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LM3218 데이터시트(PDF) 4 Page - Texas Instruments

부품명 LM3218
상세설명  Miniature, Adjustable, Step-Down DC-DC Converter
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LM3218 데이터시트(HTML) 4 Page - Texas Instruments

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LM3218
SNOSB11B – MARCH 2008 – REVISED MARCH 2013
www.ti.com
ELECTRICAL CHARACTERISTICS
(1) (2) (3)
Limits in standard typeface are for TA = TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature
range (
−30°C ≤ TA = TJ ≤ +85°C). Unless otherwise noted, all specifications apply to the LM3218 with: PVIN = VDD = EN =
3.6V.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VFB, MIN
Feedback voltage at minimum
VCON = 0.32V VIN = 3.6V
(3)
0.75
0.80
0.85
V
setting
VFB, MAX
Feedback voltage at maximum
VCON = 1.44V, VIN = 4.2V
(3)
3.526
3.600
3.696
V
setting
ISHDN
Shutdown supply current
EN = VOUT = VCON = 0V,
(4)
0.01
2
µA
IQ
DC bias current into VDD
VCON = 0V, FB = 0V,
0.6
0.7
mA
No Switching(5)
RDROPOU PinVout - PinVin resistance
IOUT = 200mA, VCON = 0.5V
300
400
m
T
ILIM
Large PFET (L) Switch peak
VCON = 0.5V
(6)
(L_PFET
current limit
1100
mA
)
ILIM
Small PFET (S) Switch peak
VCON = 0.32V
(6)
(S_PFET
current limit
800
mA
)
FOSC
Internal oscillator frequency
2.0
MHz
VIH,ENABL Logic high input threshold
1.2
V
E
VIL,ENABL
Logic low input threshold
0.5
V
E
IPIN,ENABL Pin pull down current
EN = 3.6V
5
10
µA
E
VCON,ON
VCON Threshold for turning on
0.15
V
switches
ICON
VCON pin leakage current
VCON = 1.0V
±1
µA
Gain
VCON to VOUT Gain
0.32V
≤ VCON ≤ 1.44V
2.5
V/V
(1)
All voltages are with respect to the potential at the GND pins. The LM3218 is designed for mobile phone applications where turn-on after
power-up is controlled by the system controller and where requirements for a small package size overrule increased die size for internal
Under Voltage Lock-Out (UVLO) circuitry. Thus, it should be kept in shutdown by holding the EN pin low until the input voltage exceeds
2.7V.
(2)
Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not specified, but do represent the most
likely norm. Due to the pulsed nature of the testing TA = TJ for the electrical characteristics table.
(3)
The parameters in the electrical characteristics table are tested under open loop conditions at PVIN = VDD = 3.6V unless otherwise
specified. For performance over the input voltage range and closed-loop results, refer to the datasheet curves.
(4)
Shutdown current includes leakage current of PFET.
(5)
IQ specified here is when the part is not switching. For operating quiescent current at no load, refer to datasheet curves.
(6)
Current limit is built-in, fixed, and not adjustable. Electrical Characteristic table reflects open loop data (FB = 0V and current drawn from
SW pin ramped up until cycle by cycle limit is activated). Refer to System Characteristics table for maximum output current.
4
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