Maxim MAX15104EWL+ Small 2a, low-dropout linear regulator in a 2.7mm x 1.6mm package Datasheet

19-6266; Rev 0; 4/12
EVALUATION KIT AVAILABLE
MAX15104
Small 2A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
General Description
Features
The MAX15104 is a small, low-dropout linear regulator
optimized for networking, datacom, and server applications. The regulator delivers up to 2A from a 1.7V to 5.5V
input supply with output accuracy of Q1.6%. The output
is adjustable down to 0.6V with a guaranteed dropout
voltage of less than 150mV at full load. The internal
p-channel switch is protected with a foldback current
limit and thermal shutdown.
S 1.7V to 5.5V Operating Range
The MAX15104 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.
S Foldback Current Protection
The MAX15104 is available in a 1.6mm x 2.7mm WLP
package and is fully specified from the -40NC to +85NC
operating temperature range.
S Small 1.6mm x 2.7mm WLP Package
Applications
S 150mV Dropout Guaranteed at 2A
S ±1.6% Output Accuracy Over Line, Load, and
Temperature
S 70dB PSRR At 500kHz
S Adjustable Output from 0.6V to 5.2V
S Thermal Shutdown Protection
S Low Noise 15µVRMS (typ)
Ordering Information appears at end of data sheet.
Networking
Telecom/Datacom
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX15104.related.
Servers
Base Stations
PLL Power
Typical Operating Circuit
INPUT
(1.7V TO 5.5V)
OUT
IN
MAX15104
CIN
2.2µF
R1
0 TO 4.6kI
EN
PG
OUTPUT
(0.6V TO VIN - 200mV)
COUT
22µF
FB
POWER-GOOD
OUTPUT
GND
SS_BYP
R2
600I
CSS
100nF
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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.
MAX15104
Small 2A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
ABSOLUTE MAXIMUM RATINGS
IN, EN, PG, SS_BYP, FB to GND ............................-0.3V to +6V
OUT to GND................................................-0.3V to (VIN + 0.3V)
OUT Short Circuit.......................................................Continuous
Continuous Power Dissipation (TA = +70NC)
WLP (derate 19.2mW/NC above +70NC).....................1538mW
Operating Temperature Range ......................... -40NC to +85NC
Storage Temperature Range .......................... -65NC to +150NC
Junction Temperature .....................................................+150NC
Soldering Temperature (reflow) (Note 1).........................+260NC
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.
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 2)
WLP
Junction-to-Ambient Thermal Resistance (qJA)...........30°C/W
Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(VIN = 3.3V, VOUT = 1.5V, VEN = VIN, IOUT = 100mA, CIN = 2.2µF, COUT = 22µF, TA = TJ = -40NC to +85NC, typical values are at
TA = +25NC, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
5.5
V
2.099
V
IN
Input Voltage Range
VIN
Input Undervoltage Lockout
VIN_UV
Input Undervoltage Lockout
Hysteresis
VIN_UV_HYS
1.7
VIN rising
2.03
70
mV
OUT
Output Voltage Range
VOUT
0.6
5.2
0.1
V
Load Regulation
IOUT = 30mA to 2A
Line Regulation
VIN = 1.7V to 5.5V, VOUT = 0.6V,
IOUT = 190mA
Dropout Voltage
IOUT = 2A, VFB = 580mV (Note 4)
50
In-Regulation Current Limit
VIN = 5.5V, VFB = 500mV
2.5
A
Short-Circuit Foldback Current
Limit
VIN = 5.5V, VOUT = 0V, VFB < 100mV
1.4
A
Output Shutdown Leakage
VIN = 5.5V, VOUT = 0V, VEN = 0V
Line Transient
DVIN = 0.5V, tRISE = tFALL = 5Fs
-0.15
%/A
+0.15
%/V
150
mV
5
2
FA
%
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MAX15104
Small 2A, 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 = -40NC to +85NC, typical values are at
TA = +25NC, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Load Transient
IOUT = 100mA to 1A to 100mA,
tRISE = tFALL = 1Fs
1.3
%
Power-Supply Rejection
Frequency = 500kHz, IOUT = 500mA
70
dB
Output Voltage Noise
Frequency = 500Hz to 100kHz,
IOUT = 100mA
15
FVRMS
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 2A, VOUT = 1.5V to 5V,
VIN = (VOUT + 0.3V) to 5.5V
590
600
606
mV
610
VFB = 0.6V, VIN = 5.5V
1
FA
3.5
mA
1
FA
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
mV
1
FA
Power-Good (PG) Delay
100
Power-Good (PG) Leakage
VPG = 5.5V
mV
Fs
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
FA
9.2
12
FA
45
100
I
-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
NC
15
NC
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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MAX15104
Small 2A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Typical Operating Characteristics
(VIN = 1.8V, VOUT = 1.5V, TA = +25NC, unless otherwise noted.)
VOUT = 2.5V
30
VOUT = 1.8V
20
VOUT = 3.3V
10
0
0.5
VOUT = 3V
0
VOUT = 1.5V V
OUT = 2.5V
-0.05
1.5
1.505
1.500
1.495
1.485
-0.10
1.0
2.0
0
0.5
1.0
1.5
2.0
2.5
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
OUTPUT VOLTAGE
vs. TEMPERATURE
STARTUP WAVEFORMS
1.8
3.0
MAX15104 toc04
1.498
1.496
NO LOAD
1V/div
1.494
IIN
2A/div
1.490
VOUT
1V/div
1A LOAD 2A LOAD
1.486
VPG
1.484
1V/div
1.482
3.3
3.8
4.3
4.8
10
9
VEN
1.488
2.8
5.3
SOFT-START TIME
vs. CAPACITOR VALUE
CSS =100nF
1.492
2.3
INPUT VOLTAGE (V)
MAX15104 toc05
1.500
8
7
6
5
4
3
2
1
0
1.480
-15
10
35
60
85
5
1ms/div
25
45
65
85
100
CAPACITOR VALUE (nF)
TEMPERATURE (°C)
FB VOLTAGE vs. TEMPERATURE
(VOUT = 1.5V)
0.600
0.599
NO LOAD
0.598
1A LOAD-TRANSIENT RESPONSE
MAX15104 toc08
MAX15104 toc07
-40
FB VOLTAGE (V)
OUTPUT VOLTAGE (V)
1.510
1.490
VOUT = 5V
0
0.05
IOUT = 0.5A
MAX15104 toc06
40
1.515
OUTPUT VOLTAGE (V)
50
0.10
MAX15104 toc02
60
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
SOFT-START TIME (ms)
DROPOUT VOLTAGE (mV)
MAX15104 toc01
DEFINED VIN - VOUT WHEN VOUT
FALLS 2% BELOW NOMINAL
70
OUTPUT VOLTAGE ERROR (%)
80
OUTPUT VOLTAGE ERROR
vs. OUTPUT CURRENT
MAX15104 toc03
DROPOUT VOLTAGE
vs. OUTPUT CURRENT
VOUT
AC-COUPLED
50mV/div
1A LOAD
0.597
0.596
0.595
2A LOAD
1A
0.594
IOUT
500mA/div
0.593
100mA
0.592
0.591
-40
-15
10
35
60
85
40µs/div
TEMPERATURE (°C)
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MAX15104
Small 2A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Typical Operating Characteristics (continued)
(VIN = 1.8V, VOUT = 1.5V, TA = +25NC, unless otherwise noted.)
2A LOAD-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE
MAX15104 toc10
MAX15104 toc09
ILOAD = 1A
2.3V
VOUT
AC-COUPLED
50mV/div
VIN
200mV/div
1.8V
2A
VOUT
AC-COUPLED
20mV/div
IOUT
1A/div
100mA
100µs/div
40µs/div
GROUND CURRENT
vs. INPUT VOLTAGE
FOLDBACK CURRENT-LIMIT WAVEFORMS
MAX15104 toc11
MAX15104 toc12
3.0
2.5
GROUND CURRENT (mA)
VOUT
500mV/div
IOUT
2A/div
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)
VPG
2V/div
200µs/div
PSRR (dB)
IOUT
5A/div
80
70
60
50
40
PSRR (0A LOAD)
PSRR (10mA LOAD)
PSRR (100mA LOAD)
PSRR (500mA LOAD)
30
20
10
100
1k
10k
CSS = 4.7nF
12
9
CSS = 100nF
6
3
0
10
NO CSS
15
NOISE DENSITY (µVRMS)
100
90
VOUT
1V/div
18
MAX15104 toc14
120
110
VIN
2V/div
MAX15104 toc15
MAX15104 toc13
1.8V
NOISE DENSITY
(ILOAD = 100mA)
PSRR vs. FREQUENCY
SHORT-CIRCUIT WAVEFORMS
100k
FREQUENCY (Hz)
1M
10M
100
1k
10k
100k
FREQUENCY (Hz)
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MAX15104
Small 2A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Bump Configuration
TOP VIEW
MAX15104
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
FUNCTION
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 2.2FF
or greater ceramic capacitor.
C1, C2, C3,
C4, C5
OUT
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 22FF capacitor from OUT to GND. For better load transient
performance a larger capacitor can be used.
����������������������������������������������������������������� Maxim Integrated Products 6
MAX15104
Small 2A, 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
0.55V
gM
ERROR
AMPLIFIER
P
0.65V
SHUTDOWN
LOGIC
ILIM
OUT
FB
GND
PG
MAX15104
PG
CIRCUITRY
Detailed Description
The MAX15104 is a small, low-dropout linear regulator
optimized for server, network, and telecom applications.
The regulator delivers up to 3A from a 1.7V to 5.5V input
supply with output accuracy of Q1.6%. The output is
adjustable down to 0.6V with a guaranteed dropout voltage of less than 150mV at full load. The internal p-channel switch is protected with a foldback current limit and
thermal shutdown.
The MAX15104 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 MAX15104 features a 2A p-channel MOSFET pass
transistor. Unlike similar designs with pnp pass transistors,
the gate-drive current to the p-channel power transistor is
N
extremely low. PNP-based regulators also waste considerable current in dropout when the pass transistor saturates
and uses high base-drive currents under large loads. The
MAX15104 does not suffer from these deficiencies and
consumes only 1.8mA of quiescent current even in dropout.
Output Voltage Selection
The MAX15104 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 Circuit). 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 600I.
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MAX15104
Small 2A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Enable
A logic-low on EN disables the MAX15104. In shutdown,
the pass transistor, control circuitry, reference, and all
biases are turned off, reducing supply current to typically
1FA. 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 Circuit, the MAX15104
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
9.2FA 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 MAX15104 features a 2.5A 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 1.4A. The output can be
shorted to ground for an indefinite period of time without
damaging the device. Avoid continuous output current of
greater than 2A to prevent damage to the regulator.
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)/(BJA)]
where (TJ(MAX) - TA) is the temperature difference
between the maximum allowed die junction (+150NC) and
the surrounding air. Figure 1 shows the allowable power
dissipation for typical PCBs at +25NC, +50NC, and +70NC
ambient temperatures (refer to the MAX15104 EV kit).
Applications Information
Capacitor Selection and Regulator Stability
Capacitors are required at the MAX15104’s input and
output. Connect at least a 2.2FF capacitor between IN
and GND (CIN) and a 22FF capacitor between OUT and
GND (COUT). 10µF can be used for lower current operation (1A for example). 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 50mI 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
Thermal-overload protection is designed to safeguard
the MAX15104 in the event of fault conditions. For continuous operation, do not exceed the junction temperature
rating of TJ = +125NC.
2.5
MAXIMUM OUTPUT CURRENT (A)
A thermal-overload circuit limits total power dissipation in
the MAX15104. When the junction temperature exceeds
TJ = +160NC, 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 15NC. Continuous short-circuit conditions will consequently result in a foldback limited output.
2.0
TA = +25NC
1.5
1.0
TA = +50NC
0.5
TA = +70NC
TJ = +125NC (BASED ON MAX15102 EV KIT)
0
0
1
2
3
4
5
INPUT-OUTPUT DIFFERENTIAL VOLTAGE (V)
Figure 1. Maximum Output Current Curves
����������������������������������������������������������������� Maxim Integrated Products 8
MAX15104
Small 2A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
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 MAX15104‘s RDS(ON) is 25mI, at 2A this
yields a dropout voltage of 50mV (see the Electrical
Characteristics and the Dropout Voltage vs. Output
Current graph in the Typical Operating Characteristics).
Noise, PSRR, and Transient Response
The MAX15104 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 MAX15104 output
noise is typically 15FVRMS (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 MAX15104 EV kit).
Ordering Information
PART
MAX15104EWL+
TEMP RANGE
PIN-PACKAGE
-40NC to +85NC
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.maxim-ic.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 MAX15104 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)/(BJA)]
where (TJ(MAX) - TA) is the temperature difference
between the maximum-allowed die junction (+150NC)
and the surrounding air.
A sample layout is available on the MAX15104 EV kit.
����������������������������������������������������������������� Maxim Integrated Products 9
MAX15104
Small 2A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Revision History
REVISION
NUMBER
REVISION
DATE
0
4/12
DESCRIPTION
Initial release
PAGES
CHANGED
—
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim 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 Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
©
2012 Maxim Integrated Products
10
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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