LINEAR TECHNOLOGY LTC3200, LTC3200-5 Technical data

FEATURES

LTC3200/LTC3200-5

Low Noise, Regulated

Charge Pump DC/DC Converters

U

DESCRIPTIO

■

Low Noise Constant Frequency Operation

■

Output Current: 100mA

■

Available in 8-Pin MSOP (LTC3200) and Low
Profile (1mm) 6-Pin ThinSOTTM (LTC3200-5)
Packages

■

2MHz Switching Frequency

■

Fixed 5V ± 4% Output (LTC3200-5) or ADJ

■

VIN Range: 2.7V to 4.5V

■

Automatic Soft-Start Reduces Inrush Current

■

No Inductors

■

ICC <1µA in Shutdown

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APPLICATIO S

■

White LED Backlighting

■

Li-Ion Battery Backup Supplies

■

Local 3V to 5V Conversion

■

Smart Card Readers

■

PCMCIA Local 5V Supplies

The LTC®3200/LTC3200-5 are low noise, constant fre­quency switched capacitor voltage doublers. They pro­duce a regulated output voltage from a 2.7V to 4.5V input
with up to 100mA of output current. Low external parts
count (one flying capacitor and two small bypass capaci­tors at VIN and V

) make the LTC3200/LTC3200-5

OUT

ideally suited for small, battery-powered applications.
A new charge-pump architecture maintains constant

switching frequency to zero load and reduces both output
and input ripple. The LTC3200/LTC3200-5 have thermal
shutdown capability and can survive a continuous short­circuit from V

to GND. Built-in soft-start circuitry

OUT

prevents excessive inrush current during start-up.
High switching frequency enables the use of small ceramic

capacitors. A low current shutdown feature disconnects
the load from VIN and reduces quiescent current to <1µA.

The LTC3200 is available in an 8-pin MSOP package and
the LTC3200-5 is available in a 6-pin ThinSOT.

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

ThinSOT is a trademark of Linear Technology Corporation.

TYPICAL APPLICATIO

Regulated 5V Output from a 2.7V to 4.5V Input

1µF

4

+

–

C

C

ON

LTC3200-5

5

V

2

GND

3

SHDN

V

OUT

IN

V

2.7V TO 4.5V

IN

1µF

OFF

ALL CAPACITORS = MURATA GRM 39X5R105K6.3AJ
OR TAIYO YUDEN JMK107BJ105MA

U

Output Ripple Voltage vs Load Current

40

VIN = 3V
C

= 1µF

FLY

T

= 25°C

A

)

30

6

1

1µF

5V ±4%

V

OUT =

UP TO 40mA, VIN ≥ 2.7V

I

OUT

UP TO 100mA, VIN ≥ 3.1V

I

OUT

3200-5 TA01

P-P

20

OUTPUT RIPPLE (mV

10

0

0

25

OUTPUT CURRENT (mA)

C

= 1µF

OUT

C

= 2.2µF

OUT

50

75

100

3200 TA02

1

LTC3200/LTC3200-5

WW

W

ABSOLUTE AXI U RATI GS

U

(Note 1)

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

V

to GND .............................................– 0.3V to 5.5V

OUT

VFB, SHDN to GND........................ – 0.3V to (VIN + 0.3V)

I

(Note 2)....................................................... 150mA

OUT

UUW

PACKAGE/ORDER I FOR ATIO

ORDER PART

TOP VIEW

+

C

1
2

V

IN

–

3

C

4

PGND

MS8 PACKAGE

8-LEAD PLASTIC MSOP

T

= 150°C, θJA = 200°C/W

JMAX

Consult factory for parts specified with wider operating temperature ranges.

8
7
6
5

V

OUT

FB
SHDN
SGND

NUMBER

LTC3200EMS8

MS8 PART MARKING

LTNV

V

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

OUT

Operating Temperature Range (Note 3) .. –40°C to 85°C

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

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

ORDER PART

TOP VIEW

V

1

OUT

GND 2

SHDN 3

S6 PACKAGE

6-LEAD PLASTIC SOT-23

T

= 150°C, θJA = 230°C/W

JMAX

6 C
5 V
4 C

+

IN

–

NUMBER

LTC3200ES6-5

S6 PART MARKING

LTSH

ELECTRICAL CHARACTERISTICS

temperature range. Specifications are at TA = 25°C, VIN = 3.6V, C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

IN

V

OUT

I

CC

I

SHDN

V

FB

I

FB

V

R

η Efficiency (LTC3200-5) VIN = 3V, I
F

OSC

V

IH

V

IL

I

IH

I

IL

t

ON

R

OL

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

Note 2: Based on long term current density limitations.

Input Voltage ● 2.7 4.5 V
Output Voltage 2.7V ≤ VIN ≤ 4.5V, I

Operating Supply Current I
Shutdown Current SHDN = 0V, V
FB Voltage (LTC3200) ● 1.217 1.268 1.319 V
FB Input Current (LTC3200) VFB = 1.4V ● –50 50 nA
Output Ripple (LTC3200-5) VIN = 3V, I

Switching Frequency 1 2 MHz
SHDN Input Threshold ● 1.3 V
SHDN Input Threshold ● 0.4 V
SHDN Input Current SHDN = V
SHDN Input Current SHDN = 0V ● –1 1 µA
V

Turn-On Time VIN = 3V, I

OUT

Open-Loop Output Resistance VIN = 3V, I

The ● denotes specifications which apply over the full operating

FLY

3.1V ≤ V

OUT

≤ 4.5V, I

IN

= 0mA, SHDN = V

OUT

OUT

IN

OUT

OUT

= 1µF, CIN = 1µF, C

≤ 40mA ● 4.8 5 5.2 V

OUT

≤ 100mA ● 4.8 5 5.2 V

OUT

IN

= 0V ● 1 µA

OUT

= 100mA 30 mV
= 50mA 80 %

= 0mA, 10% to 90% 0.8 ms
= 100mA, VFB = 0V (Note 4) 9.2 Ω

Note 3: The LTC3200E/LTC3200E-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.

Note 4: R

≡ (2 VIN – V

OL

= 1µF unless otherwise noted.

OUT

● 3.5 8 mA

● –1 1 µA

)/I

OUT

OUT

P-P

2

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Output Voltage vs Supply Voltage Output Voltage vs Load Current

5.15
CIN = C

I

5.10

5.05

5.00

4.95

OUTPUT VOLTAGE (V)

4.90

OUT

= 20mA

OUT

TA = –40°C

= C

= 1µF

FLY

TA = 25°C

TA = 85°C

5.2
CIN = C
T

5.1

5.0

VIN = 2.7V

OUTPUT VOLTAGE (V)

4.9

= 25°C

A

OUT

= C

= 1µF

FLY

VIN = 3V

VIN = 3.2V

LTC3200/LTC3200-5

(LTC3200-5)

No Load Supply Current vs Supply
Voltage

6

CIN = C
V

5

4

SUPPLY CURRENT (mA)

SHDN

OUT

= V

= C

FLY

IN

TA = 85°C

= 1µF

TA = 25°C

TA = –40°C

4.85

2.7

3.3 3.6 3.9

3.0
SUPPLY VOLTAGE (V)

Oscillator Frequency vs Supply
Voltage

3.0

2.8

2.6

2.4

2.2

2.0

1.8

1.6

1.4

OSCILLATOR FREQUENCY (MHz)

1.2

1.0

2.7 3.0 3.3 3.6 3.9

TA = –40°C

SUPPLY VOLTAGE (V)

TA = 25°C

TA = 85°C

4.2 4.5

3200 F01

3200 G04

4.8
0

V

50

Threshold Voltage vs

SHDN

100

LOAD CURRENT (mA)

150

200

3200 G02

Supply Voltage

1.1

1.0

0.9

0.8

0.7

THRESHOLD VOLTAGE (V)

0.6

4.54.2

0.5

TA = –40°C

TA = 25°C

2.7 3.0 3.3 3.6 3.9
SUPPLY VOLTAGE (V)

TA = 85°C

4.54.2

3200 G05

3

3.0 3.3 3.6 3.9

2.7
SUPPLY VOLTAGE (V)

Efficiency vs Load Current

100

CIN = C
T

90

80

70

60

EFFICIENCY (%)

50

40

30

1 10 100

= 25°C

A

OUT

= C

= 1µF

FLY

VIN = 2.7V

LOAD CURRENT (mA)

VIN = 3.2V

VIN = 3.7V

4.54.2

3200 G03

VIN = 4.5V

3200 G06

Short Circuit Current vs Supply
Voltage

250

C

= 1µF

FLY

= 25°C

T

A

= 0V

V

OUT

200

150

OUTPUT CURRENT (mA)

100

2.7

3.0 3.3 3.6 3.9
SUPPLY VOLTAGE (V)

4.54.2

3200 G07

3

LTC3200/LTC3200-5

I

L

10mA TO

90mA

50mA/DIV

V

OUT

(AC

COUPLED)

50mV/DIV

10µs/DIVV

IN

= 3.3V

C

OUT

= 1µF

32005 G10

UW

TYPICAL PERFOR A CE CHARACTERISTICS

(LTC3200-5) TA = 25°C

V

Soft-Start Ramp Output Ripple

OUT

V

(AC

OUT

V

SHDN

2V/DIV

V

OUT

1V/DIV

IN

= 3V

200µs/DIVV

32005 G08

COUPLED)

20mV/DIV

C

OUT

C

= 3.3µF

OUT

C

OUT

= 1µF

= 10µF

= 3.3V

IN

= 100mA

I

L

UUU

PIN FUNCTIONS

C+ (Pins 1/6): Flying Capacitor Positive Terminal.
VIN (Pins 2/5): Input Supply Voltage. VIN should be

bypassed with a 1µF to 4.7µF low ESR ceramic capacitor.

C– (Pins 3/4): Flying Capacitor Negative Terminal.
GND (Pins 4,5/2): Ground. Should be tied to a ground

plane for best performance.

LTC3200/LTC3200-5

Load Transient Response

200ns/DIVV

32005 G09

FB (Pin 7): (LTC3200 Only) Feedback Input Pin. An output
divider should be connected from V

to FB to program

OUT

the output voltage.

V

(Pins 8/1): Regulated Output Voltage. V

OUT

OUT

should

be bypassed with a 1µF to 4.7µF low ESR ceramic capaci-
tor as close as possible to the pin for best performance.

SHDN (Pins 6/3): Active Low Shutdown Input. A low on
SHDN disables the LTC3200/LTC3200-5. SHDN must not
be allowed to float.

4