LTC3728LEUH#TRPBF Linear Technology, LTC3728LEUH#TRPBF Datasheet - Page 5

• Manufacturer Part Number: LTC3728LEUH#TRPBF
• Description: IC REG SW DUAL 2PH STPDWN 32QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3728LEUH#TRPBF

• 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: 32-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

ELECTRICAL CHARACTERISTICS
SYMBOL
INTV
V
V
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
R
I
3.3V Linear Regulator
V
V
V
PGOOD Output
V
I
V
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 the Applications Information
section.
temperature range, otherwise specifi cations are at T
NOM
LOW
HIGH
PGOOD
PLLFLTR
INTVCC
LDO
LDO
EXTVCC
LDOHYS
3.3OUT
3.3IL
3.3VL
PGL
PG
PLLIN
LTC3728LUH/LTC3728LXUH: T
LTC3728LGN: T
CC
INT
EXT
Linear Regulator
J
is calculated from the ambient temperature T
D
according to the following formulas:
PARAMETER
Internal V
INTV
EXTV
EXTV
EXTV
Nominal Frequency
Lowest Frequency
Highest Frequency
PLLIN Input Resistance
Phase Detector Output Current
3.3V Regulator Output Voltage
3.3V Regulator Load Regulation
3.3V Regulator Line Regulation
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
Sinking Capability
Sourcing Capability
J
= T
CC
CC
CC
CC
A
Load Regulation
Voltage Drop
Switchover Voltage
Hysteresis
+ (P
CC
Voltage
D
• 95°C/W)
J
= T
A
+ (P
D
OSENSE1, 2.
• 34°C/W)
A
ITH1, 2
and power
CONDITIONS
6V < V
I
I
I
V
V
V
f
f
No Load
I
6V < V
I
V
V
CC
CC
CC
PLLIN
PLLIN
3.3
PGOOD
PLLFLTR
PLLFLTR
PLLFLTR
PGOOD
OSENSE
A
V
V
OSENSE
OSENSE
= 25°C. V
= 0 to 20mA, V
= 20mA, V
= 20mA, EXTV
to a
= 0 to 10mA
< f
> f
IN
IN
= 2mA
= 5V
with Respect to Set Output Voltage
OSC
OSC
The
< 30V, V
= 1.2V
= 0V
≥ 2.4V
< 30V
Ramping Negative
Ramping Positive
l
EXTVCC
IN
denotes the specifi cations which apply over the full operating
= 15V, V
EXTVCC
CC
EXTVCC
Ramping Positive
= 5V
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 is tested under an ideal condition without
external power FETs. It can be larger when the IC is operating in an
actual circuit. See Minimum On-Time Considerations in the Applications
Information section.
Note 7: The LTC3728LC/LTC3728LXC are guaranteed to meet performance
specifi cations from 0°C to 85°C. The LTC3728LE is guaranteed to
meet performance specifi cations over the –40°C to 85°C operating
temperature range as assured by design, characterization and correlation
with statistical process controls. The LTC3728LI is guaranteed to meet
performance specifi cations over the –40°C to 85°C operating temperature
range.
= 4V
= 4V
RUN/SS1, 2
= 5V unless otherwise noted.
LTC3728L/LTC3728LX
●
●
MIN
360
230
480
4.8
4.5
3.2
– 6
6
–7.5
3.35
0.05
TYP
100
400
260
550
–15
5.0
0.2
4.7
0.2
0.5
0.1
50
15
7.5
MAX
– 9.5
3.45
200
440
290
590
5.2
2.0
0.2
0.3
±1
9.5
2
3728lxfe
UNITS
5
kHz
kHz
kHz
mV
kΩ
μA
μA
μA
%
%
%
%
%
V
V
V
V
V