Datasheet

2
LTC1698
1698f
(Note 1)
V
DD
, PWRGD ....................................................... 13.2V
Input Voltage
MARGIN, V
FB
, OVPIN, I
SNSGND
, I
SNS
... –0.3V to 5.3V
SYNC ..................................................... –14V to 14V
Output Voltage
V
COMP
, I
COMP
(Note 2)......................... –0.3V to 5.3V
Power Dissipation.............................................. 500mW
Operating Temperature Range
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
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
LTC1698EGN
LTC1698ES
LTC1698IGN
LTC1698IS
T
JMAX
= 125°C, θ
JA
= 130°C/W (GN)
T
JMAX
= 125°C, θ
JA
= 110°C/W (SO)
GN PACKAGE
16-LEAD PLASTIC SSOP
S PACKAGE
16-LEAD PLASTIC SO
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
V
DD
CG
PGND
GND
OPTODRV
V
COMP
MARGIN
V
FB
FG
SYNC
V
AUX
I
COMP
I
SNS
I
SNSGND
PWRGD
OVPIN
The ● indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 8V, unless otherwise noted. (Note 4)
ELECTRICAL CHARACTERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DD
Supply Voltage ● 6 8 12.6 V
V
UVLO
Undervoltage Lockout 4V
I
VDD
V
DD
Supply Current V
FB
, OVPIN, V
ISNS
, V
ISNSGND
= 0V,
C
FG
= C
CG
= 1000pF, C
VAUX
= 0.1µF,
V
SYNC
= 0V ● 1.8 4 mA
f
SYNC
= 100kHz (Note 5) 5.0 mA
MARGIN and Error Amplifier
V
FB
Feedback Voltage MARGIN = Open, V
COMP
= 1V (Note 7) 1.223 1.233 1.243 V
● 1.215 1.233 1.251 V
I
VFB
Feedback Input Current V
FB
= 1.233V ● 0.05 1 µA
V
MARGIN
MARGIN Voltage MARGIN = Open 1.65 V
R
MARGIN
MARGIN Input Resistance 16.5 kΩ
∆V
FB
Feedback Voltage Adjustment V
MARGIN
= 3.3V ● 456 %
V
MARGIN
= 0V ● –6 –5 –4 %
G
ERR
Error Amplifier Open-Loop DC Gain V
COMP
= 0.8V to 1.2V, Load = 2kΩ, 100pF ● 65 90 dB
BW
ERR
Error Amplifier Unity-Gain Bandwidth No Load (Note 6) 2 MHz
V
CLAMP
Error Amplifier Output Clamp Voltage V
FB
= 0V 2 V
I
VCOMP
Error Amplifier Source Current V
FB
= 0V ● –25 –10 mA
Error Amplifier Sink Current V
FB
= 5V, V
COMP
= 1.233V ● 37 mA
OPTODRV
G
OPTO
Opto Driver DC Gain OVPIN, V
ISNS
, V
ISNSGND
= 0V ● 4.75 5 5.25 V/V
BW
OPTO
Opto Driver Unity-Gain Bandwidth No Load (Note 6) 1 MHz
V
OPTOHIGH
Opto Driver Output High Voltage V
FB
, OVPIN, V
ISNSGND
= 0V, V
ISNS
= –50mV,
I
OPTODRV
= –10mA ● 45 V
I
OPTOSC
Opto Driver Output Short-Circuit Current OVPIN, V
ISNSGND
, V
ISNS
= 0V, V
FB
= 1.233V ● –50 –25 –10 mA
GN PART MARKING
1698
1698I