LTC3738 Linear Technology, LTC3738 Datasheet - Page 4

• Manufacturer Part Number: LTC3738
• Description: 3-Phase Buck Controller
• Manufacturer: Linear Technology

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ELECTRICAL CHARACTERISTICS
LTC3738
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 IC is tested in a feedback loop that includes the differential
amplifier driving the VID DAC into the error amplifier and servoing the
resultant voltage to the midrange point for the error amplifier (V
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
temperature range, otherwise specifications are at T
SYMBOL
Oscillator and Phase-Locked Loop
f
f
f
R
I
R
No_CPU Detection
t
Differential Amplifier
A
V
CM
CMRR
GBP
V
R
Active Voltage Positioning
I
I
V
Thermal Detection
V
V
V
4
NOM
LOW
HIGH
PLL LPF
NOCPU
SINK
SOURCE
FCB
RELPHS
V
OS
O(MAX)
IN
AVP
INT
INT_HYS
TH_TH
T
J
– V
= T
O(MAX)
J
A
is calculated from the ambient temperature T
+ (P
D
according to the following formula:
D
PARAMETER
Nominal Frequency
Lowest Frequency
Highest Frequency
FCB Clock Input Threshold
Phase Detector Output Current
Controller 2-Controller 1 Phase
Controller 3-Controller 1 Phase
No-CPU Shutdown Latency
Differential Gain
Input Offset Voltage
Common Mode Input Voltage Range
Common Mode Rejection Ratio
Gain Bandwidth Product
Maximum High Output Voltage
Input Resistance
Sinking Current Ability of AVP Pin
Sourcing Current Ability of AVP Pin
Max Voltage Drops V
Thermal Comparator Trip Threshold
Hysteresis
Internal Detection Enable Threshold
× 34°C/W)
Sinking Capability
Sourcing Capability
AVP
to VO
A
CONDITIONS
V
V
V
After All VID Bits = “1”
IN
0V < IN
Measured at IN
IN
IN
IN
and power
f
f
PLLFLTR
PLLFLTR
PLLFLTR
PLLIN
PLLIN
+
+
+
+
A
= IN
= 1.2V
= 1.2V
= 1.2V, V
= 25°C. V
ITH
< f
> f
+
–
= IN
= 1.2V
= 0V
= 2.4V
= 1.2V, Input Referred
= 1.2V).
OSC
OSC
The
–
IN
< 5V, Input Referred
●
= 60mV
+
CC
Pin
denotes the specifications which apply over the full operating
= V
Note 5: The minimum on-time condition corresponds to an inductor peak-
to-peak ripple current of ≥ 40% of I
considerations in the Applications Information Section).
Note 6: ATTEN
accuracy specified at VID code 110101.
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 specified maximum operating junction temperature may impair
device reliability.
OUTEN
= V
SS
= 5V unless otherwise noted.
ERR
specification is in addition to the output voltage
MAX
MIN
325
190
480
0.5
3.4
(see minimum on-time
0
V
V
CC
1.000
0.250
CC
1.67
0.21
TYP
365
220
550
120
240
160
180
1.2
0.5
1.4
20
20
70
1
2
– 0.8
– 1
MAX
415
250
630
5
UNITS
MHz
3738f
Deg
Deg
kHz
kHz
kHz
V/V
mV
mA
mA
mV
kΩ
µA
µA
dB
µs
V
V
V
V
V
V