MAX1536 Datasheet, PDF (2/19 Pages) Maxim Integrated Products – 3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-Down Regulator with Dynamic Output Voltage Control

3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-
Down Regulator with Dynamic Output Voltage Control
ABSOLUTE MAXIMUM RATINGS
V_CC, IN, SHDN, SKIP to AGND ................................-0.3V to +6V
OD, OD, GATE, PGOOD to AGND...........................-0.3V to +6V
COMP, FB, REF to AGND.........................................-0.3V to +6V
TOFF, REFIN, FBLANK to AGND .............................-0.3V to +6V
IN to V_CC ...............................................................-0.3V to +0.3V
PGND to AGND .................................................... -0.3V to +0.3V
LX to PGND ................................................ -0.3V to (V_IN + 0.3V)
LX Current (Note 1).............................................................±5.7A
REF Short Circuit to AGND.........................................Continuous
Continuous Power Dissipation (T_A = +70°C)
28-Pin Thin QFN (derated 20.8mW/°C above +70°C;
part mounted on 1in² of 1oz copper) .........................1667mW
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
Note 1: LX has clamp diodes to PGND and IN. Thermal limits dictate the maximum continuous current through these diodes.
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_IN = V_CC = V_SHDN = +3.3V, V_REFIN = +1.5V, SKIP = AGND, T_A = 0°C to +85°C, unless otherwise noted. Typical
values are at T_A = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
PWM CONTROLLER
Input Voltage
Output Adjust Range
Feedback Voltage Accuracy
V_IN, V_CC
V_OUT
V_FB -
V_REFIN
V_CC = V_IN = +3.0V to
+5.5V, I_LOAD = 0
3.0
V_REFIN
T_A = +25°C to +85°C -3
0
T_A = 0°C to +85°C
-4
0
5.5
V
V_IN
V
+3
mV
+4
Feedback Load Regulation
I_LOAD = 0 to 3.5A, V_CC = V_IN = +3.0V to +5.5V,
SKIP = V_CC
0.3
%
FB Input Bias Current
Dropout
PMOS Switch On-Resistance
NMOS Switch On-Resistance
Maximum Output Current
Current-Limit Threshold
Idle Mode Current Threshold
Zero-Cross Current Threshold
I_FB
V_FB = 1.01 × V_REFIN
V_DO V_CC = V_IN = +3.0V, I_LOAD = 3A, FB = AGND
R_PMOS
V_CC = V_IN = +4.5V, I_LOAD = 0.5A
V_CC = V_IN = +3.0V, I_LOAD = 0.5A
R_NMOS ^{VCC = VIN = +4.5V, ILOAD = 0.5A}
V_CC = V_IN = +3.0V, I_LOAD = 0.5A
I_OUT(RMS) (Note 2)
I_LIMIT (Note 3)
SKIP = AGND
SKIP = AGND
-50
+50
nA
189 330 mV
54
90
mΩ
63
110
47
80
mΩ
53
90
3.6
A
4.0
4.8
5.5
A
0.21 0.60 1.00
A
200
mA
Switching Frequency
Off-Time
Extended Off-Time
On-Time
Soft-Start Time
Quiescent Supply Current
f_SW
t_OFF
t_ON
I_CC + I_IN
(Note 2)
R_TOFF = 30.1kΩ
V_FB ≥ 0.3 × V_REFIN
R_TOFF = 110kΩ
V_FB < 0.3 × V_REFIN
R_TOFF = 499kΩ
(Note 2)
(Note 3)
SKIP = AGND, V_FB = 1.01 × V_REFIN
1.4
0.24 0.30 0.37
0.85 1.00 1.15
3.8
4.5
5.2
4 × t_OFF
0.3
3 × 256
350 750
MHz
µs
µs
µs
Cycles
µA
2 _______________________________________________________________________________________