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MP2159A датащи(PDF) 11 Page - Monolithic Power Systems

номер детали MP2159A
подробное описание детали  1 A, 6 V, 1.5 MHz, Low IQ, COT Synchronous Step-Down Converter in 8-pin TSOT23
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производитель  MPS [Monolithic Power Systems]
домашняя страница  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2159A датащи(HTML) 11 Page - Monolithic Power Systems

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MP2159A – 1 A, 6 V, 1.5 MHz SYNCHRONOUS STEP-DOWN CONVERTER
MP2159A Rev. 1.02
www.MonolithicPower.com
11
6/30/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
OPERATION
The MP2159A uses constant-on-time (COT)
control with input voltage feed forward to
stabilize the switching frequency over a full
input range. At light load, the MP2159A
employs a proprietary control of the low-side
switch and the inductor current to eliminate
ringing on the switching node and improve
efficiency.
Constant-On-Time (COT) Control
Compare to fixed frequency PWM control,
constant-on-time control offers the advantage of a
simpler control loop and faster transient response.
By using input voltage feed forward, MP2159A
maintains a nearly 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 load
transient, the MP2159A fixes the minimum off
time at 60 ns. However, this minimum-off time
limit will not affect operation of the MP2159A in
steady-state operation.
Light-Load Operation
In a light-load condition, the MP2159A uses a
proprietary control scheme to save power and
improve efficiency. It turns off the low-side
switch when the inductor current begins to
reverse. Then it works in discontinuous
conduction mode (DCM) operation.
There is a zero current cross circuit to detect if
the
inductor
current
starts
to
reverse.
Considering the internal circuit propagation time,
the typical delay is 50 ns. This means the
inductor current will still fall after the ZCD is
triggered in this delay. If the inductor current
falling slew rate is fast (Vo voltage is high or
close to Vin), the low-side MOSFET (LS-FET) is
turned off, and the inductor current may be
negative.
This
phenomena
prevents
the
MP2159A from entering DCM operation even if
there is no load. If DCM is required, the off time
of the LS-FET in CCM should be longer than
100 ns (2 times the propagation delay). For
example, if Vin is 3.6 V and Vo is 3.3 V, the off
time in CCM is 55 ns. It is difficult to enter DCM
at light load. Using a smaller inductor improves
this problem, making it easier to enter DCM.
Enable (EN)
When the input voltage is greater than the
under-voltage
lockout
threshold
(2.3
V,
typically), the MP2159A is enabled by pulling
EN higher than 1.2 V. Floating EN or pulling EN
down to ground disables the MP2159A. There
is an internal 1 MΩ resistor from EN to ground.
Soft Start (SS)
MP2159A has built-in soft start that ramps up
the output voltage in a controlled slew rate,
avoiding overshoot at start-up. The soft-start
time period is about 1.15 ms, typically.
Power GOOD Indicator (PG)
MP2159A has an open drain with a 550 kΩ pull-
up resistor pin that functions as a power good
indicator (PG). When FB is within +/-10% of the
regulation voltage (i.e., 0.6 V), PG is pulled up
to VIN by the 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 Rdson of less than 400
Ω.
Current Limit
MP2159A has a minimum 2 A current limit for
the high-side switch. When the high-side switch
hits the current limit, the MP2159A remains at
the hiccup threshold until the current decreases.
This prevents the inductor current from
continuing to build up, which will result in
damage to the components.
Short Circuit and Recovery
The MP2159A enters short-circuit protection
mode when the current limit is reached, and it
tries to recover from the short circuit with hiccup
mode. During a short-circuit protection, the
MP2159A disables the output power stage,
discharges the soft-start capacitor, and then
automatically tries to soft-start again. If the
short-circuit condition still holds after the soft-
start ends, the MP2159A repeats this operation
cycle until the short circuit disappears, and the
output rises back to regulation level.


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