Microchip MCP1623, MCP1624 Schematic [ru]
MCP1623/24
4
1
2
3
6
V
IN
V
FB
SW
GND
EN
5
V
OUT
MCP1623/24
6-Lead SOT-23
Low-Voltage Input Boost Regulator
for PIC® Microcontrollers
Features
• Up to 96% Typical Efficiency
• 425 mA Typical Peak Input Current Limit:
-I
> 50 mA @ 1.2V VIN, 3.3V V
OUT
-I
> 175 mA @ 2.4V VIN, 3.3V V
OUT
-I
> 175 mA @ 3.3V V
OUT
IN,
• Low Start-up Voltage: 0.65V, typical 3.3V V
@ 1 mA
• Low Operating Input Voltage: 0.35V, typical
OUT
@ 1 mA
3.3V
• Adjustable Output Voltage Range: 2.0V to 5.5V
• Maximum Input Voltage V
OUT
• Automatic PFM/PWM Operation (MCP1624)
• PWM-only Operation (MCP1623)
• 500 kHz PWM Frequency
• Low Device Quiescent Current: 19 µA, typical
PFM mode
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft-Start
• True Load Disconnect
• Shutdown Current (All States): < 1 µA
• Low Noise, Anti-Ringing Control
• Overtemperature Protection
• SOT-23-6 Package
5.0V V
< 5.5V
OUT
OUT
OUT
OUT
General Description
The MCP1623/24 is a compact, high-efficiency, fixed
frequency, synchronous step-up DC-DC converter. It
provides an easy-to-use power supply solution for PIC
microcontroller applications powered by either one-cell,
two-cell, or three-cell alkaline, NiCd, NiMH, one-cell
Li-Ion or Li-Polymer batteries.
Low-voltage technology allows the regulator to start up
without high inrush current or output voltage overshoot
from a low 0.65V input. High efficiency is accomplished by
integrating the low resistance N-Channel Boost switch
and synchronous P-Channel switch. All compensation
and protection circuitry are integrated to minimize external
components. For standby applications, the MCP1624
operates and consumes only 19 µA while operating at no
load. The MCP1623 device option is available that
operates in PWM-only mode.
A “true” load disconnect mode provides input to output
isolation while disabled (EN = GND) by removing the
normal boost regulator diode path from input to output.
This mode consumes less than 1 µA of input current.
Output voltage is set by a small external resistor
divider.
Packaging
Applications
• One, Two and Three Cell Alkaline and NiMH/NiCd
Low-Power PIC
2010 Microchip Technology Inc. DS41420A-page 1
®
Microcontroller Applications
MCP1623/24
V
IN
GND
V
FB
SW
VIN
0.9V To 1.7V
V
OUT
3.3V
C
OUT
10 µF
C
IN
4.7 µF
L
1
4.7 µH
V
OUT
+
-
976 K
562 K
ALKALINE
EN
PIC® MCU
VDD
VSS
MCP1623/24 Typical Application Circuit
MCP1624 Efficiency vs. I
OUT
, V
OUT
= 3.3V
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
I
OUT
(mA)
VIN= 0.8V
VIN= 1.2V
VIN= 2.5V
Efficiency (%)
FIGURE 1: Typical Application.
DS41420A-page 2 2010 Microchip Technology Inc.
MCP1623/24
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
EN, FB, V
EN, FB ...........<greater of V
Output Short Circuit Current....................... Continuous
IN, VSW
, V
- GND ...........................+6.5V
OUT
or VIN > (GND - 0.3V)
OUT
† 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.
Power Dissipation ............................ Internally Limited
Storage Temperature .........................-65
Ambient Temp. with Power Applied......-40
Operating Junction Temperature........-40
o
C to +150oC
o
C to +85oC
o
C to +125oC
ESD Protection On All Pins:
HBM........................................................ 3 kV
MM........................................................ 300 V
DC CHARACTERISTICS
Electrical Characteristics: Unless otherwise indicated, VIN = 1.2V, C
= +25°C.
T
A
Boldface specifications apply over the T
range of -40oC to +85oC.
A
Parameters Sym Min Typ Max Units Conditions
Input Characteristics
Minimum Start-Up Voltage V
Minimum Input Voltage After
IN
V
IN
—0.65 0.8 V Note 1
—0.35 — VNote 1
Start-Up
Output Voltage Adjust Range V
Maximum Output Current I
Feedback Voltage V
Feedback Input Bias Current I
Quiescent Current – PFM
I
OUT
OUT
FB
VFB
QPFM
2.0 5.5 VV
50 ——mA1.5V V
1.120 1.21 1.299 V—
—10 —pA—
— 19 30 µA Measured at V
mode
Quiescent Current – PWM
I
QPWM
— 220 — µA Measured at V
mode
Quiescent Current – Shutdown I
QSHDN
NMOS Switch Leakage I
PMOS Switch Leakage I
NMOS Switch ON Resistance R
PMOS Switch ON Resistance R
DS(ON)N
DS(ON)P
Note 1: 3.3 K resistive load, 3.3V
2: For V
3: IQ is measured from V
> V
IN
OUT
estimated by: (I
, V
will not remain in regulation.
OUT
OUT
* (V
QPFM
4: 220 resistive load, 3.3V
NLK
PLK
OUT
; VIN quiescent current will vary with boost ratio. VIN quiescent current can be
OUT/VIN
OUT
—0.7 2.3µAV
—0.3 1 µAV
— 0.05 0.2 µA VIN=VSW= GND;
—0.6 — VIN = 3.3V, ISW = 100 mA
—0.9 — VIN = 3.3V, ISW = 100 mA
(1 mA).
)), (I
QPWM
* (V
(15 mA).
5: Peak current limit determined by characterization, not production tested.
= CIN = 10 µF, L = 4.7 µH, V
OUT
OUT/VIN
)).
OUT
VIN; Note 2
OUT
EN = V
=3.3V, I
, 3.3V V
IN
, I
IN
OUT
=15mA,
OUT
OUT
= 4.0V;
OUT
= 0 mA;
Note 3
; EN = VIN
= 0 mA; Note 3
I
OUT
= EN = GND;
OUT
OUT
Includes N-Channel and
P-Channel Switch Leakage
IN=VSW
5.5V V
V
OUT
=5V; V
EN=VFB
=5.5V
OUT
=GND
=
2010 Microchip Technology Inc. DS41420A-page 3
MCP1623/24
DC CHARACTERISTICS (CONTINUED)
Electrical Characteristics: Unless otherwise indicated, VIN = 1.2V, C
= +25°C.
T
A
Boldface specifications apply over the T
range of -40oC to +85oC.
A
Parameters Sym Min Typ Max Units Conditions
NMOS Peak Switch Current
I
N(MAX)
300 425 — mA Note 5
Limit
V
% -7.4 — +7.4 % Includes Line and Load
V
Accuracy
OUT
Line Regulation V
Load Regulation V
Maximum Duty Cycle DC
Switching Frequency f
EN Input Logic High V
EN Input Logic Low V
EN Input Leakage Current I
Soft-start Time t
Thermal Shutdown Die
OUT
OUT
V
V
OUT
SW
ENLK
T
OUT
) /
IN
OUT
MAX
IH
IL
SS
SD
/V
—0.01
|
—0.01 — %I
/
|
—90 —%
370 500 630 kHz
90
——
—
—
—
0.005 — µA VEN = 5V
750
150
Temperature
(1 mA).
)), (I
(15 mA).
—
QPWM
* (V
Die Temperature Hysteresis T
Note 1: 3.3 K resistive load, 3.3V
2: For VIN > V
3: I
is measured from V
Q
estimated by: (I
OUT
, V
will not remain in regulation.
OUT
OUT
* (V
QPFM
4: 220 resistive load, 3.3V
SDHYS
OUT
; VIN quiescent current will vary with boost ratio. VIN quiescent current can be
OUT/VIN
OUT
5: Peak current limit determined by characterization, not production tested.
= CIN = 10 µF, L = 4.7 µH, V
OUT
——
10
OUT/VIN
)).
—
%/V V
%of V
20 %of V
—
—
—
µS EN Low-to-High, 90% of
C
C
OUT
Regulation; V
I
OUT
= 1.5V to 3V
IN
I
OUT
OUT
= 1.5V
V
IN
I
OUT
IN
I
OUT
IN
V
OUT
=3.3V, I
OUT
IN
=15mA,
= 1.5V
= 50 mA
= 25 mA
= 25 mA to 50 mA;
= 1 mA
= 1 mA
; Note 4
TEMPERATURE SPECIFICATIONS
Electrical Specifications:
Parameters Sym Min Typ Max Units Conditions
Temperature Ranges
Operating Junction Temperature
Range
Storage Temperature Range T
Maximum Junction Temperature T
Package Thermal Resistance
Thermal Resistance, 5L-TSOT23
DS41420A-page 4 2010 Microchip Technology Inc.
T
J
A
J
JA
-40 — +125 °C Steady State
-65 — +150 °C
— — +150 °C Transient
— 192 — °C/W EIA/JESD51-3 Standard
MCP1623/24
10.0
12.5
15.0
17.5
20.0
22.5
25.0
27.5
-40 -25 -10 5 20 35 50 65 80
Ambient Temperature (°C)
I
Q
PFM Mode (µA)
V
OUT
= 2.0V
V
OUT
= 5.0V
V
OUT
= 3.3V
VIN = 1.2V
150
175
200
225
250
275
300
-40 -25 -10 5 20 35 50 65 80
Ambient Temperature (°C)
I
Q
PWM Mode (µA)
V
OUT
= 3.3V
V
OUT
= 5.0V
VIN = 1.2V
0
50
100
150
200
250
300
350
0.511.522.533.544.55
Input Voltage (V)
V
OUT
= 3.3V
V
OUT
= 2.0V
V
OUT
= 5.0V
Output Current (mA)
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
I
OUT
(mA)
VIN= 0.8V
VIN= 1.2V
VIN= 1.6V
Efficiency (%)
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
I
OUT
(mA)
VIN= 0.8V
VIN= 1.2V
VIN= 2.5V
Efficiency (%)
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
I
OUT
(mA)
VIN= 3.6V
VIN= 1.2V
VIN= 1.8V
Efficiency (%)
2.0 TYPICAL PERFORMANCE CURVES
Note: The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein are
not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note: Unless otherwise indicated, V
FIGURE 2-1: V
OUT IQ
vs. Ambient
Temperature in PFM Mode.
= EN = 1.2V, C
IN
OUT=CIN
=10µF, L =4.7µH, V
OUT
=3.3V, I
=15mA, TA=+25°C.
LOAD
FIGURE 2-4: MCP1624 Efficiency vs.
I
, V
OUT
= 2.0V.
OUT
FIGURE 2-2: V
Temperature in PWM Mode.
FIGURE 2-3: MCP1623/24 I
V
OUT
.
2010 Microchip Technology Inc. DS41420A-page 5
OUT IQ
vs. Ambient
OUTMAX
vs.
FIGURE 2-5: MCP1624 Efficiency vs.
I
, V
OUT
= 3.3V.
OUT
FIGURE 2-6: MCP1624 Efficiency vs.
, V
I
OUT
OUT
= 5.0V.
MCP1623/24
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
I
OUT
(mA)
VIN= 1.6V
VIN= 0.8V
VIN= 1.2V
Efficiency (%)
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
I
OUT
(mA)
VIN= 2.5V
VIN= 0.8V
VIN= 1.2V
Efficiency (%)
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
I
OUT
(mA)
VIN= 3.6V
VIN= 1.2V
VIN= 1.8V
Efficiency (%)
0.25
0.40
0.55
0.70
0.85
1.00
0 20406080100
I
OUT
(mA)
V
IN
(V)
Startup
Shutdown
V
OUT
= 3.3V
480
485
490
495
500
505
510
515
520
525
-40 -25 -10 5 20 35 50 65 80
Ambient Temperature (°C)
Switching Frequency (kHz)
V
OUT
= 3.3V
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
012345678910
I
OUT
(mA)
V
IN
(V)
V
OUT
= 3.3V
V
OUT
= 5.0V
V
OUT
= 2.0V
Note: Unless otherwise indicated, V
= EN = 1.2V, C
IN
FIGURE 2-7: MCP1623 Efficiency vs.
I
, V
OUT
= 2.0V.
OUT
OUT=CIN
=10µF, L =4.7µH, V
OUT
=3.3V, I
=15mA, TA= +25°C.
LOAD
FIGURE 2-10: Minimum Start-up and
Shutdown V
into Resistive Load vs. I
IN
OUT
.
FIGURE 2-8: MCP1623 Efficiency vs.
, V
I
OUT
OUT
= 3.3V.
FIGURE 2-9: MCP1623 Efficiency vs.
I
, V
OUT
= 5.0V.
OUT
DS41420A-page 6 2010 Microchip Technology Inc.
FIGURE 2-11: F
vs. Ambient
OSC
Temperature.
FIGURE 2-12: MCP1623 PWM Pulse
Skipping Mode Threshold vs. I
OUT
.
MCP1623/24
10
100
1000
10000
0.8 1.1 1.4 1.7 2 2.3 2.6 2.9 3.2 3.5
VIN (V)
I
IN
(µA)
V
OUT
= 3.3V V
OUT
= 5.0V
V
OUT
= 2.0V
V
OUT
= 2.0V
V
OUT
= 3.3V
V
OUT
= 5.0V
PWM / PFM
PWM ONLY
0
1
2
3
4
5
1 1.5 2 2.5 3 3.5 4 4.5 5
> VIN or V
Switch Resistance (Ohms)
P - Channel
N - Cha nnel
0
2
4
6
8
10
12
14
16
00.511.522.533.54
VIN (V)
I
OUT
(mA)
V
OUT
= 2.0V
V
OUT
= 3.3V
V
OUT
= 5.0V
Note: Unless otherwise indicated, V
= EN = 1.2V, C
IN
FIGURE 2-13: Input No Load Current vs.
V
.
IN
OUT=CIN
=10µF, L =4.7µH, V
OUT
=3.3V, I
=15mA, TA=+25°C.
LOAD
FIGURE 2-16: MCP1624 3.3V V
Mode Waveforms.
OUT
PFM
FIGURE 2-14: N-Channel and P-Channel
R
vs. > of VIN or V
DSON
OUT
FIGURE 2-15: PFM/PWM Threshold
IN
.
Current vs. V
2010 Microchip Technology Inc. DS41420A-page 7
OUT
FIGURE 2-17: MCP1623 3.3V V
.
PWM Mode Waveforms.
OUT
FIGURE 2-18: MCP1623/24 High Load
Waveforms.
MCP1623/24
MCP1623 PWM
Note: Unless otherwise indicated, V
= EN = 1.2V, C
IN
FIGURE 2-19: 3.3V Start-up After Enable.
OUT=CIN
=10µF, L =4.7µH, V
OUT
=3.3V, I
=15mA, TA= +25°C.
LOAD
FIGURE 2-22: MCP1623 3.3V V
Transient Waveforms.
OUT
Load
FIGURE 2-20: 3.3V Start-up when V
V
ENABLE
FIGURE 2-21: MCP1624 3.3V V
.
OUT
Transient Waveforms.
=
IN
Load
FIGURE 2-23: MCP1623 2.0V V
Transient Waveforms.
FIGURE 2-24: 3.3V V
Line Transient
OUT
Waveforms.
OUT
Load
DS41420A-page 8 2010 Microchip Technology Inc.
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Tab le 3- 1.
TABLE 3-1: PIN FUNCTION TABLE
Pin No. MCP1623/24 SOT23 Description
SW 1 Switch Node, Boost Inductor Input Pin
GND 2 Ground Pin
EN 3 Enable Control Input Pin
FB 4 Feedback Voltage Pin
V
OUT
V
IN
3.1 Switch Node Pin (SW)
Connect the inductor from the input voltage to the SW
pin. The SW pin carries inductor current and can be as
high as 425 mA peak. The integrated N-Channel switch
drain and integrated P-Channel switch source are internally connected at the SW node.
5 Output Voltage Pin
6 Input Voltage Pin
MCP1623/24
3.2 Ground Pin (GND)
The ground or return pin is used for circuit ground
connection. Length of trace from input cap return, output
cap return and GND pin should be made as short as
possible to minimize noise on the GND pin.
3.3 Enable Pin (EN)
The EN pin is a logic-level input used to enable or
disable device switching and lower quiescent current
while disabled. A logic high (>90% of VIN) will enable
the regulator output. A logic low (<20% of V
ensure that the regulator is disabled.
IN
) will
3.4 Feedback Voltage Pin (FB)
The FB pin is used to provide output voltage regulation
by using a resistor divider. The FB voltage will be 1.21V
typical with the output voltage in regulation.
3.5 Output Voltage Pin (V
The output voltage pin connects the integrated
P-Channel MOSFET to the output capacitor. The FB
voltage divider is also connected to the V
voltage regulation.
OUT
)
OUT
pin for
3.6 Power Supply Input Voltage Pin
(V
)
IN
Connect the input voltage source to VIN. The input
source should be decoupled to GND with a 4.7 µF
minimum capacitor.
2010 Microchip Technology Inc. DS41420A-page 9
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