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LM3686 Datasheet(PDF) 8 Page - Texas Instruments

No. de pieza LM3686
Descripción Electrónicos  Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator
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Fabricante Electrónico  TI1 [Texas Instruments]
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LM3686 Datasheet(HTML) 8 Page - Texas Instruments

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LM3686
SNVS520D – AUGUST 2008 – REVISED MARCH 2011
www.ti.com
Electrical Characteristics
(1) (2) (3) (4) Linear Regulator — LDO
Typical Limit
Symbol
Parameter
Conditions
Units
Min
Typ
Max
VIN_LDO
LDO input voltage range
2.7
5.5
V
Output voltage
2.744
2.8
2.856
ΔVOUT_LDO/VOUT_
VIN = 3.6V
accuracy,
V
LDO
IOUT_LDO = 1 mA & 300 mA
2.94
3.0
3.06
VOUT_LDO
ΔVOUT_LDO/ΔmA
Load regulation(5)
IOUT_LDO = 1 mA & 300 mA
8
µV/mA
ΔVIN_LDO/ΔVBATT
Line regulation(6)
VIN_LDO = (VOUT_LDO(NOM) + 0.3V) to
0.2
mV/V
5.5V
VDROP
Dropout voltage(7)
IOUT = 300 mA
120
200
mV
IQ
Quiescent current
Ven = 0.95V, IOUT = 0 mA
50
80
µA
ISC-LDO
Short circuit current limit
VOUT = GND
350
mA
System Characteristic (8)
PSRR
Power supply rejection
EN_DC = EN_LILO = GND
85
ratio
f = 1 kHz, IOUT = 200 mA
dB
f = 10 kHz, IOUT = 200 mA
70
Signal to VIN_LDO = 3.6V
Output noise voltage (9)
BW = 10 Hz to 100 kHz,
eN_LDO
VIN_LDO = 3.6V
6.7
µVRMS
IOUT = 200 mA
Dynamic line transient
VIN_LDO = 3.8V to 4.4V
ΔVIN_LDO
response
tr, tf = 30 µs
+/-2
mV
IOUT = 1 mA
Dynamic load transient
Pulsed load 1 mA & 300 mA
ΔVOUT_LDO
+/-30
mV
response
tr, tf = 10 µs
(1)
All voltages are with respect to the potential at the GND pin.
(2)
Min and Max limits are guaranteed by design, test, or statistical analysis. Typical (typ.) numbers are not guaranteed, but do represent
the most likely norm. Unless otherwise specified, conditions for typ. specifications are: VBATT = 3.6V and TA = 25°C.
(3)
The parameters in the electrical characteristic table are tested at VBATT = 3.6V unless otherwise specified. For performance over the
input voltage range refer to datasheet curves.
(4)
The input voltage range recommended for ideal applications performance for the specified output voltages is given below:VBATT = 2.7V
to 5.5V for 1.0V
≤ VOUT_DCDC < 1.8VVBATT = (VOUT_DCDC + 1V) to 5.5V for 1.8V ≤ VOUT_DCDC < 3.6V
(5)
To calculate the output voltage from the load regulation specified, use the following equation:
ΔVOUT = Load Regulation (%/mA) x
Nominal VOUT (V) x ΔIOUT (mA).
(6)
To calculate the output voltage from the line regulation specified, use the following equation:
ΔVOUT = Line Regulation (%/V) x Nominal
VOUT (V) x ΔVIN (V).
(7)
Dropout voltage is defined as the input to output voltage differential at which the output voltage falls to 100 mV below the nominal output
voltage.
(8)
Parameters guaranteed by design.
(9)
The noise performance target is applied to PWM mode operation and this does not apply when DCDC converter is operating in PFM
mode.
8
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Product Folder Links: LM3686


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