LTC3450EUD#TR_技术文档

LTC3450

Triple Output Power Supply

for Small TFT-LCD Displays

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FEATURES

DESCRIPTIO

■

Generates Three Voltages:

The LTC^®3450 is a complete power converter solution for

small thin film transistor (TFT) liquid crystal display (LCD)

panels. ThedeviceoperatesfromasingleLithium-Ioncell,

2- to 3-cell alkaline input or any voltage source between

1.5V and 4.6V.

5.1V at 10mA

–5V, –10V, or –15V at 500µA

10V or 15V at 500µA

■

Better than 90% Efficiency

■

Low Output Ripple: Less than 5mV_P-P

The synchronous boost converter generates a low noise,

highefficiency5.1V, 10mAsupply. Internalchargepumps

are used to generate 10V, 15V, and –5V, –10V or –15V.

Outputsequencingiscontrolledinternallytoinsureproper

initialization of the LCD panel.

■

Complete 1mm Component Profile Solution

■

Controlled Power-Up Sequence: AV_DD/V_GL/V_GH

■

All Outputs Disconnected and Actively Discharged in

Shutdown

Low Noise Fixed Frequency Operation

■

A master shutdown input reduces quiescent current to

<2µAandquicklydischargeseachoutputforrapidturnoff

of the LCD panel. The LTC3450 is offered in a low profile

(0.75mm), 3mm × 3mm 16-pin QFN package, minimizing

the solution profile and footprint.

Frequency Reduction Input for High Efficiency in

Blank Mode

Ultralow Quiescent Current: 75µA (Typ) in Scan Mode

Available in a 3mm × 3mm 16-Pin QFN Package

■

U

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

APPLICATIO S

■

Cellular Handsets with Color Display

■

Handheld Instruments

■

PDA

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TYPICAL APPLICATIO

5.1V, –10V, 15V Triple Output TFT-LCD Supply

AV_DDEfficiency vs V_IN

47µH

V

IN

AV

DD

1.5V TO

4.6V

5.1V/10mA

8

7

100

2.2µF

0.1µF

5mA LOAD

SW

V

OUT

C1

6

11

10

12

14

13

15

16

+

–

V

IN

95

C1

100µH

4

5

9

MODE

SHDN

GND

V2X

90

BLANK SCAN

OFF ON

47µH

0.47µF

+

C2

LTC3450

0.1µF

85

–

C2

VGH (3 × AV

15V/500µA

)

DD

V3X

80

75

70

V

INV

–

+

V

NEG

C3 C3

0.1µF

3

2

1

0.1µF

3.5

(V)

4.5

5.0

1.5 2.0

2.5 3.0

V

4.0

0.1µF

IN

VGL

3450 TA01b

–10V/500µA

3450 TA01

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LTC3450

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ABSOLUTE AXI U RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1) (Referred to GND)

TOP VIEW

ORDER PART

NUMBER

V_IN, SW.......................................................... –0.3 to 7V

SHDN, MODE................................................. –0.3 to 7V

V_OUT.......................................................................... –0.3 to 5.5V

V_NEG........................................................................ –17V to 0.3V

Operating Temperature Range

LTC3450E (Note 4)............................. –40°C to 85°C

Storage Temperature Range ................. –65°C to 125°C

16 15 14 13

+

LTC3450EUD

C3

1

2

3

4

12 V2X

–

+

11 C1

17

–

V

C1

10

9

NEG

MODE

GND

UD PART MARKING

LAAC

5

6

7

8

UD PACKAGE

16-LEAD (3mm × 3mm) PLASTIC QFN

EXPOSED PAD IS V

MUST BE SOLDERED TO PCB

(PIN 17)

NEG

T_JMAX= 125°C, θ_JA= 68°C/W

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

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 25°C. V_IN= 3.6V, V_OUT= 5.2V unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

4.6

UNITS

V

Input Voltage Range

●

1.5

V

Quiescent Supply Current

MODE = V

75

80

130

µA

IN

Quiescent Supply Current

µA

OUT

IN

Quiescent Supply Current

MODE = GND

SHDN = GND, V

30

50

2

µA

IN

Quiescent Supply Current

13

µA

OUT

Quiescent Current

OPEN

OUT

0.01

µA

IN

5V Boost Regulator

V

Output Voltage

Load on V

= 5mA

5.049

90

5.100

90

5.151

V

%

OUT

Efficiency

= 5mA, (Note 2)

OUT

Maximum Output Current

L = 47µH, (Note 2)

11

mA

kHz

Switch Current Limit

120

550

15.62

Switching Frequency—Boost

Charge Pumps

MODE = V

IN

MODE = GND

V2X Output Voltage

Load on V2X = 100µA

●

9.792

10.1

10.608

V

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LTC3450

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 25°C. V_IN= 3.6V, V_OUT= 5.2V unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

15.2

90

MAX

UNITS

V

V3X Output Voltage

V2X Efficiency

Load on V3X = 100µA

●

14.688

15.912

Load on V2X = 100µA, (Note 2)

Load on V3X = 100µA, (Note 2)

Flying Capacitors = 0.1µF

%

V3X Efficiency

80

%

Output Impedance V2X, V3X

1

kΩ

V

Output Voltage

Efficiency

Load on V

= 100µA, V = V2X

–10.608 –10.1

–9.792

NEG

INV

= 100µA (Note 2)

80

1

%

Output Impedance V

Flying Capacitor = 0.1µF

MODE = V

kΩ

kHz

ms

NEG

Switching Frequency Charge Pumps

62.5

3.75

IN

MODE = GND

(Note 3)

V

to V3X Delay

3

4

10

NEG

Logic Inputs

SHDN Pin Threshold

MODE Pin Threshold

●

0.4

0.77

1.6

1.2

V

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

of a device may be impaired.

Note 3: Measured from point at which V

C2 starts switching.

crosses –5V to point at which

NEG

–

Note 2: Specification is guaranteed by design and not 100% tested in

production.

Note 4: The LTC3450E is guaranteed to meet performance specifications

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

temperature range are assured by design, characterization and correlation

with statistical process controls.

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LTC3450

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(T_A= 25°C unless otherwise noted)

TYPICAL PERFOR A CE CHARACTERISTICS

AV_DDEfficiency vs V_IN

100

95

90

85

80

75

70

100

95

90

85

80

75

70

L = 100µH

L = 47µH

10mA

5mA

10mA

5mA

2mA

3.5

(V)

4.5

5.0

1.5 2.0

2.5 3.0

V

4.0

3.5

(V)

4.5

5.0

1.5 2.0

2.5 3.0

V

4.0

IN

3450 G03

3450 G02

AV_DDvs V_INand Load

No Load V_INCurrent in Blank Mode

No Load V_INCurrent in Scan Mode

100

90

80

70

60

50

40

30

20

10

0

800

700

600

500

400

300

200

100

5.16

5.14

5.12

5.10

5.08

5.06

5.04

0mA

2mA

5mA

10mA

3.5

(V)

4.5 5.0 5.5

3.5

(V)

4.5 5.0 5.5

1.5 2.0

3.5

(V)

4.0

4.5

5.0

1.5 2.0 2.5 3.0

4.0

1.5 2.0 2.5 3.0

4.0

2.5 3.0

V

IN

V

IN

3450 G04

3450 G05

3450 G06

AV_DDvs Temperature

Figure 1 Circuit, 1mA Load

V_GHvs Load

V_GLvs Load

15.6

15.4

15.2

15.0

14.8

14.6

14.4

5.200

5.175

5.150

5.125

5.100

5.075

5.050

5.025

5.000

– 9.0

– 9.2

– 9.4

– 9.6

– 9.8

– 10.0

– 10.2

– 10.4

0

100 200 300 400 500 600 700 800 900 1000

LOAD (µA)

0

100 200 300 400 500 600 700 800 900 1000

LOAD (µA)

– 40 – 25 –10

35

65 80 95

125

110

5

20

50

V

TEMPERATURE (°C)

GL

GH

3450 G07

3450 G09

3450 G08

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LTC3450

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TYPICAL PERFOR A CE CHARACTERISTICS

AV_DDRipple Voltage

AV_DDLoad = 5mA

AV_DDTransient Response

AV

DD

100mV/DIV

(AC)

AV

DD

5mV/DIV

(AC)

5mA

1mA

AV LOAD

DD

5mA/DIV

3450 G10

3450 G11

V

= 3.6V

1µs/DIV

100µs/DIV

V

= 3.6V

IN

C2 = 2.2µF

AV_DDTurn-On Showing Inrush

Current Limiting

AV_DD, V_GL, V_GHTurn-On and

Turn-Off Sequence

INDUCTOR

V

0

CURRENT

GH

10V/DIV

100mA/DIV

0

AV

DD

5V/DIV

AV

DD

2V/DIV

V

GL

5V/DIV

3450 G13

3450 G12

20µs/DIV

V

= 3.6V

2ms/DIV

V

IN

= 3.6V

IN

C2 = 2.2µF

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LTC3450

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C3⁺(Pin 1): Charge Pump Inverter Flying Capacitor Posi-

tive Node. The charge pump inverter flying capacitor is

connected between C3⁺and C3^–. The voltage on C3⁺will

alternate between GND and V_INVat an approximate 50%

duty cycle while the inverting charge pump is operating.

Use a 10nF or larger X5R type ceramic capacitor for best

results.

SW (Pin 8): Switch Pin. Connect the inductor between SW

and V_IN. Keep PCB trace lengths as short and wide as

possible to reduce EMI and voltage overshoot. If the

inductor current falls to zero, the internal P-channel

MOSFET synchronous rectifier is turned off to prevent

reverse charging of the inductor and an internal switch

connects SW to V_INto reduce EMI.

C3^–(Pin 2): Charge Pump Inverter Flying Capacitor Nega-

tive Node. The charge pump inverter flying capacitor is

connected between C3⁺and C3^–. The voltage on C3^–will

alternate between GND and V_NEGat an approximate 50%

duty cycle while the inverting charge pump is operating.

Use a 10nF or larger X5R type ceramic capacitor for best

results.

GND (Pin 9): Signal and Power Ground for the LTC3450.

Provide a short direct PCB path between GND and the

output filter capacitor(s) on V_OUT, V2X, V3X and V_NEG

.

C1^–(Pin 10): Charge Pump Doubler Flying Capacitor

Negative Node. The charge pump doubler flying capacitor

isconnectedbetweenC1⁺andC1^–.ThevoltageonC1^–will

alternate between GND and V_OUTat an approximate 50%

duty cycle while the charge pump is operating. Use a 10nF

or larger X5R type ceramic capacitor for best results.

C1⁺(Pin 11): Charge Pump Doubler Flying Capacitor

Positive Node. The charge pump doubler flying capacitor

isconnectedbetweenC1⁺andC1^–. ThevoltageonC1⁺will

alternate between V_OUTand V2X at an approximate 50%

duty cycle while the charge pump is operating. Use a 10nF

or larger X5R type ceramic capacitor for best results.

V

_NEG(Pin 3): Charge Pump Inverter Output. V_NEGcan be

either –5V or –10V depending on where V_INVis con-

nected. V_NEGshould be bypassed to GND with at 0.1µF or

larger X5R type ceramic capacitor. V_NEGcan also be

configuredfor –15VwithtwoexternallowcurrentSchottky

diodes (see Applications section).

MODE (Pin 4): Drive MODE high to force the LTC3450 into

high power (scan) mode. Drive MODE low to force the

LTC3450 into low power (blank) mode. The output volt-

ages remain active with the MODE pin driven low but with

reduced output current capability. MODE must be pulled

up to V_INor higher on initial application of power in order

for proper initialization to occur.

V2X (Pin 12): Charge Pump Doubler Output. This output

is 10.2V (nom) at no load and is capable of delivering up

to 500µA to a load. V2X should be bypassed to GND with

a 0.47µF X5R type ceramic capacitor.

C2^–(Pin 13): Charge Pump Tripler Flying Capacitor Nega-

tive Node. The charge pump tripler flying capacitor is

connected between C2⁺and C2^–. The voltage on C2^–will

alternate between GND and V_OUTat an approximate 50%

duty cycle while the charge pump is operating. Use a 10nF

or larger X5R type ceramic capacitor for best results.

C2⁺(Pin 14): Charge Pump Tripler Flying Capacitor Posi-

tive Node. The charge pump tripler flying capacitor is

connected between C2⁺and C2^–. The voltage on C2⁺will

alternate between V2X and V3X at an approximate 50%

duty cycle while the charge pump is operating. Use a 10nF

or larger X5R type ceramic capacitor for best results.

SHDN (Pin 5): Master Shutdown Input for the LTC3450.

Driving SHDN low disables all IC functions and reduces

quiescent current from the battery to less than 2µA. Each

generated output voltage is actively discharged to GND in

shutdown through internal pull down devices. An optional

RC network on SHDN provides a slower ramp up of the

boostconverterinductorcurrentduringstartup(soft-start).

V_IN(Pin 6): Input Supply to the LTC3450. Connect V_INto

a voltage source between 1.5V and 4.6V. Bypass V_INto

GND with a 2.2µF X5R ceramic capacitor.

V_OUT(Pin7):Main5.1VOutputoftheBoostRegulatorand

InputtotheVoltageDoublerStage.BypassV_OUTwithalow

ESR,ESLceramiccapacitor(X5Rtype)between2.2µFand

10µF.

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LTC3450

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PI FU CTIO S

V3X (Pin 15): Charge Pump Tripler Output. This output is

15.3V (nom) at no load and is capable of delivering up to

500µA to a load. V3X should be bypassed to GND with a

0.1µF X5R type ceramic capacitor.

Connecting V_INVto 5V or 10V will generate –5V or –10V

respectively on V_NEG. See Applications section for –15V

generation.

Exposed Pad (Pin 17): The exposed pad must be con-

nected to V_NEG(Pin 3) on the PCB. Do not connect the

exposed pad to GND.

V_INV(Pin 16): Positive Voltage Input for the Charge Pump

Inverter. The charge pump inverter will generate a nega-

tive voltage corresponding to the voltage applied to V_INV

.

W

BLOCK DIAGRA

L1

47µH

V

IN

AV

DD

1.5V TO

4.6V

5.1V/10mA

SW

V

OUT

C2

2.2µF

8

7

C1

2.2µF

SYNCHRONOUS

PWM BOOST

CONVERTER

V

IN

SHUTDOWN

+

–

6

C1

11

10

12

CHARGE PUMP

DOUBLER

CF1

0.1µF

IN

V2X

10V

OUT

SHUTDOWN

C7

1µF

OSCILLATOR

550kHz

+

69kHz

C2

MODE

SHDN

14

13

15

CHARGE PUMP

TRIPLER

4

5

BLANK SCAN

OFF ON

CF2

0.1µF

–

C2

IN

V3X

VGH (3 × AV

15V/500µA

)

DD

OUT

SHUTDOWN

GLOBAL SHUTDOWN

C8

0.47µF

V

INV

+

16

1

C3

CHARGE PUMP

INVERTER

CF3

0.1µF

–

2

IN

V

NEG

VGL

–10V/500µA

3

OUT

SHUTDOWN

C11

0.47µF

3450 TA01

9

GND

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LTC3450

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OPERATIO

The LTC3450 is a highly integrated power converter in-

tended for small TFT-LCD display modules. A fixed fre-

quency, synchronous PWM boost regulator generates a

low noise 5.1V, 10mA bias at greater than 90% efficiency

from an input voltage of 1.5V to 4.6V. Three charge pump

converters use the 5.1V output to generate 10V, 15V and

–5V, –10V or –15V at load currents up to 500µA. Each

converter is frequency synchronized to the main 550kHz

(nominal) boost converter. The generated output voltages

are internally sequenced to insure proper initialization of

theLCDpanel.Adigitalshutdowninputrapidlydischarges

each generated output voltage to provide a near instanta-

neous turn-off of the LCD display.

boost converter further reduces its quiescent current in

this mode, delivering both lower input (battery) current

drain and low noise operation.

Charge Pumps

The LTC3450 includes three separate charge pump con-

verters which generate 10V, 15V and either –5V, –10V or

–15V. Each output can deliver a maximum of 500µA. The

charge pumps feature fixed frequency, open-loop opera-

tion for high efficiency and lowest noise performance. The

charge pump converters operate at 1/8 the boost con-

verter frequency and include internal charge transfer

switches.Thus,eachchargepumprequiresonlytwosmall

external capacitors, one to transfer charge, and one for

filtering. Similar to the boost converter, the charge pumps

operating frequency reduces to approximately 4kHz in

blank mode, maintaining low noise operation but at re-

duced output current capability.

Boost Converter

The synchronous boost converter utilizes current mode

control and includes internally set control loop and slope

compensation for optimized performance and simple de-

sign. Only three external components are required to

complete the design of the 5.1V, 10mA boost converter.

The high operation frequency produces very low output

rippleandallowstheuseofsmalllowprofileinductorsand

tiny external ceramic capacitors. The boost converter also

disconnects its output from V_INduring shutdown to avoid

loading the input power source. Softstart produces a

controlled ramp of the converter input current during

startup, reducing the burden on the input power source.

Very low operating quiescent current and synchronous

operation allow for greater than 90% conversion effi-

ciency.

Output Sequencing

Refer to the following text and Figure 1 for the LTC3450

power-up sequence. When input power is applied, the

boost converter initializes and charges its output towards

the final value of 5.1V. When the boost converter output

reaches approximately 90% of its final value (4.5V), an

internal 5V OK signal is asserted which allows the charge

pump doubler to begin operation toward its final goal of

10V. Approximately 1ms later, the charge pump inverter

begins operation toward its final goal of either

–5V or –10V depending on the connection of the V_INV

input. When the –5V or –10V output (V_NEG) reaches

approximately 50% of its final value, a 4ms (nominal)

timeout period begins. At the conclusion of the 4ms

timeout period, the charge pump tripler is allowed to

begin operation, which will eventually charge V3X to 15V

(nominal).

The MODE input reduces the boost converter operating

frequency by approximately 8x when driven high and

reduces the output power capability of the boost con-

verter. MODE is asserted when the polysilicon TFT-LCD

display is in its extremely low power blank condition. The

V

3X

15V

10V

5V

V

2X

V

OUT

V

NEG

1ms

–10V

4ms

3450 F01

Figure 1. Output Sequencing

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LTC3450

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APPLICATIO S I FOR ATIO

Inductor Selection

Soft-Start

Inductors in the range of 47µH to 100µH with saturation

current (I_SAT) ratings of at least 150mA are recommended

for use with the LTC3450. Ferrite core materials are

strongly recommended for their superior high frequency

performance characteristics. A bobbin or toroid type core

will reduce radiated noise. Inductors meeting these re-

quirements are listed in Table 1.

Soft-start operation provides a gradual increase in the

current drawn from the input power source (usually a

battery) during initial startup of the LTC3450, eliminating

the inrush current which is typical in most boost convert-

ers. This reduces stress on the input power source, boost

inductor and output capacitor, reduces voltage sag on the

battery and increases battery life. The rate at which the

input current will increase is set by two external compo-

nents (R_SSand C_SS) connected to SHDN (refer to Figure

2). Upon initial application of power or release of a pull

down switch on SHDN, the voltage on SHDN will increase

relative to the R • C time constant or R_SS• C_SS. After one

time constant SHDN will rise to approximately 63.2% of

the voltage on V_IN. From 0V to approximately 0.77V on

SHDN, no switching will occur because the shutdown

threshold is 0.77V (typ). From 0.77V to 1V the maximum

switch pin current capability of the LTC3450 will gradually

increase from near zero to the maximum current limit. An

R_SSin the range of 1MΩ to 10MΩ is recommended. If

SHDN is driven high with a logic signal, the input current

will gradually increase to its maximum value in approxi-

mately 50µs.

Table 1. Recommended Inductors

PART

NUMBER

L

(µH)

MAX DCR HEIGHT

(Ω)

(mm) VENDOR

CLQ4D10-470

CLQ4D10-101

CMD4D08-470

47

100

47

1.28

3.15

1.6

1.2

Sumida

(847) 956-0666

www.sumida.com

1.0

2.0

DO1606-473

DO1606-104

DT1608-473

DT1608-104

47

100

47

1.1

2.3

0.34

1.1

Coilcraft

(847) 639-6400

2.92 www.coilcraft.com

100

LQH43MN470J03 47

LQH43MN101J03 100

1.5

2.5

2.6

Murata

www.murata.com

DU6629-470M

DU6629-101M

47

100

0.64

1.27

2.92 Coev Magnetics

www.circuitprotection.com

Capacitor Selection

The boost converter requires two capacitors. The input

capacitor should be an X5R type of at least 1µF. The V_OUT

capacitor should also be an X5R type between 2.2µF and

10µF. A larger capacitor (10µF) should be used if lower

output ripple is desired or the output load required is close

to the 10mA maximum.

V

IN

R

1M

5%

SS

5

SHDN

C

SS

6.8nF

The charge pumps require flying capacitors of at least

0.1µFtoobtainspecifiedperformance.CeramicX5Rtypes

are strongly recommended for their low ESR and ESL and

capacitance versus bias voltage stability. The filter capaci-

tor on V2X should be at least 0.1µF. A 0.47µF or larger

capacitor on V2X is recommended if V_INVis connected to

V2X. The filter capacitors on V3X and V_NEGshould be

0.1µF or larger. Please be certain that the capacitors used

are rated for the maximum voltage with adequate safety

margin. Refer to Table 2 for a listing of capacitor vendors.

1ms SOFT-START WITH 3.6V V

IN

3450 F02

Figure 2. Soft-Start Component Configuration

Printed Circuit Board Layout Guidelines

High speed operation of the LTC3450 demands careful

attention to PCB layout. You will not get advertised perfor-

mance with careless layout. Figure 3 shows the recom-

mended component placement for a single layer PCB. A

multilayer board with a separate ground plane is ideal but

not absolutely necessary.

Table 2. Capacitor Vendor Information

Supplier

AVX

Phone

Website

(803) 448-9411

(714) 852-2001

(408) 573-4150

www.avxcorp.com

www.murata.com

www.t-yuden.com

Murata

Taiyo Yuden

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LTC3450

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APPLICATIO S I FOR ATIO

V3X

JUMPER

V

NEG

MODE

SHDN

V

OUT

V

GND

IN

NOTE: QFN PACKAGE EXPOSED PAD

IS CONNECTED TO THE V PIN.

NEG

DO NOT CONNECT EXPOSED PAD TO GROUND

3450 F03

Figure 3. Suggested Layout

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TYPICAL APPLICATIO

5.1V, –15V, 15V Triple Output TFT-LCD Supply

L1

47µH

V

IN

AV

DD

1.5V TO

4.6V

5.1V/10mA

8

7

C1

C2

2.2µF

SW

V

OUT

C1

6

4

5

9

11

10

12

14

13

15

16

+

–

V

IN

CF1

0.1µF

C1

MODE

SHDN

GND

V2X

BLANK SCAN

OFF ON

C4

0.47µF

+

C2

LTC3450

CF2

0.1µF

–

C2

D1

VGH

15V/500µA

V3X

V

INV

C6

0.1µF

–

+

V

C3 C3

D2

0.1µF

NEG

3

2

1

C5

0.1µF

CF3

0.1µF

VGL

–15V/500µA

3450 TA02

D1, D2: DUAL SCHOTTKY DIODE, PANASONIC MA704WKCT

L1: SUMIDA CMD4D08-470

3450fa

10

LTC3450

U

PACKAGE DESCRIPTIO

UD Package

16-Lead Plastic QFN (3mm × 3mm)

(Reference LTC DWG # 05-08-1691)

0.70 ±0.05

3.50 ± 0.05

2.10 ± 0.05

1.45 ± 0.05

(4 SIDES)

PACKAGE OUTLINE

0.25 ±0.05

0.50 BSC

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

BOTTOM VIEW—EXPOSED PAD

0.23 TYP

R = 0.115

(4 SIDES)

TYP

0.75 ± 0.05

3.00 ± 0.10

(4 SIDES)

15 16

PIN 1

TOP MARK

(NOTE 6)

0.40 ± 0.10

1

2

1.45 ± 0.10

(4-SIDES)

(UD) QFN 0603

0.200 REF

0.25 ± 0.05

0.50 BSC

0.00 – 0.05

NOTE:

1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2)

2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION

ON THE TOP AND BOTTOM OF PACKAGE

3450fa

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.

11

LTC3450

U

TYPICAL APPLICATIO

5.1V, –5V, 15V Triple Output TFT-LCD Supply

L1

47µH

V

IN

AV

DD

1.5V TO

4.6V

5.1V/10mA

8

7

C1

C2

2.2µF

SW

V

OUT

C1

6

4

5

9

11

10

12

14

13

15

16

+

–

V

IN

CF1

0.1µF

C1

MODE

SHDN

GND

V2X

BLANK SCAN

OFF ON

C4

0.47µF

+

C2

LTC3450

CF2

0.1µF

–

C2

VGH (3 × AV

15V/500µA

)

DD

V3X

V

INV

C6

0.1µF

–

+

V

C3 C3

NEG

3

2

1

C5

0.1µF

CF3

0.1µF

VGL

L1: SUMIDA CMD4D08-470

–5V/500µA

3450 TA03

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

LT1310

1.5A I , 4.5MHz,

High Efficiency Step-Up DC/DC Converter

V : 2.75V to 18V, V

MSE Package

= 35V, I = 12mA, I = <1µA

OUT Q SD

SW

IN

LT1613

550mA I , 1.4MHz,

High Efficiency Step-Up DC/DC Converter

V : 0.9V to 10V, V

ThinSOT Package

= 34V, I = 3mA, I = <1µA

Q SD

SW

IN

OUT

LT1615/LT1615-1

LT1940

300mA/80mA I , Constant Off-Time,

V : 1.2V to 15V, V

= 34V, I = 20µA, I = <1µA

Q SD

SW

IN

High Efficiency Step-Up DC/DC Converter

ThinSOT Package

Dual Output 1.4A I , Constant 1.1MHz,

V : 3V to 25V, V

IN

(MIN) = 1.2V, I = 2.5mA, I = <1µA

OUT Q SD

OUT

High Efficiency Step-Down DC/DC Converter

TSSOP-16E Package

LT1944

Dual Output 350mA I , Constant Off-Time,

High Efficiency Step-Up DC/DC Converter

V : 1.2V to 15V, V

MS Package

= 34V, I = 20µA, I = <1µA

Q SD

SW

IN

OUT

LT1944-1

Dual Output 150mA I , Constant Off-Time,

V : 1.2V to 15V, V

= 34V, I = 20µA, I = <1µA

Q SD

SW

IN

High Efficiency Step-Up DC/DC Converter

MS Package

LT1945

Dual Output, Pos/Neg, 350mA I , Constant Off-Time,

V : 1.2V to 15V, V

IN

= ±34V, I = 20µA, I = <1µA

Q SD

SW

High Efficiency Step-Up DC/DC Converter

MS Package

LT1946/LT1946A

LT1947

1.5A I , 1.2MHz/2.7MHz,

High Efficiency Step-Up DC/DC Converter

V : 2.45V to 16V, V

MS8 Package

= 34V, I = 3.2mA, I = <1µA

OUT Q SD

SW

IN

Triple Output ( for TFT-LCD) 1.1A I

3MHz High Efficiency Step-Up DC/DC Converter

,

V : 2.7V to 8V, V

= 34V, I = 9.5mA, I = <1µA

SW

IN

OUT Q SD

MS Package

LT1949/LT1949-1

LTC3400/LTC3400B

550mA I , 600kHz/1.1MHz,

High Efficiency Step-Up DC/DC Converter

V : 1.5V to 12V, V

S8, MS8 Packages

= 28V, I = 4.5mA, I = <25µA

Q SD

SW

IN

OUT

600mA I , 1.2MHz,

V : 0.85V to 5V, V

= 5V, I = 19µA/300µA, I = <1µA

Q SD

SW

IN

Synchronous Step-Up DC/DC Converter

ThinSOT Package

LTC3401

LTC3402

1A I , 3MHz, Synchronous Step-Up DC/DC Converter

V : 0.5V to 5V, V

= 5V, I = 38µA, I = <1µA, MS Package

Q SD

SW

IN

OUT

2A I , 3MHz, Synchronous Step-Up DC/DC Converter

V : 0.5V to 5V, V

= 5V, I = 38µA, I = <1µA, MS Package

Q SD

SW

IN

OUT

3450fa

LT/TP 0205 1K REV A • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

12

●

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


型号：	LTC3450EUD#TR
厂家：	Linear
描述：	LTC3450 - Triple Output Power Supply for Small TFT-LCD Displays; Package: QFN; Pins: 16; Temperature Range: -40°C to 85°C CD
文件：	总12页 (文件大小：183K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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