Datasheet

LTC1773
2
1773fb
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VFB
Feedback Current (Note 4) 20 60 nA
V
FB
Regulated Feedback Voltage (Note 4) ● 0.788 0.80 0.812 V
∆V
OVL
∆Output Overvoltage Lockout ∆V
OVL
= V
OVL
– V
FB
40 60 80 mV
∆V
FB
Reference Voltage Line Regulation V
IN
= 2.7V to 8.5V (Note 4) 0.002 0.02 %/V
V
LOADREG
Output Voltage Load Regulation I
TH
at 1.0V (Note 4) 0.2 0.8 %
I
TH
at 0.6V (Note 4) –0.2 –0.8 %
I
S
Input DC Bias Current (Note 5)
Normal Mode V
IN
= 5V, V
ITH
= OPEN, V
SYNC/MODE
= OPEN 400 600 µA
Burst Mode Operation V
ITH
= 0V, V
IN
= 5V, V
SYNC/MODE
= OPEN 80 µA
Shutdown V
RUN/SS
= 0V, 2.7V < V
IN
< 8.5V 10 30 µA
Shutdown V
RUN/SS
= 0V, V
IN
< 2.4V 2 5 µA
V
RUN/SS
RUN/SS Threshold 0.4 0.7 1.0 V
I
RUN/SS
Soft-Start Current Source V
RUN/SS
= 0V 0.75 1.5 2.5 µA
V
SYNC/FCB
Auxiliary Feedback Threshold V
SYNC/FCB
Ramping Negative 0.76 0.8 0.84 V
I
SYNC/FCB
SYNC/FCB Pull-Up Current V
SYNC/FCB
= 0V 0.1 0.4 1.0 µA
f
OSC
Oscillator Frequency V
FB
= 0.8V 500 550 600 kHz
V
FB
= 0V 55 kHz
V
UVLO
Undervoltage Lockout V
IN
Ramping Down from 3V ● 2.35 2.5 2.65 V
V
IN
Ramping Up from 0V ● 2.65 2.8 V
∆
VSENSE(MAX
) Maximum Current Sense Voltage ● 85 100 115 mV
TG t
r
Top Gate Drive Rise Time C
LOAD
= 3000pF (Note 6) 45 160 ns
TG t
f
Top Gate Drive Fall Time C
LOAD
= 3000pF (Note 6) 48 150 ns
BG t
r
Bottom Gate Drive Rise Time C
LOAD
= 3000pF (Note 6) 80 180 ns
BG t
f
Bottom Gate Drive Fall Time C
LOAD
= 3000pF (Note 6) 45 150 ns
Input Supply Voltage .............................. –0.3V to 10.0V
I
TH
Voltage ................................................ –0.3V to 2.5V
RUN/SS, V
FB,
SENSE
–
Voltages .................. –0.3V to V
IN
SYNC/FCB Voltage ...................................... –0.3V to V
IN
BG, TG Voltages...........................................–0.3V to V
IN
SW Voltage ...................................................–5V to 11V
Operating Ambient 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
ORDER PART
NUMBER
T
JMAX
= 125°C, θ
JA
= 120°C/W
LTC1773EMS
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
ELECTRICAL CHARACTERISTICS
MS PART MARKING
The ● denotes specifications which apply over the full operating
temperature range, T
A
= 25 ° C. V
IN
= 5V unless otherwise specified.
LTMV
1
2
3
4
5
I
TH
RUN/SS
SYNC/FCB
V
FB
GND
10
9
8
7
6
SW
SENSE
–
V
IN
TG
BG
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/