MAX1817EUB Maxim Integrated Products, MAX1817EUB Datasheet

IC CONV DUAL DCDC STEP 10-UMAX

MAX1817EUB

Manufacturer Part Number
MAX1817EUB
Description
IC CONV DUAL DCDC STEP 10-UMAX
Manufacturer
Maxim Integrated Products
Type
Step-Up (Boost)r
Datasheet

Specifications of MAX1817EUB

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
2
Voltage - Output
3.3V or Adj Main, -28 ~ 28 V or Adj Secondary
Current - Output
125mA
Frequency - Switching
500kHz
Voltage - Input
1.5 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Power - Output
444mW
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

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Part Number
Manufacturer
Quantity
Price
Part Number:
MAX1817EUB
Manufacturer:
MAXIM
Quantity:
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Part Number:
MAX1817EUB
Manufacturer:
MAXIM/美信
Quantity:
20 000
The MAX1817 is a compact, high-efficiency, dual-out-
put step-up converter for portable devices that pro-
vides both the main logic supply and the LCD bias. The
device operates from an input voltage of +1.5V to
+5.5V, allowing the use of 2- or 3-cell alkaline batteries,
or 1-cell lithium-ion (Li+) batteries.
The MAX1817’s main regulator supplies 125mA at
either a preset 3.3V or an adjustable 2.5V to 5.5V out-
put voltage with up to 88% efficiency. A 0.1µA shut-
down state also minimizes battery drain. The
MAX1817’s secondary step-up converter provides the
LCD bias voltage and is adjustable up to +28V.
Other features include a fast switching frequency to
reduce the size of external components and a low qui-
escent current to maximize battery life. Both outputs can
be independently shut down for improved flexibility.
The MAX1817 is supplied in a compact 10-pin µMAX
package. The MAX1817 evaluation kit (MAX1817EVKIT)
is available to speed up design.
19-1794 Rev 0; 10/00
________________________Applications
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
TO +5.5V
+1.5V
Organizers/Translators
PDAs
MP3 Players
GPS Receivers
MAIN ON/OFF
LCD ON/OFF
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
ONLCD
ON
AGND
LX
MAX1817
Compact, High-Efficiency, Dual-Output
General Description
LXLCD
FBLCD
GND
OUT
FB
LCD
MAIN
Step-Up DC-DC Converter
o Dual Step-Up Converter in a Tiny 10-Pin µMAX
o Main Output
o LCD Output
o Input Voltage Range +1.5V to +5.5V
o Minimal External Components Required
o 0.1µA Logic-Controlled Shutdown
o Low 15µA Quiescent Supply Current
MAX1817EUB
Package
Up to 125mA Load Current
Fixed 3.3V or Adjustable 2.5V to 5.5V
Up to 88% Efficiency
Internal Switch
Up to 28V for LCD Bias
Internal Switch
TOP VIEW
PART
ONLCD
FBLCD
AGND
ON
FB
1
2
3
4
5
TEMP. RANGE
-40°C to +85°C
Ordering Information
MAX1817
µMAX
Pin Configuration
10
9
8
7
6
OUT
LX
GND
LXLCD
N.C.
PIN-PACKAGE
10 µMAX
Features
1

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MAX1817EUB Summary of contents

Page 1

... Up to 88% Efficiency Internal Switch o LCD Output Up to 28V for LCD Bias Internal Switch o Input Voltage Range +1.5V to +5.5V o Minimal External Components Required o 0.1µA Logic-Controlled Shutdown o Low 15µA Quiescent Supply Current PART MAX1817EUB TOP VIEW FB ON LCD ONLCD FBLCD AGND MAIN Features Ordering Information TEMP ...

Page 2

... V IN Load Regulation I LOAD LX On-Resistance V OUT LX Current Limit Dual Mode is a trademark of Maxim Integrated Products. 2 _______________________________________________________________________________________ Operating Temperature Range ...........................-40°C to +85°C + 0.3V) Junction Temperature ......................................................+150°C OUT Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C RMS = 0° ...

Page 3

Compact, High-Efficiency, Dual-Output ELECTRICAL CHARACTERISTICS (continued +3.3V GND ONLCD OUT PARAMETER LX Leakage Current V ON Input Low Voltage 1.8V < Input High Voltage 1.8V < ...

Page 4

Compact, High-Efficiency, Dual-Output Step-Up DC-DC Converter ELECTRICAL CHARACTERISTICS (continued +3.3V GND ONLCD OUT PARAMETER FB Dual Mode Threshold Outp tag ustm ent Rang e ...

Page 5

Compact, High-Efficiency, Dual-Output (Circuit of Figure +25°C, unless otherwise noted.) A MAIN OUTPUT EFFICIENCY vs. LOAD CURRENT 3.3V 2.4V OUT OUT ...

Page 6

Compact, High-Efficiency, Dual-Output Step-Up DC-DC Converter (Circuit of Figure +25°C, unless otherwise specified) A MAIN LOAD TRANSIENT RESPONSE 0 400µs/div 100mV/div, AC-COUPLED OUT 50mA/div LOAD, OUT V = 2.4V ...

Page 7

Compact, High-Efficiency, Dual-Output PIN NAME Main Output Feedback Input. Connect FB to GND for fixed 3.3V main output. For other output 1 FB voltages, use a resistive voltage-divider to set the output voltage. The feedback regulation voltage is 1.25V at ...

Page 8

Compact, High-Efficiency, Dual-Output Step-Up DC-DC Converter V IN DUAL-MODE FEEDBACK FB 75mV SHUTDOWN ON ON LOGIC OFF MAIN UNDERVOLTAGE LOCKOUT SHUTDOWN ON ONLCD LOGIC OFF LCD MAX1817 Figure 1. MAX1817 Simplified Functional Diagram the output voltage rises above the undervoltage ...

Page 9

Compact, High-Efficiency, Dual-Output 10µF L1 10µ 10µ LXLCD 4.7pF C4 ON OFF LCD ONLCD FBLCD ON OFF MAX1817 ON OUT MAIN R3 300k FB R4 100k AGND GND Figure 2. Setting Main Output ...

Page 10

Compact, High-Efficiency, Dual-Output Step-Up DC-DC Converter R3 L1,10µ 10µF L2 10µ D1** LXLCD R1 240k MAX1817 ONLCD FBLCD ON OUT C3 22µF FB AGND GND *D3 CENTRAL SEMICONDUCTOR CMPD7000 DUAL **D1 = ...

Page 11

Compact, High-Efficiency, Dual-Output loss in efficiency. Choose a reverse breakdown voltage greater than the output voltage. Input Bypass Capacitor The input supplies high currents to the inductors and requires local bulk bypassing close to the inductors. A low equivalent series ...

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 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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