Wide Range Input, Dual/Two-Phase, DC-to-DC
Synchronous Buck Controller
Wide range input: 2.75 V to 20 V
Power stage input voltage: 1 V to 20 V
Output voltage range: 0.6 V up to 90% VIN
Output current to more than 25 A per channel
Accurate current sharing between channels (interleaved)
Programmable frequency: 200 kHz to 1.5 MHz
180° phase shift between channels for reduced input
±0.85% reference voltage accuracy from −40°C to +85°C
Integrated boost diodes
Power saving mode (PSM) at light loads
Accurate power good with internal pull-up resistor
Accurate voltage tracking capability
Independent channel precision enable
Overvoltage and overcurrent limit protection
Externally programmable soft start, slope compensation and
current sense gain
Thermal overload protection
Input undervoltage lockout (UVLO)
Available in 32-lead 5 mm × 5 mm LFCSP
High current single and dual output intermediate bus and
point of load converters requiring sequencing and
tracking capability, including converters for:
Point-of-load power supplies
Telecom base station and networking
Industrial and instrumentation
Healthcare and medical
The ADP1850 is a configurable dual output or two-phase, single
output dc-to-dc synchronous buck controller capable of running
from commonly used 3.3 V to 12 V (up to 20 V) voltage inputs.
The device operates in current mode for improved transient
response and uses valley current sensing for enhanced noise
The architecture enables accurate current sharing between
interleaved phases for high current outputs.
The ADP1850 is ideal in system applications requiring multiple
output voltages: the ADP1850 includes a synchronization fea-
ture to eliminate beat frequencies between switching devices;
provides accurate tracking capability between supplies and
includes precision enable for simple, robust sequencing.
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rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
TYPICAL OPERATION CIRCUIT
Figure 1. Single Phase Circuit
The ADP1850 provides high speed, high peak current drive
capability with dead-time optimization to enable energy
efficient power conversion. For low load operation, the device
can be configured to operate in power saving mode (PSM) by
skipping pulses and reducing switching losses to improve the
energy efficiency at light load and standby conditions.
The accurate current limit (±6%) allows the power architect to
design within a narrower range of tolerances and can reduce
overall converter size and cost.
The ADP1850 provides a configurable architecture capable
of wide range input operation to provide the designer with
maximum re-use opportunities and improved time to market.
Additional flexibility is provided by external programmability
of loop compensation, soft start, frequency setting, power
saving mode, current limit and current sense gain can all be
programmed using external components.
The ADP1850 includes a high level of integration in a small size
package. The start-up linear regulator and the boot-strap diode
for the high side drive are included. Protection features include:
undervoltage lock-out, overvoltage, overcurrent/short-circuit
and over temperature. The ADP1850 is available in a compact
32-lead LFCSP 5 mm × 5 mm thermally enhanced package.
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