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MAX710ESEMAXIMN/a40avai3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters
MAX711ESEMAXIMN/a586avai3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters


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MAX710ESE-MAX711ESE
3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters
_______________General Description
The MAX710/MAX711 integrate a step-up DC-DC con-
verter with a linear regulator to provide step-up/down
voltage conversion. They are optimized for battery
applications where the input varies above and below
the regulated output voltage. They have an input range
from +1.8V to +11V. Typical efficiency when boosting
battery inputs is 85%.
The MAX710/MAX711 can be configured for minimum
noise or optimum efficiency. Shutdown control turns off
the part completely, disconnecting the input from the
output (ISHDN= 0.2µA). Standby control turns off only
the step-up converter and leaves the low-power linear
regulator active (IQ= 7µA).
The MAX710 has a preset 3.3V or 5V output voltage.
The MAX711 has an adjustable output that can be set
from +2.7V to +5.5V with two resistors. Both devices
come in 16-pin narrow SO packages.
________________________Applications

Single-Cell, Lithium-Powered Portable Devices
Digital Cameras
2- to 4-Cell AA Alkaline Hand-Held Equipment
3.3V and Other Low-Voltage Systems
2-, 3-, and 4-Cell Battery-Powered Equipment
Battery-Powered Devices with AC Input Adapters
____________________________Features
Step-Up/Down Voltage Conversion+1.8V to +11V Input RangeOutput:
5V/250mA at VIN= 1.8V
5V/500mA at VIN= 3.6V
No External FETs RequiredLoad Disconnected from Input in ShutdownBattery Drain:
200µA No-Load (VIN= 4V)
7µA in Standby
0.2µA when Off
Low-Noise and High-Efficiency Modes
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
__________________Pin Configuration
__________Typical Operating Circuit
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VPS= 5.6V, STBY= PS, CREF= 0.1µF, COUT= 4.7µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at = +25°C.) (Note 1)
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.
PS, LX, OUT to GND............................................-0.3V to +11.5V
ILIM, SHDN, STBY, FB, 3/5, N/E, LBO,
LBI-, LBI+, REF to GND...........................-0.3V to (VPS+ 0.3V)
PGND to GND.......................................................-0.3V to +0.3V
REF Short Circuit to GND...........................................Continuous
IOUT...................................................................................700mA
Continuous Power Dissipation (TA= +70°C)
SO (derate 8.70mW/°C above +70°C)..........................696mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)

(VPS= 5.6V, STBY= PS, CREF= 0.1µF, COUT= 4.7µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at = +25°C.) (Note 1)
Note 1:
Specifications at -40°C are guaranteed by design, not production tested.
Note 2:
Guaranteed by design (see Table 1).
Note 3:
The LBO comparator provides the correct result as long as one input is within the specified input range.
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
____________________________Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)
_______________Detailed Description
The MAX710/MAX711 integrate a step-up DC-DC con-
verter with a linear regulator to provide step-up/down
voltage conversion. The step-up switch-mode regulator
contains an N-channel power MOSFET switch. It also
shares a precision voltage reference with a linear regu-
lator that contains a P-channel MOSFET pass element
(Figure 1).
Step-Up Operation

A pulse-frequency-modulation (PFM) control scheme
with a constant 1µs off-time and variable on-time con-
trols the N-channel MOSFET switch. The N-channel
switch turns off when the part reaches the peak current
limit or the 4µs maximum on-time. The ripple frequency
is a function of load current and input voltage.
Step-Down Operation

The low-dropout linear regulator consists of a refer-
ence, an error amplifier, and a P-channel MOSFET. The
reference is connected to the error amplifier’s inverting
input. The error amplifier compares this reference with
the selected feedback voltage and amplifies the differ-
ence. The difference is conditioned and applied to the
P-channel pass transistor’s gate.
Operating Configurations

The MAX710/MAX711 have several operating configu-
rations to minimize noise and optimize efficiency for dif-
ferent input voltage ranges. These configurations are
accomplished via the N/Einput, which controls opera-
tion of the on-chip linear regulator.
With N/Elow, the linear regulator behaves as a 0.7Ω(at
5V output) PFET switch when the IC is boosting, and as
a conventional linear regulator when VIN> VOUT. This
provides optimum boost efficiency, but the PFET does
little to reject boost-converter output ripple. With N/E
high, boost ripple rejection is optimized by maintaining
headroom (VFV, typically 0.5V at 5V output) across the
linear regulator. Boost mode efficiency is then about
10% lower than with N/Ehigh.
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
______________________________________________________________Pin Description
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