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LTC3417AEFE-1#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC3417A-1
4
3417a1fa
OUT1 Burst Mode Operation
OUT1 Pulse Skipping
Mode Operation
OUT1 Forced Continuous
Mode Operation
OUT2 Burst Mode Operation
OUT2 Pulse Skipping
Mode Operation
OUT2 Forced Continuous
Mode Operation
ELECTRICAL CHARACTERISTICS
TYPICAL PERFORMANCE 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 LTC3417AE-1 is guaranteed to meet specifi ed performance
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
ambient temperature range are assured by design, characterization
and correlation with statistical process controls. The LTC3417AI-1 is
guaranteed to meet performance specifi cations over the –40°C to 125°C
operating temperature range.
Note 3: The LTC3417A-1 is tested in feedback loop which servos V
FB1
to
the midpoint for the error amplifi er (V
ITH1
= 0.6V) and V
FB2
to the midpoint
for the error amplifi er (V
ITH2
= 0.6V).
Note 4: Total supply current is higher due to the internal gate charge being
delivered at the switching frequency.
Note 5: Switch on-resistance is guaranteed by design and test correlation
on the DHC package and by fi nal test correlation on the FE package.
Note 6: Variable frequency operation with resistor is guaranteed by design
but not production tested and is subject to duty cycle limitations.
Note 7: 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 specifi ed maximum operating junction
temperature may impair device reliability.
Note 8: T
J
is calculated from the ambient temperature, T
A
, and power
dissipation, P
D
, according to the following formula:
LTC3417AEDHC-1: T
J
= T
A
+ (P
D
• 43°C/W)
LTC3417AEFE-1: T
J
= T
A
+ (P
D
• 38°C/W)
3417A-1 G01
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 100mA
REFER TO FIGURE 4
I
L
250mA/DIV
V
OUT
20mV/DIV
2µs/DIV
3417A-1 G02
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 100mA
REFER TO FIGURE 4
I
L
250mA/DIV
V
OUT
20mV/DIV
2µs/DIV
3417A-1 G03
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 100mA
REFER TO FIGURE 4
I
L
250mA/DIV
V
OUT
20mV/DIV
2µs/DIV
3417A-1 G04
V
IN
= 3.6V
V
OUT
= 2.5V
I
LOAD
= 60mA
REFER TO FIGURE 4
I
L
250mA/DIV
V
OUT
20mV/DIV
2µs/DIV
3417A-1 G05
V
IN
= 3.6V
V
OUT
= 2.5V
I
LOAD
= 60mA
REFER TO FIGURE 4
I
L
250mA/DIV
V
OUT
20mV/DIV
2µs/DIV
3417A-1 G06
V
IN
= 3.6V
V
OUT
= 2.5V
I
LOAD
= 60mA
REFER TO FIGURE 4
I
L
250mA/DIV
V
OUT
20mV/DIV
2µs/DIV
LTC3417A-1
5
3417a1fa
OUT2 Effi ciency vs V
IN
(Pulse Skipping Mode) Load Step OUT1 Load Step OUT2
Effi ciency vs Frequency OUT1 Effi ciency vs Frequency OUT2 R
DS(ON)
vs V
IN
OUT1
TYPICAL PERFORMANCE CHARACTERISTICS
OUT1 Effi ciency vs Load Current
OUT2 Effi ciency vs Load Current
OUT1 Effi ciency vs V
IN
(Burst Mode Operation)
LOAD CURRENT (A)
70
EFFICIENCY (%)
80
85
95
100
0.001 0.1 1 10
3417A-1 G07
60
0.01
90
75
65
V
IN
= 2.5V
V
OUT
= 1.8V
Burst Mode
OPERATION
PULSE SKIP
FORCED
CONTINUOUS
REFER TO FIGURE 4
0.001 0.1 1 100.01
LOAD CURRENT (A)
80
EFFICIENCY (%)
90
100
3417A-1 G08
70
75
85
95
65
60
V
IN
= 3.6V
V
OUT
= 2.5V
Burst Mode
OPERATION
PULSE SKIP
FORCED
CONTINUOUS
REFER TO FIGURE 4
V
IN
(V)
2 2.5 3.5 4.5 5.5
EFFICIENCY (%)
90
95
100
3417A-1 G09
85
80
3
45
75
70
V
OUT
= 1.8V
I
LOAD
= 1.4A
I
LOAD
= 460mA
REFER TO FIGURE 4
V
IN
(V)
2 2.5
EFFICIENCY (%)
90
95
100
3417A-1 G10
85
80
3 3.5
4 4.5 5
75
70
V
OUT
= 2.5V
REFER TO FIGURE 4
I
LOAD
= 800mA
I
LOAD
= 250mA
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0.25A to 1.4A
REFER TO FIGURE 4
I
OUT1
500mA/DIV
V
OUT1
100mV/DIV
3417A-1 G11
100µs/DIV
V
IN
= 3.6V
V
OUT
= 2.5V
I
LOAD
= 0.25A to 0.8A
REFER TO FIGURE 4
I
OUT2
500mA/DIV
V
OUT2
100mV/DIV
3417A-1 G12
100µs/DIV
FREQUENCY (MHz)
0
82
EFFICIENCY (%)
84
86
88
90
92
94
1234
3417A-1 G13
5
T
A
= 27°C
V
IN
= 3.6V
V
OUT
= 1.8V
I
OUT
= 300mA
FREQUENCY (MHz)
0
60
EFFICIENCY (%)
65
70
75
80
85
90
12 3
3417A-1 G14
T
A
= 27°C
V
IN
= 3.6V
V
OUT
= 2.5V
I
OUT
= 100mA
V
IN
(V)
2 2.5
0.080
R
DS(ON)
(Ω)
0.090
0.105
3
4
4.5
3417A-1 G15
0.085
0.100
0.095
3.5
5
5.5
T
A =
27°C
P-CHANNEL SWITCH
N-CHANNEL SWITCH
LTC3417A-1
6
3417a1fa
(DFN/TSSOP)
RUN1 (Pin 1/Pin 2): Enable for 1.5A Regulator. When
at Logic 1, 1.5A regulator is running. When at 0V, 1.5A
regulator is off. When both RUN1 and RUN2 are at 0V, the
part is in shutdown.
V
IN1
(Pin 2/Pin 3): Supply Pin for P-Channel Switch of
1.5A Regulator.
I
TH1
(Pin 3/Pin 4): Error Amplifi er Compensation Point
for 1.5A Regulator. The current comparator threshold
increases with this control voltage. Nominal voltage range
for this pin is 0V to 1.5V.
V
FB1
(Pin 4/Pin 5): Receives the feedback voltage from
external resistive divider across the 1.5A regulator output.
Nominal voltage for this pin is 0.8V.
V
FB2
(Pin 5/Pin 6): Receives the feedback voltage from
external resistive divider across the 1A regulator output.
Nominal voltage for this pin is 0.8V.
I
TH2
(Pin 6/Pin 7): Error Amplifi er Compensation Point for
1A regulator. The current comparator threshold increases
with this control voltage. Nominal voltage range for this
pin is 0V to 1.5V.
RUN2 (Pin 7/Pin 8): Enable for 1A Regulator. When at
Logic 1, 1A regulator is running. When at 0V, 1A regula-
tor is off. When both RUN1 and RUN2 are at 0V, the part
is in shutdown.
V
IN2
(Pin 8/Pin 9): Supply Pin for P-Channel Switch of 1A
Regulator and Supply for Analog Circuitry.
SYNC/MODE (Pin 9/Pin 12): Combination Mode Selection
and Oscillator Synchronization Pin. This pin controls the op-
eration of the device. When the voltage on the SYNC/MODE
pin is >(V
IN
– 0.5V), Burst Mode operation is selected.
When the voltage on the SYNC/MODE pin is <0.5V, pulse
skipping mode is selected. When the SYNC/MODE pin is
held at V
IN
/2, forced continuous mode is selected. The
oscillation frequency can be synchronized to an external
oscillator applied to this pin. When synchronized to an
external clock, pulse skip mode is selected.
SW2 (Pin 10/Pin 13): Switch Node Connection to the
Inductor for the 1A Regulator. This pin swings from V
IN2
to PGND2.
POR (Pin 11/Pin 14): The Power-On-Reset Pin. This
open drain-logic output is pulled to GND when the output
voltage of either regulator falls 8% below regulation and
goes high approximately 150ms after both regulators are
above –6% of regulation. If either RUN1 or RUN2 is low
(the respective regulator is in sleep mode and therefore
the output voltage is low), then POR refl ects the regulation
of the running regulator.
FREQ (Pin 12/Pin 15): Frequency Set Pin. When FREQ is
at V
IN
, internal oscillator runs at 1.5MHz. When a resistor
is connected from this pin to ground, the internal oscillator
frequency can be varied from 0.6MHz to 4MHz.
GNDA (Pin 13/Pin 16): Analog Ground Pin for Internal
Analog Circuitry.
PIN FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS
R
DS(ON)
vs V
IN
OUT2 Frequency vs V
IN
Frequency vs Temperature
V
IN
(V)
2
R
DS(ON)
(Ω)
0.18
0.19
0.20
3.5 4.5
3417A-1 G16
0.17
0.16
2.5 3
4 5 5.5
0.15
0.14
T
A
= 27°C
P-CHANNEL SWITCH
N-CHANNEL SWITCH
V
IN
(V)
2
FREQUENCY VARIATION (%)
0
2
4
5 5.5
3417A-1 G17
–4
–10
2.5 3
3.5
4 4.5
6
–2
–6
–8
FREQ = 143k TO GROUND
FREQ = V
IN
TEMPERATURE (°C)
–50
FREQUENCY VARIATION (%)
5
10
15
25 75
3417A-1 G18
0
–5
–25 0
50 100 125
–10
–15
FREQ = 143k TO GROUND
FREQ = V
IN
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC3417AEFE-1#TRPBF

Mfr. #:
Buy LTC3417AEFE-1#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual 1.5A & 1A, 4MHz Synchronous Step-Down DC/DC Converter in 3x5 DFN-16 or TSSOP-20E
Lifecycle:
New from this manufacturer.
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