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LM3280 датащи(PDF) 4 Page - Texas Instruments

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номер детали LM3280
подробное описание детали  Adjustable Step-Down DC-DC Converter and 3 LDOs for RF Power Management
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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LM3280 датащи(HTML) 4 Page - Texas Instruments

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LM3280
SNOSAU4B – OCTOBER 2006 – REVISED FEBRUARY 2013
www.ti.com
General 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, specifications apply to the LM3280 with: VIN = ( SVIN = PVIN = )
3.6V, ENBUCK = 3.6V, ENLDO1 = ENLDO2 = ENLDO3 = BYP = 0V, FB = 2V, VCON = 0.267V.
Symbol
Parameter
Conditions
Min.
Typ.
Max
Units
IQ
Shutdown Supply Current
ENBUCK = 0V,
0.1
3
µA
FB = SW = VCON = 0V,
BYPOUT = 0V
No Load Supply Current
ENBUCK = 3.6V,
720
800
µA
BYPOUT = 0V
ENBUCK = 3.6V,
920
1300
µA
BYPOUT = 0V,
ENLDO1 = 3.6V
ENBUCK = BYP = 3.6V
720
800
µA
ENBUCK = BYP = 3.6V,
920
1300
µA
ENLDO1 = 3.6V
VIH
Logic High Input Threshold Voltage for
FB = 0V
1.2
V
ENx, BYP
VIL
Logic Low Input Threshold Voltage for
FB = 0V
0.4
V
ENx, BYP
IPDWN
Logic Input Pull Down Current for ENx,
ENx, BYP = 3.6V
5
10
µA
BYP
THSD
Thermal Shutdown Temperature
(2)
150
°C
Hysteresis Temperature
(2)
25
°C
(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)
The LM3280 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.
Buck 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, specifications apply to the LM3280 with: VIN = ( SVIN = PVIN = )
3.6V, ENBUCK = 3.6V, ENLDO1 = ENLDO2 = ENLDO3 = BYP = 0V, FB = 2V, VCON = 0.267V.
Symbol
Parameter
Conditions
Min.
Typ.
Max
Units
VFB_ MIN
Feedback Voltage at Minimum Setting
VCON = 0.267V
0.75
0.800
0.85
V
VFB_ MAX
Feedback Voltage at Maximum Setting
VCON = 1.20V, VIN = 4.2V
3.528
3.600
3.672
V
OVP
Over-Voltage Protection Threshold
(4)
330
400
mV
VBYPASS−
Auto Bypass Detection Negative
(5)
160
250
320
mV
Threshold
VBYPASS+
Auto Bypass Detection Positive
(5)
350
450
540
mV
Threshold
RDSON (P)
Pin-Pin Resistance for PFET
ISW = 500mA, FB = 0V
320
450
m
RDSON (N)
Pin-Pin Resistance for N-FET
ISW = - 200mA
310
450
m
RDSON (BYP) Pin-Pin Resistance for Bypass FET
IBYPOUT = 500mA
85
120
m
(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)
Shutdown current includes leakage current of PFET and Bypass FET.
(4)
Over-Voltage protection (OVP) threshold is the voltage above the nominal VOUT where the OVP comparator turns off the PFET switch
while in PWM mode.
(5)
SVIN is compared to the programmed output voltage (VOUT). When SVIN – VOUT falls below VBYPASS− for longer than TBYP the Bypass
FET turns on and the switching FETs turn off. This is called the Bypass mode. The device comes out of Bypass mode when SVIN –
VOUT exceeds VBYPASS
+ for longer than T
BYP, and PWM mode returns. The hysteresis for the bypass detection threshold VBYPASS
+
VBYPASS− will always be positive and will be approximately 200mV (typ.).
4
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