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LTC1709 Datasheet(PDF) 4 Page - Linear Technology

Part No. LTC1709
Description  2-Phase, 5-Bit Adjustable, High Efficiency, Synchronous Step-Down Switching Regulator
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1709 Datasheet(HTML) 4 Page - Linear Technology

 
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LTC1709
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS = 5V unless otherwise noted.
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% IMAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 8: Each built-in pull-up resistor attached to the VID inputs also has a
series diode to allow input voltages higher than the VIDVCC supply without
damage or clamping (see the Applications Information section).
Note 9: When the AMPMD pin is high, the IC pins are connected directly to
the internal op amp inputs. When the AMPMD pin is low, internal MOSFET
switches connect four 40k resistors around the op amp to create a
standard unity-gain differential amp.
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2: The LTC1709EG 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: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1709EG: TJ = TA + (PD • 85°C/W)
Note 4: The LTC1709 is tested in a feedback loop that servos VITH to a
specified voltage and measures the resultant VEAIN.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RIN
Input Resistance
Differential Amp Mode; Measured at VOS+ Input
80
k
VOS
Input Offset Voltage
Op Amp Mode; VCM = 2.5V; VDIFFOUT = 5V;
6
mV
IDIFFOUT = 1mA
IB
Input Bias Current
Op Amp Mode
30
200
nA
AOL
Open Loop DC Gain
Op Amp Mode; 0.7V
≤ VDIFFOUT < 10V
5000
V/mV
VCM
Common Mode Input Voltage Range
Op Amp Mode
0
3
V
CMRROA
Common Mode Rejection Ratio
Op Amp Mode; 0V < VCM < 3V
70
90
dB
PSRROA
Power Supply Rejection Ratio
Op Amp Mode; 6V < VIN < 30V
70
90
dB
ICL
Maximum Output Current
Op Amp Mode; VDIFFOUT = 0V
10
35
mA
VO(MAX)
Maximum Output Voltage
Op Amp Mode; IDIFFOUT = 1mA
10
11
V
GBW
Gain-Bandwidth Product
Op Amp Mode; IDIFFOUT = 1mA
2
MHz
SR
Slew Rate
Op Amp Mode; RL = 2k
5
V/
µs
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Output Current
(Figure 12)
Efficiency vs Output Current
(Figure 12)
Efficiency vs Input Voltage
(Figure 12)
OUTPUT CURRENT (A)
100
80
60
40
20
0
1709 G01
0.1
1
10
100
VOUT = 2V
VEXTVCC = 0V
f = 200kHz
VIN = 5V
VIN = 8V
VIN = 12V
VIN = 20V
OUTPUT CURRENT (A)
1709 G02
100
80
60
40
20
0
0.1
1
10
100
VOUT = 2V
VIN = 12V
f = 200kHz
INTERNAL LDO VS EXTERNALLY
APPLIED 5V OVERALL EFFICIENCY
(FIGURE 12)
VEXTVCC = 5V
VEXTVCC = 0V
VIN (V)
5
100
90
80
70
1709 G03
10
15
20
VOUT = 3.3V
VEXTVCC = 5V
IOUT = 20A


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