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LM2771 датащи(PDF) 3 Page - Texas Instruments

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номер детали LM2771
подробное описание детали  Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

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LM2771
www.ti.com
SNVS435 – MARCH 2006
Operating Ratings
(1) (2)
Input Voltage Range
2.7V to 5.5V
Recommended Load Current Range
0mA to 250mA
Junction Temperature (TJ) Range
-30°C to +110°C
Ambient Temperature (TA) Range
(3)
-30°C to +85°C
(1)
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.
(2)
All voltages are with respect to the potential at the GND pins.
(3)
Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 110ºC), the
maximum power dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the part/package
in the application (
θJA), as given by the following equation: TA-MAX = TJ-MAX-OP – (θJA × PD-MAX).
Thermal Properties
Junction-to-Ambient Thermal Resistance (
θJA), WSON-10 Package
(1)
55°C/W
(1)
Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power
dissipation exists, special care must be paid to thermal dissipation issues.
Electrical Characteristics
(1) (2)
Limits in standard typeface are for TJ = 25ºC. Limits in boldface type apply over the full operating junction temperature range
(-30°C
≤ TJ ≤ +110°C) . Unless otherwise noted, specifications apply to the LM2771 Typical Application Circuit (pg. 1) with:
VIN = 3.6V; V(EN) = 1.8V, CIN = C1 = 1.0µF, COUT = 4.7µF.
(3)
Symbol
Parameter
Condition
Min
Typ
Max
Units
3.0V
≤ VIN ≤ 5.5V
1.455
1.545
1.5
0mA
≤ IOUT ≤ 200mA
(
−3%)
(+3%)
3.0V
≤ VIN ≤ 5.5V
1.475
1.525
VOUT
1.5V Output Voltage Regulation
1.5
V
IOUT = 150mA
(
−1.7%)
(+1.7%)
3.0V < VIN ≤ 5.5V,
1.445
1.545
1.5
0mA
≤ IOUT ≤ 250mA
(
−3.7%)
(+3%)
VOUT = 1.5V
VOUT/IOUT
Output Load Regulation
0.17
mV/mA
0mA
≤ IOUT ≤ 250mA
VOUT/VIN
Output Line Regulation
0.1
%/V
E
Power Efficiency
IOUT = 200mA
81
%
IQ
Quiescent Supply Current
IOUT = 0mA
(4)
45
50
µA
VR
Fixed Frequency Output Ripple
40mA
≤ IOUT ≤ 250mA
8
mV
VR–PFM
PFM–Mode Output Ripple
IOUT < 40mA
12
mV
ISD
Shutdown Current
V(EN) = 0V
0.1
0.5
µA
FSW
Switching Frequency
3.2V
≤ VIN ≤ 5.5V
0.80
1.1
1.40
MHz
ROL
Open–Loop Output Resistance
IOUT = 200mA
(5)
1.0
VIN = 5.5V
ICL
Output Current Limit
500
mA
0V
≤ VOUT ≤ 0.2V
(6)
tON
Turn-on Time
150
µs
VIL
Logic-low Input Voltage
3.0V
≤ VIN ≤ 5.5V
0
0.5
V
VIH
Logic-high Input Voltage
3.0V
≤ VIN ≤ 5.5V
0.95
VIN
V
IIH
Logic-high Input Current
V(EN) = 1.8V(7)
5
µA
IIL
Logic-low Input Current
Logic Input = 0V
0.1
µA
(1)
All voltages are with respect to the potential at the GND pins.
(2)
Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the
most likely norm.
(3)
CIN, COUT, C1: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.
(4)
VOUT is set to 1.6V during this test.
(5)
Open loop output resistance can be used to predict output voltage when, under low VIN and high IOUT conditions, VOUT falls out of
regulation. VOUT = VIN/2 − (ROL × IOUT)
(6)
Maximum input current is equal to half the maximum output current for buck-mode switched capacitor converters.
(7)
There is a 350k
Ω pull-down resistor connected internally between the EN pin and GND.
Copyright © 2006, Texas Instruments Incorporated
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