Datasheet ADP2118 (Analog Devices)

3 A, 1.2 MHz/600 kHz, High Efficiency, Synchronous, Step-Down DC-to-DC Regulator Data Sheet ADP2118 FEATURES GENERAL DESCRIPTION 3 A continuous output current
The ADP2118 is a low quiescent current, synchronous, step-down
75 mΩ and 40 mΩ integrated FET
dc-to-dc regulator in a compact 4mm × 4mm LFCSP package. It
±1.5% output accuracy
uses a current mode, constant frequency pulse-width modulation
Input voltage range from 2.3 V to 5.5 V
(PWM) control scheme for excellent stability and transient
Output voltage from 0.6 V to VIN
response. Under light loads, the ADP2118 can be configured to
600 kHz or 1.2 MHz fixed switching frequency
operate in pulse frequency modulation (PFM) mode that
Synchronizable between 600 kHz and 1.4 MHz
reduces switching frequency to save power.
Selectable synchronize phase shift: 0o or 180o
The ADP2118 runs from input voltages of 2.3 V to 5.5 V. The
Selectable PWM or PFM mode operation
output voltage of the ADP2118ACPZ-R7 is adjustable from
Current mode architecture
0.6 V to input voltage (V
Precision enable input
IN), and the ADP2118ACPZ-x.x-R7 are available in preset output voltage options of 1.2 V and 3.3 V.
Power good output
The ADP2118 requires minimal external parts and provides a high
Voltage tracking input
efficiency solution with its integrated power switch, synchronous
Integrated soft start
rectifier, and internal compensation. The IC draws less than 3 µA
Internal compensation
from the input source when it is disabled. Other key features
Starts up into a precharged output
include undervoltage lockout (UVLO), integrated soft start to
UVLO, OVP, OCP, and thermal shutdown
limit inrush current at startup, overvoltage protection (OVP),
Available in 16-lead, 4 mm × 4 mm LFCSP package
overcurrent protection (OCP), and thermal shutdown (TSD).
Supported by ADIsimPower design tool APPLICATIONS Point of load conversion Communications and networking equipments Industrial and instrumentation Consumer electronics Medical appliances C1 0.1µF R1 10Ω VIN R2 5V 100 10kΩ CIN 100µF 16 15 14 13 X5R, 90 PFM OPERATION N N 6.3V EN VI 80 PVI GOOD P 70 L 1 SYNC/MODE PVIN 12 1µH %) V ( 60 OUT 2 FREQ SW 11 Y ADP2118 C 3.3V C OUT 3A N 50 3 TRK SW 10 100µF IE X5R, FPWM OPERATION 40 4 FB SW 9 6.3V FFIC E ND ND ND 30 ND G G G G P P P 20 5 6 7 8 VIN = 5V 10 VOUT = 3.3V f R R S = 1.2MHz BOT TOP 2.21kΩ 10kΩ 0
001
0.01 0.1 1 10
050
OUTPUT CURRENT (A)
08301- 08301- Figure 1. Typical Applications Circuit Figure 2. Efficiency vs. Output Current
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Document Outline Features Applications General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance Boundary Conditions ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Functional Block Diagram Theory of Operation Control Scheme PWM Mode Operation PFM Mode Operation Slope Compensation Enable/Shutdown Integrated Soft Start Tracking Oscillator and Synchronization Current Limit and Short-Circuit Protection Overvoltage Protection (OVP) Undervoltage Lockout (UVLO) Thermal Shutdown Power Good Applications Information ADIsimPower™ Design Tool Output Voltage Selection Inductor Selection Output Capacitor Selection Input Capacitor Selection Voltage Tracking Typical Application Circuits Outline Dimensions Ordering Guide