Datasheet

LM2587
www.ti.com SNVS115D –APRIL 2000–REVISED APRIL 2013
Absolute Maximum Ratings
(1)(2)
Input Voltage −0.4V ≤ V
IN
≤ 45V
Switch Voltage −0.4V ≤ V
SW
≤ 65V
Switch Current
(3)
Internally Limited
Compensation Pin Voltage −0.4V ≤ V
COMP
≤ 2.4V
Feedback Pin Voltage −0.4V ≤ V
FB
≤ 2 V
OUT
Storage Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 10 sec.) 260°C
Maximum Junction Temperature
(4)
150°C
Power Dissipation
(4)
Internally Limited
Minimum ESD Rating (C = 100 pF, R = 1.5 kΩ) 2 kV
(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 (T
J
) is a function of the ambient temperature (T
A
), the junction-to-ambient thermal resistance
(θ
JA
), and the power dissipation of the device (P
D
). A thermal shutdown will occur if the temperature exceeds the maximum junction
temperature of the device: P
D
× θ
JA
+ T
A(MAX)
≥ T
J(MAX)
. For a safe thermal design, check that the maximum power dissipated by the
device is less than: P
D
≤ [T
J(MAX)
− T
A(MAX)
)]/θ
JA
. 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 ≤ V
IN
≤ 40V
Output Switch Voltage 0V ≤ V
SW
≤ 60V
Output Switch Current I
SW
≤ 5.0A
Junction Temperature Range −40°C ≤ T
J
≤ +125°C
LM2587-3.3 Electrical Characteristics
Specifications with standard type face are for T
J
= 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, V
IN
= 5V.
Symbol Parameters Conditions Typical Min Max Units
SYSTEM PARAMETERS Test Circuit of Figure 7
(1)
V
OUT
Output Voltage V
IN
= 4V to 12V 3.3 3.17/3.14 3.43/3.46 V
I
LOAD
= 400 mA to 1.75A
ΔV
OUT
/ Line Regulation V
IN
= 4V to 12V 20 50/100 mV
ΔV
IN
I
LOAD
= 400 mA
ΔV
OUT
/ Load Regulation V
IN
= 12V 20 50/100 mV
ΔI
LOAD
I
LOAD
= 400 mA to 1.75A
η Efficiency V
IN
= 12V, I
LOAD
= 1A 75 %
UNIQUE DEVICE PARAMETERS
(2)
V
REF
Output Reference Measured at Feedback Pin 3.3 3.242/3.234 3.358/3.366 V
Voltage V
COMP
= 1.0V
ΔV
REF
Reference Voltage V
IN
= 4V to 40V 2.0 mV
Line Regulation
G
M
Error Amp I
COMP
= −30 μA to +30 μA 1.193 0.678 2.259 mmho
Transconductance V
COMP
= 1.0V
A
VOL
Error Amp V
COMP
= 0.5V to 1.6V 260 151/75 V/V
Voltage Gain R
COMP
= 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 A
VOL
.
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