LTC1698
W W
U W
U
W U
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
(Note 1)
VDD, PWRGD ....................................................... 13.2V
Input Voltage
TOP VIEW
ORDER PART
NUMBER
V
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
FG
DD
MARGIN, VFB, OVPIN, ISNSGND, ISNS ... –0.3V to 5.3V
SYNC ..................................................... –14V to 14V
Output Voltage
CG
PGND
SYNC
LTC1698EGN
LTC1698ES
LTC1698IGN
LTC1698IS
V
AUX
GND
I
COMP
OPTODRV
I
V
COMP, ICOMP (Note 2)......................... –0.3V to 5.3V
SNS
V
I
COMP
SNSGND
Power Dissipation.............................................. 500mW
Operating Temperature Range
MARGIN
PWRGD
OVPIN
GN PART MARKING
V
FB
LTC1698E (Note 3)............................ – 40°C to 85°C
LTC1698I........................................... – 40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
1698
1698I
GN PACKAGE
S PACKAGE
16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 130°C/W (GN)
TJMAX = 125°C, θJA = 110°C/W (SO)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● indicates specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VDD = 8V, unless otherwise noted. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
8
MAX
UNITS
V
V
Supply Voltage
●
●
6
12.6
V
V
DD
Undervoltage Lockout
4
UVLO
VDD
I
V
Supply Current
V
C
V
, OVPIN, V , V = 0V,
ISNS ISNSGND
DD
FB
= C = 1000pF, C = 0.1µF,
FG
CG
= 0V
VAUX
1.8
5.0
4
mA
mA
SYNC
f
= 100kHz (Note 5)
SYNC
MARGIN and Error Amplifier
V
Feedback Voltage
MARGIN = Open, V
= 1V (Note 7)
COMP
1.223
1.215
1.233
1.233
1.243
1.251
V
V
FB
●
●
I
Feedback Input Current
MARGIN Voltage
V
= 1.233V
FB
0.05
1.65
16.5
1
µA
V
VFB
V
MARGIN = Open
MARGIN
R
MARGIN Input Resistance
Feedback Voltage Adjustment
kΩ
MARGIN
∆V
V
V
= 3.3V
= 0V
●
●
4
–6
5
–5
6
–4
%
%
FB
MARGIN
MARGIN
G
Error Amplifier Open-Loop DC Gain
Error Amplifier Unity-Gain Bandwidth
Error Amplifier Output Clamp Voltage
V
= 0.8V to 1.2V, Load = 2kΩ, 100pF
COMP
●
65
90
2
dB
MHz
V
ERR
BW
No Load (Note 6)
ERR
CLAMP
VCOMP
V
V
= 0V
2
FB
I
Error Amplifier Source Current
Error Amplifier Sink Current
V
V
= 0V
= 5V, V
●
●
–25
7
–10
5.25
mA
mA
FB
FB
= 1.233V
3
COMP
OPTODRV
G
OPTO
Opto Driver DC Gain
OVPIN, V
, V = 0V
ISNS ISNSGND
●
4.75
5
1
V/V
BW
Opto Driver Unity-Gain Bandwidth
Opto Driver Output High Voltage
No Load (Note 6)
MHz
OPTO
V
V
, OVPIN, V
= 0V, V
= –50mV,
ISNS
OPTOHIGH
FB
ISNSGND
= –10mA
I
●
●
4
5
V
OPTODRV
I
Opto Driver Output Short-Circuit Current OVPIN, V
, V
= 0V, V = 1.233V
–50
–25
–10
mA
OPTOSC
ISNSGND ISNS
FB
1698f
2
Linear [ Linear ]
