TPS40322 Datasheet, PDF (1/40 Pages) Texas Instruments – Dual Output or Two-Phase Synchronous Buck Controller

TPS40322
www.ti.com
SLUSAF8 – JUNE 2011
Dual Output or Two-Phase Synchronous Buck Controller
FEATURES
1
• Dual- or Multi-phase Synchronous Buck
Controller
• 180° Out-of-Phase Reduces Input Ripple
• Input Voltage Range from 3 V to 20 V
• Output Voltage Range: 0.6 V to 5.6 V
• Adjustable Frequency 100 kHz to 1 MHz
• Bidirectional SYNC with 0°/180° or 90°/270°
Phase Shift
• Voltage Mode Control With Input Feed-forward
• Accurate Current Sharing for Multi-phase
Operation
• Individual PowerGood Outputs
• Individual Enable and Programmable Soft
Start, With Pre-bias Start-up
• ±0.5%, 600-mV Reference
• Output UV/OV Protection and Input
Undervoltage Lockout
• Individual Overcurrent Limit Setting
• Hiccup Overcurrent Protection
• Accurate Inductor DCR or Resistive Current
Sensing
• Remote Sense for Multi-phase Applications
• Internal N-Channel FET Drivers
• Integrated Bootstrap Switches
• Available in 5 mm × 5 mm 32-Pin QFN Package
APPLICATIONS
• Multiple Rail Systems
• Telecom Base Station
• Switcher/Router Networking
• xDSL Broadband Access
• Server and Storage System
DESCRIPTION
The TPS40322 is a dual-output, synchronous buck
controller. It can also be configured as a
single-output, two-phase controller. The 180°
out-of-phase operation reduces the input current
ripple and extends the input capacitor lifetime.
Bi-directional master/slave synchronization function
provides evenly distributed phase shift for a
four-output system that reduces input ripple further
and attenuates the system noise.
The wide input range can support 3.3-V, 5-V, and
12-V buses. The accurate reference voltage satisfies
the precision voltage need of the modern ASICs and
potentially reduces the output capacitance
requirement. Separate PGOOD signals provide
flexibility for system monitoring and sequencing. The
two channels are independently controlled and each
soft-start time is programmable. Voltage mode control
is implemented to reduce noise sensitivity and also
ensures low duty ratio conversion.
.
SIMPLIFIED APPLICATION CIRCUIT
26
VDD
31 UVLO
BP6 20
VIN
3V
to
20 V
VOUT1
24 HDRV1
25 BOOT1
23 SW1
HDRV2 16
BOOT2 15
SW2 17
22 LDRV1
21 PGND1
30 ILIM1
LDRV2 18
PGND2 19
ILIM2 11
28 CS1+
CS2+ 13
TPS40322
29 CS1–
CS2– 12
27 PG1
PG2 14
4 FB1
FB2 8
9 DIFFO
COMP2 7
5 COMP1
SYNC 1
2 RT
PHSET 32
EN/SS1 AGND EN/SS2
3
6
10
VOUT2
UDG-10215
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011, Texas Instruments Incorporated