MAX1836ETT50+T Maxim Integrated Products, MAX1836ETT50+T Datasheet

IC DC-DC CONV 5V 6-TDFN

MAX1836ETT50+T

Manufacturer Part Number
MAX1836ETT50+T
Description
IC DC-DC CONV 5V 6-TDFN
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet

Specifications of MAX1836ETT50+T

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
4.8 ~ 5.2 V
Current - Output
125mA
Voltage - Input
4.5 ~ 24 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
6-TDFN Exposed Pad
Power - Output
1.95W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Frequency - Switching
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
The MAX1836/MAX1837 high-efficiency step-down
converters provide a preset 3.3V or 5V output voltage
from supply voltages as high as 24V. Using external
feedback resistors, the output voltage may be adjusted
from 1.25V to V
MOSFET delivers load currents up to 125mA
(MAX1836) or 250mA (MAX1837).
The unique current-limited control scheme, operating
with duty cycles up to 100%, minimizes the dropout
voltage (120mV at 100mA). Additionally, this control
scheme reduces supply current under light loads to
12µA. High switching frequencies allow the use of tiny
surface-mount inductors and output capacitors.
The MAX1836/MAX1837 step-down converters with
internal switching MOSFETs are available in 6-pin
SOT23 and 3mm x 3mm TDFN packages, making them
ideal for low-cost, low-power, space-sensitive applica-
tions. For increased output drive capability, use the
MAX1776 step-down converter that uses an internal
24V switch to deliver up to 500mA. For even higher cur-
rents, use the MAX1626/ MAX1627 step-down con-
trollers that drive an external P-channel MOSFET to
deliver up to 20W.
19-1919; Rev 3; 7/06
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.
NOTE: HIGH-CURRENT PATHS SHOWN WITH BOLD LINES.
INPUT
4.5V TO 24V
9V Battery Systems
Notebook Computers
Distributed Power Systems
Backup Supplies
4mA to 20mA Loop Power Supplies
Industrial Control Supplies
Handheld Devices
IN
GND
SHDN
Typical Operating Circuit
IN
. An internal current-limited switching
________________________________________________________________ Maxim Integrated Products
MAX1836
MAX1837
24V Internal Switch, 100% Duty Cycle,
General Description
OUT
LX
FB
Applications
3.3V OR 5V
OUTPUT
♦ 4.5V to 24V Input Voltage Range
♦ Preset 3.3V or 5V Output
♦ Adjustable Output from 1.25V to V
♦ Output Currents Up to 125mA (MAX1836) or
♦ Efficiency Over 90%
♦ 12µA Quiescent Current
♦ 3µA Shutdown Current
♦ 100% Maximum Duty Cycle for Low Dropout
♦ Small 6-Pin SOT23 and TDFN Packages
____________________________Features
*EP = Exposed pad.
Selector Guide appears at end of data sheet.
MAX1836ETT33-T
MAX1836ETT50-T
MAX1836EUT33-T
MAX1836EUT50-T
MAX1837ETT33-T
MAX1837ETT50-T
MAX1837EUT33-T
MAX1837EUT50-T
TOP VIEW
Step-Down Converters
GND
250mA (MAX1837)
FB
IN
PART
1
2
3
MAX1836
MAX1837
SOT23
-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
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
6
5
4
Ordering Information
OUT
SHDN
LX
Pin Configurations
GND
FB
IN
1
2
3
PIN-
PACKAGE
6 TDFN-EP*
6 TDFN-EP*
6 SOT23-6
6 SOT23-6
6 TDFN-EP*
6 TDFN-EP*
6 SOT23-6
6 SOT23-6
MAX1836
MAX1837
IN
TDFN
6
5
4
MARK
AANW
AANY
AANZ
AANX
TOP
AJG
AJE
AJH
AJF
OUT
SHDN
LX
1

Related parts for MAX1836ETT50+T

MAX1836ETT50+T Summary of contents

Page 1

... OUT MAX1836 MAX1837 GND FB NOTE: HIGH-CURRENT PATHS SHOWN WITH BOLD LINES. ________________________________________________________________ Maxim Integrated Products 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. Step-Down Converters ____________________________Features ♦ 4.5V to 24V Input Voltage Range ♦ Preset 3. Output ♦ ...

Page 2

... OFF( M IN) LX Switch Maximum On-Time Switch On-Resistance LX Current Limit LX Zero-Crossing Threshold Dual Mode is a trademark of Maxim Integrated Products, Inc. 2 _______________________________________________________________________________________ Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C + 0.3V) IN Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C ...

Page 3

Internal Switch, 100% Duty Cycle, ELECTRICAL CHARACTERISTICS (continued) (Circuits of Figures 1 (MAX1836) and 2 (MAX1837), V unless otherwise noted.) PARAMETER SYMBOL Zero-Crossing Timeout LX Switch Leakage Current Dropout Voltage V DROPOUT Line Regulation Load Regulation Shutdown Input Threshold ...

Page 4

Internal Switch, 100% Duty Cycle, Step-Down Converters ELECTRICAL CHARACTERISTICS (continued) (Circuits of Figures 1 (MAX1836) and 2 (MAX1837), V PARAMETER SYMBOL LX Zero-Crossing Threshold Shutdown Input Threshold V Shutdown Leakage Current I Note 2: When using the shutdown input, ...

Page 5

Internal Switch, 100% Duty Cycle, (Circuits of Figures 1 (MAX1836) and 2 (MAX1837), V MAX1837EUT33 EFFICIENCY vs. INPUT VOLTAGE 100 FIGURE 3.3V OUT 47µ 200mA OUT ...

Page 6

Internal Switch, 100% Duty Cycle, Step-Down Converters (Circuits of Figures 1 (MAX1836) and 2 (MAX1837), V MAX1837EUT50 LOAD TRANSIENT 400mA 200mA 0 5.02V 5.00V 4.98V 750mA 250mA 0 100µs/div 10mA to 250mA, 200mA/div OUT B: V ...

Page 7

Internal Switch, 100% Duty Cycle, PIN NAME Dual-Mode Feedback Input. Connect to GND for the preset 3.3V (MAX183_EUT33) or 5.0V (MAX183_EUT50) output. Connect to a resistive divider between the output and FB to adjust the output voltage between 1.25V ...

Page 8

Internal Switch, 100% Duty Cycle, Step-Down Converters INPUT 4.5V OR 24V SHDN R S MAX1836 MAX1837 Figure 3. Functional Diagram When the output voltage is too low, an error comparator sets a flip-flop, which turns on ...

Page 9

Internal Switch, 100% Duty Cycle, Input-Output (Dropout) Voltage A step-down converter’s minimum input-to-output volt- age differential (dropout voltage) determines the lowest useable input supply voltage. In battery-powered sys- tems, this limits the useful end-of-life battery voltage. To maximize battery ...

Page 10

Internal Switch, 100% Duty Cycle, Step-Down Converters The inductor’s saturation current rating must be greater than the peak switching current, which is determined by the switch current limit plus the overshoot due to the 300ns current-sense comparator propagation delay: ...

Page 11

Internal Switch, 100% Duty Cycle, Table 1. Component Suppliers SUPPLIER INDUCTORS Coilcraft Coiltronics Sumida USA Toko CAPACITORS AVX Kemet Panasonic Sanyo Taiyo Yuden DIODES Central Semiconductor International Nihon On Semiconductor Zetex MAX1836/MAX1837 Stability Commonly, instability is caused by excessive ...

Page 12

Internal Switch, 100% Duty Cycle, Step-Down Converters INPUT 4.5V TO 24V SHDN 10µF 25V OUT MAX1837 GND TAIYO YUDEN TMK432BJ106KM SUMIDA CDRH5D28-470 C = SANYO POSCAP 10TPC68M OUT D1 ...

Page 13

Internal Switch, 100% Duty Cycle, (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.) ______________________________________________________________________________________ Step-Down Converters Package Information PACKAGE OUTLINE, SOT 6L BODY 21-0058 ...

Page 14

Internal Switch, 100% Duty Cycle, Step-Down Converters (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.) 14 ______________________________________________________________________________________ Package Information (continued) PACKAGE OUTLINE, 6,8,10 & ...

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 © 2006 Maxim Integrated Products ...

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