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MP2122 データシート(PDF) 12 Page - Monolithic Power Systems

部品番号 MP2122
部品情報  6V, 2A, Low Quiescent Current Dual, SYNC Buck Regulator
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メーカー  MPS [Monolithic Power Systems]
ホームページ  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2122 データシート(HTML) 12 Page - Monolithic Power Systems

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MP2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR
MP2122 Rev. 1.02
www.MonolithicPower.com
12
6/12/2017
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
OPERATION
MP2122 is a fully-integrated, dual-channel,
synchronous,
step-down
converter.
Both
channels have peak-current modes with internal
compensation for faster transient responses
and cycle-by-cycle current limits.
MP2122 is optimized for low-voltage, portable
applications where efficiency and small size are
critical.
180° Phase-Shift
By default, the MP2122’s two channels operate
at a 180° phase-shift to reduce input current
ripple: The smaller current ripple allows for a
smaller input bypass capacitor. In CCM, two
internal clocks control the switching: The high-
side MOSFET turns on at the corresponding
CLK’s rising edge.
CLK1
CLK2
SW1
SW2
t
CLk1, 2 has a 180o phase shift
Figure 2: Clock/Switching Timing
However, the switching frequency for each
channel falls when operating at low dropout, so
the MP2122 operates at a default switching
frequency of 1MHz with a fixed OFF time. After
the input voltage recovers, switching for PWM
mode resumes normally and synchronizes with
the master oscillator for phase-shifted operation.
Light-Load Operation
In light loads, the MP2122 uses a proprietary
control scheme to save power and improve
efficiency. The MP2122 will turn off the low side
switch when inductor current starts to reverse.
Then
MP2122
works
in
discontinuous
conduction mode (DCM) operation.
When either channel enters DCM or low-
dropout operation, this channel will not be
controlled by the internal 1MHz oscillator.
Condition
Mode
CH1
CH2
CH1
CH2
1
Heavy Load
1MHz
CCM
1MHz
CCM,0°
Phase
2
Light Load
DCM
DCM
3
Low Dropout
Fixed OFF
Time
Fixed OFF
Time
4
Heavy
Load
Light
Load
0.95MHz
CCM
DCM
5
Light
Load
Heavy
Load
DCM
0.95MHz
CCM
6
Heavy
Load
Low
Dropout
0.95MHz
CCM
Fixed OFF
Time
7
Low
Dropout
Heavy
Load
Fixed OFF
Time
0.95MHz
CCM
8
Light
Load
Low
Dropout
DCM
Fixed OFF
Time
9
Low
Dropout
Light
Load
Fixed OFF
Time
DCM
Soft Start
MP2122 has a built-in soft start that ramps up the
output voltage at a controlled slew rate to start-up
overshoot. The soft-start time is ~0.5ms.
Current Limit and Short-Circuit Recovery
Each channel’s high-side switch has a 3.5A
(typ.) current limit. The MP2122 treats any
current-limit condition that remains for 400us as
a short and enter hiccup mode.
The MP2122 disables its output power stage in
hiccup mode, and then slowly discharges the
soft-start capacitor before initiating soft-start. If
the short-circuit condition remains, the MP2122
repeats this operation till the short circuit
disappears and output returns to the regulation
level.


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