Datasheet ADP2119, ADP2120 (Analog Devices)

2 A/1.25 A, 1.2 MHz, Synchronous, Step-Down DC-to-DC Regulators Data Sheet ADP2119 /ADP2120 FEATURES TYPICAL APPLICATION CIRCUIT Continuous output current C1 0.1µF ADP2119: 2 A ADP2120: 1.25 A VIN 5V 145 mΩ and 70 mΩ integrated MOSFETs CIN R1 22µF 10Ω ADP2119/ADP2120 Input voltage range from 2.3 V to 5.5 V X5R 6.3V 1 VIN EN 10 Output voltage from 0.6 V to V IN ±1.5% output accuracy 2 PVIN SYNC/MODE 9 R2 1.2 MHz fixed switching frequency V 10kΩ OUT 3 SW PGOOD 8 Synchronizable between 1 MHz and 2 MHz 3.3V COUT L 22µF 1.5µH Selectable PWM or PFM mode operation 4 X5R PGND TRK 7 RTOP Current mode architecture 6.3V 10kΩ 5 GND FB 6 Precision threshold enable input RBOT 2.21kΩ Power-good flag
001
Voltage tracking
08716-
Integrated soft start
Figure 1.
Internal compensation Startup with precharged output UVLO, OVP, OCP, and thermal shutdown 10-lead, 3 mm × 3 mm LFCSP_WD package Supported by ADIsimPower™ design tool APPLICATIONS Point of load conversion Communications and networking equipment Industrial and instrumentation Consumer electronics Medical applications GENERAL DESCRIPTION
The ADP2119/ADP2120 are low quiescent current, synchronous, (OCP), and thermal shutdown (TSD). step-down dc-to-dc regulators in a compact 3 mm × 3 mm
100
LFCSP_WD package. Both devices use a current mode, constant
VIN = 5V 90 VOUT = 1.8V
frequency pulse-width modulation (PWM) control scheme for
80
excellent stability and transient response. Under light load conditions, they can be configured to operate in a pulse frequency modulation
70 PFM
(PFM) mode, which reduces switching frequency to save power.
%) ( 60
The ADP2119/ADP2120 support input voltages from 2.3 V to
NCY 50 E ICI
5.5 V. The output voltage can be adjusted from 0.6 V up to the
F 40 F E
input voltage (V
FPWM
IN) for the adjustable version, whereas the fixed
30
output version is available in preset output voltage options of 3.3 V,
20
2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V. The ADP2119/ADP2120 require
10
minimal external parts and provide a high efficiency solution with their integrated power switches, synchronous rectifiers, and internal
0 0.01 0.1 1
002 compensation. Each IC draws less than 2 µA current from the input
OUTPUT CURRENT (A)
08716- source when it is disabled. Other key features include undervoltage Figure 2. ADP2119 Efficiency vs. Output Current lockout (UVLO), integrated soft start to limit inrush current at startup, overvoltage protection (OVP), overcurrent protection
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Document Outline Features Applications Typical Application Circuit General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance Boundary Condition 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 (PGOOD) 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