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19-3997; Rev 4; 2/09
KIT ATION EVALU LE B AVAILA
Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters
General Description
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 1H inductor and 2.2F output capacitor. The MAX8640Y switches at up to 2MHz for higher efficiency while still allowing small 2.2H and 4.7F components. Output current is guaranteed up to 500mA, while typical quiescent current is 28A. 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 DFN (1.5mm x 1.0mm) packages. Both packages are lead-free.
Features
Tiny SC70 and DFN Packages 500mA Guaranteed Output Current 4MHz or 2MHz PWM Switching Frequency Tiny External Components: 1H/2.2F or 2.2H/4.7F 28A 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
MAX8640Y/MAX8640Z
Ordering Information
PART* MAX8640YEXT08+T MAX8640YEXT10+T MAX8640YEXT11+T MAX8640YEXT12+T MAX8640YEXT13+T MAX8640YEXT15+T MAX8640YEXT16+T MAX8640YEXT18+T MAX8640YEXT19+T PINPACKAGE 6 SC70 6 SC70 6 SC70 6 SC70 6 SC70 6 SC70 6 SC70 6 SC70 6 SC70 TOP MARK ACQ ADF ACR ACS ACG ADD ADB ACI ACH
Applications
Microprocessor/DSP Core Power I/O Power Cell Phones, PDAs, DSCs, MP3s Other Handhelds Where Space Is Limited
MAX8640YEXT82+T 6 SC70 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 -40C to +85C operating temperature range. Ordering Information continued and Selector Guide appears at end of data sheet.
Typical Operating Circuit
INPUT 2.7V TO 5.5V IN C1 2.2F LX
GND 2
Pin Configurations
TOP VIEW
+ LX 1 6 IN LX + 1 6 IN
L1 1H OR 2.2H
OUTPUT 0.8V TO 2.5V UP TO 500mA
MAX8640Y GND MAX8640Z OUT
C2 2.2F OR 4.7F
MAX8640Y MAX8640Z
5
GND
GND
2
MAX8640Y MAX8640Z
5
GND
OUT
3
4
SHDN
OUT
3
4
SHDN
ON/OFF
SHDN
SC70 2.0mm x 2.1mm
DFN 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 MAX8640Y/MAX8640Z
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +6V 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 = +70C) 6-Pin SC70 (derate 3.1mW/C above +70C) ..............245mW 6-Pin DFN (derate 2.1mW/C above +70C) ..............167.7mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = -40C to +85C, typical values are at TA = +25C, unless otherwise noted.) (Note 2)
PARAMETER Supply Range UVLO Threshold Supply Current Output Voltage Range Output Voltage Accuracy (Falling Edge) Output Load Regulation (Voltage Positioning) SHDN Logic Input Level SHDN Logic Input Bias Current Peak Current Limit Valley Current Limit Rectifier Off-Current Threshold On-Resistance LX Leakage Current Minimum On and Off Times Thermal Shutdown Thermal-Shutdown Hysteresis VIH VIL IIH,IL ILIMP ILIMN ILXOFF RONP RONN ILXLKG tON(MIN) tOFF(MIN) SYMBOL VIN UVLO ICC VOUT VIN rising, 100mV hysteresis No load, no switching SHDN = GND Factory preset ILOAD = 0mA, TA = +25C ILOAD = 0mA, TA = -40C to +85C Equal to inductor DC resistance VIN = 2.7V to 5.5V VIN = 2.7V to 5.5V VIN = 5.5V, SHDN = GND or IN pFET switch nFET rectifier nFET rectifier pFET switch, ILX = -40mA nFET rectifier, ILX = 40mA VIN = 5.5V, LX = GND to IN, SHDN = GND TA = +25C TA = +85C TA = +25C TA = +85C 590 450 10 0.001 0.01 770 650 40 0.6 0.35 0.1 1 95 95 +160 20 1400 1300 70 1.2 0.7 1 1.4 0.4 1 TA = +25C TA = +85C 0.8 -1 -2 RL 0 CONDITIONS MIN 2.7 2.44 2.6 28 0.01 0.1 2.5 +1 +2 V % V/A V A mA mA mA A ns C C TYP MAX 5.5 2.70 48 0.1 A UNITS V V
Note 2: All devices are 100% production tested at TA = +25C. Limits over the operating temperature range are guaranteed by design.
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Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters
Typical Operating Characteristics
(VIN = 3.6V, VOUT = 1.5V, MAX8640Z, L = Murata LQH32CN series, TA = +25C, unless otherwise noted.)
MAX8640Y/MAX8640Z
EFFICIENCY vs. LOAD CURRENT 1.8V OUTPUT
MAX8640Y/Z toc01
NO-LOAD SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX8640YEXT18
MAX8640Y/Z toc02
SWITCHING FREQUENCY vs. LOAD CURRENT
MAX8640ZEXT15 SWITCHING FREQUENCY (MHz)
MAX8640Y/Z toc03
100 90 80 70 EFFICIENCY (%) 60 50 40 30 20 10 0 0.1 1 10 100 LOAD CURRENT (mA) MAX8640YEXT18
35 30 SUPPLY CURRENT (A) 25 20 15 10 5
10
MAX8640ZEXT15
1 MAX8640YEXT18
0.1 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 0 100 SUPPLY VOLTAGE (V) 200 300 400 LOAD CURRENT (mA) 500
1000
OUTPUT VOLTAGE vs. LOAD CURRENT (VOLTAGE POSITIONING)
MAX8640Y/Z toc04
LIGHT-LOAD SWITCHING WAVEFORMS (IOUT = 1mA)
VOUT
1.55 MAX8640ZEXT15 1.50 OUTPUT VOLTAGE (V)
MAX8640Y/Z toc05
20mV/div (AC-COUPLED)
1.45 VLX 1.40 2V/div
1.35
ILX
200mA/div
1.30 0 100 200 300 400 LOAD CURRENT (mA) 500 10s/div
MEDIUM-LOAD SWITCHING WAVEFORMS (IOUT = 40mA)
MAX8640Y/Z toc06
HEAVY-LOAD SWITCHING WAVEFORMS (IOUT = 300mA)
MAX8640Y/Z toc07
VOUT
20mV/div (AC-COUPLED)
VOUT
20mV/div (AC-COUPLED)
2V/div VLX 2V/div 0V 200mA/div 0mA 200ns/div VLX 0V 200mA/div ILX ILX
0mA 200ns/div
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Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters MAX8640Y/MAX8640Z
Typical Operating Characteristics (continued)
(VIN = 3.6V, VOUT = 1.5V, MAX8640Z, L = Murata LQH32CN series, TA = +25C, unless otherwise noted.)
LIGHT-LOAD STARTUP WAVEFORM (100 LOAD)
MAX8640Y/Z toc08
HEAVY-LOAD STARTUP WAVEFORM (5 LOAD)
MAX8640Y/Z toc09
VSHDN
5V/div 1V/div
VSHDN
5V/div 1V/div
VOUT
0V 100mA/div
VOUT
0V 100mA/div
IIN
0mA 500mA/div
IIN ILX
0mA 500mA/div 0mA
ILX
0mA 20s/div
20s/div
LINE-TRANSIENT RESPONSE (4V TO 3.5V TO 4V)
MAX8640Y/Z toc10
LOAD-TRANSIENT RESPONSE (5mA TO 250mA TO 5mA)
MAX8640Y/Z toc11
VIN
1V/div 4V
VOUT
50m/div AC-COUPLED
VOUT
20mV/div AC-COUPLED
ILX
500mA/div
200mA/div ILX 200mA/div 0mA 20s/div 40s/div IOUT 0mA
LOAD-TRANSIENT RESPONSE (10mA TO 500mA TO 10mA)
MAX8640Y/Z toc12
VOUT
100mV/div AC-COUPLED 500mA/div 0V
ILX
IOUT 200mA/div
40s/div
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Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters
Pin Description
PIN 1 2, 5 3 4 6 NAME LX GND OUT SHDN IN FUNCTION Inductor Connection to the Internal Drains of the p-channel and n-channel MOSFETs. High impedance during shutdown. 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. 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).
MAX8640Y/MAX8640Z
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 (28A). 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
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 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.
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 0.1A (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
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
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Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters MAX8640Y/MAX8640Z
Soft-Start
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. It is acceptable to use a 1.5H inductor with either the MAX8640Y or MAX8640Z, but efficiency and ripple should be verified. Similarly, it is acceptable to use a 3.3H 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 75m to 150m 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.
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 efficiency, low output ripple, and fast transient response.
Inductor Selection
A 1H inductor is recommended for use with the MAX8640Z, and 2.2H is recommended for the MAX8640Y. A 1H 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 stability. C2 must have low impedance at the switching frequency. Ceramic capacitors are recommended due to
Table 1. Suggested Inductors
MANUFACTURER SERIES MIPFT2520D FDK MIPF2520D INDUCTANCE (H) 2.0 1.5 2.2 3.3 1.0 Murata LQM31P 1.5 2.2 1.2 Sumida CDRH2D09 1.5 2.2 1.0 Taiyo Yuden CKP3216T 1.5 2.2 GLF201208T TDK GLF2012T GLF251812T MDT2520-CR TOKO D2812C 1.0 2.2 1.0 2.2 1.0 2.2 1.0 2.2 1.0 2.2 DC RESISTANCE ( typ) 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 CURRENT RATING (mA) 900 1500 1300 1200 1200 1000 900 590 520 440 1100 1000 900 460 300 400 300 800 600 1000 700 1100 770 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 3.2 x 1.6 x 0.9 3.0 x 3.0 x 1.0 3.2 x 1.6 x 0.95 2.5 x 2.0 x 1.0 DIMENSIONS L x W x H (mm) 2.5 x 2.0 x 0.5
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Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters
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 F should be equal to or larger than the inductor value in H.
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
MAX8640Y/MAX8640Z
Selector Guide
PART MAX8640YEXT08 MAX8640YEXT10 MAX8640YEXT11 MAX8640YEXT12 MAX8640YEXT13 MAX8640YEXT15 MAX8640YEXT16 MAX8640YEXT18 MAX8640YEXT19 MAX8640YEXT24 MAX8640YEXT25 MAX8640YEXT82 MAX8640YELT08 MAX8640YELT11 MAX8640YELT12 MAX8640YELT13 MAX8640YELT15 MAX8640YELT16 MAX8640YELT18 MAX8640YELT19 MAX8640YELT25 MAX8640YELT82 MAX8640ZEXT08 MAX8640ZEXT11 MAX8640ZEXT12 MAX8640ZEXT13 MAX8640ZEXT15 MAX8640ZEXT18 MAX8640ZELT08 MAX8640ZELT11 OUTPUT VOLTAGE (V) 0.8 1.0 1.1 1.2 1.3 1.5 1.6 1.8 1.9 2.4 2.5 2.85 0.8 1.1 1.2 1.3 1.5 1.6 1.8 1.9 2.5 2.85 0.8 1.1 1.2 1.3 1.5 1.8 0.8 1.1 FREQUENCY (MHz) 1.2 1.6 1.7 1.8 1.9 2.0 2.0 2.0 2.0 2.0 1.7 1.5 1.2 1.7 1.8 1.9 2.0 2.0 2.0 2.0 1.7 1.5 2.4 3.4 3.6 3.7 3.9 4.0 2.4 3.4 RECOMMENDED COMPONENTS L1 (H) 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 1 1 1 1 1 1 1 1 C2 (F) 10 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 10 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 TOP MARK ACQ ADF ACR ACS ACG ADD ADB ACI ACH ADM ACJ ADJ NB NC ND NE NF NG NH NI NJ OW ACL ACM ACN ACO ACP ACU NK NL
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Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters MAX8640Y/MAX8640Z
Selector Guide (continued)
PART MAX8640ZELT12 MAX8640ZELT13 MAX8640ZELT15 MAX8640ZELT18 OUTPUT VOLTAGE (V) 1.2 1.3 1.5 1.8 FREQUENCY (MHz) 3.6 3.7 3.9 4.0 RECOMMENDED COMPONENTS L1 (H) 1 1 1 1 C2 (F) 2.2 2.2 2.2 2.2 TOP MARK NM NN NO NP
Ordering Information (continued)
PART* MAX8640YEXT24+T MAX8640YEXT25+T MAX8640YELT08+T MAX8640YELT11+T MAX8640YELT12+T MAX8640YELT13+T MAX8640YELT15+T MAX8640YELT16+T MAX8640YELT18+T MAX8640YELT19+T MAX8640YELT25+T MAX8640YELT82+T MAX8640ZEXT08+T MAX8640ZEXT11+T MAX8640ZEXT12+T MAX8640ZEXT13+T MAX8640ZEXT15+T MAX8640ZEXT18+T MAX8640ZELT08+T MAX8640ZELT11+T MAX8640ZELT12+T MAX8640ZELT13+T MAX8640ZELT15+T MAX8640ZELT18+T PINPACKAGE 6 SC70 6 SC70 6 DFN 6 DFN 6 DFN 6 DFN 6 DFN 6 DFN 6 DFN 6 DFN 6 DFN 6 DFN 6 SC70 6 SC70 6 SC70 6 SC70 6 SC70 6 SC70 6 DFN 6 DFN 6 DFN 6 DFN 6 DFN 6 DFN TOP MARK ADM ACJ NB NC ND NE NF NG NH NI NJ OW ACL ACM ACN ACO ACP ACU NK NL NM NN NO NP
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 F that is equal to or larger than the inductor's value in H.
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.
Chip Information
PROCESS: BiCMOS
*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 -40C to +85C operating temperature range.
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Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 6 DFN 6 SC70 PACKAGE CODE L611-1 X6S-1 DOCUMENT NO. 21-0147 21-0077
MAX8640Y/MAX8640Z
TOPMARK 2 4 5
3
A
4
e
5
b
6 PIN 1 0.075x45
AA
PIN 1 MARK
1
E
L
A2 D TOP VIEW A1 SIDE VIEW
3
2 A A
1
L1
L2
BOTTOM VIEW
COMMON DIMENSIONS
b
A A1 A2 D E L L1 L2 b e Pkg. Code
SECTION A-A
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 --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 DOCUMENT CONTROL NO. REV.
-DRAWING NOT TO SCALE-
21-0147
E
1
2
_______________________________________________________________________________________
6L UDFN.EPS
9
Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters MAX8640Y/MAX8640Z
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
TOPMARK 2 4 5
3
A
4
e
5
b
6 PIN 1 0.075x45
AA
PIN 1 MARK
1
E
L
A2 D TOP VIEW A1 SIDE VIEW
3
2 A A
1
L1
L2
BOTTOM VIEW
COMMON DIMENSIONS
b
A A1 A2 D E L L1 L2 b e Pkg. Code
SECTION A-A
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 --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 DOCUMENT CONTROL NO. REV.
-DRAWING NOT TO SCALE-
21-0147
E
1
2
10
______________________________________________________________________________________
6L UDFN.EPS
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.
MAX8640Y/MAX8640Z
______________________________________________________________________________________
SC70, 6L.EPS
11
Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters MAX8640Y/MAX8640Z
Revision History
REVISION NUMBER 3 4 REVISION DATE 6/08 2/09 DESCRIPTION Added MAX8640YEXT10+T voltage option Added MAX8640YEXT24+T voltage option and MAX8640YELT82+MAX8640YEXT82+ (82 = 2.85V), and corrected error PAGES CHANGED 7 1, 2, 7, 8
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 (c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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