MAX1951ESA+T Maxim Integrated Products, MAX1951ESA+T Datasheet

IC REG PWM 2A 8-SOIC

MAX1951ESA+T

Manufacturer Part Number
MAX1951ESA+T
Description
IC REG PWM 2A 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX1952ESA.pdf (15 pages)

Specifications of MAX1951ESA+T

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.8 ~ 5.5 V
Current - Output
2A
Frequency - Switching
1MHz
Voltage - Input
2.6 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Power - Output
976mW
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1951/MAX1952 high-efficiency, DC-to-DC
step-down switching regulators deliver up to 2A of out-
put current. The devices operate from an input voltage
range of 2.6V to 5.5V and provide an output voltage
from 0.8V to V
for on-board postregulation applications. The MAX1951
total output error is less than 1% over load, line, and
temperature.
The MAX1951/MAX1952 operate at a fixed frequency of
1MHz with an efficiency of up to 94%. The high operating
frequency minimizes the size of external components.
Internal soft-start control circuitry reduces inrush current.
Short-circuit and thermal-overload protection improve
design reliability.
The MAX1951 provides an adjustable output from 0.8V
to V
1.8V. Both devices are available in a space-saving 8-pin
SO package.
19-2622; Rev 2; 6/09
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.
IN
TOP VIEW
, whereas the MAX1952 has a preset output of
ASIC/DSP/µP/FPGA Core and I/O Voltages
Set-Top Boxes
Cellular Base Stations
Networking and Telecommunications
IN
GND
V
REF
CC
FB
, making the MAX1951/MAX1952 ideal
2A PWM Step-Down DC-to-DC Regulators
________________________________________________________________ Maxim Integrated Products
1
2
4
3
1MHz, All-Ceramic, 2.6V to 5.5V Input,
General Description
MAX1951
MAX1952
SO
Pin Configuration
Applications
6
8
7
5
IN
LX
PGND
COMP
♦ Compact 0.385in
♦ 10µF Ceramic Input and Output Capacitors, 2µH
♦ Efficiency Up to 94%
♦ 1% Output Accuracy Over Load, Line, and
♦ Guaranteed 2A Output Current
♦ Operate from 2.6V to 5.5V Supply
♦ Adjustable Output from 0.8V to V
♦ Preset Output of 1.8V (1.5% Accuracy) (MAX1952)
♦ Internal Digital Soft-Soft
♦ Short-Circuit and Thermal-Overload Protection
+Denotes a lead(Pb)-free/RoHS-compliant package.
MAX1951ESA+ -40°C to +85°C 8 SO
MAX1952ESA+ -40°C to +85°C 8 SO
Inductor for 1.5A Output
Temperature (MAX1951, Up to 1.5A)
ON
PART
OFF
2.6V TO 5.5V
INPUT
OPTIONAL
Typical Operating Circuit
TEMP RANGE
2
IN
COMP
V
Ordering Information/
Circuit Footprint
CC
PGND
MAX1951
GND
PIN-
PACKAGE
Selector Guide
REF
FB
LX
IN
(MAX1951)
0.8V TO V
Features
Adj 0.8V to V
Fixed 1.8V
OUTPUT
OUTPUT
IN
, UP TO 2A
IN
1

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MAX1951ESA+T Summary of contents

Page 1

... MAX1952 GND ________________________________________________________________ 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. ♦ Compact 0.385in ♦ 10µF Ceramic Input and Output Capacitors, 2µH Inductor for 1.5A Output ♦ Efficiency Up to 94% ♦ ...

Page 2

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators ABSOLUTE MAXIMUM RATINGS IN GND ........................................................-0.3V to +6V CC COMP, FB, REF to GND .............................-0. Current (Note 1).........................................................±4.5A PGND to GND .............................................Internally Connected ...

Page 3

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators ELECTRICAL CHARACTERISTICS (continued 3.3V, PGND = GND regulation +25°C.) A PARAMETER On-Resistance, ...

Page 4

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators ELECTRICAL CHARACTERISTICS (continued 3.3V, PGND = GND regulation PARAMETER COMP COMP Transconductance From FB to COMP, V COMP Clamp Voltage, ...

Page 5

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators (Typical values are 5V EFFICIENCY vs. LOAD CURRENT ( 5V 100 V = 3.3V OUT 90 ...

Page 6

All Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators (Typical values are 5V SWITCHING WAVEFORMS 0A 0V 200ns/div SOFT-START WAVEFORMS 1ms/div 6 _______________________________________________________________________________________ Typical Operating Characteristics (continued) = 1.5V, ...

Page 7

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators Pin Description PIN NAME FUNCTION Supply Voltage. Bypass capacitor to ground and 10Ω resistor to IN. Reference Bypass. Bypass REF with 0.1µF 2 REF capacitor ...

Page 8

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators V CC RAMP GEN COMP Figure 1. Functional Diagram through the high-side MOSFET body diode, back to the input, until the beginning of the next cycle or until the ...

Page 9

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators Design Procedure Output Voltage Selection: Adjustable (MAX1951) or Preset (MAX1952) The MAX1951 provides an adjustable output voltage between 0.8V and V . Connect FB to output for 0.8V IN ...

Page 10

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators Typical Operating Characteristics), the controller responds by regulating the output voltage back to its nominal state. The controller response time depends on the closed-loop bandwidth. A higher bandwidth yields ...

Page 11

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators gmc = 4. 1MHz SWITCH 1.5V/1 1Ω LOAD OUT OUT(MAX [1/(2π MOD ...

Page 12

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators 2.6V TO 5.5V C1 10μF C2 220pF Figure 2a. MAX1951 Adjustable Output Typical Application Circuit 2.6V TO 5.5V C1 10μF C2 220pF Figure 2b. MAX1952 Fixed-Output Typical Application Circuit ...

Page 13

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators 3.3V ±5% C1 10μF L1: TOKO A915AY-1R1M C1: TAIYO YUDEN JMK316BJ106ML C4: TAIYO YUDEN JMK325BJ226MM Figure 2c. MAX1951 Typical Application Circuit with 2A Output ______________________________________________________________________________________ 10Ω ...

Page 14

All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators Table 2. External Components List ...

Page 15

... 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 ____________________ 15 © 2009 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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