EVALUATION KIT AVAILABLE
MAX8513/MAX8514
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 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 noise-
sensitive 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 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 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.
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
Ordering Information
PART
MAX8513EEI
MAX8514EEI
MAX8514AEI
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
Functional Diagram
V
IN
(4.5V TO 28V)
OFF
ON
MAX8513
STEP-
DOWN
CONTROLLER
V
OUT1
(1.25V TO 5.5V)
SYNC
OUTPUT
POWER-ON RESET
LDO
CONTROLLER 1
V
OUT2
(0.8V TO V
OUT1
)
Applications
●
xDSL, Cable, ISDN Modems, and Routers
●
Wireless Routers
●
Set-Top Boxes
Pin Configurations appear at end of data sheet.
INPUT POWER-
FAIL MONITOR
LDO
CONTROLLER 2
V
OUT3
(0.8V TO 27V)
19-3178; Rev 1; 4/14
MAX8513/MAX8514
Wide-Input, High-Frequency Triple-Output Supplies
with Voltage Monitor and Power-On Reset
Absolute Maximum Ratings
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
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
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.
Electrical Characteristics
(V
IN
= V
LX
= V
SUP2
= 12V, V
PVL
= V
BST
- V
LX
= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, C
VL
= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
GENERAL
IN Operating Range
5.5
IN = VL
V
FB1
= 1.3V, V
FB2
= V
FB3
= 1.0V, does
not include switching current to PVL and
BST, SYNC/EN = VL
V
SYNC/EN
= 0, R
FREQ
= 50kΩ
V
IN
= 6V to 28V, I
VL
= 0.1mA to 40mA
From IN to VL, V
IN
= 5V, I
VL
= 40mA
V
IN
= 6V to 28V, I
VL
= 5mA
VL rising, V
HYST
= 675mV (typ)
V
OUT1
V
FB1
A
VOL
I
FB1_BIAS
V
FB1
= 1.3V
(Note 1)
3.6
1.25
1.234
65
-200
1.25
90
+10
25
R
DH_HIGH
R
DH_LOW
R
DL_HIGH
R
DL_LOW
t
dt
Starts from V
DL
= 1V or (V
DH
- V
LX
) = 1V
1.5
1.2
2.5
0.7
50
2.55
2.1
5
1.3
+200
0.05
4.2
5.50
1.259
4.75
4.5
2.6
200
5
28.0
5.5
3.2
300
5.25
560
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
IN Supply Current
IN Shutdown Current
VL REGULATOR
VL Output Voltage
VL Dropout Voltage
VL Line Regulation
VL Undervoltage Threshold
OUT1 (BUCK CONVERTER)
Output Voltage Range
FB1 Regulation Threshold
Error-Amplifier Open-Loop
Voltage Gain
FB1 Input Bias Current
Error-Amplifier Gain Bandwidth
DH Output-Resistance High
DH Output-Resistance Low
DL Output-Resistance High
DL Output-Resistance Low
Driver Dead Time
mA
µA
V
mV
%
V
V
V
dB
nA
MHz
Ω
Ω
Ω
Ω
ns
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Maxim Integrated
│
2
MAX8513/MAX8514
Wide-Input, High-Frequency Triple-Output Supplies
with Voltage Monitor and Power-On Reset
Electrical Characteristics (continued)
(V
IN
= V
LX
= V
SUP2
= 12V, V
PVL
= V
BST
- V
LX
= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, C
VL
= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Current-Limit Threshold (Positive)
SYMBOL
V
CS
CONDITIONS
V
ILIM
= 2.00V, V
CSN
= 0 to 5.5V
V
ILIM
= 0.50V, V
CSN
= 0 to 5.5V
V
ILIM
= V
VL
, V
CSN
= 0 to 5.5V
Current-Limit Threshold
(Negative)
CSP and CSN Bias Current
ILIM Bias Current
SS Soft-Start Charge Current
Soft-Start Discharge Resistance
LX, BST, PVL Leakage Current
FB1 Power-On Reset Threshold
OUT2 (POSITIVE LDO)
SUP2 Operating Range
DRV2 Clamp Voltage
SUP2 Supply Current
SUP2 Shutdown Supply Current
FB2 Regulation Voltage
FB2 Input Bias Current
DRV2 Output Current Limit
DRV2 Output Current Limit
During Soft-Start
FB2 Power-On Reset Threshold
FB2 to DRV2 Transconductance
DRV3P Operating Range
FB3P Regulation Voltage
FB3P to DRV3P Large-Signal
Transconductance
Feedback Input Bias Current
Driver Sink Current
FB3P POR Threshold
FB3P Soft-Start Period
G
C3P
G
C2
V
DRV3P
V
DRV3P
= 5V, I
DRV3P
= 1mA
V
DRV3P
= 5V, I
DRV3P
= 0.5mA to 5mA
V
FB3P
= 0.75V
V
FB3P
= 0.75V
DRV3P = 2.5V
DRV3P = 4.0V
0.690
15
I
DRV2
= +250µA, -250µA
OUT3P (POSITIVE PNP LDO) (MAX8513 ONLY)
1
0.790
0.38
0.803
0.6
0.01
35
40
0.720
1312
0.742
28
0.816
1.1
100
V
V
S
nA
mA
V
Clock
Cycles
V
FB2
I
FB2_BIAS
V
FB2
= 0.75V
V
IN
= 5V, V
DRV2
= 5V, V
FB2
= 0.77V
V
IN
= 6V, V
DRV2
= 5V, V
FB2
= 0.70V
15
8
0.690
0.12
V
SYNC/EN
= 0
0.784
V
SUP2
V
DRV2
(Note 1)
V
FB2
= 0.75V
4.5
7.75
160
3
0.80
0.01
30
10
0.720
0.2
12
0.742
0.36
28.0
9.00
300
10
0.808
100
V
V
µA
µA
V
nA
mA
mA
V
S
V
LX
= V
IN
= 28V, V
BST
= 33V, V
PVL
= 5V,
V
SYNC/EN
= 0
1.08
V
ILIM
= 2.00V, V
CSN
= 0 to 5.5V
V
CS
V
ILIM
= 0.50V, V
CSN
= 0 to 5.5V
V
ILIM
= V
VL
, V
CSN
= 0 to 5.5V
V
CSP
= V
CSN
= 0 to 5.5V
V
ILIM
= 1.25V
V
SS
= 0.6V
MIN
246
50
151
-333
-90
-210
-120
-5.3
15
-5
25
100
0.03
1.125
TYP
275
67
170
-272
-67
-166
MAX
300
81
188
-199
-42
-122
+135
-4.7
35
200
20
1.20
µA
µA
µA
Ω
µA
V
mV
mV
UNITS
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Maxim Integrated
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3
MAX8513/MAX8514
Wide-Input, High-Frequency Triple-Output Supplies
with Voltage Monitor and Power-On Reset
Electrical Characteristics (continued)
(V
IN
= V
LX
= V
SUP2
= 12V, V
PVL
= V
BST
- V
LX
= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, C
VL
= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SUP3N Operating Range
DRV3N Operating Range
SUP3N Supply Current
FB3N Regulation Voltage
FB3N to DRV3N Large-Signal
Transconductance
Feedback Input Bias Current
Driver Source Current
FB3N POR Threshold
FB3N Soft-Start Period
REFERENCE
REF Output Voltage
OSCILLATOR
R
FREQ
= 10.7kΩ ±1% from FREQ to GND
Frequency
FREQ Resistance-Frequency
Product
R
FREQ
= 10.7kΩ ±1% from FREQ to GND
Maximum Duty Cycle
(Measured at DH Pin)
Minimum On-Time
(Measured at DH Pin)
SYNC/EN Pulse Width
SYNC/EN Frequency Range
SYNC/EN Input Voltage, High
SYNC/EN Input Voltage, Low
SYNC/EN Input Current
V
SYNC/EN
= 0 to 5.5V
-1
R
FREQ
= 15.0kΩ ±1% from FREQ to GND
R
FREQ
= 50.0kΩ ±1% from FREQ to
GND
R
FREQ
= 10.7kW
±1% from FREQ to GND
Low or high (Note 1)
SYNC/EN input frequency needs to be
within ±30% of the value set at the FREQ
pin (Note 1)
200
200
2.4
0.8
+1
1850
77
80
93
f
S
R
FREQ
= 15.0kΩ ±1% from FREQ to GND
R
FREQ
= 50.0kΩ ±1% from FREQ to GND
1300
933
260
1390
985
290
15.0
83
87
96
20
91
95
99
62
ns
ns
kHz
V
V
µA
%
1460
1040
324
MHz
x kΩ
kHz
V
REF
-2µA < I
REF
< +50µA
1.231
1.25
1.269
V
G
C3N
SYMBOL
(Note 1)
(Note 1)
V
DRV3N
= 1.5V, V
SUP3N
= 3.5V,
I
DRV3N
= -1mA (source)
V
DRV3N
= 1.5V, V
SUP3N
= 3.5V,
I
DRV3N
= -1mA (source)
V
DRV3N
= 0, I
DRV3N
= -0.5mA to -5mA
(source)
V
FB3N
= -100mV
V
FB3N
= 200mV, V
DRV3N
= 0,
V
SUP3N
= 3.5V
13
450
-20
0.225
CONDITIONS
MIN
1.5
V
SUP3N
- 21V
1.1
-5
0.36
60
25
500
2048
550
TYP
MAX
5.5
V
SUP3N
- 1.5V
2
+10
0.550
1000
UNITS
V
V
mA
mV
S
nA
mA
mV
Clock
Cycles
OUT3N (NEGATIVE NPN LDO CONTROLLER) (MAX8514 ONLY)
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Maxim Integrated
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4
MAX8513/MAX8514
Wide-Input, High-Frequency Triple-Output Supplies
with Voltage Monitor and Power-On Reset
Electrical Characteristics (continued)
(V
IN
= V
LX
= V
SUP2
= 12V, V
PVL
= V
BST
- V
LX
= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, C
VL
= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
SEQ, PFI,
PFO, POR
PARAMETER
SYMBOL
CONDITIONS
MIN
2.4
0.8
V
SEQ
= 0 to V
VL
V
FB1
, V
FB2
, V
FB3P
,
V
FB3N
, out-of-regulation
I
POR
= 1.6mA
I
POR
= 0.1mA,
V
IN
= 1.0V
1
10
20
0.001
140
1.20
I
PFO
= 1.6mA
I
PFO
= 0.1mA,
V
IN
= 1.0V
315
1.22
0.1
20
10
0.001
+170
25
10
200
200
1
560
1.25
100
200
200
1
mV
µA
°C
°C
mV
TYP
MAX
UNITS
V
V
µA
SEQ Input-Voltage High
SEQ Input-Voltage Low
SEQ Input Current
POR
Output-Voltage Low
POR
Output Leakage Current
POR
Power-Ready Delay Time
PFI Input Threshold
PFI Input Bias Current
PFO
Output-Voltage Low
PFO
Output Leakage Current
THERMAL PROTECTION
Thermal Shutdown
Thermal-Shutdown Hysteresis
V
FB1
, V
FB2
, and V
FB3P
or V
FB3N
,
in-regulation
From V
FB1
, V
FB2
, and V
FB3P
or V
FB3N
,
in-regulation to
POR
= high impedance
Falling, V
HYST
= 20mV
V
PFI
= 1.0V
PFI = 1.1V
PFI = 1.4V,
PFO
= 5V
Junction temperature rising
µA
ms
V
nA
Electrical Characteristics
(V
IN
= V
LX
= V
SUP2
= 12V, V
PVL
= V
BST
- V
LX
= V
DRV3P
= 5V, V
SUP3N
= 3.3V, V
DRV3N
= -5V, C
VL
= 4.7µF, C
REF
= 0.22µF, R
FREQ
=
15.0kΩ,
T
A
= -40°C to +125°C
(Note 2), unless otherwise noted.)
PARAMETER
GENERAL
IN Operating Range
5.5
IN = VL
V
FB1
= 1.3V, V
FB2
= V
FB3
= 1.0V, does not
include switching current to PVL and BST,
SYNC/EN = VL
V
SYNC/EN
= 0, R
FREQ
= 50kΩ
V
IN
= 6V to 28V, I
VL
= 0.1mA to 40mA
From IN to VL, V
IN
= 5V, I
VL
= 40mA
VL rising, V
HYST
= 675mV (typ)
3.6
4.75
4.5
28.0
5.5
3.2
300
5.25
610
4.2
V
SYMBOL
CONDITIONS
MIN
MAX
UNITS
IN Supply Current
IN Shutdown Current
VL REGULATOR
VL Output Voltage
VL Dropout Voltage
VL Undervoltage Threshold
mA
µA
V
mV
V
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