MIC23656
6A, Step-Down Converter
with HyperLight Load™ and I
2
C Interface
Features
•
•
•
•
Input Voltage Range: 2.4V to 5.5V
6A (pulsed) Output Current
Multiple Faults Indication through I
2
C
I
2
C Programmable:
- Output Voltage: 0.6V - 1.28V, 5 mV
Resolution or 0.6V - 3.84V, 10/20 mV
Resolution
- Slew Rate: 0.2 ms/V - 3.2 ms/V
- ON time (Switching Frequency)
- High Side Current Limit: 3.5A - 10A
- Enable Delay: 0.2 ms - 3 ms
- Output Discharge when Disabled
(EN = GND)
High Efficiency (up to 95%)
Ultra-Fast Transient Response
±1.5% Output Voltage Accuracy Over
Line/Load/Temperature Range
Safe Start-Up with Pre-Biased Output
Typical 1.5 µA Shutdown Supply Current
Low Dropout (100% Duty Cycle) Operation
I
2
C Speed up to 3.4 MHz
Latch-Off Thermal Shutdown Protection
Latch-Off Current Limit Protection
Power-Good (PG) Open-Drain Output
General Description
The MIC23656 is a high-efficiency, low-voltage input,
6A peak current synchronous step-down regulator. The
Constant-ON-Time (COT) control architecture with
HyperLight Load™ provides very high efficiency at light
loads, while still having ultra-fast transient response.
The I
2
C interface allows programming the output volt-
age between 0.6V and 1.28V, with 5 mV resolution or
between 0.6V and 3.84V, with 10 mV and 20 mV reso-
lution. Three different default voltage options (0.6V,
0.9V and 1.0V) are provided so that the application can
be started with a safe voltage level and then moved to
high performance modes under I
2
C control.
An open-drain Power Good output facilitates output
voltage monitoring and sequencing. If set in shutdown
(EN = GND), the MIC23656 typically draws 1.5 µA,
while the output is discharged through 10pull-down
(if the output discharge feature is enabled).
The MIC23656 pinout is compatible with the
MIC23650, so that applications can be easily
converted.
The 2.4V to 5.5V input voltage range, low shutdown
and quiescent currents make the MIC23656 ideal for
single-cell Li-Ion battery-powered applications. The
100% duty cycle capability provides low dropout
operation, extending operating range in portable
systems.
The MIC23656 is available in a thermally efficient,
16-Lead 2.5 mm x 2.5 mm x 0.55 mm thin FTQFN
package, with an operating junction temperature range
from -40°C to +125°C.
•
•
•
•
•
•
•
•
•
•
Applications
• Solid State Drives (SSD)
• FPGAs, DSP and Low-Voltage ASIC Power
2019 Microchip Technology Inc.
DS20006112B-page 1
MIC23656
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
SV
IN
, PV
IN
to A
GND
...................................................................................................................................... -0.3V to +6V
V
SW
to A
GND
................................................................................................................................................ -0.3V to +6V
V
EN
to A
GND
................................................................................................................................................ -0.3V to PV
IN
V
PG
to A
GND
................................................................................................................................................ -0.3V to PV
IN
V
SDA
, V
SCL
to A
GND
.................................................................................................................................... -0.3V to PV
IN
PV
IN
to SV
IN
.............................................................................................................................................. -0.3V to +0.3V
A
GND
to P
GND
............................................................................................................................................ -0.3V to +0.3V
Junction Temperature........................................................................................................................................... +150°C
Storage Temperature (T
S
) ...................................................................................................................... -65°C to +150°C
Lead Temperature (soldering, 10s) ...................................................................................................................... +260°C
ESD Rating (Note
1)
HBM ....................................................................................................................................................................... 2000V
CDM ....................................................................................................................................................................... 1500V
MM ........................................................................................................................................................................... 200V
† Notice:
Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at those or any other conditions above those indicated in the
operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods
may affect device reliability.
Note 1:
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5 k in series with
100 pF.
Operating Ratings
(1)
Supply Voltage (PV
IN
) .................................................................................................................................. 2.4V to 5.5V
Enable Voltage (V
EN
) ...................................................................................................................................... 0V to PV
IN
Power-Good (PG) Pull-Up Voltage (V
PU_PG
) .................................................................................................. 0V to 5.5V
Maximum Output Current ............................................................................................................................................. 6A
Junction Temperature (T
J
)...................................................................................................................... -40°C to +125°C
Note 1:
The device is not ensured to function outside the operating range.
DS20006112B-page 4
2019 Microchip Technology Inc.
MIC23656
ELECTRICAL CHARACTERISTICS (Note
1, 2)
Electrical Specifications:
unless otherwise specified, PV
IN
= 5V; V
OUT
= 1.0V, C
OUT
= 2 x 47 µF, T
A
= +25°C.
Boldface
values indicate -40°C
T
J
+125°C.
Parameter
V
IN
Supply
Input Range
Undervoltage Lockout
Threshold
Undervoltage Lockout
Hysteresis
Operating Supply Current
PV
IN
UVLO
UVLO_H
I
IN0
2.4
2.15
—
—
—
2.225
153
60
5.5
2.35
—
100
10
Shutdown Current
I
SHDN
—
1.5
V
V
V
µA
µA
SV
IN
rising
SV
IN
falling
V
OUT
=1.2V, non switching
V
EN
= 0V; PV
IN
= SV
IN
= 5.5V,
V
SW
= V
SDA
= V
SCL
= 0V
-40°C
T
J
+105°C
V
EN
= 0V; PV
IN
= SV
IN
= 5.5V,
V
SW
= V
SDA
= V
SCL
= 0V
-40°C
T
J
+125°C
V
OUT
from 0.6V to 1.28V (includes
line and load regulation)
V
OUT
from 0.6V to 1.28V
V
OUT
from 0.6V to 1.28V
V
OUT
from 1.28V to 3.84V
%
%
—
0.4
500
500
0.4
1.20
2.35
3.50
V
V
nA
nA
ms
ms
ms
ms
V
OUT
= 1.0V, V
IN
= 2.5 to 5.5V,
I
OUT
= 300 mA
V
OUT
= 1.0V, I
OUT
= 0A to 6A
V
EN
Rising, Regulator Enabled
V
EN
Falling, Regulator Shutdown
V
EN
= 0V
V
EN
= 5.5V
EN_DELAY<1:0> =
00;
Default
EN_DELAY<1:0> =
01
EN_DELAY<1:0> =
10
EN_DELAY<1:0> =
11
Symbol
Min.
Typ.
Max.
Units
Conditions
20
µA
Output Voltage
Output Accuracy
Output Voltage Step
(options YFT, HAYFT, FAYFT)
Output Voltage Step
(option SAYFT)
Line Regulation
Load Regulation
Enable Control
EN Logic Level High
EN Logic Level Low
EN Low Input Current
EN High Input Current
Enable Delay (2 Bits)
Enable Lockout Delay
0.15
0.85
1.70
2.55
Internal DAC Slew Rate (4 Bits)
Note 1:
2:
3:
Specification for packaged product only.
Characterized in open loop.
Tested in open loop. The closed-loop current limit is affected by inductance value, input voltage and temperature.
V
OUT_ACC
V
OUT_STEP
V
OUT_STEP
-1.5
5
10
20
0.06
0.2
1.5
%
mV
mV
V
EN_H
V
EN_L
I
EN_L
I
EN_H
1.2
—
—
—
0.01
0.01
0.25
1
2
3
2019 Microchip Technology Inc.
DS20006112B-page 5
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