Datasheet
ERROR
AMPLIFIER
Boot
Charge
Boot
UVLO
UVLO
Current
Sense
Oscillator
with PLL
Frequency
Shift
Logic
And
PWM Latch
Slope
Compensation
PWM
Comparator
Minimum
Clamp
Pulse
Skip
Maximum
Clamp
Voltage
Reference
Overload
Recovery
VSENSE
SS/TR
COMP
RT/CLK
PH
BOOT
VIN
Thermal
Shutdown
EN
Enable
Comparator
Shutdown
Logic
Shutdown
Enable
Threshold
TPS54160A Block Diagram
Logic
Shutdown
PWRGD
Shutdown
OV
GND
POWERPAD
7
4
8
5
9
11
10
1
2
3
6
UV
TPS54160
,
TPS54160A
www.ti.com
SLVSB56C –MAY 2012–REVISED FEBRUARY 2014
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Fixed Frequency PWM Control
The TPS54160A uses an adjustable fixed frequency, peak current mode control. The output voltage is compared
through external resistors on the VSENSE pin to an internal voltage reference by an error amplifier which drives
the COMP pin. An internal oscillator initiates the turn on of the high-side power switch. The error amplifier output
is compared to the high-side power switch current. When the power switch current reaches the level set by the
COMP voltage, the power switch is turned off. The COMP pin voltage will increase and decrease as the output
current increases and decreases. The device implements a current limit by clamping the COMP pin voltage to a
maximum level. The Eco-mode™ is implemented with a minimum clamp on the COMP pin.
8.3.2 Slope Compensation Output Current
The TPS54160A adds a compensating ramp to the switch current signal. This slope compensation prevents sub-
harmonic oscillations. The available peak inductor current remains constant over the full duty cycle range.
8.3.3 Pulse Skip Eco-mode
The TPS54160A enters the pulse skip mode when the voltage on the COMP pin is the minimum clamp value.
The TPS54160A operates in a pulse skip mode at light load currents to improve efficiency. The peak switch
current during the pulse skip mode will be the greater value of 50mA or the peak inductor current that is a
function of the minimum on time, input voltage, output voltage and inductance value. When the load current is
low and the output voltage is within regulation the device will enter a sleep mode and draw only 116 μA input
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