LTC3738 Datasheet, PDF (4/32 Pages) Linear Technology – 3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning

LTC3738
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = V_OUTEN = V_SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Oscillator and Phase-Locked Loop
f_NOM
f_LOW
f_HIGH
R_FCB
I_{PLL LPF}
R_RELPHS
Nominal Frequency
Lowest Frequency
Highest Frequency
FCB Clock Input Threshold
Phase Detector Output Current
Sinking Capability
Sourcing Capability
Controller 2-Controller 1 Phase
Controller 3-Controller 1 Phase
V_PLLFLTR = 1.2V
V_PLLFLTR = 0V
V_PLLFLTR = 2.4V
f_PLLIN < f_OSC
f_PLLIN > f_OSC
325
365
415
kHz
190
220
250
kHz
480
550
630
kHz
1.2
V
20
µA
20
µA
120
Deg
240
Deg
No_CPU Detection
t_NOCPU
No-CPU Shutdown Latency
Differential Amplifier
After All VID Bits = “1”
0.5
1
µs
A_V
V_OS
CM
CMRR
Differential Gain
Input Offset Voltage
Common Mode Input Voltage Range
Common Mode Rejection Ratio
IN⁺ = IN^– = 1.2V, Input Referred
0V < IN⁺ = IN^– < 5V, Input Referred
1.000
V/V
0.5
mV
0
5
V
70
dB
GBP
Gain Bandwidth Product
2
MHz
V_O(MAX)
Maximum High Output Voltage
R_IN
Input Resistance
Active Voltage Positioning
I_SINK
Sinking Current Ability of AVP Pin
I_SOURCE
Sourcing Current Ability of AVP Pin
V_AVP – V_O(MAX) Max Voltage Drops V_AVP to VO
Thermal Detection
Measured at IN⁺ Pin
IN⁺ = 1.2V
IN⁺ = 1.2V
IN⁺ = 1.2V, V_IN = 60mV
V_CC – 0.8
V
160
kΩ
0.250
mA
1.4
mA
180
mV
V_INT
V_{INT_HYS}
V_{TH_TH}
Thermal Comparator Trip Threshold
Hysteresis
Internal Detection Enable Threshold
1.67
V
0.21
V
3.4 V_CC – 1
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
T_J = T_A + (P_D × 34°C/W)
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_ITH = 1.2V).
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 an inductor peak-
to-peak ripple current of ≥ 40% of I_MAX (see minimum on-time
considerations in the Applications Information Section).
Note 6: ATTEN_ERR specification is in addition to the output voltage
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.
3738f
4