MAX15022_11 Datasheet, PDF (8/28 Pages) Maxim Integrated Products – Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Dual LDO Controllers

Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Dual LDO Controllers
Typical Operating Characteristics (continued)
(V_AVIN = V_DVDD1 = V_DVDD2 = V_PVIN1 = V_PVIN2 = 5V, V_OUT1 = 3.3V, V_OUT2 = 1.5V, V_{PGND_} = 0V, R_T = 16.5kΩ. T_A = +25°C, unless
otherwise noted.)
2.500
2.495
2.490
2.485
2.480
2.475
2.470
2.465
2.460
2.455
2.450
2.90
CHANNEL 3 OUTPUT VOLTAGE
vs. INPUT VOLTAGE
I_OUT3 = 10mA
I_OUT3 = 500mA
V_OUT3 = 2.5V
3.42 3.94 4.46 4.98 5.50
SUPPLY VOLTAGE (V)
CHANNEL 4 OUTPUT VOLTAGE
vs. INPUT VOLTAGE
1.215
1.210
1.205
I_OUT4 = 500mA
1.200
1.195
1.190
1.185
1.180
I_OUT4 = 10mA
1.175
1.170
2.90
V_OUT4 = 1.5V
3.42 3.94 4.46 4.98 5.50
SUPPLY VOLTAGE (V)
LDO POWER-SUPPLY REJECTION RATIO
0
V_IN = 3.3V, V_OUT3 = 2.5V,
-10
I_OUT3 = 10mA,
100mV_P-P SIGNAL
-20
APPLIED TO VIN
-30
-40
-50
-60
-70
-80
10
100
1000
FREQUENCY (Hz)
PIN
1
2, 7, 8
3, 6
4, 5
9
10
11
12
Pin Description
NAME
SEL
PGND1
LX1
PVIN1
DVDD1
EN1
FB1
COMP1
FUNCTION
Track/Sequence Select Input. Connect SEL to SGND to configure the device as a sequencer. Connect
SEL to AVIN for tracking with output 1 as the master. Leave SEL unconnected for tracking with output 2
as the master. Use the output with the higher voltage as the master and the output with the lower voltage
as the slave.
Power Ground Connection for Regulator 1. Connect the negative terminals of the input and output filter
capacitors to PGND1. Connect PGND1 externally to SGND at a single point, typically at the negative
terminal of the input bypass capacitor.
Inductor Connection for Regulator 1. LX1 is the drain connection of the internal high-side p-channel
MOSFET and the drain connection of the internal synchronous n-channel MOSFET for regulator 1.
Input Supply Voltage for Regulator 1. Connect PVIN1 to an external voltage source from 2.5V to 5.5V.
Bypass PVIN1 to PGND1 with a 1µF (min) ceramic capacitor.
Switch Driver Supply for Regulator 1. Connect externally to PVIN1.
Enable Input for Regulator 1. When configured as a sequencer, EN1 must exceed 1.225V (typ) for the
PWM controller to begin regulating output 1. When configured as a tracker, connect EN1 to the center
tap of a resistive divider from the regulator 2 output.
Feedback Regulation Point for Regulator 1. Connect FB1 to the center tap of a resistive divider from the
regulator 1 output to SGND to set the output voltage. The FB1 voltage regulates to 0.6V (typ).
Error-Amplifier Output for Regulator 1. Connect COMP1 to the compensation feedback network.
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