LTC3613 Datasheet, PDF (4/36 Pages) Linear Technology – 24V, 15A Monolithic Step Down Regulator

LTC3613
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C. SV_IN = 15V, V_FB = V_OSNS+ – V_OSNS–, unless otherwise noted. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Oscillator and Clock Synchronization
f_OSC
Free Running Switching Frequency
CLK_IH
Clock Input High Level Into Mode/PLLIN
CLK_IL
Clock Input Low Level Into Mode/PLLIN
Internal V_CC Regulator and External V_CC
INTV_CC
Internal V_CC Voltage
INTV_CC(%)
Internal V_CC Load Regulation
EXTV_CC(TH)
EXTV_CC Switchover Voltage
EXTV_CC(HYS)
EXTV_CC Switchover Hysteresis
ΔINTV_CC
EXTV_CC Voltage Drop
PGOOD Output
R_T = 205k
R_T = 80.6k
R_T = 38.8k
6V < V_IN < 24V
I_CC = 0mA to 50mA
EXTV_CC Rising
V_EXTVCC = 5V. I_CC = 50mA
175
200
225
kHz
450
500
550
kHz
900 1000 1100
kHz
2
V
0.5
V
5.1
5.3
5.55
V
–1
–2
%
4.4
4.6
4.75
V
200
mV
200
mV
PGD_OV
PGD_UV
PGD_HYS
V_PGD(LO)
t_PGD(FALL)
t_PGD(RISE)
R_DS(ON)
R_DS(ON)
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
Delay from OV/UV Fault to PGOOD Falling
V_FB Rising (With Respect to Regulated
Feedback Voltage V_REG)
V_FB Falling (With Respect to Regulated
Feedback Voltage V_REG)
V_FB Returning
I_PGOOD = 5mA
(Note 5)
Delay from OV/UV Recovery to PGOOD Rising (Note 5)
Top Switch On-Resistance
Bottom Switch On-Resistance
5
7.5
10
%
–10 –7.5
–5
%
2
%
0.15
0.4
V
20
μs
10
μs
7.5
mohm
5.5
mohm
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
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 • 29°C/W) (θ_JA is simulated per JESD51-7 high effective
thermal conductivity test board)
θ_JC =1°C/W (θ_JC is simulated when heat sink is applied at the bottom
of the package.)
Note 3: The LTC3613 is tested in a feedback loop that adjusts V_FB = V_OSNS+
– V_OSNS– to achieve a specified error amplifier output voltage (ITH).
Note 4: The LTC3613 is tested under pulsed load conditions such that
T_J ≈ T_A. The LTC3613E is guaranteed to meet specifications from
0°C to 125°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3613I is guaranteed over the full –40°C to 125°C operating junction
temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
Note 5: Delay times are measured using 50% levels.
3613fa
4