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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1677 Datasheet

Compact / High-Efficiency / Dual-Output Step-Up and LCD Bias DC-DC Converter

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19-1403; Rev 1; 3/01
EVAALVUAAILTAIOBNLEKIT
Compact, High-Efficiency, Dual-Output
Step-Up and LCD Bias DC-DC Converter
General Description
The MAX1677 is a compact, high-efficiency, dual-out-
put boost converter for portable devices needing two
regulated supplies, typically for logic and liquid crystal
displays (LCDs). Operation with inputs as low as 0.7V
allows the MAX1677 to accept 1, 2, or 3-cell alkaline,
NiCd, or NiMH batteries as well as 1-cell lithium-ion bat-
teries. The device requires no external FETs and can
maintain regulation while consuming only 20µA, making
it ideal for hand-held pen-input and PDA devices oper-
ating with low-current “sleep” states.
The MAX1677’s primary regulator supplies up to
350mA at either a factory-preset 3.3V or an adjustable
2.5V to 5.5V output. On-chip synchronous rectification
provides efficiencies up to 95%. 300kHz (or externally
clocked) pulse-width-modulation (PWM) operation is
particularly suitable for applications needing low noise,
such as those with wireless features. The primary con-
verter also features pin-selectable pulse-frequency-
modulation (PFM) operation that consumes only 20µA.
A 1µA shutdown state also minimizes battery drain.
The MAX1677’s secondary step-up converter supplies up
to +28V or -28V for LCD bias, varactor tuning, or other
high-voltage, low-current functions. Other MAX1677 fea-
tures include precision reference, logic control inputs for
both regulators, and an uncommitted comparator for
low-battery detection or a reset function. The MAX1677
is supplied in Maxim’s compact 16-pin QSOP package,
which occupies no more space than a standard SO-8.
Applications
PDAs
Hand-Held Terminals
Portable Phones
Portable Instruments
Pin Configuration
TOP VIEW
OUT 1
FB 2
LBI 3
LBO 4
CLK/SEL 5
LCDON 6
LCDPOL 7
REF 8
MAX1677
QSOP
16 POUT
15 LX
14 PGND
13 LCDGND
12 LCDLX
11 ON
10 LCDFB
9 GND
Features
o No External FETs Required
o Main Output
Up to 350mA for Logic Supply
Fixed 3.3V or Adjustable (2.5V to 5.5V)
Synchronous Rectification for High Efficiency
(up to 95%)
300kHz (200kHz to 400kHz Synchronizable)
Fixed-Frequency PWM Operation
o Secondary Output
Up to +28V or -28V for LCD Bias
Programmable Current Limit
o 0.7V to 5.5V Input Voltage Range
o 20µA Quiescent Current
o 1µA Shutdown Current
o Low-Battery Comparator
o Small 16-Pin QSOP Package
PART
MAX1677EEE
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
16 QSOP
Typical Operating Circuit
VIN = 0.7V to 5.5V
(UP TO MAINOUT)
OFF
PFM
OFF
-VE OUT
ON
PWM
ON
+VE OUT
LX POUT
MAX1677
LCDLX
OUT
LBI LBO
LCDON
CLK/SEL
ON
LCDPOL
PGND
LCDFB
REF
FB
LCDGND
GND
3.3V MAIN
BOOST OUTPUT
±28V
LCD
BOOST
OUTPUT
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1677 Datasheet

Compact / High-Efficiency / Dual-Output Step-Up and LCD Bias DC-DC Converter

No Preview Available !

Compact, High-Efficiency, Dual-Output
Step-Up and LCD Bias DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
OUT, LCDON, ON, POUT, LBI, LBO,
LX to GND .............................................................-0.3V to +6V
CLK/SEL, LCDPOL, REF, LCDFB,
FB to GND .............................................-0.3V to (VOUT + 0.3V)
LCDLX to GND .......................................................-0.3V to +30V
PGND, LCDGND to GND ......................................-0.3V to +0.3V
POUT to OUT.........................................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........696mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°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
(VOUT = 3.3V, CREF = 0.1µF, POUT = OUT, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
GENERAL
Input Voltage Range
Minimum Startup Voltage
Reference Voltage
Reference Load Regulation
Reference Line Rejection
Supply Current
Main DC On, LCD Off
SYMBOL
CONDITIONS
VIN
VSTARTUP
VREF
(Note 1)
TA = +25°C, ILOAD < 1mA
IREF = 0
IREF = 0 to 50µA (Note 2)
VOUT = 2.5V to 5.5V
ILCDOFF No load, current into OUT
MIN TYP MAX UNITS
0.7
1.23
0.9
1.25
2
0.2
20
5.5
1.1
1.27
15
5
40
V
V
V
mV
mV
µA
Supply Current All On,
Main DC-DC in PFM Mode
IPFM
No load, current into OUT
35 60
µA
Supply Current All On,
Main DC-DC in PWM Mode
Supply Current in Shutdown
MAIN BOOST DC-DC
Output Voltage
FB Regulation Voltage
FB Input Current
Output Voltage Adjustment
Range
IPWM No load, current into OUT
115 300
0.3 5
VOUT
VFB (REG)
IFB
FB = GND, 0 ILX 350mA,
CLK/SEL = OUT (Note 3)
Adjustable mode, CLK/SEL = OUT (Note 3)
VFB = 1.3V
3.20
1.225
2.5
3.30
1.25
0.02
3.43
1.275
50
5.5
µA
µA
V
V
nA
V
Startup to Normal Mode
Transition Voltage (Note 4)
Line Regulation
Load Regulation
Frequency in Startup Mode
LX Leakage Current
VLOCKOUT
fSTARTUP
ILX (LEAK)
IOUT = 150mA, VIN = 2V to 3V
CLK/SEL = OUT, VIN = 2.4V,
ILOAD = 10mA to 200mA
VOUT = 15V
2.1 2.4 V
0.6 %
1%
40 300 kHz
0.2 5
µA
2 _______________________________________________________________________________________


Part Number MAX1677
Description Compact / High-Efficiency / Dual-Output Step-Up and LCD Bias DC-DC Converter
Maker Maxim
Total Page 16 Pages
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