Datasheet
LM2585
www.ti.com
SNVS120F –APRIL 2000–REVISED APRIL 2013
Electrical Characteristics (All Versions)
Symbol Parameters Conditions Typical Min Max Units
COMMON DEVICE PARAMETERS for all versions
(1)
I
S
Input Supply Current (Switch Off)
(2)
11 15.5/16.5 mA
I
SWITCH
= 1.8A 50 100/115 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
(3)
2.8 2.6/2.4 V
Output Swing
Lower Limit
(2)
0.25 0.40/0.55 V
I
EAO
Error Amp See
(4)
165 110/70 260/320 μA
Output Current
(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 Maximum Duty R
LOAD
= 100Ω
(3)
98 93/90 %
Cycle
I
L
Switch Leakage Switch Off 15 300/600 μA
Current
V
SWITCH
= 60V
V
SUS
Switch Sustaining dV/dT = 1.5V/ns
65 V
Voltage
V
SAT
Switch Saturation I
SWITCH
= 3.0A
0.45 0.65/0.9 V
Voltage
I
CL
NPN Switch
4.0 3.0 7.0 A
Current Limit
θ
JA
Thermal Resistance TO-220 Package, Junction to 65
Ambient
(5)
θ
JA
TO-220 Package, Junction to 45
Ambient
(6)
θ
JC
TO-220 Package, Junction to 2
Case
θ
JA
DDPAK/TO-263 Package, 56
°C/W
Junction to Ambient
(7)
θ
JA
DDPAK/TO-263 Package, 35
Junction to Ambient
(8)
(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 LM2585 is tested with the feedback voltage set to its low value (specified
in Tablenote 3) and at its high value (specified in Tablenote 2).
(5) Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads in a
socket, or on a PC board with minimum copper area.
(6) Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads
soldered to a PC board containing approximately 4 square inches of (1oz.) copper area surrounding the leads.
(7) Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board area of 0.136 square inches (the
same size as the DDPAK/TO-263 package) of 1 oz. (0.0014 in. thick) copper.
(8) Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board area of 0.4896 square inches
(3.6 times the area of the DDPAK/TO-263 package) of 1 oz. (0.0014 in. thick) copper.
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