Microchip TC962 Handleiding

Microchip Niet gecategoriseerd TC962

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2001-2012 Microchip Technology Inc. DS21484D-page 1
TC962
Features:
• Pin Compatible With TC7662/ICL7662/SI7661
• High Output Current 80 mA
• No External Diodes Required
• Wide Operating Range 3V to 18V
• Low Output Impedance 28 Typ.
• No Low Voltage Terminal Required
• Application Zener On-Chip
• OSC Frequency Doubling Pin Option for Smaller
Output Capacitors
Applications:
• Laptop Computers
• Disk Drives
• Process Instrumentation
•P-Based Controllers
Device Selection Table
General Description:
The TC962 is an advanced version of the industry
standard TC7662 high voltage DC-to-DC converter.
Using improved design techniques and CMOS
construction, the TC962 can source as much as 80 mA
versus the 7662’s 20 mA capability.
As an inverter, the TC962 can put out voltages as high
as 18V and as low as 3V without the need for external
diodes. The output impedance of the device is a low
28 (with the proper capacitors), voltage conversion
efficiency is 99.9%, and power conversion efficiency is
97%.
The low voltage terminal (pin 6) required in some
TC7662 applications has been eliminated. Grounding
this terminal will double the oscillator frequency from 12
kHz to 24 kHz. This will allow the use of smaller
capacitors for the same output current and ripple, in
most applications. Only two external capacitors are
required for inverter applications. In the event an
external clock is needed to drive the TC962 (such as
paralleling), driving this pin directly will cause the
internal oscillator to sync to the external clock.
Pin 1, which is used as a test pin on the 7662, is a
voltage reference Zener on the TC962. This Zener (6.4V
at 5 mA) has a dynamic impedance of 12 and is
intended for use where the TC962 is supplying current to
external regulator circuitry and a reference is needed for
the regulator circuit. (See Section 3.0 “Applications
Information” Applications Information).
The TC962 is compatible with the LTC1044, SI7661
and ICL7662. It should be used in designs that require
greater power and/or less input to output voltage drop.
It offers superior performance over the ICL7660S.
Package Type
Part
Number Package
Operating
Temp.
Range
TC962COE 16-Pin SOIC Wide 0°C to +70°C
TC962CPA 8-Pin Plastic DIP 0°C to +70°C
TC962EPA 8-Pin Plastic DIP -40°C to +85°C
TC962IJA 8-Pin CERDIP -25°C to +85°C
TC962MJA 8-Pin CERDIP -55°C to +125°C
VDD
1
2
3
4
5
6
7
8
16
13
12
11
10
9
NC
GND
COSC
NC
15
14
NC
NC
NC
TC962COE
NC
NC
Zener
Cathode
NC
FREQ x 2
16-Pin SOIC Wide
C+
C–VOUT
1
2
3
4
8
7
6
5
FREQ x 2GND
TC962CPA
TC962EPA
TC962IJA
TC962MJA
C+
C–VOUT
8-Pin CERDIP
8-Pin DIP
•
Zener
Cathode
COSC
VDD
High Current Charge Pump DC-to-DC Converter
TC962
DS21484D-page 2 2001-2012 Microchip Technology Inc.
Functional Block Diagram
+
–
Comparator
with Hysteresis
C
F/F
Q
Q
V
REF
Level
Shift
Level
Shift
Level
Shift
Level
Shift
V
DD
P SW1
CAP
C
P
External
N SW4
N SW2
N SW3
CAP
C
R
EXT
R
L
V
OUT
I I
OSC/C–
Timing
Zener
Cathode
FREQ x 2
+
GND
–
8
2
3
OUT
5
4
7
1
6.4V
6
+
+
TC962
2001-2012 Microchip Technology Inc. DS21484D-page 3
TC962
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage (VDD to GND) ..............................+18V
Input Voltage Any Pin
......................... (VDD +0.3) to (VSS -0.3) (Note 1)
Current Into Any Pin........................................... 10 mA
ESD Protection ................................................±2000V
Output Short Circuit ........... Continuous (at 5.5V Input)
Package Power Dissipation (T
A 70°C)
SOIC ....................................................... 760 mW
PDIP........................................................ 730 mW
CERDIP .................................................. 800 mW
Package Thermal Resistance
CERDIP, RJ-A .........................................90°C/W
PDIP, RJ-A ............................................ 140°C/W
Operating Temperature Range
CPA, COE ....................................... 0°C to +70°C
IJA................................................ -25°C to +85°C
EPA .............................................. -40°C to +85°C
MJA............................................ -55°C to +125°C
Storage Temperature Range .............-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 functional
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.
TC962 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VDD = 15V, TA = 25°C (See Figure ) unless otherwise noted.
Symbol Parameter Min Typ Max Units Test Conditions
VDD Supply Voltage 3 — 18 V
ISSupply Current
VDD = 15V
VDD = 5V
—
—
—
—
—
—
—
—
510
560
650
190
210
210
—
700
—
—
—
—
—
A RL =
TA = +25°C
0 T  A 70°C
-55°C TA 125°C
TA = +25°C
0 T  A 70°C
-55°C TA 125°C
ROOutput Source
Resistance
—
—
—
32
35
—
37
40
50
IL = 20 mA, VDD = 15V
IL = 80 mA, VDD = 15V
IL = 3 mA, VDD = 5V
FOSC Oscillator Frequency —
—
12
24
—
—
kHz Pin 6 Open
Pin 6 GND
PEFF Power Efficiency 93
—
97
—
—
—
% RL = 2 k
VDEF Voltage Efficiency 99
—
96
99.9
—
—
—
—
—
% RL =
Over temperature range
VZZener Voltage 6.0 6.2 6.4 V I Z = 5 mA
ZZT Zener Impedance — 12 — IL = 2.5 mA to 7.5 mA
Note 1: Connecting any input terminal to voltages greater than V + or less than GND may cause destructive latch-up. It is recommended that no
inputs from sources operating from external supplies be applied prior to “power-up” of the TC962.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: TC962

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