LTC3728LEGN-1#PBF Linear Technology, LTC3728LEGN-1#PBF Datasheet - Page 4

• Manufacturer Part Number: LTC3728LEGN-1#PBF
• Description: IC REG SYNC DUAL 28-SSOP
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3728LEGN-1#PBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 7 V
• Current - Output: 3A
• Frequency - Switching: 250kHz ~ 550kHz
• Voltage - Input: 4.5 ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

ELECTRICAL CHARACTERISTICS
LTC3728L-1
temperature range, otherwise specifi cations are at T
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: T
dissipation P
Note 3: The IC is tested in a feedback loop that servos V
specifi ed voltage and measures the resultant V
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
TYPICAL PERFORMANCCE CHARACTERISTICS
SYMBOL
I
3.3V Linear Regulator
V
V
V
I
PGOOD Output
V
I
V
4
PLLFLTR
3.3LEAK
PGOOD
3.3OUT
3.3IL
3.3VL
PGL
PG
LTC3728LUH-1: T
LTC3728LGN-1: T
100
90
80
70
60
50
40
30
20
10
0
0.001
Effi ciency vs Output Current
and Mode (Figure 13)
J
OPERATION
is calculated from the ambient temperature T
Burst Mode
D
according to the following formulas:
PARAMETER
0.01
Phase Detector Output Current
3.3V Regulator Output Voltage
3.3V Regulator Load Regulation
3.3V Regulator Line Regulation
Leakage Current in Shutdown
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
OUTPUT CURRENT (A)
Sinking Capability
Sourcing Capability
J
J
= T
= T
CONSTANT
FREQUENCY
(BURST DISABLE)
A
A
0.1
+ (P
+ (P
FORCED
CONTINUOUS
MODE (PWM)
D
D
• 34°C/W)
• 95°C/W)
1
V
V
f = 250kHz
IN
OUT
= 15V
3728L1 G01
= 5V
OSENSE1, 2.
10
A
ITH1, 2
100
and power
CONDITIONS
f
f
No Load
I
6V < V
V
I
V
V
90
80
70
60
50
PLLIN
PLLIN
3.3
PGOOD
0.001
RUN/SS1
PGOOD
OSENSE
V
V
A
Effi ciency vs Output Current
(Figure 13)
OSENSE
OSENSE
= 0 to 10mA
= 25°C. V
to a
< f
> f
IN
= 2mA
= 5V
with Respect to Set Output Voltage
OSC
OSC
< 30V
= 0V; V
The
Ramping Negative
Ramping Positive
0.01
V
OUTPUT CURRENT (A)
IN
l
IN
= 20V
RUN/SS2
denotes the specifi cations which apply over the full operating
V
V
= 15V, V
IN
IN
= 7V
V
= 15V
0.1
IN
Note 5: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 6: The minimum on-time condition is specifi ed for an inductor
peak-to-peak ripple current ≥ 40% of I
considerations in the Applications Information section).
Note 7: The LTC3728LE-1 are guaranteed to meet performance
specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C
operating temperature range are assured by design, characterization
and correlation with statistical process controls. The LTC3728LI-1 is
guaranteed to meet performance specifi cations over the full –40°C to 85°C
operating temperature range
= 10V
= 0V, V
RUN/SS1, 2
IN
1
V
f = 250kHz
= 3V
OUT
3728L1 G02
= 5V
= 5V unless otherwise noted.
10
100
90
80
70
50
60
5
Effi ciency vs Input Voltage
(Figure 13)
●
●
MAX
MIN
3.2
– 6
6
(see minimum on-time
INPUT VOLTAGE (V)
15
3.35
0.05
–7.5
TYP
–15
0.5
0.1
15
10
7.5
MAX
3.45
– 9.5
0.2
0.3
25
50
±1
9.5
2
V
I
f = 250kHz
OUT
OUT
3728L1 G03
= 3A
= 5V
3728l1fc
UNITS
35
μA
μA
μA
μA
%
%
%
%
V
V