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
2018 Microchip Technology Inc.
DS20006112A-page 1
MIC23656
Typical Application
C1
1 μF
V
IN
2.4V to 5.5V
C2
22 μF
S
VIN
SW
P
VIN
V
OUT
C3
47 μF
L
0.47
μH
V
OUT
C4
47 μF
MIC23656
EN
SDA
SCL
P
GND
A
GND
ENABLE
I
2
C
PG
P
GOOD
Package Types
MIC23656 Top View
16-pin FTQFN
2.5 mm x 2.5 mm
P
GND
P
GND
EP
17
5
PV
IN
6
SV
IN
7
SCL
8
SDA
P
GND
12 A
GND
11 V
OUT
10 PG
9 EN
SW 1
P
GND
2
P
GND
3
P
VIN
4
* Includes Exposed Thermal Pad (EP); see
Table 3-1.
Ordering Information
Default Status at Power-Up
Part Number
Output
High Side
Voltage Current Limit
(typical)
0.6 V
1.0 V
3.5 A
10 A
TON<1:0> -
ns
[00] - 260 ns
[10] - 130 ns
Soft-Start
Speed
200 µs/V
800 µs/V
Overtemp
Latch-Off
Immediate
Latch-Off
Latch-Off
after 4 OT
cycles
Latch-Off
after 4 OT
cycles
Latch-Off
after 4 OT
cycles
Output
Pull-Down
when Disabled
NO
YES
Output Voltage
Range/Step
0.600V-1.280V/
5 mV
0.600V-1.280V/
5 mV
0.600V-1.280V/
5 mV
0.600V-1.280V/
10 mV
1.280V-3.840V/
20 mV
MIC23656YFT
MIC23656-HAYFT
MIC23656-FAYFT
0.9 V
10 A
[10] - 130 ns
SW
16 15 14 13
800 µs/V
YES
MIC23656-SAYFT
1.0 V
10 A
[10] - 130 ns
800 µs/V
YES
DS20006112A-page 2
2018 Microchip Technology Inc.
MIC23656
Functional Block Diagram
MIC23656
SVIN
T
ON
ADJUST
MINIMUM
T
OFF
HSD
Control
Logic
1.0μF
10
PVIN
V
IN
2.4V to 5.5V
22μF
UVLO
EN
EN
2.225V/
2.072V
OT
SW
165°C/143°C
L1
0.47μH
V
OUT
0.6V-1.28V
PD
/6A peak
ZC
2x
47μF
PVIN
RIPPLE
INJECTION
LSD
PGND
COMP
EA
VOUT
SDA
SDA
SCL
V
IN
SCL
I
2
C
CONTROL
AND
REGISTERS
8-Bit
DAC
V
REF
PD
100k
AGND
PG
PG
DELAY
V
REF
-9%
2018 Microchip Technology Inc.
DS20006112A-page 3
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
VSEL1
, V
VSEL2
to A
GND
............................................................................................................................. -0.3V to PV
IN
PV
IN
to SV
IN
.............................................................................................................................................. -0.3V to +0.3V
S
GND
to P
GND
............................................................................................................................................ -0.3V to +0.3V
) ...................................................................................................................... -65°C to +150°C
Lead Temperature (soldering, 10s) ...................................................................................................................... +260°C
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 (V
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
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.
DS20006112A-page 4
2018 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
Shutdown Current
Output Voltage
Output Accuracy
Output Voltage Step
(options YFT, HAYFT, FAYFT)
Output Voltage Step
(option SAYFT)
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)
Slew Rate Time (Time to 1V)
T
RISE
100
250
400
600
750
950
1100
1300
1450
1650
1800
1800
2180
2350
2520
2690
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.
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