TPS65300-Q1 Datasheet, PDF (1/36 Pages) Texas Instruments – 3-MHz Step-Down Regulator and Triple Linear Regulators

TPS65300-Q1
www.ti.com
SLVSBB6B – MARCH 2012 – REVISED APRIL 2012
3-MHz Step-Down Regulator and Triple Linear Regulators
Check for Samples: TPS65300-Q1
FEATURES
1
• Input VIN Range 5.6 V to 40 V, With Transients
up to 45 V
• All Outputs Support Ceramic Output
Capacitors for Stability
• Switch-Mode Regulator With Integrated High-
Side Switch
– Recommended Switch-Mode Frequency
Range 2 MHz to 3 MHz
– Overcurrent Protection and 1.2-A Peak
Switch Current
• One Linear Regulators and Two Linear
Regulator Controllers With 0.8-V ±1.5%
Reference
• Status Indicator Output of IGN_EN Input
• Soft Start on Ignition (IGN_EN)/Enable Input
(EN) Cycle
• External Clock Input for Synchronization
• Programmable Power-On-Reset Delay, Reset-
Function Filter Timer for Fast Negative
Transients
• Voltage Supervisor for the Following Supplies
– VREG, 3.3 V, 1.2 V
• Thermal Shutdown Protection for Excessive
Power Dissipation
• Operating Junction Temperature Range: –40°C
to 150°C
• Thermally Enhanced 24-Pin HTSSOP or 24-Pin
QFN Package
APPLICATIONS
• Power Supply for TMS570 Microcontrollers
• Power Supply for C28XXX DSP
• General-Purpose Power Supply for Automotive
Applications
– Microcontroller and DSP
DESCRIPTION
The TPS65300-Q1 power supply is a combination of
a single switch-mode buck power supply and three
linear regulators. This is a monolithic high-voltage
switching regulator with an integrated 1.2-A peak
current switch, 45-V power MOSFET, and one low-
voltage linear regulator and two voltage-regulator
controllers.
The device has a voltage supervisor which monitors
the output of the switch-mode power supply, the 3.3-
V linear regulator, and the 1.2-V linear regulator. An
external timing capacitor is used to set the power-on
delay and the release of the reset output nRST. This
reset output is also used to indicate if the switch-
mode supply, the 3.3-V linear regulator supply, or the
1.2-V linear regulator supply is outside the set limits.
The 5-V regulator tracks the 3.3-V linear regulator
within the specified limits.
The TPS65300-Q1 has a switching frequency range
from 2 MHz to 3 MHz, allowing the use of low-profile
inductors and low-value input and output ceramic
capacitors. External loop compensation gives the
user the flexibility to optimize the converter response
for the appropriate operating conditions.
This device has built-in protection features such as
soft start on IGN_EN ON or enables cycle, pulse-by-
pulse current limit, thermal sensing, and shutdown
due to excessive power dissipation.
Space
VI = 5.6V to 40V
Supply
VIN_D
2
S1
VIN ₄
CI
10uF
EN
9
IGN_EN
5
RT/CLK ₈
R1
SS
20
C1
BOOT _LDO
6
1uF
GND
12
DELAY
21
C2
PGND
24
BOOT
3
0.1uf _L
1 ^PH
10uf
S2
22
VREG _R12
14
COMP
C3
15 _VSENSE
10uF
CO
5.3W
5.3V
TPS65300 -Q1
19 ^3.3VDRIVE
3. 3VSENSE
18
5V
10
2. 2uF
2.2uF
T1
660
3.3V
5V
23 ^nRST
1.2VDRIVE
17
16 ^1.2VSENSE
3k
2.2uF
T2
240
1.2V
Figure 1. Typical Application Schematic
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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 © 2012, Texas Instruments Incorporated