6.5 V, 4 A, High Efficiency,
Step-Down DC-to-DC Regulator
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4 A continuous output current
43 mΩ and 29 mΩ integrated FET
±1.5% output accuracy
Input voltage range: 2.7 V to 6.5 V
Output voltage: 0.6 V to V
Fixed frequency: 600 kHz or 1.2 MHz
Adjustable frequency: 500 kHz to 1.4 MHz
Synchronizable from 500 kHz to 1.4 MHz
Selectable synchronize phase shift: 0° or 180°
Current mode architecture
Precision enable input
Voltage tracking input
Integrated soft start
Starts up into a precharged output
UVLO, OVP, OCP, and thermal shutdown
Available in 16-lead, 4 mm × 4 mm LFCSP package
Communications and networking equipment
Industrial and instrumentation
TYPICAL APPLICATIONS CIRCUIT
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT CURRENT (A)
Figure 2. Efficiency vs. Output Current
The ADP2164 is a 4 A, synchronous, step-down dc-to-dc regulator
in a compact 4 mm × 4 mm LFCSP package. The regulator uses a
current mode, constant frequency pulse-width modulation (PWM)
control scheme for excellent stability and transient response.
The input voltage range of the ADP2164 is 2.7 V to 6.5 V. The
output voltage of the ADP2164 is adjustable from 0.6 V to the
input voltage (V
). The ADP2164 is also available in six preset
output voltage options: 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V.
The ADP2164 integrates a pair of low on-resistance P-channel
and N-channel internal MOSFETs to maximize efficiency and
minimize external component count. The 100% duty cycle
operation allows low dropout voltage at 4 A output current.
The high, 1.2 MHz PWM switching frequency allows the use of
small external components, and the SYNC input enables multiple
ICs to synchronize out of phase to reduce ripple and eliminate
Other key features of the ADP2164 include undervoltage lockout
(UVLO), integrated soft start to limit inrush current at startup,
overvoltage protection (OVP), overcurrent protection (OCP),
and thermal shutdown.