LM2773 PDF даташит
Спецификация LM2773 изготовлена «National Semiconductor» и имеет функцию, называемую «Low-Ripple 1.8V/1.6V Spread-Spectrum Switched Capacitor Step-Down Regulator». |
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Детали детали
Номер произв | LM2773 |
Описание | Low-Ripple 1.8V/1.6V Spread-Spectrum Switched Capacitor Step-Down Regulator |
Производители | National Semiconductor |
логотип |
12 Pages
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January 22, 2008
LM2773
Low-Ripple 1.8V/1.6V Spread-Spectrum Switched
Capacitor Step-Down Regulator
General Description
The LM2773 is a switched capacitor step-down regulator that
produces a selectable 1.8V or 1.6V output. It is capable of
supplying loads up to 300mA. The LM2773 operates with an
input voltage from 2.5V to 5.5V, accommodating 1-cell Li-Ion
batteries and chargers.
The LM2773 utilizes a regulated charge pump with gains of
2/3x and 1x. It has very low ripple and noise on both the input
and output due to its pre-regulated 1.15MHz (typ.) switching
frequency and spread spectrum operation. When output cur-
rents are low, the LM2773 automatically switches to a low-
ripple PFM regulation mode to maintain high efficiency over
the entire load range.
The LM2773 is available in National’s 0.5mm pitch 9-bump
Micro-SMD (µSMD-9).
Features
■ Low-Noise Spread Spectrum Operation
■ 1.8V/1.6V Selectable Output Voltage
■ 2% Output Voltage Regulation
■ > 75% Efficiency in 1.8V Mode
■ Very Low Output Ripple: 10mV @ 300mA
■ Output Currents up to 300mA
■ 2.5V to 5.5V Input Voltage Range
■ Shutdown Disconnects Load from VIN
■ 1.15MHz Switching Frequency
■ No Inductors…Small Solution Size
■ Short Circuit and Thermal Protection
■ 0.5mm pitch, µSMD-9 (1.511 × 1.511mm × 0.6mm)
Applications
■ Power Supply for DSP's, Memory, and Microprocessors
■ Mobile Phones and Pagers
■ Digital Cameras, Portable Music Players, and Other
Portable Electronic Devices
Typical Application Circuit
LM2773 Efficiency vs.
Low-Dropout Linear Regulator (LDO) Efficiency
30047401
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Connection Diagram and Package Mark Information
9-Bump Micro SMD (µSMD-9)
NS Package Number TLA9ZZA, 0.5mm Pitch
1.511mm x 1.511mm x 0.6mm
30047402
Note 1: The actual physical placement of the package marking will vary from part to part. The package marking "X" designates the single digit date code. "V" is
a NSC internal code for die traceability. Both will vary considerably. "DJ" identifies the device (part number, option, etc.).
Pin Descriptions
Pin #
A1
A2
A3
B1
B2
B3
C1
C2
C3
Name
C2-
VOUT
C1+
GND
EN
VIN
SEL
C1-
C2+
Description
Flying Capacitor 2: Negative Terminal
Output Voltage
Flying Capacitor 1: Positive Terminal
Ground
Device Enable. Logic HIGH: Enabled, Logic LOW: Shutdown.
Input Voltage. Recommended VIN Operating Range = 2.5V to 5.5V.
Voltage Mode Select. Logic HIGH: VOUT = 1.6V, Logic LOW: VOUT = 1.8V
Flying Capacitor 1: Negative Terminal
Flying Capacitor 2: Positive Terminal
Order Information
Output Voltages
1.8V/1.6V
Order Number
LM2773TL
1.8V/1.6V
LM2773TLX
Package Mark ID
XV
DJ
XV
DJ
Package
TLA9ZZA
9-Bump µSMD
Supplied as:
1000 Units, Tape and
Reel
4500 Units, Tape and
Reel
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Absolute Maximum Ratings (Notes 2, 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN Pin Voltage
EN, SEL Pin Voltage
Continuous Power Dissipation
(Note 4)
Junction Temperature (TJ-MAX)
Storage Temperature Range
Maximum Lead Temperature
(Soldering, 10 sec.)
ESD Rating (Note 5)
Human Body Model:
-0.3V to 6.0V
-0.3V to (VIN+0.3V)
w/ 6.0V max
Internally Limited
150°C
-65°C to +150° C
265°C
2.5kV
Operating Ratings
(Notes 2, 3)
Input Voltage Range
Recommended Load Current Range
Junction Temperature (TJ) Range
Ambient Temperature (TA) Range
(Note 6)
Thermal Properties
Junction-to-Ambient Thermal
Resistance (θJA), µSMD-9 Package
(Note 7)
2.5V to 5.5V
0mA to 300mA
-30°C to +110°C
-30°C to +85°C
75°C/W
Electrical Characteristics (Notes 3, 8)
Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the full operating junction temperature range (-30°
C ≤ TJ ≤ +110°C) . Unless otherwise noted, specifications apply to the LM2773 Typical Application Circuit (pg. 1) with: VIN = 3.6V;
V(EN) = 1.8V, V(SEL) = 0V, CIN = C1 = C2 = 1.0µF, COUT = 4.7µF. (Note 10)
Symbol
Parameter
Condition
Min Typ Max Units
VOUT
1.8V Mode Output Voltage
Regulation
1.6V Mode Output Voltage
Regulation
VOUT/IOUT
VOUT/VIN
E
Output Load Regulation
Output Line Regulation
Power Efficiency
IQ Quiescent Supply Current
2.5V ≤ VIN ≤ 5.5V
0mA ≤ IOUT ≤ 300mA
V(SEL) = 1.8V
2.5V ≤ VIN ≤ 5.5V
0mA ≤ IOUT ≤ 300mA
0mA ≤ IOUT ≤ 300mA
IOUT = 300mA
IOUT = 0mA
(Note 11)
1.779
(−2%)
1.815
1.851
(+2%)
1.587
(−2%)
1.619
1.651
(+2%)
V
0.15 mV/mA
0.3 %/V
75 %
48 55
µA
VR
VR–PFM
ISD
FSW
ROL
Fixed Frequency Output Ripple
PFM–Mode Output Ripple
Shutdown Current
Switching Frequency
Open-Loop Output Resistance
IOUT = 300mA
IOUT < 40mA
V(EN) = 0V
3.0V ≤ VIN ≤ 5.5V
IOUT = 300mA
(Note 9)
0.80
10
12
0.1 0.625
1.15 1.50
1.0
mV
mV
µA
MHz
Ω
ICL Output Current Limit
VIN = 5.5V
0V ≤ VOUT ≤ 0.2V
(Note 13)
500 mA
tON Turn-on Time
VIL Logic-low Input Voltage
EN, SEL Pins
2.5V ≤ VIN ≤ 5.5V
EN, SEL Pins
VIH Logic-high Input Voltage 2.5V ≤ VIN ≤ 5.5V
IIH
Logic-high Input Current
V(EN), V(SEL) = 1.8V
(Note 12)
150
0 0.5
1.0 VIN
5
µs
V
V
µA
IIL Logic-low Input Current V(EN), V(SEL) = 0V
0.01 µA
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation
of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions,
see the Electrical Characteristics tables.
Note 3: All voltages are with respect to the potential at the GND pins.
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