MAX8840/MAX8841/
MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
General Description
The MAX8840/MAX8841/MAX8842 ultra-low-noise, lowdropout (LDO) linear regulators are designed to deliver
up to 150mA continuous output current. These regulators achieve a low 120mV dropout for 120mA load current. The MAX8840 uses an advanced architecture to
achieve ultra-low output voltage noise of 11µVRMS and
PSRR of 54dB at 100kHz.
The MAX8841 does not require a bypass capacitor,
hence achieving the smallest PC board area. The
MAX8842 output voltage can be adjusted with an external divider.
The MAX8840/MAX8841 are preset to a variety of voltages in the 1.5V to 4.5V range. Designed with a p-channel
MOSFET series pass transistor, the MAX8840/MAX8841/
MAX8842 maintain very low ground current (40µA).
The regulators are designed and optimized to work with
low-value, low-cost ceramic capacitors. The MAX8840
requires only 1µF (typ) of output capacitance for stability
with any load. When disabled, current consumption drops
to below 1µA.
The MAX8840/MAX8841/MAX8842 are available in a tiny
1.0mm x 1.5mm x 0.8mm µDFN.
Applications
Cellular and Cordless Phones
PDA and Palmtop Computers
Base Stations
Bluetooth Portable Radios and Accessories
Wireless LANs
Digital Cameras
Personal Stereos
Portable and Battery-Powered Equipment
Features
o Space-Saving 1.0mm x 1.5mm x 0.8mm µDFN
o 11µVRMS Output Noise at 100Hz to 100kHz
Bandwidth (MAX8840)
o 78dB PSRR at 1kHz (MAX8840)
o 120mV Dropout at 120mA Load
o Stable with 1µF Ceramic Capacitor for Any Load
o Guaranteed 150mA Output
o Only Need Input and Output Capacitors (MAX8841)
o Output Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V,
2.85V, 3V, 3.3V, 4.5V (MAX8840/MAX8841) and
Adjustable (MAX8842)
o Low 40µA Ground Current
o Excellent Load/Line Transient
o Overcurrent and Thermal Protection
Ordering Information
PART*
TEMP RANGE
PIN-PACKAGE
MAX8840ELTxy+T
-40°C to +85°C
6 µDFN-6
1.5mm x 1.0mm
MAX8841ELTxy+T
-40°C to +85°C
6 µDFN-6
1.5mm x 1.0mm
MAX8842ELT+T
-40°C to +85°C
6 µDFN-6
1.5mm x 1.0mm
*xy is the output voltage code (see the Output Voltage Selector
Guide). Other versions between 1.5V and 4.5V are available in
100mV increments. Contact factory for other versions.
+Denotes lead-free package.
Output Voltage Selector Guide appears at end of data sheet.
Typical Operating Circuits
Pin Configuration
TOP VIEW
INPUT
2V TO 6V
CIN
1µF
ON
OFF
IN
OUT
OUTPUT PRESET
1.5V TO 4.5V
MAX8840
GND 2
BP
SHDN
GND
COUT
1µF
Typical Operating Circuits continued at end of data sheet.
6 OUT
IN 1
CBP
10nF
MAX8840
MAX8841
MAX8842
SHDN 3
5 N.C.
BP (MAX8840)
4 N.C. (MAX8841)
FB (MAX8842)
µDFN
(1.5mm x 1.0mm)
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-0629; Rev 1; 1/07
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
ABSOLUTE MAXIMUM RATINGS
θJA ..................................................................................477°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
IN to GND .................................................................-0.3V to +7V
Output Short-Circuit Duration ............................................Infinite
OUT, SHDN to GND ......................................-0.3V to (IN + 0.3V)
FB, BP, N.C. to GND..................................-0.3V to (OUT + 0.3V)
Continuous Power Dissipation (TA = +70°C)
6-Pin µDFN (derate 2.1mW/°C above +70°C) .............0.168W
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
(VIN = VOUT + 0.5V, TA = -40°C to +85°C, unless otherwise noted. CIN = 1µF, COUT = 1µF, CBP = 10nF. Typical values are at +25°C;
the MAX8842 is tested with 2.45V output, unless otherwise noted.) (Note 1)
PARAMETER
Input Voltage Range
SYMBOL
CONDITIONS
VIN
Output Voltage Accuracy
IOUT
Current Limit
ILIM
Dropout Voltage (Note 2)
TYP
MAX
UNITS
V
2
6
IOUT = 1mA, TA = +25°C
-1
+1
IOUT = 100µA to 80mA, TA = +25°C
-2
+2
-3
+3
IOUT = 100µA to 80mA
Maximum Output Current
MIN
150
OUT = 90% of nominal value
150
%
mA
200
300
VOUT ≥ 3V, IOUT = 80mA
80
170
VOUT ≥ 3V, IOUT = 120mA
120
2.5V ≤ VOUT < 3V, IOUT = 80mA
90
2.5V ≤ VOUT < 3V, IOUT = 120mA
135
2V ≤ VOUT < 2.5V, IOUT = 80mA
120
2V ≤ VOUT < 2.5V, IOUT = 120mA
180
200
mA
mV
250
IOUT = 0.05mA
40
90
VIN = VOUT(nom) - 0.1V, IOUT = 0mA
220
500
Ground Current
IQ
Line Regulation
VLNR
VIN = (VOUT + 0.5V) to 6V, IOUT = 0.1mA
0.001
%/V
Load Regulation
VLDR
IOUT = 1mA to 80mA
0.003
%/mA
Shutdown Supply Current
ISHDN
SHDN = 0V
f = 1kHz, IOUT = 10mA
Ripple Rejection
PSRR
f = 10kHz, IOUT = 10mA
f = 100kHz, IOUT = 10mA
2
TA = +25°C
0.003
TA = +85°C
0.05
MAX8840
78
MAX8841/MAX8842
72
MAX8840
75
MAX8841/MAX8842
65
MAX8840
54
MAX8841/ MAX8842
46
1
µA
µA
dB
Maxim Integrated
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VOUT + 0.5V, TA = -40°C to +85°C, unless otherwise noted. CIN = 1µF, COUT = 1µF, CBP = 10nF. Typical values are at +25°C;
the MAX8842 is tested with 2.45V output, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Output Noise Voltage
(RMS)
MIN
TYP
f = 100Hz to 100kHz,
ILOAD = 10mA
MAX8840
11
MAX8841/MAX8842
230
f = 100Hz to 100kHz,
ILOAD = 80mA
MAX8840
13
MAX8841/MAX8842
230
MAX
UNITS
µV
Shutdown Exit Delay
RLOAD = 50Ω (Note 3)
300
µs
SHDN Logic-Low Level
VIN = 2V to 6V
0.4
V
SHDN Logic-High Level
VIN = 2V to 6V
SHDN Input Bias Current
VIN = 6V, SHDN = 0V or
6V
FB Input Bias Current
(MAX8842)
VIN = 6V, VFB = 1.3V
1.5
V
TA = +25°C
TA = +85°C
0.01
TA = +25°C
0.006
TA = +85°C
0.01
µA
0.1
µA
Thermal Shutdown
160
°C
Thermal-Shutdown
Hysteresis
10
°C
Note 1: Limits are 100% tested at +25°C. Limits over operating temperature range are guaranteed by design.
Note 2: Dropout is defined as VIN - VOUT when VOUT is 100mV below the value of VOUT for VIN = VOUT + 0.5V.
Note 3: Time needed for VOUT to reach 90% of final value.
Typical Operating Characteristics
(VIN = VOUT + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 10nF, TA = +25°C, unless otherwise noted.)
MAX8840
OUTPUT VOLTAGE ACCURACY
vs. LOAD CURRENT
% DEVIATION (%)
0.4
2.0
1.5
IOUT = 150mA
1.0
0.2
0
-0.2
0.5
-0.4
0.0
-0.6
0.8
IOUT = 1mA
0.6
% DEVIATION (%)
IOUT = 0mA
2.5
1.0
MAX8840 toc02
3.0
OUTPUT VOLTAGE (V)
0.6
MAX8840 toc01
3.5
MAX8840
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
MAX8840 toc03
MAX8840
OUTPUT VOLTAGE vs. INPUT VOLTAGE
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
0
1
2
3
4
INPUT VOLTAGE (V)
Maxim Integrated
5
6
-1.0
0
25
50
75
100
LOAD CURRENT (mA)
125
150
-40
-15
10
35
60
85
TEMPERATURE (°C)
3
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
Typical Operating Characteristics (continued)
(VIN = VOUT + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 10nF, TA = +25°C, unless otherwise noted.)
TA = +85°C
120
100
TA = -40°C
80
60
200
150
100
MAX8840
GROUND PIN CURRENT vs. INPUT VOLTAGE
350
300
GROUND PIN CURRENT (μA)
140
MAX8840 toc05
TA = +25°C
IOUT = 80mA
DROPOUT VOLTAGE (mV)
0
0
0
25
50
75
100
125
2.2
2.4
2.6
2.8
3.0
3.2
0
1
2
3
OUTPUT (V)
INPUT VOLTAGE (V)
MAX8840
GROUND PIN CURRENT vs. LOAD CURRENT
MAX8840
GROUND PIN CURRENT vs. TEMPERATURE
MAX8840
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
200
VIN = 3.8V
150
100
MAX8840 toc08
90
80
70
45
60
PSRR (dB)
250
GROUND PIN CURRENT (μA)
MAX8840 toc 07
VIN = 5.5V
50
40
50
40
30
35
20
50
ILOAD = 10mA
CBP = 10nF
10
0
30
25
50
75
100
125
150
0
-40
-15
10
35
60
85
0.01
0.1
1
10
100
1000
LOAD CURRENT (mA)
TEMPERATURE (°C)
FREQUENCY (kHz)
MAX8841
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8840
OUTPUT NOISE
MAX8840
OUTPUT NOISE-SPECTRAL DENSITY
vs. FREQUENCY
MAX8840 toc11
80
MAX8840 toc12
10,000
MAX8840 toc10
90
VIN = 3.8V
ILOAD = 10mA
VNOISE = 11μVRMS
70
60
50
20μV/div
40
30
20
OUTPUT NOISE DENSITY (nV/√Hz)
0
5
4
INPUT VOLTAGE (V)
300
GROUND PIN CURRENT (μA)
ILOAD = 0mA
100
0
2.0
150
350
PSRR (dB)
150
50
20
1000
100
ILOAD = 10mA
0
0.01
0.1
1
10
FREQUENCY (kHz)
4
200
50
40
10
ILOAD = 150mA
250
MAX8840 toc09
DROPOUT VOLTAGE (mV)
180
160
250
MAX8840 toc04
200
MAX8840
DROPOUT VOLTAGE vs. OUTPUT VOLTAGE
MAX8840 toc06
MAX8440
DROPOUT VOLTAGE vs. LOAD CURRENT
100
1000
400μs/div
10
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
Maxim Integrated
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
Typical Operating Characteristics (continued)
(VIN = VOUT + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 10nF, TA = +25°C, unless otherwise noted.)
MAX8840 toc15
MAX8840 toc14
MAX8840 toc13
25
20
OUTPUT NOISE (μV)
MAX8840
LOAD-TRANSIENT RESPONSE NEAR DROPOUT
MAX8840
LOAD-TRANSIENT RESPONSE
MAX8840
OUTPUT NOISE vs. BP CAPACITANCE
VIN = 3.1V
ILOAD = 0 TO 50mA
VIN = 3.5V
ILOAD = 0 TO 50mA
15
10
VOUT
10mV/div
VOUT
10mV/div
5
0
10
1
1ms/div
1ms/div
100
BP CAPACITANCE (nF)
MAX8840
EXITING SHUTDOWN WAVEFORM
MAX8840
LINE-TRANSIENT RESPONSE
MAX8840
ENTERING SHUTDOWN DELAY
MAX8840 toc17
MAX8840 toc16
VOUT = 2.85V
RLOAD = 47Ω
VIN = 3.5V TO 4V
MAX8840 toc18
CBP = 0.01μF
SHUTDOWN
VOLTAGE
SHUTDOWN
VOLTAGE
OUTPUT
VOLTAGE
2V/div
VOUT
2mV/div
OUTPUT
VOLTAGE
2V/div
20μs/div
200μs/div
40μs/div
MAX8840
REGION OF STABLE COUT ESR
vs. LOAD CURRENT
MAX8840
SHUTDOWN EXIT DELAY
MAX8840 toc19
100
VOUT
1V/div
10
COUT ESR (Ω)
SHUTDOWN
VOLTAGE
MAX8840 toc20
VOUT = 3V
CBP = 100nF
1
0.1
0.01
20μs/div
0
25
50
75
100
125
150
LOAD CURRENT (mA)
Maxim Integrated
5
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
Pin Description
PIN
MAX8842
NAME
FUNCTION
MAX8840
MAX8841
1
1
1
IN
2
2
2
GND
Ground
3
3
3
SHDN
Shutdown. Pull low to disable the regulator.
4
—
—
BP
Noise Bypass for Low-Noise Operation. Connect a 10nF capacitor
from BP to OUT. It is shorted to OUT in shutdown mode.
—
—
4
FB
Adjustable Output Feedback Point
5
4, 5
5
N.C.
No Connection. Not internally connected.
6
6
6
OUT
Regulated Output Voltage. Bypass with a capacitor to GND. See the
Capacitor Selection and Regulator Stability section.
Unregulated Input Supply
Detailed Description
The MAX8840/MAX8841/MAX8842 are ultra-low-noise,
low-dropout, low-quiescent current linear regulators
designed for space-restricted applications. The parts
are available with preset output voltages ranging from
1.5V to 4.5V. These devices can supply loads up to
150mA. As shown in the Functional Diagram , the
MAX8840/MAX8841 consist of an innovative bandgap
core and noise bypass circuit, error amplifier, p-channel pass transistor, and internal feedback voltagedivider. The MAX8842 allows for adjustable output with
an external feedback network.
The 1.225V bandgap reference is connected to the
error amplifier’s inverting input. The error amplifier compares this reference with the feedback voltage and
amplifies the difference. If the feedback voltage is
lower than the reference voltage, the pass-transistor
gate is pulled low. This allows more current to pass to
the output and increases the output voltage. If the feedback voltage is too high, the pass transistor gate is
pulled high, allowing less current to pass to the output.
The output voltage is fed back through an internal resistor voltage-divider connected to the OUT pin.
An external bypass capacitor connected to BP
(MAX8840) reduces noise at the output. Additional
blocks include a current limiter, thermal sensor, and
shutdown logic.
reduces quiescent current. pnp-based regulators waste
considerable current in dropout when the pass transistor saturates. They also use high base-drive current
under heavy loads. The MAX8840/MAX8841/MAX8842
do not suffer from these problems and consume only
40µA of quiescent current in light load and 220µA in
dropout (see the Typical Operating Characteristics).
Output Voltage Selection
The MAX8840/MAX8841 are supplied with factory-set
output voltages from 1.5V to 4.5V, in 100mV increments
(see the Ordering Information). The MAX8842 features
a user-adjustable output through an external feedback
network (see the Typical Operating Circuits).
To set the output of the MAX8842, use the following
equation:
⎛ VOUT ⎞
R1 = R2 X ⎜
- 1⎟
⎝ VREF ⎠
where R2 is chosen to be less than 240kΩ and VREF =
1.225V. Use 1% or better resistors.
Shutdown
Internal p-Channel Pass Transistor
The MAX8840/MAX8841/MAX8842 feature a low-power
shutdown mode that reduces quiescent current less
than 1µA. Driving SHDN low disables the voltage reference, error amplifier, gate-drive circuitry, and pass
transistor (see the Functional Diagram), and the device
output enters a high-impedance state. Connect SHDN
to IN for normal operation.
The MAX8840/MAX8841/MAX8842 feature a 1Ω (typ)
p-channel MOSFET pass transistor. This provides several advantages over similar designs using a pnp pass
transistor, including longer battery life. The p-channel
MOSFET requires no base drive, which considerably
The MAX8840/MAX8841/MAX8842 include a current
limiter, which monitors and controls the pass transistor’s gate voltage, limiting the output current to 200mA.
6
Current Limit
Maxim Integrated
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
For design purposes, consider the current limit to be
150mA (min) to 300mA (max). The output can be shorted
to ground for an indefinite amount of time without damaging the part.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation
in the MAX8840/MAX8841/MAX8842. When the junction
temperature exceeds TJ = +160°C, the thermal sensor
signals the shutdown logic, turning off the pass transistor
and allowing the IC to cool down. The thermal sensor
turns the pass transistor on again after the IC’s junction
temperature drops by 10°C, resulting in a pulsed output
during continuous thermal-overload conditions.
Thermal-overload protection is designed to protect the
MAX8840/MAX8841/MAX8842 in the event of a fault
condition. For continual operation, do not exceed the
absolute maximum junction temperature rating of TJ =
+150°C.
Operating Region and Power Dissipation
The MAX8840/MAX8841/MAX8842 maximum power
dissipation depends on the thermal resistance of the
case and circuit board, the temperature difference
between the die junction and ambient, and the rate of
airflow. The power dissipation across the device is:
P = IOUT (VIN - VOUT)
The maximum power dissipation is:
PMAX = (TJ - TA) / (θJC + θCA)
where TJ - TA is the temperature difference between
the MAX8840/MAX8841/MAX8842 die junction and the
surrounding air, θJC is the thermal resistance of the
package, and θCA is the thermal resistance through the
PC board, copper traces, and other materials to the
surrounding air.
The GND pin of the MAX8840/MAX8841/MAX8842 performs the dual function of providing an electrical connection to ground and channeling heat away. Connect
the GND pin to ground using a large pad or ground
plane.
Applications Information
Capacitor Selection
and Regulator Stability
Use a 1µF capacitor on the MAX8840/MAX8841/
MAX8842 input and a 1µF capacitor on the output.
Larger input capacitor values and lower ESRs provide
better noise rejection and line-transient response.
Reduce output noise and improve load-transient
response, stability, and power-supply rejection by
using large output capacitors. Note that some ceramic
dielectrics exhibit large capacitance and ESR variation
with temperature. With dielectrics such as Z5U and
Y5V, it may be necessary to use a 2.2µF or larger output
capacitor to ensure stability at temperatures below
-10°C. With X7R or X5R dielectrics, 1µF is sufficient at all
operating temperatures. A graph of the Region of Stable
COUT ESR vs. Load Current is shown in the Typical
Operating Characteristics.
Use a 0.01µF bypass capacitor at BP (MAX8840) for
low-output voltage noise. The leakage current going into
the BP pin should be less than 10nA. Increasing the
capacitance slightly decreases the output noise. Values
above 0.1µF and below 0.001µF are not recommended.
Noise, PSRR, and Transient Response
The MAX8840/MAX8841/MAX8842 are designed to
deliver ultra-low noise and high PSRR, as well as low
dropout and low quiescent currents in battery-powered
systems. The MAX8840 power-supply rejection is 78dB
at 1kHz and 54dB at 100kHz. The MAX8841/MAX8842
PSRR is 72dB at 1kHz and 46dB at 100kHz (see the
Power-Supply Rejection Ratio vs. Frequency graph in
the Typical Operating Characteristics).
When operating from sources other than batteries,
improved supply-noise rejection and transient response
can be achieved by increasing the values of the input
and output bypass capacitors, and through passive filtering techniques. The Typical Operating Characteristics
show the MAX8840/MAX8841/MAX8842 line- and loadtransient responses.
Noise Reduction
Dropout Voltage
For the MAX8840, an external 0.01µF bypass capacitor
between BP and OUT with an innovative noise bypass
scheme reduces output noises dramatically, exhibiting
11µVRMS of output voltage noise with CBP = 0.01µF
and COUT = 1µF. Startup time is minimized by a poweron circuit that precharges the bypass capacitor.
A regulator’s minimum dropout voltage determines the
lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX8840/MAX8841/MAX8842 use a
p-channel MOSFET pass transistor, their dropout voltage
is a function of drain-to-source on-resistance (RDS(ON))
multiplied by the load current (see the Typical Operating Characteristics).
Maxim Integrated
7
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
Functional Diagram
IN
SHDN
SHUTDOWN AND
POWER-ON CONTROL
MAX8840
MAX8841
MAX8842
ERROR
AMP
MOS DRIVER
WITH ILIMIT
P
OUT
**
THERMAL
SENSOR
1.225V REFERENCE
AND NOISE BYPASS
FB***
**
GND
*MAX8840 ONLY
**MAX8840/MAX8841 ONLY
***MAX8842 ONLY
8
BP*
Maxim Integrated
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
Typical Operating
Circuits (continued)
INPUT
2V TO 6V
IN
OUT
CIN
1µF
ON
OFF
OUTPUT PRESET
1.5V TO 4.5V
MAX8841
SHDN
COUT
1µF
GND
INPUT
2V TO 6V
CIN
1µF
ON
OFF
IN
OUT
MAX8842
OUTPUT ADJUSTABLE
1.5V TO 4.5V
R1
FB
SHDN
GND
COUT
1µF
R2
Output Voltage Selector Guide
PART
VOUT (V)
TOPMARK
MAX8840ELT16+T
1.6
MN
MAX8840ELT18+T
1.8
MO
MAX8840ELT19+T
1.9
LX
MAX8840ELT25+T
2.5
MP
MAX8840ELT26+T
2.6
MK
MAX8840ELT27+T
2.7
LU
MAX8840ELT28+T
2.8
LV
MAX8840ELT29+T
2.85
LW
MAX8840ELT30+T
3
LZ
MAX8840ELT31+T
3.1
ML
MAX8840ELT33+T
3.3
MM
MAX8841ELT15+T
1.5
MQ
MAX8841ELT18+T
1.8
MR
MAX8841ELT25+T
2.5
MS
MAX8841ELT26+T
2.6
MT
MAX8841ELT28+T
2.8
MU
MAX8841ELT29+T
2.85
MV
MAX8841ELT89+T
2.9
MW
MAX8841ELT31+T
3.1
MX
MAX8841ELT33+T
3.3
MY
MAX8841ELT45+T
4.5
MZ
MAX8842ELT+T
Adjustable
NA
(Note: Standard output voltage options, shown in bold, are
available. Contact the factory for other output voltages between
1.5V and 4.5V. Minimum order quantity is 15,000 units.)
Chip Information
TRANSISTOR COUNT: 284
PROCESS: BiCMOS
Maxim Integrated
Revision History
Pages changed at Rev 1: 1
9
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
Package Information
TOPMARK
3
2
5
e
A
4
b
5
4
AA
PIN 1
MARK
6L UDFN.EPS
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.
6
PIN 1
0.075x45∞
L
E
1
A2
D
A1
TOP VIEW
3
2
A
L1
A
1
L2
BOTTOM VIEW
SIDE VIEW
COMMON DIMENSIONS
b
SECTION A-A
MIN.
0.65
-0.00
1.45
0.95
0.30
0.00
0.05
0.17
A
A1
A2
D
E
L
L1
L2
b
e
Pkg.
Code
NOM.
0.72
0.20
-1.50
1.00
0.35
--0.20
0.50 BSC.
MAX.
0.80
-0.05
1.55
1.05
0.40
0.08
0.10
0.23
L611-1, L611-2
TITLE:
PACKAGE OUTLINE, 6L uDFN, 1.5x1.0x0.8mm
APPROVAL
-DRAWING NOT TO SCALE-
10
DOCUMENT CONTROL NO.
21-0147
REV.
E
1
2
Maxim Integrated
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
Package Information (continued)
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.
Translation Table for Calendar Year Code
TABLE 1
Calendar Year
Legend:
2005
2006
Marked with bar
2007
2008
2009
2010
2011
2012
2013
42-47
48-51
52-05
2014
Blank space - no bar required
Translation Table for Payweek Binary Coding
TABLE 2
Payweek
Legend:
06-11
12-17
Marked with bar
18-23
24-29
30-35
36-41
Blank space - no bar required
TITLE:
PACKAGE OUTLINE, 6L uDFN, 1.5x1.0x0.8mm
APPROVAL
-DRAWING NOT TO SCALE-
DOCUMENT CONTROL NO.
21-0147
REV.
E
2
2
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 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 ________________________________ 11
© 2007 Maxim Integrated Products, Inc.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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