Datasheet

LTC1700
2
1700fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
SOP
Start-Up Minimum Operating Voltage (Note 4) 0.9 1.8 V
V
OP
Minimum Operating Voltage (Note 5) V
OUT
Ramping Up 2.34 2.6 V
Hysteresis 90 mV
I
S
Input DC Supply Current (Note 6)
Normal Mode V
FB
= 1.6V, V
MODE
= 0V, V
RUN/SS
= 3V 536 620 µA
Sleep Mode V
FB
= 1.6V, V
MODE
= 3V, V
RUN/SS
= 3V 179 210 µA
Start-Up Mode V
FB
= 0V, V
MODE
, V
RUN/SS,
V
OUT
= 1.8V 35 45 µA
Shutdown V
FB
= 0V, V
MODE
= 3V, V
RUN/SS
= 0V 10 14 µA
I
VFB
Feedback Current V
FB
= 1.20V 1 50 nA
V
FB
Regulated Output Voltage (Note 7) ● 1.187 1.205 1.223 V
∆V
OSENS
Reference Voltage Line Regulation V
IN
= 2.7V to 5V (Note 7) 0.0106 0.080 %/V
V
LOADREG
Output Voltage Load Regulation Measured in Servo Loop; V
ITH
= 0.3V to 0.9V 0.036 0.065 %
V
OVL
Output Overvoltage Lockout Reference to Nominal V
FB
2.5 4.8 9 %
V
RUN/SS
Shutdown Threshold V
RUN/SS
Ramping Up ● 0.7 1.09 1.2 V
I
RUN/SS
Soft-Start Current Source V
RUN/SS
= 0V 2 3.79 6 µA
f
OSC
Oscillator Frequency V
OUT
= 4.2V ● 460 530 680 kHz
Start-Up Oscillator Frequency V
OUT
= 1.8V, V
RUN/SS
= 1.8V, V
SW
= 1.1V 150 225 kHz
V
SYNC/MODE
SYNC/MODE Threshold V
SYNC/MODE
Ramping Down from 1.2V 1.03 1.13 1.25 V
DC MAX Maximum Duty Cycle f
OSC
= 550kHz 84 88 92 %
∆V
SENSE(MAX)
Maximum Current Sense Voltage ● 55 78 100 mV
63 mV
I
LIMIT
Current Limit At Start-Up V
OUT
= 1.8V 40 60 mA
g
m
Transconductance of Error Amplifier V
FB
= V
REF
± 10mV 0.65 0.9 1.30
ORDER PART
NUMBER
MS PART
MARKING
T
JMAX
= 125°C, θ
JA
= 150°C/W
LTLC
LTC1700EMS
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25 ° C. V
OUT
= 3V unless otherwise specified.
Output Supply Voltage (V
OUT
) .....................–0.3V to 6V
RUN/SS, V
FB
Voltages ..............................–0.3V to 2.4V
SYNC/MODE, I
TH
Voltages ...........................– 0.3V to 6V
SWITCH Voltage (SW) ..............................–0.3V to 6.5V
TG, BG Peak Output Current (<10µs)......................... 1A
Operating Temperature Range (Note 2) ...–40°C to 85°C
Junction Temperature (Note 3)............................. 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
1
2
3
4
5
SGND
I
TH
V
FB
RUN/SS
SYNC/MODE
10
9
8
7
6
SW
PGND
BG
V
OUT
TG
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
Ω
m
Consult LTC Marketing for parts specified with wider operating temperature ranges.