILIM Floating or Grounded

TRACE A

500mA/DIV

LIM

OPEN

OUT

20mV/DIV

AC COUPLED

5V/DIV

IA/DIV

20µS/DIV LT1300 F2

100µF

SEL

SENSE

GND PGND

SHDN

LT1300

100Ω

OUT

LT1300

APPLICATIONS INFORMATION

WUU U

Output Voltage Selection

The LT1300 can be selected to 3.3V or 5V under logic

control or fixed at either by tying SELECT to ground or V

respectively. It is permissible to tie SELECT to a voltage

higher than V

as long as it does not exceed 10V.

Efficiencyin3.3Vmodewillbeslightlylessthat in5Vmode

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 V

, no reduction in switch

efficiency occurs when in 3.3V mode. When V

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.

Shutdown

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.

LIM

Function

The LT1300’s current limit (I

LIM

) 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 I

LIM

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.

Figure 4. Addition of R1 and C3 Limit Input Current at Startup

500µs/DIV

REP RATE = 1Hz

LT1300 F5

OUT

2VDIV

BATTERY

500mA/DIV

SHDN

10V/DIV

C2

100µF



C3

0.1µF



R1

5V/3.3V

OUTPUT

L1

10µH D1

C1

100µF

LIM

PGND GND

SENSE

LT1300

SHDN

SELECT

Figure 5. Startup Waveforms using Soft-Start Circuitry

ILOAD = 100mA, VOUT = 5V

LIM

(Ω)

500

SWITCH CURRENT (mA)

700

800

1000

1100

100 10k 100k 1M

LT1300 F1B

300 1k

900

600

400

1.6V ≤VIN ≤5V

Figure 6. Peak Switch Current vs. RLIM

LT1300

COMPONENT

PART NUMBER VENDOR L (

H) DCR (Ω)I

LIM

PIN 50mA LOAD 200mA LOAD HEIGHT (mm) PHONE NUMBER

DO1608-103 Coilcraft 10 0.11 Float 83 83 3.5 (708) 639–6400

DO3316-223 Coilcraft 22 0.050 Float 85 85 5.5

DO1608-223 Coilcraft 22 0.31 Ground 85 — 3.5

CTX10-1 Coiltronics 10 0.038 Float 85 85 4.2 (407) 241–7876

CTX20-1 Coiltronics 20 0.175 Ground 86 — 4.2

LQH3C2204K0M00 Murata-Frie 22 0.7 Ground 81 — 2.0 (404) 436–1300

CD54-100M Sumida 10 0.11 Float 85 85 4.5 (708) 956–0666

CDRH62-220M Sumida 22 0.38 Ground 84 — 3.0

CDRH62-100M Sumida 10 0.17 Float 81 82 3.0

GA10-102K Gowanda 10 0.038 Float 85 86 6.6 Through-Hole (716) 532–2234

APPLICATIONS INFORMATION

WUU U

Table 1. Recommended Inductors

Inductor Selection

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 I

LIM

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.

Capacitor Selection

LowESR capacitors are required forbothinput and output

of the LT1300. ESR directly affects ripple voltage and

efficiency.Forsurface 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 application

Sanyo OS-CON capacitors offer extremely low ESR in a

small size. Again, if peak switch current is reduced using

the I

LIM

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.

Table 2. Recommended Capacitors

VENDOR SERIES TYPE PHONE#

AVX TPS Surface Mount (803)448–9411

Sanyo OS-CON Through-Hole (619) 661–6835

Panasonic HFQ Through-Hole (201) 348–5200

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.

Layout Considerations

The LT1300 is a high speed, high current device. The input

capacitor must be no more than 0.2" from V

(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.

EFFICIENCY 2.5V

, 5V

OUT

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-

tationthattheinterconnectionofitscircuitsas described herein will not infringeonexistingpatentrights.

LT1300

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7487

(408) 432-1900

●

FAX

: (408) 434-0507

●

TELEX

: 499-3977

1234

0.150 – 0.

(3.810 – 3.

8765

0.189 – 0.197*

(4.801 – 5.004)

0.228 – 0.244

(5.791 – 6.197)

0.016 – 0.050

0.406 – 1.270

0.010 – 0.020

(0.254 – 0.508)×45°

0°– 8° TYP

0.008 – 0.010

(0.203 – 0.254)

SO8 0294

0.053 – 0.069

(1.346 – 1.752)

0.014 – 0.019

(0.355 – 0.483)

0.004 – 0.010

(0.101 – 0.254)

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).

S8 Package

8-Lead Plastic S0IC

TYPICAL APPLICATIONS N

 LINEAR TECHNOLOGY CORPORATION 1994

LT/GP 0394 10K • PRINTED IN USA

PACKAGE DESCRIPTION

Dimensions in inches (millimeters) unless otherwise noted.

Four-Cell to 5V/3.3V Up-Down Converter

N8 Package

8-Lead Plastic DIP

N8 0392

0.009 – 0.015

(0.229 – 0.381)

0.300 – 0.320

(7.620 – 8.128)

0.325 +0.025

–0.015

+0.635

–0.381

8.255

()

0.045 ± 0.015

(1.143 ± 0.381)

0.100 ± 0.010

(2.540 ± 0.254)

0.065

(1.651)

TYP

0.045 – 0.065

(1.143 – 1.651)

0.130 ± 0.005

(3.302 ± 0.127)

0.020

(0.508)

MIN

0.018 ± 0.003

(0.457 ± 0.076)

0.125

(3.175)

MIN

12 34

8765

0.250 ± 0.010

(6.350 ± 0.254)



0.400

(10.160)

MAX

100µF

22µF

35V

CONTRAST 

VOUT –4V TO –29V 12mA

MAXIMUM FROM 1.8V SUPPLY 

(77% EFFICIENT)

20mA MAXIMUM FROM 

3V SUPPLY (83% EFFICIENT)

2.2µF

PWM IN

0% TO 100%

CMOS DRIVE 0V TO 5V

150K

12K

10 8

LIM

PGND GND

SENSE

LT1300

SELECT

LT1300 TA6

1N5819

T1 = DALE LPE-5047-AO45 (605) 665-9301

SHDN SHUTDOWN

N/C

IN

1.8V TO 6V

1N5817 2N4403

5V, 200mA

L1*

10µH

*SUMIDA CD54-100LC 

COILCRAFT DO3316-223

100µF

470Ω

0.1µF

2×

AA

CELL SW

ILIM

PGND

GND

SENSE

LT1300

SELECT

LT1300 TA5

SHDN

SHUTDOWN

VIN



Step-Up Converter with Automatic Output Disconnect

LCD Contrast Supply

1N5817

5V/3.3V

220mA

80% EFFICIENT

L1*

27µH

*L1, L2 = GOWANDA GA20-272K

COILCRAFT DO3316-273K

SUMIDA CD73-270K

**C1, C2, C3 = SANYO OS-CON 16SA100M

L2*

27µH

C1**

100µF

C2**

100µF

C3**

100µF

4×

AA

CELL

LIM

PGND

GND

SENSE

LT1300

SELECT

LT1300 TA3

5V/3.3V

2.5V ≤V

≤8V

SHDN

SHUTDOWN

N/C



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