LM2750LD-5.0 PDF даташит
Спецификация LM2750LD-5.0 изготовлена «National Semiconductor» и имеет функцию, называемую «Low Noise/ 5.0V Regulated Switched Capacitor Voltage Converter». |
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Детали детали
Номер произв | LM2750LD-5.0 |
Описание | Low Noise/ 5.0V Regulated Switched Capacitor Voltage Converter |
Производители | National Semiconductor |
логотип |
11 Pages
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February 2003
LM2750
Low Noise, 5.0V Regulated Switched Capacitor Voltage
Converter
General Description
The LM2750 is a switched-capacitor doubler that produces a
low-noise, well regulated, 5.0V output. It can supply up to
120mA of output current over a 2.9V to 5.6V input range, as
well as up to 40mA of output current when the input voltage
is as low as 2.7V. The LM2750 has been placed in National’s
10-pin LLP, a package with excellent thermal properties that
keeps the part from overheating under almost all rated op-
erating conditions
A perfect fit for space-constrained, battery-powered applica-
tions, the LM2750 requires only 3 external components: one
input capacitor, one output capacitor, and one flying capaci-
tor. Small, inexpensive ceramic capacitors are recom-
mended for use. These capacitors, in conjunction with the
1.7MHz fixed switching frequency of the LM2750, yield low
output voltage ripple, beneficial for systems requiring a low-
noise 5V supply. Pre-regulation minimizes input current
ripple, reducing input noise to negligible levels.
A tightly controlled soft-start feature limits inrush currents
during part activation. Shutdown completely disconnects the
load from the input. Output current limiting and thermal
shutdown circuitry protect both the LM2750 and connected
devices in the event of output shorts or excessive current
loads.
Features
n Inductorless solution: Application requires only 3 small
ceramic capacitors
n Low Noise, 5.0V ± 4% Regulated Output
n 85% Peak Efficiency
70% Average Efficiency over Li-Ion Input Range
(2.9V-to-4.2V)
n Output Current up to 120mA with 2.9V ≤ VIN ≤ 5.6V
Output Current up to 40mA with 2.7V ≤ VIN ≤ 2.9V
n Wide Input Voltage Range: 2.7V to 5.6V
n Fixed 1.7MHz switching frequency for a low-noise,
low-ripple output signal
n Pre-regulation minimizes input current ripple, keeping
the battery line (VIN) virtually noise-free
n Tiny LLP package with outstanding power dissipation:
Usually no derating required.
n Shutdown Supply Current less than 2µA
Applications
n White and Colored LED-based Display Lighting
n Cellular Phone SIM cards
n Audio Amplifier Power Supplies
n General Purpose Li-Ion-to-5V Conversion
Typical Application Circuit
© 2003 National Semiconductor Corporation DS200351
20035101
www.national.com
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Connection Diagram
LM2750
10-Pin Leadless Leadframe Package (LLP) - 3mm X 3mm
NS Package Number LDA10A
Top View
20035102
Pin Description
Pin #(s)
8, 9
1, 2
10
7
4
3, 5, 6, DAP
Pin Name
VIN
VOUT
CAP+
CAP-
SD
GND
Description
Input Voltage - The pins must be connected externally.
Output Voltage - These pins must be connected externally.
Flying Capacitor Positive Terminal
Flying Capacitor Negative Terminal
Active-Low Shutdown Input. A 200kΩ resistor is connected internally between
this pin and GND to pull the voltage on this pin to 0V, and shut down the part,
when the pin is left floating.
Ground - These pins must be connected externally.
Ordering Information
Output Voltage
Option
5.0
5.0
Ordering
Information
LM2750LD-5.0
LM2750LDX-5.0
Package Marking
Supplied as
S002B
S002B
1000 Units, Tape and Reel
4500 Units, Tape and Reel
www.national.com
2
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Absolute Maximum Ratings (Notes 1,
2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN Pin: Voltage to Ground
SD Pin: Voltage to GND
Junction Temperature (TJ-MAX-ABS)
Continuous Power Dissipation
(Note 3)
Storage Temperature Range
Maximum Lead Temperature
(Soldering, 5 sec.)
ESD Rating (Note 4)
Human-body model:
Machine model
−0.3V to 6V
−0.3V to
(VIN+0.3V)
150˚C
Internally Limited
−65˚C to 150˚C
260˚C
2 kV
100V
Operating Ratings (Notes 1, 2)
Input Voltage Range
Recommended Output Current
2.9V ≤ VIN ≤ 5.6V
2.7V ≤ VIN ≤ 2.9V
Junction Temperature (TJ) Range
Ambient Temperature (TA) Range
(Note 5)
2.7V to 5.6V
0 to 120mA
0 to 40mA
-40˚C to 125˚C
-40˚C to 85˚C
Thermal Information
Junction-to-Ambient Thermal
Resistance, LLP-10
Package (θJA) (Note 6)
55˚C/W
Electrical Characteristics (Notes 2, 7)
Typical values and limits in standard typeface apply for TJ = 25oC. Limits in boldface type apply over the operating junction
temperature range. Unless otherwise specified: 2.9V ≤ VIN ≤ 5.6V, V(SD) = VIN, CFLY = 1µF, CIN = 2 x 1µF, COUT = 2 x 1µF
(Note 8).
Symbol
Parameter
Conditions
Min Typ Max Units
VOUT
IQ
ISD
VR
EPEAK
EAVG
fSW
tON
Output Voltage
Operating Supply Current
Shutdown Supply Current
Output Ripple
Peak Efficiency
Average Efficiency over Li-Ion
Input Range (Note 10)
Switching Frequency
VOUT Turn-On Time
2.9V ≤ VIN ≤ 5.6V,
IOUT ≤ 120mA
2.7V ≤ VIN ≤ 2.9V,
IOUT ≤ 40mA
IOUT = 0mA,
VIH(MIN) ≤ V(SD) ≤VIN
V(SD) = 0V
COUT = 10µF, IOUT = 100mA
COUT=2.2µF, IOUT = 100mA
VIN = 2.7V, IOUT = 40mA
VIN = 2.9V, IOUT = 120mA
VIN Range: 2.9V - 4.2V,
IOUT = 120mA
VIN Range: 2.9V - 4.2V,
IOUT = 40mA
VIN= 3.0V, IOUT = 100mA,
(Note 9)
4.80 5.0 5.20
(-4%)
(+4%)
V
4.80 5.0 5.20 (%)
(-4%)
(+4%)
5 10 mA
12
2 µA
4
mVp-p
15
87 %
85
70 %
67
1.0 1.7
0.5
MHz
ms
ILIM Current Limit
Shutdown Pin (SD) Characteristics
VOUT shorted to GND
300 mA
VIH Logic-High SD Input
VIL Logic-Low SD Input
IIH SD Input Current (Note 11)
IIL SD Input Current
Capacitor Requirements
1.3V ≤ V(SD) ≤ VIN
V(SD) = 0V
1.3 VIN V
0 0.4 V
15 50 µA
−1 1 µA
CIN
COUT
Required Input
Capacitance(Note 12)
Required Output
Capacitance(Note 12)
IOUT ≤ 60mA
60mA ≤ IOUT ≤ 120mA
IOUT ≤ 60mA
60mA ≤ IOUT ≤ 120mA
1.0
2.0
1.0
2.0
µF
µF
3 www.national.com
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Номер в каталоге | Описание | Производители |
LM2750LD-5.0 | Low Noise/ 5.0V Regulated Switched Capacitor Voltage Converter | National Semiconductor |
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