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LM3687 Datasheet(PDF) 6 Page - Texas Instruments

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Part No. LM3687
Description  Step-Down DC-DC Converter
Download  30 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3687 Datasheet(HTML) 6 Page - Texas Instruments

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LM3687
SNVS473B – DECEMBER 2007 – REVISED MAY 2013
www.ti.com
Electrical Characteristics: Linear Regulator, Normal Mode
(1) (2)
Symbol
Parameter
Condition
Typ
Limit
Units
Min
Max
ΔVOUT_LIN /
Output Voltage
-1.5
1.5
%
In startup and normal mode
VOUT_LIN(NOM)
Accuracy
-2.0
2.0
%
ΔVOUT_LIN /
VIN_LIN = VOUT_LIN(NOM) + 0.3V to
0.3
1
mV/V
ΔVIN_LIN
4.5V, VBATT = 4.5V
Line Regulation Error
ΔVOUT_LIN /
VBATT = VOUT_LIN(NOM) + 1.5V (≥2.7V)
0.5
3.1
ΔVBATT
to 5.5V
ΔVOUT_LIN / ΔmA
Load Regulation Error
IOUT_LIN = 1mA to 350mA
10
60
µV/mA
VDO_VIN_LIN
IOUT_LIN = 350mA ,
VBATT = VOUT_LIN(NOM) + 1.5V (≥2.7V)
85
200
mV
Output Voltage Dropout
(3) (4)
IOUT_LIN = 150mA ,
VBATT = VOUT_LIN(NOM) + 1.3V (≥2.7V)
42
100
mV
IQ_VIN_LIN
Quiescent Current into
IOUT_LIN = 0mA
10
28
µA
VIN_LIN
Shutdown Current into
VEN_LIN = 0V
0.1
1
µA
VIN_LIN
ISC_LIN
Output Current
VOUT_LIN = 0V
500
350
mA
(short circuit)
PSRR
Sine modulated VBATT,
f = 10Hz
70
dB
f = 100Hz
65
f = 1kHz
45
Power Supply
Sine modulated VIN
Rejection Ratio
f = 10Hz
80
f = 100Hz
90
dB
f = 1kHz
95
f = 10kHz
85
EN
Output Noise linear
10Hz - 100kHz
100
µVRMS
regulator
ΔVOUT_LIN
VIN_LIN = VOUT_LIN(NOM) + 0.3V to
±1
mVp
Dynamic line transient
VOUT_LIN(NOM) + 0.9V
response VIN_LIN
tr, tf = 10µs
VBATT = VOUT_LIN(NOM) + 1.5V to
±15
mVp
Dynamic line transient
VOUT_LIN(NOM) + 2.1V
response VBATT
tr, tf = 10µs
ΔVOUT_LIN
Dynamic load transient
Pulsed load 0 ... 350mA
±30
mVp
response
di/dt = 350mA/1µs
(1)
All voltages are with respect to the potential at the SGND pin.
(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. Unless otherwise specified, conditions for typ. specifications are: VBATT = 3.6V and TA = 25°C.
(3)
Dropout voltage is defined as the input to output voltage differential at which the output voltage falls to 100mV below the nominal output
voltage.
(4)
This specification does not apply if the battery voltage VBATT needs to be decreased below the minimum operating limit of 2.7V.
Electrical Characteristics: Startup LDO
(1) (2)
Symbol
Parameter
Conditions
Typical
Limit
Units
Min
Max
IOUT
Rated output current
50
mA
Output Current (short
VOUT_LIN = 0V
100
50
mA
ISC_LIN
circuit)
(1)
All voltages are with respect to the potential at the SGND pin.
(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. Unless otherwise specified, conditions for typ. specifications are: VBATT = 3.6V and TA = 25°C.
6
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Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: LM3687


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