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Analog Integrations Corporation

ADP1850 Datasheet Preview

ADP1850 Datasheet

DC-to-DC Synchronous Buck Controller

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Wide Range Input, Dual/Two-Phase, DC-to-DC
Synchronous BucwkwCw.oDantatSrheoetl4lUe.crom
ADP1850
FEATURES
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
capacitance
±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
Synchronization input
Thermal overload protection
Input undervoltage lockout (UVLO)
Available in 32-lead 5 mm × 5 mm LFCSP
APPLICATIONS
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
Consumer
Industrial and instrumentation
Healthcare and medical
GENERAL DESCRIPTION
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
immunity.
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.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.
TYPICAL OPERATION CIRCUIT
RRAMP1
VIN
RAMP1 VIN
ADP1850
EN1
EN2
VDL
VCCO
TRK1
TRK2
DH1
BST1
SW1
ILIM1
FB1
DL1
M1
L1
R11
M2
R12
VOUT1
PGOOD1
RCSG1
PGOOD2 PGND1
HI
LO
SYNC
FREQ
RRAMP2
RAMP2
VIN
COMP1
COMP2
SS1
SS2
AGND
DH2
BST2
SW2
ILIM2
FB2
DL2
PGND2
M3
L2
R21
RCSG2
M4
R22
VOUT2
Figure 1. Single Phase Circuit
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.




Analog Integrations Corporation

ADP1850 Datasheet Preview

ADP1850 Datasheet

DC-to-DC Synchronous Buck Controller

No Preview Available !

ADP1850
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Typical Operation Circuit................................................................ 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Simplified Block Diagram ............................................................... 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 12
Control Architecture.................................................................. 12
Oscillator Frequency .................................................................. 12
Modes of Operation ................................................................... 13
Synchronization.......................................................................... 13
Synchronous Rectifier and Dead Time ................................... 14
Input Undervoltage Lockout..................................................... 14
Internal Linear Regulator .......................................................... 14
Overvoltage Protection.............................................................. 14
Power Good................................................................................. 14
Short Circuit and Current Limit Protection ........................... 15
Shutdown Control ...................................................................... 15
Thermal Overload Protection................................................... 15
Applications Information .............................................................. 16
Setting the Output Voltage ........................................................ 16
Soft Start ...................................................................................... 16
Setting the Current Limit .......................................................... 16
REVISION HISTORY
11/10—Revision 0: Initial Version
www.DataSheet4U.com
Accurate Current Limit Sensing............................................... 17
Setting the Slope Compensation .............................................. 17
Setting the Current Sense Gain ................................................ 17
Input Capacitor Selection.......................................................... 18
Input Filter................................................................................... 18
Boost Capacitor Selection ......................................................... 18
Inductor Selection ...................................................................... 18
Output Capacitor Selection....................................................... 19
MOSFET Selection..................................................................... 19
Loop Compensation (Single Phase Operation) ..................... 21
Configuration and Loop Compensation (Dual-Phase
Operation)................................................................................... 22
Switching Noise and Overshoot Reduction............................ 22
Voltage Tracking......................................................................... 23
Indepdendent Power Stage Input Voltage............................... 24
PCB Layout Guidelines.................................................................. 25
MOSFETs, Input Bulk Capacitor, and Bypass Capacitor ...... 25
High Current and Current Sense Paths................................... 25
Signal Paths ................................................................................. 25
PGND Plane................................................................................ 25
Feedback and Current Limit Sense Paths ............................... 25
Switch Node ................................................................................ 26
Gate Driver Paths ....................................................................... 26
Output Capacitors ...................................................................... 26
Typical Operating Circuits ............................................................ 27
Outline Dimensions ....................................................................... 31
Ordering Guide .......................................................................... 31
Rev. 0 | Page 2 of 32


Part Number ADP1850
Description DC-to-DC Synchronous Buck Controller
Maker Analog Integrations Corporation
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