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MCP1252
Technical data
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MICROCHIP MCP1252, MCP1253 Technical data

M
Low Noise, Positive-Regulated Charge Pump
MCP1252/3
Features
• Inductorless, Buck/Boost, DC/DC Converter
• Low Power: 80 µA (Typical)
• High Output Voltage Accuracy:
- ±2.5% (V
• 120 mA Output Current
• Wide Operating Temperature Range:
- -40°C to +85°C
• Thermal Shutdown and Short-Circuit Protection
• Uses Small Ceramic Capacitors
• Switching Frequency:
- MCP1252: 650 kHz
- MCP1253: 1 MHz
• Low Power Shutdown Mode: 0.1 µA (Typical)
• Shutdown Input Compatible with 1.8V Logic
Range: 2.0V to 5.5V
•V
IN
• Selectable Output Voltage (3.3V or 5.0V) or Adjustable Output Voltage
• Space-saving, 8-Lead MSOP
• Soft-Start Circuitry to Minimize In-Rush Current
Fixed)
Applications
• White LED Backlighting
• Color Display Bias
• Local 3V-to-5V Conversions
• Flash Memory Supply Voltage
• SIM Interface Supply for GSM Phones
• Smart Card Readers
• PCMCIA Local 5V Supplies
Description
The MCP1252/3 are inductorless, positive-regulated charge pump DC/DC converters. The devices generate a regulated fixed (3.3V or 5.0V) or adjustable output voltage. They are specifically designed for applications requiring low noise and high efficiency and are able to deliver up to 120 mA output current. The devices allow the input voltage to be lower or higher than the output voltage, by automatically switching between buck/ boost operation.
The MCP1252 has a switching frequency of 650 kHz, avoiding interference with sensitive IF bands. The MCP1253 has a switching frequency of 1 MHz and allows the use of smaller capacitors than the MCP1252, thus saving board space and cost.
Both devices feature a power-good output that can be used to detect out-of-regulation conditions. Extremely low supply current and low external parts count (three capacitors) make these devices ideal for small, battery­powered applications. A shutdown mode is also pro­vided for further power reduction. The MCP1252 and MCP1253 feature thermal and short-circuit protection and are offered in space-saving, 8-lead, MSOP packages.
Package Types
MSOP (FIXED)
PGOOD
V
OUT
V
GND
1
MCP1252
2
MCP1253
IN
3
4
8
7
6
5
SELECT
SHDN
C+
C-
MSOP (ADJUSTABLE)
PGOOD
V
OUT
V
IN
GND
2002 Microchip Technology Inc. DS21752A-page 1
1
2
MCP1252
3
MCP1253
4
8
7
6
5
FB
SHDN
C+
C-
MCP1252/3
Functional Block Diagram
MCP1252-33X50 MCP1253-33X50
PGOOD
V
OUT
V
GND
­+
+
84 mV
-
1.21V
+
-
Switch
Control
+
200 mV
IN
140 kΩ
173 kΩ
+
100 kΩ
+
SELECT
SHDN
C+ C-
MCP1252-ADJ MCP1253-ADJ
PGOOD
V
OUT
V
GND
­+
+
84 mV
-
+
-
Switch
Control
+
200 mV
IN
1.21V
+
+
FB
SHDN
C+ C-
DS21752A-page 2 2002 Microchip Technology Inc.
MCP1252/3

1.0 ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings †
Power Supply Voltage, VIN...............................................6.0V
Voltage on Any Pin w.r.t. GND ............... -0.3V to (V
Output Short Circuit Duration ................................continuous
Storage Temperature Range.........................-65°C to +150°C
Ambient Temperature with Power Applied....-55°C to +125°C
Junction Temperature ................................................. +150°C
ESD Ratings:
Human Body Model (1.5 kΩ in Series with 100 pF ...... ≥ 4kV
Machine Body Model (200 pF, No Series Resistance ≥ 400V
+ 0.3V)
IN
PIN FUNCTION TABLE
Name Function
PGOOD Open-Drain Power GOOD Output
V
OUT
V
IN
GND Ground Terminal
C- Flying Capacitor Negative Terminal
C+ Flying Capacitor Positive Terminal
SHDN
SELECT
FB
Regulated Output Voltage
Power Supply Input
Shutdown Mode, Active-Low Input
Output Voltage Select Pin. (MCP1252-33X50, MCP1253-33X50)
Feedback Input Pin for Adjustable Output (MCP1252-ADJ, MCP1253-ADJ)
†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 listings of this specification is not implied. Expo­sure to maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, all limits are specified for TA = -40°C to +85°C, SHDN = VIN,
C
= C
OUT
= 10 µF, C
IN
Parameters Sym Min Typ Max Units Conditions
Selectable Output - MCP1252-33X50, MCP1253-33X50: SELECT = V
Supply Voltage V
Output Voltage Accuracy V
Output Current I
SELECT Logic Input Voltage High V
Selectable Output - MCP1252-33X50, MCP1253-33X50: SELECT = GND, V
Supply Voltage V
Output Voltage Accuracy V
Output Current I
SELECT Logic Input Voltage Low V
Adjustable Output - MCP1252-ADJ, MCP1253-ADJ
Supply Voltage V
Output Voltage Adjustment Range V
FB Regulation Voltage V
ALL DEVICES
Supply Current I
Output Short-Circuit Current I
Shutdown Current I
Power Efficiency η —8168—%%V
Logic Input Voltage Low V
SHDN
Logic Input Voltage High V
SHDN
PGOOD Threshold Voltage V
PGOOD Hysteresis V
FLY
= 1 µF, I
= 10 mA. Typical values are for TA = +25°C.
OUT
IN
OUT
OUT
IH
IN
OUT
OUT
IL
IN
OUT
FB
DD
SC
SHDN
IL
IH
TH
HYS
2.1 — 5.5 V
-2.5 +/-0.5 +2.5 % 2.3V ≤ VIN < 2.5V, I
80
120
100 150
1.4 — — V MCP1252-33X50, MCP1253-33X50
2.7 — 5.5 V
-2.5 +/-0.5 +2.5 % 2.7V ≤ V
40
120
80
150
— — 0.4 V MCP1252-33X50, MCP1253-33X50
2.0 — 5.5 V
1.5 — 5.5 V V
1.18 1.21 1.24 V MCP1252-ADJ, MCP1253-ADJ
—60120µANo load
—200 —mAV
— 0.1 2.0 µA SHDN = 0V
—— 0.4V
1.4 — — V
—0.93V
—0.04V
OUT
OUT
, V
OUT
= 3.3V
IN
2.5V ≤ V
—mAmA2.3V ≤ VIN < 2.5V
2.5V ≤ V
= 5.0V
OUT
3.0V ≤ V
—mAmA2.7V ≤ VIN < 3.0V
3.0V ≤ V
OUT(MAX)
OUT
= 3.0V, V
IN
V
= 3.6V, V
IN
I
OUT
—V
—V
≤ 5.5V, I
IN
≤ 5.5V
IN
< 3.0V, I
IN
≤ 5.5V, I
IN
≤ 5.5V
IN
< 2 x V
= GND, foldback current
OUT
OUT
=120 mA
OUT
OUT
OUT
OUT
IN
= 5V = 5V
≤ 80 mA
≤ 120 mA
≤ 40 mA
≤ 120 mA
2002 Microchip Technology Inc. DS21752A-page 3
MCP1252/3
AC CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, all limits are specified for T
V
= 2.7V to 5.5V, SELECT = GND, SHDN = VIN, C
IN
Typical values are for T
= +25°C.
A
IN
= C
OUT
= 10 µF, C
FLY
= 1 µF, I
Parameters Sym Min Typ Max Units Conditions
Internal Oscillator Frequency F
Ripple Voltage V
V
Wake-Up Time From Shutdown T
OSC
RIP
WKUP
520 800
—5045—mV
—200
650
1000
780
1200
—µsec
300
TEMPERATURE SPECIFICATIONS
Parameters Symbol Min Typ Max Units Conditions
Temperature Ranges:
Specified Temperature Range T
Maximum Operating Junction Temperature
Storage Temperature Range T
Thermal Package Resistances:
Thermal Resistance, 8 Pin MSOP θ
A
T
J
A
JA
-40 — +85 °C
— — +125 °C
-65 — +150 °C
— 206 — °C/W Single-Layer SEMI G42-88
= -40°C to +85°C,
A
= 10 mA.
OUT
kHz
MCP1252
kHz
MCP1253
MCP1252
p-p
p-p
MCP1253
mV
SELECT = V
µsec
SELECT = GND V
= 3.6V, I
IN
SHDN
= V
V
from 0 to 90% Nominal
Regulated Output Voltage
Board, Natural Convection
IN
IH(MIN)
= 10 mA,
,
DS21752A-page 4 2002 Microchip Technology Inc.
MCP1252/3

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
= 3.6V, TA = 25°C, CIN = C
IN
= 10µF, C
= 1µF, all capacitors X7R ceramic.
FLY
5.05
5.04
10 mA
5.03
5.02 80 mA 120 mA
5.01
Output Voltage (V)
5.00
4.99
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Supply Voltage (V)
MCP125 2-33X50 SELECT = GND
OUT
= 5.0V
V

FIGURE 2-1: Output Voltage vs. Supply Voltage (MCP1252-33X50).

.
3.34
3.33
3.32
Output Voltage (V)
MCP125 2-33X50 SELECT = V V
3.31
OUT
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
IN
= 3.3V
Supply Voltage (V)
80 mA
120 mA
10 mA
100
90 80 70 60 50 40 30 20
Percent Efficiency (%)
10
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Supply Voltage (V)
10 mA
80 mA
120 mA
MCP125 2-33X50 SELECT = GND
= 5.0V
V
OUT

FIGURE 2-4: Percent Efficiency vs. Supply Voltage (MCP1252-33X50).

100
90 80 70 60 50 40 30 20
Power Efficiency (%)
10
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
10 mA
80 mA
120 mA
Supply Voltage (V)
MCP125 2-33X50 SELECT = V V
= 3.3V
OUT
IN

FIGURE 2-2: Output Voltage vs. Supply Voltage (MCP1252-33X50).

3.02
3.01
10 mA
3.00
Output Voltage (V)
2.99
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
80 mA
120 mA
Supply Voltage (V)
MCP125 2-ADJ
= 3.0V
V
OUT

FIGURE 2-3: Output Voltage vs. Supply Voltage (MCP1252-ADJ).

FIGURE 2-5: Power Efficiency vs. Supply Voltage (MCP1252-33X50).

100
90 80 70 60 50 40 30 20
Power Efficiency (%)
10
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
10 mA
80 mA
120 mA
Supply Voltage (V)
MCP125 2-ADJ
= 3.0V
V
OUT
FIGURE 2-6: Power Efficiency vs. Supply Voltage
(MCP1252-ADJ).
2002 Microchip Technology Inc. DS21752A-page 5
MCP1252/3
Note: Unless otherwise indicated, V
5.03
5.02
5.01
5.00
Output Voltage (V)
4.99
4.98
MCP125 3-33X50
MCP125 2-33X50
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (°C)
= 3.6V, TA = 25°C, CIN = C
IN
SELECT = GND
= 5.0V
V
OUT
I
= 120 mA
OUT

FIGURE 2-7: Output Voltage vs. Temperature (MCP1252-33X50, MCP1253-33X50).

3.33
3.32
3.31
3.30
3.29
Output Voltage (V)
3.28
MCP125 3-33X50
MCP125 2-33X50
SELECT = V V
= 3.3V
OUT
I
= 120 mA
OUT
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (°C)
= 10 mF, C
80
75
70
65
60
55
50
Supply Current (uA)
45
40
-40 -25 -10 5 20 35 50 65 80 95 110 125
= 1 mF, all capacitors X7R ceramic.
FLY
VIN = 5.5V
VIN = 3.6V
VIN = 2.7V
VIN = 2.3V
Temperature (°C)
MCP1253-33X50 SELECT = GND V
= 5.0V, I
OUT
OUT
= 0 mA

FIGURE 2-10: Quiescent Current vs. Temperature (MCP1253-33X50).

80
VIN = 5.5V
75
70
65
60
IN
55
50
Supply Current (uA)
45
40
VIN = 3.6V
VIN = 2.7V
VIN = 2.3V
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (°C)
MCP1252-33X50 SELECT = GND V
= 5.0V, I
OUT
OUT
= 0 mA

FIGURE 2-8: Output Voltage vs. Temperature (MCP1252-33X50, MCP1253-33X50).

FIGURE 2-9: Line Transient Response.

FIGURE 2-11: Quiescent Current vs.
Temperature (MCP1252-33X50).

FIGURE 2-12: Load Transient Response.

DS21752A-page 6 2002 Microchip Technology Inc.
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