LINEAR TECHNOLOGY LTC3035 Technical data

FEATURES

■

Wide Input Voltage Range: 1.7V to 5.5V

■

Wide Adjustable Output Voltage Range:

0.4V to 3.6V

■

Built-In Charge Pump Generates High Side Bias

■

Very Low Dropout: 45mV at 300mA

■

±

2% Voltage Accuracy Over Temperature,

Supply, Load

■

Fast Transient Recovery

■

Low Operating Current: I

■

Low Shutdown Current: I

■

Stable with Ceramic Capacitor Down to 1µF

■

Output Current Limit

■

Thermal Overload Protected

■

Reverse Output Current Protected

■

Available in 8-Lead (3mm × 2mm) DFN Package

= 100µA Typ

IN

= 1µA Typ

IN

U

APPLICATIO S

■

Li-Ion to 3.3V Low Dropout Supplies

■

2 × AA to 1.8V Low Dropout Supplies

■

Low Power Handheld Devices

■

Low Voltage Logic Supplies

■

DSP Power Supplies

■

Cellular Phones

■

Portable Electronic Equipment

■

Handheld Medical Instruments

■

Post Regulator for Switching Supply Noise Rejection

LTC3035

300mA VLDO Linear

Regulator with Charge Pump

Bias Generator

U

DESCRIPTIO

The LTC®3035 is a micropower, VLDO™ (very low drop­out) linear regulator which operates from input voltages as
low as 1.7V. The device is capable of supplying 300mA of
output current with a typical dropout voltage of only
45mV. To allow operation at low input voltages the LTC3035
includes a charge pump generator that provides the nec­essary bias voltage for the internal LDO circuitry. Output
current comes directly from the input supply for high
efficiency regulation. The charge pump bias generator
requires only a 0.1µF flying capacitor and a 1µF bypass
capacitor for operation. The low 0.4V internal reference
voltage allows the LTC3035 to be programmed to much
lower output voltages than commonly available in LDOs.
The output voltage is programmed via two tiny SMD
resistors. The LTC3035’s low quiescent current makes it
an ideal choice for use in battery-powered systems.

Other features include high output voltage accuracy, ex­cellent transient response, stability with ultralow ESR
ceramic capacitors as small as 1µF, short-circuit and
thermal overload protection, output current limiting and
reverse output current protection. The LTC3035 is avail­able in a tiny, low profile (3mm × 2mm × 0.75mm) 8-lead
DFN package.

, LTC and LT are registered trademarks of Linear Technology Corporation.
VLDO is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6411531, others pending.

TYPICAL APPLICATIO

3.3V Output Voltage from Li-Ion Battery

0.1µF

CM

CP

BIAS

GENERATOR

Li-Ion

BATTERY

3.4V TO 4.2V

OFF ON

1µF

IN

0.4V

SHDN

+
–

LTC3035

GND

BIAS

OUT

ADJ

U

C

BIAS

1µF

294k

40.2k

3035 TA01a

C
1µF

OUT

V

OUT

3.3V
300mA

Dropout Voltage vs Load Current

70

TA = 25°C

60

50

40

30

20

DROPOUT VOLTAGE (mV)

10

0

0

50 100

200 300

150 250

I

(mA)

OUT

3035 TA01b

3035f

1

LTC3035

WW

W

ABSOLUTE AXI U RATI GS

U

UUW

PACKAGE/ORDER I FOR ATIO

(Notes 1, 2)

CM

GND

IN

TOP VIEW

1CP

2

3

4

8

BIAS

SHDN

7

9

ADJ

6

OUT

5

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

SHDN to GND ............................................. –0.3V to 6V

CP, CM, BIAS to GND ................................. –0.3V to 6V

ADJ to GND ................................................ – 0.3V to 6V

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

V

OUT

Operating Junction Temperature

(Note 3) ........................................... – 40°C to 125°C

8-LEAD (3mm × 2mm) PLASTIC DFN

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

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

EXPOSED PAD (PIN 9) IS GND,MUST BE SOLDERED TO PCB

ORDER PART NUMBER

LTC3035EDDB

Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

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

ELECTRICAL CHARACTERISTICS

range, otherwise specifications are at T
capacitors ceramic) unless otherwise noted.

PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Operating Voltage (Note 4)
V

Output Voltage Range 2.63V < VIN < 5.5V

BIAS

V

Output Voltage Range

OUT

VIN Operating Current I
VIN Shutdown Current V
V

Regulation Voltage (Note 5) 1mA < I

ADJ

I

ADJ Input Current V

ADJ

OUT Load Regulation (Referred to ADJ Pin) I
Dropout Voltage (Note 6) VIN = 1.7V, V
I

Continuous Output Current

OUT

I

Short Circuit Output Current V

OUT

V

Output Noise Voltage F = 10Hz to 100kHz, I

OUT

VIH SHDN Input High Voltage
VIL SHDN Input Low Voltage
IIH SHDN Input High Current SHDN = V
IIL SHDN Input Low Current SHDN = 0V –1 1 µA

= 25°C. VIN = 3.6V, V

A

1.7V

OUT

SHDN

V

OUT

ADJ

OUT

ADJ

The ● denotes specifications which apply over the full specified temperature

= 3.3V, C

OUT

< VIN < 2.63V

= 10µA

= 0V 1 5 µA

< 300mA, 1.7V < VIN < 5.5V,

OUT

= 1.5V
= 0.4V
= 1mA to 300mA –0.2 mV

= 0.37V, I

ADJ

= V

= 0 760 mA

OUT

OUT

IN

= 0.1µF, C

FLY

= 300mA

OUT

= 150mA 150 µVrms

DDB PACKAGE

T

= 125°C, θJA = 76°C/W

JMAX

DDB PART MARKING

LBRM

= 1µF, CIN = 1µF, C

OUT

●

1.7 5.5 V

●

4.8 5 5.3 V

●

1.85 • VIN 1.90 • VIN 1.95 • V

●

V

ADJ

●

●

0.392 0.4 0.408 V

●

–50 0 50 nA

●

●

300 mA

●

1.1 V

●

–1 1 µA

100 200 µA

= 1µF (all

BIAS

45 100 mV

IN

3.6 V

0.3 V

V

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

Note 2: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.

2

Note 3: The LTC3035 regulator is tested and specified under pulse load
conditions such that T
25°C. Performance at –40°C and 125°C is assured by design,
characterization and correlation with statistical process control.

Note 4: Min Operating Input Voltage required for regulation is:

> V

V

IN

OUT

≈ TA. The LTC3035 is 100% production tested at

J

+ V

DROPOUT

and VIN > 1.7V

3035f

ELECTRICAL CHARACTERISTICS

LTC3035

Note 5: Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply for
all possible combinations of input voltage and output current. When

Note 6: Dropout voltage is minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout, the

output voltage will be equal to V
operating at maximum input voltage, the output current range must
be limited.

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Dropout Voltage vs Load Current

70

60

50

40

30

20

DROPOUT VOLTAGE (mV)

10

0

0

50 100

TA = 25°C

I

OUT

TA = 125°C

TA = –40°C

200 300

150 250

(mA)

3035 G01

VIN Shutdown Current VIN No Load Operating Current

5.0

4.5

4.0

3.5

3.0

2.5

(µA)

IN

I

2.0

1.5

1.0

0.5

0

0

1

TA = 85°C

TA = –40°C

2

TA = 25°C

34

VIN (V)

5

LT1108 • TPC12

– V

IN

115

V

OUT

110

105

100

(µA)

IN

I

95

90

85

6

80

3

DROPOUT

= 3.3V

3.5 4

.

TA = 125°C

TA = 85°C

TA = 25°C

TA = –40°C

4.5 5.5

VIN (V)

56

3035 G03

VIN No Load Operating Current

120

V

= 1.5V

OUT

110

100

90

(µA)

IN

I

80

70

60

0

TA = 125°C

234

1

VIN (V)

TA = 25°C

TA = –40°C

TA = 85°C

56

3035 G04

404

V

= 3.3V

OUT

403

402

401

400

399

ADJUST VOLTAGE (mV)

398

397

396

–25 15

–45

–5

TEMPERATURE (°C)

ADJ Voltage vs Input VoltageADJ Voltage vs Temperature

404

V

= 1.5V

OUT

403

402

401

400

399

ADJ VOLTAGE (mV)

398

397

95

55

35

115

75

3035 G05

396

0

VIN (V)

5

4

3035 G06

3035f

36

2

1

3

LTC3035

UW

TYPICAL PERFOR A CE CHARACTERISTICS

BIAS Voltage vs Input Voltage

6

5

4

3

2

BIAS VOLTAGE (V)

1

0

0

1

2.5 3.5 4.5 5.5 6

234

1.5
VIN (V)

Current Limit vs Input Voltage

900

V

OUT

800

700

600

500

400

300

CURRENT LIMIT (mA)

200

100

0

1.5

= 0V

2

SHDN Threshold (Rising)
vs Temperature

1000

900

800

700

600

SHDN THRESHOLD (mV)

500

50.5

3035 G07

400

–45

VIN = 1.7V

5

–20

TEMPERATURE (°C)

VIN = 3.6V

VIN = 5.5V

55

30

80

105 130

3035 G08

SHDN Threshold (Falling)
vs Temperature

1000

900

800

700

600

SHDN THRESHOLD (mV)

500

400

–45

VIN = 3.6V

5

–20

TEMPERATURE (°C)

VIN = 1.7V

30

VIN = 5.5V

55

80

105 130

3035 G09

VIN Ripple Rejection vs Frequency

70

60

C

= 10µF

OUT

C

= 1µF

OUT

1M

3035 G13

3

3.5

VIN (V)

50

40

30

REJECTION (dB)

20

VIN = 3.6V

10

= 3.3V

V

OUT

= 100mA

I

OUT

0

42.5

4.5

5.55

3035 G10

1k 10k 100k 10M

100

FREQUENCY (Hz)

4

20mV/DIV

300mA

I

OUT

Transient Response

V

OUT

AC

10mA

= 3.6V

IN

= 3.3V

V

OUT

= 1µF

C

OUT

BIAS Output Ripple

V

BIAS

50mV/DIV

AC

V

OUT

5mV/DIV

AC

200µs/DIVV

3035 G11

V
C
C
C
I

OUT

= 3.6V

IN
OUT
BST
FLY
OUT

= 3.3V

500µs/DIVV

= 1µF

= 0.1µF

= 1µF

= 1mA

3035 G12

3035f