ADP1822 Controller Datasheet
Step-Down DC-to-DC Controller
|Total Page||25 Pages|
PWM, Step-Down DC-to-DC Controller
with Margining and Tracking
Wide power input voltage range: 1 V to 24 V
Chip supply voltage range: 3.7 V to 5.5 V
Wide output voltage range: 0.6 V to 85% of input voltage
1% accuracy, 0.6 V reference voltage
Output voltage margining control
Output voltage tracking
All N-channel MOSFET
300 kHz, 600 kHz, or up to 1.2 MHz synchronized frequency
No current sense resistor required
Programmable soft start with reverse current protection
Thermal overload protection
1 µA shutdown supply current
Small, 24-lead QSOP package
Telecommunications and networking systems
High performance servers
Medical imaging systems
DSP core power supplies
Microprocessor core power supplies
Mobile communication base stations
The ADP1822 is a versatile and inexpensive synchronous voltage-
mode PWM step-down controller. It drives an all N-channel power
stage to regulate an output voltage as low as 0.6 V.
The ADP1822 regulated output can track another power supply
and can be dynamically adjusted up or down with the controller’s
margining-control inputs, making it ideal for high reliability
applications. It is well suited for a wide range of high power
applications, such as DSP power and processor core power in
telecommunications, medical imaging, high performance
servers, and industrial applications. It operates from a 3.7 V to
5.5 V supply with power input voltage ranging from 1.0 V to 24 V.
The ADP1822 can operate at any frequency between 300 kHz
and 1.2 MHz, either by synchronizing with an external source
or an internally generated, logic-controlled clock of 300 kHz or
600 kHz. It includes an adjustable soft start to allow sequencing
and quick power-up while preventing input inrush current. Output
reverse-current protection at startup prevents excessive output
voltage excursions. The adjustable, virtually lossless current-
limit scheme reduces external part count and improves efficiency.
The ADP1822 operates over the −40°C to +125°C junction
temperature range and is available in a 24-lead QSOP package.
92 1.8V OUTPUT
0 2 4 6 8 10 12 14
LOAD CURRENT (A)
Figure 1. Efficiency vs. Load Current, 5 V Input
VCC PVCC BST
SS AGND DGND MUP
Figure 2. Typical Operating Circuit
2.25V TO 24V
1000µF 1.8V, 15A
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ADP1822* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
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TOOLS AND SIMULATIONS
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• ADP1822 Material Declaration
• PCN-PDN Information
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|Features||Data Sheet PWM, Step-Down DC-to-DC Cont roller with Margining and Tracking ADP1 822 FEATURES Wide power input voltage range: 1 V to 24 V Chip supply voltage range: 3.7 V to 5.5 V Wide output volta ge range: 0.6 V to 85% of input voltage 1% accuracy, 0.6 V reference voltage O utput voltage margining control Output voltage tracking All N-channel MOSFET 3 00 kHz, 600 kHz, or up to 1.2 MHz synch ronized frequency No current sense resi stor required Power-good output Program mable soft start with reverse current p rotection Current-limit protection Ther mal overload protection Overvoltage pro tection Undervoltage lockout 1 µA shut down supply current Small, 24-lead QSOP package APPLICATIONS Telecommunication s and networking systems High performan ce servers Medical imaging systems DSP core power supplies Microprocessor core power supplies Mobile communication ba se stations Distributed power GENERAL D ESCRIPTION The ADP1822 is a versatile a nd inexpensive synchronous voltagemode PWM step-down controller.|
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