Dual Output Synchronous Buck PWM
Controller With Tracking
ADP1877
output voltage accuracy of 0.85% from 0°C to 85°C and 1.5%
from −40°C to 125°C in junction temperature. This part can be
powered from a 2.75 V to 14.5 V supply, operates over the
−40oC to +125oC junction temperature range, and is available
in a 32-lead 5 mm × 5 mm LFCSP package.
FEATURES
Input voltage range: 2.75 V to 14.5 V
Output voltage range: 0.6 V to 0.9 V
Maximum output current 20 A or higher per channel
Programmable frequency: 200 kHz to 1.5 MHz
Flexmode® architecture with integrated drivers
180° phase shift minimizes input ripple current and required
input capacitance
VIN
R
AMP1
RAMP1
VIN
M1
0.85ꢀ output voltage accuracy 0°C to 70°C
Integrated boost diodes
EN1
EN2
VDL
L1
DH1
BST1
VOUT1
Pulse skip high efficiency mode under light load
Power good with internal pull-up resistor
Overvoltage and overcurrent limit protection
Thermal overload protection
Input undervoltage lockout (UVLO)
Externally adjustable soft start, slope compensation and
current sense gain
SW1
ILIM1
FB1
R
TOP1
VCCO
PGOOD1
PGOOD2
M2
M3
DL1
PGND1
RAMP2
R
BOT1
TRK1
TRK2
R
CSG1
SYNC
FREQ
R
RAMP2
VIN
L2
Independent precision enable inputs
Synchronization input
COMP1
COMP2
DH2
BST2
VOUT2
Suitable for any output capacitors
Available in 32-lead 5 mm × 5 mm LFCSP
SW2
ILIM2
FB2
R
TOP2
M4
SS1
SS2
DL2
R
BOT2
APPLICATIONS
R
CSG2
AGND
Set top boxes
PGND2
Printers
Communication infrastructure
Distributor power dc systems
Industrial and instrumentation
Figure 1. Typical Operation Circuit
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
= 3.3V PSM
O
GENERAL DESCRIPTION
V
= 1.8V PSM
O
The ADP1877 is a Flexmode® (proprietary architecture of
Analog Devices, Inc.), dual-channel, step-down switching
controller with integrated drivers that drive N-channel
synchronous power MOSFETs. The two PWM outputs are
phase shifted 180°, which reduces the input RMS current, thus
minimizing required input capacitance.
V
= 3.3V PWM
O
V
= 1.8V PWM
O
The boost diodes are built into the ADP1877, thus lowering the
overall system cost and component count. The ADP1877 can
be set to operate in pulse skip high efficiency mode under light
load or in PWM continuous conduction mode.
V
= 12V, 300kHz
IN
0.01
0.1
1
10
100
LOAD (A)
The ADP1877 includes externally adjustable soft start, output
overvoltage protection, externally adjustable current limit,
power good, and a programmable oscillator frequency that
ranges from 200 kHz to 1.5 MHz. The ADP1877 provides an
Figure 2. Efficiency Plot of Figure 42, 20 A Output
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. Trademarks and registered trademarks are the property of their respective
owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2009 Analog Devices, Inc. All rights reserved.
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