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MAX1817EUB maxim 美信芯片 电子元器件中文版规格手册.pdf
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MAX1817EUB maxim 美信芯片 电子元器件中文版规格手册
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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
♦ Dual Step-Up Converter in a Tiny 10-Pin µMAX
Package
♦ Main Output
Up to 125mA Load Current
Fixed 3.3V or Adjustable 2.5V to 5.5V
Up to 88% Efficiency
Internal Switch
♦ LCD Output
Up to 28V for LCD Bias
Internal Switch
♦ Input Voltage Range +1.5V to +5.5V
♦ Minimal External Components Required
♦ 0.1µA Logic-Controlled Shutdown
♦ Low 15µA Quiescent Supply Current
MAX1817
Compact, High-Efficiency, Dual-Output
Step-Up DC-DC Converter
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
5
10
9
8
7
6
OUT
LX
GND
LXLCDFBLCD
ONLCD
ON
FB
MAX1817
µ
MAX
TOP VIEW
N.C.AGND
Pin Configuration
MAX1817
LX
ONLCD
ON
FB
OUT
FBLCDLCD ON/OFF
+1.5V
TO +5.5V
MAIN ON/OFF MAIN
LCD
AGND GND
LXLCD
Typical Operating Circuit
19-1794 Rev 0; 10/00
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX1817EUB -40°C to +85°C 10 µMAX
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.
MAX1817
Compact, High-Efficiency, Dual-Output
Step-Up DC-DC Converter
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
ON
= V
ONLCD
=V
OUT
= +3.3V, FB = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°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.
OUT to GND .............................................................-0.3V to +6V
ON, ONLCD, FB, FBLCD, LX to GND ......-0.3V to (V
OUT
+ 0.3V)
LXLCD to GND .......................................................-0.3V to +30V
AGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
LXLCD, LX Maximum Current ........................................0.5A
RMS
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
PARAMETER CONDITIONS MIN TYP MAX UNITS
GENERAL
Input Voltage Range 1.5 5.5 V
R
LOAD
= 35Ω 1.5
Startup Voltage
R
LOAD
= ∞, V
FB
= 1.35V 1.2 1.55
V
Quiescent Current from OUT
(Main Only)
V
FB
= V
FBLCD
= 1.35V,
V
ONLCD
= 0
510µA
Quiescent Current from OUT V
FB
= V
FBLCD
= 1.35V 15 30 µA
Shutdown Quiescent Current V
ON
= V
ONLCD
= 0 0.1 1 µA
MAIN OUTPUT
V
OUT
rising, V
FB
= 1.35V 2.2 2.4
OUT Undervoltage Lockout
V
OUT
falling, V
FB
= 1.35V 1.95 2.15
V
Fixed-Mode Output Voltage V
FB
≤ 45mV 3.14 3.3 3.47 V
Adjustable-Mode FB Regulation
Voltage
1.20 1.25 1.30 V
FB Input Bias Current V
FB
= 1.35V 50 nA
FB Dual Mode
TM
Threshold 45 75 105 mV
Output Voltage Adjustment
Range
2.5 5.5 V
Maximum LX On-Time V
FB
= 0.5V 2.4 5 7.5 µs
Zero Crossing Comparator
Threshold (V
LX
- V
OUT
)
02040mV
Zero Crossing Comparator
Backup Timer
V
FB
= +0.5V 22 45 70 µs
Line Regulation
I
OUT
= 100mA,
V
IN
= +2V to +3V
1.6 %
Load Regulation
V
IN
= +2.5V,
I
LOAD
= 10mA to 100mA
1.6 %
LX On-Resistance V
OUT
= 3.3V, I
LX
= 100mA 0.35 0.65 Ω
LX Current Limit 0.5 0.75 1.05 A
Dual Mode is a trademark of Maxim Integrated Products.
MAX1817
Compact, High-Efficiency, Dual-Output
Step-Up DC-DC Converter
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
ON
= V
ONLCD
= V
OUT
= +3.3V, FB = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
LX Leakage Current V
ON
= GND, V
LX
= 5.5V 0.1 1 µA
ON Input Low Voltage 1.8V < V
OUT
< 5.5V, V
FB
= 0.5V 400 mV
ON Input High Voltage 1.8V < V
OUT
< 5.5V, V
FB
= 0.5V 1.6 V
ON Input Bias Current 1µA
LCD OUTPUT
LXLCD Voltage 28 V
LXLCD On-Resistance V
OUT
= 3.3V, I
LXLCD
= 100mA 1.1 2.0 Ω
LXLCD Current Limit 0.28 0.5 0.7 A
LXLCD Leakage Current V
LXLCD
= 28V, V
ONLCD
= 0 0.1 1 µA
FBLCD Regulation Voltage 1.20 1.25 1.30 V
FBLCD Input Bias Current V
FBLCD
= 1.35V 50 nA
LCD Line Regulation I
LOAD
= 5mA, V
IN
= +2V to +3V 0.1 %
LCD Load Regulation I
LOAD
= 1mA to 5mA, V
IN
= +2.5V 0.5 %
Maximum LXLCD On-Time 4 9 14 µs
V
FBLCD
≥ 1.2V 0.5 1 1.5
Minimum LXLCD Off-Time
V
FBLCD
≤ 0.7V 2.4 5 7.5
µs
ONLCD Input Low Voltage 2.5V < V
OUT
< 5.5V 400 mV
ONLCD Input High Voltage 2.5V < V
OUT
< 5.5V 1.6 V
ONLCD Input Bias Current 1µA
ELECTRICAL CHARACTERISTICS
(V
ON
= V
ONLCD
= V
OUT
= +3.3V, FB = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER CONDITIONS MIN MAX UNITS
GENERAL
Input Voltage Range 1.5 5.5 V
Startup Voltage R
LOAD
= ∞, V
FB
= 1.35V 1.7 V
Quiescent Current from OUT
(Main Only)
V
FB
= V
FBLCD
= 1.35V, V
ONLCD
= 0 10 µA
Quiescent Current from OUT V
FB
= V
FBLCD
= 1.35V 30 µA
Shutdown Quiescent Current V
ON
= V
ONLCD
= 0 1 µA
MAIN OUTPUT
V
OUT
rising, V
FB
= 1.35V 2.4
OUT Undervoltage Lockout
V
OUT
falling, V
FB
= 1.35V 1.95
V
Fixed-Mode Output Voltage V
FB
≤ 45mV 3.14 3.47 V
Adjustable-Mode FB Regulation
Voltage
1.20 1.30 V
FB Input Bias Current V
FB
= 1.35V 50 nA
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