NSC LM3352MTCX-3.3, LM3352MTCX-3.0, LM3352MTCX-2.5, LM3352MTC-3.0, LM3352MTC-2.5 Datasheet
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September 1999
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 and 3.3V. 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 mA of 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
nRegulated VOUT with ±3% accuracy
nStandard output voltage options: 2.5V, 3.0V and 3.3V
nCustom output voltages available from 1.8V to 4.0V in 100 mV increments
n2.5V to 5.5V input voltage
nUp to 200 mA output current
n>80% average efficiency
nUses few, low-cost external components
nVery small solution size
n400 µA typical operating current
n2.5 µA typical shutdown current
n1 MHz switching frequency (typical)
nArchitecture and control methods provide high load current and good efficiency
nTSSOP-16 package
nOver-temperature protection
Applications
n1-cell Lilon battery-operated equipment including PDAs, hand-held PCs, cellular phones
nFlat panel displays
nHand-held instruments
nNiCd, NiMH, or alkaline battery powered systems
n3.3V to 2.5V and 5.0V to 3.3V conversion
Typical Operating Circuit
DS101037-1
Converter DC/DC Capacitor Switched Boost-Buck mA 200 Regulated LM3352
© 1999 National Semiconductor Corporation |
DS101037 |
www.national.com |
Connection Diagram
DS101037-2
Top View
TSSOP-16 Pin Package
See NS Package Number MTC16
Ordering Information
Order Number |
Package Type |
NSC Package Drawing |
Supplied As |
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LM3352MTCX-2.5 |
TSSOP-16 |
MTC16 |
2.5k Units, Tape and Reel |
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LM3352MTC-2.5 |
TSSOP-16 |
MTC16 |
94 Units, Rail |
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LM3352MTCX-3.0 |
TSSOP-16 |
MTC16 |
2.5k Units, Tape and Reel |
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LM3352MTC-3.0 |
TSSOP-16 |
MTC16 |
94 Units, Rail |
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LM3352MTCX-3.3 |
TSSOP-16 |
MTC16 |
2.5k Units, Tape and Reel |
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LM3352MTC-3.3 |
TSSOP-16 |
MTC16 |
94 Units, Rail |
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Pin Description
Pin Number |
Name |
Function |
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1 |
GND |
Ground* |
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2 |
C3− |
Negative Terminal for C3 |
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3 |
C3+ |
Positive Terminal for C3 |
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4 |
C2− |
Negative Terminal for C2 |
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5 |
C2+ |
Positive Terminal for C2 |
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6 |
C1− |
Negative Terminal for C1 |
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7 |
C1+ |
Positive Terminal for C1 |
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8 |
VOUT |
Regulated Output Voltage |
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9 |
GND |
Ground* |
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10 |
VIN |
Input Supply Voltage |
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11 |
NC |
This pin must be left unconnected. |
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12 |
GND |
Ground* |
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13 |
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Active Low CMOS Logic-Level Shutdown Input |
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SD |
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14 |
GND |
Ground* |
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15 |
CFIL |
Filter Capacitor; A 1 µF ceramic capacitor is suggested. |
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16 |
GND |
Ground* |
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*All GND pins of the LM3352 must be connected to the same ground.
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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.
VOUT Pin |
−0.5V to 4.5V |
All Other Pins |
−0.5V to 5.6V |
Power Dissipation (TA = 25ÊC) |
700 mW |
(Note 2) |
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TJMAX (Note 2) |
150ÊC |
θJA (Note 2) |
150ÊC/W |
Storage Temperature |
−65ÊC to +150ÊC |
Lead Temperature (Soldering, 5 sec.) |
260ÊC |
ESD Rating (Note 3) |
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human body model |
2 kV |
machine model |
100V |
Operating Ratings
Input Voltage (VIN ) |
2.5V to 5.5V |
Output Voltage (VOUT ) |
1.8V to 4.0V |
Ambient Temperature (TA ) (Note 2) |
−40ÊC to +85ÊC |
Junction Temperature (T J) (Note 2) |
−40ÊC to +125ÊC |
Electrical Characteristics
Limits in standard typeface are for TJ = 25ÊC, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: C1 = C2 = C3 = 0.33 µF; CIN = 15 µF; COUT = 33 µF; VIN = 3.5V.
Parameter |
Conditions |
Min |
Typ |
Max |
Units |
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LM3352-2.5 |
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Output Voltage (V OUT) |
VIN = 3.5V; I LOAD = 100 mA |
2.463 |
2.5 |
2.537 |
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2.8V < VIN < 5.5V; |
2.425/2.400 |
2.5 |
2.575/2.600 |
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1 mA < ILOAD < 100 mA |
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3.6V < VIN < 4.9V; |
2.425/2.400 |
2.5 |
2.575/2.600 |
V |
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1 mA < ILOAD < 200 mA |
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4.9V < VIN < 5.5V; |
2.425/2.400 |
2.5 |
2.575/2.600 |
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1 mA < ILOAD < 175 mA |
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Efficiency |
ILOAD = 15 mA |
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85 |
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% |
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ILOAD = 150 mA, VIN = 4.0V |
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75 |
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Output Voltage Ripple |
ILOAD = 50 mA |
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75 |
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mVP-P |
(Peak-to-Peak) |
C OUT = 33 µF tantalum |
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LM3352-3.0 |
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Output Voltage (V OUT) |
VIN = 3.5V; I LOAD = 100 mA |
2.955 |
3.0 |
3.045 |
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2.5V < VIN < 5.5V; |
2.910/2.880 |
3.0 |
3.090/3.120 |
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1 mA < ILOAD < 100 mA |
V |
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3.8V < VIN < 5.5V; |
2.910/2.880 |
3.0 |
3.090/3.120 |
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1 mA < ILOAD < 200 mA |
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Efficiency |
ILOAD = 15 mA |
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80 |
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% |
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ILOAD = 150 mA, VIN = 4.0V |
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75 |
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Output Voltage Ripple |
ILOAD = 50 mA |
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75 |
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mVP-P |
(Peak-to-Peak) |
C OUT = 33 µF tantalum |
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LM3352-3.3 |
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Output Voltage (V OUT) |
VIN = 3.5V; I LOAD = 100 mA |
3.251 |
3.3 |
3.349 |
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2.5V < VIN < 5.5V; |
3.201/3.168 |
3.3 |
3.399/3.432 |
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1 mA < ILOAD < 100 mA |
V |
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4.0V < VIN < 5.5V; |
3.201/3.168 |
3.3 |
3.399/3.432 |
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1 mA < ILOAD < 200 mA |
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Efficiency |
ILOAD = 15 mA |
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90 |
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% |
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ILOAD = 150 mA, VIN = 4.0V |
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80 |
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Output Voltage Ripple |
ILOAD = 50 mA |
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75 |
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mVP-P |
(Peak-to-Peak) |
C OUT = 33 µF tantalum |
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LM3352-ALL OUTPUT VOLTAGE VERSIONS |
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Operating Quiescent Current |
Measured at Pin VIN; |
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400 |
500 |
µA |
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I LOAD = 0A (Note 4) |
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Shutdown Quiescent Current |
SD Pin at 0V (Note 5) |
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2.5 |
5 |
µA |
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Switching Frequency |
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0.65 |
1 |
1.35 |
MHz |
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SD Input Threshold Low |
2.5V < VIN < 5.5V |
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0.2 VIN |
V |
SD Input Threshold High |
2.5V < VIN < 5.5V |
0.8 VIN |
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V |
3 |
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Electrical Characteristics (Continued)
Limits in standard typeface are for TJ = 25ÊC, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: C1 = C2 = C3 = 0.33 µF; CIN = 15 µF; COUT = 33 µF; VIN = 3.5V.
Parameter |
Conditions |
Min |
Typ |
Max |
Units |
LM3352-ALL OUTPUT VOLTAGE VERSIONS |
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SD Input Current |
Measured at SD Pin; |
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0.1 |
1.0 |
µA |
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SD Pin = VIN = 5.5V |
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Note 1: ªAbsolute Maximum Ratingsº 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 TA ≤ +85ÊC, 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 VIN > 5V with the 2.5V option, the junction temperature rise above ambient is: T = 540IL−23 where I L is in amps. The output current must be derated at higher ambient temperatures to make sure TJ does not exceed 150ÊC when operating the 2.5V option at VIN > 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 directly into each pin.
Note 4: The VOUT pin is forced to 200 mV above the typical VOUT. This is to insure that the internal switches are off.
Note 5: The output capacitor COUT is fully discharged before measurement.
Typical Performance Characteristics Unless otherwise specified TA = 25ÊC.
VOUT vs. VIN |
VOUT vs. VIN |
DS101037-4 |
DS101037-5 |
VOUT vs. VIN |
VOUT vs. VIN |
DS101037-6 |
DS101037-7 |
www.national.com |
4 |
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