LT1303_技术文档

LT1303/LT1303-5

Micropower High Efficiency

DC/DC Converters with

Low-Battery Detector

Adjustable and Fixed 5V

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DESCRIPTION

FEATURES

The LT^®1303/LT1303-5 are micropower step-up high

efficiency DC/DC converters using Burst Mode^TMopera-

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 V_CESATSwitch: 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

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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

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ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

V_INVoltage .............................................................. 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

T

Consult factory for Industrial and Military grade parts.

ELECTRICAL CHARACTERISTICS

T_A= 25°C, V_IN= 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

Q

SEL

V

Input Voltage Range

1.8

2.0

1.22

4.8

1.55

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

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

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

= 1V

= 100µA

= 1.3V, V

LBI

I

LOAD

V

LBI

= 5V

LBO

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

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

V_CESATvs Switch Current

V_CESATvs 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

–50 –25

25

50

75

100

0

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)

LT1303 G07

LT1303 G09

LT1303 G08

3

LT1303/LT1303-5

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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)

LT1303 G10

LT1303 G11

LT1303 G12

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)

LT1303 G14

LT1303 G15

LT1303 G13

Transient Response

Figure 1 Circuit

Low Battery Detector Transient

Response

Shutdown Pin Response

5V

V_OUT

100mV/DIV

AC COUPLED

V_LBO

2V/DIV

V_OUT

1V/DIV

200mA

I_LOAD

V_TRIP+10mV

0mA

V_LBI

V_SHDN

5V/DIV

V_TRIP–10mV

LT1303 G17

LT1303 G18

200µs/DIV

LT1303 G16

5µs/DIV

500µs/DIV

V_IN= 2V

R_LOAD= 100Ω

R_PULL-UP= 47k

V

_OUT= 5V

V

_IN= 2V

V_OUT= 5V

C_OUT= 100µF

4

LT1303/LT1303-5

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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.

V_IN(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 V_INshould be

tied directly to PGND within 0.2" of the device.

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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

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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

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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

untilV_OUTdecreasesenoughtoforceC1’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%.

V_OUT

100mV/DIV

AC COUPLED

V_SW

5V/DIV

I_L

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

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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

= 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.

I_L

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

33µH

Figure 7. Properly Chosen Inductor Does Not Saturate

Sumida

Gowanda

CD54

GA10

10µH to 33µH

(708) 956-0666

(716) 532-2234

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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 V_INpin 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 I_L≈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 V_INPin 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

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

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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

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

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LT1303/LT1303-5

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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

+

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

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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


型号：	LT1303
厂家：	Linear
描述：	Micropower High Efficiency DC/DC Converters with Low-Battery Detector Adjustable and Fixed 5V 微功耗高效率DC / DC与低电池电压检测器可调和固定5V转换器转换器电池
文件：	总12页 (文件大小：281K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT1303 [Linear]

相关型号：

LT1303-5

LT1303-5_15

LT1303CN8

LT1303CN8-3.3

LT1303CN8-5

LT1303CN8-5#PBF

LT1303CS8

LT1303CS8#PBF

LT1303CS8#TR

LT1303CS8#TRPBF

LT1303CS8-3.3

LT1303CS8-3.3#TR