LTC3709_15 Datasheet, PDF (3/24 Pages) Linear Technology – Fast 2-Phase, No RSENSE Synchronous DC/DC Controller with Tracking/Sequencing

LTC3709
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = DRV_CC = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
Main Control Loop
I_Q
Input DC Supply Current
Normal
Shutdown
2.4
3
25
65
I_FB
V_FB
∆V_FB(LINEREG)
∆V_FB(LOADREG)
g_m(EA)
t_ON
FB Pin Input Current
Feedback Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Error Amplifier Transconductance
On-Time
t_ON(MIN)
t_OFF(MIN)
V_SENSE(MAX)
Minimum On-Time
Minimum Off-Time
Maximum Current Sense Threshold
V_SENSE(MIN) Minimum Current Sense Threshold
∆V_FB(OV)
∆V_FB(UV)
V_RUN/SS(ON)
V_RUN/SS(LE)
V_RUN/SS(LT)
I_RUN/SS(C)
I_RUN/SS(D)
UVLO
UVLO_(HYS)
TG R_UP
TG R_DOWN
BG R_UP
BG R_DOWN
Tracking
Overvoltage Fault Threshold
Undervoltage Fault Threshold
RUN Pin Start Threshold
RUN Pin Latchoff Enable Threshold
RUN Pin Latchoff Threshold
Soft-Start Charge Current
Soft-Start Discharge Current
Undervoltage Lockout
Undervoltage Lockout Hysteresis
TG Driver Pull-Up On-Resistance
TG Driver Pull-Down On-Resistance
BG Driver Pull-Up On-Resistance
BG Driver Pull-Down On-Resistance
I_TH = 1.2V (Note 3)
I_TH = 1.2V (Note 3)
V_CC = 4.5V to 6.5V (Note 3)
I_TH = 0.5V to 2V (Note 3)
I_TH = 1.2V (Note 3)
I_ON = 180µA, V_FCB = 0V
I_ON = 90µA, V_FCB = 0V
I_ON = 540µA
I_ON = 90µA
V_RNG = 1V
V_RNG = 0V
V_RNG = V_CC
V_RNG = 1V
V_RNG = 0V
V_RNG = V_CC
RUN/SS Pin Rising
RUN/SS Pin Falling
V_CC Falling
Measured at V_CC Pin
TG High (Note 5)
TG Low (Note 5)
BG High (Note 5)
BG Low (Note 5)
● 0.594
1.3
90
180
124
86
177
8.5
– 8.5
● 0.8
– 0.5
0.8
– 35
0.600
0.02
– 0.12
1.45
116
233
45
250
144
101
202
– 60
– 40
– 80
10
– 10
1.4
3
2.3
– 1.2
2
3.9
0.2
2
1.5
3
1.5
– 60
0.606
– 0.2
1.6
140
280
100
350
166
119
234
12.5
– 12.5
2
–3
4
4.2
0.35
I_TRACK
V_FB(TRACK)
TRACK Pin Input Current
Feedback Voltage at Tracking
PGOOD Output
I_TH = 1.2V, V_TRACK = 0.2V (Note 3)
V_TRACK = 0.1V, I_TH = 1.2V (Note 3)
V_TRACK = 0.3V, I_TH = 1.2V (Note 3)
V_TRACK = 0.5V, I_TH = 1.2V (Note 3)
–100 –150
90
100 110
290 300 310
490 500 510
∆V_FBH
∆V_FBL
PG Delay
∆V_FB(HYS)
I_PGOOD
V_PGL
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Delay
PGOOD Hysteresis
PGOOD Leakage Current
PGOOD Low Voltage
V_FB Rising
V_FB Falling
V_FB Rising
V_FB Returning
V_PGOOD = 7V
I_PGOOD = 5mA
8.5
10
12.5
– 8.5 – 10 – 12.5
100
3.5
±1
0.2
0.4
UNITS
mA
µA
nA
V
%/V
%
mS
ns
ns
ns
ns
mV
mV
mV
mV
mV
mV
%
%
V
V
V
µA
µA
V
V
Ω
Ω
Ω
Ω
nA
mV
mV
mV
%
%
µs
%
µA
V
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