MAX15101 Small 1A, Low-Dropout Linear
EVALUATION KIT AVAILABLE
MAX15101
Small 1A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
General Description
Features
The MAX15101 is a small, low-dropout linear regulator
optimized for networking, datacom, and server applications. The regulator delivers up to 1A from a 1.7V to 5.5V
input supply with output accuracy of ±1.6%. The output
is adjustable down to 0.6V with a guaranteed dropout
voltage of less than 100mV at full load. The internal
p-channel switch is protected with a foldback current limit
and thermal shutdown.
●● 1.7V to 5.5V Operating Range
●● 100mV Dropout Guaranteed at 1A
●● ±1.6% Output Accuracy Over Line, Load, and
Temperature
●● Adjustable Output from 0.6V to 5.2V
●● Foldback Current Protection
●● Thermal Shutdown Protection
The MAX15101 features an external bypass input to
reduce noise. This bypass input also serves as a softstart control. An enable input and power-good output are
included for power sequence control.
●● Low Noise 15μVRMS (typ)
●● Small 1.6mm x 2.7mm WLP Package
The MAX15101 is available in a 1.6mm x 2.7mm WLP
package and is fully specified from the -40°C to +85°C
operating temperature range.
Applications
●●
●●
●●
●●
●●
Ordering Information appears at end of data sheet.
Networking
Telecom/Datacom
Servers
Base Stations
PLL Power
Typical Operating Circuit
INPUT
(1.7V TO 5.5V)
OUT
IN
CIN
2.2µF
OUTPUT
(0.6V TO VIN - 200mV)
MAX15101
R1
0 TO 4.6kΩ
EN
PG
FB
POWER-GOOD
OUTPUT
GND
SS_BYP
CSS
100nF
19-6154; Rev 1; 8/16
R2
600Ω
COUT
10µF
MAX15101
Small 1A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Absolute Maximum Ratings
IN, SS_BYP, FB to GND..........................................-0.3V to +6V
EN, PG, OUT to GND.................................-0.3V to (VIN + 0.3V)
OUT Short Circuit.......................................................Continuous
Continuous Power Dissipation (TA = +70°C)
WLP (derate 19.2mW/°C above +70°C).....................1538mW
Operating Temperature Range............................ -40°C to +85°C
Storage Temperature Range............................. -65°C to +150°C
Junction Temperature.......................................................+150°C
Soldering Temperature (reflow) (Note 1).......................... +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.
Note 1: The WLP package is constructed using a unique set of package techniques that impose a limit on the thermal profile. The
device can be exposed during board-level solder attach and rework. This limit permits only the use of the solder profiles
recommended in the industry-standard specification JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.
Preheating is required. Hand or wave soldering is not allowed.
Package Thermal Characteristics (Note 2)
WLP
Junction-to-Ambient Thermal Resistance (θJA)...........30°C/W
Note 2: 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.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(VIN = 3.3V, VOUT = 1.5V, VEN = VIN, IOUT = 100mA, CIN = 2.2μF, COUT = 22μF, TA = TJ = -40°C to +85°C, typical values are at
TA = +25°C, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
5.5
V
1.624
1.69
V
IN
Input Voltage Range
VIN
Input Undervoltage Lockout
VIN_UV
Input Undervoltage Lockout
Hysteresis
VIN_UV_HYS
1.7
VIN rising
40
mV
OUT
Output Voltage Range
VOUT
0.6
5.2
Load Regulation
IOUT = 30mA to 1A
Line Regulation
VIN = 1.7V to 5.5V, VOUT = 0.6V,
IOUT = 190mA
Dropout Voltage
IOUT = 1A, VFB = 580mV (Note 4)
25
In-Regulation Current Limit
VIN = 5.5V, VFB = 500mV
1.62
A
Short-Circuit Foldback Current
Limit
VIN = 5.5V, VOUT = 0V, VFB < 100mV
1
A
Output Shutdown Leakage
VIN = 5.5V, VOUT = 0V, VEN = 0V
Line Transient
∆VIN = 0.5V, tRISE = tFALL = 5µs
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0.1
V
-0.15
%/A
+0.15
%/V
100
mV
4
2
µA
%
Maxim Integrated │ 2
MAX15101
Small 1A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Electrical Characteristics (continued)
(VIN = 3.3V, VOUT = 1.5V, VEN = VIN, IOUT = 100mA, CIN = 2.2μF, COUT = 22μF, TA = TJ = -40°C to +85°C, typical values are at
TA = +25°C, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Load Transient
IOUT = 100mA to 1A to 100mA,
tRISE = tFALL = 1µs
1.3
%
Power-Supply Rejection
Frequency = 100kHz, IOUT = 500mA
40
dB
Output Voltage Noise
Frequency = 500Hz to 100kHz,
IOUT = 100mA
15
µVRMS
FB
FB Threshold Accuracy
FB Input Current
IOUT = 190mA, VOUT = 1.5V to 5V,
VIN = (VOUT + 0.3V) to 5.5V
593
IOUT = 3mA to 1A, VOUT = 1.5V to 5V,
VIN = (VOUT + 0.3V) to 5.5V
590
600
606
mV
610
VFB = 0.6V, VIN = 5.5V
1
µA
3.5
mA
1
µA
GND
Ground Supply Current
1.8
Ground Shutdown Current
VIN = 1.7V to 5.5V
POWER-GOOD OUTPUT
Power-Good (PG) Threshold
VFB moving out of
regulation, VHYS = 15mV
Power-Good (PG) OutputVoltage Low
IPG = 2mA (sink)
FB = high
638
650
662
FB = low
538
550
562
25
80
Power-Good (PG) Delay
100
Power-Good (PG) Leakage
VPG = 5.5V
mV
mV
µs
1
µA
ENABLE
Enable Input High Threshold
VEN_HIGH
Enable Input Low Threshold
VEN_LOW
Enable Input Bias Current
1.2
VEN = 0 to 5.5V
V
0.4
V
+1
µA
9.2
12
µA
45
100
Ω
-1
SOFT-START
Soft-Start Charging Current
VSS_BYP = 100mV
Soft-Start Pulldown Resistance
VEN = 0V, ISS_BYP = 2mA
8
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Threshold falling
+160
°C
15
°C
Note 3: All devices 100% production tested at TA = +25°C. Limits over the temperature range are guaranteed by design.
Note 4: Dropout is defined as VIN - VOUT when VOUT falls 3% below its nominal voltage value.
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Maxim Integrated │ 3
MAX15101
Small 1A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Typical Operating Characteristics
(VIN = 1.8V, VOUT = 1.5V, TA = +25°C, unless otherwise noted.)
VOUT = 2.5V
20
VOUT = 1.8V
10
VOUT = 3.3V
0.05
VOUT = 3V
0
VOUT = 2.5V
VOUT = 1.5V
-0.05
1.515
0
0.2
0.4
0.6
0.8
0
1.500
1.495
0.2
0.4
0.6
1.485
1.0
0.8
1.8
2.3
2.8
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
3.8
4.8
5.3
NO LOAD
MAX15101 toc04
MAX15101 toc05
1.496
CSS =100nF
VEN
1V/div
IIN
1.492
1.490
2A/div
1A LOAD
VOUT
1V/div
1.488
1.486
VPG
1V/div
1.484
1.482
4.3
STARTUP WAVEFORMS
1.498
1.494
3.3
INPUT VOLTAGE (V)
OUTPUT VOLTAGE
vs. TEMPERATURE
OUTPUT VOLTAGE (V)
1.505
1.490
-0.10
1.0
IOUT = 0.5A
1.510
VOUT = 5V
0
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX15101 toc03
0.10
OUTPUT VOLTAGE (V)
30
OUTPUT VOLTAGE ERROR
vs. OUTPUT CURRENT
MAX15101 toc02
DEFINED VIN - VOUT WHEN VOUT FALLS 2%
BELOW NOMINAL
OUTPUT VOLTAGE ERROR (%)
DROPOUT VOLTAGE (mV)
40
MAX15101 toc01
DROPOUT VOLTAGE
vs. OUTPUT CURRENT
-40
-15
10
35
60
85
1ms/div
TEMPERATURE (°C)
9
8
7
0.599
6
5
4
3
0.597
0.596
0.594
0.593
1
0.592
5
25
45
65
CAPACITOR VALUE (nF)
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85
100
1A LOAD
0.595
2
0
NO LOAD
0.598
FB VOLTAGE (V)
SOFT-START TIME (ms)
0.600
MAX15101 toc06
10
FB VOLTAGE vs. TEMPERATURE
(VOUT = 1.5V)
MAX15101 toc07
SOFT-START TIME
vs. CAPACITOR VALUE
0.591
-40
-15
10
35
60
85
TEMPERATURE (°C)
Maxim Integrated │ 4
MAX15101
Small 1A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Typical Operating Characteristics (continued)
(VIN = 1.8V, VOUT = 1.5V, TA = +25°C, unless otherwise noted.)
1A LOAD-TRANSIENT RESPONSE
(COUT = 10µF)
LINE-TRANSIENT RESPONSE
MAX15101 toc08
MAX15101 toc09
ILOAD = 1A
2.3V
VOUT
AC-COUPLED
50mV/div
1A
VIN
200mV/div
1.8V
IOUT
500mA/div
VOUT
AC-COUPLED
20mV/div
100mA
40µs/div
100µs/div
FOLDBACK CURRENT-LIMIT
WAVEFORMS
GROUND CURRENT
vs. INPUT VOLTAGE
MAX15101 toc10
IOUT
2A/div
2.5
GROUND CURRENT (mA)
VOUT
500mV/div
MAX15101 toc11
3.0
2.0
ILOAD = 1A
1.5
1.0
ILOAD = 0A
0.5
0
100µs/div
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
VIN
2V/div
VOUT
1V/div
VPG
1V/div
18
80
NOISE DENSITY (µVRMS)
IOUT
2A/div
NOISE DENSITY
(ILOAD = 100mA)
90
70
PSRR (dB)
MAX15101 toc12
1.8V
MAX15101 toc13
60
50
40
30
20
MAX15101 toc14
PSRR vs. FREQUENCY
(ILOAD = 0.5A)
SHORT-CIRCUIT WAVEFORMS
NO CSS
15
CSS = 4.7nF
12
9
CSS = 100nF
6
10
200µs/div
10Hz
100kHz
FREQUENCY
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1MHz
3
100
1k
10k
100k
FREQUENCY (Hz)
Maxim Integrated │ 5
MAX15101
Small 1A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Bump Configuration
TOP VIEW
MAX15101
1
2
3
4
5
EN
PG
GND
SS_BYP
FB
IN
IN
IN
IN
IN
OUT
OUT
OUT
OUT
OUT
+
A
B
C
WLP
Bump Description
BUMP
NAME
A1
EN
Active-High Enable Input. Drive EN logic-high to enable the LDO. Connect to IN for always-on
operation.
A2
PG
Power-Good Output. Open-drain output asserts high when the voltage is within regulation.
A3
GND
A4
SS_BYP
A5
FB
Feedback Input. Connect a resistive divider from OUT to GND to set the output voltage.
B1, B2, B3,
B4, B5
IN
Supply Voltage Input. Connect to supply voltage from 1.7V to 5.5V. Bypass IN to GND with a 2.2µF
or greater ceramic capacitor.
C1, C2, C3,
C4, C5
OUT
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FUNCTION
Ground
SS_BYP Bypass/Soft-Start Input. Connect a ceramic capacitor from SS_BYP to GND to reduce the
output noise and set the soft-start ramp time.
Regulated Output. Connect a 10µF capacitor from OUT to GND. For better load transient
performance a larger capacitor can be used.
Maxim Integrated │ 6
MAX15101
Small 1A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Functional Diagram
SS_BYP
IN
UNDERVOLTAGE
LOCKOUT
THERMALOVERLOAD
PROTECTION
0.60V
REF
EN
SHUTDOWN
LOGIC
0.55V
gM
ERROR
AMPLIFIER
P
0.65V
ILIM
OUT
FB
GND
PG
MAX15101
PG
CIRCUITRY
Detailed Description
The MAX15101 is a small, low-dropout linear regulator
optimized for server, network, and telecom applications.
The regulator delivers up to 1A from a 1.7V to 5.5V
input supply with output accuracy of ±1.6%. The output
is adjustable down to 0.6V with a guaranteed dropout
voltage of less than 100mV at full load. The internal
p-channel switch is protected with a foldback current limit
and thermal shutdown.
The MAX15101 features an external bypass input to
reduce noise. This bypass input also serves as a softstart control. An enable input and power-good output are
included for power sequence control.
Internal p-Channel Pass Transistor
The MAX15101 features a 1A p-channel MOSFET pass
transistor. Unlike similar designs with pnp pass transistors, the gate-drive current to the p-channel power transistor is extremely low. PNP-based regulators also waste
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N
considerable current in dropout when the pass transistor
saturates and uses high base-drive currents under large
loads. The MAX15101 does not suffer from these deficiencies and consumes only 1.8mA of quiescent current
even in dropout.
Output Voltage Selection
The MAX15101 features an adjustable output. The output
voltage can be set between +0.6V to VIN - 200mV using
an external resistive voltage-divider to FB (see the Typical
Operating Characteristics). The output voltage is set
using the following equation:
VOUT = VFB (1 + R1/R2)
where VFB = +600mV.
To simplify resistor selection:
R1 = R2 (VOUT/VFB - 1)
Set R2 to 600Ω.
Maxim Integrated │ 7
MAX15101
Enable
A logic-low on EN disables the MAX15101. In shutdown,
the pass transistor, control circuitry, reference, and all
biases are turned off, reducing supply current to typically
1µA. Connect EN to IN for normal operation. In shutdown,
the soft-start capacitor is discharged using an internal
pulldown resistance.
Soft-Start
As shown in the Typical Operating Characteristics, the
MAX15101 uses a gM stage and integrating capacitor
CSS to control the regulator’s feedback set point. When
EN is driven low, the soft-start capacitor is discharged.
When EN is driven high or power is applied to the device,
a constant 9.2µA current charges the soft-start capacitor.
At startup, the feedback set point increases linearly, which
reduces the inrush supply current.
tSS = 6.315 x 10-5 x CSS
where CSS is in nF. Use capacitor values between 30nF
to 100nF with voltage ratings greater than 5V.
Because this ramp is applied to the current-limit comparator, the actual time for the output voltage to ramp up
depends on the load current and output capacitor. Leave
SS_BYP unconnected to disable soft-start.
Foldback Current Limiting
The MAX15101 features a 1.6A current limit when the
output voltage is in regulation. When the voltage at the
output drops to 17% of its nominal value, the current limit
exponentially folds back to 1A. The output can be shorted
to ground for an indefinite period of time without damag
ing the device. Avoid continuous output current of greater
than 1A to prevent damage to the regulator.
Small 1A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Operating Region and Power Dissipation
The power dissipation across the device is P = IOUT
(VIN - VOUT). The resulting maximum power dissipation is:
PMAX = [(TJ(MAX) - TA)/(θJA)]
where (TJ(MAX) - TA) is the temperature difference
between the maximum allowed die junction (+150°C) and
the surrounding air. Figure 1 shows the allowable power
dissipation for typical PCBs at +25°C, +50°C, and +70°C
ambient temperatures (refer to the MAX15101 EV kit).
Applications Information
Capacitor Selection and Regulator Stability
Capacitors are required at the MAX15101’s input and
output. Connect at least a 2.2µF capacitor between IN
and GND (CIN) and a 10µF capacitor between OUT and
GND (COUT). Use only surface-mount ceramic capacitors
that have low equivalent series resistance (ESR). Make
the input and output traces at least 2.5mm wide, and connect CIN and COUT within 6mm of the IC to minimize the
impact of PCB trace inductance.
The output capacitor’s ESR can affect stability and output
noise. Use capacitors with 50mΩ or less ESR to ensure
stability and optimum transient response. This is particularly true in applications with very low output voltage
(< 2V) and high output current (> 0.5A).
Since some capacitor dielectrics can vary over bias voltage and temperature, consult the capacitor manufacturer
specifications to ensure that the capacitors meet these
requirements over all combinations of operating voltage
and temperature.
Thermal-overload protection is designed to safeguard the
MAX15101 in the event of fault conditions. For continuous
operation, do not exceed the junction temperature rating
of TJ = +125°C.
MAXIMUM OUTPUT CURRENT (A)
Thermal-Overload Protection
A thermal-overload circuit limits total power dissipation in
the MAX15101. When the junction temperature exceeds
TJ = +160°C, the thermal sensor turns off the pass transistor, allowing the IC to cool. The thermal sensor turns
the pass transistor on once the IC’s junction temperature
drops approximately 15°C. Continuous short-circuit conditions will consequently result in a foldback limited output.
MAXIMUM CONTINUOUS CURRENT
1.25
1.00
TA = +25°C
0.75
TA = +70°C
TA = +50°C
0.50
0.25
0
TJ = +125°C (BASED ON MAX15101 EV KIT)
0
1
2
3
4
5
INPUT-OUTPUT DIFFERENTIAL VOLTAGE (V)
Figure 1. Maximum Output Current Curves
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Maxim Integrated │ 8
MAX15101
Input-Output (Dropout) Voltage
A regulator’s minimum input-to-output voltage differential
(dropout voltage) determines the lowest usable supply
voltage. The dropout voltage is simply the product of
regulator’s RDS(ON) for the pass device and rated load
current. The MAX15101’s RDS(ON) is 20mΩ, at 1A this
yields a dropout voltage of 20mV (see the Electrical
Characteristics and the Dropout Voltage vs. Output
Current graph in the Typical Operating Characteristics).
Noise, PSRR, and Transient Response
The MAX15101 is designed to achieve low dropout voltage while still maintaining good noise, transient response,
and AC rejection. When operating from very noisy sources, supply noise rejection and transient response can
be improved by increasing the values of the input and
output capacitors. The MAX15101 output noise is typically
15µVRMS (see the Noise Density graph in the Typical
Operating Characteristics).
Thermal Considerations
in PCB Layout
The rated package dissipation strongly depends on the
copper area connected to the regulator. The maximum
power dissipation allowed in the package is 1538mW
(measured from the MAX15101 EV kit).
Small 1A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX15101EWL+
-40°C to +85°C
15 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
15 WLP
W151B2+1
21-0205
Refer to
Application
Note 1891
More power dissipation can be handled by the package if
great attention is given during PCB layout. For example,
using the top and bottom copper as a heatsink and
connecting the thermal vias to one of the middle layers
(GND) transfers the heat from the package into the board
more efficiently, resulting in lower junction temperature at
high power dissipation in some MAX15101 applications.
Furthermore, the solder mask around the IC area on both
top and bottom layers can be removed to radiate the heat
directly into the air. The maximum allowable power dissipation in the IC is as follows:
PMAX = [(TJ(MAX) - TA)/(θJA)]
where (TJ(MAX) - TA) is the temperature difference
between the maximum-allowed die junction (+150°C) and
the surrounding air.
A sample layout is available on the MAX15101 EV kit.
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Maxim Integrated │ 9
MAX15101
Small 1A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Revision History
REVISION
NUMBER
REVISION
DATE
0
12/11
Initial release
—
1
8/16
Updated Absolute Maximum Ratings section
2
DESCRIPTION
PAGES
CHANGED
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2016 Maxim Integrated Products, Inc. │ 10
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