MAX1549ETL Datasheet, PDF (2/35 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
ABSOLUTE MAXIMUM RATINGS
V_CC to GND ..............................................................-0.3V to +6V
V_DD to PGND............................................................-0.3V to +6V
CSH_, CSL_, OUT_, PGOOD_,
OD_ to GND ...........................................-0.3V to (V_CC + 0.3V)
G0, G1, ILIM_, REFIN to GND ..................................-0.3V to +6V
FB2, SKIP, ON_ to GND ...........................................-0.3V to +6V
REF, CC1, FBLANK, FSEL to GND.............-0.3V to (V_CC + 0.3V)
DL1, DL2 to PGND .....................................-0.3V to (V_DD + 0.3V)
BST1, BST2 to PGND .............................................-0.3V to +36V
LX1 to BST1..............................................................-6V to +0.3V
DH1 to LX1 ..............................................-0.3V to (V_BST1 + 0.3V)
LX2 to BST2..............................................................-6V to +0.3V
DH2 to LX2 ..............................................-0.3V to (V_BST2 + 0.3V)
GND to PGND .......................................................-0.3V to +0.3V
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T_A = +70°C)
40-Pin 6mm x 6mm Thin QFN (derated 26.3mW/°C
above +70°C).............................................................2105mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(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
INPUT SUPPLIES (Note 1)
Input Voltage Range
Quiescent Supply Current (V_CC)
SYMBOL
CONDITIONS
V_BIAS
I_CC
V_CC, V_DD
OUT1 and FB2 forced above their
regulation points
MIN TYP MAX UNITS
4.5
5.5
V
1.0
1.8
mA
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
1.5
5
µA
2.5
5
µA
<1
5
µA
Main Output-Voltage Accuracy
(OUT1 Tracking)
V_REFIN -
V_OUT1
With respect to
REFIN, SKIP =
V_CC or GND
50% duty cycle
10% to 90% duty cycle
-5
-10
0
+5
mV
+10
Secondary Preset Output-Voltage
Accuracy (OUT2 Fixed)
V_OUT2
SKIP = V_CC, 50% ^{FB2 = GND}
duty cycle (Note 1) _{FB2 = VCC}
2.475 2.5 2.525
V
1.780 1.8 1.820
Secondary Feedback-Voltage
Accuracy (FB2 Adjustable)
V_FB2
SKIP = V_CC
(Note 1)
50% duty cycle
0.490 0.50 0.510
V
10% to 90% duty cycle 0.485
0.515
Load-Regulation Error
I_LOAD = 0 to 3A, SKIP = V_CC
0.1
%
V_IN Line-Regulation Error
V_IN = 2V to 28V
1
%
Output Adjust Range
OUT1 (tracks REFIN)
OUT2
0.5
2.0
V
0.5
2.7
OUT1 Input Bias Current
I_OUT1 V_OUT1 = 0.5V to 2.0V
-1
+1
µA
FB2 Input Bias Current
I_FB2
V_FB2 = 0 to 2.7V
-0.1
+0.1
µA
OUT2 Input Resistance
R_OUT2
FB2 = GND or adjustable
FB2 = V_CC
120 250 460
kΩ
85
180 335
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