Datasheet

LM2586
www.ti.com SNVS121D –MAY 1996–REVISED APRIL 2013
LM2586-ADJ
Symbol Parameters Conditions Typical Min Max Units
SYSTEM PARAMETERS Test Circuit of Figure 21
(1)
V
OUT
Output Voltage V
IN
= 4V to 10V
12.0 11.52/11.40 12.48/12.60 V
I
LOAD
= 0.2A to 0.8A
ΔV
OUT
/ Line Regulation V
IN
= 4V to 10V
20 100/200 mV
ΔV
IN
I
LOAD
= 0.2A
ΔV
OUT
/ Load Regulation V
IN
= 10V
20 100/200 mV
ΔI
LOAD
I
LOAD
= 0.2A to 0.8A
η Efficiency V
IN
= 10V, I
LOAD
= 0.6A 93 %
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 Voltage Gain V
COMP
= 0.5V to 1.6V,
670 400/200 V/V
R
COMP
= 1.0 MΩ
(3)
I
B
Error Amp V
COMP
= 1.0V
125 425/600 nA
Input Bias Current
COMMON DEVICE PARAMETERS for all versions
(2)
I
S
Input Supply Current Switch Off
(4)
11 15.5/16.5 mA
I
SWITCH
= 1.8A 50 100/115 mA
I
S/D
Shutdown Input V
SH
= 3V
16 100/300 μA
Supply Current
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, V
COMP
= 1.0V 100 85/75 115/125 kHz
Freq. Adj. Pin Open (Pin 1)
R
SET
= 22 kΩ 200 kHz
f
SC
Short-Circuit Measured at Switch Pin
Frequency R
LOAD
= 100Ω 25 kHz
V
FEEDBACK
= 1.15V
V
EAO
Error Amplifier Upper Limit
(5)
2.8 2.6/2.4 V
Output Swing
Lower Limit
(4)
0.25 0.40/0.55 V
I
EAO
Error Amp See
(6)
Output Current 165 110/70 260/320 μA
(Source or Sink)
I
SS
Soft Start Current V
FEEDBACK
= 0.92V
11.0 8.0/7.0 17.0/19.0 μA
V
COMP
= 1.0V
D
MAX
Maximum Duty Cycle R
LOAD
= 100Ω
(5)
98 93/90 %
I
L
Switch Leakage Switch Off
15 300/600 μA
Current V
SWITCH
= 60V
V
SUS
Switch Sustaining Voltage dV/dT = 1.5V/ns 65 V
V
SAT
Switch Saturation Voltage I
SWITCH
= 3.0A 0.45 0.65/0.9 V
(1) External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the
LM2586 is used as shown in Figure 20 and Figure 21, 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
.
(4) 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 and the switch off.
(5) 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 and the switch on.
(6) To measure the worst-case error amplifier output current, the LM2586 is tested with the feedback voltage set to its low value (Note 4)
and at its high value (Note 5).
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