Rainbow Electronics MAX17008 - Manual (Page 6)

MAX17007A/MAX17008
Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 12V, V DD = V CC = V EN1 = V EN2 = 5V, V REFIN1 = 2V, SKIP = GND, T A = -40°C to +105°C, unless otherwise noted.) (Note 4)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
REFIN1 Dual-Mode
Switchover Threshold
3.75
V
CC
-
0.4
V
SMPS1 Voltage Accuracy V CSL1
Measured at CSL1, REFIN1 = V CC;
V IN = 2V to 26V, SKIP = V
CC (Note 2)
1.039 1.061 V
SMPS2 Voltage Accuracy V CSL2
Measured at CSL2, FB2 = REF;
V
IN = 2V to 26V, SKIP = V
CC (Note 2)
1.485 1.515 V
INTERNAL REFERENCE
Reference Voltage V REF V DD = 4.5V to 5.5V 1.985 2.015 V
FAULT DETECTION
SMPS1 Overvoltage Trip
Threshold and PGOOD1
Upper Threshold
(MAX17007A Only)
V OVP1 ,
V PG1_H
With respect to the internal target voltage
(error comparator threshold); rising edge;
hysteresis = 50mV
260 340 mV
SMPS2 Overvoltage Trip
Threshold and PGOOD2
Upper Threshold
(MAX17007A Only)
V OVP2 ,
V PG2_H
With respect to the internal target voltage
0.7V (error comparator threshold);
hysteresis = 50mV
120 180 mV
SMPS1 Undervoltage Protection
Trip Threshold and Lower
PGOOD1 Threshold
V UVP1 ,
V PG1_L
With respect to the internal target voltage
(error comparator threshold) falling edge;
hysteresis = 50mV
-240 -160 mV
SMPS2 Undervoltage Protection
Trip Threshold and Lower
PGOOD2 Threshold
V
UVP2
,
V PG2_L
With respect to the internal target voltage
0.7V (error comparator threshold)
falling edge; hysteresis = 50mV
-130 -70 mV
Output Undervoltage Fault
Propagation Delay
t
UVP
REFIN1/FB2 forced 25mV below trip
threshold
90 360 μs
PGOOD_ Propagation Delay t PGOOD Startup delay from regulation 90 360 μs
PGOOD_ Output Low Voltage I SINK = 3mA 0.4 V
V CC Undervoltage Lockout
Threshold
V UVLO(VCC)
Rising edge, PWM disabled below this level;
hysteresis = 100mV
3.8 4.45 V
CURRENT LIMIT
CSH1, CSH2 0 2.3
Current-Sense Input Range
CSL1, CSL2 0 2.3
V
Current-Limit Threshold (Fixed) V CSLIMIT V CSH_ - V CSL_ , ILIM1 = ILIM2 = REF 27 33 mV
Ultrasonic Frequency
SKIP = OPEN (3.3V);
V
CSL1 = V REFIN1 + 50mV;
V CSL2 = V FB2 + 50mV
18 kHz
V CSL1 = V REF1 + 50mV 22 46 Ultrasonic Current-Limit
Threshold
SKIP = OPEN (3.3V)
V CSL2 = V FB2 + 50mV 18 46
mV
Current-Balance Amplifier (GMI)
Offset
[V(CSH1,CSL1) - V(CSH2,CSL2)] at I CCI = 0 -3 +3 mV