LTC3610_15 Datasheet, PDF (3/24 Pages) Linear Technology – 24V, 12A Monolithic Synchronous Step-Down DC/DC Converter

LTC3610
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)
I_FB
g_m(EA)
V_FCB
I_FCB
t_ON
t_ON(MIN)
t_OFF(MIN)
I_VALLEY(MAX)
I_VALLEY(MIN)
ΔV_FB(OV)
V_RUN/SS(ON)
V_RUN/SS(LE)
V_RUN/SS(LT)
I_RUN/SS(C)
I_RUN/SS(D)
V_IN(UVLO)
V_IN(UVLOR)
R_DS(ON)
Feedback Voltage Load Regulation
Feedback Input Current
Error Amplifier Transconductance
Forced Continuous Threshold
Forced Continuous Pin Current
On-Time
Minimum On-Time
Minimum Off-Time
Maximum Valley Current
Maximum Reverse Valley Current
Output Overvoltage 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 Release
Top Switch On-Resistance
Bottom Switch On-Resistance
I_TH = 0.5V to 1.9V (Note 3)
V_FB = 0.6V
I_TH = 1.2V (Note 3)
V_FCB = 0.6V
I_ON = 60µA, V_ON = 1.5V
I_ON = 60µA, V_ON = 0V
I_ON = 180µA, V_ON = 0V
I_ON = 30µA, V_ON = 1.5V
V_RNG = 0.5V, V_FB = 0.56V, FCB = 0V
V_RNG = 0V, V_FB = 0.56V, FCB = 0V
V_RNG = 0.5V, V_FB = 0.64V, FCB = 0V
V_RNG = 0V, V_FB = 0.64V, FCB = 0V
RUN/SS Pin Rising
RUN/SS Pin Falling
V_RUN/SS = 0V
V_RUN/SS = 4.5V, V_FB = 0V
V_IN Falling
V_IN Rising
–0.05 –0.3
%
–5
±50
nA
● 1.4
1.7
2
mS
● 0.54
0.6
0.66
V
–1
–2
µA
170
250
310
ns
120
ns
60
100
ns
290
500
ns
●
7
16
A
● 10
19
A
–6
A
–9
A
7
10
13
%
● 0.8
1.5
2
V
4
4.5
V
3.5
4.2
V
–0.5 –1.2
–3
µA
0.8
1.8
3
µA
●
3.4
3.9
V
●
3.5
4
V
12
16
mΩ
6.5
10
mΩ
Internal V_CC Regulator
V_INTVCC
Internal V_CC Voltage
ΔV_LDO(LOADREG) Internal V_CC Load Regulation
V_EXTVCC
EXTV_CC Switchover Voltage
ΔV_EXTVCC
EXTV_CC Switch Drop Voltage
ΔV_EXTVCC(HYS)
EXTV_CC Switchover Hysteresis
PGOOD Output
6V < V_IN < 28V, V_EXTVCC = 4V
I_CC = 0mA to 20mA, V_EXTVCC = 4V
I_CC = 20mA, V_EXTVCC Rising
I_CC = 20mA, V_EXTVCC = 5V
● 4.7
5
5.5
V
–0.1
±2
%
● 4.5
4.7
V
150
300
mV
500
mV
ΔV_FBH
ΔV_FBL
ΔV_FB(HYS)
V_PGL
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
V_FB Rising
V_FB Falling
V_FB Returning
I_PGOOD = 5mA
7
10
13
%
–7
–10
–13
%
1
2.5
%
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.
3610ff