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MP1605 Datasheet(PDF) 13 Page - Monolithic Power Systems

Part # MP1605
Description  2A, Synchronous, Step-Down Converter with Low 11uA Quiescent Current
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP1605 Datasheet(HTML) 13 Page - Monolithic Power Systems

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MP1605
– 2A, SYNCHRONOUS, STEP-DOWN SWITCHER WITH 11µA IQ
MP1605 Rev. 1.0
www.MonolithicPower.com
13
6/17/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
HS_ driver
VREF
VFB
COT
Generator
EN
IAAM
IL_ sense
R
S
Q
FBCOMP
AAMCOMP
Figure 5: Simplified AAM Control Logic
AAM
Io
IL
b. Increase load in AAM
AAM
Io
IL
a. Light load in AAM
Figure 6: AAM Comparator Control TON
If the AAM comparator pulse is shorter than the
on-time generator, the operation mode is as
shown in Figure 7. This usually occurs when
using a very small inductance.
AAM
Io
IL
b. Increase load in on-timer
AAM
Io
IL
a. Light load in on-timer
Figure 7: On-Timer Control TON
The AAM circuit has another 150ns of AAM
blank time in sleep mode. If the on-timer is less
than 150ns, the high-side MOSFET may turn off
after the on-time generator pulse without AAM
control. The on-time pulse at sleep mode is
about 40% larger than in DCM or CCM. In this
condition, IL may not reach the AAM threshold
(see Figure 8).
AAM
Io
IL
150ns
150ns
Figure 8: AAM Blank Time in Sleep Mode
The AAM threshold decreases as TON increases
(see Figure 9). For CCM state, IOUT requires
more than half of the AAM threshold.
Figure 9: AAM Threshold Decreases as TON
Increases
The MP1605 uses a zero-current cross detect
circuit (ZCD) to determine when the inductor
current begins reversing. When the inductor
current reaches the ZCD threshold, the low-side
switch is turned off.
AAM mode with the ZCD circuit makes the
MP1605 work continuously in DCM at light load,
even if VOUT is close to VIN.
Enable (EN)
When the input voltage is greater than the
under-voltage
lockout
(UVLO)
threshold
(typically 2V), the MP1605 can be enabled by
pulling EN higher than 1.2V. Leaving EN
floating or pulling it down to ground disables the
MP1605. There is an internal 1M
Ω resistor from
EN to ground.
When the MP1605 is disabled, the part goes
into output discharge mode automatically. The
internal discharge MOSFET provides a resistive
discharge path for the output capacitor.
Soft Start (SS)
The MP1605 uses a built-in soft start (SS) that
ramps up the output voltage at a controlled slew
rate to avoid overshooting at start-up. The soft-
start time is about 0.5ms, typically.


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