LTC3772B Datasheet, PDF (2/20 Pages) Linear Technology – Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller

LTC3772B
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (V_IN)........................ – 0.3V to 10V
IPRG Voltage ............................... – 0.3V to (V_IN + 0.3V)
V_FB, I_TH/RUN Voltages ............................. – 0.3V to 2.4V
SW Voltage ........... – 2V to (V_IN + 1V) or 10V Maximum
PGATE 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 125°C
Lead Temperature (Soldering, 10 sec)
TSOT-23 ........................................................... 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
GND 1
8 PGATE
V_FB 2
7 V_IN
9
I_TH/RUN 3
6 SW
I_PRG 4
5 NC
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
T_JMAX = 125°C, θ_JA = 76°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER DDB PART MARKING
LTC3772BEDDB
LBWP
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/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
I_PRG 1
I_TH/RUN 2
V_FB 3
GND 4
8 NC
7 SW
6 V_IN
5 PGATE
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T_JMAX = 125°C, θ_JA = 230°C/W
ORDER PART NUMBER
LTC3772BETS8
TS8 PART MARKING
LTBWN
ELECTRICAL CHARACTERISTICS The ● indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 4.2V unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX
Input Voltage Range
● 2.75
9.8
Input DC Supply Current
No Load
Shutdown
UVLO
Undervoltage Lockout (UVLO) Threshold
(Note 4)
V_FB = 0.83V
V_ITH/RUN = 0V
V_IN < UVLO Threshold – 100mV
V_IN Rising
V_IN Falling
200
325
8
20
1
5
●
2.0 2.75
●
1.85 2.60
Start-Up Current Source
Shutdown Threshold (at I_TH/RUN)
V_ITH/RUN = 0V
V_ITH/RUN Rising
0.7
● 0.3
1.2
1.7
0.6 0.95
Regulated Feedback Voltage
Feedback Voltage Line Regulation
0°C ≤ T_A ≤ 85°C (Note 5)
–40°C ≤ T_A ≤ 85°C (Note 5)
2.75V ≤ V_IN ≤ 9V (Note 5)
0.788 0.800 0.812
● 0.780 0.800 0.812
0.08
0.2
Feedback Voltage Load Regulation
I_TH/RUN = 1.6V (Note 5)
I_TH/RUN = 1V (Note 5)
0.5
0.2
–0.5 –0.2
UNITS
V
µA
µA
µA
V
V
µA
V
V
V
mV/V
%
%
3772bfa
2