LTC3735 Datasheet, PDF (4/32 Pages) Linear Technology – 2-Phase, High Efficiency DC/DC Controller for Intel Mobile CPUs

LTC3735
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_PVCC = 5V, V_RUN/SS = 5V unless otherwise noted.
SYMBOL PARAMETER
Oscillator
I_FREQSET FREQSET Input Current
f_NOM
Nominal Frequency
f_LOW
Lowest Frequency
f_HIGH
Highest Frequency
PGOOD Output
V_PGL
I_PGOOD
V_PG
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Thresholds
t_MASK
PGOOD Mask Timer
t_DELAY
MCH_PG Delay Time
Operational Amplifier
I_B
Input Bias Current
V_OS
Input Offset Voltage Magnitude
CM
Common Mode Input Voltage Range
CMRR
Common Mode Rejection Ratio
I_CL
Output Source Current
A_VOL
Open-Loop DC Gain
GBP
Gain-Bandwidth Product
SR
Slew Rate
V_O(MAX)
Maximum High Output Voltage
CONDITIONS
V_FREQSET = 0V
V_FREQSET = 1.2V
V_FREQSET = 0V
V_FREQSET ≥ 2.4V
I_PGOOD = 2mA
V_PGOOD = 5V
V_FB with Respect to Set Output Voltage
V_FB Ramping Negative
V_FB Ramping Positive
V_OA+ = V_OA– 1.2V, I_OUT = 1mA
I_OUT = 1mA
I_OUT = 1mA
I_OUT = 1mA
R_L = 2k
I_OUT = 1mA
MIN
TYP
MAX UNITS
–2
–1
µA
320
355
390
kHz
190
210
240
kHz
490
550
610
kHz
0.1
0.3
V
±1
µA
–7
–10
–13
%
7
11
13
%
100
110
120
µs
15
cycles
15
200
0.8
5
0
P_VCC – 1.4
46
70
10
35
30
2
5
P_VCC – 1.2 P_VCC – 0.9
nA
mV
V
dB
mA
V/mV
MHz
V/µs
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: The LTC3735E 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.
Note 3: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
LTC3735EG: T_J = T_A + (P_D • 85°C/W)
LTC3735EUHF: T_J = T_A + (P_D • 34°C/W)
Note 4: The LTC3735 is tested in a feedback loop that servos V_ITH to a
specified voltage and measures the resultant V_FB.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: The minimum on-time condition corresponds to the on inductor
peak-to-peak ripple current ≥40% I_MAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 8: The ATTEN_ERR specification is in addition to the output voltage
accuracy specified at VID code = 010110.
3735fa
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