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PDF TC1220 Data sheet ( Hoja de datos )
| Número de pieza | TC1220 | |
| Descripción | (TC1219) Switched Capacitor Voltage Converters with Shutdown in SOT Packages | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TC1220 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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M TC1219/TC1220
Switched Capacitor Voltage Converters with Shutdown in SOT Packages
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-Saving 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
Part
Number
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
Package Type
6-Pin SOT-23A
C+ SHDN GND
6 54
TC1219ECH
TC1220ECH
1
OUT
2
VIN
3
C–
NOTE: 6-Pin SOT-23A is equivalent to the EIAJ SC-74
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 shutdown pin is held at a logic low, the device goes
into a very low power mode of operation, consuming
less than 1µA of supply current.
External component requirement is only two capacitors
for standard voltage inverter applications. With a few
additional components a positive doubler can also be
built. All other circuitry, including control, oscillator,
power MOSFETs are integrated on-chip. Typical supply
currents are 60µA (TC1219), 115µA (TC1220).
All devices are available in 6-pin SOT-23A surface
mount packages.
Functional Block Diagram
Negative Voltage Inverter
C+ VIN
+
C1 TC1219
TC1220
C–
Input
ON
SHDN
OFF
GND
OUT
C2
+
V–
Output
2002 Microchip Technology Inc.
DS21366B-page 1
1 page  
4.0 APPLICATIONS INFORMATION
4.1 Output Voltage Considerations
The TC1219/TC1220 perform voltage conversion but
do not provide regulation. The output voltage will droop
in a linear manner with respect to load current. The
value of this equivalent output resistance is approxi-
mately 25Ω nominal at +25°C and VIN = +5V. VOUT is
approximately -5V at light loads, and droops according
to the equation below:
VDROP = IOUT x ROUT
VOUT = – (VIN – VDROP)
4.2 Charge Pump Efficiency
The overall power efficiency of the charge pump is
affected by four factors:
1. Losses from power consumed by the internal
oscillator, switch drive, etc. (which vary with
input voltage, temperature and oscillator
frequency).
2. I2R losses due to the on-resistance of the
MOSFET switches on-board the charge pump.
3. Charge pump capacitor losses due to effective
series resistance (ESR).
4. Losses that occur during charge transfer (from
the commutation capacitor to the output
capacitor) when a voltage difference between
the two capacitors exists.
Most of the conversion losses are due to factors (2) and
(3) above. These losses are given by Equation 4-1(b).
EQUATION 4-1:
a) PLOSS (2, 3) = IOUT2 x ROUT
b) where ROUT = [ 1 / [fOSC(C1) ] + 8RSWITCH +
4ESRC1 + ESRC2]
The 1/(fOSC)(C1) term in Equation 4-1(b) is the
effective output resistance of an ideal switched
capacitor circuit (Figure 4-1 and Figure 4-2). The value
of RSWITCH can be approximated at 0.5Ω for the
TC1219/TC1220.
TC1219/TC1220
The remaining losses in the circuit are due to factor (4)
above, and are shown in Equation 4-2. The output
voltage ripple is given by Equation 4-3.
EQUATION 4-2:
PLOSS(4) = [(0.5)(C1) (VIN2 – VOUT2) + (0.5)
(C2) (VRIPPLE2 – 2VOUT VRIPPLE)] x fOSC
EQUATION 4-3:
VRIPPLE = [ IOUT / 2 x ( fOSC) (C2) ] + 2 ( IOUT) (ESRC2)
FIGURE 4-1:
f
V+
IDEAL SWITCHED
CAPACITOR MODEL
VOUT
C1 C2 RL
FIGURE 4-2:
EQUIVALENT OUTPUT
RESISTANCE
REQUIV
V+
REQUIV = 1
f x C1
C2
VOUT
RL
2002 Microchip Technology Inc.
DS21366B-page 5
5 Page 
6.0 PACKAGING INFORMATION
6.1 Package Marking Information
TC1219/TC1220
1 & 2 = part number code + temperature range
(two-digit code)
TC1219/TC1220
TC1219ECH
TC1220ECH
Code
AM
AN
ex: 1219ECH = A M
3 represents year and quarter code
4 represents production lot ID code
6.2 Taping Form
Component Taping Orientation for 6-Pin SOT-23A (EIAJ SC-74) Devices
User Direction of Feed
Device
Marking
PIN 1
Standard Reel Component Orientation
For TR Suffix Device
(Mark Right Side Up)
Carrier Tape, Number of Components Per Reel and Reel Size
Package
6-Pin SOT-23A
Carrier Width (W)
8 mm
Pitch (P)
4 mm
Part Per Full Reel
3000
Reel Size
7 in
2002 Microchip Technology Inc.
DS21366B-page 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TC1220.PDF ] | |
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