ISL70001SRH Datasheet, PDF (8/16 Pages) Intersil Corporation – Radiation Hardened and SEE Hardened 6A Synchronous Buck Regulator with Integrated MOSFETs

ISL70001SRH
Electrical Specifications Unless otherwise noted, V_IN = AVDD = DVDD = PVINx = EN = M/S = 3V or 5.5V; GND = AGND
= DGND = PGNDx = TDI = TDO = ZAP = 0V; FB = 0.65V; PORSEL = V_IN for 4.5V ≤ V_IN ≤ 5.5V
and GND for V_IN < 4.5V, SYNC = LXx = Open Circuit; PGOOD is pulled up to V_IN with a 1k
resistor; REF is bypassed to GND with a 220nF capacitor; SS is bypassed to GND with a 100nF
capacitor; I_OUT = 0A; T_A = T_J = +25°C. (Note 3) (Continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
POWER-ON RESET
POR Select (PORSEL)
Input High Threshold
1.4
V
Input Low Threshold
1.2
V
POR Select (PORSEL) Input Leakage V_IN = 5.5V, PORSEL = GND or V_IN
Current
0
µA
VIN POR
Rising Threshold, PORSEL = V_IN
Hysteresis, PORSEL = V_IN
Rising Threshold, PORSEL = GND
4.25
V
325
mV
2.8
V
Hysteresis, PORSEL = GND
175
mV
Enable (EN) Input Voltage
Rising/Falling Threshold
0.6
V
Enable (EN) Input Leakage Current
Enable (EN) Sink Current
V_IN = 5.5V, EN = GND or V_IN
EN = 0.3V
0
µA
11
µA
SOFT-START
Soft-Start Source Current
SS = GND
23
µA
Soft-Start Discharge ON-Resistance
2.2
Ω
Soft-Start Discharge Time
256
Clock Cycles
POWER-GOOD SIGNAL
Rising Threshold
Rising Hysteresis
Falling Threshold
Falling Hysteresis
Power-Good Drive
Power-Good Leakage
PROTECTION FEATURES
V_FB as a % of V_REF, Test Mode
V_FB as a % of V_REF, Test Mode
V_FB as a % of V_REF, Test Mode
V_FB as a % of V_REF, Test Mode
V_IN = 3V, PGOOD = 0.4V, EN = GND
V_IN = PGOOD = 5.5V
111
%
3.5
%
89
%
3.5
%
mA
0
µA
Undervoltage Monitor
Undervoltage Trip Threshold
V_IN = 3V, V_FB as a % of V_REF, Test mode
75
%
Undervoltage Recovery Threshold
V_IN = 3V, V_FB as a % of V_REF, Test mode
88
%
Overcurrent Monitor
Overcurrent Trip Level
LX4 Power Block, Test Mode, (Note 6)
1.9
A
Overcurrent or Short-Circuit
V_IN = 3V, SS interval = 200µs, Test Mode,
0.8
%
Duty-Cycle
Fault interval divided by hiccup interval
NOTES:
3. Typical values shown are not guaranteed.
4. Limits do not include tolerance of external feedback resistors. The 0A to 6A output current range may be reduced by Minimum LXx
On Time and Minimum LXx Off Time specifications.
5. Limits established by characterization or analysis and are not production tested.
6. During an output short-circuit, peak current through the power block(s) can continue to build beyond the overcurrent trip level by
up to 3A. With all six power blocks connected, peak current through the power blocks and output inductor could reach (6 x 2.5A)
+ 3A = 18A. The output inductor must support this peak current without saturating.
8
FN6947.0
December 15, 2009