LTC3611_15 Datasheet, PDF (4/26 Pages) Linear Technology – 10A, 32V Monolithic Synchronous Step-Down DC/DC Converter

LTC3611
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
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 < 30V, V_EXTVCC = 4V
I_CC = 0mA to 20mA, V_EXTVCC = 4V
I_CC = 20mA, V_EXTVCC Rising
I_CC = 20mA, V_EXTVCC = 5V
l 4.7
5
5.6
V
–0.1
±2
%
l 4.5
4.7
V
150
300
m/V
500
m/V
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 = 1°C/W (θ_JC is simulated when heatsink is applied at the
bottom of the package)
Note 3: The LTC3611 is tested in a feedback loop that adjusts V_FB to
achieve a specified error amplifier output voltage (I_TH). The specification at
85°C is not tested in production. This specification is assured by design,
characterization, and correlation to testing at 125°C.
Note 4: The LTC3611 is tested under pulsed load conditions such that
T_J ≈ T_A. The LTC3611E 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
LTC3611I 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.
Typical Performance Characteristics
Transient Response
V_OUT
200mV/DIV
IL
5A/DIV
I_LOAD
5A/DIV
40µs/DIV
LOAD STEP 0A TO 8A
V_IN = 25V
V_OUT = 2.5V
FCB = 0
FIGURE 6 CIRCUIT
Transient Response
(Discontinuous Mode)
V_OUT
200mV/DIV
3611 G01
IL
5A/DIV
I_LOAD
5A/DIV
40µs/DIV
LOAD = 1A TO 10A
V_IN = 25V
V_OUT = 2.5V
FCB = INTV_CC
FIGURE 6 CIRCUIT
Start-Up
RUN/SS
2V/DIV
3611 G02
V_OUT
1V/DIV
I_L
5A/DIV
40ms/DIV
V_IN = 25V
V_OUT = 2.5V
R_LOAD = 0.5Ω
FIGURE 6 CIRCUIT
3611 G03
3611fd