LINEAR TECHNOLOGY LT1303-5 Technical data

FEATURES

■

5V at 200mA from a 2V Input

■

Supply Voltage As Low As 1.8V

■

Up to 88% Efficiency

■

120µA Quiescent Current

■

Low-Battery Detector

■

Low V

■

Uses Inexpensive Surface Mount Inductors

■

8-Lead PDIP or SO Package

Switch: 170mV at 1A Typ

CESAT

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APPLICATIONS

■

EL Panel Drivers

■

2-Cell and 3-Cell to 5V Conversion

■

Palmtop Computers

■

Portable Instruments

■

Bar-Code Scanners

■

PDAs

■

Wireless Systems

LT1303/LT1303-5

Micropower High Efficiency

DC/DC Converters with

Low-Battery Detector

Adjustable and Fixed 5V

U

DESCRIPTION

The LT®1303/LT1303-5 are micropower step-up high
efficiency DC/DC converters using Burst ModeTM opera­tion. They are ideal for use in small, low-voltage battery­operated systems. The LT1303-5 accepts an input voltage
between 1.8V and 5V and converts it to a regulated 5V. The
LT1303 is an adjustable version that can supply an output
voltage up to 25V. Quiescent current is only 120µA from
the battery and the shutdown pin further reduces current
to 10µA. The low-battery detector provides an open-
collector output that goes low when the input voltage
drops below a preset level. The on-chip NPN power switch
has a low 170mV saturation voltage at a switch current
of 1A. The LT1303/LT1303-5 are available in 8-lead PDIP
or SO packages, easing board space requirements.

For higher output current, please see the LT1305 or
LT1302.

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

Burst Mode is a trademark of Linear Technology Corporation.

U

TYPICAL APPLICATION

L1

22µH

316k

+

2 CELLS

L1 = SUMDIA CD54-220

100µF

1%

412k
1%

SHUTDOWN

V

IN

LT1303-5

GND PGND

Figure 1. 2-Cell to 5V DC/DC Converter with Low-Battery Detect

1N5817

SW

SENSELBI

LBOSHDN

100µF

100k

+

, 5V

V

OUT

200mA

LOW BATTERY
GOES LOW AT 

= 2.2V

V

BAT

LT1303 TA02

90

80

70

60

EFFICIENCY (%)

50

40

30

0.1

5V Output Efficiency



VIN = 4V

VIN = 2.5V

VIN = 3V

1 10010 1000

LOAD CURRENT (mA)

VIN = 2V

LT1303 TA01

1

LT1303/LT1303-5

WW

W

ABSOLUTE MAXIMUM RATINGS

V

Voltage .............................................................. 10V

IN

SW1 Voltage ............................................................ 25V

Sense Voltage (LT1303-5) ....................................... 20V

FB Voltage (LT1303)................................................ 10V

Shutdown Voltage ................................................... 10V

LBO Voltage............................................................. 10V

LBI Voltage .............................................................. 10V

Maximum Power Dissipation ............................. 500mW

Operating Temperature Range ..................... 0°C to 70°C

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

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

LECTRICAL C CHARA TERIST

E

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

I

Q

VINInput Voltage Range 1.8 1.55 V

DC Maximum Duty Cycle ● 75 86 95 %
t

ON

V

CESAT

V

SHDNH

V

SHDNL

I

SHDN

The
temperature range.

Quiescent Current V

Feedback Voltage LT1303 ● 1.22 1.24 1.26 V
Output Sense Voltage LT1303-5 ● 4.8 5.0 5.2 V
Comparator Hysteresis LT1303 (Note 1) ● 6 12.5 mV
Output Hysteresis LT1303-5 (Note 1) ● 22 50 mV
Feedback Pin Bias Current LT1303, VFB = 1V ● 720 nA
Oscillator Frequency Current Limit Not Asserted 120 155 185 kHz
Oscillator TC 0.2 %/°C

Switch On Time Current Limit Not Asserted 5.6 µs
Output Line Regulation 1.8V < VIN < 6V ● 0.06 0.15 %/V
Switch Saturation Voltage ISW = 700mA ● 130 200 mV
Switch Leakage Current VSW = 5V, Switch Off ● 0.1 10 µA
Peak Switch Current VIN = 2V ● 0.75 1.0 1.25 A

LBI Trip Voltage ● 1.21 1.24 1.27 V
LBI Input Bias Current V
LBO Output Low I
LBO Leakage Current V
Shutdown Pin High ● 1.8 V
Shutdown Pin Low 0.5 V
Shutdown Pin Bias Current V

● denotes specifications which apply over the 0°C to 70°C operating

SHDN

V

SHDN

VIN = 5V 0.65 0.9 1.15 A

LBI

LOAD

LBI

SHDN

V

SHDN

V

SHDN

U

U

W

PACKAGE/ORDER INFORMATION

TOP VIEW

GND

1

LBO

2

SHDN

3

FB (SENSE)*

Consult factory for Industrial and Military grade parts.

ICS

TA = 25°C, VIN = 2.0V, unless otherwise noted.

= 0.5V, V
= 1.8V ● 715 µA

= 1V ● 720 nA

= 100µA ● 0.11 0.4 V

= 1.3V, V

= 5V ● 8.0 20 µA
= 2V ● 3.0 µA
= 0V ● 0.1 1 µA

= 5V, V

SEL

= 5V ● 0.1 5 µA

LBO

= 5.5V ● 120 200 µA

SENSE

Note 1: Hysteresis specified is DC. Output ripple may be higher if output
capacitance is insufficient or capacitor ESR is excessive.

4

N8 PACKAGE
8-LEAD PDIP

S8 PACKAGE

8-LEAD PLASTIC SO

*FIXED VERSION

= 100°C, θJA = 130°C/W (N8)

T

JMAX

= 100°C, θJA = 150°C/W (S8)

T

JMAX

PGND

8

SW

7



V

6

IN

LBI

5



● 2.0 V

ORDER PART

NUMBER

LT1303CN8
LT1303CS8
LT1303CN8-5
LT1303CS8-5

S8 PART MARKING

1303
13035

U

2

W

TEMPERATURE (˚C)

–50



700

800

900

25 75

LT1303 GO3

600

500

–25 0

50 100

400

300

RESISTANCE (kΩ)

1000

TEMPERATURE (°C)

–50

1.200

LBI VOLTAGE (V)

1.210

1.215

1.220

1.225

1.230

1.235

–25

0

25 50

LT1303 G06



75

1.240

1.245

1.250

1.205

100

TEMPERATURE (°C)

–50 –25 25 75

0.60

SWITCH CURRENT (A)

0.70

0.90

1.00

1.10

50

1.50

LT1303 G09

0.80

0 100

1.20

1.30

1.40

VIN = 2V

U

TYPICAL PERFORMANCE CHARACTERISTICS

LT1303/LT1303-5

V

vs Switch Current

CESAT

250
225
200
175

150

(mV)

125

CESAT

100

V

75
50
25

0

0.21.0 0.3 0.5 0.7 0.9

0.1
SWITCH CURRENT (A)

LT1303 FB Voltage

1.250

1.245

1.240

1.235

1.230

1.225

1.220

1.215

FEEDBACK VOLTAGE (V)

1.210

1.205

1.200
–50

–25

TEMPERATURE (°C)

0

0.4

0.6

25 50

0.8

LT1303 G01

75

LT1330 G04

1.0

100

V

vs Temperature

CESAT

200

ISW = 700mA

190
180
170

160

(mV)

150

CESAT

140

V

130
120
110
100

–50

–25

5.10

5.08

5.06

5.04

5.02

5.00

4.98

SENSE VOLTAGE (V)

4.96

4.94

4.92

4.90
–50

–25

25 50

0

TEMPERATURE (°C)

25 50

0

TEMPERATURE (°C)

75

LT1303 G02

75

LT1303 G05

LT1303-5 Sense Pin Resistance
to Ground

100

Low Battery Detect Trip PointLT1303-5 Sense Voltage

100

LBI Pin Bias Current

20
18
16
14

12
10

8

BIAS CURRENT (nA)

6
4
2
0

–50

–25

25 50

0

TEMPERATURE (°C)

75

LT1303 G07

100

FB Pin Bias Current

20
18
16
14

12
10

8

BIAS CURRENT (nA)

6
4
2
0

–50

–25

25 50

0

TEMPERATURE (°C)

75

LT1303 G08

100

Switch Current Limit

3

LT1303/LT1303-5

W

U

TYPICAL PERFORMANCE CHARACTERISTICS

Switch On-Time Maximum Duty Cycle

8

7

6

5

ON-TIME (µs)

4

3

2

–50

02550

–25

TEMPERATURE (°C)

75 100

LT1303 G10

Oscillator Frequency

200

190
180
170

160

150
140

FREQUENCY (kHz)

130

120

110
100

–50

–25

TEMPERATURE (°C)

0

25 50

75

LT1303 G11

100

100

95
90
85

80
75
70

DUTY CYCLE (%)

65
60
55
50

–50

–25

TEMPERATURE (°C)

Quiescent Current Quiescent Current Switch Current Limit

200
190
180
170

160
150
140
130

QUIESCENT CURRENT (µA)

120

110

100

SWITCH OFF
V

IN

–50

= 2V

–25

TEMPERATURE (°C)

0

25 50

75

LT1303 G13

100

QUIESCENT CURRENT (µA)

500

400

300

200

100

0

TA = 25°C
SWITCH OFF

0

2

4

INPUT VOLTAGE (V)

6

8

10

LT1303 G14

1200

L = 33µH

= 3V

V

L

1100

1000

900

SWITCH CURRENT (mA)

800

700

2

0

INPUT VOLTAGE (V)

0

25 50

4

100

75

LT1303 G12

6

8

10

LT1303 G15

V

OUT

100mV/DIV

AC COUPLED

200mA

I

LOAD

0mA

4

Transient Response
Figure 1 Circuit

VIN = 2V
V

= 5V

OUT

200µs/DIV

LT1303 G16

Shutdown Pin Response

5V

V

OUT

1V/DIV

V

SHDN

5V/DIV

R

= 100Ω

LOAD

V

= 2V

IN

V

= 5V

OUT

= 100µF

C

OUT

500µs/DIV

LT1303 G17

Low Battery Detector Transient
Response

V

LBO

2V/DIV

+10mV

V

TRIP

V

LBI

V

–10mV

TRIP

R

PULL-UP

= 47k

5µs/DIV

LT1303 G18

UUU

PIN FUNCTIONS

LT1303/LT1303-5

GND (Pin 1): Signal Ground. Tie to PGND under the
package.

LBO (Pin 2): Open-Collector Output of Low-Battery Com­parator. Can sink 100µA. Disabled when device is in
shutdown.

SHDN (Pin 3): Shutdown. Pull high to shut down the
device. Ground for normal operation.

FB/Sense (Pin 4):

On 1303 (adjustable) this pin connects
to the main comparator C1 input. On LT1303-5 this pin
connects to the resistor string that sets output voltage
at 5V.

W

BLOCK

IDAGRA

V

IN

S

V

C1 C2

IN

6 7

LBI (Pin 5): Low-Battery Comparator Input. When voltage
on this pin below 1.24V, LBO is low.

VIN (Pin 6): Supply Pin. Must be bypassed with a large
value electrolytic to ground. Keep bypass within 0.2" of the
device.

SW (Pin 7): Switch Pin. Connect inductor and diode here.
Keep layout short and direct to minimize radio frequency
interference.

PGND (Pin 8): Power ground. Tie to signal ground (pin1)
under the package. Bypass capacitor from VIN should be
tied directly to PGND within 0.2" of the device.

SW

D1

++

L1

CURRENT 

COMPARATOR

R1

FB

4

R2

REFERENCE

1.24V

HYSTERETIC

COMPARATOR

–

C1

+

OFF

OSCILLATOR

A3

DRIVER

18mV

+

C2

–

R1
3Ω

Q2
1×

Q1
160×

–

C3

+

LBOLBIGND

1

25

SHUTDOWN

3

PGND

8

LT1303 BD01

Figure 2. LT1303 Block Digram

5

LT1303/LT1303-5

BLOCK

IDAGRA

W
S

U

OPERATION

FB SW

4

R1
474k

R2
156k

V

IN

6 7

18mV

+

C2

–

HYSTERETIC

COMPARATOR

CURRENT 

COMPARATOR

OFF

–

A3

DRIVER

REFERENCE

1.24V

C1

OSCILLATOR

+

R1
3Ω

Q2
1×

–

C3

+

LBOLBIGND

1

25

SHUTDOWN

3

Figure 3. LT1303-5 Block Diagram

Q1
160×

8

PGND

LT1303 BD02

Operation of the LT1303 is best understood by referring to
the Block Diagram in Figure 2. When C1’s negative input,
related to the output voltage by the appropriate resistor­divider ratio, is higher than the 1.24V reference voltage,
C1’s output is low. C2, A3 and the oscillator are turned off,
drawing no current. Only the reference and C1 consume
current, typically 140µA. When C1’s negative input drops
below 1.24V and overcomes C1’s 6mV hysteresis, C1’s
output goes high, enabling the oscillator, current compara­tor C2 and driver A3. Quiescent current increases to 2mA
as the device goes into active switching mode. Q1 then
turns on in controlled saturation for nominally 6µ s or until
current comparator C2 trips, whichever comes first. The
switch then turns off for approximately 1.5µ s, then turns on
again. The LT1303’s switching causes current to alter­nately build up in L1 and dump into output capacitor C4 via
D1, increasing the output voltage. When the output is high
enough to cause C1’s output to go high, switching action
ceases. Capacitor C4 is left to supply current to the load
until V

decreases enough to force C1’s output high, and

OUT

the entire cycle repeats. Figure 4 details relevant wave­forms. C1’s cycling causes low-to-mid-frequency ripple
voltage on the output. Ripple can be reduced by making the

output capacitor large. The 100µ F unit specified results in
ripple of 50mV to 100mV on the 5V output. A 220µF
capacitor will decrease ripple by approximately 50%.

V

OUT

100mV/DIV

AC COUPLED

V

SW

5V/DIV

I

L

1A/DIV

20µs/DIV

LT1303 F04

Figure 4. Burst Mode Operation in Action

If switch current reaches 1A, causing C2 to trip, switch on­time is reduced and off-time increases slightly. This allows
continuous operation during bursts. C2 monitors the
voltage across 3Ω resistor R1 which is directly related to
the switch current. Q2’s collector current is set by the
emitter-area ratio to 0.6% of Q1’s collector current. When
R1’s voltage drop exceeds 18mV, corresponding to 1A
switch current, C2’s output goes high, truncating the on­time portion of the oscillator cycle and increasing off-time

6

U

OPERATION

LT1303/LT1303-5

to about 2µs. Response time of C2, which determines
minimum on-time, is approximately 300ns.

Low Battery Detector

The low battery detector is enabled when SHDN is low and
disabled when SHDN is high. The comparator has no

V

BAT



R1

1.24V

LT1303

–

+

R2

49.9k
1%

R1 = (V
HYSTERESIS ≈ 30mV

–1.24V) (43.5k)

TRIP

2M

R3

Figure 5. R3 Adds Hysteresis to Low-Battery Detector

U

WUU

5V

LT1303 F05

R4
47k

APPLICATIONS INFORMATION

hysteresis built in, but hysteresis can be added by
connecting a high-value resistor from LBI to LBO as
shown in Figure 5. The internal reference can be accessed
via the comparator as shown in Figure 6.

V

IN

100k

2N3906

V

REF

OUTPUT

= 1.24V 1 + 

V

REF

VIN ≥ V

REF

R1 + R2 ≈ 33k

R2

+

2.2µF

R2

()

R1

+ 200mV

Figure 6. Accessing Internal Reference

V

IN

LBO

LT1303

LBI

GND

R1

LT1303 F06

Inductor Section

Inductors suitable for use with the LT1303 usually fall in
the 5µH to 50µH range. The inductor must: (1) handle
current of 1.25A without saturating, (2) have enough
inductance to provide a di/dt lower than 400mA/µs, and
(3) have low enough DC resistance to avoid excessive
heating or efficiency losses. Higher value inductors will
deliver more power but tend to be physically larger. Most
ferrite core drum or rod inductors such as those specified
in Table 1 are suitable for use. It is acceptable to bias open­flux inductors (e.g. Sumida CD54) into saturation by 10 to
20% without adverse effects.

Table 1. Recommended Inductors

PHONE

VENDOR SERIES APPROPRIATE VALUES NUMBERS

Coilcraft D03316 10µH to 47µH [phone]

D01608 10µH

Coiltronics OCTAPAK [phone]

CTX20-1 20µH
CTX20-2 20µH

CTX33-4 33µH
Sumida CD54 10µH to 33µH [phone]
Gowanda GA10 10µH to 33µH [phone]

Figure 7 shows inductor current of a suitable inductor,
di/dt is controlled at all times. The rapid rise in current
shown in Figure 8 results from this inductor saturating at
approximately 1A. Saturation occurs when the inductor
cannot hold any more magnetic energy in the core. Current
then increases rapidly, limited only by the resistance of the
winding. Figure 9’s inductor has high DC resistance which
results in the exponential time constant shape of the
inductor current.

I

L

500mA/DIV

5µs/DIV

Figure 7. Properly Chosen Inductor Does Not Saturate

LT1303 F07

7

LT1303/LT1303-5

U

WUU

APPLICATIONS INFORMATION

LT1303 F08

Figure 8. This Inductor Saturates at IL≈1A. A Poor Choice

LT1303 F09

Figure 9. Slight Exponential Shape to Inductor Current
Waveform Indicates Excessive DC Resistance

Capacitor Selection

Input and output capacitors should have low ESR for best
efficiency. Recommended capacitors include AVX TPS
series, Sprague 595D series, and Sanyo OS-CON. The
output capacitor’s ESR determines the high frequency
ripple amplitude. A 100µF capacitor is the minimum rec-
ommended for a 5V output. Higher output voltages can use
lower capacitance values. For example, a 12V output can
use a 33µF or 47µF capacitor. The V

pin of the LT1303

IN

should be decoupled with a 47µ F or 100µ F capacitor at the
pin. When driving a transformer, an additional decoupling
network of 10Ω and 0.1µF ceramic is recommended as
shown in Figure 10.

V

IN

10Ω

+

47µF

0.1µF
CERAMIC

V

IN

LT1303

SW

• • •

Diode Selection

The LT1303’s high switching speed demands a high speed
rectifier. Schottky diodes are preferred for their low for­ward drop and fast recovery. Suitable choices include the
1N5817, MBRS120LT3, and MBR0520LT1. Do not use
signal diodes such as 1N4148. They cannot carry 1A
current. Also avoid “general-purpose” diodes such as
1N4001. These are far too slow and are unsuitable for any
switching regulator application. For high temperature
applications a silicon diode such as the MUR105 will have
less leakage.

GND PGND

LT1303 F10

Figure 10. 10Ω-1µF Network to LT1303 VIN Pin Provides
Additional Decoupling. Recommended When Driving
Transformers.

Table 2. Recommended Capacitors

PHONE

VENDOR SERIES TYPE NUMBERS

AVX TPS Surface Mount [phone]
Sanyo OS-CON Through-Hole [phone]
Panasonic HFQ Through-Hole [phone]
Sprague 595D Surface Mount [phone]

8

U

TYPICAL APPLICATIONS

LT1303/LT1303-5

Setting Output Voltage on LT1303

INPUT

1.8V TO 4.5V

V

OUTPUT

REF

1.24V

V

IN

+

100µF

V

= 1.24V 1 +

OUT

L1

V

IN

R2

()

R1

SW

LT1303

PGNDGND

1N5817

FB

5V Step-Up Converter with Reference Output

22µH*



2N3906

+

2.2µF

33k

100k

V

IN

100µF

LBO

LT1303-5

GND PGND

+

R2

R1

SW

SENSE

SHDNLBI

V

+

100µF

1303 TA03

1N5817

OUT

OUTPUT
5V


+

100µF

* SUMIDA CD54-220MC

1303 TA04

9

LT1303/LT1303-5

U

TYPICAL APPLICATIONS

4-, 5-Cell to 5V Converter with Output Disconnect

510Ω

SW

SENSE

SHDN

MBRS130T3

SHUTDOWN

+

ZTX788B

33µF

V

OUT

5V
100mA

+

220µF**

LT1303TA05

V

2V TO 8V

IN

+

33µF

SUMIDA CD54-100MC

*

AVX TPS 220µF/10V

**



10µH*

V

IN

LT1303-5

GND PGND

3-Cell to 3.3V Boost/Linear Converter with Output Disconnect

10

VIN

2V TO 6V

SHUTDOWN

+

SUMIDA CD54-100MC

*

AVX TPS 330µF/6.3V

**

†

1% METAL FILM 





33µF

10µH*

V

IN

SHDN

LT1303

LBI

GND PGND

MBRS130T3

SW

LB0

FB

1.96k

121k

100k

†

Si9433

100Ω

+

33µF

†

200k

†

V

3.3V/200mA

OUT

+

330µF**
× 2

LT1303 TA07

U

TYPICAL APPLICATIONS

V

IN

1.5V TO 8V

+

47µF

0.1µF
CERAMIC

SHUTDOWN

10Ω

V

IN

LT1303

SHDN

GND PGND

EL Panel Driver

T1**

MUR160

6

•

10

1N5818

3.3M

3.3M

FB

51k

†

R1
25k

4,5

1,2

1:15

•

SW

3.3M

1N4148

10k

LT1303/LT1303-5

C1*
50pF

4.7µF

160V

+

1k
1/2W

MPSA42

EL PANEL

100Hz TO 1000Hz

SQUARE WAVE

DRIVE





*

ADD C1 FOR OPEN-PANEL PROTECTION

**

DALE LPE5047-A132 1:15 TURNS RATIO [phone]

†

R1 ADJUSTS V

OUT

83V

RMS

TO 115V

RMS

LT1303 TA06

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 represen­tation that the interconnection of circuits as described herein will not infringe on existing patent rights.

11

LT1303/LT1303-5

PACKAGE DESCRIPTION

0.300 – 0.325

(7.620 – 8.255)

U

Dimensions in inches (millimeters) unless otherwise noted.

N8 Package

8-Lead Plastic DIP

0.045 – 0.065

(1.143 – 1.651)

0.130 ± 0.005

(3.302 ± 0.127)

0.400*
(10.160)

MAX

876

5

0.065

(1.651)

0.009 – 0.015

(0.229 – 0.381)

+0.025

0.325

–0.015

+0.635

8.255

()

–0.381

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

0.010 – 0.020

(0.254 – 0.508)

0.008 – 0.010

(0.203 – 0.254)

*

DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH 


SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**

DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD 
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE



× 45°

0.016 – 0.050

0.406 – 1.270

TYP

0.005

(0.127)

MIN

0.100 ± 0.010

(2.540 ± 0.254)

0.053 – 0.069

(1.346 – 1.752)

0°– 8° TYP

0.014 – 0.019

(0.355 – 0.483)

0.125

(3.175)

MIN



0.018 ± 0.003

(0.457 ± 0.076)

S8 Package

8-Lead Plastic SOIC

0.004 – 0.010

(0.101 – 0.254)

0.050

(1.270)

BSC

0.015

(0.380)

MIN

0.228 – 0.244

(5.791 – 6.197)

0.255 ± 0.015*
(6.477 ± 0.381)



8

1



12

0.189 – 0.197*
(4.801 – 5.004)

7

6

3

2

4

3

N8 0695

5

0.150 – 0.157**
(3.810 – 3.988)

4

SO8 0695

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PART NUMBER DESCRIPTION COMMENTS

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LT/GP 0195 10K • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 1995

12

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7487

[phone]

●

FAX

: [phone]

●

TELEX

: 499-3977