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PDF MAX8513 Data sheet ( Hoja de datos )
| Número de pieza | MAX8513 | |
| Descripción | Triple-Output Supplies | |
| Fabricantes | Maxim Integrated Products | |
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Hay una vista previa y un enlace de descarga de MAX8513 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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19-3178; Rev 0; 2/04
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
General Description
The MAX8513/MAX8514 integrate a voltage-mode
PWM step-down DC-DC controller and two LDO con-
trollers, a voltage monitor, and a power-on reset for the
lowest-cost power-supply and monitoring solution for
xDSL modems, routers, gateways, and set-top boxes.
The DC-DC controller switching frequency can be set
with an external resistor from 300kHz to 1.4MHz, to allow
for the optimization of cost, size, and efficiency. For noise-
sensitive applications, the DC-DC controller can also be
synchronized to an external clock, minimizing noise inter-
ference. Operation above 1.1MHz reduces noise for high
data-rate xDSL applications. An adjustable soft-start and
adjustable foldback current limit provide reliable startup
and fault protection. The DC-DC controller output voltage
can be set externally to a voltage from 1.25V to 5.5V.
Current limiting is accomplished by inductor current sens-
ing for improved efficiency, or by an external sense resis-
tor for better accuracy.
The MAX8513/MAX8514s’ first LDO controller is
designed to provide a low-cost, high-current regulated
output from 0.8V to 5.5V using an N-channel MOSFET or
a low-current output using a low-cost NPN transistor. The
MAX8513’s second regulator can be used to generate
0.8V to 27V output with a low-cost PNP transistor. Both
LDO regulators can operate either from the DC-DC con-
troller output or from a higher voltage derived with a fly-
back overwinding on the DC-DC converter inductor. The
MAX8514’s second LDO regulator is designed to pro-
vide a negative output with an NPN transistor.
A sequence input allows the outputs to either power up
together, or for the DC-DC regulator to power up first
and each LDO controller to power up in sequence. An
input power-fail output (PFO) is provided for input
power-fail warning, such as in dying-gasp applications.
A power-on reset circuit with a 140ms delay is also
included to indicate when all outputs have achieved
regulation and stabilized.
Applications
xDSL, Cable, ISDN Modems, and Routers
Wireless Routers
Set-Top Boxes
Automotive Dashboard Electronics
Pin Configurations appear at end of data sheet.
Features
♦ Low-Cost DC-DC Controller with Two LDOs
♦ Wide Input Range: 4.5V to 28V
♦ 300kHz to 1.4MHz Adjustable Switching
Frequency
♦ Low Noise for High Data-Rate xDSL Applications
♦ Synchronizable to External Clock
♦ Adjustable Soft-Start
♦ Lossless Adjustable Foldback Current Limit
♦ Power-On Reset with 140ms Delay
♦ Adjustable Input Power-Fail Warning for Dying
Gasp
♦ Selectable Output-Voltage Sequencing or
Output-Voltage Tracking
PART
MAX8513EEI
MAX8514EEI
MAX8514AEI
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
PIN-PACKAGE
28 QSOP
28 QSOP
28 QSOP
VIN
(4.5V TO 28V)
ON
OFF
SYNC
Functional Diagram
MAX8513
STEP-
DOWN
CONTROLLER
VOUT1
(1.25V TO 5.5V)
OUTPUT
POWER-ON RESET
LDO
CONTROLLER 1
INPUT POWER-
FAIL MONITOR
LDO
CONTROLLER 2
VOUT2
(0.8V TO VOUT1)
VOUT3
(0.8V TO 27V)
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VLX = VSUP2 = 12V, VPVL = VBST - VLX = VDRV3P = 5V, VSUP3N = 3.3V, VDRV3N = -5V, CVL = 4.7µF, CREF = 0.22µF, RFREQ =
15.0kΩ, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SEQ, PFI, PFO, POR
SEQ Input-Voltage High
2.4 V
SEQ Input-Voltage Low
0.8 V
SEQ Input Current
POR Output-Voltage Low
VSEQ = 0 to VVL
VFB1, VFB2, VFB3P,
VFB3N, out-of-regulation
IPOR = 1.6mA
IPOR = 0.1mA,
VIN = 1.0V
1 10 µA
10 200
mV
20 200
POR Output Leakage Current
VFB1, VFB2, and VFB3P or VFB3N, in-
regulation
0.001
1
µA
POR Power-Ready Delay Time
From VFB1, VFB2, and VFB3P or VFB3N, in-
regulation to POR = high impedance
140
315
560
ms
PFI Input Threshold
PFI Input Bias Current
PFO Output-Voltage Low
PFO Output Leakage Current
THERMAL PROTECTION
Thermal Shutdown
Thermal-Shutdown Hysteresis
Falling, VHYST = 20mV
VPFI = 1.0V
PFI = 1.1V
PFI = 1.4V, PFO = 5V
IPFO = 1.6mA
IPFO = 0.1mA,
VIN = 1.0V
1.20
1.22
0.1
20
10
0.001
1.25
100
200
200
1
Junction temperature rising
+170
25
V
nA
mV
µA
°C
°C
ELECTRICAL CHARACTERISTICS
(VIN = VLX = VSUP2 = 12V, VPVL = VBST - VLX = VDRV3P = 5V, VSUP3N = 3.3V, VDRV3N = -5V, CVL = 4.7µF, CREF = 0.22µF, RFREQ =
15.0kΩ, TA = -40°C to +125°C (Note 2), unless otherwise noted.)
PARAMETER
GENERAL
IN Operating Range
SYMBOL
CONDITIONS
IN = VL
MIN MAX UNITS
5.5 28.0
V
4.5 5.5
IN Supply Current
VFB1 = 1.3V, VFB2 = VFB3 = 1.0V, does not
include switching current to PVL and BST,
SYNC/EN = VL
3.2 mA
IN Shutdown Current
VL REGULATOR
VL Output Voltage
VL Dropout Voltage
VL Undervoltage Threshold
VSYNC/EN = 0, RFREQ = 50kΩ
VIN = 6V to 28V, IVL = 0.1mA to 40mA
From IN to VL, VIN = 5V, IVL = 40mA
VL rising, VHYST = 675mV (typ)
4.75
3.6
300
5.25
610
4.2
µA
V
mV
V
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
Typical Operating Characteristics (continued)
(Circuit of MAX8513 evaluation kit, VIN = 12V, TA = +25°C, fS = 1.4MHz, unless otherwise noted.)
STAGGERED SEQUENCE (SEQ = GND)
MAX8513/14 toc16
SYNC/EN
0V 5V/div
VOUT3
5V/div
VOUT1
2V/div
VOUT2
2V/div
0V
2ms/div
TRACKING SEQUENCE (SEQ = VL)
MAX8513/14 toc17
SYNC/EN
0V 5V/div
VOUT3
5V/div
VOUT1
2V/div
VOUT2
2V/div
0V
4ms/div
OUTPUT1 SHORT CIRCUIT
(ALL OUTPUTS AT FULL LOAD)
MAX8513/14 toc18
VOUT1
2V/div
0V
VLX
10V/div
0V
OUTPUT1 SHORT CIRCUIT
(ALL OUTPUTS AT NO LOAD)
MAX8513/14 toc19
VOUT1
2V/div
0V
VLX
10V/div
0V
1L
2A/div
IL
2A/div
0A 0A
20µs/div
20µs/div
OUTPUT RIPPLE AND HARMONICS
(MEASURED AT OUT1)
1.5
1.3
VIN = 12V
VOUT1 = 3.3V AT 2A
1.1 VOUT2 = 2.5V AT 1.5A
0.9 VOUT3 = 12V AT 50mA
0.7
0.5
0.3
0.1
-0.1
-0.3
-0.5
100
1100 2100 3100 4100 5100
FREQUENCY (kHz)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX8513.PDF ] | |
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