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LM3687 Fiches technique(PDF) 7 Page - Texas Instruments

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No de pièce LM3687
Description  Step-Down DC-DC Converter
Download  30 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM3687 Fiches technique(HTML) 7 Page - Texas Instruments

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LM3687
www.ti.com
SNVS473B – DECEMBER 2007 – REVISED MAY 2013
Electrical Characteristics: System Parameters Supply
(1) (2)
Limit
Symbol
Parameter
Conditions
Typical
Units
Min
Max
IQ_VBATT
Quiescent current into
EN_LIN = low, EN_DCDC = high, IOUT_DCDC =
VBATT
IOUT_LIN = 0mA, DC-DC is not switching
27
60
µA
(FB_DCDC forced higher than VOUT_DCDC)
EN_LIN = high, EN_DCDC = low
55
µA
EN_LIN = EN_DCDC = high
65
µA
Shutdown current into
VEN_DCDC = VEN_LIN = 0V
0.1
5
µA
VBATT
-30°C
≤ TJ ≤ +85°C
(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.
Electrical Characteristics: Under-Voltage Protection
(1) (2)
Symbol
Parameter
Conditions
Typical
Limit
Units
Min
Max
VBATT_UVP
Under-Voltage Lockout
2.41
V
VBATT_EN
System Enable Voltage
2.65
V
(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.
Electrical Characteristics: Enable Pins (EN_DCDC, EN_LIN)
(1) (2)
Limit
Symbol
Parameter
Conditions
Typical
Units
Min
Max
Enable pin input
IEN
0.01
1
µA
current
Logic High voltage
VIH
1.0
V
level
VIL
Logic Low voltage level
0.4
V
(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.
Electrical Characteristics: Thermal Protection
(1) (2)
Limit
Symbol
Parameter
Conditions
Typical
Units
Min
Max
Thermal-Shutdown
TSHDN
(3)
160
°C
Temperature
Thermal-Shutdown
ΔTSHDN
20
°C
Hysteresis
(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)
The DC-DC converter will only enter thermal shutdown from PWM mode. At light loads -present for PFM mode- no significant
contribution to the power dissipation is added by the DC-DC converter.
Copyright © 2007–2013, Texas Instruments Incorporated
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