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MP2158A Folha de dados(PDF) 10 Page - Monolithic Power Systems

Nome de Peças MP2158A
Descrição Electrónicos  1A, 6V, 1.5MHz, 17uA IQ, COT Synchronous Step-Down Converter in Ultra-Small 2x1.5mm QFN-8
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Fabricante Electrônico  MPS [Monolithic Power Systems]
Página de início  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2158A Folha de dados(HTML) 10 Page - Monolithic Power Systems

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MP2158A – 1A, 6V, 1.5MHz SYNCHRONOUS STEP-DOWN CONVERTER
MP2158A Rev. 1.02
www.MonolithicPower.com
10
6/30/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
OPERATION
The MP2158A uses constant-on-time control
with input voltage feed-forward control to
stabilize the switching frequency over a full
input range. During light loads, the MP2158A
employs a proprietary control of low-side
switches and inductor currents to eliminate
ringing on the switching node and improve
efficiency.
Constant-On-Time Control
When compared to the fixed-frequency PWM
control, the constant-on-time control offers a
simpler control loop and faster transient response.
By
using
input
voltage
feed-forward,
the
MP2158A maintains a near constant switching
frequency across the input and output voltage
range. The on time of the switching pulse can be
estimated using Equation (1):
OUT
ON
IN
V
T0.667 s
V

(1)
To prevent inductor current runaway during the
load transient, the MP2158A sets the minimum off
time to 60ns. This minimum off time limit does not
affect the operation of the MP2158A in its steady
state in any way.
Light-Load Operation
In a light-load condition, the MP2158A uses a
proprietary control scheme to save power and
improve efficiency. The MP2158A uses a zero
current cross circuit to detect if the inductor
current is starting to reverse. The low-side
switch turns off when the inductor current starts
to
reverse
and
triggers
discontinuous
conduction mode (DCM) operation.
The delay for the internal circuit propagation
time is typically 50ns. This means that the
inductor current continues falling after the ZCD
is triggered in this delay. If the inductor current
falling slew rate is too fast (VOUT is high or close
to VIN), the low-side MOSFET turns off, the
inductor current may be negative, and the
MP2158A will not be able to enter DCM
operation. If DCM is required, the off time of the
low-side MOSFET in CCM should be longer
than 100ns (2 times the propagation delay). For
example, if VIN is 3.6V and Vo is 3.3V, the off
time in CCM is 55ns. It is difficult to enter DCM
at a light load. Using a smaller inductor can
help the MP2158A enter DCM more easily.
Enable
When the input voltage is greater than the
under-voltage
lockout
(UVLO)
threshold
(typically 2.3V), the MP2158A is enabled by
pulling EN higher than 1.2V. Leaving EN
floating or grounded disables the MP2158A.
There is an internal 1MΩ resistor from EN to
ground.
Soft Start
The MP2158A has a built-in soft start that
ramps up the output voltage in a controlled slew
rate, avoiding overshoot at start-up. The soft-
start time is typically about 1.15ms.
Power Good Indicator
The MP2158A uses an open-drain with a
550kΩ pull-up resistor as a power good
indicator (PG). When FB is within +/-10% of the
regulation voltage (i.e. 0.6V), PG is pulled up to
VIN by the internal resistor. If the FB voltage is
out of the +/-10% window, PG is pulled to
ground by an internal MOSFET. The MOSFET
has a maximum Rdson of less than 400Ω.
Current Limit
The MP2158A has a 2A minimum current limit
for the high-side switch. When the high-side
switch hits its current limit, the MP2158A enters
the hiccup threshold until the current drops.
This prevents the inductor current from rising
and possibly damaging the components.
Short Circuit and Recovery
The MP2158A enters short-circuit protection
mode when the current limit is hit and tries to
recover from the short circuit by entering hiccup
mode. In short-circuit protection, the MP2158A
disables the output power stage, discharges a
soft-start capacitor, and automatically tries to
soft start again. If the short-circuit condition still
holds after the soft start ends, the MP2158A
repeats this operation until the short circuit
disappears and the output rises back to
regulation level.


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