ltc3729euh-trpbf Linear Technology Corporation, ltc3729euh-trpbf Datasheet - Page 4

• Manufacturer Part Number: ltc3729euh-trpbf
• Description: 550khz, Polyphase, High Efficiency, Synchronous Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
LTC3729
temperature range, otherwise specifications are at T
SYMBOL
CLKOUT
CLK
CLK
PGOOD Output
V
I
V
Differential Amplifier
A
CMRR
R
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2: T
dissipation P
Note 3: The LTC3729 is tested in a feedback loop that servos V
specified voltage and measures the resultant V
4
TYPICAL PERFOR A CE CHARACTERISTICS
PGOOD
PGL
PG
DA
IN
100
LTC3729EG: T
LTC3729EUH: T
HIGH
LOW
80
60
40
20
0
0.1
DA
Efficiency vs Output Current
(Figure 12)
J
is calculated from the ambient temperature T
D
PARAMETER
Phase (Relative to Controller 1)
Clock High Output Voltage
Clock Low Output Voltage
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
Gain
Common Mode Rejection Ratio
Input Resistance
according to the following formulas:
OUTPUT CURRENT (A)
J
= T
J
1
= T
A
A
+ (P
V
V
V
V
+ (P
IN
IN
IN
IN
D
= 5V
= 8V
= 12V
= 20V
D
• 95 C/W)
• 34 C/W)
10
V
V
I
f = 250kHz
OUT
OUT
EXTVCC
W
= 20A
= 3.3V
3729
= 5V
G01
U
100
EAIN
.
CONDITIONS
V
V
V
I
V
V
0V < V
Measured at V
A
PGOOD
100
PHASMD
PHASMD
PHASMD
PGOOD
EAIN
and power
90
80
70
60
50
V
V
1
Efficiency vs Output Current
(Figure 12)
A
EAIN
EAIN
with Respect to Set Output Voltage
CM
= 25 C. V
= 2mA
ITH
= 5V
= 0V
= Open
= 5V
Ramping Negative
Ramping Positive
< 5V
to a
V
The
EXTVCC
OS
OUTPUT CURRENT (A)
+ Input
IN
V
= 5V
EXTVCC
denotes the specifications which apply over the full operating
= 15V, V
10
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: The minimum on-time condition corresponds to the on inductor
peak-to-peak ripple current 40% of I
Considerations in the Applications Information section).
Note 6: The LTC3729E is guaranteed to meet performance specifications
from 0 C to 70 C. Specifications over the – 40 C to 85 C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
= 0V
RUN/SS
V
f = 250kHz
OUT
= 3.3V
= 5V unless otherwise noted.
3729
G02
100
100
90
80
70
Efficiency vs Input Voltage
(Figure 12)
5
0.995
MIN
– 6
46
MAX
4
6
(see Minimum On-Time
10
– 7.5
TYP
120
0.1
60
90
55
80
7.5
1
V
IN
(V)
1.005
MAX
– 9.5
0.2
0.3
15
9.5
1
V
V
I
f = 250kHz
OUT
OUT
EXTVCC
sn3729 3729fas
= 20A
= 3.3V
3729
= 5V
UNITS
G03
Deg
Deg
Deg
V/V
k
20
dB
%
%
V
V
V
A