20 V, 4 A Synchronous Step-Down
Regulator with Low-Side Driver
Data Sheet
ADP2380
FEATURES
TYPICAL APPLICATIONS CIRCUIT
V
Input voltage: 4.5 V to 20 V
IN
1
2
3
4
5
6
7
8
16
15
14
13
12
PVIN
PVIN
BST
Integrated 44 mΩ high-side MOSFET
0.6 V 1% reference voltage over temperature
Continuous output current: 4 A
Programmable switching frequency: 250 kHz to 1.4 MHz
Synchronizes to external clock: 250 kHz to 1.4 MHz
180° out-of-phase synchronization
Programmable UVLO
L
C
V
BST
OUT
C
IN
SW
SW
C
OUT
UVLO ADP2380
PGOOD
FET
LD
C
RT
VREG
PGND
GND
VREG
R
OSC
11
10
9
SYNC
EN/SS
COMP
R
R
TOP
C
SS
Power-good output
FB
External compensation
BOT
C
C_EA
R
Internal soft start with external adjustable option
Startup into a precharged output
Supported by ADIsimPower design tool
C_EA
C
CP_EA
Figure 1.
APPLICATIONS
Communications infrastructure
Networking and servers
Industrial and instrumentation
Healthcare and medical
Intermediate power rail conversion
DC-to-dc point of load application
100
95
90
85
80
75
70
65
60
55
50
V
V
V
= 1.2V
= 3.3V
= 5V
OUT
OUT
OUT
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, VIN = 12 V, fSW = 250 kHz
GENERAL DESCRIPTION
The ADP2380 is a current mode control, synchronous, step-down,
dc-to-dc regulator. It integrates a 44 mΩ high-side power MOSFET
and a low-side driver to provide a high efficiency solution. The
ADP2380 runs from an input voltage of 4.5 V to 20 V and can
deliver 4 A of output current. The output voltage can be adjusted
to 0.6 V to 90% of the input voltage. The switching frequency of
the ADP2380 can be programmed from 250 kHz to 1.4 MHz or
fixed at 290 kHz or 540 kHz. The synchronization function allows
the switching frequency to be synchronized to an external clock
to minimize system noise.
External compensation and an adjustable soft start provide
design flexibility. The power-good output provides simple and
reliable power sequencing. Additional features include
programmable undervoltage lockout (UVLO), overvoltage
protection (OVP), overcurrent protection (OCP), and thermal
shutdown (TSD).
The ADP2380 operates over the −40°C to +125°C junction
temperature range and is available in a 16-lead TSSOP_EP
package.
Rev. 0
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