LM3350MMX/NOPB [TI]
SWITCHED CAPACITOR CONVERTER, 1100kHz SWITCHING FREQ-MAX, PDSO8, MINI, SO-8;
| 型号： | LM3350MMX/NOPB |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | SWITCHED CAPACITOR CONVERTER, 1100kHz SWITCHING FREQ-MAX, PDSO8, MINI, SO-8 开关 光电二极管 |
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LM3350
LM3350 Switched Capacitor Voltage Converter
Literature Number: SNIS101B
OBSOLETE
December 28, 2010
LM3350
Switched Capacitor Voltage Converter
General Description
Features
The LM3350 is a CMOS charge-pump voltage converter
which efficiently provides a 3.3V to 5V step-up, or 5V to 3.3V
step-down. The LM3350 uses four small, low cost capacitors
to provide the voltage conversion. It eliminates the cost, size
and radiated EMI related to inductor based circuits, or the
power loss of a linear regulator. Operating power conversion
efficiency greater than 90% provides ideal performance for
battery powered portable systems.
Conversion of 3.3V to 5V, or 5V to 3.3V
■
■
■
■
■
4.2Ω typical step-up output impedance
1.8Ω typical step-down output impedance
90% typical power conversion efficiency at 50 mA
800 kHz switch frequency allows use of very small,
inexpensive capacitors.
No inductor required
■
■
■
The architecture provides a fixed voltage conversion ratio of
3/2 or 2/3. Thus it can be used for other DC-DC conversions
as well.
250 nA typical sdown current
Small Mini SOacke
Applicatons
Any miand 3.3V system
■
■
■
■
Laptop compand PDAs
Hdheld instrumntation
MCcards
Basic Operating Circuits
Step-Up verter
10000201
Step-Down Converter
10000202
© 2010 National Semiconductor Corporation
100002
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100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13
Connection Diagram
Mini SO8 Package
10000203
Top View
Ordering Information
NSC Package
Drawing
Order Number
Package Type
Package Marking
Supplied As
LM3350MMX
LM3350MM
Mini SO-8
Mini SO-8
MUA08A
MUA08A
S00A
S00A
0k Us on Tape and Reel
10its on Tape and Reel
Pin Descriptions
Pin
Name
Fution
1
2
3
4
5
Cap1+ Positive terminal he st charge pump
capacitor.
Cap1− Negative terminal for the fcharge pump
capacitor.
Cap2+ Positive terminr tsecond charge
pumor.
Cap2− Nal for the second charge
pu
Vlo
In Stde, this will be the input
terminal. In Step-Down mode, this will be
put terminal.
6
7
Gnd Grod
hiIn tep-Down mode, this will be the input
terminal. In Step-Up mode, this will be the
output terminal.
8
Ee Active high CMOS logic level Enable Input.
Connect to Voltage Input terminal to
enable the IC. Connect to Ground (Pin 6)
to disable.
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2
100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Operating Conditions (Note 1)
Ambient Temperature Range
−40°C to + 85°C
Maximum Input Voltage, Step-Down
Maximum Input Voltage, Step-Up
Power Dissipation (PD) (TA=25°C,
(Note 2))
5.5V
3.65V
500 mW
250°C/W
θ
ja (Note 2)
Tj Max (Note 2)
Storage Temperature
Lead Temperature (Soldering, 10 secs)
ESD Susceptibility (Note 3)
Not short circuit protected.
150°C
−65°C to +150°C
260°C
2kV
Electrical Characteristics
3/2 Step-Up Voltage Converter
Specifications in standard type face are for Tj = 25°C, and those with boldface pe apply ull operating temperature
range. Unless otherwise specified, Vin = 3.3V, VEnable = 3.3V, Iload = 50 mA.
Symbol
Parameter
Conditions
Typ e 4)
Limits (Note 5)
Units
Vout
Output Voltage at No
Load
5.0
V
C1, C2, Cin and Cout: 0.33µF, esr ≤ 0.Ω
at 1MHz. Iload = 0 A
NL
Vout
Output Voltage at 50
mA
4.7
3.3
V
C1, C2, Cin and Cout: 0.33µF, esr ≤ 0.33
FL
at 1MHz. Iload = 50 mA
Vin
Input Supply Voltage
Range
V
2.5
V(Min)
V(Max)
µA
3.65
IQ1
Quiescent Current
Quiescent Current
Shutdown Mode, VE=0 A;
Current into pin Vlow
0.025
3.75
4.2
µA(Max)
mA
3
5
IQ2
Normal Modeoad = 0A; nt into pin
VIow
mA(Max)
Zout
Output Source
Impedance
Iload = 50 mA
Ω
Ω (Max)
kHz
6.25
fSW
Switching Frequency
(No
800
500
kHz(Min)
kHz(Max)
V
1100
VEnable
Enable Threshold
Voltage
1.7
1.0
2.5
V(Min)
V(Max)
µA
IEnable
Pη
Leakage Current
Power Efficiency
Current into ENABLE pin; ENABLE = 5V
and all other pins at ground
0.025
90
1
µA(Max)
%
3
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100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13
Electrical Characteristics
2/3 Step-Down Voltage Converter
Specifications in standard type face are for Tj = 25°C, and those with boldface type apply over full operating temperature
range. Unless otherwise specified, Vhigh = 5V, VEnable = 5V, Iload = 50 mA.
Symbol
Parameter
Conditions
Typ (Note 4)
Limits (Note 5)
Units
Vout
Output Voltage at No
Load
3.3
V
C1, C2, Cin and Cout: 0.33µF, esr ≤ 0.33 Ω
at 1MHz. Iload = 0 A
NL
Vout
Output Voltage at 50
mA
3.2
5
V
C1, C2, Cin and Cout: 0.33 µF, esr ≤ 0.33Ω
FL
at 1MHz. Iload =50 mA
Vin
Input Supply Voltage
Range
V
2.2
5.5
V(Min)
V(Max)
µA
IQ1
Quiescent Current
Quiescent Current
Shutdown Mode, VEnable = 0V, Iload=0 A;
Current into pin Vhigh
0.25
3
3.3
3
µA(Max)
mA
IQ2
Normal Mode, IIoad = 0A; Current into pin
Vhigh
mA(Max)
Zout
Output Source
Impedance
Iload = 50 mA
1.8
Ω
Ω (Max)
kHz
fSW
Switching Frequency
(Note 6)
800
500
kHz(Min)
kHz(Max)
V
1100
VEnable
Enable Threshold
Voltage
1.7
1.0
2.5
V(Min)
V(Max)
µA
IEnable
Pη
Leakage Current
Power Efficiency
Current into ENABLE pABLE
and all other pins at
0.025
90
1
µA(Max)
%
Note 1: Absolute maximum ratings indicate limits beyond h damagdevice may occur. Operating ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific prmance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The
guaranteed specifications apply only for the test conditioistperformance characteristics may degrade when the device is not operated under the
listed test conditions.
Note 2: For operation at elevated temperatures, L50 must be ded based on package thermal resistance of θja and Tj max, Tj = TA+ θjaPD.
Note 3: The human body model is a 100 pF cascharged trough a 1.5 kW resistor into each pin.
Note 4: Typical numbers are at 25°C and reely parametric norm.
Note 5: Limits are 100% production tested at 25the operating temperature range are guaranteed through correlation using Statistical Quality
Control (SQC) methods. The limits are used to calcnal's Averaging Outgoing Quality Level (AOQL).
Note 6: The internal oscillator runs ae outpuswitches operate at one half of the oscillator frequency, fOSC = 2fSW
.
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100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13
Typical Performance Characteristics
Vout vs Iload (Step-Up)
Pη vs Iload (Step-Up)
10000204
10000206
Output Source Impedance vs Temperature (Step-Up)
vs Iload (Step-Down)
19
10000205
Output Source Impedance vs Temperature (Step-Down)
Pη vs Iload (Step-Do
10000208
10000207
5
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100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13
Switching Frequency vs Temperature
10000210
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ple. The value of this capacitor (Cout) can be calculated (ap-
proximately) based on the output ripple (ΔVout) requirements
from:
Detailed Operation
OPERATING PRINCIPLE
The LM3350 is a charge-pump voltage converter that pro-
vides a voltage conversion ratio of 3/2 in step-up mode and a
conversion ratio of 2/3 in the step-down mode. Thus it can be
used in the step-down mode to provide a 3.3V output from a
regulated 5V input or in the step-up mode to provide a 5V
output from a regulated 3.3V input. Other values of input volt-
ages can be used as long as they are within the limits.
where Iload is the load current and fO is the oscillator frequen-
cy.
In order to ensure superior performance over the entire op-
erating temperature range, capacitors made of X7R dielectric
material are suggested. However, capacitors made of other
dielectric materials that still meet the ±20% specification over
the entire temperature range can also be used.
The LM3350 contains an array of CMOS switches which are
operated in a certain sequence to provide the step-up or step-
down of the input supply. An internal RC oscillator provides
the timing signals.
Energy transfer and storage are provided by four inexpensive
ceramic capacitors. The selection of these capacitors is ex-
plained in the Capacitor Selection section under Application
Information.
STEP-UP APPLICATIONS NEED AN EXTRA DIODE
The LM3350 is biased from pin Vhigh. Thus for step-up appli-
cations, an external Schottky diode (D1) is needed to supply
power to Vhigh during startup (See Figure 2). Note that during
shutdown, this diode will provide a DC path from Vin to Vout
.
The load may therefore continue to draw current from the in-
put voltage source. This Schottky diode is not required for
step-down applications (See Figure 3).
SHUTDOWN MODE
When ENABLE is a logic low (ground), the LM3350 enters a
low power shutdown mode. In this mode, all circuitry is dis-
abled and therefore, all switching action stops. During shut
down, the current consumption drops to 250 nA (ty
When ENABLE is a logic high, (i.e. 3.3V for step-up mo
5.0V for step-down mode), the LM3350 returns to nor
eration.
10000211
A. Step-Up Mode
Application Information
CAPACITOR SELECTION
The LM3350 requires four capacitorsput bypas ca-
pacitor (connected between Vin and tput hold
capacitor (connected between Vout and two
sampling capacitors (C1 and C2 in Figu). 0.33 µF
(±20%) ceramic chip type caparecoended for all
four capacitors. The usable quency should be
greater than 5 MHz for all c
10000212
The input bypass capacitor (st critical. Its value
should be at least that of the samcapacitors.
B. Step-Down Mode
While the recommended sampling capacitor values are 0.33
µF, other values may be selected. Values other than 0.33 µF
affect maximum output current rating and efficiency. Figure
1 shows typical output impedance (Zout) versus capacitor val-
ue.
FIGURE 1. Zout vs. C
PRECAUTIONS
The LM3350 is not short circuit protected.
The output hold capacitor value determines the output ripple.
Increasing the value of the hold capacitor decreases the rip-
7
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100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13
Typical Application Circuits
10000213
FIGURE 2. Step-Up Converter
10000214
FIGURE Step-Down Converter
and high frequency ringing. Of the four capacitors, Chigh and
Clow have the highest value of di/dt. It is therefore most im-
portant to keep them close to the IC. The ground lead that
Chigh and Clow share should also be kept wide and short.
Layout Information
LAYOUT CONSIDERATIONS
The LM3350's high switchin800 kHz) makes a
good layout important. Figua typical layout. It
is important to keep the disttween the four ca-
pacitors and the IC. Wide tragrounding are also
recommended. These steps will minimize trace inductance
The location of the diode (D1) used in the step-up configura-
tion is not critical. This diode is only used during the initial turn
on of the IC. D1 is not needed in step-down applications.
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100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13
10000216
B. Actual Size of the Layout
10000215
A. Copper side (5X)
10000217
side with Component Locations (5X)
FIGURE 4. Typical Layout
9
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100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead i SO (MM)
Order Number LM33MX or M3350MM
NS Package NumM08A
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100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13
Notes
11
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100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13
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相关型号：
LM3350MWC
IC SWITCHED CAPACITOR CONVERTER, 1100 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator or Controller
NSC
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