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Part Number MAX5033

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General Description
The MAX5033 easy-to-use, high-efficiency, high-voltage,
step-down DC-DC converter operates from an input volt-
age up to 76V and consumes only 270µA quiescent cur-
rent at no load. This pulse-width modulated (PWM)
converter operates at a fixed 125kHz switching frequen-
cy at heavy loads, and automatically switches to pulse-
skipping mode to provide low quiescent current and
high efficiency at light loads. The MAX5033 includes
internal frequency compensation simplifying circuit
implementation. The device uses an internal low-on-
resistance, high-voltage, DMOS transistor to obtain high
efficiency and reduce overall system cost. This device
includes undervoltage lockout, cycle-by-cycle current
limit, hiccup-mode output short-circuit protection, and
thermal shutdown.
The MAX5033 delivers up to 500mA output current.
The output current may be limited by the maximum
power dissipation capability of the package. External
shutdown is included, featuring 10µA (typ) shutdown
current. The MAX5033A/B/C versions have fixed output
voltages of 3.3V, 5V, and 12V, respectively, while the
MAX5033D features an adjustable output voltage, from
1.25V to 13.2V.
The MAX5033 is available in space-saving 8-pin SO
and 8-pin plastic DIP packages and operates over the
automotive (-40°C to +125°C) temperature range.
Applications
Automotive
Consumer Electronics
Industrial
Distributed Power
Features
o Wide 7.5V to 76V Input Voltage Range
o Fixed (3.3V, 5V, 12V) and Adjustable (1.25V to
13.2V) Voltage Versions
o 500mA Output Current
o Efficiency Up to 94%
o Internal 0.4 High-Side DMOS FET
o 270µA Quiescent Current at No Load, 10µA
Shutdown Current
o Internal Frequency Compensation
o Fixed 125kHz Switching Frequency
o Thermal Shutdown and Short-Circuit Current Limit
o 8-Pin SO and PDIP Packages
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
19-2979; Rev 2; 5/04
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.
PART
TEMP RANGE
PIN-
PACKAGE
OUTPUT
VOLTAGE
(V)
MAX5033AUSA
0
°C to +85°C
8 SO
MAX5033AUPA
0
°C to +85°C
8 PDIP
MAX5033AASA
-40
°C to +125°C 8 SO
3.3
MAX5033BUSA
0
°C to +85°C
8 SO
MAX5033BUPA
0
°C to +85°C
8 PDIP
MAX5033BASA
-40
°C to +125°C 8 SO
5.0
MAX5033CUSA
0
°C to +85°C
8 SO
MAX5033CUPA
0
°C to +85°C
8 PDIP
MAX5033CASA
-40
°C to +125°C 8 SO
12
MAX5033DUSA
0
°C to +85°C
8 SO
MAX5033DUPA
0
°C to +85°C
8 PDIP
MAX5033DASA
-40
°C to +125°C 8 SO
ADJ
1
2
3
4
BST
VD
SGND
FB
8
7
6
5
LX
V
IN
GND
ON/OFF
MAX5033
SO/PDIP
Pin Configuration
MAX5033
GND
BST
LX
V
IN
SGND
FB
D1
50SQ100
VD
220
µH
V
OUT
5V, 0.5A
V
IN
7.5V TO 76V
47
µF
0.1
µF
0.1
µF
33
µF
ON
OFF
R1
R2
ON/OFF
Typical Operating Circuit
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
(Voltages referenced to GND, unless otherwise specified.)
V
IN
.........................................................................-0.3V to +80V
SGND ....................................................................-0.3V to +0.3V
LX.................................................................-0.8V to (V
IN
+ 0.3V)
BST ...............................................................-0.3V to (V
IN
+ 10V)
BST (transient < 100ns) ................................-0.3V to (V
IN
+ 15V)
BST to LX................................................................-0.3V to +10V
BST to LX (transient < 100ns) ................................-0.3V to +15V
ON/OFF........................................................-0.3V to (V
IN
+ 0.3V)
VD...........................................................................-0.3V to +12V
FB
MAX5033A/MAX5033B/MAX5033C ...................-0.3V to +15V
MAX5033D .........................................................-0.3V to +12V
V
OUT
Short-Circuit Duration...........................................Indefinite
VD Short-Circuit Duration ..............................................Indefinite
Continuous Power Dissipation (T
A
= +70°C)
8-Pin PDIP (derate 9.1mW/°C above +70°C)...............727mW
8-Pin SO (derate 5.9mW/
°C above +70°C)..................471mW
Operating Temperature Range
MAX5033_U_ _ ...................................................0
°C to +85°C
MAX5033_A_ _ ..............................................-40
°C to +125°C
Storage Temperature Range .............................-65
°C to +150°C
Junction Temperature ......................................................+150
°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS (MAX5033_U_ _)
(V
IN
= +12V, V
ON/OFF
= +12V, I
OUT
= 0, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C. See the
Typical Application Circuit.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5033A
7.5
76.0
MAX5033B
7.5
76.0
MAX5033C
15
76
Input Voltage Range
V
IN
MAX5033D
7.5
76.0
V
Undervoltage Lockout
UVLO
5.2
V
MAX5033A, V
IN
= 7.5V to 76V,
I
OUT
= 20mA to 500mA
3.185
3.3
3.415
MAX5033B, V
IN
= 7.5V to 76V,
I
OUT
= 20mA to 500mA
4.85
5.0
5.15
Output Voltage
V
OUT
MAX5033C, V
IN
= 15V to 76V,
I
OUT
= 20mA to 500mA
11.64
12
12.36
V
Feedback Voltage
V
FB
V
IN
= 7.5V to 76V, MAX5033D
1.192
1.221
1.250
V
V
IN
= 12V, I
LOAD
= 500mA, MAX5033A
86
V
IN
= 12V, I
LOAD
= 500mA, MAX5033B
90
V
IN
= 24V, I
LOAD
= 500mA, MAX5033C
94
Efficiency
V
IN
= 12V, V
OUT
= 5V, I
LOAD
= 500mA,
MAX5033D
90
%
V
FB
= 3.5V, V
IN
= 7.5V to 76V, MAX5033A
270
440
V
FB
= 5.5V, V
IN
= 7.5V to 76V, MAX5033B
270
440
V
FB
= 13V, V
IN
= 15V to 76V, MAX5033C
270
440
Quiescent Supply Current
I
Q
V
FB
= 1.3V, MAX5033D
270
440
µA
Shutdown Current
I
SHDN
V
ON/OFF
= 0V, V
IN
= 7.5V to 76V
10
45
µA
Peak Switch Current Limit
I
LIM
(Note 1)
0.95
1.5
2.1
A
Switch Leakage Current
I
OL
V
IN
= 76V, V
ON/OFF
= 0V, V
LX
= 0V
1
µA
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (MAX5033_U_ _) (continued)
(V
IN
= +12V, V
ON/OFF
= +12V, I
OUT
= 0, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C. See the
Typical Application Circuit.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Switch On-Resistance
R
DS(ON)
I
SWITCH
= 500mA
0.4
0.80
PFM Threshold
I
PFM
Minimum switch current in any cycle
35
65
95
mA
FB Input Bias Current
I
B
MAX5033D
-150
+0.01
+150
nA
ON/
OFF CONTROL INPUT
ON/OFF Input-Voltage Threshold
V
ON/OFF
Rising trip point
1.53
1.69
1.85
V
ON/OFF Input-Voltage Hysteresis
V
HYST
100
mV
ON/OFF Input Current
I
ON/OFF
V
ON/OFF
= 0V to V
IN
10
150
nA
OSCILLATOR
Oscillator Frequency
f
OSC
109
125
135
kHz
Maximum Duty Cycle
D
MAX
MAX5033D
95
%
VOLTAGE REGULATOR
Regulator Output Voltage
VD
V
IN
= 8.5V to 76V, I
L
= 0mA
6.9
7.8
8.8
V
Dropout Voltage
7.5V
V
IN
8.5V, I
L
= 1mA
2.0
V
Load Regulation
VD/I
VD
0 to 5mA
150
PACKAGE THERMAL CHARACTERISTICS
SO package (JEDEC 51)
170
Thermal Resistance
(Junction to Ambient)
JA
DIP package (JEDEC 51)
110
°C/W
THERMAL SHUTDOWN
Thermal-Shutdown Junction
Temperature
T
SH
+160
°C
Thermal-Shutdown Hysteresis
T
HYST
20
°C
ELECTRICAL CHARACTERISTICS (MAX5033_A_ _)
(V
IN
= +12V, V
ON
/
OFF
= +12V, I
OUT
= 0, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. See
the Typical Application Circuit.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5033A
7.5
76.0
MAX5033B
7.5
76.0
MAX5033C
15
76
Input Voltage Range
V
IN
MAX5033D
7.5
76.0
V
Undervoltage Lockout
UVLO
5.2
V
MAX5033A, V
IN
= 7.5V to 76V,
I
OUT
= 20mA to 500mA
3.185
3.3
3.415
MAX5033B, V
IN
= 7.5V to 76V,
I
OUT
= 20mA to 500mA
4.825
5.0
5.175
Output Voltage
V
OUT
MAX5033C, V
IN
= 15V to 76V,
I
OUT
= 20mA to 500mA
11.58
12
12.42
V
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (MAX5033_A_ _)
(V
IN
= +12V, V
ON
/
OFF
= +12V, I
OUT
= 0, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. See
the Typical Application Circuit.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Feedback Voltage
V
FB
V
IN
= 7.5V to 76V, MAX5033D
1.192
1.221
1.250
V
V
IN
= 12V, I
LOAD
= 500mA, MAX5033A
86
V
IN
= 12V, I
LOAD
= 500mA, MAX5033B
90
V
IN
= 24V, I
LOAD
= 500mA, MAX5033C
94
Efficiency
V
IN
= 12V, V
OUT
= 5V, I
LOAD
= 500mA,
MAX5033D
90
%
V
FB
= 3.5V, V
IN
= 7.5V to 76V, MAX5033A
270
440
V
FB
= 5.5V, V
IN
= 7.5V to 76V, MAX5033B
270
440
V
FB
= 13V, V
IN
= 15V to 76V, MAX5033C
270
440
Quiescent Supply Current
I
Q
V
FB
= 1.3V, MAX5033D
270
440
µA
Shutdown Current
I
SHDN
V
ON/OFF
= 0V, V
IN
= 7.5V to 76V
10
45
µA
Peak Switch Current Limit
I
LIM
(Note 1)
0.95
1.5
2.20
A
Switch Leakage Current
I
OL
V
IN
= 76V, V
ON/OFF
= 0V, V
LX
= 0V
1
µA
Switch On-Resistance
R
DS(ON)
I
SWITCH
= 500mA
0.4
0.80
PFM Threshold
I
PFM
Minimum switch current in any cycle
35
65
110
mA
FB Input Bias Current
I
B
MAX5033D
-150
+0.01
+150
nA
ON/
OFF CONTROL INPUT
ON/OFF Input-Voltage Threshold
V
ON/OFF
Rising trip point
1.50
1.69
1.85
V
ON/OFF Input-Voltage Hysteresis
V
HYST
100
mV
ON/OFF Input Current
I
ON/OFF
V
ON/OFF
= 0V to V
IN
10
150
nA
OSCILLATOR
Oscillator Frequency
f
OSC
105
125
137
kHz
Maximum Duty Cycle
D
MAX
MAX5033D
95
%
VOLTAGE REGULATOR
Regulator Output Voltage
VD
V
IN
= 8.5V to 76V, I
L
= 0mA
6.5
7.8
9.0
V
Dropout Voltage
7.5V
V
IN
8.5V, I
L
= 1mA
2.0
V
Load Regulation
VD/I
VD
0 to 5mA
150
PACKAGE THERMAL CHARACTERISTICS
SO package (JEDEC 51)
170
Thermal Resistance
(Junction to Ambient)
JA
DIP package (JEDEC 51)
110
°C/W
THERMAL SHUTDOWN
Thermal-Shutdown Junction
Temperature
T
SH
+160
°C
Thermal-Shutdown Hysteresis
T
HYST
20
°C
Note 1: Switch current at which the current limit is activated.
Note 2: All limits at -40°C are guaranteed by design, not production tested.
MAX5033
500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
_______________________________________________________________________________________
5
Typical Operating Characteristics
(V
IN
= 12V, V
ON/OFF
= 12V, T
A
= -40
°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25
°C. See the Typical
Application Circuit, if applicable.)
V
OUT
vs. TEMPERATURE
(MAX5033CASA, V
OUT
= 12V)
MAX5033 toc01
TEMPERATURE (
°C)
V
OUT
(V)
11.9
12.0
12.1
12.2
12.3
12.4
11.8
100
50
0
-50
150
-25
25
75
125
I
OUT
= 0.1A
I
OUT
= 0.5A
V
OUT
vs. TEMPERATURE
(MAX5033BASA, V
OUT
= 5V)
MAX5033 toc02
TEMPERATURE (
°C)
V
OUT
(V)
4.95
5.00
5.05
5.10
4.90
I
OUT
= 0.1A
I
OUT
= 0.5A
100
50
0
-50
150
-25
25
75
125
LINE REGULATION
(MAX5033CASA, V
OUT
= 12V)
MAX5033 toc03
INPUT VOLTAGE (V)
V
OUT
(V)
50
60
70
40
30
20
11.9
12.0
12.1
12.2
12.3
12.4
11.8
10
80
I
OUT
= 0A
I
OUT
= 0.5A
LINE REGULATION
(MAX5033BASA, V
OUT
= 5V)
MAX5033 toc04
INPUT VOLTAGE (V)
V
OUT
(V)
46
56
66
36
26
16
4.95
5.00
5.05
5.10
4.90
6
76
I
OUT
= 0A
I
OUT
= 0.5A
LOAD REGULATION
(MAX5033CASA, V
OUT
= 12V)
MAX5033 toc05
I
LOAD
(mA)
V
OUT
(V)
400
300
200
100
11.9
12.0
12.1
12.2
12.3
12.4
11.8
0
500
V
IN
= 24V
V
IN
= 76V
LOAD REGULATION
(MAX5033BASA, V
OUT
= 5V)
MAX5033 toc06
I
LOAD
(mA)
V
OUT
(V)
400
300
200
100
4.95
5.00
5.05
5.10
4.90
0
500
V
IN
= 7.5V, 24V
V
IN
= 76V
EFFICIENCY vs. LOAD CURRENT
(MAX5033BASA, V
OUT
= 5V)
MAX5033 toc07
LOAD CURRENT (mA)
EFFICIENCY (%)
400
300
200
100
30
50
40
20
10
70
60
100
90
80
0
0
500
V
IN
= 7.5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 48V
V
IN
= 76V
EFFICIENCY vs. LOAD CURRENT
(MAX5033CASA, V
OUT
= 12V)
MAX5033 toc08
LOAD CURRENT (mA)
EFFICIENCY (%)
400
300
200
100
30
50
40
20
10
70
60
100
90
80
0
0
500
V
IN
= 15V
V
IN
= 24V
V
IN
= 48V
V
IN
= 76V
OUTPUT CURRENT LIMIT
vs. TEMPERATURE
MAX5033 toc09
TEMPERATURE (
°C)
OUTPUT CURRENT LIMIT (A)
0.8
1.1
1.4
1.7
2.0
0.5
MAX5033BASA
5% DROP IN V
OUT
100
50
0
-50
150
-25
25
75
125