LINEAR TECHNOLOGY LTC1983-3, LTC1983-5 Technical data

查询LTC1983-3供应商

FEATURES

■

Fixed Output Voltages: –3V, –5V or Low Noise V
to –VIN Inverted Output

■

±4% Output Voltage Accuracy

■

Low Quiesient Current: 25µA

■

100mA Output Current Capability

■

3V to 5.5V Operating Voltage Range (LTC1983-3)

■

2.3V to 5.5V Operating Voltage Range (LTC1983-5)

■

Internal 900kHz Oscillator

■

“Zero Current” Shutdown

■

Short-Circuit and Over-Temperature Protected

■

Low Profile (1mm) ThinSOTTM Package

U

APPLICATIO S

■

–3V Generation in Single-Supply Systems

■

Portable Equipment

■

LCD Bias Supplies

■

GaAs FET Bias Supplies

IN

LTC1983-3/LTC1983-5

100mA Regulated

Charge-Pump Inverters

in ThinSOT

U

DESCRIPTIO

The LTC®1983-3 and LTC1983-5 are inverting charge
pump DC/DC converters that produce negative regulated
outputs. The parts require only three tiny external capaci­tors and can provide up to 100mA of output current. The
devices can operate in open loop mode (creating a –V
supply) or regulated output mode depending on the input
supply voltage and the output current.

The LTC1983-3/LTC1983-5 have many useful features for
portable applications including very low quiescent current
(25µA typical) and a zero current shutdown mode pro-
grammed through the SHDN pin.

The LTC1983-3/LTC1983-5 are over-temperature and
short-circuit protected. The parts are available in a 6-pin
low profile (1mm) ThinSOT package.

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

ThinSOT is a trademark of Linear Technology Corporation.

IN

TYPICAL APPLICATIO

–3V at 100mA DC/DC Converter

V

3V TO 5.5V

10µF

OFF ON

IN

C

IN

: TAIYO YUDEN LMK212BJ105

C

FLY

, C

: TAIYO YUDEN JMK316BJ106ML

C

IN

OUT

V

IN

LTC1983-3

SHDN

+

C

C

FLY

1µF

V

GND

OUT

C

–

1983-3 TA01

U

= –3V

V

OUT

= UP TO 100mA

I

OUT

C

OUT

10µF

(V)

OUT

V

–3.3

–3.2

–3.1

–3.0

–2.9

–2.8

–2.7

V

OUT

0

20 40 60 80

I

OUT

vs I

OUT

VIN = 5V

VIN = 3.3V

(mA)

100

1983 TA02

sn1983 1983fs

1

LTC1983-3/LTC1983-5

VCC 1

V

OUT

2

C

+

3

6 SHDN
5 GND
4 C

–

TOP VIEW

S6 PACKAGE

6-LEAD PLASTIC SOT-23

WW

W

ABSOLUTE AXI U RATI GS

U

UUW

PACKAGE/ORDER I FOR ATIO

(Note 1)

VIN to GND................................................... –0.3V to 6V

SHDN Voltage ..............................................–0.3V to 6V

V

to GND (LTC1983-3)..................0.2V to V

OUT

V

to GND (LTC1983-5)..................0.2V to V

OUT

I

Max ............................................................. 125mA

OUT

OUT
OUT

Max
Max

Output Short-Circuit Duration..........................Indefinite

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

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

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

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

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, C

The ● denotes the specifications which apply over the full operating

T

= 1µF, C

FLY

JMAX

= 125°C, θJA = 256°C/W

= 10µF

OUT

ORDER PART

NUMBER

LTC1983ES6-3
LTC1983ES6-5

S6 PART

MARKING

LTPC
LTYB

unless otherwise noted.

PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Operating Voltage (Regulated Output Mode) (LTC1983-3) ● 3.0 5.5 V

Min Startup Voltage 2.3 V

V

IN

V

(LTC1983-3) VIN ≥ 3.3V, I

OUT

V

(LTC1983-5) VIN ≥ 5V, VIN –5V ≥ I

OUT

VIN Operating Current V
VIN Operating Current (Open-Loop Mode) (LTC1983-5) VIN = 3.3V 2.5 mA

VIN Shutdown Current SHDN = 0V, VIN ≤ 5.5V ● 0.1 1 µA
Output Ripple 3.3 ≤ VIN ≤ 5.5 60 mV
Open-Loop Output Impedance (LTC1983-3): R
Open-Loop Output Impedance (LTC1983-5): R

Oscillator Frequency (Non-Burst Mode® Operation) 900 kHz
SHDN Input High ● 1.1 V
SHDN Input Low ● 0.3 V
SHDN Input Current V

OUT

OUT

V

≥ 5V, I

IN

≤ 5.5V, I

IN

V

= 4.75V 4 mA

IN

VIN = 3.3V, V
VIN = 3.3V, I

V

= 5V, I

IN

= 5.5V ● 2.2 4 µA

SHDN

≤ 25mA ● –2.88 –3 –3.12 V

OUT

≤ 100mA ● –2.88 –3 –3.12 V

OUT

• R

OUT

OUT

= 0µA, SHDN = V

OUT

= –3V 11 Ω

OUT

≈ 50mA 11 Ω

OUT

≈ 60mA 8.5 Ω

OUT

IN

● – 4.8 –5 –5.2 V

● 25 60 µA

P-P

Burst Mode is a registered trademark of Linear Technology
Corporation.

Note 1: Absolute Maximum Ratings are those values beyond
which the life of a device may be impaired.

2

Note 2: The LTC1983E-3/LTC1983E-5 are 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.

sn1983 1983fs

UW

TYPICAL PERFOR A CE CHARACTERISTICS

LTC1983-3/LTC1983-5

Efficiency vs I

90

80

70

60

50

40

EFFICIENCY (%)

30

20

10

0

0

Efficiency vs I

100

V

OUT

= 25°C

T

A

75

50

EFFICIENCY (%)

25

OUT

VIN = 2.3V

20 60

40

I

(mA)

OUT

OUT

= –3V

(LTC1983-5)

VIN = 5V

VIN = 3.3V

TA = 25°C

80

= 3.3V

V

IN

VIN = 5V

1983 G01

100

Output Impedance vs
Input Voltage

12.5

12.0

11.5

11.0

10.5

(Ω)

OUT

10.0

R

9.5

9.0

8.5

8.0

2.35

–3V

vs I

OUT

–2.1

–2.3

–2.5

–2.7

(V)

OUT

V

–2.9

–3.1

–3.3

I

= 25mA

OUT

= 25°C

T

A

R

OUT

3.35 5.35

OUT

–40°C, 0°C, 40°C

4.35

VIN (V)

1983 TA02

Over Temperature

120°C

80°C

Output Impedance
vs I

(LTC1983-5)

OUT

30

TA = 25°C

25

20

(Ω)

OUT

R

15

10

5

0

20 60

–3V

vs I

OUT

(VIN = 5V)

3.3
VIN = 5V

3.2

3.1

(–V)

3.0

OUT

V

2.9

2.8

VIN = 2.3V

VIN = 3.3V

40

I

(mA)

OUT

Over Temperature

OUT

–40°C

0°C

40°C

80°C

VIN = 5V

80

1983 G03

100

0

0.01

0.1 1 100
I

(mA)

OUT

Open-Loop Current
vs Temperature (LTC1983-5)

4.9
VIN = 5V

4.7

4.5

4.3

(mA)

IN

I

4.1

3.9

3.7

3.5

–40

10

TEMPERATURE (°C)

10

1983 GO4

60 110

1983 G07

–3.5

0

20 40

OUTPUT CURRENT (mA)

Open-Loop Input Current
vs VIN (LTC1983-5)

4.5
TA = 25°C

4.0

3.5

3.0

(mA)

IN

I

2.5

2.0

1.5

2.3

2.8

3.3 3.3 4.3

80 120

60 100

VIN (V)

1983 G05

4.8

1983 G09

2.7
0

40 60 80

20

OUTPUT CURRENT (mA)

Burst Mode Current
vs Temperature (LTC1983-3)

50

VIN = 5V

45

40

35

30

(µA)

IN

I

25

20

15

10

–40

10 60

TEMPERATURE (°C)

100 120

1983 G06

110

1983 G08

sn1983 1983fs

3

LTC1983-3/LTC1983-5

TEMPERATURE (°C)

–50

0

V

THRESHOLD

(V)

0.1

0.3

0.4

0.5

1.0

0.7

0

50

1983 G12

0.2

0.8

0.9

0.6

100

150

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Burst Mode Input Current
vs VIN (LTC1983-3)

31.0
TA = 25°C

30.5

30.0

29.5

29.0

28.5

28.0

INPUT CURRENT (µA)

27.5

27.0

26.5

3.1

3.6 4.6

4.1
VIN (V)

5.1 5.5

1983 G10

SHDN Pin Input Current
vs Temperature R

3.5

3.0

2.5

2.0

SHDN

I

1.5

1.0

(Ω)

OUT

R

1400

1200

1000

800

(Ω)

OUT

600

R

400

R

vs Temperature

OUT

(I

= 10mA)

OUT

18

I

= 10mA

OUT

16

14

12

10

8

6

4

2

0

–50

vs C

OUT

= 5V

V

IN

= 25°C

T

A

VIN = 3V

0

50

TEMPERATURE (

(V

FLY

IN

VIN = 5V

= 5V)

°C)

100

1983 G11

150

SHDN Pin Threshold Voltage
vs Temperature

V

Start-Up into 100mA

OUT

Resistive Load

V

OUT

1V

V

IN

5V

0.5

0

–50

V

OUT

V

OUT

20mV

4

0 50 150

TEMPERATURE (°C)

100

Ripple at 100mA Load

1µs/DIV 1983 G16

1983 G13

200

V

OUT

20mV

0

0.01

V

Ripple at 30mA Load

OUT

0.1 1

C

(µF)

FLY

2.5µs/DIV

1983 G14

1983 G17

V

OUT

20mV

I

OUT

100mA

50µs/DIV 1983 G15

V

Load Step Reponse from

OUT

I

OUT

= 0 to I

= 100mA

OUT

100µs/DIV

1983 G18

sn1983 1983fs