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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1817 Datasheet

Compact / High-Efficiency / Dual-Output Step-Up DC-DC Converter

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MAX1817 pdf
19-1794 Rev 0; 10/00
Compact, High-Efficiency, Dual-Output
Step-Up DC-DC Converter
General Description
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.
________________________Applications
Organizers/Translators
PDAs
MP3 Players
GPS Receivers
Features
o Dual Step-Up Converter in a Tiny 10-Pin µMAX
Package
o Main Output
Up to 125mA Load Current
Fixed 3.3V or Adjustable 2.5V to 5.5V
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
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
Typical Operating Circuit
+1.5V
TO +5.5V
LCD ON/OFF
LX LXLCD
ONLCD FBLCD
MAIN ON/OFF
MAX1817
ON
AGND
OUT
FB
GND
LCD
MAIN
Pin Configuration
TOP VIEW
FB 1
ON 2
ONLCD 3
FBLCD 4
AGND 5
MAX1817
µMAX
10 OUT
9 LX
8 GND
7 LXLCD
6 N.C.
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1817 Datasheet

Compact / High-Efficiency / Dual-Output Step-Up DC-DC Converter

No Preview Available !

MAX1817 pdf
Compact, High-Efficiency, Dual-Output
Step-Up DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
OUT to GND .............................................................-0.3V to +6V
ON, ONLCD, FB, FBLCD, LX to GND ......-0.3V to (VOUT + 0.3V)
LXLCD to GND .......................................................-0.3V to +30V
AGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
LXLCD, LX Maximum Current ........................................0.5ARMS
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VON = VONLCD = VOUT = +3.3V, FB = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
GENERAL
Input Voltage Range
Startup Voltage
Quiescent Current from OUT
(Main Only)
Quiescent Current from OUT
Shutdown Quiescent Current
MAIN OUTPUT
OUT Undervoltage Lockout
Fixed-Mode Output Voltage
Adjustable-Mode FB Regulation
Voltage
FB Input Bias Current
FB Dual ModeTM Threshold
CONDITIONS
RLOAD = 35
RLOAD = , VFB = 1.35V
VFB = VFBLCD = 1.35V,
VONLCD = 0
VFB = VFBLCD = 1.35V
VON = VONLCD = 0
VOUT rising, VFB = 1.35V
VOUT falling, VFB = 1.35V
VFB 45mV
VFB = 1.35V
MIN TYP MAX UNITS
1.5 5.5 V
1.5
1.2 1.55
V
5 10 µA
15 30
0.1 1
µA
µA
1.95
3.14
1.20
45
2.2
2.15
3.3
1.25
75
2.4
3.47
1.30
50
105
V
V
V
nA
mV
Output Voltage Adjustment
Range
Maximum LX On-Time
Zero Crossing Comparator
Threshold (VLX - VOUT)
VFB = 0.5V
2.5 5.5 V
2.4 5 7.5 µs
0 20 40 mV
Zero Crossing Comparator
Backup Timer
VFB = +0.5V
22 45 70 µs
Line Regulation
IOUT = 100mA,
VIN = +2V to +3V
1.6 %
Load Regulation
LX On-Resistance
LX Current Limit
VIN = +2.5V,
ILOAD = 10mA to 100mA
VOUT = 3.3V, ILX = 100mA
1.6
0.35 0.65
0.5 0.75 1.05
%
A
Dual Mode is a trademark of Maxim Integrated Products.
2 _______________________________________________________________________________________


Part Number MAX1817
Description Compact / High-Efficiency / Dual-Output Step-Up DC-DC Converter
Maker Maxim
Total Page 12 Pages
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