LTC3734 Datasheet, PDF (4/28 Pages) Linear Technology – Single-Phase, High Efficiency DC/DC Controller for Intel Mobile CPUs

LTC3734
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_PVCC = V_SVCC = 5V, V_RUN/SS = 5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP MAX UNITS
Operational Amp
IB
VOS
CM
CMRR
ICL
AVOL
GBP
SR
VO(MAX)
Input Bias Current
Input Offset Voltage Magnitude
Common Mode Input Voltage Range
Common Mode Rejection Ratio
Output Source Current
Open-Loop DC Gain
Gain-Bandwidth Product
Slew Rate
Maximum High Output Voltage
VOA+ = VOA– 1.2V, IOUT = 1mA
IOUT = 1mA
IOUT = 1mA
IOUT = 1mA
RL = 2k
IOUT = 1mA
15
200
0.8
5
0
PVCC – 1.4
46
70
10
35
30
2
5
PVCC – 1.2PVCC – 0.9
nA
mV
V
dB
mA
V/mV
MHz
V/μs
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3734E 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:
LTC3734EUH: T_J = T_A + (P_D • 34°C/W)
Note 4: The LTC3734 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.
TYPICAL PERFOR A CE CHARACTERISTICS
Active Mode Efficiency
(VID = 1.186V, PSI = 0) (Figure 9)
100
90
V_IN = 20V
80
V_IN = 7.5V
70
Deeper Sleep Mode Efficiency
(Figure 9)
90
V_IN = 7.5V
80
V_IN = 20V
70
60
0
2
4
6
8
10
I_OUT (A)
3735 GO1
60
0.01
0.1
1
I_OUT (A)
10
3734 G02
Efficiency vs Input Voltage
(Figure 9)
100
I_OUT = 20A
V_OUT = 1.6V
90
80
70
60
50
5
10
15
INPUT VOLTAGE (V)
20
3734 G03
3734f
4