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PDF MAX15034 Data sheet ( Hoja de datos )
| Número de pieza | MAX15034 | |
| Descripción | Single-/Dual-Output Synchronous Buck Controller | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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www.DataSheet.co.kr
19-4218; Rev 0; 7/08
EVAALVUAAILTAIOBNLEKIT
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
General Description
The MAX15034 two-phase, configurable single- or dual-
output buck controller has an input voltage range of
4.75V to 5.5V or 5V to 28V. A mode select input allows
for a dual-output supply or connecting two phases
together for a single-output, high-current supply. Each
output channel of the MAX15034 drives n-channel
MOSFETs and is capable of providing more than 25A of
load current. The MAX15034 uses average current-
mode control with a switching frequency up to 1MHz
per phase where each phase is 180° out of phase with
respect to the other. Out-of-phase operation results in
significantly reduced input capacitor ripple current and
output voltage ripple in dual-phase, single-output volt-
age applications. Each controller has its own high-per-
formance current and voltage-error amplifier that can
be compensated for optimum output filter L-C values
and transient response.
The MAX15034 offers two enable inputs with accurate
turn-on thresholds to allow for output voltage sequencing
of the two outputs. The device’s switching frequency can
be programmed from 100kHz to 1MHz with an external
resistor. The MAX15034 can be synchronized to an
external clock. Each output voltage is adjustable from
0.61V to 5.5V. Additional features include thermal shut-
down and hiccup-mode, short-circuit protection. Use the
MAX15034 with adaptive voltage positioning for applica-
tions that require a fast transient response or accurate
output voltage regulation.
The MAX15034 is available in a thermally enhanced 28-
pin TSSOP package capable of dissipating 2.1W. The
device is rated for operation over the -40°C to +125°C
automotive temperature range.
Features
o 4.75V to 5.5V or 5V to 28V Input
o Dual-Output Synchronous Buck Controller
o Configurable for Two Separate Outputs (25A) or
One Single Output (50A)
o Average Current-Mode Control with Accurate
Adjustable Current Limit
o 180° Interleaved Operation Reduces Size of Input
Filter Capacitors
o Limits Reverse Current Sinking When Operated in
Parallel Mode
o Each Output is Adjustable from 0.61V to 5.5V
o Independently Programmable Adaptive Voltage
Positioning
o Monotonic Startup into Prebiased Outputs
o Independent Shutdown for Each Output
o 100kHz to 1MHz per Phase Programmable
Switching Frequency
o Oscillator Frequency Synchronization from
200kHz to 2MHz
o Digital Soft-Start on Outputs
o Hiccup-Mode Overcurrent Protection
o Overtemperature Shutdown
o Thermally Enhanced 28-Pin TSSOP Package
Capable of Dissipating 2.1W
Applications
High-End Computers/Workstations/Servers
Graphics Cards
Networking Systems
Point-of-Load High-Current/High-Density
Telecom DC-DC Regulators
RAID Systems
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX15034AAUI+ -40°C to +125°C 28 TSSOP
MAX15034BAUI+ -40°C to +125°C 28 TSSOP-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
________________________________________________________________ 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.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
Typical Operating Characteristics
(Circuit of Figure 6, TA = +25°C, unless otherwise noted. VIN = 12V, VOUT1 = 0.8V, VOUT2 = 1.3V, fSW = 500kHz per phase.)
10,000
OSCILLATOR FREQUENCY vs. RT
CDH_ = CDL_ = 0
1000
100
10
0 100 200 300 400 500 600 700 800 900 1000
RT (kΩ)
SUPPLY CURRENT
vs. TEMPERATURE AND FREQUENCY
(VIN = 5V)
16
CDH_ = CDL_ = 0
fSW = 1MHz
14
12 fSW = 500kHz
10
8
6 fSW = 250kHz
fSW = 125kHz
4
2
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
SUPPLY CURRENT
vs. TEMPERATURE AND FREQUENCY
(VIN = 12V)
16
CDH_ = CDL_ = 0
fSW = 1MHz
14
12 fSW = 500kHz
10
8
6 fSW = 250kHz
fSW = 125kHz
4
2
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
SUPPLY CURRENT
vs. TEMPERATURE AND FREQUENCY
(VIN = 24V)
16
CDH_ = CDL_ = 0
fSW = 1MHz
14
12 fSW = 500kHz
10
8
6 fSW = 250kHz
fSW = 125kHz
4
2
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
SUPPLY CURRENT
vs. OSCILLATOR FREQUENCY
14
CDH_ = CDL_ = 0
13
12
11
10 VIN = 24V
VIN = 12V
9
8
VIN = 5V
7
6
200 400 600 800 1000 1200 1400 1600 1800 2000
FREQUENCY (kHz)
SUPPLY CURRENT
vs. DRIVER LOAD CAPACITANCE
100
CLOAD = CDH_ = CDL_
90
80
70
60
50
40
30
20
10
0
0 5 10 15 20 25 30
CLOAD (nF)
REG LOAD REGULATION
5.10
VIN = 24V
5.05
REG LINE REGULATION
5.10
5.08 IREG = 0
5.06
OUTPUT LOAD-TRANSIENT RESPONSE
MAX15034 toc07
20A IOUT
10A/div
5.00
VIN = 5.5V
4.95
VIN = 12V
5.04
5.02
5.00
4.98
IREG = 60mA
VOUT
100mV/div
AC-COUPLED
4.90
0
10 20 30 40 50 60 70 80 90 100
IREG (mA)
4.96
5 7 9 11 13 15 17 19 21 23
VIN (V)
2ms/div
_______________________________________________________________________________________ 5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
CLP1 10
EAOUT1 12
EAN1 11
IN 22
VREG = 5V
UVLO
REG 21
EN1 15
AVGLIMIT 6
FOR INTERNAL
BIASING
EN2 28
AGND 8
EAN2 4
EAOUT2 3
MODE 9
CLP2 5
VINTREF = 0.61V
VEA2
VEA1
CEA1
2VP-P
RAMP
1.225V
CEN1
THERMAL
SHUTDOWN
1.225V
CEN2
2VP-P
RAMP
MUX
CEA2
CA1
DF1 AND
HICCUP
LOGIC
CPWM1
CONTROL
AND DRIVER
LOGIC 1
0°
13 CSP1
14 CSN1
16 BST1
17 DH1
18 LX1
20 VDD
19 DL1
OSCILLATOR
AND PHASE
SPLITTER
EXTERNAL FREQUENCY SYNC
7 RT/CLKIN
180°
CONTROL
AND DRIVER
LOGIC 2
VDD
CPWM2
27 BST2
26 DH2
25 LX2
24 DL2
23 PGND
DF2 AND
HICCUP
LOGIC
2 CSP2
CA2
1 CSN2
Figure 1. Block Diagram
Two enable comparators (CEN1 and CEN2) are avail-
able to control and sequence the two PWM sections
through the enable (EN1 or EN2) inputs. An oscillator,
with an externally programmable frequency generates
two clock pulse trains and two ramps for both PWM
sections. The two clocks and the two ramps are 180°
out of phase with each other.
A linear regulator (REG) generates the 5V to supply the
device. This regulator has the output-current capability
necessary to provide for the MAX15034’s internal
circuitry and the power for the external MOSFET’s gate
drivers. Internal UVLO circuitry ensures that the
MAX15034 starts up when VREG is at the correct volt-
age levels to guarantee safe operation of the IC and of
the power MOSFETs.
Finally, a thermal-shutdown feature protects the device
during thermal faults and shuts down the MAX15034
when the die temperature exceeds +160°C.
______________________________________________________________________________________ 11
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MAX15034.PDF ] | |
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