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MP2162A 데이터시트(PDF) 11 Page - Monolithic Power Systems

부품명 MP2162A
상세설명  2A, 6V, 1.5MHz, 17uA IQ, COT Synchronous Step-Down Converter
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제조업체  MPS [Monolithic Power Systems]
홈페이지  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2162A 데이터시트(HTML) 11 Page - Monolithic Power Systems

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MP2162A – 2A, 6V, 1.5MHz SYNCHRONOUS STEP-DOWN CONVERTER
MP2162A Rev. 1.03
www.MonolihicPower.com
11
6/30/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
OPERATION
The MP2162A uses constant-on-time control with
an input voltage feed-forward to stabilize the
switching frequency over a full input voltage
range. During light loads, the MP2162A employs
proprietary control of the low-side switches and
inductor currents to eliminate ringing on the
switching node and improve efficiency.
Constant-On-Time Control
Compared to the fixed frequency PWM control,
the constant-on-time control offers the advantage
of a simpler control loop and a faster transient
response. By using input voltage feed-forward,
the MP2162A maintains a near constant
switching frequency across the input and output
voltage ranges. The on time of the switching
pulse can be estimated with Equation (1):
OUT
ON
IN
V
T0.667 s
V

(1)
To prevent inductor current runaway during the
load transient, the MP2162A has a fixed
minimum off time of 60ns. However, this
minimum off time limit does not affect the
operation of the MP2162A in its steady state in
any way.
Light-Load Operation
In light-load conditions, the MP2162A uses a
proprietary control scheme to save power and
improve efficiency. The MP2162A 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 then begins working in discontinuous
conduction mode (DCM).
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 fast (VOUT is high or close to
VIN), then the low-side MOSFET turns off, the
inductor current may be negative, and the
MP2162A will not be able to enter DCM
operation. If DCM mode is required, the off time
of the low-side MOSFET in CCM should be
longer than 100ns (2x 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
MP2162A enter DCM more easily.
Enable (EN)
When the input voltage is greater than the under-
voltage lockout (UVLO) threshold (typically 2.3V),
the MP2162A is enabled by pulling EN higher
than 1.2V. Leaving EN floating or grounded
disables the MP2162A. There is an internal 1MΩ
resistor from EN to ground.
Soft Start
The MP2162A has a built-in soft start that ramps
up the output voltage at a controlled slew rate to
avoid overshooting at start-up. The soft-start time
is typically about 1.15ms.
Power Good Indicator
The MP2162A uses an open drain with a 550kΩ
pull-up resistor as a power good indicator (PG).
When the FB voltage is within +/-10% of the
regulation voltage (i.e. 0.6V), PG is pulled up to
VIN by an internal resistor. If the FB voltage is
out of the +/-10% window, PG is pulled down to
ground by an internal MOSFET. The MOSFET
has a maximum Rds(on) of less than 400Ω.
Current Limit
The MP2162A has a typical 3.2A current limit for
the high-side switch. When the high-side switch
hits its current limit, the MP2162A enters hiccup
mode until the current drops. This prevents the
inductor
current
from
rising
and
possibly
damaging the components.
Short Circuit and Recovery
The MP2162A enters short-circuit protection
mode when the current limit is hit; it tries to
recover from the short circuit by entering hiccup
mode. In short-circuit protection, the MP2162A
disables the output power stage, discharges a
soft-start capacitor, and automatically tries to soft
start. If the short-circuit condition still holds after
the soft start ends, the MP2162A repeats this
operation until the short circuit disappears, and
the output rises back to regulation levels.


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