LM2587
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SNVS115D –APRIL 2000–REVISED APRIL 2013
Absolute Maximum Ratings(1)(2)
Input Voltage
−0.4V ≤ VIN ≤ 45V
−0.4V ≤ VSW ≤ 65V
Internally Limited
−0.4V ≤ VCOMP ≤ 2.4V
−0.4V ≤ VFB ≤ 2 VOUT
−65°C to +150°C
260°C
Switch Voltage
Switch Current(3)
Compensation Pin Voltage
Feedback Pin Voltage
Storage Temperature Range
Lead Temperature
(Soldering, 10 sec.)
Temperature(4)
Maximum Junction
150°C
(4)
Power Dissipation
Internally Limited
2 kV
Minimum ESD Rating
(C = 100 pF, R = 1.5 kΩ)
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions the
device is intended to be functional, but device parameter specifications may not be ensured under these conditions. For ensured
specifications and test conditions, see the Electrical Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.
(3) Note that switch current and output current are not identical in a step-up regulator. Output current cannot be internally limited when the
LM2587 is used as a step-up regulator. To prevent damage to the switch, the output current must be externally limited to 5A. However,
output current is internally limited when the LM2587 is used as a flyback regulator (see the Application Hints section for more
information).
(4) The junction temperature of the device (TJ) is a function of the ambient temperature (TA), the junction-to-ambient thermal resistance
(θJA), and the power dissipation of the device (PD). A thermal shutdown will occur if the temperature exceeds the maximum junction
temperature of the device: PD × θJA + TA(MAX) ≥ TJ(MAX). For a safe thermal design, check that the maximum power dissipated by the
device is less than: PD ≤ [TJ(MAX) − TA(MAX))]/θJA. When calculating the maximum allowable power dissipation, derate the maximum
junction temperature—this ensures a margin of safety in the thermal design.
Operating Ratings
Supply Voltage
4V ≤ VIN ≤ 40V
0V ≤ VSW ≤ 60V
Output Switch Voltage
Output Switch Current
Junction Temperature Range
ISW ≤ 5.0A
−40°C ≤ TJ ≤ +125°C
LM2587-3.3 Electrical Characteristics
Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 5V.
Symbol
Parameters
Conditions
Typical
Min
Max
Units
SYSTEM PARAMETERS Test Circuit of Figure 7(1)
VOUT
Output Voltage
Line Regulation
Load Regulation
Efficiency
VIN = 4V to 12V
ILOAD = 400 mA to 1.75A
3.3
20
20
75
3.17/3.14
3.43/3.46
50/100
V
ΔVOUT
ΔVIN
/
/
VIN = 4V to 12V
ILOAD = 400 mA
mV
mV
%
ΔVOUT
ΔILOAD
VIN = 12V
ILOAD = 400 mA to 1.75A
50/100
η
VIN = 12V, ILOAD = 1A
UNIQUE DEVICE PARAMETERS(2)
VREF
ΔVREF
GM
Output Reference
Voltage
Measured at Feedback Pin
VCOMP = 1.0V
3.3
2.0
3.242/3.234
3.358/3.366
V
Reference Voltage
Line Regulation
VIN = 4V to 40V
mV
Error Amp
Transconductance
ICOMP = −30 μA to +30 μA
VCOMP = 1.0V
1.193
260
0.678
2.259
mmho
V/V
AVOL
Error Amp
Voltage Gain
VCOMP = 0.5V to 1.6V
151/75
RCOMP = 1.0 MΩ(3)
(1) External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the
LM2587 is used as shown in Figure 7 and Figure 8, system performance will be as specified by the system parameters.
(2) All room temperature limits are 100% production tested, and all limits at temperature extremes are specified via correlation using
standard Statistical Quality Control (SQC) methods.
(3) A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL
.
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