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LTC1705 Datasheet(PDF) 3 Page - Linear Technology

No. de Pieza. LTC1705
Descripción  Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO
Descarga  28 Pages
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Fabricante  LINER [Linear Technology]
Página de inicio  http://www.linear.com
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LTC1705 Datasheet(HTML) 3 Page - Linear Technology

 
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LTC1705
3
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VCC = PVCC = BOOST = 5V, VINCLK = 3.3V unless otherwise specified. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
AFB
Feedback Amplifier DC Gain
q
74
85
dB
GBW
Feedback Amplifier Gain Bandwidth Product
f = 100kHz (Note 7)
20
MHz
ICOMP
Feedback Amplifier Output Sink/Source Current
q
±3
±10
mA
VPGOOD
Negative Power Good Threshold
Relative to Nominal Output Voltage
q
–15
–10
– 6
%
Positive Power Good Threshold
q
610
15
%
AILIM
Current Limit Amplifier DC Gain
q
40
60
dB
IIMAX
IMAX Source Current
VIMAXC = VIMAXIO = 0V
q
–12
–10
– 8
µA
Core, I/O Supply Switching Characteristics
fOSC
Oscillator Frequency
Test Circuit 1
q
460
550
650
kHz
ΦOSC
Core and I/O Oscillator Phase Difference
(Note 7)
180
DEG
DCMAX
Maximum Duty Cycle
q
87
90
93
%
tNOV
Driver Nonoverlap
Test Circuit 1, 50% to 50%
q
10
25
120
ns
tr, tf
Driver Rise/Fall Time
Test Circuit 1, 10% to 90%
q
15
100
ns
Clock Supply Output
VOUTCLK CLK Output Voltage
IVOUTCLK = 0mA
q
2.45
2.50
2.55
V
dVOUTCLK Output Voltage Line Regulation
VINCLK = 3.0V to 5.5V
q
±0.02
±0.1
%/V
Output Voltage Load Regulation
IVOUTCLK = 0mA to 150mA
q
– 0.1
– 0.05
%
ILMCLK
CLK Output Short-Circuit Current
IVOUTCLK = 0V
q
– 240
–150
mA
VDROPOUT CLK Output Dropout Voltage
IVOUTCLK = 150mA, dVOUTCLK = –1% (Note 8)
q
0.3
0.5
V
VPGOOD
Negative VOUTCLK Power Good Threshold
Relative to VOUTCLK
q
–15
–10
– 6
%
Positive VOUTCLK Power Good Threshold
Relative to VOUTCLK
q
610
15
%
VID Inputs
R1
Resistance Across SENSEC and FBC
10
k
RVID
VID Input Pull-Up Resistance
(Note 9)
30
k
VVID
VID Input Threshold
q
0.4
1.6
V
PGOOD
IPGOOD
VPGOOD Sink Current
Power Good
q
10
µA
Power Bad
q
10
mA
VOLPG
PGOOD Output Low Voltage
IPGOOD = 1mA
q
0.03
0.1
V
TPGOOD
VPGOOD Falling Edge Delay
q
248
µs
VPGOOD Rising Edge Delay
q
10
20
40
µs
VPBAD Pulse
VID Code Change
q
10
20
40
µs
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1705 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: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 4: PVCC and BVCC (VBOOST – VSW) must be greater than VGS(ON) of
the external MOSFETs to ensure proper operation.
Note 5: Supply current in normal operation is dominated by the current
needed to charge and discharge the capacitance of the external MOSFET
gates. This current varies with supply voltage and the choice of external
MOSFETs.
Note 6: Supply current in shutdown is dominated by external MOSFET
leakage and may be significantly higher than the quiescent current drawn
by the LTC1705, especially at elevated temperature.
Note 7: Guaranteed by design, not subject to test.
Note 8: Dropout voltage is the minimum input-to-output voltage
differential required to maintain regulation at the specified output current.
In dropout, the output voltage will be equal to VINCLK – VDROPOUT.
Note 9: Each internal pull-up resistor attached to the VID inputs has a
series diode connected to VCC to allow input voltages higher than the VCC
supply without damage or clamping. (See Block Diagram.)
Note 10: The core feedback voltage accuracy is guaranteed by the VSENSE
output voltage accuracy test.


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