Datasheet

2
LTC1772
1772fb
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input DC Supply Current Typicals at V
IN
= 4.2V (Note 4)
Normal Operation 2.4V ≤ V
IN
≤ 9.8V 270 420 µA
Sleep Mode 2.4V ≤ V
IN
≤ 9.8V 230 370 µA
Shutdown 2.4V ≤ V
IN
≤ 9.8V, V
ITH
/RUN = 0V 8 22 µA
UVLO V
IN
< UVLO Threshold 6 10 µA
Undervoltage Lockout Threshold V
IN
Falling (LTC1772C) ● 1.60 2.00 2.30 V
V
IN
Falling (LTC1772E, LTC1772I, LTC1772H) ● 1.55 2.00 2.35 V
V
IN
Rising 1.85 2.10 2.40 V
Shutdown Threshold (at I
TH
/RUN) (LTC1772C) ● 0.20 0.35 0.50 V
(LTC1772E, LTC1772I, LTC1772H)
● 0.15 0.35 0.55 V
Start-Up Current Source V
ITH
/RUN = 0V 0.25 0.5 0.85 µA
Regulated Feedback Voltage (Note 5) (LTC1772C) ● 0.780 0.800 0.820 V
(Note 5) (LTC1772E, LTC1772I, LTC1772H)
● 0.770 0.800 0.830 V
Output Voltage Line Regulation 2.4V ≤ V
IN
≤ 9.8V (Note 5) 0.05 mV/V
Output Voltage Load Regulation I
TH
/RUN Sinking 5µA (Note 5) 2.5 mV/µA
I
TH
/RUN Sourcing 5µA (Note 5) 2.5 mV/µA
V
FB
Input Current (Note 5) 10 50 nA
Overvoltage Protect Threshold Measured at V
FB
0.820 0.860 0.895 V
Overvoltage Protect Hysteresis 20 mV
Oscillator Frequency V
FB
= 0.8V 500 550 650 kHz
V
FB
= 0V 120 kHz
Gate Drive Rise Time C
LOAD
= 3000pF 40 ns
Gate Drive Fall Time C
LOAD
= 3000pF 40 ns
Peak Current Sense Voltage (Note 6) 120 mV
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
S6 PART MARKING
ORDER PART NUMBER
LTC1772CS6
LTC1772ES6
LTC1772IS6
LTC1772HS6
LTIL
LTIM
LTB7
LTBRY
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 4.2V unless otherwise specified. (Note 2)
(Note 1)
Input Supply Voltage (V
IN
).........................– 0.3V to 10V
SENSE
–
, PGATE Voltages ............. –0.3V to (V
IN
+ 0.3V)
V
FB
, I
TH
/RUN Voltages .............................–0.3V to 2.4V
PGATE Peak Output Current (<10µs) ......................... 1A
Storage Ambient Temperature Range ... –65°C to 150°C
Operating Temperature Range
LTC1772CS6 ........................................... 0°C to 70°C
LTC1772ES6 (Note 2) ........................ – 40°C to 85°C
LTC1772IS6 (Note 2) ......................... – 40°C to 85°C
LTC1772HS6 (Notes 2,3) ................. –40°C to 140°C
Junction Temperature (Note 3)............................. 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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/
θ
JA
= 230°C/ W
1
2
3
I
TH
/RUN
GND
V
FB
6
5
4
PGATE
V
IN
SENSE
–
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC SOT-23