TPS55065-Q1 Datasheet, PDF (1/30 Pages) Texas Instruments – BUCK/BOOST SWITCH-MODE REGULATOR

TPS55065-Q1
www.ti.com ............................................................................................................................................................................................... SLIS132 – OCTOBER 2008
BUCK/BOOST SWITCH-MODE REGULATOR
FEATURES
1
•23 Qualified for Automotive Applications
• Switch-Mode Regulator
– 5 V ±2%, Normal Mode
– 5 V ±3%, Low-Power or Crossover Mode
• Switching Frequency, 440 kHz (typical)
• Input Operating Range, 1.5 V to 40 V, (V_driver)
– 500-mA Load-Current Capability
– 200-mA Load-Current Capability Down to
2-V Input (V_driver)
– 120-mA Load-Current Capability Down to
1.5-V Input (V_driver)
• Enable Function
• Low-Power Operation Mode
• Switched 5-V Regulated Output on 5Vg With
Current Limit
• Programmable Slew Rate and Frequency
Modulation for EMI Consideration
• Reset Function With Deglitch Timer and
Programmable Delay
• Alarm Function for Undervoltage Detection
and Indication
• Thermally Enhanced Package for Efficient
Heat Management
APPLICATIONS
• Automotive Electronic Controller Power
Supply
SCR1
Cboot2
Cboot1
V_driver
L1
PGND
L2
V_OUT
5_Vg
A_IN
PWP HTSSOP PACKAGE
(TOP VIEW)
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
SCR0
5Vg_ENABLE
ENABLE
V_logic
GND
R_mod
REST
A_OUT
RESET
CLP
P0021-02
DESCRIPTION
The TPS55065 is a switch-mode regulator with integrated switches for voltage-mode control. With the aid of
external components (LC combination), the device regulates the output to 5 V ±3% for a wide input-voltage
range.
The TPS55065 offers a reset function to detect and indicate when the 5-V output rail is outside of the specified
tolerance. This reset delay is programmable using an external timing capacitor on the REST terminal.
Additionally, an alarm (A_OUT) feature is activated when the input supply rail V_driver is below a prescaled specified
value (set by the A_IN terminal).
The TPS55065 has a frequency-modulation scheme to minimize EMI. The clock modulator permits a modulation
of the switching frequency to reduce interference energy in the frequency band.
The 5Vg output is a switched 5-V regulated output with internal current limiting to prevent RESET from being
asserted when powering a capacitive load on the supply line. This function is controlled by the 5Vg_ENABLE
terminal. If there is a short to ground on this output (5Vg output), the output self-protects by operating in a
chopping mode. This does, however, increase the output ripple voltage on V_OUT during this fault condition.
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.
PowerPAD is a trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
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 © 2008, Texas Instruments Incorporated