NSC LM3354MMX-5.0, LM3354MMX-3.3, LM3354MMX-1.8, LM3354MM-5.0, LM3354MM-4.1 Datasheet

LM3354
Regulated 90mA Buck-Boost Switched Capacitor DC/DC
Converter

General Description

The LM3354 is a CMOS switched capacitor DC/DC con­verter that produces a regulated output voltage by automati­cally stepping up (boost) or stepping down (buck) the input
voltage. It accepts an input voltage between 2.5V and 5.5V.
The LM3354 is available with standard output voltages of

1.8V, 3.3V, 4.1V (ideal forwhite LED applications), and 5.0V.
If other output voltage options between 1.8V and 5.0V are
desired, please contact your National Semiconductor repre­sentative.

The LM3354’s proprietary buck-boost architecture enables
up to 90mA of load current at an average efficiency greater
than 75%. Typical operating current is only 375 µA and the
typical shutdown current is only 2.3 µA.

The LM3354 is available in a 10-pin MSOP package. This
package has a maximum height of only 1.1 mm.

The high efficiency of the LM3354, low operating and shut­down currents, small package size, and the small size of the
overall solution make this device ideal for battery powered,
portable, and hand-held applications.

See the LM3352 for up to 200mA of output current or the
LM3355 for up to 50mA of output current.

Features

n Regulated V

OUT

with±3% (5.0V, 4.1V, and 3.3V

options) or

±

4% (1.8V option) accuracy

n Standard output voltages of 1.8V, 3.3V, 4.1V, and 5.0V
n Custom output voltages available from 1.8V to 5.0V in

100 mV increments with volume order

n 2.5V to 5.5V input voltage range
n Up to 90mA (5.0V, 4.1V, and 1.8V options) or 70mA

(3.3V option) output current

n

>

75% average efficiency

n Uses few, low-cost external components
n Very small solution size
n 375 µA typical operating current
n 2.3 µA typical shutdown current
n 1 MHz typical switching frequency
n Architecture and control methods provide high load

current and good efficiency

n MSOP-10 package
n Over-temperature protection

Applications

n White LED display backlights
n 1-cell Lilon battery-operated equipment including PDAs,

hand-held PCs, cellular phones

n Flat panel displays
n Hand-held instruments
n Li-Ion, NiCd, NiMH, or alkaline battery powered systems

Typical Operating Circuit

DS200188-1

February 2002

LM3354 Regulated 90mA Buck-Boost Switched Capacitor DC/DC Converter

© 2002 National Semiconductor Corporation DS200188 www.national.com

Connection Diagram

Ordering Information

Order Number Package Type NSC Package Drawing Supplied As

LM3354MMX-5.0 MSOP-10 MUB10A 3.5k Units, Tape and Reel
LM3354MM-5.0 MSOP-10 MUB10A 1k Units, Tape and Reel
LM3354MMX-4.1 MSOP-10 MUB10A 3.5k Units, Tape and Reel
LM3354MM-4.1 MSOP-10 MUB10A 1k Units, Tape and Reel
LM3354MMX-3.3 MSOP-10 MUB10A 3.5k Units, Tape and Reel
LM3354MM-3.3 MSOP-10 MUB10A 1k Units, Tape and Reel
LM3354MMX-1.8 MSOP-10 MUB10A 3.5k Units, Tape and Reel
LM3354MM-1.8 MSOP-10 MUB10A 1k Units, Tape and Reel

Pin Description

Pin Number Name Function

1V

IN

Input Supply Voltage
2 C1− Negative Terminal for C1
3 C1+ Positive Terminal for C1
4 GND Ground
5 GND Ground
6C

FIL

Filter Capacitor, a 1µF capacitor is recommended.
7SD

Shutdown, active low
8V

OUT

Regulated Output Voltage
9 C2− Negative Terminal for C2

10 C2+ Positive Terminal for C2

DS200188-2

Top View

MSOP-10 Pin Package

See NS Package Number MM

LM3354

www.national.com 2

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

All Pins −0.5V to 5.6V
Power Dissipation (T

A

= 25˚C)

(Note 2) Internally Limited

T

JMAX

(Note 2) 150˚C

θ

JA

(Note 2) 250˚C/W
Storage Temperature −65˚C to +150˚C
Lead Temperature (Soldering, 5 sec.) 260˚C

ESD Rating (Note 3)

Human Body Model
Machine Model

1.5 kV
100V

Operating Ratings

Input Voltage (VIN) 2.5V to 5.5V
Output Voltage (V

OUT

) 1.8V to 5.0V

Ambient Temperature (T

A

) (Note 2) −40˚C to +85˚C

Junction Temperature (T

J

) (Note 2) −40˚C to +120˚C

Electrical Characteristics

Limits in standard typeface are for TA= 25˚C, and limits in boldface type apply over the full operating temperature range. Un­less otherwise specified: C

1=C2

= 0.33 µF; CIN= 10 µF; C

OUT

= 10 µF; C

FIL

= 1 µF; VIN= 3.5V.

Parameter Conditions Min

(Note 5)

Typ

(Note 4)

Max

(Note 5)

Units

LM3354-5.0

Output Voltage (V

OUT

) 3.4V<V

IN

<

5.5V;

1mA

<

I

LOAD

<

90 mA

4.85/4.8 5.0 5.15/5.2

V

3.1V

<

V

IN

<

5.5V;

1mA

<

I

LOAD

<

55 mA

4.85/4.8 5.0 5.15/5.2

2.9V

<

V

IN

<

5.5V;

1mA

<

I

LOAD

<

30 mA

4.85/4.8 5.0 5.15/5.2

Efficiency I

LOAD

=15mA 85

%

I

LOAD

= 40 mA, VIN= 3.8V 85

Output Voltage Ripple
(Peak-to-Peak)

I

LOAD

=50mA

C

OUT

= 10 µF ceramic

75 mV

P-P

LM3354-4.1

Output Voltage (V

OUT

) 2.9V<V

IN

<

5.5V;

1mA

<

I

LOAD

<

90 mA

3.977/3.936 4.1 4.223/4.264
V

2.5V

<

V

IN

<

5.5V;

1mA

<

I

LOAD

<

40 mA

3.977/3.936 4.1 4.223/4.264

Efficiency I

LOAD

=15mA 80

%

I

LOAD

=70mA 75

Output Voltage Ripple
(Peak-to-Peak)

I

LOAD

=50mA

C

OUT

= 10 µF ceramic

75 mV

P-P

LM3354-3.3

Output Voltage (V

OUT

) 2.9V<V

IN

<

5.5V;

1mA

<

I

LOAD

<

70 mA

3.201/3.168 3.3 3.399/3.432
V

2.5V

<

V

IN

<

5.5V;

1mA

<

I

LOAD

<

70 mA

3.201/3.168 3.3 3.399/3.432

Efficiency I

LOAD

=15mA 90

%

I

LOAD

=70mA 70

Output Voltage Ripple
(Peak-to-Peak)

I

LOAD

=50mA

C

OUT

= 10 µF ceramic

75 mV

P-P

LM3354-1.8

Output Voltage (V

OUT

) 2.9V<V

IN

<

5.5V;

1mA

<

I

LOAD

<

90 mA

1.728/1.710 1.8 1.872/1.89
V

2.5V

<

V

IN

<

5.5V;

1mA

<

I

LOAD

<

80 mA

1.728/1.710 1.8 1.872/1.89

Efficiency I

LOAD

=15mA 75

%

I

LOAD

=70mA 70

Output Voltage Ripple
(Peak-to-Peak)

I

LOAD

=50mA

C

OUT

= 10 µF ceramic

25 mV

P-P

LM3354

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Electrical Characteristics (Continued)

Limits in standard typeface are for TA= 25˚C, and limits in boldface type apply over the full operating temperature range. Un­less otherwise specified: C

1=C2

= 0.33 µF; CIN= 10 µF; C

OUT

= 10 µF; C

FIL

= 1 µF; VIN= 3.5V.

Parameter Conditions Min

(Note 5)

Typ

(Note 4)

Max

(Note 5)

Units

LM3354-ALL OUTPUT VOLTAGE VERSIONS

Operating Quiescent
Current

Measured at Pin V

IN

;

I

LOAD

= 0A (Note 6)

375 475 µA

Shutdown Quiescent
Current

SD Pin at 0V (Note 7) 2.3 5 µA

Switching Frequency 0.6 1 1.4 MHz
SD Input Threshold Low 2.5V

<

V

IN

<

5.5V 0.2 V

IN

V

SD Input Threshold High 2.5V

<

V

IN

<

5.5V 0.8 V

IN

V

SD Input Current Measured at SD Pin;

SD Pin = V

IN

= 5.5V

0.3 µA

Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is
intended to be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see “Electrical
Characteristics”.

Note 2: As long as T

A

≤ +85˚C, all electrical characteristics hold true and the junction temperature should remain below +120˚C except for the 5V output option.

The 5V option requires that T

A

≤ +60˚C.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin.

Note 4: Typical numbers are at 25˚C and represent the most likely norm.
Note 5: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100% tested

or guaranteed through statisticalanalysis.All limits at temperature extremes are guaranteed by correlation using standard Statistical Quality Control methods (SQC).
All limits are used to calculate Average Outgoing Quality Level (AOQL).

Note 6: The V

OUT

pin is forced to 200 mV above the typical V

OUT

. This is to insure that the internal switches are off.

Note 7: The output capacitor C

OUT

is fully discharged before measurement.

Typical Performance Characteristics Unless otherwise specified T

A

= 25˚C.

V

OUT

vs. V

IN

DS200188-41

V

OUT

vs. V

IN

DS200188-42

LM3354

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