Rainbow Electronics MAX8514 User Manual
General Description
The MAX8513/MAX8514 integrate a voltage-mode
PWM step-down DC-DC controller and two LDO controllers, 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 noisesensitive applications, the DC-DC controller can also be
synchronized to an external clock, minimizing noise interference. 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 sensing for improved efficiency, or by an external sense resistor 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 controller output or from a higher voltage derived with a flyback overwinding on the DC-DC converter inductor. The
MAX8514’s second LDO regulator is designed to provide 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
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
MAX8513/MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
________________________________________________________________ Maxim Integrated Products 1
Functional Diagram
Ordering Information
19-3178; Rev 0; 2/04
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.
EVALUATION KIT
AVAILABLE
Pin Configurations appear at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX8513EEI -40°C to +85°C 28 QSOP
MAX8514EEI -40°C to +85°C 28 QSOP
MAX8514AEI -40°C to +125°C 28 QSOP
V
IN
(4.5V TO 28V)
ON
OFF
SYNC
MAX8513
STEPDOWN
CONTROLLER
V
OUT1
(1.25V TO 5.5V)
OUTPUT
POWER-ON RESET
LDO
CONTROLLER 1
INPUT POWER-
FAIL MONITOR
LDO
CONTROLLER 2
V
OUT2
(0.8V TO V
OUT1
V
OUT3
(0.8V TO 27V)
)
MAX8513/MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= VLX= V
SUP2
= 12V, V
PVL
= V
BST
- VLX= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, CVL= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN, DRV3P, SUP2 to GND.......................................-0.3V to +30V
DRV2 to GND ..........................................-0.3V to (V
SUP2
+ 0.3V)
DRV3N to GND......................(V
SUP3N
- 28V) to (V
SUP3N
+ 0.3V)
FREQ, PFI, PFO, POR, SUP3N, SYNC/EN,
CSP, CSN to GND ................................................-0.3V to +6V
VL to GND ...................-0.3V to the lesser of (V
IN
+ 0.3V) or +6V
COMP1, FB1, FB2, FB3P, FB3N, REF, ILIM,
SS, SEQ to GND......................................-0.3V to (V
VL
+ 0.3V)
PVL to PGND............................................................-0.3V to +6V
DL to PGND...............................................-0.3V to (V
PVL
+ 0.3V)
BST to LX..................................................................-0.3V to +6V
DH to LX....................................................-0.3V to (V
BST
+ 0.3V)
PGND to GND .......................................................-0.3V to +0.3V
VL Short Circuit to GND .............................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C).........860mW
Operating Temperature Range
MAX8513EEI, MAX8514EEI.............................-40°C to +85°C
MAX8514AEI..................................................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
GENERAL
IN Operating Range
IN Supply Current
IN Shutdown Current V
VL REGULATOR
VL Output Voltage VIN = 6V to 28V, IVL = 0.1mA to 40mA 4.75 5 5.25 V
VL Dropout Voltage From IN to VL, VIN = 5V, IVL = 40mA 560 mV
VL Line Regulation VIN = 6V to 28V, IVL = 5mA 0.05 %
VL Undervoltage Threshold VL rising, V
OUT1 (BUCK CONVERTER)
Output Voltage Range V
FB1 Regulation Threshold V
Error-Amplifier Open-Loop
Voltage Gain
FB1 Input Bias Current I
Error-Amplifier Gain Bandwidth 25 MHz
DH Output-Resistance High R
DH Output-Resistance Low R
DL Output-Resistance High R
DL Output-Resistance Low R
Driver Dead Time t
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUT1
FB1
A
VOL
FB1_BIAS
DH_HIGH
DH_LOW
DL_HIGH
DL_LOW
dt
IN = VL 4.5 5.5
= 1.3V, V
V
FB1
include switching current to PVL and BST,
SYNC/EN = VL
SYNC/EN
(Note 1) 1.25 5.50 V
V
FB1
Starts from VDL = 1V or (VDH - VLX) = 1V 50 ns
= 0, R
HYST
= 1.3V -200 +10 +200 nA
= V
FB2
FREQ
= 675mV (typ) 3.6 4.2 V
= 1.0V, does not
FB3
= 50kΩ 200 300 µA
5.5 28.0
2.6 3.2 mA
1.234 1.25 1.259 V
65 90 dB
1.5 2.55 Ω
1.2 2.1 Ω
2.5 5 Ω
0.7 1.3 Ω
V
MAX8513/MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VLX= V
SUP2
= 12V, V
PVL
= V
BST
- VLX= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, CVL= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Current-Limit Threshold (Positive) V
Current-Limit Threshold
(Negative)
CSP and CSN Bias Current V
ILIM Bias Current V
SS Soft-Start Charge Current VSS = 0.6V 15 25 35 µA
Soft-Start Discharge Resistance 100 200 Ω
LX, BST, PVL Leakage Current
FB1 Power-On Reset Threshold 1.08 1.125 1.20 V
OUT2 (POSITIVE LDO)
SUP2 Operating Range V
DRV2 Clamp Voltage V
SUP2 Supply Current 160 300 µA
SUP2 Shutdown Supply Current V
FB2 Regulation Voltage V
FB2 Input Bias Current I
DRV2 Output Current Limit VIN = 5V, V
DRV2 Output Current Limit
During Soft-Start
FB2 Power-On Reset Threshold 0.690 0.720 0.742 V
FB2 to DRV2 Transconductance G
OUT3P (POSITIVE PNP LDO) (MAX8513 ONLY)
DRV3P Operating Range V
FB3P Regulation Voltage V
FB3P to DRV3P Large-Signal
Transconductance
Feedback Input Bias Current V
Driver Sink Current V
FB3P POR Threshold 0.690 0.720 0.742 V
FB3P Soft-Start Period 1312
V
SUP2
DRV2
FB2
FB2_BIASVFB2
DRV3P
G
C3P
CS
CS
V
= 2.00V, V
ILIM
V
= 0.50V, V
ILIM
V
= VVL, V
ILIM
V
= 2.00V, V
ILIM
V
= 0.50V, V
ILIM
V
= VVL, V
ILIM
= V
CSP
ILIM
V
= VIN = 28V, V
LX
V
SYNC/EN
= 0 to 5.5V -120 +135 µA
CSN
= 1.25V -5.3 -5 -4.7 µA
= 0
= 0 to 5.5V 246 275 300
CSN
= 0 to 5.5V 50 67 81
CSN
= 0 to 5.5V 151 170 188
CSN
= 0 to 5.5V -333 -272 -199
CSN
= 0 to 5.5V -90 -67 -42
CSN
= 0 to 5.5V -210 -166 -122
CSN
= 33V, V
BST
= 5V,
PVL
0.03 20 µA
(Note 1) 4.5 28.0 V
V
= 0.75V 7.75 9.00 V
FB2
SYNC/EN
= 0 3 10 µA
0.784 0.80 0.808 V
= 0.75V 0.01 100 nA
C2
= 5V, V
DRV2
V
= 6V, V
IN
I
= +250µA, -250µA 0.12 0.2 0.36 S
DRV2
DRV2
= 5V, V
= 0.77V 15 30 mA
FB2
= 0.70V 8 10 12 mA
FB2
128V
= 5V, I
DRV3P
V
= 5V, I
DRV3P
= 0.75V 0.01 100 nA
FB3P
= 0.75V
FB3P
= 1mA 0.790 0.803 0.816 V
DRV3P
= 0.5mA to 5mA 0.38 0.6 1.1 S
DRV3P
DRV3P = 2.5V 15 35
DRV3P = 4.0V 40
Clock
Cycles
mV
mV
mA
MAX8513/MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VLX= V
SUP2
= 12V, V
PVL
= V
BST
- VLX= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, CVL= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUT3N (NEGATIVE NPN LDO CONTROLLER) (MAX8514 ONLY)
SUP3N Operating Range (Note 1) 1.5 5.5 V
DRV3N Operating Range (Note 1)
SUP3N Supply Current
FB3N Regulation Voltage
FB3N to DRV3N Large-Signal
Transconductance
Feedback Input Bias Current V
Driver Source Current
FB3N POR Threshold 450 500 550 mV
FB3N Soft-Start Period 2048
REFERENCE
REF Output Voltage V
OSCILLATOR
FREQ Resistance-Frequency
Product
Maximum Duty Cycle
(Measured at DH Pin)
Minimum On-Time
(Measured at DH Pin)
SYNC/EN Pulse Width Low or high (Note 1) 200 ns
SYNC/EN Frequency Range
SYNC/EN Input Voltage, High 2.4 V
SYNC/EN Input Voltage, Low 0.8 V
SYNC/EN Input Current V
G
C3N
REF
S
V
SUP3N
V
- 21V
V
= 1.5V, V
DRV3N
= -1mA (source)
I
DRV3N
V
= 1.5V, V
DRV3N
= -1mA (source)
I
DRV3N
V
= 0, I
DRV3N
DRV3N
(source)
= -100mV 60 1000 nA
FB3N
V
= 200mV, V
FB3N
= 3.5V
V
SUP3N
-2µA < I
R
FREQ
R
FREQ
R
FREQ
< +50µA 1.231 1.25 1.269 V
REF
= 10.7kΩ ±1% from FREQ to GND 1300 1390 1460
= 15.0kΩ ±1% from FREQ to GND 933 985 1040Frequency f
= 50.0kΩ ±1% from FREQ to GND 260 290 324
= 3.5V,
SUP3N
= 3.5V,
SUP3N
= -0.5mA to -5mA
= 0,
DRV3N
1.1 2 mA
-20 -5 +10 mV
0.225 0.36 0.550 S
13 25 mA
15.0
R
= 10.7kΩ ±1% from FREQ to GND 77 83 91
FREQ
R
= 15.0kΩ ±1% from FREQ to GND 80 87 95
FREQ
= 50.0kΩ ±1% from FREQ to GND 93 96 99
R
FREQ
R
= 10.7kΩ ±1% from FREQ to GND 20 62 ns
FREQ
SYNC/EN input frequency needs to be
within ±30% of the value set at the FREQ
200 1850 kHz
pin (Note 1)
= 0 to 5.5V -1 +1 µA
SYNC/EN
SUP3N
- 1.5V
V
Clock
Cycles
kHz
MHz
× kΩ
%
MAX8513/MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VLX= V
SUP2
= 12V, V
PVL
= V
BST
- VLX= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, CVL= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS
(VIN= VLX= V
SUP2
= 12V, V
PVL
= V
BST
- VLX= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, CVL= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ, T
A
= -40°C to +125°C (Note 2), unless otherwise noted.)
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 V
POR Output-Voltage Low
POR Output Leakage Current
POR Power-Ready Delay Time
PFI Input Threshold Falling, V
PFI Input Bias Current V
PFO Output-Voltage Low PFI = 1.1V
PFO Output Leakage Current PFI = 1.4V, PFO = 5V 0.001 1 µA
THERMAL PROTECTION
Thermal Shutdown Junction temperature rising +170 °C
Thermal-Shutdown Hysteresis 25 °C
= 0 to V
V
V
V
SEQ
FB1
FB3N
FB1
, V
, V
VL
, V
FB2
FB3P
, out-of-regulation
, and V
FB2
regulation
From V
FB1
, V
FB2
regulation to POR = high impedance
HYST
= 1.0V 0.1 100 nA
PFI
110µA
I
= 1.6mA 10 200
or V
FB3P
POR
I
POR
V
IN
FB3N
or V
= 0.1mA,
= 1.0V
, in-
FB3N
, in-
20 200
0.001 1 µA
140 315 560 ms
,
FB3P
, and V
= 20mV 1.20 1.22 1.25 V
I
= 1.6mA 20 200
PFO
= 0.1mA,
I
PFO
V
IN
= 1.0V
10 200
mV
mV
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
GENERAL
IN Operating Range
IN Supply Current
IN Shutdown Current V
VL REGULATOR
VL Output Voltage VIN = 6V to 28V, IVL = 0.1mA to 40mA 4.75 5.25 V
VL Dropout Voltage From IN to VL, VIN = 5V, IVL = 40mA 610 mV
VL Undervoltage Threshold VL rising, V
5.5 28.0
IN = VL 4.5 5.5
= 1.3V, V
V
FB1
include switching current to PVL and BST,
FB2
= V
FB3
= 1.0V, does not
3.2 mA
SYNC/EN = VL
SYNC/EN
= 0, R
HYST
= 50kΩ 300 µA
FREQ
= 675mV (typ) 3.6 4.2 V
V
MAX8513/MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VLX= V
SUP2
= 12V, V
PVL
= V
BST
- VLX= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, CVL= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ, T
A
= -40°C to +125°C (Note 2), unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
OUT1 (BUCK CONVERTER)
Output Voltage Range V
FB1 Regulation Threshold V
Error-Amplifier Open-Loop
Voltage Gain
FB1 Input Bias Current I
DH Output-Resistance High R
DH Output-Resistance Low R
DL Output-Resistance High R
DL Output-Resistance Low R
Current-Limit Threshold
(Positive)
Current-Limit Threshold
(Negative)
CSP and CSN Bias Current V
ILIM Bias Current V
SS Soft-Start Charge Current VSS = 0.6V 15 35 µA
Soft-Start Discharge Resistance 200 Ω
LX, BST, PVL Leakage Current
FB1 Power-On Reset Threshold 1.08 1.20 V
OUT2 (POSITIVE LDO)
SUP2 Operating Range V
DRV2 Clamp Voltage V
SUP2 Supply Current 300 µA
SUP2 Shutdown Supply Current V
FB2 Regulation Voltage V
FB2 Input Bias Current I
DRV2 Output Current Limit VIN = 5V, V
DRV2 Output Current Limit
During Soft-Start
FB2 Power-On Reset Threshold 0.690 0.742 V
FB2 to DRV2 Transconductance G
OUT1
FB1
A
VOL
FB1_BIASVFB1
DH_HIGH
DH_LOW
DL_HIGH
DL_LOW
V
CS
V
CS
SUP2
DRV2
FB2
FB2_BIASVFB2
C2
(Note 1) 1.25 5.50 V
1.225 1.265 V
65 dB
= 1.3V -200 +200 nA
2.55 Ω
2.1 Ω
5 Ω
1.3 Ω
V
= 2.00V, V
ILIM
V
= 0.50V, V
ILIM
V
= VVL, V
ILIM
V
= 2.00V, V
ILIM
V
= 0.50V, V
ILIM
V
= VVL, V
ILIM
= V
CSP
CSN
= 1.25V -5.7 -4.3 µA
ILIM
V
= VIN = 28V, V
LX
V
SYNC/EN
= 0
= 0 to 5.5V 243 303
CSN
= 0 to 5.5V 49 83
CSN
= 0 to 5.5V 147 190
CSN
= 0 to 5.5V -333 -199
CSN
= 0 to 5.5V -90 -42
CSN
= 0 to 5.5V -210 -122
CSN
= 0 to 5.5V -120 +135 µA
BST
= 33V, V
PVL
= 5V,
20 µA
(Note 1) 4.5 28.0 V
V
= 0.75V 7.75 9.00 V
FB2
SYNC/EN
= 0 10 µA
0.775 0.816 V
= 0.75V 150 nA
= 5V, V
DRV2
= 6V, V
V
IN
I
= +250µA, -250µA 0.11 0.41 S
DRV2
DRV2
= 5V, V
= 0.77V 12 mA
FB2
= 0.70V 8 12 mA
FB2
mV
mV
MAX8513/MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
_______________________________________________________________________________________ 7
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VLX= V
SUP2
= 12V, V
PVL
= V
BST
- VLX= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, CVL= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ, T
A
= -40°C to +125°C (Note 2), unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
OUT3P (POSITIVE PNP LDO) (MAX8513 ONLY)
DRV3P Operating Range V
FB3P Regulation Voltage V
FB3P to DRV3P Large-Signal
Transconductance
Feedback Input Bias Current V
Driver Sink Current V
FB3P POR Threshold 0.690 0.742 V
OUT3N (NEGATIVE NPN LDO CONTROLLER) (MAX8514 ONLY)
SUP3N Operating Range (Note 1) 1.5 5.5 V
DRV3N Operating Range (Note 1)
SUP3N Supply Current
FB3N Regulation Voltage
FB3N to DRV3N Large-Signal
Transconductance
Feedback Input Bias Current V
Driver Source Current
FB3N POR Threshold 450 550 mV
REFERENCE
REF Output Voltage V
OSCILLATOR
Frequency f
Maximum Duty Cycle
(Measured at DH Pin)
Minimum On-Time
(Measured at DH Pin)
SYNC/EN Pulse Width Low or high (Note 1) 200 ns
SYNC/EN Frequency Range
DRV3P
G
C3PVDRV3P
G
C3N
REF
S
128V
= 5V, I
DRV3P
= 5V, I
= 0.75V 100 nA
FB3P
= 0.75V DRV3P = 2.5V 15 mA
FB3P
V
= 1.5V, V
DRV3N
I
= -1mA (source)
DRV3N
V
= 1.5V, V
DRV3N
I
= -1mA (source)
DRV3N
V
= 0, I
DRV3N
(source)
= -100mV 1500 nA
FB3N
V
= 200mV, V
FB3N
= 3.5V
V
SUP3N
-2µA < I
R
FREQ
R
FREQ
R
FREQ
R
FREQ
R
FREQ
R
FREQ
R
FREQ
< +50µA 1.22 1.27 V
REF
= 10.7kΩ ±1% from FREQ to GND 1300 1500
= 15.0kΩ ±1% from FREQ to GND 917 1070
= 50.0kΩ ±1% from FREQ to GND 250 335
= 10.7kΩ ±1% from FREQ to GND 77 91
= 15.0kΩ ±1% from FREQ to GND 80 95
= 50.0kΩ ±1% from FREQ to GND 93 99
= 10.7kΩ ±1% from FREQ to GND 62 ns
= 1mA 0.780 0.820 V
DRV3P
= 0.5mA to 5mA 0.3 1.4 S
DRV3P
V
SUP3N
- 21V
= 3.5V,
SUP3N
= 3.5V,
SUP3N
= -0.5mA to -5mA
DRV3N
DRV3N
= 0,
-20 +10 mV
0.225 0.550 S
13 mA
V
SUP3N
- 1.5V
SYNC/EN input frequency needs to be
within ±30% of the value set at the FREQ
200 1850 kHz
pin (Note 1)
2mA
V
kHz
%
MAX8513/MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
8 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VLX= V
SUP2
= 12V, V
PVL
= V
BST
- VLX= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, CVL= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ, T
A
= -40°C to +125°C (Note 2), unless otherwise noted.)
Note 1: Guaranteed by design, not production tested.
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
SYNC/EN Input-Voltage High 2.4 V
SYNC/EN Input-Voltage Low 0.8 V
SYNC/EN Input Current V
SEQ, PFI, PFO, POR
SEQ Input-Voltage High 2.4 V
SEQ Input-Voltage Low 0.8 V
SEQ Input Current V
POR Output-Voltage Low
POR Output Leakage Current
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
POR Power-Ready Delay Time
PFI Input Threshold Falling, V
PFI Input Bias Current V
PFO Output-Voltage Low PFI = 1.1V
PFO Output Leakage Current PFI = 1.4V, PFO = 5V 1 µA
SYNC/EN
SEQ
V
FB1
V
FB3N
V
FB1
regulation
From V
regulation to POR = high impedance
PFI
= 0 to 5.5V -1 +1 µA
= 0 to V
VL
, V
, V
FB2
FB3P
out-of-regulation
, V
, and V
FB2
, V
FB1
FB2
HYST
= 1.0V 300 nA
I
or V
FB3P
POR
I
POR
V
IN
FB3N
or V
I
PFO
I
PFO
V
IN
= 1.0V
= 1.0V
,
FB3P
, and V
= 20mV 1.20 1.25 V
= 1.6mA 200
= 0.1mA,
, in-
, in-
FB3N
= 1.6mA 200
= 0.1mA,
140 560 ms
10 µA
200
1µA
200
mV
mV
MAX8513/MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
_______________________________________________________________________________________ 9
Typical Operating Characteristics
(Circuit of MAX8513 evaluation kit, VIN= 12V, TA= +25°C, fS= 1.4MHz, unless otherwise noted.)
EFFICIENCY vs. INPUT VOLTAGE
EFFICIENCY vs. I
100
90
80
70
60
50
40
EFFICIENCY (%)
30
V
= 3.3V, I
OUT1
(V)
OUT2
V
20
10
0
2.55
2.54
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
2.45
= 2.5V, I
V
OUT2
= 12V, I
V
OUT3
718
V
= 3.3V AT 1A
OUT1
= 12V AT 25mA
V
OUT3
0
V
OUT1
OUT2
OUT3
OUT2
= 2A
= 1.5A
= 50mA
VIN (V)
vs. I
0.8
I
OUT2
(A)
OUT2
171614 159 10 11 12 138
1.4
1.2
1.00.4 0.60.2
MAX8513/14 toc01
MAX8513/14 toc04
100
90
80
70
60
50
40
EFFICIENCY (%)
12.25
12.20
12.15
12.10
12.05
(V)
12.00
OUT3
V
11.95
11.90
11.85
11.80
11.75
VIN = 16V
30
20
10
0
0.1
V
= 3.3V AT 1A
OUT1
= 2.5V AT 0.75A
V
OUT2
050
(I
OUT2
VIN = 12V
V
= 0, I
OUT3
I
I
OUT3
VIN = 9V
OUT1
vs. I
OUT3
(A)
(mA)
OUT3
OUT1
= 0)
3.35
3.34
3.33
MAX8513/14 toc02
3.32
3.31
(V)
3.30
OUT1
V
3.29
3.28
3.27
3.26
MAX8513/14 toc05
(V)
OUT1
V
3.25
3.35
3.34
3.33
3.32
3.31
3.30
3.29
3.28
3.27
3.26
3.25
4.1
3.6
3.12.1 2.61.1 1.60.6
454030 3510 15 20 255
V
vs. I
OUT1
V
= 2.5V AT 0.75A
OUT2
= 12V AT 25mA
V
OUT3
0
V
V
= 2.5V AT 0.75A
OUT2
= 12V AT 25mA
V
OUT3
718
OUT1
I
I
OUT1
OUT1
I
OUT1
VIN (V)
(A)
vs. V
= 0
= 3A
OUT1
IN
MAX8513/14 toc03
4.0
3.5
3.02.0 2.51.0 1.50.5
MAX8513/14 toc06
171614 159 10 11 12 138
V
vs. V
2.55
V
OUT1
2.54
V
OUT3
2.53
2.52
2.51
(V)
2.50
OUT2
V
2.49
2.48
2.47
2.46
2.45
718
OUT2
= 3.3V AT 1A
= 12V AT 25mA
I
OUT2
I
OUT2
VIN (V)
IN
= 0
= 1.5A
171614 159 10 11 12 138
MAX8513/14 toc07
12.35
V
= 3.3V AT 1A
OUT1
12.30
12.25
12.20
12.15
(V)
12.10
OUT3
V
12.05
12.00
11.95
11.90
11.85
= 2.5V AT 0.75A
V
OUT2
718
V
OUT3
I
vs. V
OUT3
I
OUT3
VIN (V)
= 0
= 50mA
OSCILLATOR FREQUENCY
IN
171614 159 10 11 12 138
1.43
1.42
MAX8513/14 toc08
1.41
1.40
1.39
1.38
1.37
OSCILLATOR FREQUENCY (MHz)
1.36
1.35
718
vs. INPUT VOLTAGE
R
= 10.7kΩ
FREQ
TA = -40°C
TA = +85°C
VIN (V)
TA = +25°C
MAX8513/14 toc09
171614 159 10 11 12 138
MAX8513/MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
10 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of MAX8513 evaluation kit, VIN= 12V, TA= +25°C, fS= 1.4MHz, unless otherwise noted.)
OUTPUT1 LOAD-TRANSIENT RESPONSE
I
50mV/div
50mV/div
100mV/div
0A
OUT2
= 0.75A, I
OUT3
= 25mA
40µs/div
MAX8513/14 toc10
SWITCHING WAVEFORMS
(ALL OUTPUTS AT FULL LOAD)
0V
0V
0V
0V
MAX8513/14 toc12
V
OUT1
AC-COUPLED
V
OUT2
AC-COUPLED
V
OUT3
AC-COUPLED
I
OUT1
1A/div
V
DH
10V/div
V
DL
5V/div
V
LX
10V/div
V
D2
(ANODE)
20V/div
OUTPUT3 LOAD-TRANSIENT RESPONSE
I
= 1A, I
OUT2
= 0.75A
40µs/div
OUT1
50mV/div
50mV/div
50mV/div
5mA
SYNCHRONIZATION
0V
0V
0V
MAX8513/14 toc11
MAX8513/14 toc13
V
OUT1
AC-COUPLED
V
OUT2
AC-COUPLED
V
OUT3
AC-COUPLED
I
OUT3
50mA/div
V
DH
5V/div
V
DL
10V/div
SYNC/EN
5V/div
200ns/div
PFO RESPONSE
0V
0V
0V
I
= 2A, I
OUT2
= 1.5A, I
2ms/div
OUT1
OUT3
= 50mA
MAX8513/14 toc14
PFO
2V/div
V
IN
5V/div
V
OUT1
2V/div
0V
0V
0V
0V
1µs/div
POR RESPONSE
100ms/div
MAX8513/14 toc15
POR
5V/div
V
OUT1
2V/div
V
OUT2
5V/div
V
OUT3
10V/div
MAX8513/MAX8514
Wide-Input, High-Frequency, Triple-Output Supplies
with Voltage Monitor and Power-On Reset
______________________________________________________________________________________ 11
Typical Operating Characteristics (continued)
(Circuit of MAX8513 evaluation kit, VIN= 12V, TA= +25°C, fS= 1.4MHz, unless otherwise noted.)
STAGGERED SEQUENCE (SEQ = GND)
0V
0V
2ms/div
OUTPUT1 SHORT CIRCUIT
(ALL OUTPUTS AT FULL LOAD)
0V
0V
0A
MAX8513/14 toc16
MAX8513/14 toc18
SYNC/EN
5V/div
V
OUT3
5V/div
V
OUT1
2V/div
V
OUT2
2V/div
V
OUT1
2V/div
V
LX
10V/div
1
L
2A/div
TRACKING SEQUENCE (SEQ = VL)
0V
0V
4ms/div
OUTPUT1 SHORT CIRCUIT
(ALL OUTPUTS AT NO LOAD)
0V
0V
0A
MAX8513/14 toc17
MAX8513/14 toc19
SYNC/EN
5V/div
V
OUT3
5V/div
V
OUT1
2V/div
V
OUT2
2V/div
V
OUT1
2V/div
V
LX
10V/div
I
L
2A/div
20µs/div
20µs/div
OUTPUT RIPPLE AND HARMONICS
(MEASURED AT OUT1)
1.5
1.3
1.1
0.9
0.7
0.5
NOISE (mV)
0.3
0.1
-0.1
-0.3
-0.5
100 21001100 3100 4100 5100
VIN = 12V
V
OUT1
V
OUT2
V
OUT3
FREQUENCY (kHz)
= 3.3V AT 2A
= 2.5V AT 1.5A
= 12V AT 50mA
MAX8513/14 toc20
Loading...