MCP1623/24
Low-Voltage Input Boost Regulator
for PIC
®
Microcontrollers
Features:
• Up to 96% Typical Efficiency
• 425 mA Typical Peak Input Current Limit:
- I
OUT
> 50 mA @ 1.2V V
IN
, 3.3V V
OUT
- I
OUT
> 175 mA @ 2.4V V
IN
, 3.3V V
OUT
- I
OUT
> 175 mA @ 3.3V V
IN,
5.0V V
OUT
• Low Start-up Voltage: 0.65V, typical 3.3V V
OUT
@ 1 mA
• Low Operating Input Voltage: 0.35V, typical
3.3V
OUT
@ 1 mA
• Adjustable Output Voltage Range: 2.0V to 5.5V
• Maximum Input Voltage
V
OUT
< 5.5V
• 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
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
MCP1623/24
6-Lead SOT-23
SW 1
GND 2
EN 3
6 V
IN
5 V
OUT
4 V
FB
Applications:
• One, Two and Three Cell Alkaline and NiMH/NiCd
Low-Power PIC
®
Microcontroller Applications
2010 Microchip Technology Inc.
DS41420B-page 1
MCP1623/24
L
1
4.7 µH
V
OUT
3.3V
976 K
V
FB
562 K
GND
V
SS
V
DD
V
IN
0.9V To 1.7V
+
ALKALINE
SW V
OUT
V
IN
C
IN
4.7 µF
EN
C
OUT
10 µF
PIC
®
MCU
-
MCP1623/24 Typical Application Circuit
100
90
80
V
IN
= 2.5V
V
IN
= 1.2V
V
IN
= 0.8V
Efficiency (%)
70
60
50
40
30
20
0.01
0.1
1
10
100
1000
I
OUT
(mA)
MCP1624 Efficiency vs. I
OUT
, V
OUT
= 3.3V
FIGURE 1:
Typical Application.
DS41420B-page 2
2010 Microchip Technology Inc.
MCP1623/24
1.0
ELECTRICAL
CHARACTERISTICS
†
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.
Absolute Maximum Ratings †
EN, FB, V
IN,
V
SW
, V
OUT
- GND ........................... +6.5V
EN, FB ...........<greater of V
OUT
or V
IN
> (GND - 0.3V)
Output Short Circuit Current....................... Continuous
Power Dissipation ............................ Internally Limited
Storage Temperature .........................-65
o
C to +150
o
C
Ambient Temp. with Power Applied......-40
o
C to +85
o
C
Operating Junction Temperature........-40
o
C to +125
o
C
ESD Protection On All Pins:
HBM........................................................ 3 kV
MM........................................................ 300 V
DC CHARACTERISTICS
Electrical Characteristics:
Unless otherwise indicated, V
IN
= 1.2V, C
OUT
= C
IN
= 10 µF, L = 4.7 µH, V
OUT
= 3.3V,
I
OUT
= 15 mA, T
A
= +25°C.
Boldface
specifications apply over the T
A
range of -40
o
C to +85
o
C.
Parameters
Input Characteristics
Minimum Start-Up Voltage
Minimum Input Voltage After
Start-Up
Output Voltage Adjust Range
Maximum Output Current
Feedback Voltage
Feedback Input Bias Current
Quiescent Current – PFM
mode
Quiescent Current – PWM
mode
Quiescent Current – Shutdown
V
IN
V
IN
V
OUT
I
OUT
V
FB
I
VFB
I
QPFM
—
—
2.0
50
1.120
—
—
—
1.21
10
19
0.65
0.35
0.8
—
5.5
—
1.299
—
30
V
V
V
mA
V
pA
µA
Note 1
Note 1
V
OUT
V
IN
;
Note 2
1.5V V
IN
, 3.3V V
OUT
—
—
Measured at V
OUT
= 4.0V;
EN = V
IN
, I
OUT
= 0 mA;
Note 3
Measured at V
OUT
; EN = V
IN
I
OUT
= 0 mA;
Note 3
V
OUT
= EN = GND;
Includes N-Channel and
P-Channel Switch Leakage
V
IN
= V
SW
= 5V; V
OUT
=
5.5V V
EN
= V
FB
= GND
V
IN
= VS
W
= GND;
V
OUT
= 5.5V
V
IN
= 3.3V, I
SW
= 100 mA
V
IN
= 3.3V, I
SW
= 100 mA
Sym.
Min.
Typ.
Max.
Units
Conditions
I
QPWM
I
QSHDN
—
—
220
0.7
—
2.3
µA
µA
NMOS Switch Leakage
PMOS Switch Leakage
NMOS Switch ON Resistance
PMOS Switch ON Resistance
Note 1:
2:
3:
4:
5:
I
NLK
I
PLK
R
DS(ON)N
R
DS(ON)P
—
—
—
—
0.3
0.05
0.6
0.9
1
0.2
—
—
µA
µA
3.3 K resistive load, 3.3V
OUT
(1 mA).
For V
IN
> V
OUT
, V
OUT
will not remain in regulation.
I
Q
is measured from V
OUT
; V
IN
quiescent current will vary with boost ratio. V
IN
quiescent current can be
estimated by: (I
QPFM
* (V
OUT
/V
IN
)), (I
QPWM
* (V
OUT
/V
IN
)).
220 resistive load, 3.3V
OUT
(15 mA).
Peak current limit determined by characterization, not production tested.
2010 Microchip Technology Inc.
DS41420B-page 3
MCP1623/24
DC CHARACTERISTICS (CONTINUED)
Electrical Characteristics:
Unless otherwise indicated, V
IN
= 1.2V, C
OUT
= C
IN
= 10 µF, L = 4.7 µH, V
OUT
= 3.3V,
I
OUT
= 15 mA, T
A
= +25°C.
Boldface
specifications apply over the T
A
range of -40
o
C to +85
o
C.
Parameters
NMOS Peak Switch Current
Limit
V
OUT
Accuracy
Line Regulation
Sym.
I
N(MAX)
V
OUT
%
Min.
300
-7.4
Typ.
425
—
Max.
—
+7.4
Units
mA
%
Note 5
Includes Line and Load
Regulation; V
IN
= 1.5V
I
OUT
= 50 mA
V
IN
= 1.5V to 3V
I
OUT
= 25 mA
I
OUT
= 25 mA to 50 mA;
V
IN
= 1.5V
Conditions
V
OUT
/V
OUT
) /
V
IN
|
V
OUT
/
V
OUT
|
DC
MAX
f
SW
V
IH
V
IL
I
ENLK
t
SS
T
SD
T
SDHYS
—
0.01
—
%/V
Load Regulation
Maximum Duty Cycle
Switching Frequency
EN Input Logic High
EN Input Logic Low
EN Input Leakage Current
Soft-start Time
Thermal Shutdown Die
Temperature
Die Temperature Hysteresis
Note 1:
2:
3:
4:
5:
—
—
370
90
—
—
—
—
—
0.01
90
500
—
—
0.005
750
150
10
—
—
630
—
20
—
—
—
—
%
%
kHz
%of V
IN
I
OUT
= 1 mA
%of V
IN
I
OUT
= 1 mA
µA
µS
C
C
V
EN
= 5V
EN Low-to-High, 90% of
V
OUT
;
Note 4
3.3 K resistive load, 3.3V
OUT
(1 mA).
For V
IN
> V
OUT
, V
OUT
will not remain in regulation.
I
Q
is measured from V
OUT
; V
IN
quiescent current will vary with boost ratio. V
IN
quiescent current can be
estimated by: (I
QPFM
* (V
OUT
/V
IN
)), (I
QPWM
* (V
OUT
/V
IN
)).
220 resistive load, 3.3V
OUT
(15 mA).
Peak current limit determined by characterization, not production tested.
TEMPERATURE SPECIFICATIONS
Electrical Specifications:
Parameters
Temperature Ranges
Operating Junction Temperature
Range
Storage Temperature Range
Maximum Junction Temperature
Package Thermal Resistance
Thermal Resistance, 5L-TSOT23
JA
—
192
—
°C/W
EIA/JESD51-3 Standard
T
J
T
A
T
J
-40
-65
—
—
—
—
+125
+150
+150
°C
°C
°C
Transient
Steady State
Sym.
Min.
Typ.
Max.
Units
Conditions
DS41420B-page 4
2010 Microchip Technology Inc.
MCP1623/24
2.0
Note:
TYPICAL PERFORMANCE CURVES
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
IN
= EN = 1.2V, C
OUT
= C
IN
= 10 µF, L = 4.7 µH, V
OUT
= 3.3V, I
LOAD
= 15 mA, T
A
= +25°C.
27.5
25.0
V
IN
= 1.2V
V
OUT
= 5.0V
22.5
20.0
17.5
15.0
12.5
10.0
-40
-25
-10
5
20
35
50
65
80
V
OUT
= 2.0V
V
OUT
= 3.3V
100
90
80
70
60
50
40
30
20
10
0
0.01
0.1
1
V
IN
= 1.6V
I
Q
PFM Mode (µA)
Efficiency (%)
V
IN
= 0.8V
V
IN
= 1.2V
10
100
1000
Ambient Temperature (°C)
I
OUT
(mA)
FIGURE 2-1:
V
OUT
I
Q
vs. Ambient
Temperature in PFM Mode.
300
275
250
225
200
175
150
-40
-25
-10
5
20
35
50
65
80
V
OUT
= 3.3V
V
IN
= 1.2V
V
OUT
= 5.0V
FIGURE 2-4:
MCP1624 Efficiency vs.
I
OUT
, V
OUT
= 2.0V.
100
90
80
70
60
50
40
30
20
10
0
0.01
0.1
1
V
IN
= 2.5V
I
Q
PWM Mode (µA)
Efficiency (%)
V
IN
= 0.8V
V
IN
= 1.2V
10
100
1000
Ambient Temperature (°C)
I
OUT
(mA)
FIGURE 2-2:
V
OUT
I
Q
vs. Ambient
Temperature in PWM Mode.
350
FIGURE 2-5:
MCP1624 Efficiency vs.
I
OUT
, V
OUT
= 3.3V.
100
V
IN
= 3.6V
90
80
70
60
50
40
30
20
10
0
0.01
V
IN
= 1.8V
V
IN
= 1.2V
Output Current (mA)
300
250
200
150
100
50
0
0.5
1
1.5
V
OUT
= 2.0V
V
OUT
= 3.3V
V
OUT
= 5.0V
Efficiency (%)
2
2.5
3
3.5
4
4.5
5
0.1
1
10
100
1000
Input Voltage (V)
I
OUT
(mA)
FIGURE 2-3:
V
OUT
.
MCP1623/24 I
OUTMAX
vs.
FIGURE 2-6:
MCP1624 Efficiency vs.
I
OUT
, V
OUT
= 5.0V.
2010 Microchip Technology Inc.
DS41420B-page 5
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