NSC LM3352MTCX-3.3, LM3352MTCX-3.0, LM3352MTCX-2.5, LM3352MTC-3.0, LM3352MTC-2.5 Datasheet
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LM3352
Regulated 200 mA Buck-Boost Switched Capacitor
DC/DC Converter
General Description
The LM3352 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 LM3352 is available in three standard output voltage
versions: 2.5V, 3.0V and3.3V.If other output voltage options
between 1.8V and 4.0V are desired, please contact your National Semiconductor representative.
The LM3352’s proprietary buck-boost architecture enables
up to 200 mAof load current at an average efficiency greater
than 80%. Typical operating current is only 400 µA and the
typical shutdown current is only 2.5 µA.
The LM3352 is available in a 16-pin TSSOP package. This
package has a maximum height of only 1.1 mm.
The high efficiency of the LM3352, 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.
Features
n Regulated V
OUT
with±3%accuracy
n Standard output voltage options: 2.5V, 3.0V and 3.3V
n Custom output voltages available from 1.8V to 4.0V in
100 mV increments
n 2.5V to 5.5V input voltage
n Up to 200 mA output current
n
>
80%average efficiency
n Uses few, low-cost external components
n Very small solution size
n 400 µA typical operating current
n 2.5 µA typical shutdown current
n 1 MHz switching frequency (typical)
n Architecture and control methods provide high load
current and good efficiency
n TSSOP-16 package
n Over-temperature protection
Applications
n 1-cell Lilon battery-operated equipment including PDAs,
hand-held PCs, cellular phones
n Flat panel displays
n Hand-held instruments
n NiCd, NiMH, or alkaline battery powered systems
n 3.3V to 2.5V and 5.0V to 3.3V conversion
Typical Operating Circuit
DS101037-1
September 1999
LM3352 Regulated 200 mA Buck-Boost Switched Capacitor DC/DC Converter
© 1999 National Semiconductor Corporation DS101037 www.national.com
Connection Diagram
Ordering Information
Order Number Package Type NSC Package Drawing Supplied As
LM3352MTCX-2.5 TSSOP-16 MTC16 2.5k Units, Tape and Reel
LM3352MTC-2.5 TSSOP-16 MTC16 94 Units, Rail
LM3352MTCX-3.0 TSSOP-16 MTC16 2.5k Units, Tape and Reel
LM3352MTC-3.0 TSSOP-16 MTC16 94 Units, Rail
LM3352MTCX-3.3 TSSOP-16 MTC16 2.5k Units, Tape and Reel
LM3352MTC-3.3 TSSOP-16 MTC16 94 Units, Rail
Pin Description
Pin Number Name Function
1 GND Ground
*
2 C3− Negative Terminal for C3
3 C3+ Positive Terminal for C3
4 C2− Negative Terminal for C2
5 C2+ Positive Terminal for C2
6 C1− Negative Terminal for C1
7 C1+ Positive Terminal for C1
8V
OUT
Regulated Output Voltage
9 GND Ground
*
10 V
IN
Input Supply Voltage
11 NC This pin must be left unconnected.
12 GND Ground
*
13 SD Active Low CMOS Logic-Level Shutdown Input
14 GND Ground
*
15 C
FIL
Filter Capacitor;A1µFceramic capacitor is suggested.
16 GND Ground
*
*
All GND pins of the LM3352 must be connected to the same ground.
DS101037-2
Top View
TSSOP-16 Pin Package
See NS Package Number MTC16
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.
V
OUT
Pin −0.5V to 4.5V
All Other Pins −0.5V to 5.6V
Power Dissipation (T
A
= 25˚C)
(Note 2) 700 mW
T
JMAX
(Note 2) 150˚C
θ
JA
(Note 2) 150˚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
2kV
100V
Operating Ratings
Input Voltage (VIN) 2.5V to 5.5V
Output Voltage (V
OUT
) 1.8V to 4.0V
Ambient Temperature (T
A
) (Note 2) −40˚C to +85˚C
Junction Temperature (T
J
) (Note 2) −40˚C to +125˚C
Electrical Characteristics
Limits in standard typeface are for T
J
=
25˚C, and limits in boldface type apply over the full operating temperature range. Unless
otherwise specified: C
1
=
C
2
=
C
3
=
0.33 µF; C
IN
=
15 µF; C
OUT
=
33 µF; V
IN
=
3.5V.
Parameter Conditions Min Typ Max Units
LM3352-2.5
Output Voltage (V
OUT
)V
IN
= 3.5V; I
LOAD
= 100 mA 2.463 2.5 2.537
V
2.8V
<
V
IN
<
5.5V;
1mA
<
I
LOAD
<
100 mA
2.425/2.400 2.5 2.575/2.600
3.6V
<
V
IN
<
4.9V;
1mA
<
I
LOAD
<
200 mA
2.425/2.400 2.5 2.575/2.600
4.9V
<
V
IN
<
5.5V;
1mA
<
I
LOAD
<
175 mA
2.425/2.400 2.5 2.575/2.600
Efficiency I
LOAD
=15mA 85
%
I
LOAD
= 150 mA, VIN= 4.0V 75
Output Voltage Ripple
(Peak-to-Peak)
I
LOAD
=50mA
C
OUT
= 33 µF tantalum
75 mV
P-P
LM3352-3.0
Output Voltage (V
OUT
)V
IN
= 3.5V; I
LOAD
= 100 mA 2.955 3.0 3.045
V
2.5V
<
V
IN
<
5.5V;
1mA
<
I
LOAD
<
100 mA
2.910/2.880 3.0 3.090/3.120
3.8V
<
V
IN
<
5.5V;
1mA
<
I
LOAD
<
200 mA
2.910/2.880 3.0 3.090/3.120
Efficiency I
LOAD
=15mA 80
%
I
LOAD
= 150 mA, VIN= 4.0V 75
Output Voltage Ripple
(Peak-to-Peak)
I
LOAD
=50mA
C
OUT
= 33 µF tantalum
75 mV
P-P
LM3352-3.3
Output Voltage (V
OUT
)V
IN
= 3.5V; I
LOAD
= 100 mA 3.251 3.3 3.349
V
2.5V
<
V
IN
<
5.5V;
1mA
<
I
LOAD
<
100 mA
3.201/3.168 3.3 3.399/3.432
4.0V
<
V
IN
<
5.5V;
1mA
<
I
LOAD
<
200 mA
3.201/3.168 3.3 3.399/3.432
Efficiency I
LOAD
=15mA 90
%
I
LOAD
= 150 mA, VIN= 4.0V 80
Output Voltage Ripple
(Peak-to-Peak)
I
LOAD
=50mA
C
OUT
= 33 µF tantalum
75 mV
P-P
LM3352-ALL OUTPUT VOLTAGE VERSIONS
Operating Quiescent Current Measured at Pin V
IN
;
I
LOAD
= 0A (Note 4)
400 500 µA
Shutdown Quiescent Current SD Pin at 0V (Note 5) 2.5 5 µA
Switching Frequency 0.65 1 1.35 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
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Electrical Characteristics (Continued)
Limits in standard typeface are for T
J
=
25˚C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: C
1
=
C
2
=
C
3
=
0.33 µF; C
IN
=
15 µF; C
OUT
=
33 µF; V
IN
=
3.5V.
Parameter Conditions Min Typ Max Units
LM3352-ALL OUTPUT VOLTAGE VERSIONS
SD Input Current Measured at SD Pin;
SD Pin = V
IN
= 5.5V
0.1 1.0 µA
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.
Note 2: As long as T
A
≤ +85˚C, all electrical characteristics hold true for the 3.0V and 3.3V options at all current loads and the 2.5V option at all loads when VIN≤
5V. For V
IN
>
5V with the 2.5V option, the junction temperature rise above ambient is: ∆T=540IL−23 where ILis in amps. The output current must be derated at
higher ambient temperatures to make sure T
J
does not exceed 150˚C when operating the 2.5V option at V
IN
>
5V.
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 di-
rectly into each pin.
Note 4: 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 5: 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
DS101037-4
V
OUT
vs. V
IN
DS101037-5
V
OUT
vs. V
IN
DS101037-6
V
OUT
vs. V
IN
DS101037-7
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