Datasheet

LTC3610
3
3610ff
electrical characteristics
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C (Note 4). V
IN
= 15V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ΔV
FB(LOADREG)
Feedback Voltage Load Regulation I
TH
= 0.5V to 1.9V (Note 3) –0.05 –0.3 %
I
FB
Feedback Input Current V
FB
= 0.6V –5 ±50 nA
g
m(EA)
Error Amplifier Transconductance I
TH
= 1.2V (Note 3)
●
1.4 1.7 2 mS
V
FCB
Forced Continuous Threshold
●
0.54 0.6 0.66 V
I
FCB
Forced Continuous Pin Current V
FCB
= 0.6V –1 –2 µA
t
ON
On-Time I
ON
= 60µA, V
ON
= 1.5V
I
ON
= 60µA, V
ON
= 0V
170 250
120
310 ns
ns
t
ON(MIN)
Minimum On-Time I
ON
= 180µA, V
ON
= 0V 60 100 ns
t
OFF(MIN)
Minimum Off-Time I
ON
= 30µA, V
ON
= 1.5V 290 500 ns
I
VALLEY(MAX)
Maximum Valley Current V
RNG
= 0.5V, V
FB
= 0.56V, FCB = 0V
V
RNG
= 0V, V
FB
= 0.56V, FCB = 0V
●
●
7
10
16
19
A
A
I
VALLEY(MIN)
Maximum Reverse Valley Current V
RNG
= 0.5V, V
FB
= 0.64V, FCB = 0V
V
RNG
= 0V, V
FB
= 0.64V, FCB = 0V
–6
–9
A
A
ΔV
FB(OV)
Output Overvoltage Fault Threshold 7 10 13 %
V
RUN/SS(ON)
RUN Pin Start Threshold
●
0.8 1.5 2 V
V
RUN/SS(LE)
RUN Pin Latchoff Enable Threshold RUN/SS Pin Rising 4 4.5 V
V
RUN/SS(LT)
RUN Pin Latchoff Threshold RUN/SS Pin Falling 3.5 4.2 V
I
RUN/SS(C)
Soft-Start Charge Current V
RUN/SS
= 0V –0.5 –1.2 –3 µA
I
RUN/SS(D)
Soft-Start Discharge Current V
RUN/SS
= 4.5V, V
FB
= 0V 0.8 1.8 3 µA
V
IN(UVLO)
Undervoltage Lockout V
IN
Falling
●
3.4 3.9 V
V
IN(UVLOR)
Undervoltage Lockout Release V
IN
Rising
●
3.5 4 V
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
12
6.5
16
10
mΩ
mΩ
Internal
V
CC
Regulator
V
INTVCC
Internal V
CC
Voltage 6V < V
IN
< 28V, V
EXTVCC
= 4V
●
4.7 5 5.5 V
ΔV
LDO(LOADREG)
Internal V
CC
Load Regulation I
CC
= 0mA to 20mA, V
EXTVCC
= 4V –0.1 ±2 %
V
EXTVCC
EXTV
CC
Switchover Voltage I
CC
= 20mA, V
EXTVCC
Rising
●
4.5 4.7 V
ΔV
EXTVCC
EXTV
CC
Switch Drop Voltage I
CC
= 20mA, V
EXTVCC
= 5V 150 300 mV
ΔV
EXTVCC(HYS)
EXTV
CC
Switchover Hysteresis 500 mV
PGOOD Output
ΔV
FBH
PGOOD Upper Threshold V
FB
Rising 7 10 13 %
ΔV
FBL
PGOOD Lower Threshold V
FB
Falling –7 –10 –13 %
ΔV
FB(HYS)
PGOOD Hysteresis V
FB
Returning 1 2.5 %
V
PGL
PGOOD Low Voltage I
PGOOD
= 5mA 0.15 0.4 V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note
2: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
as follows:
T
J
= T
A
+ (P
D
• 28°C/W) (θ
JA
is simulated per JESD51-7 high effective
thermal conductivity test board)
 θ
JC
= 0.24°C/W (θ
JC
is simulated when heat sink is applied at the
bottom of the package).
Note 3: The LTC3610 is tested in a feedback loop that adjusts V
FB
to
achieve a specified error amplifier output voltage (I
TH
).
Note 4: The LTC3610 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3610E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3610I is guaranteed over the
full –40°C to 125°C operating junction temperature range. Note that
the maximum ambient temperature is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
resistance and other environmental factors.