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.