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LM3687 Datasheet(PDF) 5 Page - Texas Instruments

Part # LM3687
Description  Step-Down DC-DC Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3687 Datasheet(HTML) 5 Page - Texas Instruments

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LM3687
www.ti.com
SNVS473B – DECEMBER 2007 – REVISED MAY 2013
Operating Ratings
(1) (2)
Input Voltage Range VBATT
2.7V to 5.5V
(3)
(
≥VOUT_LIN(NOM) + 1.5V and
≥VOUT_DCDC(NOM) + 1.0V)
Input Voltage Range VIN_LIN
(VOUT_LIN(NOM) + 0.25V) to 4.5V
Junction Temperature (TJ) Range
-30°C to + 125°C
Ambient Temperature (TA) Range
-30°C to + 125°C
(4)
(1)
Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under
which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed
performance limits and associated test conditions, see the Electrical Characteristics tables.
(2)
All voltages are with respect to the potential at the SGND pin.
(3)
The battery input voltage range recommended for ideal applications performance for the specified output voltages is given as follows:
VBATT = 2.7V to 5.5V for 1.0V < VOUT_DCDC < 1.8V;
VBATT = (VOUT_DCDC +1V) to 5.5V for 1.8V ≤ VOUT_DCDC ≤ 1.875V
(4)
In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may
have to be derated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP =
125°C), the maximum power dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the
part/package in the application (
θJA), as given by the following equation: TA-MAX = TJ-MAX-OP – (θJA × PD-MAX).
Thermal Properties
Junction-to-Ambient Thermal Resistance (
θJA), for 4 layer board
(1)
DSBGA 9
70°C/W
(1)
Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power
dissipation exists, special attention must be paid to thermal dissipation issues in board design.
Electrical Characteristics: DC-DC Converter
(1) (2) (3)
Typical values and limits appearing in standard typeface are for TA = 25°C. Limits appearing in boldface type apply over the
full operating temperature range: -30°C
≤ TJ ≤ +125°C. Unless otherwise noted, VIN_LIN = VOUT_LIN(NOM) + 0.3V, VBATT = 3.6V,
IOUT_LIN = 1mA, VEN_DCDC = VEN_LIN = VBATT, CVBATT = 4.7µF, CVOUT_DCDC = 10µF, CVOUT_LIN = 2.2µF, CVIN_LIN = 1.0µF, L = 2.2µH.
Symbol
Parameter
Conditions
Typical
Limit
Units
Min
Max
VFB_DCDC
Feedback Voltage
PWM Mode
-2.5
+2.5
%
Accuracy
Line Regulation
VOUT_DCDC + 1.0V ≤ VBATT ≤ 5.5V, IOUT_DCDC =
0.06
%/V
150mA
Load Regulation
100mA
≤ IOUT_DCDC ≤ 750mA
0.0005
%/mA
RDSON(P)
Pin-Pin Resistance for
280
500
m
PFET
RDSON(N)
Pin-Pin Resistance for
200
400
m
NFET
ILIM_DCDC
Switch Peak Current
Open loop (4)
1172
994
1380
mA
Limit
FOSC
Internal Oscillator
PWM Mode
1.8
1.3
2.3
MHz
Frequency
(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 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)
Refer to datasheet curves for closed loop data and its variation with regards to supply voltage and temperature. Electrical Characteristic
table reflects open loop data (FB=0V and current drawn from SW pin ramped up until cycle by cycle current limit is activated). Closed
loop current limit is the peak inductor current measured in the application circuit by increasing output current until output voltage drops
by 10%.
Copyright © 2007–2013, Texas Instruments Incorporated
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