LT1930AES5_技术文档

LT1930/LT1930A

1A, 1.2MHz/2.2MHz,

Step-Up DC/DC Converters

in ThinSOT

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FEATURES

DESCRIPTIO

The LT^®1930 and LT1930A are the industry’s highest

power SOT-23 switching regulators. Both include an

internal1A,36Vswitchallowinghighcurrentoutputstobe

generated in a small footprint. The LT1930 switches at

1.2MHz, allowing the use of tiny, low cost and low height

capacitors and inductors. The faster LT1930A switches at

2.2MHz, enabling further reductions in inductor size.

Complete regulator solutions approaching one tenth of a

square inch in area are achievable with these devices.

Multiple output power supplies can now use a separate

regulator for each output voltage, replacing cumbersome

quasi-regulated approaches using a single regulator and

custom transformers.

■

1.2MHz Switching Frequency (LT1930)

■

2.2MHz Switching Frequency (LT1930A)

■

Low V_CESATSwitch: 400mV at 1A

■

High Output Voltage: Up to 34V

■

5V at 480mA from 3.3V Input (LT1930)

■

12V at 250mA from 5V Input (LT1930A)

■

Wide Input Range: 2.6V to 16V

■

Uses Small Surface Mount Components

■

Low Shutdown Current: <1µA

Low Profile (1mm) ThinSOT^TMPackage

■

Pin-for-Pin Compatible with the LT1613

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APPLICATIO S

Aconstantfrequencyinternallycompensatedcurrentmode

PWM architecture results in low, predictable output noise

that is easy to filter. Low ESR ceramic capacitors can be

used at the output, further reducing noise to the millivolt

level. The high voltage switch on the LT1930/LT1930A is

rated at 36V, making the device ideal for boost converters

up to 34V as well as for single-ended primary inductance

converter (SEPIC) and flyback designs. The LT1930 can

generate 5V at up to 480mA from a 3.3V supply or 5V at

300mA from four alkaline cells in a SEPIC design.

■

TFT-LCD Bias Supply

■

Digital Cameras

■

Cordless Phones

Battery Backup

Medical Diagnostic Equipment

Local 5V or 12V Supply

External Modems

PC Cards

xDSL Power Supply

■

, LTC and LT are registered trademarks of Linear Technology Corporation

ThinSOT is a trademark of Linear Technology Corporation.

The LT1930/LT1930A are available in the 5-lead ThinSOT

package.

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TYPICAL APPLICATIO

Efficiency

L1

90

D1

V

= 5V

10µH

IN

V

OUT

V

IN

12V

85

80

75

70

65

60

55

50

5V

300mA

V

= 3.3V

IN

5

1

R1

113k

V

SW

C1

IN

C3*

10pF

2.2µF

LT1930

SHDN

C2

4.7µF

4

3

SHDN

FB

R2

13.3k

GND

2

C1: TAIYO-YUDEN X5R LMK212BJ225MG

C2: TAIYO-YUDEN X5R EMK316BJ475ML

D1: ON SEMICONDUCTOR MBR0520

L1: SUMIDA CR43-100

1930/A F01

200

LOAD CURRENT (mA)

0

100

300

400

*OPTIONAL

Figure 1. 5V to 12V, 300mA Step-Up DC/DC Converter

1930 TA01

1

LT1930/LT1930A

W W U W

U W

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ABSOLUTE AXI U RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

ORDER PART

NUMBER

V_INVoltage .............................................................. 16V

SW Voltage ................................................–0.4V to 36V

FB Voltage .............................................................. 2.5V

Current Into FB Pin .............................................. ±1mA

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

Maximum Junction Temperature ......................... 125°C

Operating Temperature Range (Note 2) .. –40°C to 85°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

TOP VIEW

LT1930ES5

LT1930AES5

SW 1

GND 2

FB 3

5 V

IN

4 SHDN

S5 PART MARKING

S5 PACKAGE

5-LEAD PLASTIC SOT-23

LTKS

LTSQ

T_JMAX= 125°C, θ_JA= 256°C/ W

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T_A= 25°C.

V_IN= 3V, V_SHDN= V_INunless otherwise noted. (Note 2)

LT1930

TYP

LT1930A

TYP

PARAMETER

CONDITIONS

MIN

MAX

2.6

MIN

MAX

2.6

UNITS

Minimum Operating Voltage

Maximum Operating Voltage

Feedback Voltage

2.45

V

16

1.240

1.230

1.255

1.270

1.280

1.240

1.230

1.255

1.270

1.280

V

●

FB Pin Bias Current

V

= 1.255V

120

4.2

360

6

240

5.5

720

8

nA

mA

µA

FB

Quiescent Current

= 2.4V, Not Switching

SHDN

Quiescent Current in Shutdown

Reference Line Regulation

Switching Frequency

= 0V, V = 3V

0.01

1.2

1

0.01

2.2

1

IN

2.6V ≤ V ≤ 16V

0.05

%/V

IN

1

0.85

1.4

1.6

1.8

1.6

2.6

2.9

MHz

●

Maximum Duty Cycle

Switch Current Limit

84

1

90

1.2

75

1

90

1.2

%

A

(Note 3)

2

600

1

2.5

600

1

Switch V

I

= 1A

= 5V

400

0.01

400

0.01

mV

µA

V

CESAT

SW

Switch Leakage Current

SHDN Input Voltage High

SHDN Input Voltage Low

SHDN Pin Bias Current

V

SW

2.4

0.5

V

= 3V

= 0V

16

0

32

0.1

35

0

70

0.1

µA

SHDN

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

operating temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 2: The LT1930E/LT1930AE are guaranteed to meet performance

specifications from 0°C to 70°C. Specifications over the –40°C to 85°C

Note 3: Current limit guaranteed by design and/or correlation to static test.

2

LT1930/LT1930A

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TYPICAL PERFOR A CE CHARACTERISTICS

Quiescent Current

FB Pin Voltage

SHDN Pin Current

7.0

6.5

6.0

5.5

5.0

4.5

4.0

3.5

3.0

1.28

1.27

1.26

1.25

1.24

1.23

1.22

90

80

70

60

50

40

30

20

10

0

NOT SWITCHING

LT1930A

LT1930

–10

–50

0

25

50

75

100

–25

–50 –25

0

25

100

0

1

2

4

5

6

50

75

3

TEMPERATURE (°C)

SHDN PIN VOLTAGE (V)

1930/A G02

1930/A G01

1930/A G03

Current Limit

Oscillator Frequency

Switch Saturation Voltage

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

2.5

2.3

2.1

1.9

1.7

1.5

1.3

1.1

0.9

0.7

0.5

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

LT1930A

LT1930

0

10 20 30 40 50 60 70 80 90

–50

–25

0

25

50

75

100

0

0.2

0.4

SWITCH CURRENT (A)

1.0

1.2

0.6

0.8

TEMPERATURE (°C)

DUTY CYCLE (%)

1930/A G04

1930/A G06

1930/A G05

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PI FU CTIO S

SW (Pin 1): Switch Pin. Connect inductor/diode here.

Minimize trace area at this pin to reduce EMI.

SHDN(Pin4):ShutdownPin.Tieto2.4Vormoretoenable

device. Ground to shut down.

GND (Pin 2): Ground. Tie directly to local ground plane.

V_IN(Pin 5): Input Supply Pin. Must be locally bypassed.

FB (Pin 3): Feedback Pin. Reference voltage is 1.255V.

Connect resistive divider tap here. Minimize trace area at

FB. Set V_OUTaccording to V_OUT= 1.255V(1 + R1/R2).

3

LT1930/LT1930A

W

BLOCK DIAGRA

1

SW

1.255V

REFERENCE

V

IN

+

–

5

COMPARATOR

A2

–

+

A1

DRIVER

Q1

R

Q

R

C

S

V

OUT

C

+

–

R1 (EXTERNAL)

0.01Ω

Σ

FB

R2 (EXTERNAL)

RAMP

GENERATOR

SHUTDOWN

4

SHDN

3

FB

2

GND

1930/A BD

1.2MHz

OSCILLATOR*

*2.2MHz FOR LT1930A

Figure 2. Block Diagram

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OPERATIO

The LT1930 uses a constant frequency, current-mode

control scheme to provide excellent line and load regula-

tion. Operation can be best understood by referring to the

block diagram in Figure 2. At the start of each oscillator

cycle, the SR latch is set, which turns on the power switch

Q1. A voltage proportional to the switch current is added

to a stabilizing ramp and the resulting sum is fed into the

positive terminal of the PWM comparator A2. When this

voltageexceedsthelevelatthenegativeinputofA2,theSR

latch is reset turning off the power switch. The level at the

negative input of A2 is set by the error amplifier A1, and is

simply an amplified version of the difference between the

feedback voltage and the reference voltage of 1.255V. In

this manner, the error amplifier sets the correct peak

current level to keep the output in regulation. If the error

amplifier’s output increases, more current is delivered to

the output; if it decreases, less current is delivered. The

LT1930 has a current limit circuit not shown in Figure 2.

The switch current is constantly monitored and not al-

lowed to exceed the maximum switch current (typically

1.2A). Iftheswitchcurrentreachesthisvalue, theSRlatch

is reset regardless of the state of comparator A2. This

current limit helps protect the power switch as well as the

external components connected to the LT1930.

The block diagram for the LT1930A (not shown) is iden-

tical except that the oscillator frequency is 2.2MHz.

4

LT1930/LT1930A

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APPLICATIONS INFORMATION

LT1930 AND LT1930A DIFFERENCES

iron types. Choose an inductor that can handle at least 1A

without saturating, and ensure that the inductor has a low

DCR(copper-wireresistance)tominimizeI²Rpowerlosses.

A 4.7µH or 10µH inductor will be the best choice for most

LT1930 designs. For LT1930A designs, a 2.2µH to 4.7µH

inductor will usually suffice. Note that in some applica-

tions, the current handling requirements of the inductor

can be lower, such as in the SEPIC topology where each

inductor only carries one-half of the total switch current.

Switching Frequency

The key difference between the LT1930 and LT1930A is

thefasterswitchingfrequencyoftheLT1930A.At2.2MHz,

the LT1930A switches at nearly twice the rate of the

LT1930. Care must be taken in deciding which part to use.

The high switching frequency of the LT1930A allows

smaller cheaper inductors and capacitors to be used in a

given application, but with a slight decrease in efficiency

and maximum output current when compared to the

LT1930. Generally, if efficiency and maximum output

current are critical, the LT1930 should be used. If applica-

tion size and cost are more important, the LT1930A will be

the better choice. In many applications, tiny inexpensive

chip inductors can be used with the LT1930A, reducing

solution cost.

Table 1. Recommended Inductors – LT1930

MAX

DCR

(µH) mΩ

SIZE

L × W × H

(mm)

L

PART

VENDOR

CDRH5D18-4R1

CDRH5D18-100

CR43-4R7

4.1

10

4.7

57

124

4.5 × 4.7 × 2.0 Sumida

(847) 956-0666

109 3.2 × 2.5 × 2.0 www.sumida.com

CR43-100

10

182

DS1608-472

DS1608-103

4.7

10

60

75

4.5 × 6.6 × 2.9 Coilcraft

(847) 639-6400

www.coilcraft.com

Duty Cycle

ELT5KT4R7M

ELT5KT6R8M

4.7

6.8

240 5.2 × 5.2 × 1.1 Panasonic

360 (408) 945-5660

The maximum duty cycle (DC) of the LT1930A is 75%

compared to 84% for the LT1930. The duty cycle for a

given application using the boost topology is given by:

www.panasonic.com

Table 2. Recommended Inductors – LT1930A

|V_OUT| – |V |

IN

MAX

DCR

SIZE

L × W × H

(mm)

DC =

L

|V_OUT

|

PART

(µH) mΩ

VENDOR

Fora5Vto12Vapplication,theDCis58.3%indicatingthat

the LT1930A could be used. A 5V to 24V application has

a DC of 79.2% making the LT1930 the right choice. The

LT1930A can still be used in applications where the DC, as

calculated above, is above 75%. However, the part must

beoperatedinthediscontinuousconductionmodesothat

the actual duty cycle is reduced.

LQH3C2R2M24

LQH3C4R7M24

2.2

4.7

126 3.2 × 2.5 × 2.0 Murata

195

(404) 573-4150

www.murata.com

4.5 × 4.0 × 3.0 Sumida

CR43-2R2

CR43-3R3

2.2

3.3

71

86

(847) 956-0666

www.sumida.com

1008PS-272

1008PS-332

2.7

3.3

100 3.7 × 3.7 × 2.6 Coilcraft

110 (800) 322-2645

www.coilcraft.com

204 5.2 × 5.2 × 1.1 Panasonic

(408) 945-5660

www.panasonic.com

ELT5KT3R3M

3.3

INDUCTOR SELECTION

Several inductors that work well with the LT1930 are listed

in Table 1 and those for the LT1930A are listed in Table 2.

These tables are not complete, and there are many other

manufacturers and devices that can be used. Consult each

manufacturer for more detailed information and for their

entireselectionofrelatedparts,asmanydifferentsizesand

shapes are available. Ferrite core inductors should be used

to obtain the best efficiency, as core losses at 1.2MHz are

much lower for ferrite cores than for cheaper powdered-

The inductors shown in Table 2 for use with the LT1930A

were chosen for small size. For better efficiency, use

similar valued inductors with a larger volume. For

example, the Sumida CR43 series in values ranging from

2.2µH to 4.7µH will give an LT1930A application a few

percentage points increase in efficiency, compared to the

smaller Murata LQH3C Series.

5

LT1930/LT1930A

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APPLICATIONS INFORMATION

CAPACITOR SELECTION

By choosing the appropriate values for the resistor and

capacitor, the zero frequency can be designed to improve

the phase margin of the overall converter. The typical

target value for the zero frequency is between 35kHz to

55kHz. Figure 3 shows the transient response of the step-

up converter from Figure 1 without the phase lead capaci-

torC3. Thephasemarginisreducedasevidencedbymore

ringing in both the output voltage and inductor current. A

10pF capacitor for C3 results in better phase margin,

which is revealed in Figure 4 as a more damped response

andlessovershoot. Figure5showsthetransientresponse

when a 33µF tantalum capacitor with no phase lead

capacitor is used on the output. The higher output voltage

ripple is revealed in the upper waveform as a set of double

lines. The transient response is not greatly improved

which implies that the ESR zero frequency is too high to

increase the phase margin.

Low ESR (equivalent series resistance) capacitors should

beusedattheoutputtominimizetheoutputripplevoltage.

Multi-layer ceramic capacitors are an excellent choice, as

they have extremely low ESR and are available in very

small packages. X5R dielectrics are preferred, followed by

X7R, as these materials retain the capacitance over wide

voltage and temperature ranges. A 4.7µF to 10µF output

capacitor is sufficient for most applications, but systems

withverylowoutputcurrentsmayneedonlya1µFor2.2µF

outputcapacitor. SolidtantalumorOSCONcapacitorscan

be used, but they will occupy more board area than a

ceramicandwillhaveahigherESR.Alwaysuseacapacitor

with a sufficient voltage rating.

Ceramic capacitors also make a good choice for the input

decoupling capacitor, which should be placed as close as

possible to the LT1930/LT1930A. A 1µF to 4.7µF input

capacitorissufficientformostapplications.Table3shows

a list of several ceramic capacitor manufacturers. Consult

the manufacturers for detailed information on their entire

selection of ceramic parts.

V_OUT

0.2V/DIV

AC COUPLED

I_LI

0.5A/DIV

AC COUPLED

Table 3. Ceramic Capacitor Manufacturers

Taiyo Yuden

AVX

(408) 573-4150

(803) 448-9411

(714) 852-2001

www.t-yuden.com

www.avxcorp.com

www.murata.com

250mA

LOAD

CURRENT

150mA

50µs/DIV

1930 F03

Murata

Figure 3. Transient Response of Figure 1's Step-Up

Converter without Phase Lead Capacitor

ThedecisiontouseeitherlowESR(ceramic)capacitorsor

the higher ESR (tantalum or OSCON) capacitors can affect

the stability of the overall system. The ESR of any capaci-

tor, along with the capacitance itself, contributes a zero to

the system. For the tantalum and OSCON capacitors, this

zero is located at a lower frequency due to the higher value

of the ESR, while the zero of a ceramic capacitor is at a

much higher frequency and can generally be ignored.

V_OUT

0.2V/DIV

AC COUPLED

I_LI

0.5A/DIV

AC COUPLED

250mA

150mA

LOAD

CURRENT

A phase lead zero can be intentionally introduced by

placing a capacitor (C3) in parallel with the resistor (R1)

betweenV_OUTandV_FBasshowninFigure1.Thefrequency

of the zero is determined by the following equation.

50µs/DIV

1930 F04

Figure 4. Transient Response of Figure 1's Step-Up

Converter with 10pF Phase Lead Capacitor

1

ƒ_Z=

2π •R1•C3

6

LT1930/LT1930A

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APPLICATIONS INFORMATION

LAYOUT HINTS

V_OUT

0.2V/DIV

AC COUPLED

The high speed operation of the LT1930/LT1930A

demandscarefulattentiontoboardlayout. Youwillnotget

advertised performance with careless layout. Figure 6

shows the recommended component placement.

I_LI

0.5A/DIV

AC COUPLED

LOAD

250mA

CURRENT 150mA

200µs/DIV

1930 F04

Figure 5. Transient Response of Step-Up Converter with 33µF

Tantalum Output Capacitor and No Phase Lead Capacitor

L1

D1

C1

V

IN

OUT

DIODE SELECTION

+

C2

SHUTDOWN

ASchottkydiodeisrecommendedforusewiththeLT1930/

LT1930A. The Motorola MBR0520 is a very good choice.

Where the switch voltage exceeds 20V, use the MBR0530

(a 30V diode). Where the switch voltage exceeds 30V, use

the MBR0540 (a 40V diode). These diodes are rated to

handle an average forward current of 0.5A. In applications

where the average forward current of the diode exceeds

0.5A, a Microsemi UPS5817 rated at 1A is recommended.

R2

R1

C3

GND

1930 F06

Figure 6. Suggested Layout

Driving SHDN Above 10V

The maximum voltage allowed on the SHDN pin is 10V. If

you wish to use a higher voltage, you must place a resistor

in series with SHDN. A good value is 121k. Figure 7 shows

a circuit where V_IN= 16V and SHDN is obtained from V_IN.

The voltage on the SHDN pin is kept below 10V.

SETTING OUTPUT VOLTAGE

To set the output voltage, select the values of R1 and R2

(see Figure 1) according to the following equation.

V_OUT

1.255V

R1= R2

– 1

A good value for R2 is 13.3k which sets the current in the

resistor divider chain to 1.255V/13.3k = 94.7µA.

D1

L1

V

IN

16V

V

OUT

5

1

V

SW

IN

R1

R2

121k

C1

LT1930

C2

4

3

SHDN

FB

GND

2

1930 F07

Figure 7. Keeping SHDN Below 10V

7

LT1930/LT1930A

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TYPICAL APPLICATIO S

Efficiency

4-Cell to 5V SEPIC Converter

80

75

70

65

60

55

50

45

40

V

= 6.5V

IN

C3

1µF

L1

10µH

D1

V

IN

= 4V

V

4V TO 6.5V

OUT

5V

300mA

5

1

V

SW

C1

IN

2.2µF

243k

LT1930

SHDN

4-CELL

BATTERY

4

3

L2

10µH

C2

10µF

SHDN

FB

GND

2

82.5k

1930 TA02a

C1: TAIYO-YUDEN X5R LMK212BJ225MG

C2: TAIYO-YUDEN X5R JMK316BJ106ML

C3: TAIYO-YUDEN X5R LMK212BJ105MG

D1: ON SEMICONDUCTOR MBR0520

L1, L2: MURATA LQH3C100K24

200

LOAD CURRENT (mA)

0

100

300

400

500

1930 TA02b

4-Cell to 5V SEPIC Converter with Coupled Inductors

5V to 24V Boost Converter

C3

L1A

L1

1µF

D1

10µH

V

10µH

V

4V TO 6.5V

OUT

•

OUT

V

IN

5V

24V

300mA

5

1

90mA

5

1

V

SW

C1

V

SW

IN

C1

R1

665k

IN

2.2µF

4.7µF

•

243k

LT1930

SHDN

4-CELL

BATTERY

C2

2.2µF

4

3

4

3

L1B

10µH

C2

10µF

SHDN

FB

SHDN

FB

GND

2

R2

36.5k

GND

2

82.5k

C1: TAIYO-YUDEN X5R LMK212BJ225MG

C2: TAIYO-YUDEN X5R JMK316BJ106ML

C3: TAIYO-YUDEN X5R LMK212BJ105MG

D1: ON SEMICONDUCTOR MBR0520

L1: SUMIDA CLS62-100

C1: TAIYO-YUDEN X5R EMK316BJ475ML

C2: TAIYO-YUDEN X5R JMK212BJ475MG

D1: ON SEMICONDUCTOR MBR0530

L1: SUMIDA CR43-100

1930/A TA03

1930/A TA04

±15V Dual Output Converter with Output Disconnect

C4

1µF

L1

3.3µH

D1

V

15V

70mA

IN

5V

5

1

C5

1µF

V

SW

C1

R1

147k

IN

2.2µF

LT1930

D2

C2

2.2µF

4

3

OFF ON

SHDN

FB

R2

13.3k

GND

2

C6

2.2µF

C1: TAIYO-YUDEN X5R LMK212BJ225MG

C2, C3: TAIYO-YUDEN X5R EMK316BJ225ML

C4, C5: TAIYO-YUDEN X5R TMK316BJ105ML

(408) 573-4150

D3

D4

–15V

70mA

1930/A TA05

D1 TO D4: ON SEMICONDUCTOR MBR0520 (800) 282-9855

L1: SUMIDA CR43-3R3 (874) 956-0666

8

LT1930/LT1930A

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TYPICAL APPLICATIO S

Boost Converter with Reverse Battery Protection

L1

4.7µH

D1

M1

V

OUT

IN

8V

3V to 6V

5

1

C1

2.2µF

C3

47pF

520mA AT V = 6V

240mA AT V = 3V

IN

V

SW

IN

R1

60.4k

LT1930

4

3

C2

22µF

SHDN

FB

R2

11.3k

GND

2

C1: TAIYO-YUDEN X5R LMK432BJ226MM

C2: TAIYO-YUDEN X5R LMK212BJ225MG

D1: ON SEMICONDUCTOR MBR0520

L1: SUMIDA CR43-4R7

1930/A TA06

M1: SILICONIX Si6433DQ

Efficiency

3.3V to 5V Boost Converter

90

85

80

75

L1

D1

5.6µH

V

= 3.3V

V

IN

OUT

V

IN

5V

3.3V

480mA

5

1

V

SW

C1

R1

V

= 2.6V

IN

4.7µF

40.2k

LT1930

C2

10µF

4

3

70

65

OFF ON

SHDN

FB

R2

13.3k

GND

2

60

55

50

C1: TAIYO-YUDEN X5R JMK212BJ475MG www.t-yuden.com

C2: TAIYO-YUDEN X5R JMK316BJ106ML

D1: ON SEMICONDUCTOR MBR0520 www.onsemi.com

L1: SUMIDA CR43-5R6 www.sumida.com

1930/A TA07a

100

200

400

0

500

300

LOAD CURRENT (mA)

1930/A TA07b

5V to 12V, 250mA Step-Up Converter

Efficiency

90

85

80

75

L1

V

= 5V

OUT

IN

D1

2.2µH

= 12V

V

OUT

V

IN

12V

5V

250mA

5

1

V

SW

C1

IN

R1

2.2µF

115k

LT1930A

SHDN

C2

2.2µF

4

3

70

65

SHDN

FB

R2

13.3k

GND

2

60

55

50

C1: TAIYO-YUDEN X5R LMK212BJ225MG

C2: TAIYO-YUDEN X5R EMK316BJ225ML

D1: ON SEMICONDUCTOR MBR0520

L1: MURATA LQH3C2R2M24

1930/A TA08a

50

100

200

0

250

300

150

LOAD CURRENT (mA)

1930/A TA08b

9

LT1930/LT1930A

U

TYPICAL APPLICATIO S

9V, 18V, –9V Triple Output TFT-LCD Bias Supply with Soft-Start

D1

D2

C3

18V

10mA

C4

0.1µF

1µF

Start-Up Waveforms

L1

4.7µH

D5

V

9V

200mA

IN

3.3V

9V OUTPUT

5V/DIV

5

1

R1

124k

+

V

SW

IN

C1

2.2µF

R

LT1930

SS

30k

C5

10µF

–9V OUTPUT

5V/DIV

4

3

V

SHDN

FB

SS

D

SS

3.3V

GND

2

1N4148

R2

20k

18V OUTPUT

10V/DIV

0V

C2

0.1µF

C

SS

68nF

C1: X5R OR X7R, 6.3V

C2,C3, C5: X5R OR X7R, 10V

C4: X5R OR X7R, 25V

D1- D4: BAT54S OR EQUIVALENT

D5: MBR0520 OR EQUIVALENT

L1: PANASONIC ELT5KT4R7M

D4

D3

I

_L10.5A/DIV

2ms/DIV

C6

1µF

–9V

10mA

1930/A TA11a

8V, 23V, –8V Triple Output TFT-LCD Bias Supply with Soft-Start

D1

D2

D3

D4

23V

10mA

C3

0.1µF

C4

0.1µF

C5

0.1µF

C6

1µF

Start-Up Waveforms

L1

4.7µH

D7

V

8V

220mA

IN

3.3V

8V OUTPUT

5V/DIV

5

1

R1

113k

+

V

SW

IN

C1

2.2µF

R

LT1930

SS

–8V OUTPUT

5V/DIV

C7

10µF

30k

4

3

V

SS

SHDN

FB

D

SS

3.3V

GND

2

1N4148

R2

21k

0V

23V OUTPUT

10V/DIV

C2

0.1µF

C

SS

68nF

C1: X5R OR X7R, 6.3V

I_L10.5A/DIV

D5

D6

C2-C4, C7, C8: X5R OR X7R, 10V

C5: X5R OR X7R, 16V

2ms/DIV

C8

1µF

C6: X5R OR X7R, 25V

D1- D6: BAT54S OR EQUIVALENT

D7: MBR0520 OR EQUIVALENT

L1: PANASONIC ELT5KT4R7M

–8V

10mA

1930/A TA12a

10

LT1930/LT1930A

U

PACKAGE DESCRIPTIO

S5 Package

5-Lead Plastic SOT-23

(Reference LTC DWG # 05-08-1633)

(Reference LTC DWG # 05-08-1635)

2.80 – 3.10

(.110 – .118)

(NOTE 3)

SOT-23

(Original)

SOT-23

(ThinSOT)

.90 – 1.45

1.00 MAX

A

A1

A2

L

(.035 – .057)

(.039 MAX)

.00 – .15

(.00 – .006)

.01 – .10

(.0004 – .004)

2.60 – 3.00

1.50 – 1.75

(.102 – .118) (.059 – .069)

(NOTE 3)

.90 – 1.30

(.035 – .051)

.80 – .90

(.031 – .035)

.35 – .55

(.014 – .021)

.30 – .50 REF

(.012 – .019 REF)

PIN ONE

.95

(.037)

REF

.25 – .50

(.010 – .020)

(5PLCS, NOTE 2)

.20

(.008)

A2

A

DATUM ‘A’

1.90

(.074)

REF

L

.09 – .20

(.004 – .008)

(NOTE 2)

A1

S5 SOT-23 0401

NOTE:

1. CONTROLLING DIMENSION: MILLIMETERS

MILLIMETERS

2. DIMENSIONS ARE IN

(INCHES)

3. DRAWING NOT TO SCALE

4. DIMENSIONS ARE INCLUSIVE OF PLATING

5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

6. MOLD FLASH SHALL NOT EXCEED .254mm

7. PACKAGE EIAJ REFERENCE IS:

SC-74A (EIAJ) FOR ORIGINAL

JEDEL MO-193 FOR THIN

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 its circuits as described herein will notinfringe onexisting patent rights.

11

LT1930/LT1930A

U

TYPICAL APPLICATIO

3.3V to 5V, 450mA Step-Up Converter

L1

2.2µH

D1

V

OUT

V

IN

5V

3.3V

450mA

5

1

V

SW

C1

R1

30.1k

IN

2.2µF

LT1930A

SHDN

C2

10µF

4

3

SHDN

FB

R2

10k

GND

2

C1: TAIYO-YUDEN X5R LMK212BJ225MG

C2: TAIYO-YUDEN X5R JMK316B106ML

D1: ON SEMICONDUCTOR MBR0520

L1: MURATA LQH3C2R2M24

1930/A TA09a

Efficiency

90

85

80

75

V

= 3.3V

OUT

IN

3.3V to 5V Transient Response

= 5V

V_OUT

50mV/DIV

AC COUPLED

70

65

I_LI

0.5A/DIV

AC COUPLED

300mA

LOAD

60

55

50

CURRENT

200mA

20µs/DIV

1930 F03

100

200

400

0

500

300

LOAD CURRENT (mA)

1930/A TA09b

RELATED PARTS

PART NUMBER

LT1307

DESCRIPTION

Single Cell Micropower 600kHz PWM DC/DC Converter

Burst Mode^TMOperation DC/DC Converter with Programmable Current Limit 1.5V Minimum, Precise Control of Peak Current Limit

COMMENTS

3.3V at 75mA from Single Cell, MSOP Package

LT1316

LT1317

2-Cell Micropower DC/DC Converter with Low-Battery Detector

Single Cell Micropower DC/DC Converter

3.3V at 200mA from 2 Cells, 600kHz Fixed Frequency

3V at 30mA from 1V, 1.7MHz Fixed Frequency

–5V at 150mA from 5V Input, ThinSOT Package

5V at 200mA from 3.3V Input, ThinSOT Package

20V at 12mA from 2.5V, ThinSOT Package

LT1610

LT1611

Inverting 1.4MHz Switching Regulator in 5-Lead ThinSOT

1.4MHz Switching Regulator in 5-Lead ThinSOT

LT1613

LT1615

Micropower Constant Off-Time DC/DC Converter in 5-Lead ThinSOT

Micropower Inverting DC/DC Converter in 5-Lead ThinSOT

Inverting 1.2MHz/2.2MHz Switching Regulator in 5-Lead ThinSOT

LT1617

–15V at 12mA from 2.5V Input, ThinSOT Package

–5V at 350mA from 5V input, ThinSOT Package

LT1931/LT1931A

Burst Mode is a trademark of Linear Technology Corporation.

1930af LT/TP 0801 2K • PRINTED IN USA

LINEAR TECHNOLOGY CORPORATION 2001

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

12

●

(408) 432-1900 FAX: (408) 434-0507 www.linear.com


型号：	LT1930AES5
厂家：	Linear
描述：	1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters 1A ， 1.2MHz的/ 2.2MHz的，升压型DC / DC转换器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12页 (文件大小：192K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT1930AES5 [Linear]

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LT1930AES5#PBF

LT1930AES5#TRM

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LT1930AES5#TRPBF

LT1930A_15

LT1930ES5

LT1930ES5#PBF

LT1930ES5#TR

LT1930ES5#TRM

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LT1930ES5#TRPBF

LT1930_15