MAX8561ETA+T Maxim Integrated Products, MAX8561ETA+T Datasheet

IC DC-DC CONV ADJ 500MA 8-TDFN

MAX8561ETA+T

Manufacturer Part Number
MAX8561ETA+T
Description
IC DC-DC CONV ADJ 500MA 8-TDFN
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX8560EZKT.pdf (12 pages)

Specifications of MAX8561ETA+T

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.6 ~ 2.5 V
Current - Output
500mA
Frequency - Switching
4MHz
Voltage - Input
2.7 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-TDFN Exposed Pad
Power - Output
1.95W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8560/MAX8561/MAX8562 step-down DC-DC
converters are optimized for applications that prioritize
small size and high efficiency. They utilize a proprietary
hysteretic-PWM control scheme that switches with fixed
frequency and is adjustable up to 4MHz, allowing cus-
tomers to trade efficiency for smaller external compo-
nents. Output current is guaranteed up to 500mA, while
quiescent current is only 40µA (typ).
Internal synchronous rectification greatly improves effi-
ciency and eliminates the external Schottky diode
required in conventional step-down converters. Built-in
soft-start eliminates inrush current to reduce input
capacitor requirements. The MAX8561 features logic-
controlled output voltage, while the MAX8562 drives an
external bypass FET.
The MAX8560 is available in a 5-pin Thin SOT23 pack-
age. The MAX8561/MAX8562 are available in space-
saving 8-pin 3mm x 3mm Thin DFN packages.
19-2954; Rev 2; 8/05
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.
2.7V TO 5.5V
INPUT
ON/OFF
2.2µF
Microprocessor/DSP Core Supplies
Cellular and Smart Phones
CDMA/RF Power-Amplifier Supplies
PDAs, DSC, and MP3 Players
C
IN
SHDN
IN
GND
Typical Operating Circuit
DC-DC Converters in Thin SOT and TDFN
________________________________________________________________ Maxim Integrated Products
MAX8560
4MHz, 500mA Synchronous Step-Down
General Description
LX
FB
R1
R2
Applications
1µH
C
L
FF
UP TO 500mA
0.6V TO 2.5V
OUTPUT
C
2.2µF
OUT
♦ Up to 4MHz PWM Switching Frequency
♦ 500mA Guaranteed Output Current
♦ 40µA (typ) Quiescent Current
♦ Adjustable Output Voltage from 0.6V to 2.5V
♦ Logic-Controlled Output Voltage (MAX8561)
♦ Drives External Bypass FET (MAX8562)
♦ ±1.5% Initial Accuracy
♦ Soft-Start Eliminates Inrush Current
♦ Fast Voltage-Positioning Transient Response
♦ Internal Synchronous Rectifier
♦ 2.7V to 5.5V Input
♦ 0.1µA Logic-Controlled Shutdown
♦ Thermal Shutdown
♦ Thin SOT23 or Space-Saving 3mm x 3mm x
+Denotes lead-free package.
MAX8560EZK-T
MAX8560EZK+T
MAX8561ETA-T
MAX8561ETA+T
MAX8562ETA-T
MAX8562ETA+T
TOP VIEW
0.8mm TDFN Packages
SHDN
PART
GND
IN
1
2
3
Thin SOT23-5
MAX8560
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
5 LX
4
FB
Pin Configurations
3mm × 3mm × 0.8mm
A "+" sign will replace the first pin indicator
on lead-free packages.
8
PIN-PACKAGE
5 Thin SOT23-5
5 Thin SOT23-5
8 TDFN
8 TDFN
8 TDFN
8 TDFN
1
MAX8561/
MAX8562
TDFN
7
2
6
3
Features
5
4
MARK
ADRX
ADRX
TOP
AHD
AHD
AHE
AHE
1

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MAX8561ETA+T Summary of contents

Page 1

... Internal Synchronous Rectifier ♦ 2.7V to 5.5V Input ♦ 0.1µA Logic-Controlled Shutdown ♦ Thermal Shutdown ♦ Thin SOT23 or Space-Saving 3mm x 3mm x 0.8mm TDFN Packages Applications PART MAX8560EZK-T MAX8560EZK+T MAX8561ETA-T MAX8561ETA+T MAX8562ETA-T MAX8562ETA+T +Denotes lead-free package. TOP VIEW OUTPUT L 0.6V TO 2.5V 1µ 500mA ...

Page 2

Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN ABSOLUTE MAXIMUM RATINGS SHDN, ODI, ODO to GND ............................-0.3V to +6V IN, FB GND (Note 1)......................................-0. PGND to GND .......................................................-0.3V to +0.3V LX Current ...........................................................................1.27A ...

Page 3

Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN ELECTRICAL CHARACTERISTICS (continued) = 3.6V, SHDN = IN -40°C to +85°C, typical values are PARAMETER SYMBOL ODO Pullup to IN (MAX8562 Only) ...

Page 4

Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN (V = 3.6V 1.2V 1µH (LQH32CN1R0M53 OUT EFFICIENCY vs. LOAD CURRENT (V = 1.2V) OUT 100 90 4.7µH 80 2.2µH 1µ ...

Page 5

Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN (V = 3.6V 1.2V 1µH (LQH32CN1R0M53 OUT LIGHT-LOAD SOFT-START WAVEFORMS MAX8560 toc12 100Ω LOAD V OUT 1V/div I IN 200mA/div I L 200mA/div ...

Page 6

Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN PIN NAME MAX8561 MAX8560 MAX8562 GND SHDN — 2 PGND — 5 ODO — 4 ODI ...

Page 7

Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN Connecting SHDN to GND or logic low places the MAX8560/MAX8561/MAX8562 in shutdown mode and reduces supply current to 0.1µA. In shutdown, the con- trol circuitry, internal-switching P-channel MOSFET, and ...

Page 8

Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN INPUT Li+ BATTERY LX IN 2.2µF MAX8561 100kΩ GND FB 120kΩ ON/OFF SHDN ODO 1.5/1.0 ODI 150kΩ PGND Figure 2. Using ODI/ODO to Obtain Two Output Voltages from the ...

Page 9

Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN Table 1. Suggested Inductors MANUFACTURER SERIES LB2012 LB2016 Taiyo Yuden LB2518 LBC2518 LQH31C_03 LQH32C_53 Murata LQM43FN D310F TOKO D312C Sumida CDRH2D11 _______________________________________________________________________________________ INDUCTANCE ESR CURRENT RATING (µH) (Ω) 1.0 ...

Page 10

Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN (a) MAX8560 (b) MAX8561 (c) MAX8562 Figure 4. Recommended PC Board Layout 10 ______________________________________________________________________________________ Chip Information TRANSISTOR COUNT: 1271 PROCESS: BiCMOS ...

Page 11

Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ Package Information 11 ...

Page 12

... 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 © 2005 Maxim Integrated Products Package Information (continued) ...

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