19-4586; Rev 3; 1/12
1.425V to 3.6V Input, 500mA Low-Dropout
Regulators with BIAS Input
General Description
The MAX15029/MAX15030 low-dropout linear regula-
tors operate from input voltages as low as 1.425V and
deliver up to 500mA of continuous output current with a
typical dropout voltage of only 40mV. The output volt-
age is adjustable from 0.5V to V
IN
and is ±2% accurate
over load and line variations, from -40°C to +125°C.
The MAX15030 features a BIAS input of 3V to 5.5V from
an always-on power supply. The BIAS input current is
reduced down to less than 2µA during the shutdown.
These regulators use small, 1µF ceramic input capaci-
tors and 2.2µF ceramic output capacitors to deliver
500mA output current. High bandwidth provides excel-
lent transient response and limits the output voltage devi-
ation to 10mV for a 100mA to 500mA load step, with only
a 2.2µF ceramic output capacitor, and the voltage devia-
tions can be reduced further by increasing the output
capacitor.
These devices offer a logic-controlled shutdown input
to reduce input current (I
IN
) consumption down to less
than 5.5µA in standby mode. Other features include a
soft-start to reduce inrush current, short-circuit protec-
tion, and thermal-overload protection.
The MAX15030 features a BIAS input allowing a sec-
ondary supply to keep the LDO’s internal circuitry alive
if the voltage on IN goes to 0. Both devices are fully
specified from -40°C to +125°C and are available in a
10-pin thermally enhanced TDFN package (3mm x
3mm) that includes an exposed pad for optimal power
dissipation. For a 1A version of these LDOs, refer to the
MAX15027/MAX15028 data sheet.
Features
♦
1.425V to 3.6V Input Voltage Range
♦
Output Voltage Programmable from 0.5V to V
IN
♦
Guaranteed Maximum 150mV Dropout for
Standard Package and 190mV Dropout for Side-
Wettable Package at 500mA Output Current
♦
2% Output Accuracy Over Load, Line, and Temperature
♦
Stable with Ceramic Capacitors
♦
Fast Transient Response
♦
♦
♦
♦
60µA Operating Bias Supply Current
1.2µA Shutdown Bias Supply Current
Short-Circuit and Thermal Protection
-40°C to +125°C Operating Temperature Range
MAX15029/MAX15030
♦
Soft-Start Limits Inrush Current
♦
Thermally Enhanced 3mm x 3mm TDFN Package
Ordering Information
PART
MAX15029ATB+
MAX15029ATB/V+
MAX15030ATB+
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
-40°C to +125°C 10 TDFN-EP* +AUF
-40°C to +125°C 10 TDFN-EP* +AXK
-40°C to +125°C 10 TDFN-EP* +AUG
MAX15029AGA/VY+
†
-40°C to +125°C 8 TDFN-EP** +ACQ
Applications
Automotive (Dead-Man LDO)
Servers
Storage
Networking
Base Stations
Optical Modules
ATE
/V denotes an automotive qualified part.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
For tape and reel orders, add a “T” after the “+.”
*EP
= Exposed pad.
**Exposed pad side-wettable flanked package.
†
Future product—contact factory for availability.
Pin Configurations
TOP VIEW
IN
IN
IN
I.C.
EN
1
2
3
4
5
+
10
9
OUT
OUT
GND
FB
SS
MAX15029
EP
8
7
6
Typical Operating Circuits appear at end of data sheet.
TDFN
(3mm x 3mm)
Pin Configurations continued at end of data sheet.
________________________________________________________________
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.
1.425V to 3.6V Input, 500mA Low-Dropout
Regulators with BIAS Input
MAX15029/MAX15030
ABSOLUTE MAXIMUM RATINGS
IN, FB, SS, I.C. to GND..........................................-0.3V to +4.0V
BIAS to GND.............................................................-0.3V to +6V
EN to GND ................-0.3V to the lower of (V
BIAS
+ 0.3V) or +6V
OUT to GND ................................................-0.3V to (V
IN
+ 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
TDFN (derate 24.4mW/°C above +70°C)....................1951mW
Operating Junction Temperature Range ...........-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TDFN
Junction-to-Ambient Thermal Resistance (θ
JA
) ............41°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ...................9°C/W
Side-Wettable TDFN
Junction-to-Ambient Thermal Resistance (θ
JA
) ............41°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ...................8°C/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1; V
IN
= 1.8V, V
OUT
= 1.2V, EN = IN for MAX15029, EN = BIAS for MAX15030, I
OUT
= 100mA, T
A
= T
J
= -40°C to
+125°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
IN
MAX15029
Input Voltage Range
V
IN
MAX15030
V
IN
rising
V
BIAS
= 3V to 5.5V
BIAS = IN
MAX15029
MAX15030
1.425
1.425
3.000
1.275
1.04
1.325
1.09
50
160
180
170
275
325
315
0.1
3
2.3
20
V
IN
= 0V, V
OUT
= 0V,
V
BIAS
= 3.3V
Input Supply Current in Shutdown
I
BIAS_SD
EN = GND
V
IN
= 3.3V, V
OUT
= 0V,
V
BIAS
= 3.3V
V
IN
= 3.3V, V
OUT
= 0V,
V
BIAS
= 5V
2.5
110
60
1.2
1.2
1.5
120
2
2
3
μA
I
OUT
= 2mA
I
BIAS
V
EN
= V
BIAS
410
560
470
5.5
5.5
2.7
μA
V
V
mV
μA
μA
3.600
3.600
3.600
1.375
1.14
V
mV
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Undervoltage Lockout
Undervoltage Lockout Hysteresis
V
UVLO
V
UVLO_HYST
I
OUT
= 2mA
V
IN
= 1.425V to 3.6V, V
OUT
= 1.2V,
I
OUT
= 1mA, V
BIAS
= 3.3V
V
IN
= 3.6V, V
OUT
= 3.3V, I
OUT
= 100mA
V
IN
= 3.3V, V
OUT
= 3.3V, I
OUT
= 500mA
V
EN
= 0V (T
A
= -40°C to +85°C)
Quiescent GND Current
I
GND
Input Supply Current in Shutdown
BIAS (MAX15030)
Input Voltage Range
Undervoltage Lockout
Undervoltage Lockout Hysteresis
Quiescent Input Supply Current
I
IN_SD
V
BIAS
V
BIAS_UVLO
V
BIAS
rising
2
_______________________________________________________________________________________
1.425V to 3.6V Input, 500mA Low-Dropout
Regulators with BIAS Input
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1; V
IN
= 1.8V, V
OUT
= 1.2V, EN = IN for MAX15029, EN = BIAS for MAX15030, I
OUT
= 100mA, T
A
= T
J
= -40°C to
+125°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
OUT
Output Voltage Range
Load Regulation
Line Regulation
Dropout Voltage (V
IN
- V
OUT
)
(Note 2)
Output Current Limit
FB
Threshold Accuracy
Input Current
EN/SOFT-START
Enable Input Threshold
(MAX15030)
Enable Input Threshold
(MAX15029)
Soft-Start Charging Current
Soft-Start Reference Voltage
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
T
J
rising
165
15
°C
°C
V
IH
V
IL
V
IH
V
IL
I
SS
V
SS
V
BIAS
= 5V
V
IN
= 1.8V
1.05
0.4
1.05
0.4
5
0.499
V
V
μA
V
V
FB
I
FB
V
OUT
= 1.125V to 3.3V, V
IN
= (V
OUT
+
0.3V) to 3.6V, I
OUT
= 1mA to 500mA
V
FB
= 0.488V
0.489
0.499
0.1
0.509
0.2
V
μA
V
OUT
I
OUT
= 1mA to 500mA
V
IN
= 1.425V to 3.6V, V
OUT
= 1.2V,
I
OUT
= 1mA
I
OUT
= 500mA, V
OUT
= 1.2V, V
IN
= 1.5V
V
DO
Side-wettable package, I
OUT
= 500mA,
V
OUT
= 1.2V, V
IN
= 1.5V
V
FB
= 300mV
Side-wettable package, V
FB
= 300mV
0.7
0.575
0.5
0.01
4
40
50
0.85
0.72
150
190
1.0
0.9
mV
3.3
V
mV/mA
mV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX15029/MAX15030
I
LIM
A
Note 2:
All devices are production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design
and characterization.
_______________________________________________________________________________________
3
1.425V to 3.6V Input, 500mA Low-Dropout
Regulators with BIAS Input
MAX15029/MAX15030
Typical Operating Characteristics
(Circuit of Figure 1, V
IN
= 1.8V, V
OUT
= 1.5V, I
OUT
= 500mA, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX15029 toc01
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
V
BIAS
= 3.3V
1.50
OUTPUT VOLTAGE (V)
1.49
1.48
1.47
1.46
1.45
MAX15029 toc02
INPUT CURRENT
vs. INPUT VOLTAGE
MAX15029 toc03
1.6
1.4
OUTPUT VOLTAGE (V)
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
I
OUT
= 0
V
BIAS
= 3.3V
1.51
1.4
1.2
INPUT CURRENT (mA)
1.0
0.8
0.6
0.4
0.2
0
V
BIAS
= 3.3V
I
OUT
= 0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
200
400
600
800
4.0
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
BIAS CURRENT
vs. BIAS VOLTAGE
MAX15029 toc04
BIAS CURRENT
vs. OUTPUT CURRENT
59
58
BIAS CURRENT (µA)
57
56
55
54
53
52
51
50
6
0
200
V
BIAS
= 3.3V
400
600
800
0.2
0
0
V
BIAS
= 5.5V
MAX15029 toc05
GROUND CURRENT
vs. OUTPUT CURRENT
V
BIAS
= 3.3V
1.2
GROUND CURRENT (mA)
1.0
0.8
0.6
0.4
MAX15029 toc06
70
60
BIAS CURRENT (µA)
50
40
30
20
10
0
1
2
3
4
5
BIAS VOLTAGE (V)
V
IN
= 1.8V
V
OUT
= 1.5V
I
OUT
= 0
60
1.4
100
200
300
400
500
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
DROPOUT VOLTAGE
vs. OUTPUT CURRENT
MAX15029 toc07
FEEDBACK VOLTAGE
vs. TEMPERATURE
MAX15029 toc08
90
80
DROPOUT VOLTAGE (mV)
70
60
50
40
30
20
10
0
0
200
400
600
V
OUT
= 1.5V
V
BIAS
= 3.3V
499.5
499.0
FEEDBACK VOLTAGE (mV)
I
OUT
= 0
498.5
498.0
497.5
497.0
496.5
I
OUT
= 500mA
-50
-25
0
25
50
75
100 125 150
800
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
1.425V to 3.6V Input, 500mA Low-Dropout
Regulators with BIAS Input
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 1.8V, V
OUT
= 1.5V, I
OUT
= 500mA, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX15029 toc09
MAX15029/MAX15030
OUTPUT VOLTAGE
vs. TEMPERATURE
1.53
1.52
OUTPUT VOLTAGE (V)
1.51
I
OUT
= 0
1.50
1.49
1.48
1.47
-50
-25
0
25
50
75
100 125 150
TEMPERATURE (°C)
I
OUT
= 500mA
1.6
1.4
OUTPUT VOLTAGE (V)
1.2
1.0
0.8
0.6
0.4
0.2
0
0
V
IN
= 1.8V
V
IN
= 1.2V
T
A
= +125°C
V
OUT
= 1.5V
200
400
600
800
OUTPUT CURRENT (mA)
CURRENT LIMIT
vs. TEMPERATURE
930
910
CURRENT LIMIT (mA)
890
870
850
830
810
790
770
750
-50
-25
0
25
50
75
100 125 150
TEMPERATURE (°C)
MAX15029 toc11
LOAD-TRANSIENT RESPONSE
MAX15029 toc12
950
I
OUT
20mA/div
0
MAX15029 toc10
V
OUT
10mV/div
AC-COUPLED
I
OUT
= 100mA TO 500mA TO 100mA
20μs/div
POWER-UP RESPONSE
MAX15029 toc13
POWER-DOWN RESPONSE
MAX15029 toc14
1V/div
V
OUT
0
V
OUT
1V/div
0
1V/div
V
IN
V
IN
I
OUT
= 500mA
2ms/div
0
I
OUT
= 500mA
20ms/div
2V/div
0
_______________________________________________________________________________________
5
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