參數(shù)資料
型號(hào)： LTC1705EGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO
中文描述： 5 A DUAL SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO28
封裝： 0.150 INCH, PLASTIC, SSOP-28
文件頁(yè)數(shù)： 3/28頁(yè)
文件大?。?/td> 326K
代理商： LTC1705EGN
LTC1705
3
ELECTRICAL CHARACTERISTICS
The
G
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25
°
C.
V
CC
= PV
CC
= BOOST = 5V, V
INCLK
= 3.3V unless otherwise specified. (Note 3)
SYMBOL
A
FB
GBW
I
COMP
V
PGOOD
PARAMETER
Feedback Amplifier DC Gain
Feedback Amplifier Gain Bandwidth Product
Feedback Amplifier Output Sink/Source Current
Negative Power Good Threshold
Positive Power Good Threshold
Current Limit Amplifier DC Gain
I
MAX
Source Current
Core, I/O Supply Switching Characteristics
f
OSC
Oscillator Frequency
Φ
OSC
Core and I/O Oscillator Phase Difference
DC
MAX
Maximum Duty Cycle
t
NOV
Driver Nonoverlap
t
r
, t
f
Driver Rise/Fall Time
Clock Supply Output
V
OUTCLK
CLK Output Voltage
dV
OUTCLK
Output Voltage Line Regulation
Output Voltage Load Regulation
ILM
CLK
CLK Output Short-Circuit Current
V
DROPOUT
CLK Output Dropout Voltage
V
PGOOD
Negative V
OUTCLK
Power Good Threshold
Positive V
OUTCLK
Power Good Threshold
VID Inputs
R1
Resistance Across SENSEC and FBC
R
VID
VID Input Pull-Up Resistance
V
VID
VID Input Threshold
PGOOD
I
PGOOD
V
PGOOD
Sink Current
CONDITIONS
MIN
74
TYP
85
20
±
10
–10
10
60
–10
MAX
UNITS
G
dB
f = 100kHz (Note 7)
MHz
mA
G
±
3
–15
6
40
–12
Relative to Nominal Output Voltage
G
G
–6
15
%
%
dB
μ
A
A
ILIM
I
IMAX
G
V
IMAXC
= V
IMAXIO
= 0V
G
–8
Test Circuit 1
(Note 7)
G
460
550
180
90
25
15
650
kHz
DEG
G
87
10
93
120
100
%
ns
ns
Test Circuit 1, 50% to 50%
Test Circuit 1, 10% to 90%
G
G
I
VOUTCLK
= 0mA
V
INCLK
= 3.0V to 5.5V
I
VOUTCLK
= 0mA to 150mA
I
VOUTCLK
= 0V
I
VOUTCLK
= 150mA, d
VOUTCLK
= –1% (Note 8)
Relative to V
OUTCLK
Relative to V
OUTCLK
G
2.45
2.50
±
0.02
–0.05
–240
0.3
–10
10
2.55
±
0.1
V
G
%/V
G
–0.1
%
G
–150
0.5
–6
15
mA
G
V
%
%
G
G
–15
6
10
30
k
k
(Note 9)
G
0.4
1.6
V
Power Good
Power Bad
I
PGOOD
= 1mA
G
G
10
μ
A
mA
10
V
OLPG
T
PGOOD
PGOOD Output Low Voltage
V
PGOOD
Falling Edge Delay
V
PGOOD
Rising Edge Delay
V
PBAD
Pulse
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:
PV
CC
and BV
CC
(V
BOOST
– V
SW
) must be greater than V
GS(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
G
0.03
4
20
20
0.1
8
40
40
V
G
G
G
2
μ
s
μ
s
μ
s
10
10
VID Code Change
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 V
INCLK
– V
DROPOUT
.
Note 9:
Each internal pull-up resistor attached to the VID inputs has a
series diode connected to V
CC
to allow input voltages higher than the V
CC
supply without damage or clamping. (See Block Diagram.)
Note 10:
The core feedback voltage accuracy is guaranteed by the V
SENSE
output voltage accuracy test.
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