Linear Technology LT1117CST, LT1117CM-5, LT1117CM-3.3, LT1117CM-2.85, LT1117IST-5 Datasheet

FEATURES

LT1117/LT1117-2.85

LT1117-3.3/LT1117-5

800mA Low Dropout

Positive Regulators

Adjustable and Fixed 2.85V,

3.3V, 5V

U

DESCRIPTIO

■

Space Saving SOT-223 Surface Mount Package

■

3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V

■

Output Current of 800mA

■

Operates Down to 1V Dropout

■

Guaranteed Dropout Voltage at Multiple Current Levels

■

0.2% Line Regulation Max

■

0.4% Load Regulation Max

U

APPLICATIO S

■

Active SCSI Terminators

■

High Efficiency Linear Regulators

■

Post Regulators for Switching Supplies

■

Battery Chargers

■

5V to 3.3V Linear Regulators

The LT®1117 is a positive low dropout regulator designed
to provide up to 800mA of output current. The device is
available in an adjustable version and fixed output voltages
of 2.85V, 3.3V and 5V. The 2.85V version is designed
specifically to be used in Active Terminators for the SCSI
bus. All internal circuitry is designed to operate down to 1V
input to output differential. Dropout voltage is guaranteed
at a maximum of 1.2V at 800mA, decreasing at lower load
currents. On chip trimming adjusts the reference/output
voltage to within ±1%. Current limit is also trimmed in
order to minimize the stress on both the regulator and the
power source circuitry under overload conditions.

The low profile surface mount SOT-223 package allows
the device to be used in applications where space is
limited. The LT1117 requires a minimum of 10µF of output
capacitance for stability. Output capacitors of this size or
larger are normally included in most regulator designs.

Unlike PNP type regulators where up to 10% of the output
current is wasted as quiescent current, the quiescent
current of the LT1117 flows into the load, increasing
efficiency.

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

TYPICAL APPLICATIO

Active Terminator for SCSI-2 Bus

LT1117-2.85

4.75V TO

5.25V

IN

+ +

10µF

OUT

GND

U

22µF

110Ω
110Ω
110Ω

110Ω

LT1117 • TA01

18 TO 27
LINES

Dropout Voltage (VIN – V

1.4

1.2

1.0

0.8

0.6

0.4

DROPOUT VOLTAGE (V)

0.2

0

TJ = 25°C

TJ = 125°C

INDICATES GUARANTEED TEST POINT

100 400 600 800

0

200 300 500 700

–40°C ≤ TJ < 0°C

0°C ≤ T

OUTPUT CURRENT (mA)

≤ 125°C

J

)

OUT

LT1117 • TPC01

1

LT1117/LT1117-2.85
LT1117-3.3/LT1117-5

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Input Voltage

Operating Voltage

LT1117, LT1117-3.3, LT1117-5 ...................... 15V

LT1117-2.85 ................................................... 10V

Surge Voltage

LT1117, LT1117-3.3, LT1117-5 ...................... 20V

UU

W

PACKAGE/ORDER I FOR ATIO

ORDER PART

NUMBER

LT1117CST
LT1117CST-2.85

FRONT VIEW

3

IN

TAB IS

V

OUT

ST PACKAGE

3-LEAD PLASTIC SOT-223

T

= 125°C,θ

J MAX

Consult factory for Military grade parts.

2

1

= 15°C/W

JC

OUT

ADJ/GND

LT1117CST-3.3
LT1117CST-5
LT1117IST
LT1117IST-2.85
LT1117IST-3.3
LT1117IST-5

ST PART MARKING

1117
11172
11173
11175

1117I
11172I
11173I
11175I

Operating JunctionTemperature Range

C Grade ................................................. 0°C to 125°C

I Grade ............................................. –40°C to 125°C

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

Lead Temperature................... (See Soldering Methods)

ORDER PART

NUMBER

LT1117CM
LT1117CM-2.85
LT1117CM-3.3
LT1117CM-5

DD PART MARKING

TAB IS

V

OUT

T

J MAX

FRONT VIEW

3

2

1

M PACKAGE

3-LEAD PLASTIC DD

= 125°C,θ

= 10°C/W

JC

IN

OUT

ADJ/GND

1117
11172
11173
11175

ELECTRICAL CHARACTERISTICS

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

PARAMETER CONDITIONS MIN TYP MAX UNITS

Reference Voltage LT1117 I

Output Voltage LT1117-2.85 I

LT1117-3.3 I

LT1117-5 I

Line Regulation LT1117 I

LT1117-2.85 I
LT1117-3.3 I
LT1117-5 I

= 10mA, (VIN – V

OUT

10 ≤ I

0 ≤ I
0 ≤ I

0 ≤ I

0 ≤ I

≤ 800mA, 1.4V ≤ (VIN – V

OUT

= 10mA, VIN = 4.85V, TJ = 25°C 2.820 2.850 2.880 V

OUT

≤ 800mA, 4.25V ≤ VIN ≤ 10V ● 2.790 2.850 2.910 V

OUT

≤ 500mA, VIN = 3.95V ● 2.790 2.850 2.910 V

OUT

= 10mA, VIN = 5V, TJ = 25°C 3.267 3.300 3.333 V

OUT

≤ 800mA, 4.75V ≤ VIN ≤ 10V ● 3.235 3.300 3.365 V

OUT

= 10mA, VIN = 7V, TJ = 25°C 4.950 5.000 5.050 V

OUT

≤ 800mA, 6.50V ≤ VIN ≤ 12V ● 4.900 5.000 5.100 V

OUT

= 10mA, 1.5V ≤ VIN – V

OUT

= 0mA, 4.25V ≤ VIN ≤ 10V (Note 2) ● 16 mV

OUT

= 0mA, 4.75V ≤ VIN ≤ 15V (Note 2) ● 16 mV

OUT

= 0mA, 6.5V ≤ VIN ≤ 15V (Note 2) ● 110 mV

OUT

) = 2V, TJ = 25°C 1.238 1.250 1.262 V

OUT

OUT

) ≤ 10V ● 1.225 1.250 1.270 V

OUT

≤ 15V (Note 2) ● 0.035 0.2 %

2

LT1117/LT1117-2.85

LT1117-3.3/LT1117-5

LECTRICAL C CHARA TERIST

E

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

PARAMETER CONDITIONS MIN TYP MAX UNITS

Load Regulation LT1117 (VIN – V

LT1117-2.85 V
LT1117-3.3 V
LT1117-5 VIN = 6.5V, 0 ≤ I

Dropout Voltage I

Current Limit (VIN – V
Minimum Load Current LT1117 (VIN – V
Quiescent Current LT1117-2.85 VIN ≤ 10V ● 510 mA

LT1117-3.3 V

LT1117-5 VIN ≤ 15V ● 510 mA
Thermal Regulation TA = 25°C, 30ms Pulse 0.01 0.1 %/W
Ripple Rejection f
Adjust Pin Current ● 55 120 µA
Adjust Pin Current Change 10mA ≤ I
Temperature Stability 0.5 %
Long Term Stability TA = 125°C, 1000Hrs 0.3 %
RMS Output Noise (% of V
Thermal Resistance (Junction-to-Case, at Tab) 15 °C/W

ICS

) = 3V, 10mA ≤ I

OUT

= 4.25V, 0 ≤ I

IN

= 4.75V, 0 ≤ I

IN

= 100mA, 0°C ≤ TJ ≤ 125°C (Note 3) 1.00 1.10 V

OUT

= 500mA, 0°C ≤ TJ ≤ 125°C (Note 3) 1.05 1.15 V

I

OUT

I

= 800mA, 0°C ≤ TJ ≤ 125°C (Note 3) 1.10 1.20 V

OUT

I

= 100mA, –40°C ≤ TJ < 0°C (Note 3) 1.00 1.20 V

OUT

= 500mA, –40°C ≤ TJ < 0°C (Note 3) 1.05 1.25 V

I

OUT

I

= 800mA, –40°C ≤ TJ < 0°C (Note 3) 1.10 1.30 V

OUT

) = 5V, TJ = 25°C, 800 950 1200 mA

OUT

) = 15V (Note 4) ● 1.7 5 mA

OUT

≤ 15V ● 510 mA

IN

= 120Hz, (VIN – V

RIPPLE

OUT

), 10Hz ≤ f ≤ 10kHz 0.003 %

OUT

≤ 800mA (Note 2) ● 110 mV

OUT

≤ 800mA (Note 2) ● 110 mV

OUT

≤ 800mA (Note 2) ● 115 mV

OUT

≤ 800mA, 1.4V ≤ (VIN – V

≤ 800mA (Note 2) ● 0.1 0.4 %

OUT

) = 3V, V

OUT

= 1V

RIPPLE

OUT

P-P

) ≤ 10V ● 0.2 5 µA

● 60 75 dB

Note 1: Absolute Maximum Ratings are those values beyond which the life
to the device may be imparied.

Note 2: See thermal regulation specification for changes in output voltage
due to heating effects. Load regulation and line regulation are measured at
a constant junction temperature by low duty cycle pulse testing.

Note 3: Dropout voltage is specified over the full output current range of
the device. Dropout voltage is defined as the minimum input/output
differential measured at the specified output current. Test points and limits
are also shown on the Dropout Voltage curve.

Note 4: Minimum load current is defined as the minimum output current
required to maintain regulation.

UW

LPER

F

O

R

ATYPICA

Minimum Operating Current
(Adjustable Device) Short-Circuit Current Load Regulation

4

3

2

1

MINIMUM OPERATING CURRENT (mA)

0

0

5

INPUT/OUTPUT DIFFERENTIAL (V)

TJ = 125°C

TJ = 25°C

TJ = –55°C

10 15 20

LT1117 • TPC02

CCHARA TERIST

E

C

1.25

1.00

0.75

0.50

0.25

SHORT CIRCUIT CURRENT (A)

0

0

INPUT/OUTPUT DIFFERENTIAL (V)

ICS

0.10

∆ I

LOAD

TJ = 125°C

TJ = 25°C

5

10 15

LT1117 • TPC03

0.05

0

–0.05

–0.10

–0.15

OUTPUT VOLTAGE DEVIATION (%)

–0.20

–50

= 800mA

0

–25 25 100

TEMPERATURE (°C)

50 75 125

LT1117 • TPC04

3

LT1117/LT1117-2.85

TEMPERATURE (°C)

–50

–2.0

OUTPUT VOLTAGE CHANGE (%)

–1.0

0

2.0

0 50 100 150

LT1117 • TPC07

1.0

–25 25 75 125

LT1117-3.3/LT1117-5

UW

LPER

F

O

R

ATYPICA

LT1117 Ripple Rejection LT1117 Ripple Rejection vs Current Temperature Stability

100

90
80
70
60
50
40
30

RIPPLE REJECTION (dB)

20
10

0

10 1k 10k 100k

V

RIPPLE

C

= 200µF AT f < 60Hz

ADJ

= 25µF AT f > 60Hz

C

ADJ

= 0.5A

I

OUT

100

≤ 3V

P-P

(VIN – V

FREQUENCY (Hz)

(VIN – V

OUT)

≥ V

V

RIPPLE

0.5V

P-P

OUT)

DROPOUT

LT1117 • TPC05

≤

≥ 3V

Adjust Pin Current Load Transient Response Load Transient Response

100

90
80
70
60
50
40
30

AJUST PIN CURRENT (µA)

20
10

0

–50

–25 25 75 125

0 50 100 150

TEMPERATURE (°C)

LT1117 • TPC08

CCHARA TERIST

E

C

100

V

= 5V

OUT

90

= 25µF

C

ADJ

= 25µF

C

OUT

80
70
60
50
40
30

RIPPLE REJECTION (dB)

20
10

0

0

0.2 0.4 0.6 0.8

LT1117-2.85 LT1117-5

0.3
CIN = 10µF

= 10µF TANTALUM

C

0.2

OUT

= 4.25V

V

IN

PRELOAD = 0.1A

0.1

0

DEVIATION (V)

OUPUT VOLTAGE

–0.1

–0.2

0.5

0

(A)

–0.5

LOAD CURRENT

0

10 30 60 80

20 50 70 100

ICS

f

RIPPLE

V

≤ 3V

RIPPLE

f

RIPPLE

V

≤ 0.5V

RIPPLE

OUTPUT CURRENT (A)

40 90

TIME (µs)

= 120Hz

P-P

= 20kHz

P-P

LT1117 • TPC06

LT1117 • TPC09

0.3
CIN = 10µF

C

OUT

0.2

= 6.5V

V

IN

PRELOAD = 0.1A

0.1

0

DEVIATION (V)

OUPUT VOLTAGE

–0.1

–0.2

0.5

0

(A)

–0.5

LOAD CURRENT

0

10 30 60 80

= 10µF TANTALUM

20 50 70 100

40 90

TIME (µs)

LT1117 • TPC10

4

LT1117-2.8
Line Transient Response

60

CIN = 1µF

= 10µF TANTALUM

C

OUT

40

= 0.1A

I

OUT

20

0

DEVIATION (mV)

OUPUT VOLTAGE

–20

–40

5.25

4.25

(V)

3.25

INPUT VOLTAGE

0

20 60 120 160

40 100 140 200

80 180

TIME (µs)

LT1117 • TPC11

LT1117-5
Line Transient Response

60

40

20

DEVIATION (mV)

OUPUT VOLTAGE

–20

–40

7.50

6.50

(V)

5.50

INPUT VOLTAGE

CIN = 1µF

= 10µF TANTALUM

C

OUT

= 0.1A

I

OUT

0

0

20 60 120 160

40 100 140 200

80 180

TIME (µs)

LT1117 • TPC12