Note 1: Specifications to -40°C are guaranteed by design, and not production tested.
Note 2: When the inductor is in continuous conduction, the output voltage will have a DC regulation higher than the trip level by
50% of the ripple. In discontinuous conduction (SKIP = AGND, light load) the output voltage will have DC regulation
higher than the trip level by approximately 1.5% due to slope compensation.
Note 3: On-time and off-time specifications are measured from the 50% point at the DH pin with LX = PGND, V
BST
= 5V. Actual
in-circuit times may differ due to MOSFET switching speeds.
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, components from Table 1, V
IN
= +15V, SKIP = AGND, TON = unconnected, T
A
= +25°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, 4A components from Table 1, V
CC =
V
DD
= +5V, SKIP = AGND, V+ = 15V, T
A
= -40°C to +85°C, unless otherwise
noted.) (Note 1)
Quiescent Battery Current (V+) 25 70 µA
Reference Voltage 1.97 2 2.03 VNo external REF load
Quiescent Supply Current
(V
CC
+ V
DD
)
1100 1600 µAFB1 and FB2 forced above the regulation point
PARAMETER MIN TYP MAX UNITSCONDITIONS
Reference Load Regulation 0.01 VI
REF
= 0 to 50µA
Overvoltage Trip Threshold 10 12.5 15 %With respect to error comparator threshold
Output Undervoltage Threshold 60 70 80 %With respect to error comparator threshold
Current-Limit Threshold (positive
direction, fixed)
75 100 125 mVPGND - LX_, I
LIM
= V
CC
Current-Limit Threshold (positive
direction, adjusted)
32 50 62
mV
PGND - LX_, I
LIM
resistor = 100kΩ
PGND - LX_, I
LIM
resistor = 400kΩ 160 200 240
Thermal Shutdown Threshold 150 °CHysteresis = 10°C
Rising edge, hysteresis = 20mV, PWM disabled below
this level
4.1 4.4 V
V
CC
Undervoltage Lockout
Threshold
Logic Input High Voltage 2.4 V
ON_, SKIP
ON_, SKIP
0.8 VLogic Input Low Voltage
SKIP, to deactivate OVP circuitry
-5 -1 mALogic Input Current
