MAX8625AETD+T Maxim Integrated Products, MAX8625AETD+T Datasheet

IC PWM STEP-UP/DWN REG 14-TDFN

MAX8625AETD+T

Manufacturer Part Number
MAX8625AETD+T
Description
IC PWM STEP-UP/DWN REG 14-TDFN
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck), Step-Up (Boost)r
Datasheet

Specifications of MAX8625AETD+T

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
3.3V, 1.25 ~ 4 V
Current - Output
800mA
Frequency - Switching
1MHz
Voltage - Input
2.5 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
14-TDFN Exposed Pad
Power - Output
1.48W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8625A PWM step-up/down regulator is intend-
ed to power digital logic, hard disk drives, motors, and
other loads in portable, battery-powered devices such
as PDAs, cell phones, digital still cameras (DSCs), and
MP3 players. The MAX8625A provides either a fixed
3.3V or adjustable output voltage (1.25V to 4V) at up to
0.8A from a 2.5V to 5.5V input. The MAX8625A utilizes
a 2A peak current limit.
Maxim’s proprietary H-bridge topology provides a
seamless transition through all operating modes without
the glitches commonly seen with other devices. Four
internal MOSFETs (two switches and two synchronous
rectifiers) with internal compensation minimize external
components. A SKIP input selects a low-noise, fixed-
frequency PWM mode, or a high-efficiency skip mode
where the converter automatically switches to PFM
mode under light loads for best light-load efficiency.
The internal oscillator operates at 1MHz to allow for a
small external inductor and capacitors.
The MAX8625A features current-limit circuitry that shuts
down the IC in the event of an output overload. In addi-
tion, soft-start circuitry reduces inrush current during
startup. The IC also features True Shutdown
disconnects the output from the input when the IC is
disabled. The MAX8625A is available in a 3mm x 3mm,
14-pin TDFN package.
19-1006; Rev 4; 4/09
True Shutdown is a trademark of Maxim Integrated Products, Inc.
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.
PDAs and Smartphones
DSCs and Camcorders
MP3 Players and Cellular Phones
Battery-Powered Hard Disk Drive (HDD)
TOP VIEW
EP = EXPOSED PAD.
14
________________________________________________________________ Maxim Integrated Products
1
+
13
2
General Description
12
TDFN-EP
3
MAX8625A
High-Efficiency, Seamless Transition,
11
4
Pin Configuration
10
5
9
6
EP
Applications
8
7
Step-Up/Down DC-DC Converter
TM
, which
♦ Four Internal MOSFET True H-Bridge Buck/Boost
♦ Glitch-Free, Buck-Boost Transitions
♦ Minimal Output Ripple Variation on Transitions
♦ Up to 92% Efficiency
♦ 37µA (typ) Quiescent Current in Skip Mode
♦ 2.5V to 5.5V Input Range
♦ Fixed 3.3V or Adjustable Output
♦ 1µA (max) Logic-Controlled Shutdown
♦ True Shutdown
♦ Output Overload Protection
♦ Internal Compensation
♦ Internal Soft-Start
♦ 1MHz Switching Frequency
♦ Thermal-Overload Protection
♦ Small 3mm x 3mm, 14-Pin TDFN Package
Note: The device is specified over the -40°C to +85°C extended
temperature range.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
** EP = Exposed pad.
MAX8625AETD+
OFF
PART
SKIP
2.7V TO 5.5V
INPUT
PWM
ON
Typical Operating Circuit
PIN-
PACKAGE
14 TDFN-EP**
Ordering Information
IN
SKIP
ON
LX1
MAX8625A
LX2
GND
OUT
REF
FB
TOP MARK
Features
OUTPUT
3.3V
ABQ
1

Related parts for MAX8625AETD+T

MAX8625AETD+T Summary of contents

Page 1

... TDFN- EXPOSED PAD. True Shutdown is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 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. Step-Up/Down DC-DC Converter ♦ Four Internal MOSFET True H-Bridge Buck/Boost ♦ Glitch-Free, Buck-Boost Transitions ♦ ...

Page 2

High-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter ABSOLUTE MAXIMUM RATINGS IN, OUT, SKIP GND ......................................-0.3V to +6V REF GND.............................................-0.3V to (IN + 0.3V) LX2, LX1 (Note 1).........................................................±1.5A Continuous Power Dissipation (T = +70°C) A Single-Layer Board (derate ...

Page 3

High-Efficiency, Seamless Transition, ELECTRICAL CHARACTERISTICS (continued) = 3.6V SKIP = IN GND Typical values are +25°C, unless otherwise noted.) (Note 2) A PARAMETER SYMBOL FB Dual-Mode Threshold V FB Leakage ...

Page 4

High-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter = 3.6V, SKIP = GND +25°C, Figure 4, unless otherwise noted EFFICIENCY vs. LOAD CURRENT SKIP AND FPWM MODES 100 3.3V OUT ...

Page 5

High-Efficiency, Seamless Transition, = 3.6V, SKIP = GND +25°C, Figure 4, unless otherwise noted MAXIMUM LOAD CURRENT vs. INPUT VOLTAGE 1000 900 800 700 600 500 400 300 200 100 0 2.0 2.5 3.0 3.5 ...

Page 6

High-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter = 3.6V, SKIP = GND +25°C, Figure 4, unless otherwise noted STARTUP WAVEFORMS V = 3.6V, LOAD = 5Ω 2V/div I BATT 500mA/div 2ms/div LOAD TRANSIENT ...

Page 7

High-Efficiency, Seamless Transition, = 3.6V, SKIP = GND +25°C, Figure 4, unless otherwise noted MINIMUM STARTUP VOLTAGE vs. TEMPERATURE 2.48 2.46 2.44 2.42 2.40 2.38 2.36 2.34 2.32 2.30 2.28 -50 -25 0 TEMPERATURE (°C) ...

Page 8

High-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter PIN NAME Inductor Connection 1. Connect the inductor between LX1 and LX2. Both LX1 pins must be connected 1, 2 LX1 together externally. LX1 is internally connected to GND during shutdown. Inductor Connection 2. ...

Page 9

High-Efficiency, Seamless Transition, IN UVLO ON SKIP REF REFERENCE GND MAX8625A Figure 1. Simplified Block Diagram times. This reduces the ripple and removes any mode transitions from boost-only or buck-only to hybrid modes as seen in competing H-bridge converters. The ...

Page 10

High-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter FAULT TIMEOUT P1 OFF (ASYNCHRONOUS N1 FROM ANYWHERE) SLOW CHARGE/ DISCHARGE P1 N1 OFF FAST DISCHARGE P2 P1 OFF ...

Page 11

High-Efficiency, Seamless Transition, or oscillation between the boost and buck modes as seen in other step-up/down converters. See the switch- ing waveforms for each of the three modes and transi- tion waveforms in the Typical Operating Characteristics section. Forced-PWM Mode ...

Page 12

High-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter Applications Information Selecting the Output Voltage The MAX8625A output is nominally fixed at 3.3V. Connect FB to GND to select the internally fixed-output voltage. For an adjustable output voltage, connect FB to the center ...

Page 13

High-Efficiency, Seamless Transition, INPUT 2.7V TO 5.5V C1, C2 22µF MODE SELECTION INPUT ON OFF C5 0.1µF Figure 4. Typical Application Circuit (Fixed 3.3V Output) Chip Information PROCESS: BiCMOS ______________________________________________________________________________________ Step-Up/Down DC-DC Converter L 3.3µ LX1 ...

Page 14

High-Efficiency, Seamless Transition, Step-Up/Down DC-DC Converter For the latest package outline information and land patterns www.maxim-ic.com/packages. 14 ______________________________________________________________________________________ Package Information (continued) ...

Page 15

High-Efficiency, Seamless Transition, For the latest package outline information and land patterns www.maxim-ic.com/packages. COMMON DIMENSIONS SYMBOL MIN. MAX. A 0.70 0.80 D 2.90 3.10 E 2.90 3.10 A1 0.00 0.05 L 0.20 0.40 k 0.25 MIN. A2 0.20 ...

Page 16

... 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. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products ...

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