2002 Microchip Technology Inc. DS21366B-page 1
M
TC1219/TC1220
Features
• Charge Pumps in 6-Pin SOT-23A Package
• >95% Voltage Conversion Efficiency
• Voltage Inversion and/or Doubling
• Operates from +2.5V to +5.5V
• Up to 25mA Output Current
• Only Two External Capacitors Required
• Low Power Consumption
• Power-Savi ng Shutdown Mode
• TC1220 Compatible with 1.8V Logic Systems
Applications
• LCD Panel Bias
• Cellular Phones
• Pagers
• PDAs, Portable Dataloggers
• Battery-Powered Devices
Device Selection Table
Package Type
General Description
The TC1219/TC1220 are CMOS “charge-pump”
voltage converters in ultra-small 6-Pin SOT-23A
packages. They invert and/or double an input voltage
which can range from +2.5V to +5.5V. Conversion
efficiency is typically >95%. Switching frequency is
12kHz for the TC1219, 35kHz for the TC1220. When
the shut down pin is h eld at a lo gic lo w, the devic e goes
into a very low power mode of operation, consuming
less than 1µA of supply current.
External c omponent requiremen t is only two capac itors
for standard voltage inverter applications. With a few
additional components a positive doubler can also be
built. All other circuitry, including control, oscillator,
power M OSFETs are i ntegrated on -chip. Typica l supply
currents are 60µA (TC1219), 115µA (TC1220).
All devices are available in 6-pin SOT-23A surface
mount packages.
Functional Block Diagram
Part
Numbe r
Package
Osc.
Freq.
(kHz)
Operating
Temp.
Range
TC1219ECH 6-Pin SOT-23A 12 -40°C to +85°C
TC1220ECH 6-Pin SOT-23A 35 -40°C to +85°C
C
+
C
–
TC1219ECH
TC1220ECH
123
54
V
IN
SHDN
GND
6-Pin SOT-23A
NOTE: 6-Pin SOT-23A is equivalent to the EIAJ SC-74
OUT
6
TC1219
TC1220
V
IN
V
–
Output
C
+
C
–
C1
C2
Input
GND
OUT
SHDN
ON
OFF
+
+
Negative Voltage Inverter
Switched Ca pacitor Voltag e Converter s with Shutdown in SOT Pack ages
TC1219/TC1220
DS21366B-page 2 2002 Microchip Technology Inc.
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage (V
IN
to GND)....................... +6.0V, -0.3V
Output Voltage (OUT to GND).................. -6.0V, +0.3V
Current at OUT Pin..............................................50mA
Short-Circuit Duration – OUT to GND............Indefinite
Power Dissipation (T
A
≤ 70°C)
6-Pin SOT-23A .........................................240mW
Operati ng Tempe ratu re Range...... ...... .-40°C to +85°C
Storage Temperature (Unbiased).......-65°C to +150°C
Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and funct ional operation of the device
at these or any other conditions above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
TC1219/TC1220 ELECTR ICAL SPECIF ICA TI ONS
Electrical Characteristics: T
A
= -40°C to +85°C, V
IN
= +5V, C1 = C2 = 10µF, (TC1219), C1 = C2 = 3.3µF (TC1220), T
A
= 25°C
unless otherwise noted.
Symbol Parameter Min Typ Max Units Device Test Conditions
I
DD
Supply Current —
—
60
115
115
325
µA TC1219
TC1220
I
SHDN
Shutdown Supply Current — 0.1 1.0 µA SHDN = GND, V
IN
= 5V (Note 2)
V
MIN
Minimum Supply Voltage 2.5 —— VR
LOAD
= 1kΩ
V
MAX
Maximum Supply Voltage ——5.5 V R
LOAD
= 1kΩ
F
OSC
Oscillator Frequency 6
19
12
35
20
56.3
kHz TC1219
TC1220
V
IH
SHDN Input Logic High —
1.5
1.8
1.5
—
—
—
—
—
—
—
—
V
TC1219
TC1220
R
LOAD
= ∞
V
IN
= V
MIN
to 3V
V
IN
= >3V to V
MAX
V
IN
= V
MIN
to V
MAX
V
IL
SHDN Input Logic Low ——0.5 V V
IN
= V
MIN
to V
MAX
P
EFF
Pow e r Effi c i e nc y —
—
96
95
—
—
%R
LOAD
= 1kΩ
V
EFF
Voltage Conversion Efficiency 95 99.9 — %R
LOAD
= ∞
R
OUT
Output Resistance — 25 65 Ω TC1219/TC1220 I
LOAD
= 0.5mA to 25mA (Note 1)
Note 1: Capacitor contribution is approximately 20% of the output impedance [ESR = 1/ pump frequency x capacitance].
2: V
IN
is guaranteed to be disconnected from OUT when the converter is in shutdown..