LTC1698EGN Linear Technology, LTC1698EGN Datasheet - Page 3

• Manufacturer Part Number: LTC1698EGN
• Description: IC PREC RECT CONTROLLER 16-SSOP
• Manufacturer: Linear Technology

Specifications of LTC1698EGN

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 400kHz
• Voltage - Supply: 6 V ~ 12.6 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-SSOP
• Frequency-max: 400kHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Duty Cycle: -

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL PARAMETER
V
V
Current Limit Amplifier
I
I
V
I
g
G
PWRGD and OVP Comparators
V
I
V
V
I
t
t
SYNC and Drivers
V
V
I
f
t
t
t
t
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired. All voltages refer to GND.
Note 2: The LTC1698 incorporates a 5V linear regulator to power internal
circuitry. Driving these pins above 5.3V may cause excessive current flow.
Guaranteed by design and not subject to test.
Note 3: The LTC1698E 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. For guaranteed performance to
specifications over the –40 C to 85 C range, the LTC1698I is available.
Note 4: All currents into device pins are positive; all currents out of the
device pins are negative. All voltages are referenced to ground unless
otherwise specified. For applications with V
Performance Characteristics.
ISNSGND
ISNS
ICOMP
PWRGD
OVPIN
PWRGD
OVP
SYNC
SYNC
d
SYNC
r
DDIS
mILIM
AUX
AUX
ILIMTH
PWRGD
OL
OVPREF
PT
NT
, t
ICOMP
f
Auxiliary Supply Voltage
I
I
Current Limit Threshold
(V
I
I
Current Limit Amplifier
Transconductance
Current Limit Amplifier
Open-Loop DC Gain
Percent Below V
Power Good Sink Current
Power Good Output Low Voltage
OVPIN Threshold
OVPIN Input Bias Current
Power Good Response Time
Power Bad Response Time
Overvoltage Response Time
SYNC Input Positive Threshold
SYNC Input Negative Threshold
SYNC Input Current
SYNC Frequency Range
SYNC Input to Driver Output Delay
Minimum SYNC Pulse Width
Driver Rise and Fall Time
Driver Disable Time-Out
SNSGND
SNS
COMP
COMP
ISNS
Input Current
Source Current
Sink Current
– V
Input Current
ISNSGND
FB
)
DD
< 7V, refer to the Typical
CONDITIONS
C
V
V
V
V
V
V
V
V
V
V
I
V
V
V
V
V
V
C
C
f
C
10% to 90%
C
Measured from CG (Note 10)
PWRGD
SYNC
VAUX
ISNSGND
ISNS
ICOMP
ISNSGND
ISNSGND
ISNSGND
ICOMP
FB
FB
FB
FB
OVPIN
FB
FB
OVPIN
SYNC
FG
FG
FG
FG
= 2V
= 0V
= V
= C
= C
= C
= C
, MARGIN = Open (Note 9)
= 100kHz, V
= 0V
= 0.1 F, I
= 10V
= 1.233V
ISNS
CG
CG
CG
CG
= 2.5V, V
= 2.5V, No Load
= 3mA, V
, C
A
= 0V
= 0V, V
= 0V, V
= 0V, V
= 1000pF, V
= 1000pF, f
= 1000pF, f
= 1000pF, f
= 25 C. V
OPTODRV
= V
ISNSGND
LOAD
The
ISNSGND
ISNS
ISNS
ICOMP
FB
SYNC
= 0V
= 0.1 F
= 0mA to 10mA, V
= – 0.3V, V
= 0.3V, V
SYNC
SYNC
SYNC
DD
SYNC
= 10V (Note 6)
= 2.5V, I
= 0V, OVPIN (Note 9)
indicates specifications which apply over the full operating
= 0V
= 8V, unless otherwise noted. (Note 4)
= 100kHz, V
= 100kHz, V
= 100kHz, V
= 5V
Note 5: Supply current in active operation is dominated by the current
needed to charge and discharge the external FET gates. This will vary with
the LTC1698 operating frequency, supply voltage and the external FETs
used.
Note 6: This parameter is guaranteed by correlation and is not tested.
Note 7: V
internal bandgap voltage.
Note 8: The current comparator output current varies linearly with
temperature.
Note 9: The PWRGD and OVP comparators incorporate 10mV of
hysteresis.
Note 10: The driver disable time-out is proportional to the SYNC period
within the frequency synchronization range.
ICOMP
ICOMP
ICOMP
= 2.5V (Note 8)
= 10 A
FB
= 2.5V (Note 8)
SYNC
SYNC
SYNC
DD
is tested in an op amp feedback loop which servos V
= 7V to 12.6V
= 5V
= 5V,
= 5V
– 27.0
– 27.5
3.135
– 280
– 370
– 2.2
1.18
MIN
120
2.2
0.5
80
48
– 9
10
50
75
10
1
1
3.320
1.233
– 200
– 200
0.05
0.05
–1.6
TYP
– 25
– 25
200
200
3.5
0.1
1.6
– 6
60
40
10
15
2
1
5
1
LTC1698
– 23.0
– 22.5
3.465
– 120
MAX
1.28
– 80
280
370
400
0.4
2.5
2.2
– 3
–1
10
20
50
90
40
20
5
1
1
1
5
FB
millimho
to the
UNITS
3
1698f
kHz
mV
mV
mA
ms
ms
dB
ns
ns
ns
%
V
A
A
A
A
A
A
A
V
V
A
V
V
A
s
s