1.1 Features 1

• Three Step-Down Converters:

– Up to 1.2 A of Output Current for VDD1

• TPS65921B Supports VDD1 up to 1.2 A

• TPS65921B1 Supports VDD1 up to 1.4 A

(Necessary for 1-GHz Operation)

– SmartReflex™ Dynamic Voltage Management

– 3.2-MHz Fixed Frequency Operation

– VIN Range from 2.7 to 4.5 V

– Typical 30 μA Quiescent per Converter

• Four General-Purpose Configurable LDOs:

– Dynamic Voltage Scaling

– 220-mA Maximum Current for One LDO

– VIN Range from 2.7 to 4.5 V

– 2 LDOs With Low Noise and High PSRR

• RTC With Alarm Wake-Up Mechanism

• Clock Management

– 32-kHz Crystal Oscillator

– Clock Slicer for 26, 19.2, and 38.4 MHz

– HF Clock Output Buffer

• USB:

– USB HS 2.0 Transceiver

– USB 1.3 OTG-Compliant

– 12-Bit ULPI 1.1 Interface

– USB Power Supply (5-V CP for VBUS)

• Control

– High-Speed I2C Interface

– All Resource Configurable by I2C

• Keypad Interface up to 8 × 8

• 10-Bit A/D Converter

• Hot-Die, Thermal Shutdown Protection

• μ*BGA 120 Balls ZQZ

1.2 Applications

• Mobile Phones and Smart Phones

• MP3 Players

• Handheld Devices

• E-Books

• OMAP™ and Low-Power DSP Supply

1.3 Description

The TPS65921 device is a highly integrated power-management circuit (IC) that supports the power and

peripheral requirements of the OMAP application processors. The device contains power management, a

universal serial bus (USB) high-speed (HS) transceiver, an analog-to-digital converter (ADC), a real-time

clock (RTC), a keypad interface, and an embedded power control (EPC). The power portion of the device

contains three buck converters, two controllable by a dedicated SmartReflex class-3 interface, multiple

low-dropout (LDO) regulators, an EPC to manage the power-sequencing requirements of OMAP, and an

RTC module. The USB module provides an HS 2.0 transceiver suitable for direct connection to the OMAP

universal transceiver macrocell interface (UTMI) + low pin interface (ULPI) with an integrated charge pump

(CP).

The device also provides auxiliary modules: ADC, keypad interface, and general-purpose inputs/outputs

(GPIOs) muxed with the JTAG functions. The keypad interface implements a built-in scanning algorithm to

decode hardware-based key presses and to reduce software use, with multiple additional GPIOs that can

be used as interrupts when they are configured as inputs.