Maxim MAX8640YEXT12+T Tiny 500ma, 4mhz/2mhz synchronous step-down dc-dc converter Datasheet

19-3997; Rev 2; 7/07
KIT
ATION
EVALU
LE
B
A
IL
A
AV
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
The MAX8640Y/MAX8640Z step-down converters are
optimized for applications where small size, high efficiency, and low output ripple are priorities. They utilize
a proprietary PWM control scheme that optimizes the
switching frequency for high efficiency with small external components and maintains low output ripple voltage at all loads. The MAX8640Z switches at up to
4MHz to allow a tiny 1µH inductor and 2.2µF output
capacitor. The MAX8640Y switches at up to 2MHz for
higher efficiency while still allowing small 2.2µH and
4.7µF components. Output current is guaranteed up to
500mA, while typical quiescent current is 24µA.
Factory-preset output voltages from 0.8V to 2.5V eliminate external feedback components.
Internal synchronous rectification greatly improves efficiency and replaces the external Schottky diode
required in conventional step-down converters. Internal
fast soft-start eliminates inrush current so as to reduce
input capacitor requirements.
The MAX8640Y/MAX8640Z are available in the tiny 6pin, SC70 (2.0mm x 2.1mm) and µDFN (1.5mm x
1.0mm) packages. Both packages are lead-free.
Applications
Microprocessor/DSP Core Power
I/O Power
Features
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
Tiny SC70 and µDFN Packages
500mA Guaranteed Output Current
4MHz or 2MHz PWM Switching Frequency
Tiny External Components: 1µH/2.2µF or
2.2µH/4.7µF
24µA Quiescent Current
Factory Preset Outputs from 0.8V to 2.5V
±1% Initial Accuracy
Low Output Ripple at All Loads
Ultrasonic Skip Mode Down to 1mA Loads
Ultra-Fast Line- and Load-Transient Response
Fast Soft-Start Eliminates Inrush Current
Ordering Information
PINPACKAGE
PKG
CODE
TOP
MARK
MAX8640YEXT08+T
6 SC70-6
X6S-1
ACQ
MAX8640YEXT11+T
6 SC70-6
X6S-1
ACR
MAX8640YEXT12+T
6 SC70-6
X6S-1
ACS
MAX8640YEXT13+T
6 SC70-6
X6S-1
ACG
MAX8640YEXT15+T
6 SC70-6
X6S-1
ADD
MAX8640YEXT16+T
6 SC70-6
X6S-1
ADB
MAX8640YEXT18+T
6 SC70-6
X6S-1
ACI
X6S-1
ACH
PART*
MAX8640YEXT19+T
Cell Phones, PDAs, DSCs, MP3s
Other Handhelds Where Space Is Limited
6 SC70-6
ACJ
MAX8640YEXT25+T 6 SC70-6
X6S-1
*Contact factory for availability of each version.
+Denotes a lead-free package.
T = Tape and reel.
Note: All devices are specified over the -40°C to +85°C
operating temperature range.
Ordering Information continued and Selector Guide appears
at end of data sheet.
Pin Configurations
Typical Operating Circuit
TOP VIEW
L1
1μH OR 2.2μH
INPUT
2.7V TO 4.9V
IN
C1
2.2μF
OUTPUT
0.8V TO 2.5V
UP TO 500mA
LX
1
GND
2
OUT
3
LX
MAX8640Y
+
+
MAX8640Y
MAX8640Z
6
IN
5
GND
4
SHDN
LX
1
GND
OUT
6
IN
2
5
GND
3
4
SHDN
MAX8640Y
GND MAX8640Z OUT
ON/OFF
SHDN
C2
2.2μF OR
4.7μF
SC70
2.0mm x 2.1mm
μDFN
1.5mm x 1.0mm
________________________________________________________________ Maxim Integrated Products
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.
1
MAX8640Y/MAX8640Z
General Description
MAX8640Y/MAX8640Z
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +6V
LX, OUT, SHDN to GND ..............................-0.3V to (VIN + 0.3V)
LX Current (Note 1) ........................................................0.8ARMS
OUTPUT Short Circuit to GND ...................................Continuous
Continuous Power Dissipation (TA = +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C) ..............245mW
6-Pin µDFN (derate 2.1mW/°C above +70°C) ..............167.7mW
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
Note 1: LX has internal clamp diodes to IN and GND. Applications that forward bias these diodes should not exceed the IC’s package
power-dissipation limit.
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 = 3.6V, SHDN = IN, TA = -40°C to +85°C, typical values are at TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
Supply Range
UVLO Threshold
SYMBOL
CONDITIONS
VIN
UVLO
MIN
VIN rising, 100mV hysteresis
2.44
No load, no switching
Supply Current
Output Voltage Range
ICC
VOUT
Output Voltage Accuracy
(Falling Edge)
Output Load Regulation
(Voltage Positioning)
TYP
MAX
UNITS
4.9
V
2.6
2.70
V
24
48
0.01
0.1
µA
2.5
V
2.7
SHDN = GND
TA = +25°C
TA = +85°C
0.1
Factory preset
0.8
ILOAD = 0mA, TA = +25°C
-1
ILOAD = 0mA, TA = -40°C to +85°C
-2
Equal to inductor DC resistance
0
+1
+2
RL
%
V/A
VIH
VIN = 2.7V to 4.9V
VIL
VIN = 2.7V to 4.9V
IIH,IL
VIN = 4.9V,
SHDN = GND or IN
Peak Current Limit
ILIMP
pFET switch
590
770
1400
mA
Valley Current Limit
ILIMN
nFET rectifier
450
650
1300
mA
ILXOFF
nFET rectifier
10
40
70
mA
RONP
pFET switch, ILX = -40mA
0.6
1.2
RONN
nFET rectifier, ILX = 40mA
0.35
0.7
ILXLKG
VIN = 4.9V, LX = GND
to IN, SHDN = GND
TA = +25°C
0.1
1
TA = +85°C
1
SHDN Logic Input Level
SHDN Logic Input Bias Current
Rectifier Off-Current Threshold
On-Resistance
LX Leakage Current
Minimum On and Off Times
Thermal Shutdown
Thermal-Shutdown Hysteresis
1.4
0.4
TA = +25°C
0.001
TA = +85°C
0.01
tON(MIN)
95
tOFF(MIN)
95
1
V
µA
Ω
µA
ns
+160
°C
20
°C
Note 2: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
2
_______________________________________________________________________________________
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8640YEXT18
30
SUPPLY CURRENT (μA)
80
70
60
50
40
30
20
25
20
MAX8640ZEXT15
15
10
10
MAX8640ZEXT15
1
MAX8640YEXT18
10
5
0
1
10
100
LOAD CURRENT (mA)
0.1
2.9
1000
3.3
3.7
4.1
SUPPLY VOLTAGE (V)
4.5
4.9
0
100
200
300
400
LOAD CURRENT (mA)
500
LIGHT-LOAD SWITCHING WAVEFORMS
(IOUT = 1mA)
OUTPUT VOLTAGE vs. LOAD CURRENT
(VOLTAGE POSITIONING)
MAX8640Y/Z toc05
1.55
MAX8640ZEXT15
1.50
MAX8640Y/Z toc04
0.1
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
35
MAX8640Y/Z toc03
MAX8640YEXT18
MAX8640Y/Z toc02
90
MAX8640Y/Z toc01
100
SWITCHING FREQUENCY
vs. LOAD CURRENT
SWITCHING FREQUENCY (MHz)
EFFICIENCY vs. LOAD CURRENT
1.8V OUTPUT
20mV/div
(AC-COUPLED)
VOUT
1.45
VLX
2V/div
1.40
1.35
ILX
200mA/div
1.30
0
100
200
300
400
LOAD CURRENT (mA)
500
10μs/div
MEDIUM-LOAD SWITCHING WAVEFORMS
(IOUT = 40mA)
HEAVY-LOAD SWITCHING WAVEFORMS
(IOUT = 300mA)
MAX8640Y/Z toc06
MAX8640Y/Z toc07
20mV/div
(AC-COUPLED)
VOUT
20mV/div
(AC-COUPLED)
VOUT
2V/div
VLX
VLX
0V
2V/div
0V
200mA/div
ILX
200mA/div
ILX
0mA
0mA
200ns/div
200ns/div
_______________________________________________________________________________________
3
MAX8640Y/MAX8640Z
Typical Operating Characteristics
(VIN = 3.6V, VOUT = 1.5V, MAX8640Z, L = Murata LQH32CN series, TA = +25°C, unless otherwise noted.)
MAX8640Y/MAX8640Z
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Typical Operating Characteristics (continued)
(VIN = 3.6V, VOUT = 1.5V, MAX8640Z, L = Murata LQH32CN series, TA = +25°C, unless otherwise noted.)
LIGHT-LOAD STARTUP WAVEFORM
(100Ω LOAD)
HEAVY-LOAD STARTUP WAVEFORM
(5Ω LOAD)
MAX8640Y/Z toc08
MAX8640Y/Z toc09
5V/div
VSHDN
5V/div
VSHDN
1V/div
1V/div
VOUT
0V
VOUT
0V
100mA/div
100mA/div
0mA
IIN
IIN
0mA
ILX
500mA/div
500mA/div
ILX
0mA
0mA
20μs/div
20μs/div
LOAD-TRANSIENT RESPONSE
(5mA TO 250mA TO 5mA)
LINE-TRANSIENT RESPONSE
(4V TO 3.5V TO 4V)
MAX8640Y/Z toc11
MAX8640Y/Z toc10
1V/div
4V
VIN
VOUT
50m/div
AC-COUPLED
VOUT
500mA/div
ILX
20mV/div
AC-COUPLED
200mA/div
IOUT
200mA/div
ILX
0mA
0mA
40μs/div
20μs/div
LOAD-TRANSIENT RESPONSE
(10mA TO 500mA TO 10mA)
MAX8640Y/Z toc12
100mV/div
AC-COUPLED
VOUT
500mA/div
ILX
0V
IOUT
200mA/div
40μs/div
4
_______________________________________________________________________________________
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
PIN
NAME
FUNCTION
Inductor Connection to the Internal Drains of the p-channel and n-channel MOSFETs. High impedance
during shutdown.
1
LX
2, 5
GND
Ground. Connect these pins together directly under the IC.
3
OUT
Output Sense Input. Bypass with a ceramic capacitor as close as possible to pin 3 (OUT) and pin 2 (GND).
OUT is internally connected to the internal feedback network.
4
SHDN
6
IN
Active-Low Shutdown Input. Connect to IN or logic-high for normal operation. Connect to GND or logic-low for
shutdown mode.
Supply Voltage Input. Input voltage range is 2.7V to 4.9V. Bypass with a ceramic capacitor as close as
possible to pin 6 (IN) and pin 5 (GND).
Detailed Description
The MAX8640Y/MAX8640Z step-down converters deliver over 500mA to outputs from 0.8V to 2.5V. They utilize
a proprietary hysteretic PWM control scheme that
switches at up to 4MHz (MAX8640Z) or 2MHz
(MAX8640Y), allowing some trade-off between efficiency and size of external components. At loads below
100mA, the MAX8640Y/MAX8640Z automatically switch
to pulse-skipping mode to minimize the typical quiescent current (24µA). Output ripple remains low at all
loads, while the skip-mode switching frequency
remains ultrasonic down to 1mA (typ) loads. Figure 1 is
the simplified functional diagram.
IN
SHDN
PWM
LOGIC
GND
OUT
0.6V
Control Scheme
A proprietary hysteretic PWM control scheme ensures
high efficiency, fast switching, fast transient response,
low output ripple, and physically tiny external components. This control scheme is simple: when the output
voltage is below the regulation threshold, the error
comparator begins a switching cycle by turning on the
high-side switch. This switch remains on until the minimum on-time expires and the output voltage is above
the regulation threshold or the inductor current is above
the current-limit threshold. Once off, the high-side
switch remains off until the minimum off-time expires
and the output voltage falls again below the regulation
threshold. During the off period, the low-side synchronous rectifier turns on and remains on until either the
high-side switch turns on again or the inductor current
approaches zero. The internal synchronous rectifier
eliminates the need for an external Schottky diode.
Voltage-Positioning Load Regulation
The MAX8640Y/MAX8640Z utilize a unique feedback
network. By taking DC feedback from the LX node, the
usual phase lag due to the output capacitor is
removed, making the loop exceedingly stable and
LX
MAX8640Y
MAX8640Z
Figure 1. Simplified Functional Diagram
allowing the use of very small ceramic output capacitors.
This configuration yields load regulation equal to the
inductor’s series resistance multiplied by the load current.
This voltage-positioning load regulation greatly reduces
overshoot during load transients, effectively halving the
peak-to-peak output-voltage excursions compared to traditional step-down converters. See the Load-Transient
Response in the Typical Operating Characteristics.
Shutdown Mode
Connecting SHDN to GND or logic low places the
MAX8640Y/MAX8640Z in shutdown mode and reduces
supply current to 0.1µA (typ). In shutdown, the control
circuitry and internal MOSFET switches turn off and LX
becomes high impedance. Connect SHDN to IN or
logic high for normal operation.
_______________________________________________________________________________________
5
MAX8640Y/MAX8640Z
Pin Description
MAX8640Y/MAX8640Z
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Soft-Start
The MAX8640Y/MAX8640Z are optimized for use with a
tiny inductor and small ceramic capacitors. The correct
selection of external components ensures high efficiency, low output ripple, and fast transient response.
It is acceptable to use a 1.5µH inductor with either the
MAX8640Y or MAX8640Z, but efficiency and ripple
should be verified. Similarly, it is acceptable to use a
3.3µH inductor with the MAX8640Y, but performance
should be verified.
For optimum voltage positioning of load transients,
choose an inductor with DC series resistance in the
75mΩ to 150mΩ range. For higher efficiency at heavy
loads (above 200mA) or minimal load regulation (but
some transient overshoot), the resistance should be
kept as low as possible. For light-load applications up
to 200mA, higher resistance is acceptable with very little impact on performance.
Inductor Selection
Capacitor Selection
The MAX8640Y/MAX8640Z include internal soft-start
circuitry that eliminates inrush current at startup, reducing transients on the input source. Soft-start is particularly useful for higher impedance input sources, such
as Li+ and alkaline cells. See the Soft-Start Response
in the Typical Operating Characteristics.
Applications Information
A 1µH inductor is recommended for use with the
MAX8640Z, and 2.2µH is recommended for the
MAX8640Y. A 1µH inductor is physically smaller but
requires faster switching, resulting in some efficiency
loss. Table 1 lists several recommended inductors.
Output Capacitor
The output capacitor, C2, is required to keep the output
voltage ripple small and to ensure regulation loop stability. C2 must have low impedance at the switching frequency. Ceramic capacitors are recommended due to
Table 1. Suggested Inductors
MANUFACTURER
FDK
Murata
Sumida
Taiyo Yuden
SERIES
INDUCTANCE
(µH)
DC RESISTANCE
(Ω typ)
MIPFT2520D
2.0
1.5
MIPF2520D
LQM31P
CDRH2D09
CKP3216T
GLF201208T
TDK
GLF2012T
GLF251812T
MDT2520-CR
TOKO
D2812C
6
CURRENT RATING
(mA)
DIMENSIONS
L x W x H (mm)
0.16
900
2.5 x 2.0 x 0.5
0.07
1500
2.2
0.08
1300
3.3
0.10
1200
1.0
0.12
1200
1.5
0.16
1000
2.2
0.22
900
1.2
0.08
590
1.5
0.09
520
2.2
0.12
440
1.0
0.11
1100
1.5
0.13
1000
2.2
0.14
900
1.0
0.15
460
2.2
0.36
300
1.0
0.07
400
2.2
0.10
300
1.0
0.10
800
2.2
0.20
600
1.0
0.05
1000
2.2
0.08
700
1.0
0.07
1100
2.2
0.14
770
2.5 x 2.0 x 1.0
3.2 x 1.6 x 0.95
3.0 x 3.0 x 1.0
3.2 x 1.6 x 0.9
2.0 x 1.25 x 0.9
2.0 x 1.25 x 1.35
_______________________________________________________________________________________
2.5 x 1.8 x 1.35
2.5 x 2.0 x 1.0
2.8 x 2.8 x 1.2
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Input Capacitor
The input capacitor, C1, reduces the current peaks
drawn from the battery or input power source and
reduces switching noise in the IC. The impedance of C1
at the switching frequency should be kept very low.
Ceramic capacitors are recommended due to their
small size and low ESR. Make sure the capacitor maintains its capacitance over temperature and DC bias.
Capacitors with X5R or X7R temperature characteristics
Selector Guide
PART
OUTPUT
VOLTAGE (V)
FREQUENCY
(MHz)
MAX8640YEXT08
0.8
MAX8640YEXT11
MAX8640YEXT12
RECOMMENDED COMPONENTS
TOP MARK
L1 (µH)
C2 (µF)
1.2
2.2
10
ACQ
1.1
1.7
2.2
4.7
ACR
1.2
1.8
2.2
4.7
ACS
ACG
MAX8640YEXT13
1.3
1.9
2.2
4.7
MAX8640YEXT15
1.5
2.0
2.2
4.7
ADD
MAX8640YEXT16
1.6
2.0
2.2
4.7
ADB
MAX8640YEXT18
1.8
2.0
2.2
4.7
ACI
MAX8640YEXT19
1.9
2.0
2.2
4.7
ACH
MAX8640YEXT25
MAX8640YELT08
2.5
0.8
1.7
1.2
2.2
2.2
4.7
10
ACJ
NB
MAX8640YELT11
1.1
1.7
2.2
4.7
NC
MAX8640YELT12
1.2
1.8
2.2
4.7
ND
MAX8640YELT13
1.3
1.9
2.2
4.7
NE
MAX8640YELT15
1.5
2.0
2.2
4.7
NF
MAX8640YELT16
1.6
2.0
2.2
4.7
NG
MAX8640YELT18
1.8
2.0
2.2
4.7
NH
MAX8640YELT19
1.9
2.0
2.2
4.7
NI
MAX8640YELT25
2.5
1.7
2.2
4.7
NJ
MAX8640ZEXT08
0.8
2.4
1
4.7
ACL
MAX8640ZEXT11
1.1
3.4
1
2.2
ACM
MAX8640ZEXT12
1.2
3.6
1
2.2
ACN
MAX8640ZEXT13
1.3
3.7
1
2.2
ACO
MAX8640ZEXT15
1.5
3.9
1
2.2
ACP
ACU
MAX8640ZEXT18
1.8
4.0
1
2.2
MAX8640ZELT08
0.8
2.4
1
4.7
NK
MAX8640ZELT11
1.1
3.4
1
2.2
NL
NM
MAX8640ZELT12
1.2
3.6
1
2.2
MAX8640ZELT13
1.3
3.7
1
2.2
NN
MAX8640ZELT15
1.5
3.9
1
2.2
NO
MAX8640ZELT18
1.8
4.0
1
2.2
NP
_______________________________________________________________________________________
7
MAX8640Y/MAX8640Z
their small size and low ESR. Make sure the capacitor
maintains its capacitance over temperature and DC
bias. Capacitors with X5R or X7R temperature characteristics typically perform well. The output capacitance
can be very low; see the Selector Guide for recommended capacitance values. For optimum load-transient performance and very low output ripple, the output
capacitor value in µF should be equal to or larger than
the inductor value in µH.
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
MAX8640Y/MAX8640Z
Ordering Information (continued)
typically perform well. Due to the MAX8640Y/
MAX8640Z soft-start, the input capacitance can be very
low. For optimum noise immunity and low input ripple,
choose a capacitor value in µF that is equal to or larger
than the inductor’s value in µH.
PINPACKAGE
PKG
CODE
MAX8640YELT08+T
6 µDFN-6
L611-1
NB
MAX8640YELT11+T
6 µDFN-6
L611-1
NC
PCB Layout and Routing
MAX8640YELT12+T
6 µDFN-6
L611-1
ND
MAX8640YELT13+T
6 µDFN-6
L611-1
NE
MAX8640YELT15+T
6 µDFN-6
L611-1
NF
MAX8640YELT16+T
6 µDFN-6
L611-1
NG
MAX8640YELT18+T
6 µDFN-6
L611-1
NH
MAX8640YELT19+T
6 µDFN-6
L611-1
NI
High switching frequencies and large peak currents
make PCB layout a very important part of design. Good
design minimizes excessive EMI on the feedback paths
and voltage gradients in the ground plane, both of
which can result in instability or regulation errors.
Connect the inductor, input capacitor, and output
capacitor as close together as possible, and keep their
traces short, direct, and wide. Connect the two GND
pins under the IC and directly to the grounds of the
input and output capacitors. Keep noisy traces, such
as the LX node, as short as possible. Refer to the
MAX8640Z evaluation kit for an example PCB layout
and routing scheme.
PART*
TOP
MARK
MAX8640YELT25+T
6 µDFN-6
L611-1
NJ
MAX8640ZEXT08+T
6 SC70-6
X6S-1
ACL
MAX8640ZEXT11+T
6 SC70-6
X6S-1
ACM
MAX8640ZEXT12+T
6 SC70-6
X6S-1
ACN
MAX8640ZEXT13+T
6 SC70-6
X6S-1
ACO
MAX8640ZEXT15+T
6 SC70-6
X6S-1
ACP
MAX8640ZEXT18+T
6 SC70-6
X6S-1
ACU
MAX8640ZELT08+T
6 µDFN-6
L611-1
NK
MAX8640ZELT11+T
6 µDFN-6
L611-1
NL
MAX8640ZELT12+T
6 µDFN-6
L611-1
NM
MAX8640ZELT13+T
6 µDFN-6
L611-1
NN
MAX8640ZELT15+T
6 µDFN-6
L611-1
NO
MAX8640ZELT18+T
6 µDFN-6
L611-1
NP
Chip Information
PROCESS: BiCMOS
*Contact factory for availability of each version.
+Denotes a lead-free package.
T = Tape and reel.
Note: All devices are specified over the -40°C to +85°C
operating temperature range.
8
_______________________________________________________________________________________
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
SC70, 6L.EPS
PACKAGE OUTLINE, 6L SC70
21-0077
F
1
1
_______________________________________________________________________________________
9
MAX8640Y/MAX8640Z
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
TOPMARK
3
2
5
e
A
4
b
5
4
AA
PIN 1
MARK
6L UDFN.EPS
MAX8640Y/MAX8640Z
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
6
PIN 1
0.075x45∞
L
E
1
A2
D
A1
TOP VIEW
3
2
A
L1
SIDE VIEW
A
1
L2
BOTTOM 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
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
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
DOCUMENT CONTROL NO.
21-0147
-DRAWING NOT TO SCALE-
REV.
E
2
2
Revision History
Pages changed at Rev 1: All
Pages changed at Rev 2: 1, 7, 8–11
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
MAX8640Y/MAX8640Z
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
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