Datasheet LTC3609 (Analog Devices) - 4

LTC3609 e

lecTrical characTerisTics
The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Internal VCC Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 30V, VEXTVCC = 4V l 4.7 5 5.5 V ∆VLDO(LOADREG) Internal VCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 4V –0.1 ±2 % VEXTVCC EXTVCC Switchover Voltage ICC = 20mA, VEXTVCC Rising l 4.5 4.7 V ∆VEXTVCC EXTVCC Switch Drop Voltage ICC = 20mA, VEXTVCC = 5V 150 300 mV ∆VEXTVCC(HYS) EXTVCC Switchover Hysteresis 500 mV
PGOOD Output
∆VFBH PGOOD Upper Threshold VFB Rising 7 10 13 % ∆VFBL PGOOD Lower Threshold VFB Falling –7 –10 –13 % ∆VFB(HYS) PGOOD Hysteresis VFB Returning 1 2.5 % VPGL PGOOD Low Voltage IPGOOD = 5mA 0.15 0.4 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3609 is tested under pulsed load conditions such that may cause permanent damage to the device. Exposure to any Absolute TJ ≈ TA. The LTC3609E is guaranteed to meet specifications from Maximum Rating condition for extended periods may affect device 0°C to 125°C junction temperature. Specifications over the –40°C to reliability and lifetime. 125°C operating junction temperature range are assured by design,
Note 2:
T characterization and correlation with statistical process controls. The J is calculated from the ambient temperature TA and power dissipation P LTC3609I is guaranteed over the full –40°C to 125°C operating junction D as follows: T temperature range. Note that the maximum ambient temperature J = TA + (PD • 29°C/W) (θJA is simulated per JESD51-7 high effective thermal conductivity test board). consistent with these specifications is determined by specific operating θ conditions in conjunction with board layout, the rated package thermal JC = 1°C/W (θJC is simulated when heat sink is applied at the bottom of the package). impedance and other environmental factors.
Note 3:
The LTC3609 is tested in a feedback loop that adjusts VFB to achieve a specified error amplifier output voltage (ITH). The specification at 85°C is not tested in production. This specification is assured by design, characterization, and correlation to testing at 125°C. Typical perForMance characTerisTics
Transient Response Transient Response (Discontinuous Mode) Start-Up
VOUT VOUT 200mV/DIV 200mV/DIV RUN/SS 2V/DIV I IL L 5A/DIV 5A/DIV VOUT 1V/DIV I I LOAD LOAD I 5A/DIV 5A/DIV L 5A/DIV 3609 G01 20µs/DIV 3609 G02 20µs/DIV 3609 G03 40ms/DIV LOAD STEP 0A TO 5A LOAD STEP 1A TO 6A VIN = 12V VIN = 25V VIN = 25V VOUT = 2.5V VOUT = 2.5V VOUT = 2.5V RLOAD = 0.5Ω FCB = 0V FCB = INTVCC FIGURE 6 CIRCUIT FIGURE 6 CIRCUIT FIGURE 6 CIRCUIT 3609fb Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts