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LTC3633AEFE-3#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LTC3633A-2/LTC3633A-3
4
3633a23fb
For more information www.linear.com/LTC3633A-2
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
J
= 25°C (Note 2). PV
IN1
= PV
IN2
= SV
IN
=
12V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
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 LTC3633A-2/LTC3633A-3 is tested under pulsed load
conditions such that T
J
≈ T
A
. The LTC3633AE-2/ LTC3633AE-3 is
guaranteed to meet specifications from 0°C to 85°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 LTC3633AI-2/ LTC3633AI-3 is guaranteed
over the full –40°C to 125°C operating junction
temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors. The junction temperature
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
PHMODE
PHMODE Threshold Voltage PHMODE V
IH
PHMODE V
IL
1
0.3
V
V
V
MODE/SYNC
MODE/SYNC Threshold Voltage MODE V
IH
MODE V
IL
1
0.4
V
V
SY
NC Threshold Voltage SYNC V
IH
0.95 V
I
MODE
MODE/SYNC Input Current MODE = 0V
MODE = INTV
CC
1.5
–1.5
µA
µA
(T
J
, in °C) is calculated from the ambient temperature (T
A
, in °C) and
power dissipation (P
D
, in Watts) according to the formula:
T
J
= T
A
+ (P
D
• θ
JA
), where θ
JA
(in °C/W) is the package thermal
impedance.
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 4: Output voltages outside the specified range are not optimized for
controlled on-time operation. Refer to the Applications Information section
for further discussions related to the output voltage range.
Note 5: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
LTC3633A-2/LTC3633A-3
5
3633a23fb
For more information www.linear.com/LTC3633A-2
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
Burst Mode Operation
Efficiency vs Input Voltage
Burst Mode Operation
Load Regulation
Oscillator Frequency
vs Temperature
Efficiency vs Load Current
Burst Mode Operation
Efficiency vs Load Current
Forced Continuous Mode
Operation Efficiency vs Load Current
T
J
= 25°C, PV
IN1
= PV
IN2
= SV
IN
= 12V, f
SW
= 1MHz,
L = 1µH unless otherwise noted.
Oscillator Internal Set Frequency
vs Temperature
Reference Voltage
vs Temperature
0.001
0
EFFICIENCY (%)
10
30
40
50
70
0.1
10
3633a23 G01
20
80
100
90
60
0.01 1
LOAD CURRENT (A)
V
OUT
= 1.8V
V
IN
= 20V
V
IN
= 12V
V
IN
= 8V
V
IN
= 4V
0.001
0
10
30
40
50
70
0.1
20
80
90
60
0.01 1
LOAD CURRENT (A)
V
IN
= 20V
V
IN
= 12V
V
IN
= 8V
V
IN
= 4V
V
OUT
= 1.8V
0.001
0
EFFICIENCY (%)
10
30
40
50
70
0.1
10
3633a23 G03
20
80
100
90
60
0.01 1
LOAD CURRENT (A)
Burst Mode OPERATION
FORCED
CONTINUOUS
OPERATION
V
OUT
= 3.3V
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 5V
L
= 2.2µH
4
EFFICIENCY (%)
65
70
75
85
8
20
3633a23 G05
60
90
100
95
80
6 10 12 14 16 18
I
LOAD
= 10mA
I
LOAD
= 100mA
I
LOAD
= 1A
I
LOAD
= 3A
INPUT VOLTAGE (V)
V
OUT
= 1.8V
0.0001 0.001
0
EFFICIENCY (%)
10
30
40
50
70
0.1
10
3633a23 G04
20
80
100
90
60
0.01 1
LOAD CURRENT (A)
V
IN
= 20V
V
IN
=15V
V
IN
= 12V
V
IN
= 8V
V
IN
= 4V
V
OUT
= 1.2V
–50
V
FB
(V)
0.597
0.599
50
150
3633a23 G06
0.595
0.601
0.605
0.603
25–25 0 75 100 125
TEMPERATURE (°C)
0
∆V
OUT
/V
OUT
(%)
0.0
0.4
1.5
3
3633a23 G07
–0.4
0.8
1.6
1.2
10.5 2 2.5
I
LOAD
(A)
Burst Mode OPERATION
FORCED CONTINUOUS
V
OUT
= 1.8V
–50
FREQUENCY VARIATION (%)
–8
–6
–4
–2
0
2
4
6
8
25
125
3633a23 G08
–10
10
0–25 50 75 100
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
1.6
1.8
2.0
2.2
2.4
25
125
3633a23 G09
1.4
2.6
0–25 50 75 100
TEMPERATURE (°C)
R
T
= INTV
CC
LTC3633A-2/LTC3633A-3
6
3633a23fb
For more information www.linear.com/LTC3633A-2
Burst Mode Operation
Internal MOSFET R
DS(ON)
vs Temperature
Quiescent Current vs V
IN
Burst Mode Operation
Switch Leakage vs Temperature
Valley Current Limit
vs Temperature
TRACKSS Pull-Up Current
vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Current vs V
IN
Load Step
4
I
Q
(µA)
100
200
300
500
8
20
3633a23 G11
0
600
900
800
700
400
6 10 12 1614 18
90°C
25°C
–40°C
V
IN
(V)
4
I
Q
(µA)
2
4
6
10
8
20
3633a G12
0
12
24
22
16
18
20
14
8
6 10 12 14 16 18
V
IN
(V)
–50
LEAKAGE CURRENT (nA)
1000
2000
3000
5000
0
150
100 125
3633a23 G13
0
6000
10000
9000
8000
7000
4000
–25 25 50 75
TEMPERATURE (°C)
SYNCHRONOUS SWITCH
MAIN SWITCH
T
J
= 25°C, PV
IN1
= PV
IN2
= SV
IN
= 12V, f
SW
= 1MHz,
L = 1µH unless otherwise noted.
TEMPERATURE (°C)
–50
1.4
1.6
2.0
25 75
3633a23 G15
1.2
1.0
–25 0
50 100
125
0.8
0.6
1.8
I
TRACKSS
(µA)
–50
I
LIM
(A)
3.4
3.5
50
3633a23 G14
3.3
3.7
3.6
3.9
3.8
25–25 0 75 100
125
TEMPERATURE (°C)
I
L
1A/DIV
SW
10V/DIV
5µs/DIV
3633a23 G17
V
OUT
50mV/DIV
V
OUT
= 1.8V
I
LOAD
= 100mA
I
L
2A/DIV
20µs/DIV
3633a23 G18
V
OUT
AC-COUPLED
100mV/DIV
V
OUT
= 1.8V
I
LOAD
= 100mA to 3A
C
ITH
= 220pF
R
ITH
= 13kΩ
–50 –25
0
R
DS(ON)
(mΩ)
20
60
80
100
140
50
125
3633a23 G10
40
160
200
180
120
0 25 75 100
TEMPERATURE (°C)
TOP SWITCH
BOTTOM SWITCH
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LTC3633AEFE-3#PBF

Mfr. #:
Buy LTC3633AEFE-3#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual 3A, 20Vin, 4MHz, Monolithic Synchronous Step-Down Regulator
Lifecycle:
New from this manufacturer.
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