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LT8580EMS8E#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
LT8580
4
8580fa
For more information www.linear.com/LT8580
Typical perForMance characTerisTics
Switch Current Limit vs Duty Cycle
Switch Saturation Voltage
Commanded Switch Current vs SS
Switch Current Limit
vs Temperature
Positive and Negative Output
Voltage Regulation
Positive and Negative FBX Current
at Output Voltage Regulation
Oscillator Frequency
T
A
= 25°C, unless otherwise specified
DUTY CYCLE (%)
10
0
SWITCH CURRENT LIMIT (A)
0.50
0.75
0.25
1.00
1.25
1.50
1.75
30 50
70
90
8580 G01
2.00
20 40
60
80
SWITCH CURRENT (A)
0
SATURATION VOLTAGE (mV)
400
500
600
1.5
8580 G02
300
200
0
0.50.25 0.75
1
1.25
100
700
SS VOLTAGE (V)
0
0
SWITCH CURRENT (A)
0.5
1.0
1.5
2.0
0.2
0.4 0.6 0.8
8580 G03
1 1.2
TEMPERATURE (°C)
–50 –25
0
SWITCH CURRENT LIMIT (A)
0.5
1.0
1.5
2.0
0 5025 125 15010075
8580 G04
TEMPERATURE (°C)
–50 –25
1.170
POSITIVE FBX VOLTAGE (V)
NEGATIVE FBX VOLTAGE (mV)
1.200
1.220
0
50
75
8580 G05
1.175
1.180
1.185
1.190
1.195
1.215
1.210
1.205
–20
15
30
–10
–15
–5
0
5
10
25
20
25
100
150125
TEMPERATURE (°C)
–50 –25
80
POSITIVE FBX CURRENT INTO PIN (µA)
NEGATIVE FBX CURRENT OUT OF PIN (µA)
86
0
50
75
8580 G06
81
82
83
84
85
80
86
81
82
83
84
85
25
100
150125
TEMPERATURE (°C)
–50 –25
FREQUENCY (MHz)
0.8
1.0
1.2
1.4
8580 G07
0.6
0.4
0
0
5025 75
100
125
150
0.2
1.8
1.6
R
T
= 56.2k
R
T
= 422k
LT8580
5
8580fa
For more information www.linear.com/LT8580
Typical perForMance characTerisTics
SHDN Pin Current
SHDN Pin Current Active/Lockout Threshold
T
A
= 25°C, unless otherwise specified
Oscillator Frequency During
Soft-Start
Internal UVLO
FBX VOLTAGE (V)
0
0
NORMALIZED OSCILLATOR FREQUENCY (F/F
NOM
)
1/4
1/2
1/3
1/6
1/5
1
0.2
0.4
INVERTING
CONFIGURATIONS
NONINVERTING
CONFIGURATIONS
0.6 0.8
8580 G08
1 1.2
TEMPERATURE (°C)
–50 –25
2.1
V
IN
VOLTAGE (V)
2.2
2.7
2.4
2.3
0 5025 75
8580 G09
2.5
2.6
125100 150
SHDN VOLTAGE (V)
0
0
SHDN PIN CURRENT (µA)
5
10
15
20
25
30
0.50.25 1 1.50.75 1.25 1.75 2
8580 G10
125°C
25°C
–40°C
SHDN VOLTAGE (V)
0
SHDN PIN CURRENT (µA)
200
250
300
350
400
15 25
8580 G11
150
100
5 10 20 30 35 40
50
0
125°C
25°C
–40°C
TEMPERATURE (°C)
–50 –25
1.20
SHDN VOLTAGE (V)
1.22
1.26
1.28
1.30
1.40
1.34
0 50 75
8580 G12
1.24
1.36
1.38
1.32
100 125 150
SHDN RISING
SHDN FALLING
25
Minimum On Time
vs Temperature
TEMPERATURE (°C)
–50 –25
0
MINIMUM ON TIME (NS)
50
100
150
400
250
0 50 75
8580 G13
300
350
200
100 125 150
RECOMMENDED MINIMUM ON TIME
MEASURED MINIMUM ON TIME
25
LT8580
6
8580fa
For more information www.linear.com/LT8580
block DiagraM
pin FuncTions
FBX (Pin 1): Positive and Negative Feedback Pin. For a
noninverting or inverting converter, tie a resistor from the
FBX pin to V
OUT
according to the following equations:
R
FBX
=
OUT
−
83.3µA
; Noninverting Converter
R
FBX
=
V
OUT
+ 3mV
( )
83.3µA
; Inverting Converter
VC (Pin 2): Error Amplifier Output Pin. Tie external com-
pensation network to this pin.
V
IN
(Pin 3): Input Supply Pin. Must be locally bypassed.
SW (Pin 4): Switch Pin. This is the collector of the internal
NPN Power switch. Minimize the metal trace area connec-
ted to this pin to minimize EMI.
SHDN (Pin 5): Shutdown Pin. In conjunction with the
UVLO (undervoltage lockout) circuit, this pin is used
to enable/disable the chip and restart the soft-start
sequence. Drive below 1.21V to disable the chip. Drive
above 1.40V to activate the chip and restart the soft-start
sequence. Do not float this pin.
R
T (Pin 6): Timing Resistor Pin. Adjusts the switching
frequency. Place a resistor from this pin to ground to set
the frequency to a fixed free running level. Do not float
this pin.
SS (Pin 7): Soft-Start Pin. Place a soft-start capacitor here.
Upon start-up, the SS pin will be charged by a (nominally)
280k resistor to about 2.1V.
SYNC (Pin 8): To synchronize the switching frequency to
an outside clock, simply drive this pin with a clock. The
high voltage level of the clock needs to exceed 1.3V, and
the low level should be less 0.4V. Drive this pin to less
than 0.4V to revert to the internal free-running clock. See
the Applications Information section for more information.
GND (Exposed Pad Pin 9): Ground. Exposed pad must
be soldered directly to local ground plane.
–
+
–
+
–
+
–
+
+
–
∑
7
5
3
1.204V
REFERENCE
ADJUSTABLE
OSCILLATOR
FREQUENCY
FOLDBACK
SLOPE
COMPENSATION
COMPARATOR
DISCHARGE
DETECT
SS VC
280k
Q2
SR2
R
S
14.5k
14.5k
Q
SR1
A3
A4
A1
A2
SYNC
÷N
RT
SHDN
FBX
1.3V
VC
C1
SW
0.02Ω
GND
R
T
R
FBX
DRIVER
L1
D1
I
LIMIT
V
IN
V
OUT
C
SS
C
C
C
IN
R
C
V
IN
SOFT-
START
SYNC
BLOCK
UVLO
R
S
Q
6
2
1
8580 BD
8
4
Q1
9
50k
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32

LT8580EMS8E#TRPBF

Mfr. #:
Buy LT8580EMS8E#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Boost/SEPIC/Inverting DC/DC Converter with 1A, 60V Switch, Soft-Start and Synchronization
Lifecycle:
New from this manufacturer.
Delivery:
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