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PDF MAX15003 Data sheet ( Hoja de datos )
| Número de pieza | MAX15003 | |
| Descripción | Triple-Output Buck Controller | |
| Fabricantes | Maxim Integrated Products | |
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19-1048; Rev 0; 10/07
Triple-Output Buck Controller with
Tracking/Sequencing
General Description
The MAX15003 is a triple-output, pulse-width-modulat-
ed (PWM), step-down DC-DC controller with tracking
and sequencing capability. The device operates over
the input voltage range of 5.5V to 23V or 5V ±10%.
Each PWM controller provides an adjustable output
down to 0.6V and delivers up to 15A for each output
with excellent load and line regulation. The MAX15003
is optimized for high-performance, small-size power
management solutions.
The options of coincident tracking, ratiometric tracking,
and output sequencing allow the tailoring of the power-
up/power-down sequence depending on the system
requirements. Each of the MAX15003 PWM sections uti-
lizes a voltage-mode control scheme with external com-
pensation allowing for good noise immunity and
maximum flexibility with a wide selection of inductor val-
ues and capacitor types. Each PWM section operates
at the same, fixed switching frequency that is program-
mable from 200kHz to 2.2MHz and can be synchro-
nized to an external clock signal using the SYNC input.
Each converter operating at up to 2.2MHz with 120°
out-of-phase, increases the input capacitor ripple fre-
quency up to 6.6MHz, thereby reducing the RMS input
ripple current and the size of the input bypass capaci-
tor requirement significantly.
The MAX15003 includes internal input undervoltage
lockout with hysteresis, digital soft-start/soft-stop for
glitch-free power-up and power-down of each convert-
er. The power-on reset (RESET) with an adjustable
www.DataitmaRSehEoeSueEtt4TpUe.scroiigomndalmtoontihtoersparollctehsrseoer
outputs and provides
when all outputs are
within regulation. Protection features include lossless
valley-mode current limit and hiccup mode output
short-circuit protection.
The MAX15003 is available in a space-saving, 7mm x
7mm, 48-pin TQFN-EP package and is specified for
operation over the -40°C to +125°C automotive temper-
ature range. See the MAX15002 data sheet for a dual
version of the MAX15003.
Applications
PCI Express® Host Bus Adapter Power Supplies
Networking/Server Power Supplies
Point-of-Load DC-DC Converters
Features
o 5.5V to 23V or 5V ±10% Input Voltage Range
o Triple-Output Synchronous Buck Controller
o Selectable In-Phase or 120° Out-of-Phase
Operation
o Output Voltages Adjustable from 0.6V to 0.85VIN
o Lossless Valley-Mode Current Sensing or
Accurate Valley Current Sensing Using RSENSE
o External Compensation for Maximum Flexibility
o Digital Soft-Start and Soft-Stop
o Sequencing or Coincident/Ratiometric VOUT
Tracking
o Individual PGOOD Outputs
o RESET Output with a Programmable Timeout
Period
o 200kHz to 2.2MHz Programmable Switching
Frequency
o External Frequency Synchronization
o Hiccup Mode Short-Circuit Protection
o Space-Saving (7mm x 7mm) 48-Pin TQFN
Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX15003ATM+
-40°C to +125°C
48 TQFN-EP*
(7mm x 7mm)
T4877-3
+Denotes a lead-free package.
*EP = Exposed pad.
Add a “T” after “+” for tape and reel. Tape-and-reel orders are
available in 2.5k increments.
Pin Configuration appears at end of data sheet.
PCI Express is a registered trademark of PCI-SIG Corp.
________________________________________________________________ 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  
Triple-Output Buck Controller with
Tracking/Sequencing
Typical Operating Characteristics
(Figure 8, VIN = 12V, CREG = 2.2µF, TA = +25°C, unless otherwise noted.)
CONVERTER 1 EFFICIENCY
vs. LOAD CURRENT
100
VIN = 6V
90
80 VIN = 12V
VIN = 16V
70
60
50
40
0.1
VOUT1 = 3.3V
fSW = 600kHz
1
LOAD CURRENT (A)
10
CONVERTER 2 EFFICIENCY
vs. LOAD CURRENT
100
90 VIN = 6V
80
70 VIN = 12V
60
50 VIN = 16V
40
30
20
10
0
0.1
VOUT2 = 2.5V
fSW = 600kHz
1
LOAD CURRENT (A)
10
100
90
80
70
60
50
40
30
20
10
0
0.1
CONVERTER 3 EFFICIENCY
vs. LOAD CURRENT
VIN = 6V
VIN = 16V
VIN = 12V
VOUT3 = 1.2V
fSW = 600kHz
1
LOAD CURRENT (mA)
10
CONVERTER 1 LOAD REGULATION
1.00
0.75
0.50
0.25
0
-0.25
-0.50
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-0.75
-1.00
0
500
VOUT1 = 3.3V
1000 1500 2000 2500 3000
LOAD CURRENT (mA)
CONVERTER 2 LOAD REGULATION
1.00
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
0
VOUT2 = 2.5V
1000 2000 3000 4000 5000 6000
LOAD CURRENT (mA)
CONVERTER 3 LOAD REGULATION
1.00
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
0
VOUT3 = 1.2V
2000 4000 6000 8000 10,000
LOAD CURRENT (mA)
INTERNAL VOLTAGE REGULATION (REG)
5.00
4.99
4.98
4.97
4.96
4.95
4.94
4.93
4.92
4.91
4.90
0
VIN = 12V
CREG = 2.2µF
20 40 60 80 100
IREG (mA)
CONVERTER_ SWITCHING FREQUENCY
vs. RRT
10,000
1000
100
0
0 100 200 300 400 500 600
RRT (kΩ)
_______________________________________________________________________________________ 5
5 Page 
Triple-Output Buck Controller with
Tracking/Sequencing
Pin Description (continued)
PIN NAME
FUNCTION
16
FB1
Controller 1 Feedback Regulation Point. Connect to the center tap of a resistive divider from the converter
output to SGND to set the output voltage. The FB1 voltage regulates to VFB (0.6V).
17 PGOOD1 Controller 1 Power-Good Output. Open-drain PGOOD1 output goes high impedance (releases) when FB1 is
above 0.925 x VFB = 0.555V.
Controller 2 Power Ground Connection. Connect the input filter capacitor’s negative terminal, the source of
18 PGND2 the synchronous MOSFET, and the output filter capacitor’s return to PGND2. Connect externally to SGND at
a single point near the input capacitor return terminal.
19 DL2 Controller 2 Low-Side Gate Driver Output. DL2 is the gate driver output for the synchronous MOSFET.
20
DREG2
Controller 2 Low-Side Gate Driver Supply. Connect externally to REG and the anode of the boost diode.
Connect at minimum, a 0.1µF ceramic capacitor from DREG2 to PGND2.
21 LX2 Controller 2 High-Side MOSFET Source Connection/Synchronous MOSFET Drain Connection. Connect the
inductor and the negative side of the boost capacitor to LX2.
22
DH2
Controller 2 High-Side Gate Driver Output. DH2 drives the gate of the high-side MOSFET.
23
BST2
Controller 2 High-Side Gate Driver Supply. Connect BST2 to the cathode of the boost diode and to the
positive terminal of the boost capacitor.
Controller 2 Negative Current-Sense Input. Connect CSN2 to the synchronous MOSFET drain (connected to
24
CSN2
LX2). When using a current-sense resistor, connect CSN2 to the junction of the low-side MOSFET’s source
and the current-sense resistor. See Figure 11.
Controller 2 Positive Current-Sense Input. Connect CSP2 to the synchronous MOSFET source (connected to
25
CSP2
PGND2). When using a current-sense resistor, connect CSP2 to the PGND2 end of the current-sense
resistor.
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Controller 2 Valley Current-Limit Set Output. Connect a 25kΩ to 150kΩ resistor, RILIM2, from ILIM2 to SGND
to program the valley current-limit threshold from 50mV to 300mV. ILIM2 sources 20µA out to RILIM2. The
resulting voltage divided by 10 is the valley current-limit threshold. When using a precision current-sense
resistor, connect a resistive divider from REG to ILIM2 to SGND to set the valley current limit. See Figure 11.
27
COMP2
Controller 2 Error Transconductance Amplifier Output. Connect COMP2 to the compensation feedback
network.
Controller 2 Enable/Tracking Input. See Figure 2.
When sequencing, EN/TRACK2 must be above 1.24V for the PWM controller 2 to start.
28 EN/TRACK2 Coincident tracking—connect the same resistive divider used for FB2, from Output 1 to EN/TRACK2 to
SGND.
Ratiometric tracking—connect EN/TRACK2 to analog ground.
29 FB2 Controller 2 Feedback Regulation Point. Connect to the center tap of a resistive divider from the converter
output to SGND to set the output voltage. The FB2 voltage regulates to VFB (0.6V).
30 PGOOD2 Controller 2 Power-Good Output. Open-drain PGOOD2 output goes high impedance (releases) when FB2 is
above 0.925 x VFB = 0.555V.
31 PGOOD3 Controller 3 Power-Good Output. Open-drain PGOOD3 output goes high impedance (releases) when FB3 is
above 0.925 x VFB = 0.555V.
32 FB3 Controller 3 Feedback Regulation Point. Connect to the center tap of a resistive divider from the converter
output to SGND to set the output voltage. The FB3 voltage regulates to VFB (0.6V).
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX15003.PDF ] | |
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