BIAS, BD Voltage ......................................................10V
C
T
Pin Voltage .............................................................5V
RUN-SS1, RUN-SS2, RUN-SS3/4 Voltage ...................5V
FB1, FB2, FB3, FB5 Voltage .........................................5V
NFB4 Voltage ......................................................5V, –5V
V
C1
, V
C2
, V
C3
, V
C4
Voltage ..........................................5V
Junction Temperature (Note 8) ............................. 125°C
Operating Temperature Range (Note 2).. –40°C to 125°C
Storage Temperature Range .................. –65°C to 125°C
(Note 1)
pin conFiguraTion
TOP VIEW
UVLO
SW1
SW1
GND
FB1
31 SENSE
+
30 SENSE
–
29 BIAS
28 BOOST
27 LDOPWR
39
26 BD
25 SW4
24 D4
23 NFB4
22 RUN-SS1
21 V
C4
20 V
C2
13 14 15 16 17 18 19
SW2
SW2
BIAS
GND
GND
FB2
C
T
V
IN
V
IN
38 37 36 35 34 33 32
FB5 1
V
C1
2
RUN-SS3/4 3
FB3 4
RUN-SS2 5
SW3 6
E3 7
V
ON
8
V
ONSINK
9
V
ON_CLK
10
PGOOD
11
V
C3
12
UHF PACKAGE
38-LEAD (5mm
×
7mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 34°C/W,
θ
JC
= 1°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
orDer inFormaTion
LEAD FREE FINISH
LT3513EUHF#PBF
LT3513IUHF#PBF
TAPE AND REEL
LT3513EUHF#TRPBF
LT3513IUHF#TRPBF
PART MARKING*
3513
3513
PACKAGE DESCRIPTION
38-Lead (5mm
×
7mm) Plastic QFN
38-Lead (5mm
×
7mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, BIAS = 3V, unless otherwise noted.
PARAMETER
Minimum Input Voltage
Quiescent Current
RUN-SS1, RUN-SS2, RUN-SS3/4 Pin Current
RUN-SS1, RUN-SS2, RUN-SS3/4 Threshold
BIAS Pin Voltage to Begin RUN-SS2, RUN-SS3/4
BIAS Pin Current
BIAS = 3.1V, All Switches Off
l
elecTrical characTerisTics
CONDITIONS
MIN
l
TYP
7.5
30
2
0.8
2.25
16.5
MAX
4.5
12
65
UNITS
V
mA
µA
µA
V
Not Switching
V
RUNSS1
= 0V
RUN-SS1= RUN-SS2 = RUN-SS3
= RUN-SS4 = 0.4V
2.7
20
V
mA
3513fc
2
LT3513
elecTrical characTerisTics
PARAMETER
FB Threshold Offset to Begin C
T
Charge
C
T
Pin Current Source
C
T
Threshold to Power V
ON
V
ON
Switch Drop
Maximum V
ON
Current
V
ON_CLK
Input Voltage High
V
ON_CLK
Input Voltage Low
V
ONSINK
Voltage On
Master Oscillator Frequency
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, BIAS = 3V, unless otherwise noted.
CONDITIONS
(Note 3)
All FB Pins = 1.5V, C
T
= 0.35V
All FB Pins = 1.5V
V
ON
Current = 30mA
V
E3
= 30V
l
MIN
90
16
1
30
1.5
TYP
125
20
1.1
200
50
MAX
160
25
1.2
400
UNITS
mV
µA
V
mV
mA
V
0.3
V
ONSINK
Current = 1µA
l
V
V
MHz
MHz
kHz
V
1.2
1.90
1.80
2
200
1.25
3.4
90
4
1
1.215
1.205
1.235
0.01
1.255
1.265
0.03
200
3.9
125
4.5
160
2.12
2.22
Foldback Switching Frequency
UVLO Pin Threshold
UVLO Pin Hysteresis Current
PGOOD
Threshold Offset
PGOOD
Sink Current
PGOOD
Pin Leakage
Switch 1 (2.2A Buck)
FB1 Voltage
FB2 = 0V, FB3 = 0V, NFB4 = 0V
UVLO Pin Voltage Rising
V
UVLO
= 1V
PGOOD
Connected to 40V Through 100k
V
PGOOD
= 40V
µA
mV
mA
µA
V
V
%/V
nA
V/V
µmhos
%
l
FB1 Voltage Line Regulation
FB1 Pin Bias Current
Error Amplifier 1 Voltage Gain
Error Amplifier 1 Transconductance
Maximum Duty Cycle
Switch 1 Current Limit
Switch 1 V
CESAT
Switch 1 Leakage Current
Minimum BOOST Voltage Above SW1 Pin
BOOST Pin Current
BOOST Schottky Diode Drop
Switch 2 (1.5A BOOST)
FB2 Voltage
4.5V < V
IN
< 30V
(Note 4)
ΔI
= 10µA
l
l
30
250
220
75
2.2
85
3
430
0.1
1.8
30
700
1.20
1.19
1.22
0.01
Duty Cycle = 35% (Note 6)
I
SW
= 1.5A
FB1 = 1.5V, RUN-SS1 = 0V
I
SW
= 1.5A (Note 7)
I
SW
= 1.5A
I = 170mA
3.5
10
2.5
50
A
mV
µA
V
mA
mV
l
1.24
1.25
0.03
200
V
V
%/V
nA
V/V
µmhos
FB2 Voltage Line Regulation
FB2 Pin Bias Current
Error Amplifier 2 Voltage Gain
Error Amplifier 2 Transconductance
Switch 2 Current Limit
Switch 2 V
CESAT
Switch 2 Leakage Current
BIAS Pin Current Due to SW2
Maximum Duty Cycle (SW2)
4.5V < V
IN
< 30V
(Note 5)
ΔI
= 10µA
(Note 6)
I
SW2
= 1.2A
FB2 = 1.5V, RUN-SS1 = 0V
I
SW2
= 1.2A
l
l
30
250
220
1.5
1.85
360
0.1
45
75
90
2.4
1
A
mV
µA
mA
%
3513fc
3
LT3513
elecTrical characTerisTics
PARAMETER
Switch 3 (250mA BOOST)
FB3 Voltage
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, BIAS = 3V, unless otherwise noted.
CONDITIONS
MIN
1.20
1.19
TYP
1.22
0.01
l
MAX
1.24
1.25
0.03
200
UNITS
V
V
%/V
nA
V/V
µmhos
FB3 Voltage Line Regulation
FB3 Pin Bias Current
Error Amplifier 3 Voltage Gain
Error Amplifier 3 Transconductance
Switch 3 Current Limit
Switch 3 V
CESAT
Switch 3 Leakage Current
BIAS Pin Current Due to SW3
Maximum Duty Cycle (SW3)
Schottky Diode Drop
Switch 4 (250mA Inverter)
NFB4 Voltage
4.5V < V
IN
< 30V
(Note 4)
ΔI
= 10µA
(Note 6)
I
SW3
= 0.2A
FB3 = 1.5V, RUN-SS1 = 0V
I
SW3
= 0.2A
l
30
250
220
0.25
0.3
200
0.1
18
84
88
900
–1.205
–1.215
–1.180
0.01
0.38
1
A
mV
µA
mA
%
mV
I = 170mA
l
–1.155
–1.145
0.03
16
V
V
%/V
µA
V/V
µmhos
NFB4 Voltage Line Regulation
NFB4 Pin Bias Current
Error Amplifier 4 Voltage Gain
Error Amplifier 4 Transconductance
Switch 4 Current Limit
Switch 4 V
CESAT
Switch 4 Leakage Current
BIAS Pin Current Due to SW4
Maximum Duty Cycle (SW4)
Schottky Diode Drop (D4)
NPN LDO
FB5 Voltage
4.5V < V
IN
< 30V
(Note 4)
ΔI
= 10µA
(Note 6)
I
SW4
= 0.2A
NFB4 = –1.5V, RUN-SS1 = 0V
I
SW4
= 0.2A
84
I = 170mA
0.61
0.6
6
4.5
0.25
l
5
200
220
0.3
200
0.1
18
88
700
0.625
30
8
0.40
1
A
mV
µA
mA
%
mV
l
0.63
0.65
200
10
V
V
nA
mA
V
FB5 Pin Bias Current
Base Drive Current
LDOPWR Minimum Voltage
(Note 4)
FB5 = 0.5V
BD = 3.5V
l
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LT3513E is guaranteed to meet specified performance from
0°C to 125°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3513I is guarenteed over the full –40°C to 125°C operating junction
temperature range.
Note 3:
The C
T
pin is held low until FB1, FB2, FB3 and NFB4 all ramp
above the FB threshold offset.
Note 4:
Current flows out of FB1, FB3, NFB4 and FB5.
Note 5:
Current may flow in or out of FB2. The absolute value of this test
is used.
Note 6:
Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at higher duty cycles.
Note 7:
This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
Note 8:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
range when overtemperature protection is active. Continuous operation
above the specified maximum operating junction temperature may impair
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