Datasheet

LM2587
www.ti.com SNVS115D –APRIL 2000–REVISED APRIL 2013
LM2587-ADJ 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 8
(1)
V
OUT
Output Voltage V
IN
= 4V to 10V 12.0 11.52/11.40 12.48/12.60 V
I
LOAD
= 300 mA to 1.2A
ΔV
OUT
/ Line Regulation V
IN
= 4V to 10V 20 100/200 mV
ΔV
IN
I
LOAD
= 300 mA
ΔV
OUT
/ Load Regulation V
IN
= 10V 20 100/200 mV
ΔI
LOAD
I
LOAD
= 300 mA to 1.2A
η Efficiency V
IN
= 10V, I
LOAD
= 1A 90 %
UNIQUE DEVICE PARAMETERS
(2)
V
REF
Output Reference Measured at Feedback Pin 1.230 1.208/1.205 1.252/1.255 V
Voltage V
COMP
= 1.0V
ΔV
REF
Reference Voltage V
IN
= 4V to 40V 1.5 mV
Line Regulation
G
M
Error Amp I
COMP
= −30 μA to +30 μA 3.200 1.800 6.000 mmho
Transconductance V
COMP
= 1.0V
A
VOL
Error Amp V
COMP
= 0.5V to 1.6V 670 400/200 V/V
Voltage Gain R
COMP
= 1.0 MΩ
(3)
I
B
Error Amp V
COMP
= 1.0V 125 425/600 nA
Input Bias Current
(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
.
All Output Voltage Versions Electrical Characteristics
(1)
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
I
S
Input Supply Current (Switch Off) 11 15.5/16.5 mA
See
(2)
I
SWITCH
= 3.0A 85 140/165 mA
V
UV
Input Supply R
LOAD
= 100Ω 3.30 3.05 3.75 V
Undervoltage Lockout
f
O
Oscillator Frequency Measured at Switch Pin
R
LOAD
= 100Ω 100 85/75 115/125 kHz
V
COMP
= 1.0V
f
SC
Short-Circuit Measured at Switch Pin
Frequency R
LOAD
= 100Ω 25 kHz
V
FEEDBACK
= 1.15V
V
EAO
Error Amplifier Upper Limit 2.8 2.6/2.4 V
Output Swing See
(3)
Lower Limit 0.25 0.40/0.55 V
See
(2)
I
EAO
Error Amp See
(4)
Output Current 165 110/70 260/320 μA
(Source or Sink)
(1) 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.
(2) To measure this parameter, the feedback voltage is set to a high value, depending on the output version of the device, to force the error
amplifier output low. Adj: V
FB
= 1.41V; 3.3V: V
FB
= 3.80V; 5.0V: V
FB
= 5.75V; 12V: V
FB
= 13.80V.
(3) To measure this parameter, the feedback voltage is set to a low value, depending on the output version of the device, to force the error
amplifier output high. Adj: V
FB
= 1.05V; 3.3V: V
FB
= 2.81V; 5.0V: V
FB
= 4.25V; 12V: V
FB
= 10.20V.
(4) To measure the worst-case error amplifier output current, the LM2587 is tested with the feedback voltage set to its low value (specified
in Note 7) and at its high value (specified in Note 8).
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