TPS54162-Q1_15 Datasheet, PDF (1/42 Pages) Texas Instruments – 1-A 60-V STEP-DOWN DC/DC CONVERTER WITH LOW QUIESCENT CURRENT

TPS54162-Q1
www.ti.com
SLVSA32C – OCTOBER 2009 – REVISED MAY 2010
1-A 60-V STEP-DOWN DC/DC CONVERTER WITH LOW QUIESCENT CURRENT
Check for Samples: TPS54162-Q1
FEATURES
1
• Asynchronous Switch Mode Regulator
• 3.6 V to 48 V Operating Range, Withstands
Transients up to 60 V
• 1 A Maximum Load Current
• 50 µA Typical Quiescent Current
• 200 kHz to 2.2 MHz Switching Frequency
• 0.8 V ± 1.5% Voltage Reference
• High Voltage Tolerant Enable Input
• Soft Start on Enable Cycle
• Slew Rate Control on Internal Power Switch
• Low-Power Mode for Light Load Conditions
• Programmable Delay for Power-On Reset
• External Compensation for Error Amplifier
• Reset Function Filter Time for Fast Negative
Transients
• Programmable Overvoltage, Undervoltage
Output Monitor
• Thermal Sensing and Shutdown
• Switch Current Limit Protection
• Short Circuit and Overcurrent Protection of
FET
• Junction Temperature Range: –40°C to 150°C
• 20-Pin HTSSOP PowerPAD™ Package
APPLICATIONS
• Qualified for Automotive Applications
• Automotive Telematics
• Navigation Systems
• In-Dash Instrumentation
• Battery Powered Applications
DESCRIPTION
The TPS54162 is a step-down switch-mode power supply with a voltage supervisor and an integrated NMOS
switching FET. Integrated input voltage line feed forward topology improves line transient regulation of the
voltage mode buck regulator. The regulator has a cycle-by-cycle current limit. The device also features
low-power mode operation under light load conditons which reduces the supply current to 50 µA (typical). By
pulling the EN pin low, the supply shutdown current is reduced to 1 µA (typical).
An open drain reset signal indicates when the nominal output drops below the reset threshold set by an external
resistor divider network. The output voltage start up ramp is controlled by a soft start capacitor. There is an
internal undervoltage shut down which is activated when the input supply ramps down to 2.6 V. The device is
protected during an overload condition on output by frequency fold back operation, and also has a thermal
shutdown protection.
TYPICAL APPLICATION
TYPICAL CONVERTER EFFICIENCY
VBATT
D1
C1
VIN ^{TPS54162 VReg}
R11
VIN
EN
R10
LPM
SYNC
R7
Rslew
C6
SS
RST
BOOT
PH
VSENSE
R8
RT/CLK
C2
Cdly
COMP
RST_TH
GND
OV_TH
R12
RESET
C3
L
D2
C7
R4
R9
VReg
C4
C8
C5
R6
R5
R1
R2
R3
90
80
VIN = 14 V
70
60 VIN = 7 V
50
40
30
20
10
0
0.05
V_Reg = 5 V
f_sw = 500 kHz
L = 22 µH
C = 100 µF
Rslew = 30 kW
T_A = 25°C
0.25
0.5
0.75
1
ILoad - Load Current - A
Figure 1.
Figure 2.
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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.
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