LM3354
Regulated 90mA Buck-Boost Switched Capacitor DC/DC
Converter
General Description
The LM3354 is a CMOS switched capacitor DC/DC con-
verter that produces a regulated output voltage by automati-
cally 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 for white LED applications), and 5.0V.
If other output voltage options between 1.8V and 5.0V are
desired, please contact your National Semiconductor repre-
sentative.
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 shut-
down 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
1
V
IN
Input Supply Voltage
2
C1-
Negative Terminal for C1
3
C1+
Positive Terminal for C1
4
GND
Ground
5
GND
Ground
6
C
FIL
Filter Capacitor, a 1µF capacitor is recommended.
7
SD
Shutdown, active low
8
V
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
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 (V
IN
)
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 T
A
= 25°C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: C
1
= C
2
= 0.33 µF; C
IN
= 10 µF; C
OUT
= 10 µF; C
FIL
= 1 µF; V
IN
= 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;
1 mA
<
I
LOAD
<
90 mA
4.85/4.8
5.0
5.15/5.2
V
3.1V
<
V
IN
<
5.5V;
1 mA
<
I
LOAD
<
55 mA
4.85/4.8
5.0
5.15/5.2
2.9V
<
V
IN
<
5.5V;
1 mA
<
I
LOAD
<
30 mA
4.85/4.8
5.0
5.15/5.2
Efficiency
I
LOAD
= 15 mA
85
%
I
LOAD
= 40 mA, V
IN
= 3.8V
85
Output Voltage Ripple
(Peak-to-Peak)
I
LOAD
= 50 mA
C
OUT
= 10 µF ceramic
75
mV
P-P
LM3354-4.1
Output Voltage (V
OUT
)
2.9V
<
V
IN
<
5.5V;
1 mA
<
I
LOAD
<
90 mA
3.977/3.936
4.1
4.223/4.264
V
2.5V
<
V
IN
<
5.5V;
1 mA
<
I
LOAD
<
40 mA
3.977/3.936
4.1
4.223/4.264
Efficiency
I
LOAD
= 15 mA
80
%
I
LOAD
= 70 mA
75
Output Voltage Ripple
(Peak-to-Peak)
I
LOAD
= 50 mA
C
OUT
= 10 µF ceramic
75
mV
P-P
LM3354-3.3
Output Voltage (V
OUT
)
2.9V
<
V
IN
<
5.5V;
1 mA
<
I
LOAD
<
70 mA
3.201/3.168
3.3
3.399/3.432
V
2.5V
<
V
IN
<
5.5V;
1 mA
<
I
LOAD
<
70 mA
3.201/3.168
3.3
3.399/3.432
Efficiency
I
LOAD
= 15 mA
90
%
I
LOAD
= 70 mA
70
Output Voltage Ripple
(Peak-to-Peak)
I
LOAD
= 50 mA
C
OUT
= 10 µF ceramic
75
mV
P-P
LM3354-1.8
Output Voltage (V
OUT
)
2.9V
<
V
IN
<
5.5V;
1 mA
<
I
LOAD
<
90 mA
1.728/1.710
1.8
1.872/1.89
V
2.5V
<
V
IN
<
5.5V;
1 mA
<
I
LOAD
<
80 mA
1.728/1.710
1.8
1.872/1.89
Efficiency
I
LOAD
= 15 mA
75
%
I
LOAD
= 70 mA
70
Output Voltage Ripple
(Peak-to-Peak)
I
LOAD
= 50 mA
C
OUT
= 10 µF ceramic
25
mV
P-P
LM3354
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3
Electrical Characteristics
(Continued)
Limits in standard typeface are for T
A
= 25°C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: C
1
= C
2
= 0.33 µF; C
IN
= 10 µF; C
OUT
= 10 µF; C
FIL
= 1 µF; V
IN
= 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 k
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 statistical analysis. 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
www.national.com
4
Typical Performance Characteristics
Unless otherwise specified T
A
= 25°C. (Continued)
V
OUT
vs. V
IN
DS200188-4
V
OUT
vs. V
IN
DS200188-5
V
OUT
vs. V
IN
DS200188-34
V
OUT
vs. V
IN
DS200188-35
V
OUT
vs. V
IN
DS200188-36
V
OUT
vs. V
IN
DS200188-37
LM3354
www.national.com
5
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