LTC3726 Datasheet, PDF (2/16 Pages) Linear Technology – Secondary-Side Synchronous Forward Controller

LTC3726
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V_CC ........................................................... – 0.3V to 10V
SW ............................................................... –5V to 50V
ITH, RUN/SS ............................................... – 0.3V to 7V
All Other Pins ............................................ – 0.3V to 10V
Operating Ambient Temperature Range (Note 2)
LTC3726EGN ...................................... – 40°C to 85°C
LTC3726IGN ....................................... – 40°C to 85°C
Operating Junction Temperature (Note 3) ........... 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
SG 1
FG 2
MODE 3
FB/PHASE 4
ITH 5
RUN/SS 6
SLP 7
GND 8
TOP VIEW
16 V_CC
15 PT⁺
14 PT^–
13 PGND
12 SW
11 IS⁺
10 IS^–
9 FS/SYNC
GN PACKAGE
16-LEAD PLASTIC SSOP
T_JMAX = 125°C, θ_JA = 130°C/W
ORDER PART NUMBER
LTC3726EGN
LTC3726IGN
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.
ELECTRICAL CHARACTERISTICS _{The ● indicates specifications which apply over the full operating}
temperature range, otherwise specifications are at T_A = 25°C. V_CC = 7V, GND = PGND = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
Main Control Loop
V_FB
∆V_FB(LINREG)
∆V_FB(LOADREG)
Regulated Feedback Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
(Note 4) ITH = 1.2V
V_CC = 5V to 10V, ITH = 1.2V
Measured in Servo Loop,
ITH = 0.5V to 2V
● 0.594
●
0.600
0.001
– 0.01
0.606
– 0.1
V_ISMAX
Maximum Current Sense Threshold
V_ISOC
Over-Current Shutdown Threshold
g_m
I_RUN/SS(C)
I_RUN/SS(D)
V_RUN/SS
t_ON,MIN
FG, SG R_UP
FG, SG R_DOWN
PT⁺, PT^– R_UP
PR⁺, PT^– R_DOWN
∆V_FB(OV)
Transconductance Amplifier g_m
Soft-Start Charge Current
Soft-Start Discharge Current
RUN/SS Pin ON Threshold
Minimum ON Time
FG, SG Driver Pull-Up On Resistance
FG, SG Driver Pull-Down On Resistance
PT⁺, PT^– Driver Pull-Up Resistance
PT⁺, PT^– Driver Pull-Down Resistance
Output Overvoltage Threshold
R_SENSE Mode, V_IS = 0V
CT Mode, V_IS = 0V
R_SENSE Mode, V_IS = 0V
CT Mode, V_IS = 0V
V_RUN/SS = 2V
V_RUN/SS Rising
FG, SG Low
FG, SG High
PT⁺, PT^– Low
PT⁺, PT^– High
V_FB Rising
68
78
88
1.15
1.28
1.4
87
100
113
1.45
1.65
1.85
2.40
2.75
3.10
–4
–5
–6
3
● 0.4
0.45
0.5
200
1.5
2.3
1.5
2.3
1.5
2.3
1.5
2.3
15
17
19
2
UNITS
V
%/V
%
mV
V
mV
V
mS
µA
µA
V
ns
Ω
Ω
Ω
Ω
%
3726fb