MAX1549ETL Datasheet, PDF (5/35 Pages) Maxim Integrated Products – Dual, Interleaved, Fixed-Frequency Step-Down Controller with a Dynamically Adjustable Output

Dual, Interleaved, Fixed-Frequency Step-Down
Controller with a Dynamically Adjustable Output
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V_CC = V_DD = 5V, SKIP = GND, T_A = 0°C to +85°C, unless otherwise noted. Typical values are at T_A = +25°C.)
PARAMETER
Logic Input Current
Dual-Mode Threshold Voltage
Four-Level Input Logic Levels
Four-Level Logic Input Current
SYMBOL
CONDITIONS
ON_, SKIP, G0, G1
FB2
High
Low
High
FSEL, FBLANK
Open
REF
Low
FSEL, FBLANK forced to GND or V_CC
MIN TYP MAX UNITS
-1
+1
µA
1.9
2.0
2.1
V
0.05
0.1
0.15
V_CC -
0.4V
3.15
3.85
V
1.65
2.35
0.5
-3
+3
µA
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V_CC = V_DD = 5V, SKIP = GND, T_A = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS
MIN
INPUT SUPPLIES (Note 1)
Input Voltage Range
V_BIAS V_CC, V_DD
4.5
Quiescent Supply Current (V_CC)
I_CC
OUT1 and FB2 forced above their
regulation points
Quiescent Supply Current (V_DD)
Shutdown Supply Current (V_CC)
Shutdown Supply Current (V_DD)
PWM CONTROLLERS
I_DD
OUT1 and FB2 forced above their
regulation points
ON1 = ON2 = GND, SKIP = V_CC
ON1 = ON2 = GND
Main Output-Voltage Accuracy
(OUT1 Tracking)
V_REFIN -
V_OUT1
With respect to
50% duty cycle
REFIN, SKIP = V_CC
or GND
10% to 90% duty cycle
Secondary Preset Output-Voltage
Accuracy (OUT2 Fixed)
Secondary Feedback-Voltage
Accuracy (FB2 Adjustable)
Output Adjust Range
OUT2 Input Resistance
V_OUT2
V_FB2
R_OUT2
SKIP = V_CC, 50% ^{FB2 = GND}
duty cycle (Note 1) _{FB2 = VCC}
SKIP = V_CC
(Note 1)
50% duty cycle
10% to 90% duty cycle
OUT1 (tracks REFIN)
OUT2
FB2 = GND or adjustable
FB2 = V_CC
OUT_ Discharge-Mode
On-Resistance
R_DISCHARGE
-8
-10
2.470
1.775
0.490
0.485
0.5
0.5
120
85
OUT_ Synchronous-Rectifier
Discharge-Mode Turn-On Level
0.2
MAX UNITS
5.5
V
1.8
mA
5
µA
5
µA
5
µA
+8
mV
+10
2.530
V
1.825
0.510
V
0.515
2.0
V
2.7
460
kΩ
335
40
Ω
0.4
V
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