LTC3772_15 Datasheet, PDF (2/20 Pages) Linear Technology – Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller

LTC3772
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (V_IN)........................ – 0.3V to 10V
IPRG, PGATE Voltages ................ – 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
9
7 V_IN
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
LTC3772EDDB
DDB8 PART MARKING
LBNR
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
LTC3772ETS8
TS8 PART MARKING
LTBNQ
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
Normal Operation
SLEEP Mode
Shutdown
UVLO
(Note 4)
V_ITH/RUN = 1.3V
V_ITH/RUN = 0V
V_IN < UVLO Threshold – 100mV
250
375
40
60
8
20
1
5
Undervoltage Lockout (UVLO) Threshold
V_IN Rising
V_IN Falling
●
2.0 2.75
●
1.85 2.60
Start-Up Current Source
V_ITH/RUN = 0V
0.7
1.2
1.7
Shutdown Threshold (at I_TH/RUN)
Regulated Feedback Voltage
Feedback Voltage Line Regulation
V_ITH/RUN Rising
0°C ≤ T_A ≤ 85°C (Note 5)
–40°C ≤ T_A ≤ 85°C (Note 5)
2.75V ≤ V_IN ≤ 9.8V (Note 5)
● 0.3
0.6 0.95
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)
0.2
I_TH/RUN = 1V (Note 5)
–0.2
UNITS
V
µA
µA
µA
µA
V
V
µA
V
V
V
mV/V
%
%
3772f
2