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MAX1763EEEMAXN/a36avai1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter
MAX1763EEEMAXIMN/a370avai1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter


MAX1763EEE ,1.5A, Low-Noise, 1MHz, Step-Up DC-DC ConverterELECTRICAL CHARACTERISTICS(CLK/SEL = ONB = FB = PGND = GND, ISET = REF, OUT = POUT, V = V = V = 3.6 ..
MAX1763EEE ,1.5A, Low-Noise, 1MHz, Step-Up DC-DC ConverterapplicationsDigital Cordless Hand-Heldthat require constant-frequency operation at all loadPhones I ..
MAX1763EEE+ ,1.5A, Low-Noise, 1MHz, Step-Up DC-DC ConverterELECTRICAL CHARACTERISTICS(CLK/SEL = ONB = FB = PGND = GND, ISET = REF, OUT = POUT, V = V = V = 3.6 ..
MAX1763EEE+ ,1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converterapplicationsthat require constant-frequency operation at all load Digital Cordless Hand-Heldcurrent ..
MAX1765EEE ,800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear RegulatorApplicationslimit functions to permit optimization of efficiency, exter-Wireless Handsets Personaln ..
MAX1765EEE+ ,800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear RegulatorApplicationslimit functions to permit optimization of efficiency, exter-Wireless Handsets Personaln ..
MAX4590CAE ,1.25 / Dual SPST / CMOS Analog SwitchesFeaturesThe MAX4580/MAX4590/MAX4600 dual analog switches' Low On-Resistance (1.25Ω max)feature low ..
MAX4590CAE+ ,1.25Ω, Dual SPST, CMOS Analog SwitchesMAX4580/MAX4590/MAX460019-1394; Rev 1; 6/031.25Ω, Dual SPST,CMOS Analog Switches
MAX4590EAE ,1.25 / Dual SPST / CMOS Analog Switchesapplications and arethe preferred solution over mechanical relays in automat- ' Rail-to-Rail Signal ..
MAX4590EAE+ ,1.25Ω, Dual SPST, CMOS Analog SwitchesELECTRICAL CHARACTERISTICS–Dual Supplies(V+ = +15V, V- = -15V, V = +5V, V = +2.4V, V = +0.8V, T = T ..
MAX4590EWE ,1.25 / Dual SPST / CMOS Analog SwitchesMAX4580/MAX4590/MAX460019-1394; Rev 0; 10/981.25Ω, Dual SPST,CMOS Analog Switches
MAX4591CPE ,High-Speed / Single-Supply / Quad / SPST Analog SwitchesApplicationsMAX4591CUE 0°C to +70°C 16 TSSOPMAX4591CSE 0°C to +70°C 16 Narrow SOTest Equipment Samp ..


MAX1763EEE
1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter
General Description
The MAX1763 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. This device maintains exception-
ally low quiescent supply current (110µA) despite its
high 1MHz operating frequency. Small external compo-
nents and a tiny package make this device an excellent
choice for small hand-held applications that require the
longest possible battery life.
The MAX1763 uses a synchronous-rectified pulse-
width-modulation (PWM) boost topology to generate
2.5V to 5.5V outputs from a wide range of input
sources, such as one to three alkaline or NiCd/NiMH
cells or a single Lithium-ion (Li+) cell. Maxim's propri-
etary Idle Mode™ circuitry significantly improves effi-
ciency at light load currents while smoothly transitioning
to fixed-frequency PWM operation at higher load cur-
rents to maintain excellent full-load efficiency. Low-
noise, forced-PWM mode is available for applications
that require constant-frequency operation at all load
currents. The MAX1763 may also be synchronized to
an external clock to protect sensitive frequency bands
in communications equipment.
The MAX1763 includes an on-chip linear gain block
that can be used to build a high-power external linear
regulator or as a low-battery comparator. Soft-start and
current limit functions permit optimization of efficiency,
external component size, and output voltage ripple.
The MAX1763 is available in a space-saving 16-pin
QSOP package or a high-power (1.5W) 16-pin TSSOP-
EP package.
Features
Up to 94% Efficiency+0.7V to +5.5V Input Voltage Range1.1V Guaranteed Startup Input VoltageUp to 1.5A OutputFixed 3.3V Output or Adjustable (2.5V to 5.5V)1MHz PWM Synchronous-Rectified Topology1µA Logic-Controlled ShutdownAnalog Gain Block for Linear-Regulator or Low-
Battery Comparator
Adjustable Current Limit and Soft-Start1.5W TSSOP Package Available
MAX1763
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
Pin Configuration

19-1698; Rev 1; 2/01
Ordering Information

*EP = Exposed pad
Idle Mode is a trademark of Maxim Integrated Products.
Digital Cordless
Phones
PCS Phones
Wireless Handsets
Hand-Held
Instruments
Palmtop Computers
Personal
Communicators
Typical Operating Circuit
________________________Applications
MAX1763
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(CLK/SEL = ONB= FB = PGND = GND, ISET = REF, OUT = POUT, VONA= VAIN= VOUT= 3.6V, TA= 0°C to +85°C, unless other-
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.
ONA, ONB, AO, OUT to GND.......................................0.3V, +6V
PGND to GND.....................................................................±0.3V
LX to PGND............................................-0.3V to (VPOUT+ 0.3V)
CLK/SEL, REF, FB, ISET, POUT,
AIN to GND.........................................-0.3V to (VOUT+ 0.3V)
POUT to OUT......................................................................±0.3V
Continuous Power Dissipation
16-Pin QSOP (derate 8.7mW/°C above +70°C)...........667mW
16-Pin TSSOP-EP (derate 19mW/°C above +70°C)...........1.5W
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
MAX1763
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)

(CLK/SEL = ONB= FB = PGND = GND, ISET = REF, OUT = POUT, VONA= VAIN= VOUT= 3.6V, TA= 0°C to +85°C, unless other-
MAX1763
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
ELECTRICAL CHARACTERISTICS

(CLK/SEL = ONB= FB = PGND = GND, ISET = REF, OUT = POUT, VONA= VAIN= VOUT= 3.6V, TA= -40°C to +85°C, unless other-
MAX1763
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)

(CLK/SEL = ONB= FB = PGND = GND, ISET = REF, OUT = POUT, VONA= VAIN= VOUT= 3.6V, TA= -40°C to +85°C, unless other-
Note 1:
Operating voltage. Because the regulator is bootstrapped to the output, once started, the MAX1763 will operate down to
0.7V input.
Note 2:
Startup is tested with the circuit of Figure 2.
Note 3:
Defines low-noise mode maximum step-up ratio.
Note 4:
The regulator is in startup mode until this voltage is reached. Do not apply full load current until the output exceeds 2.3V.
Note 5:
Supply current from the 3.3V output is measured between the 3.3V output and the OUT pin. This current correlates directly
to the actual battery-supply current, but is reduced in value according to the step-up ratio and efficiency. The gain block is
disabled.
Note 6:
Connect AIN to OUT to disable gain block.
Note 7:
ONA and ONBhave hysteresis of approximately 0.15 ✕VOUT.
Note 8:
Specifications to -40°C are guaranteed by design and not production tested.
MAX1763
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
Typical Operating Characteristics

(Circuit of Figure 2, VIN = +3.6V, VOUT = +5V, TA = +25°C, unless otherwise noted.)
MAX1763
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
LIGHT-LOAD SWITCHING WAVEFORMS

MAX1763 toc10
200ns/div
VIN = 1.1V, VOUT = 3.3V, IOUT = 20mA
A: LX NODE, 5V/div
B: INDUCTOR CURRENT, 0.1A/div, AC COUPLED
C: OUTPUT RIPPLE, 0.1V/div, AC COUPLED
LOAD-TRANSIENT RESPONSE

MAX1763 toc11
100µs/div
VIN = 2.4V, VOUT = 3.3V, IOUT = 0.2A TO 1.35A
A: IOUT, 0.5A/div
B: VOUT, 100mV/div, AC-COUPLED
LINE-TRANSIENT RESPONSE

MAX1763 toc12
40µs/div
VIN = 2.4V TO 1.4V, IOUT = 70mA
A: VIN, 1V/div
B: VOUT, 5mV/div, AC-COUPLED
POWER-ON DELAY

MAX1763 toc13
100µs/div
ONA
5V/div
IIN
0.5A/div
VOUT
2V/div
STARTUP WAVEFORMS
NO SOFT-START

MAX1763 toc14
2ms/div
VIN = 1.2V, VOUT = 3.3V, RLOAD = 3kΩ
VOUT
2V/div
ONA
5V/div
IIN
1A/div
STARTUP WAVEFORMS
USING SOFT-START

MAX1763 toc15
2ms/div
VIN = 1.2V, VOUT = 3.3V, RSS = 510kΩ, CSS = 0.1µF, RLOAD = 3kΩ
VOUT
2V/div
ONA
5V/div
IIN
1A/div
NOISE SPECTRUM

MAX1763 toc16
FREQUENCY (MHz)
NOISE (mV
RMS
Typical Operating Characteristics (continued)

(Circuit of Figure 2, VIN = +3.6V, VOUT = +5V, TA = +25°C, unless otherwise noted.)
MAX1763
Detailed Description

The MAX1763 is a highly-efficient, low-noise power
supply for portable RF and hand-held instruments. It
combines a boost switching regulator, N-channel
power MOSFET, P-channel synchronous rectifier, preci-
sion reference, shutdown control, and a versatile gain
block (Figure 1).
The DC-DC converter boosts a one-cell to three-cell
battery voltage input to a fixed 3.3V or adjustable volt-
diode is required for output voltages greater than 4V.
The MAX1763 guarantees startup with an input voltage
as low as 1.1V and remains operational down to an
input of just 0.7V. It is optimized for use in cellular
phones and other applications requiring low noise and
low quiescent current for maximum battery life. It fea-
tures constant-frequency (1MHz), low-noise PWM oper-
ation with up to 1.5A output capability. A CLK input
allows frequency synchronization to control the output
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
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