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PDF MAX15023 Data sheet ( Hoja de datos )

Número de pieza MAX15023
Descripción Dual-Output Synchronous Buck Controller
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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No Preview Available ! MAX15023 Hoja de datos, Descripción, Manual

19-4219; Rev 0; 7/08
EVAALVUAAILTAIOBNLEKIT
Wide 4.5V to 28V Input, Dual-Output
Synchronous Buck Controller
www.datasheet4u.com
General Description
The MAX15023 dual, synchronous step-down controller
operates from a 5.5V to 28V or 5V ±10% input voltage
range and generates two independent output voltages.
Each output is adjustable from 85% of the input voltage
down to 0.6V and supports loads of 12A or higher. Input
voltage ripple and total RMS input ripple current are
reduced by interleaved 180° out-of-phase operation.
The MAX15023 offers the ability to adjust the switching
frequency from 200kHz to 1MHz with an external resistor.
The MAX15023’s adaptive synchronous rectification elimi-
nates the need for external freewheeling Schottky diodes.
The device also utilizes the external low-side MOSFET’s
on-resistance as a current-sense element, eliminating the
need for a current-sense resistor. This protects the DC-
DC components from damage during output overloaded
conditions or output short-circuit faults without requiring a
current-sense resistor. Hiccup-mode current limit reduces
power dissipation during short-circuit conditions. The
MAX15023 includes two independent power-good out-
puts and two independent enable inputs with precise
turn-on/turn-off thresholds, which can be used for supply
monitoring and for power sequencing.
Additional protection features include cycle-by-cycle,
low-side, sink peak current limit, and thermal shutdown.
Cycle-by-cycle, low-side, sink peak current limit prevents
reverse inductor current from reaching dangerous levels
when the device is sinking current from the output. The
MAX15023 also allows prebiased startup without dis-
charging the output and features adaptive internal digital
soft-start. This new proprietary feature enables monoton-
ic charging of externally large output capacitors at start-
up, and achieves good control of the peak inductor
current during hiccup-mode short-circuit protection.
The MAX15023 is available in a space-saving and ther-
mally enhanced 4mm x 4mm, 24-pin TQFN-EP pack-
age. The device operates over the -40°C to +85°C
extended temperature range.
Applications
Point-of-Load Regulators
Set-Top Boxes
LCD TV Secondary Supplies
Switches/Routers
Power Modules
DSP Power Supplies
Features
o 5.5V to 28V or 5V ±10% Input Supply Range
o 0.6V to (0.85 x VIN) Adjustable Outputs
o Adjustable 200kHz to 1MHz Switching Frequency
o Guaranteed Monotonic Startup into a Prebiased
Load
o Lossless, Cycle-by-Cycle, Low-Side, Source Peak
Current Limit with Adjustable, Temperature-
Compensated Threshold
o Cycle-by-Cycle, Low-Side, Sink Peak Current-
Limit Protection
o Proprietary Adaptive Internal Digital Soft-Start
o ±1% Accurate Voltage Reference
o Internal Boost Diodes
o Adaptive Synchronous Rectification Eliminates
External Freewheeling Schottky Diodes
o Hiccup-Mode Short-Circuit Protection and
Thermal Shutdown
o Power-Good Outputs and Analog Enable Inputs
for Power Sequencing
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX15023ETG+
-40°C to +85°C
24 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration
TOP VIEW
18 17 16 15 14 13
RT 19
12 LX2
SGND 20
11 BST2
IN 21
LIM2 22
MAX15023
10 DH2
9 DH1
LIM1 23
COMP1 24
+
*EP 8 BST1
7 LX1
12 3 4 56
TQFN
*EXPOSED PAD (CONNECT TO GROUND).
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

1 page




MAX15023 pdf
Wide 4.5V to 28V Input, Dual-Output
Synchronous Buck Controller
www.datasheet4u.com
Typical Operating Characteristics
(Supply = IN = 12V, unless otherwise noted. See Typical Application Circuit of Figure 6.)
95
90
85
80
75
70
65
60
55
50
45
40
35
30
0.1
EFFICIENCY
vs. LOAD CURRENT
VOUT1 = 3.3V
VOUT1 = 1.2V
VIN = 12V
1 10
LOAD CURRENT (A)
100
VCC VOLTAGE
vs. LOAD CURRENT
5.40
5.35
5.30
5.25
5.20
5.15
5.10
5.05
5.00
0 15 30 45 60 75 90 105 120 135 150
LOAD CURRENT (mA)
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
10
SWITCHING FREQUENCY
vs. RT
20 30 40 50 60 70 80
RT (kΩ)
90
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
0.1
EFFICIENCY
vs. LOAD CURRENT
VOUT1 = 3.3V
VOUT1 = 1.2V
VIN = VCC = 5V
1 10
LOAD CURRENT (A)
100
5.50
5.35
5.20
5.05
4.90
4.75
4.60
4.45
4.30
4.15
4.00
4
VCC VOLTAGE
vs. IN VOLTAGE
ILOAD = 5mA
ILOAD = 50mA
8 12 16 20 24
IN VOLTAGE (V)
SWITCHING FREQUENCY
vs. TEMPERATURE
800
750 RT = 22.1kΩ
700
650
600
550 RT = 33.2kΩ
500
450
400
350
300 RT = 66.5kΩ
250
200
-40 -15 10 35 60
TEMPERATURE (°C)
28
85
101.0
100.8
100.6
100.4
100.2
100.0
99.8
99.6
99.4
99.2
99.0
0
OUTPUT VOLTAGE CHANGE
vs. LOAD CURRENT
OUT1
2 4 6 8 10 12
LOAD CURRENT (A)
VCC VOLTAGE
vs. TEMPERATURE
5.50
ILOAD = 5mA
5.45
5.40
5.35
5.30
5.25
5.20
5.15
5.10
5.05
5.00
-40
-15 10 35 30
TEMPERATURE (°C)
85
IIN CURRENT
vs. SWITCHING FREQUENCY
210
VIN = 12V
180
150 CDL = CDH = 10nF
120
CDL = CDH = 4.7nF
90
60
CDL = CDH = 1nF
30 CDL = CDH = 0nF
0
200 300 400 500 600 700 800 900 1000
SWITCHING FREQUENCY (kHz)
_______________________________________________________________________________________ 5

5 Page





MAX15023 arduino
www.datasheet4u.com
Wide 4.5V to 28V Input, Dual-Output
Synchronous Buck Controller
Functional Diagram
______________________________________________________________________________________ 11

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