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MAX1771CPAMAXIM ?N/a124avai12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
MAX1771CSAMAXAMN/a100avai12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
MAX1771CSAN/a154avai12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
MAX1771CSAMAX ?N/a155avai12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
MAX1771CSAMAXN/a890avai12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
MAX1771CSAMAXIMN/a994avai12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
MAX1771CSAMAXIM ?N/a128avai12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
MAX1771EPAMAXIMN/a3avai12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
MAX1771ESAMAXIM ?N/a85avai12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
MAX1771ESAMAXIMN/a300avai12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller


MAX1771CSA ,12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC ControllerFeaturesThe MAX1771 step-up switching controller provides ' 90% Efficiency for 30mA to 2A Load Curr ..
MAX1771CSA ,12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC ControllerFeaturesThe MAX1771 step-up switching controller provides ' 90% Efficiency for 30mA to 2A Load Curr ..
MAX1771CSA ,12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC ControllerELECTRICAL CHARACTERISTICS(V+ = 5V, I = 0mA, T = T to T , unless otherwise noted. Typical values ar ..
MAX1771CSA ,12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC ControllerMAX177119-0263; Rev 1; 7/9512V or Adjustable, High-Efficiency, Low I , Step-Up DC-DC ControllerQ___ ..
MAX1771CSA ,12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC ControllerApplications__________________Pin ConfigurationPortable Communicators__________Typical Operating Ci ..
MAX1771CSA ,12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC ControllerFeaturesThe MAX1771 step-up switching controller provides ' 90% Efficiency for 30mA to 2A Load Curr ..
MAX4601CAE+ ,2.5Ω, Quad, SPST, CMOS Analog SwitchesMAX4601/MAX4602/MAX460319-3961; Rev 0; 1/992.5W , Quad, SPST, CMOS Analog Switches
MAX4601EAE ,2.5 / Quad / SPST / CMOS Analog SwitchesFeaturesThe MAX4601/MAX4602/MAX4603 quad analog switches' Low On-Resistance (2.5W max)feature low o ..
MAX4601EAE+ ,2.5Ω, Quad, SPST, CMOS Analog SwitchesFeaturesThe MAX4601/MAX4602/MAX4603 quad analog switches' Low On-Resistance (2.5W max)feature low o ..
MAX4602CAE ,2.5 / Quad / SPST / CMOS Analog Switchesapplications' Guaranteed ESD Protection > 2000V perwhere current switching is required. They have l ..
MAX4602CAE+ ,2.5Ω, Quad, SPST, CMOS Analog SwitchesApplicationsMAX4601CPE 0°C to +70°C 16 Plastic DIPMAX4601EAE -40°C to +85°C 16 SSOPReed Relay Repla ..
MAX4602EAE ,2.5 / Quad / SPST / CMOS Analog SwitchesELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = +15V, V- = -15V, V = 5V, V = 2.4V, V = 0.8V, T = T to ..


MAX1771CPA-MAX1771CSA-MAX1771EPA-MAX1771ESA
12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
_______________General Description
The MAX1771 step-up switching controller provides
90% efficiency over a 30mA to 2A load. A unique cur-
rent-limited pulse-frequency-modulation (PFM) control
scheme gives this device the benefits of pulse-width-
modulation (PWM) converters (high efficiency at heavy
loads), while using less than 110µA of supply current (vs.
2mA to 10mA for PWM converters).
This controller uses miniature external components. Its
high switching frequency (up to 300kHz) allows sur-
face-mount magnetics of 5mm height and 9mm diame-
ter. It accepts input voltages from 2V to 16.5V. The
output voltage is preset at 12V, or can be adjusted
using two resistors.
The MAX1771 optimizes efficiency at low input voltages
and reduces noise by using a single 100mV current-limit
threshold under all load conditions. A family of similar
devices, the MAX770–MAX773, trades some full-load
efficiency for greater current-limit accuracy; they provide
a 200mV current limit at full load, and switch to 100mV
for light loads.
The MAX1771 drives an external N-channel MOSFET
switch, allowing it to power loads up to 24W. If less power
is required, use the MAX756/MAX757 or MAX761/MAX762
step-up switching regulators with on-board MOSFETs.
An evaluation kit is available. Order the MAX1771EVKIT-SO.
________________________Applications

Positive LCD-Bias Generators
Flash Memory Programmers
High-Power RF Power-Amplifier Supply
Palmtops/Hand-Held Terminals
Battery-Powered Applications
Portable Communicators
____________________________Features
90% Efficiency for 30mA to 2A Load CurrentsUp to 24W Output Power110µA Max Supply Current5µA Max Shutdown Current2V to 16.5V Input RangePreset 12V or Adjustable Output VoltageCurrent-Limited PFM Control SchemeUp to 300kHz Switching FrequencyEvaluation Kit Available
______________Ordering Information
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
________________________________________________________________Maxim Integrated Products1
__________________Pin Configuration
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.

19-0263; Rev 1; 7/95
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883B.
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS

Supply Voltage
V+ to GND...............................................................-0.3V, 17V
EXT, CS, REF, SHDN, FB to GND...................-0.3V, (V+ + 0.3V)
GND to AGND.............................................................0.1V, -0.1V
Continuous Power Dissipation (TA= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C)............727mW
SO (derate 5.88mW/°C above +70°C).........................471mW
CERDIP (derate 8.00mW/°C above +70°C).................640mW
Operating Temperature Ranges
MAX1771C_A.....................................................0°C to +70°C
MAX1771E_A..................................................-40°C to +85°C
MAX1771MJA................................................-55°C to +125°C
Junction Temperatures
MAX1771C_A/E_A.......................................................+150°C
MAX1771MJA..............................................................+175°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+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

(V+ = 5V, ILOAD= 0mA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
_______________________________________________________________________________________3
ELECTRICAL CHARACTERISTICS (continued)

(V+ = 5V, ILOAD= 0mA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
Note 1:
Output voltage guaranteed using preset voltages. See Figures 4a–4d for output current capability versus input voltage.
Note 2:
Output voltage line and load regulation depend on external circuit components.
__________________________________________Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)
1001010010,0001000
EFFICIENCY vs. LOAD CURRENT(BOOTSTRAPED MODE)

LOAD CURRENT (mA)
EFFICIENCY (
MAX1771–01
1001010010,0001000EFFICIENCY vs. LOAD CURRENT
(NON-BOOTSTRAPED MODE)

LOAD CURRENT (mA)
EFFICIENCY (
MAX1771–02
LOAD CURRENT vs.
MINIMUM START-UP INPUT VOLTAGE
MAX1771-TOC3
MINIMUM START-UP INPUT VOLTAGE (V)
LOAD CURRENT (mA)
2.252.502.753.003.253.50
REFERENCE OUTPUT RESISTANCE vs.
TEMPERATURE
MAX1771-07
TEMPERATURE (°C)
REFERENCE OUTPUT RESISTANCE (100
REFERENCE vs. TEMPERATURE
MAX1771-08
TEMPERATURE (°C)
REFERENCE (V)100-4008040120
MAXIMUM SWITCH ON-TIME vs.TEMPERATURE
TEMPERATURE (°C)
tON(MAX) (µs)
MAX1771-09
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller_______________________________________________________________________________________

SHUTDOWN CURRENT vs. TEMPERATURE
MAX1771-10
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)100-4008040120
MINIMUM SWITCH OFF-TIME vs.
TEMPERATURE
TEMPERATURE (°C)
tOFF(MIN) (µs)
MAX1771-11
MAXIMUM SWITCH ON-TIME/MINIMUM SWITCH OFF-TIME RATIO
vs. TEMPERATURE
TEMPERATURE (°C)
tON(MAX)/
tOFF(MIN) RATIO
MAX1771-127.5
____________________________Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
MAX1771-04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
MAX1771-05
EXT RISE/FALL TIME vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
EXT RISE/FALL TIME (ns)
MAX1771-06
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
_______________________________________________________________________________________5
____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 2a, TA = +25°C, unless otherwise noted.)
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller_______________________________________________________________________________________
______________________________________________________________Pin Description
____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 2a, TA = +25°C, unless otherwise noted.)
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller
_______________________________________________________________________________________7
_______________Detailed Description

The MAX1771 is a BiCMOS, step-up, switch-mode pow-
er-supply controller that provides a preset 12V output,
in addition to adjustable-output operation. Its unique
control scheme combines the advantages of pulse-fre-
quency modulation (low supply current) and pulse-
width modulation (high efficiency with heavy loads),
providing high efficiency over a wide output current
range, as well as increased output current capability
over previous PFM devices. In addition, the external
sense resistor and power transistor allow the user to tai-
lor the output current capability for each application.
Figure 1 shows the MAX1771 functional diagram.
The MAX1771 offers three main improvements over
prior pulse-skipping control solutions: 1) the converter
operates with miniature (5mm height and less than
9mm diameter) surface-mount inductors due to its
300kHz switching frequency; 2) the current-limited PFM
control scheme allows 90% efficiencies over a wide
range of load currents; and 3) the maximum supply
current is only 110µA.
The device has a shutdown mode that reduces the
supply current to 5µA max.
Bootstrapped/Non-Bootstrapped Modes

Figure 2 shows the standard application circuits for
bootstrapped and non-bootstrapped modes. In boot-
strapped mode, the IC is powered from the output
(VOUT, which is connected to V+) and the input voltage
range is 2V to VOUT. The voltage applied to the gate of
the external power transistor is switched from VOUTto
ground, providing more switch gate drive and thus
reducing the transistor’s on-resistance.
In non-bootstrapped mode, the IC is powered from the
input voltage (V+) and operates with minimum supply
current. In this mode, FB is the output voltage sense
point. Since the voltage swing applied to the gate of the
external power transistor is reduced (the gate swings
from V+ to ground), the power transistor’s on-resistance
Figure 1. Functional Diagram
MAX1771
12V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controller_______________________________________________________________________________________

increases at low input voltages. However, the supply
current is also reduced because V+ is at a lower volt-
age, and because less energy is consumed while
charging and discharging the external MOSFET’s gate
capacitance. The minimum input voltage is 3V when
using external feedback resistors. With supply voltages
below 5V, bootstrapped mode is recommended.
Note: When using the MAX1771 in non-boot-
strapped mode, there is no preset output operation
because V+ is also the output voltage sense point
for fixed-output operation. External resistors must
be used to set the output voltage.
Use 1% external
feedback resistors when operating in adjustable-output
mode (Figures 2b, 2c) to achieve an overall output volt-
age accuracy of ±5%. To achieve highest efficiency,
operate in bootstrapped mode whenever possible.
External Power-Transistor
Control Circuitry
PFM Control Scheme

The MAX1771 uses a proprietary current-limited PFM
control scheme to provide high efficiency over a wide
range of load currents. This control scheme combines the
ultra-low supply current of PFM converters (or pulse skip-
pers) with the high full-load efficiency of PWM converters.
Unlike traditional PFM converters, the MAX1771 uses a
sense resistor to control the peak inductor current. The
device also operates with high switching frequencies
(up to 300kHz), allowing the use of miniature external
components.
As with traditional PFM converters, the power transistor
is not turned on until the voltage comparator senses
the output is out of regulation. However, unlike tradition-
al PFM converters, the MAX1771 switch uses the com-
bination of a peak current limit and a pair of one-shots
that set the maximum on-time (16µs) and minimum off-
time (2.3µs); there is no oscillator. Once off, the mini-
mum off-time one-shot holds the switch off for 2.3µs.
After this minimum time, the switch either 1) stays off if
the output is in regulation, or 2) turns on again if the
output is out of regulation.
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