MAX8640YEXT19-T [MAXIM]
Switching Regulator/Controller, Voltage-mode, 2000kHz Switching Freq-Max, BICMOS, PDSO6;
| 型号： | MAX8640YEXT19-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Switching Regulator/Controller, Voltage-mode, 2000kHz Switching Freq-Max, BICMOS, PDSO6 信息通信管理 光电二极管 |
| 文件： | 总12页 (文件大小：453K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3997; Rev 4; 2/09
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Y/MAX8640Z
General Description
Features
♦ Tiny SC70 and µDFN Packages
The MAX8640Y/MAX8640Z step-down converters are
optimized for applications where small size, high effi-
ciency, and low output ripple are priorities. They utilize
a proprietary PWM control scheme that optimizes the
switching frequency for high efficiency with small exter-
nal components and maintains low output ripple volt-
age 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 28µA.
Factory-preset output voltages from 0.8V to 2.5V elimi-
nate external feedback components.
♦ 500mA Guaranteed Output Current
♦ 4MHz or 2MHz PWM Switching Frequency
♦ Tiny External Components: 1µH/2.2µF or
2.2µH/4.7µF
♦ 28µA 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
Internal synchronous rectification greatly improves effi-
ciency 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.
PIN-
PACKAGE
PART*
TOP MARK
MAX8640YEXT08+T
MAX8640YEXT10+T
MAX8640YEXT11+T
MAX8640YEXT12+T
MAX8640YEXT13+T
MAX8640YEXT15+T
MAX8640YEXT16+T
MAX8640YEXT18+T
MAX8640YEXT19+T
MAX8640YEXT82+T
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
ACQ
ADF
ACR
ACS
ACG
ADD
ADB
ACI
The MAX8640Y/MAX8640Z are available in the tiny 6-
pin, 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
ACH
Cell Phones, PDAs, DSCs, MP3s
Other Handhelds Where Space Is Limited
ADJ
*Contact factory for availability of each version. For 2.85V output
(82 version), request application note that includes limitations
and typical operating characteristics.
+Denotes a lead(Pb)-free/RoHS-compliant 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
OUTPUT
L1
1μH OR 2.2μH
+
+
INPUT
0.8V TO 2.5V
UP TO 500mA
2.7V TO 5.5V
IN
IN
6
LX
1
2
3
6
5
4
1
LX
IN
LX
C1
2.2μF
MAX8640Y
MAX8640Z
MAX8640Y
MAX8640Z
GND
GND
OUT
2
3
5
4
MAX8640Y
MAX8640Z
GND
GND
OUT
GND
OUT
C2
2.2μF OR
4.7μF
SHDN
SHDN
SHDN
ON/OFF
SC70
μDFN
2.0mm x 2.1mm
1.5mm x 1.0mm
________________________________________________________________ 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.
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
ABSOLUTE MAXIMUM RATINGS
IN to GND.................................................................-0.3V to +6V
6-Pin µDFN (derate 2.1mW/°C above +70°C) ..............167.7mW
OUT, SHDN to GND ....................................-0.3V to (V + 0.3V)
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
LX Current (Note 1) ........................................................0.8A
RMS
OUTPUT Short Circuit to GND ...................................Continuous
Continuous Power Dissipation (T = +70°C)
A
6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
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
(V = 3.6V, SHDN = IN, T = -40°C to +85°C, typical values are at T = +25°C, unless otherwise noted.) (Note 2)
IN
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
2.7
TYP
MAX UNITS
Supply Range
V
5.5
2.70
48
V
V
IN
UVLO Threshold
UVLO
V
rising, 100mV hysteresis
2.44
2.6
28
IN
No load, no switching
Y/MAX8640Z
Supply Current
I
µA
T
T
= +25°C
= +85°C
0.01
0.1
0.1
CC
A
SHDN = GND
A
Output Voltage Range
V
Factory preset
0.8
-1
2.5
+1
+2
V
OUT
I
= 0mA, T = +25°C
0
LOAD
LOAD
A
Output Voltage Accuracy
(Falling Edge)
%
I
= 0mA, T = -40°C to +85°C
-2
A
Output Load Regulation
(Voltage Positioning)
Equal to inductor DC resistance
R
V/A
V
L
V
V
V
= 2.7V to 5.5V
= 2.7V to 5.5V
1.4
IH
IN
IN
SHDN Logic Input Level
V
0.4
1
IL
T
T
= +25°C
= +85°C
0.001
0.01
770
650
40
A
V
= 5.5V,
IN
SHDN Logic Input Bias Current
I
µA
IH,IL
SHDN = GND or IN
A
Peak Current Limit
I
pFET switch
nFET rectifier
nFET rectifier
590
450
10
1400
1300
70
mA
mA
mA
LIMP
Valley Current Limit
I
LIMN
Rectifier Off-Current Threshold
I
LXOFF
R
pFET switch, I = -40mA
0.6
0.35
0.1
1
1.2
0.7
1
ONP
ONN
LX
On-Resistance
Ω
µA
ns
R
nFET rectifier, I = 40mA
LX
T
= +25°C
= +85°C
A
A
V
= 5.5V, LX = GND
IN
LX Leakage Current
Minimum On and Off Times
I
LXLKG
to IN, SHDN = GND
T
t
95
ON(MIN)
t
95
OFF(MIN)
Thermal Shutdown
+160
20
°C
°C
Thermal-Shutdown Hysteresis
Note 2: All devices are 100% production tested at T = +25°C. Limits over the operating temperature range are guaranteed by design.
A
2
_______________________________________________________________________________________
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Y/MAX8640Z
Typical Operating Characteristics
(V = 3.6V, V
IN
= 1.5V, MAX8640Z, L = Murata LQH32CN series, T = +25°C, unless otherwise noted.)
A
OUT
EFFICIENCY vs. LOAD CURRENT
1.8V OUTPUT
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SWITCHING FREQUENCY
vs. LOAD CURRENT
100
90
80
70
60
50
40
30
20
10
0
10
35
30
25
20
15
10
5
MAX8640YEXT18
MAX8640YEXT18
MAX8640ZEXT15
MAX8640YEXT18
MAX8640ZEXT15
1
0.1
0.1
1
10
100
1000
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
0
100
200
300
400
500
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. LOAD CURRENT
(VOLTAGE POSITIONING)
LIGHT-LOAD SWITCHING WAVEFORMS
(I = 1mA)
OUT
MAX8640Y/Z toc05
1.55
1.50
1.45
1.40
1.35
1.30
20mV/div
(AC-COUPLED)
V
MAX8640ZEXT15
OUT
V
I
LX
2V/div
LX
200mA/div
10μs/div
0
100
200
300
400
500
LOAD CURRENT (mA)
MEDIUM-LOAD SWITCHING WAVEFORMS
(I = 40mA)
HEAVY-LOAD SWITCHING WAVEFORMS
(I = 300mA)
OUT
OUT
MAX8640Y/Z toc06
MAX8640Y/Z toc07
20mV/div
(AC-COUPLED)
20mV/div
(AC-COUPLED)
V
V
OUT
OUT
2V/div
0V
V
I
V
I
LX
LX
2V/div
0V
200mA/div
200mA/div
0mA
LX
LX
0mA
200ns/div
200ns/div
_______________________________________________________________________________________
3
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Typical Operating Characteristics (continued)
(V = 3.6V, V
IN
= 1.5V, MAX8640Z, L = Murata LQH32CN series, T = +25°C, unless otherwise noted.)
A
OUT
LIGHT-LOAD STARTUP WAVEFORM
HEAVY-LOAD STARTUP WAVEFORM
(100Ω LOAD)
(5Ω LOAD)
MAX8640Y/Z toc08
MAX8640Y/Z toc09
5V/div
5V/div
V
V
SHDN
SHDN
1V/div
0V
1V/div
0V
V
OUT
V
OUT
100mA/div
0mA
100mA/div
0mA
I
IN
I
IN
500mA/div
0mA
I
I
LX
500mA/div
0mA
LX
20μs/div
20μs/div
LINE-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
Y/MAX8640Z
(4V TO 3.5V TO 4V)
(5mA TO 250mA TO 5mA)
MAX8640Y/Z toc10
MAX8640Y/Z toc11
1V/div
4V
50m/div
AC-COUPLED
V
IN
V
OUT
500mA/div
I
LX
V
OUT
20mV/div
AC-COUPLED
200mA/div
0mA
I
200mA/div
0mA
I
OUT
LX
20μs/div
40μs/div
LOAD-TRANSIENT RESPONSE
(10mA TO 500mA TO 10mA)
MAX8640Y/Z toc12
100mV/div
V
OUT
AC-COUPLED
I
LX
500mA/div
0V
I
OUT
200mA/div
40μs/div
4
_______________________________________________________________________________________
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Y/MAX8640Z
Pin Description
PIN
1
NAME
LX
FUNCTION
Inductor Connection to the Internal Drains of the p-channel and n-channel MOSFETs. High impedance
during shutdown.
2, 5
3
GND
OUT
Ground. Connect these pins together directly under the IC.
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.
Active-Low Shutdown Input. Connect to IN or logic-high for normal operation. Connect to GND or logic-low for
shutdown mode.
4
6
SHDN
Supply Voltage Input. Input voltage range is 2.7V to 5.5V. Bypass with a ceramic capacitor as close as
possible to pin 6 (IN) and pin 5 (GND).
IN
Detailed Description
IN
The MAX8640Y/MAX8640Z step-down converters deliv-
er 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 efficien-
cy and size of external components. At loads below
100mA, the MAX8640Y/MAX8640Z automatically switch
to pulse-skipping mode to minimize the typical quies-
cent current (28µA). 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.
PWM
LOGIC
SHDN
LX
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 compo-
nents. 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 mini-
mum 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 synchro-
nous 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.
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 tra-
ditional 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.
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
_______________________________________________________________________________________
5
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
It is acceptable to use a 1.5µH inductor with either the
Soft-Start
The MAX8640Y/MAX8640Z include internal soft-start
circuitry that eliminates inrush current at startup, reduc-
ing transients on the input source. Soft-start is particu-
larly useful for higher impedance input sources, such
as Li+ and alkaline cells. See the Soft-Start Response
in the Typical Operating Characteristics.
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 lit-
tle impact on performance.
Applications Information
The MAX8640Y/MAX8640Z are optimized for use with a
tiny inductor and small ceramic capacitors. The correct
selection of external components ensures high efficien-
cy, low output ripple, and fast transient response.
Inductor Selection
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.
Capacitor Selection
Output Capacitor
The output capacitor, C2, is required to keep the output
voltage ripple small and to ensure regulation loop sta-
bility. C2 must have low impedance at the switching fre-
quency. Ceramic capacitors are recommended due to
Y/MAX8640Z
Table 1. Suggested Inductors
INDUCTANCE
(µH)
DC RESISTANCE
CURRENT RATING
(mA)
DIMENSIONS
L x W x H (mm)
MANUFACTURER
SERIES
(Ω typ)
MIPFT2520D
2.0
1.5
2.2
3.3
1.0
1.5
2.2
1.2
1.5
2.2
1.0
1.5
2.2
1.0
2.2
1.0
2.2
1.0
2.2
1.0
2.2
1.0
2.2
0.16
0.07
0.08
0.10
0.12
0.16
0.22
0.08
0.09
0.12
0.11
0.13
0.14
0.15
0.36
0.07
0.10
0.10
0.20
0.05
0.08
0.07
0.14
900
1500
1300
1200
1200
1000
900
2.5 x 2.0 x 0.5
2.5 x 2.0 x 1.0
FDK
MIPF2520D
LQM31P
Murata
3.2 x 1.6 x 0.95
3.0 x 3.0 x 1.0
3.2 x 1.6 x 0.9
590
Sumida
CDRH2D09
CKP3216T
520
440
1100
1000
900
Taiyo Yuden
460
GLF201208T
GLF2012T
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
300
400
TDK
300
800
GLF251812T
MDT2520-CR
D2812C
600
1000
700
TOKO
1100
770
6
_______________________________________________________________________________________
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Y/MAX8640Z
their small size and low ESR. Make sure the capacitor
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 main-
tains its capacitance over temperature and DC bias.
Capacitors with X5R or X7R temperature characteristics
maintains its capacitance over temperature and DC
bias. Capacitors with X5R or X7R temperature charac-
teristics typically perform well. The output capacitance
can be very low; see the Selector Guide for recom-
mended capacitance values. For optimum load-tran-
sient performance and very low output ripple, the output
capacitor value in µF should be equal to or larger than
the inductor value in µH.
Selector Guide
RECOMMENDED COMPONENTS
TOP MARK
OUTPUT
VOLTAGE (V)
FREQUENCY
(MHz)
PART
C2 (µF)
10
L1 (µH)
2.2
MAX8640YEXT08
MAX8640YEXT10
MAX8640YEXT11
MAX8640YEXT12
MAX8640YEXT13
MAX8640YEXT15
MAX8640YEXT16
MAX8640YEXT18
MAX8640YEXT19
MAX8640YEXT24
MAX8640YEXT25
0.8
1.0
1.1
1.2
1.3
1.5
1.6
1.8
1.9
2.4
2.5
1.2
1.6
1.7
1.8
1.9
2.0
2.0
2.0
2.0
2.0
1.7
ACQ
ADF
ACR
ACS
ACG
ADD
ADB
ACI
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
10
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
ACH
ADM
ACJ
2.2
2.2
MAX8640YEXT82
MAX8640YELT08
2.85
0.8
1.5
1.2
2.2
2.2
ADJ
NB
MAX8640YELT11
MAX8640YELT12
MAX8640YELT13
MAX8640YELT15
MAX8640YELT16
MAX8640YELT18
MAX8640YELT19
MAX8640YELT25
MAX8640YELT82
1.1
1.2
1.3
1.5
1.6
1.8
1.9
2.5
2.85
1.7
1.8
1.9
2.0
2.0
2.0
2.0
1.7
1.5
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
2.2
2.2
2.2
2.2
2.2
4.7
2.2
NC
ND
NE
NF
NG
NH
NI
NJ
OW
MAX8640ZEXT08
MAX8640ZEXT11
MAX8640ZEXT12
MAX8640ZEXT13
MAX8640ZEXT15
MAX8640ZEXT18
MAX8640ZELT08
MAX8640ZELT11
0.8
1.1
1.2
1.3
1.5
1.8
0.8
1.1
2.4
3.4
3.6
3.7
3.9
4.0
2.4
3.4
1
1
1
1
1
1
1
1
ACL
ACM
ACN
ACO
ACP
ACU
NK
NL
_______________________________________________________________________________________
7
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Selector Guide (continued)
RECOMMENDED COMPONENTS
OUTPUT
VOLTAGE (V)
FREQUENCY
(MHz)
PART
TOP MARK
C2 (µF)
2.2
L1 (µH)
MAX8640ZELT12
MAX8640ZELT13
MAX8640ZELT15
MAX8640ZELT18
1.2
1.3
1.5
1.8
3.6
3.7
3.9
4.0
1
1
1
1
NM
NN
NO
NP
2.2
2.2
2.2
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.
Ordering Information (continued)
PIN-
PACKAGE
PART*
TOP MARK
MAX8640YEXT24+T
MAX8640YEXT25+T
MAX8640YELT08+T
MAX8640YELT11+T
6 SC70
6 SC70
6 µDFN
6 µDFN
ADM
ACJ
NB
PCB Layout and Routing
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.
NC
MAX8640YELT12+T
MAX8640YELT13+T
MAX8640YELT15+T
MAX8640YELT16+T
MAX8640YELT18+T
MAX8640YELT19+T
MAX8640YELT25+T
MAX8640YELT82+T
6 µDFN
6 µDFN
6 µDFN
6 µDFN
6 µDFN
6 µDFN
6 µDFN
6 µDFN
ND
NE
NF
NG
NH
NI
Y/MAX8640Z
NJ
OW
MAX8640ZEXT08+T
MAX8640ZEXT11+T
MAX8640ZEXT12+T
MAX8640ZEXT13+T
MAX8640ZEXT15+T
MAX8640ZEXT18+T
MAX8640ZELT08+T
MAX8640ZELT11+T
MAX8640ZELT12+T
MAX8640ZELT13+T
MAX8640ZELT15+T
MAX8640ZELT18+T
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 SC70
6 µDFN
6 µDFN
6 µDFN
6 µDFN
6 µDFN
6 µDFN
ACL
ACM
ACN
ACO
ACP
ACU
NK
Chip Information
PROCESS: BiCMOS
NL
NM
NN
NO
NP
*Contact factory for availability of each version. For 2.85V output
(82 version), request application note that includes limitations
and typical operating characteristics.
+Denotes a lead(Pb)-free/RoHS-compliant 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
Y/MAX8640Z
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE
6 µDFN
PACKAGE CODE
L611-1
DOCUMENT NO.
21-0147
6 SC70
X6S-1
21-0077
TOPMARK
2
3
e
b
5
A
5
4
4
6
PIN 1
0.075x45∞
L
E
AA
3
2
1
1
A2
PIN 1
MARK
A
A
L2
L1
D
A1
TOP VIEW
SIDE VIEW
BOTTOM VIEW
COMMON DIMENSIONS
b
MIN.
0.65
--
0.00
1.45
0.95
0.30
0.00
0.05
0.17
NOM.
0.72
0.20
--
1.50
1.00
0.35
--
MAX.
0.80
--
0.05
1.55
1.05
0.40
0.08
0.10
0.23
A
A1
A2
D
E
L
L1
L2
b
SECTION A-A
--
0.20
0.50 BSC.
e
Pkg.
Code
L611-1, L611-2
TITLE:
PACKAGE OUTLINE, 6L uDFN, 1.5x1.0x0.8mm
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
-DRAWING NOT TO SCALE-
21-0147
E
2
_______________________________________________________________________________________
9
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
TOPMARK
2
3
e
b
5
A
5
4
4
6
PIN 1
0.075x45∞
L
E
AA
3
2
1
1
A2
PIN 1
MARK
A
A
L2
L1
D
A1
SIDE VIEW
TOP VIEW
BOTTOM VIEW
COMMON DIMENSIONS
b
MIN.
0.65
--
0.00
1.45
0.95
0.30
0.00
0.05
0.17
NOM.
0.72
0.20
--
1.50
1.00
0.35
--
MAX.
0.80
--
0.05
1.55
1.05
0.40
0.08
0.10
0.23
Y/MAX8640Z
A
A1
A2
D
E
L
L1
L2
b
SECTION A-A
--
0.20
0.50 BSC.
e
Pkg.
Code
L611-1, L611-2
TITLE:
PACKAGE OUTLINE, 6L uDFN, 1.5x1.0x0.8mm
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
-DRAWING NOT TO SCALE-
21-0147
E
2
10 ______________________________________________________________________________________
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Y/MAX8640Z
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
______________________________________________________________________________________ 11
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
Added MAX8640YEXT10+T voltage option
3
4
6/08
2/09
7
Added MAX8640YEXT24+T voltage option and
MAX8640YELT82+MAX8640YEXT82+ (82 = 2.85V), and corrected error
1, 2, 7, 8
Y/MAX8640Z
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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