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New Product Briefs – Power and Thermal Management
These innovative products are fully released. With production quantities normally available from stock, they are suitable for use in today's high-volume designs. Click on model numbers for data sheets and other information.
Prices, where indicated here, are recommended resale prices in U.S. dollars, were correct as of the date of release, and are subject to change without notice. For specific price quotations, please contact our sales offices or distributors.
All brand or product names mentioned are trademarks or registered trademarks of their respective holders.
May 2007
Quad Voltage Monitor and Sequencer
The
ADM1185
four-channel voltage monitor and sequencer monitors one primary supply and
three secondary supplies, enables or disables three external voltage
regulators in a predefined sequence, and generates a
power good signal when all power
supplies are up and stable. Voltages are compared to a 0.6-V ± 0.8%
reference; trip points are set by external resistors, and turn-on delays are
set by external capacitors. Operating on a single 2.7-V to 5.5-V supply, the
ADM1185 consumes only 24 μA.
Available in a 10-lead MSOP package, it is specified from –40ºC to 85ºC and
priced at $1.20 in 1000s.
Micropower Linear Regulator provides 50 mA output current
The
ADP1720
micropower low-dropout regulator is optionally available with fixed output
voltages of 3.3 V or 5 V, or an adjustable output that can be set between
0.8 V and 5 V with an external resistance divider. Featured specifications
include ±0.5% initial accuracy, 275-mV dropout voltage, and 50-mA load
current capability. Designed for robust operation, the device includes
current limiting, short-circuit protection, and thermal-overload protection.
Operating on a single 4-V to 28-V supply, the ADP1720 consumes only 28 μA.
Available in an 8-lead MSOP package, it is specified from –40ºC to 125ºC and
priced from $0.41 in 1000s.
March 2007
Low-Dropout Regulators can handle 300-mA loads
The
ADP1712/ADP1713/ADP1714
low-dropout regulators are available in 16 fixed output-voltage options from
0.75 V to 3.3 V. Features include
±1% initial accuracy,
170‑mV dropout voltage, 300-mA load-current capability, 72-dB power-supply
rejection, and 1-μA
shutdown current. The robust
design includes current limiting, short-circuit protection, thermal-overload
protection, and an internal soft-start circuit. The
ADP1712 is available in fixed- and adjustable voltage versions. The
fixed version allows a programmable soft-start time; the output voltage of
the adjustable version can be set between 0.8 V and 5 V with an external
resistive divider. The ADP1713 provides a bypass pin;
connecting an external capacitor to this pin reduces output noise and
improves power-supply rejection. The
ADP1714 includes a tracking feature, which allows its output to follow
an external voltage. Operating on a 2.5-V to 5.5-V supply, the ADP1712/13/14
consume 85 μA max with a 100-μA load and 420 μA max with a 300-mA load.
Available in 5-lead TSOT packages, they are specified from –40°C to 125°C
and priced from $0.64 in 1000s.
January 2007
Dual-interface flash/torch LED Driver provides high power, high efficiency, and small size
The ADP1653 high-efficiency driver provides a high-power output—up to 200 mA in torch mode, and up to 500 mA in flash mode—to drive the white LED used in digital still cameras, camcorders, and cell phone cameras. Its 92% efficiency and dynamic current control enhance flash brightness and picture quality. The dual-mode interface is compatible with 2-bit logic or I2C. The LED drive current is shut down less than 50 μs after RF transmission begins, reducing battery overstress and maximizing flash brightness. The robust design incorporates multiple safety features, including soft start, flash timeout, output-current limiting, over-temperature protection, and over-voltage protection. The ADP1653 operates with a single 2.75‑V to 5.5-V supply. Available in a 16-lead LFCSP package, it is specified from –40ºC to 125ºC and priced at $1.45 in 1000s.
Low-Dropout Regulators can handle 150-mA loads
The
ADP1710 and
ADP1711
low-dropout regulators are available with 16 fixed output-voltage options
from 0.75 V to 3.3 V. Features include ±1% initial accuracy, 150-mV dropout
voltage, 150-mA load-current capability, 69-dB power-supply rejection, and
1-μA shutdown current. An adjustable version of the ADP1710 is
also available; its output can be set to voltages from 0.8 V to 5 V with an
external resistive divider. An external capacitor can be connected to the
bypass pin on the ADP1711, reducing output noise and improving
power-supply rejection. The robust design includes current limiting,
short-circuit protection, and thermal-overload protection; an internal
soft-start circuit maintains a typical 24-μs startup time. Operating on
a
2-/3-/4-phase Synchronous Buck Converter uses 6-bit VID code
The
ADP3194 multiphase
synchronous buck controller converts the 12-V main supply into the core
supply voltage required by high-performance Intel processors. Reading a
6-bit voltage-identification code (VID), it sets the output voltage to
values between 0.8375 V and 1.6000 V with ±9.5-mV accuracy. It provides
short-circuit protection, adjustable current-limiting, and active
current-balancing between phases. A delayed Power-Good output allows
on-the-fly output voltage changes. Programmable no-load-offset- and slope
functions allow the output voltage to be adjusted as a function of load
current, optimally positioning it to deal with system transients. The phase
relationships of the output signals can be programmed to provide 2-, 3-, or
4-phase operation. Operating with a 4.75‑V to 5.25-V supply, the ADP3194
consumes 20 mA. Available in a 28-lead TSSOP package, it is specified from
0°C to 85°C and priced at $0.96 in 1000s.
2-/3-/4-phase Synchronous Buck Converter uses 6-bit VID code
The
ADP3196 multiphase
synchronous buck controller converts the 12-V main supply into the core
supply voltage required by high-performance AMD processors. Reading a 6-bit
voltage-identification code (VID), it sets the output voltage to values
between 0.3750 V and 1.5500 V with ±10-mV accuracy. It provides
short-circuit protection, adjustable current-limiting, and active
current-balancing between phases. A delayed Power-Good output allows
on-the-fly output-voltage changes. Programmable no-load offset- and slope
functions allow the output voltage to be adjusted as a function of load
current, optimally positioning it to deal with system transients. The phase
relationships of the output signals can be programmed to provide 2-, 3-, or
4-phase operation. Operating with a 4.65‑V to 5.55-V supply, the ADP3196
consumes 25 mA. Available in a 40-lead LFCSP package, it is specified from
0°C to 85°C and priced at $1.39 in 1000s.
November 2006
Hot Swap Controllers monitor supply voltage and current
The
ADM1175,
ADM1176,
ADM1177, and
ADM1178 hot-swap controllers integrate a
current-sense amplifier, 12-bit A/D converter, and I2C interface
to provide digital monitoring of the current through an external sense
resistor and the voltage on the power supply pin. They can also control the
gate of an external N-channel FET to keep the current through the sense
resistor below a preset limit. An under-voltage comparator enables the FET
controller, allowing safe hot-swapping of boards in live backplanes. Each
member of the family adds a unique function: the ADM1175 includes a
convert input, allowing multiple devices to be synchronized; the
ADM1176 includes a second address input, allowing up to 16
devices to share a common bus; the ADM1177 includes a soft-start
input, allowing the user to set the profile of the start-up ramp; and the
ADM1178 includes an alert output, allowing operation to be
interrupted if an over-current condition were to occur. Operating on a
Digital Power Monitors provide over-current alert
The
ADM1191 and
ADM1192 digital power monitors digitize the voltage on the
power supply pin and the current through an external sense resistor; the
12-bit results, communicated through an I2C interface, allow
power to be calculated by an external microcontroller. The voltage on the
output of the current-sense amplifier is compared to a set-point voltage,
and an alert is generated if the sensed current grows too large. The
ADM1191 includes a convert pin that can be used to synchronize
multiple devices; 16 devices can share a single bus. The ADM1192 includes a
timer pin that can be used to implement a hot-swap circuit; 4 devices can
share a single bus. Measurements can: occur continuously, be initiated by I2C
commands, or be triggered by the convert input. Operating on a 3.15-V
to 26-V supply, the devices consume 1.7 mA. Available in 10-lead MSOP
packages, they are specified from
Low-Dropout Regulators can handle 500-mA loads
The
ADP1715 and
ADP1716 low-dropout regulators are available with 16
optional choices of fixed output voltage, from 0.75 V to 3.3 V. Features
include ±1% initial accuracy, 250-mV dropout voltage, 500-mA load-current
capability, 60-dB power-supply rejection, and 1-μA shutdown current.
An adjustable version of the ADP1715 is also available; its output
can be set to voltages from 0.8 V to 5 V with an external resistive
divider. Its fixed-voltage versions have an adjustable soft-start
period; the adjustable-voltage version has a fixed 24-μs startup ramp. The
ADP1716 includes a tracking input that limits the output
voltage, forcing it to track an external supply voltage. The devices’
robust design includes current limiting, short-circuit protection, and
thermal-overload protection. Operating on a 2.5-V to
2-/3-phase Synchronous Buck Converter uses 8-bit VID code
The
ADP3199 multiphase synchronous buck controller converts the 12-V main
supply into the core supply voltage required by high-performance Intel
processors. It reads an 8-bit voltage-identification code (VID) and sets the
output voltage to values between 0.5000 V and 1.6000 V, with ±11-mV
accuracy. It provides short-circuit protection, adjustable current-limiting,
and active current-balancing between phases. A delayed Power-Good
output allows on-the-fly output-voltage changes. Programmable no-load-offset
and slope functions allow the output voltage to be adjusted as a function of
load current, optimally positioning it to deal with system transients. The
phase relationships of the output signals can be programmed to provide 2- or
3-phase operation. Operating with a 4.75‑V to
October 2006
2-/3-phase Synchronous Buck Converter uses 8-bit VID code
The
ADP3193 multiphase synchronous buck controller converts the 12-V main
supply into the core supply voltage required by high-performance Intel
processors. It reads an 8-bit voltage-identification code (VID) and sets the
output voltage to values between 0.5000 V and 1.6000 V. It provides
short-circuit protection, adjustable current-limiting, and active
current-balancing between phases. A delayed Power-Good output allows
on-the-fly output-voltage changes. Programmable no-load-offset and slope
functions allow the output voltage to be adjusted as a function of load
current, optimally positioning it to deal with system transients. The phase
relationships of the output signals can be programmed to provide 2- or
3-phase operation. Operating with a 4.75‑V to 5.25-V supply, the ADP3193
consumes 25 mA. Available in a 32-lead LFCSP package, it is specified from
2-/3-/4-phase Synchronous Buck Converter uses 8-bit VID code
The
ADP3198 multiphase synchronous buck controller converts the 12-V main
supply into the core supply voltage required by high-performance Intel
processors. It reads an 8-bit voltage-identification code (VID) and sets the
output voltage to values between 0.5000 V and 1.6000 V with ±11-mV accuracy.
It provides short-circuit protection, adjustable current-limiting, and
active current-balancing between phases. A delayed Power-Good output
allows on-the-fly output voltage changes. Programmable no-load-offset and
slope functions allow the output voltage to be adjusted as a function of
load current, optimally positioning it to deal with system transients. The
phase relationships of the output signals can be programmed to provide 2-,
3-, or 4-phase operation. Operating with a 4.75‑V to 5.25-V supply, the
ADP3198 consumes 25 mA. Available in a 40-lead LFCSP package, it is
specified from
September 2006
Hot-Swap Controller with Soft-Start controls supply rails from 1.6 V to 16.5 V
The
ADM1170 hot-swap controller allows boards to be safely inserted into—and
removed from—a live backplane. A current-control loop monitors the
voltage
across an external sense resistor, and a charge pump drives the gate of an
external high-side N-channel FET to control a 1.6-V to 16.5-V power supply.
A soft-start input allows external control of the start-up profile.
Two versions are available to deal with over-current faults: the –1 option
will automatically try to restart in case the fault has cleared; the –2 will
latch off and stay off until reset. Operating with a single 2.7‑V to
16.5-V supply, the ADM1170 consumes 0.65 mA. Available in an 8-lead TSOT
package, it is specified from –40°C to 85°C and priced at $2.40 in 1000s.
Hot-Swap Controllers for supply rails from 2.7 V to 16.5 V
The
ADM1171 and
ADM1172 hot-swap controllers allow boards to be safely
inserted into—and removed from—a live backplane. A current-control loop
monitors the voltage across an external sense resistor, and a charge pump
drives the gate of an external high-side N-channel
FET
to control a 2.7-V to 16.5-V power supply. The ADM1171 includes a
soft start input that allows external control of the start-up profile;
it also provides a voltage proportional to the voltage across the current
shunt. The ADM1172 includes a comparator that can be used as a
power-fail-, overvoltage-, or undervoltage detector. Two versions are
available to deal with over-current faults: the –1 option will automatically
try to restart in case the fault has cleared, while the –2 will latch-off
and stay off until reset. Operating with a single 2.7‑V to 16.5-V supply,
the ADM1171/72 consume 0.65 mA. Available in 8-lead TSOT packages, they are
specified from –40°C to 85°C and priced at $2.50/$2.30 in 1000s.
Hot Swap Controller is housed in tiny 6-lead TSOT package
The
ADM4210 hot-swap
controller
allows boards to be safely inserted into—and removed from—a live backplane.
A current-control loop monitors the voltage across an external sense
resistor, and a charge pump drives the gate of an external high-side
N-channel FET to control a 2.7-V to 16.5-V power supply. Two versions are
available to deal with over-current faults: the –1 option will automatically
try to restart in case the fault has cleared, while the –2 will latch-off
and stay off until reset. Operating with a single 2.7‑V to 16.5-V supply,
the ADM4210 consumes 0.65 mA. Available in a 6-lead TSOT package, it is
specified from –40°C to
Power Supply Sequencers directly drive N-channel power FETs
The
ADM6819 and
ADM6820
simple
sequencers monitor a primary supply voltage and control an external
N-channel FET to enable or disable a secondary supply. The ADM6819,
which can monitor two primary supplies, has a fixed 300-ms timeout before
enabling the secondary supply; the ADM6820, which can monitor a
single supply, features a programmable timeout period. Multiple devices can
be cascaded if more than two voltages require sequencing. An on-chip charge
pump ensures full enhancement of the external FET. Operating with a single
2.95‑V to 5.5-V supply, the ADM6819/20 consume 0.35 mA. Available in a
6-lead SOT-23 package, it is specified from –40°C to 85°C and priced at
$1.20 in 1000s.
Step-up DC-to-DC Converter provides lossless current sensing
The
ADP1621 step-up dc-to-dc controller uses current-mode fixed-frequency
pulse-width modulation to convert an input voltage into a higher output
voltage
with ±1% accuracy and 92% efficiency. It can be
used in isolated or non-isolated flyback-, SEPIC-, and forward converter
topologies. A single external resistor sets the operating frequency from 100
kHz to 1.5 MHz, or the device can be synchronized to an external clock.
Soft-start circuitry prevents in-rush currents at start-up, and thermal
shutdown circuitry disables the gate driver to prevent damage that can occur
at high die temperatures. Operating with a 2.9‑V to 5.5-V supply, the
ADP1621 consumes 1.8 mA in normal mode and 1 μA in shutdown
mode. Available in a 10-lead MSOP package, it is specified from –40°C to
85°C and priced from $1.75 in 1000s.
Step-down DC-to-DC Converters provide 97% efficiency
The
ADP2105/ADP2106/ADP2107 step-down converters convert a 2.7-V-to-5.5-V
unregulated input voltage to a regulated output voltage as low as 0.8 V—or
as high as the input voltage—with 97% efficiency and 3% accuracy. At
medium-to-high load currents they use current-mode,
constant-frequency
pulse-width modulation for fast, stable recovery from load transients; under
light load conditions, they switch to pulse-frequency modulation to extend
battery life. The undervoltage lockout circuit prevents deep battery
discharge, and the programmable soft-start circuit allows quick start up
while limiting inrush currents. The ADP2105/06/07 provide 1.0-/1.5-/2.0-A
maximum output currents. Each model is available in four preset output
voltage options—3.3-V, 1.8-V, 1.5-V, 1.2-V—and an adjustable-output version.
They consume 30 μA during normal operation and 1 μA in shutdown mode.
Specified from
Multiphase Synchronous Buck Converter uses 8-bit VID code
The
ADP3192 multiphase synchronous buck controller converts the 12-V main
supply into the core supply voltage required by high-performance Intel
processors.
It reads an 8-bit voltage-identification code (VID) and sets the output
voltage to values between 0.5000 V and 1.6000 V. It provides short-circuit
protection, adjustable current-limiting, and active current-balancing
between phases. A delayed Power-Good output allows on-the-fly output
voltage changes. Programmable no-load-offset and slope functions allow the
output voltage to be adjusted as a function of load current, optimally
positioning it to deal with system transients. Operating with a 4.75‑V to
5.25-V supply, the ADP3192 consumes 25 mA. Available in a 40-lead LFCSP
package, it is specified from 0°C to 85°C and priced at $1.30 in 1000s.
July 2006
Dual 12-V MOSFET Driver has high-side bootstrap, output disable
The
ADP3110A dual high-voltage MOSFET driver is optimized for driving the
two external N‑channel MOSFETs used in the synchronous buck converters that
power desktop computers. A single PWM signal generates both FET drives,
providing non-overlapping drive signals and preventing shoot-through
current. An output disable input prevents rapid discharge during
system shutdown. Featuring 25-ns propagation delay and 30-ns transition
time, both drivers can handle 3000-pF loads. In addition, the high-side
driver can be bootstrapped to a floating supply to accommodate high slew
rates. Operating with a 4.15-V to 13.2-V power supply, plus a 4-V to 26-V
boost supply, the ADP3110A draws 2 mA. Specified from 0ºC to 85ºC, it is
available in an 8-lead SOIC package and is priced at $0.57 in 1000s.
2-/3-/4-phase Synchronous Buck Controller
The
ADP3191 synchronous buck controller can be used in 2-, 3-, or 4-phase
regulators to convert the 5-V or 12-V main supply into the core voltage
required by high-performance Intel processors. Reading a 6-bit
voltage-identification code (VID), it sets the output voltage to values
between 0.8375 V and 1.6000 V, with less than ±14.5-mV error over
temperature. It provides short-circuit protection, adjustable current
limiting, and active current balancing between phases. A delayed
power-good output allows on-the-fly output voltage changes.
Programmable no-load offset- and slope functions
allow the output voltage to be adjusted as a function of load
current, positioning it optimally to deal with system transients. The
ADP3191 operates with a 12‑V system supply and draws 20 mA; the
ADP3191A operates with a 5-V system supply and draws 7 mA. Available in
28‑lead QSOP and TSSOP packages, they are specified from 0°C to 85°C and are
priced from $0.82 in 1000s.
June 2006
Dual interleaved step-down DC-to-DC Controller with tracking
The
ADP1823 dual synchronous buck controller generates
two independent output voltages from a pair of 2.9-V to 20-V variable
inputs. Each channel can be configured to provide an output from 0.6 V to
85% of the input voltage. The outputs track the inputs to allow coincident-
or ratiometric tracking of a master supply during startup, shutdown, or
fault conditions. The two channels operate 180° out of phase, minimizing
stress and allowing the use of smaller, lower-cost passive components. The
ADP1823 switches at a pin-selectable fixed frequency of 300 kHz or 600 kHz,
or it can be synchronized to an external clock. Safe, predictable start-up
conditions are ensured by an adjustable soft-start circuit that
prevents inrush currents and an output reverse-current protection
circuit that minimizes output voltage swings. The lossless current-limiting
scheme reduces cost and improves efficiency. Operating with a 5.5-V to 2-V
supply, the ADP1823 consumes 1.5 mA in normal mode and 10 µA in
shutdown mode. Specified from –40°C to 85°C, it is available in a
32‑lead LFCSP package and priced at $2.10 in 1000s.
