Microchip TC1044S Manual

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TC1044S

TC1044S-12 9/16/96

EVALUATION

KIT

AVAILABLE

Charge Pump DC-TO-DC Voltage Converter

FEATURES

■Converts +5V Logic Supply to ±5V System

■Wide Input Voltage Range .................... 1.5V to 12V

■Ecient Voltage Conversion ......................... 99.9%

■Excellent Power Eciency ............................... 98%

■Low Power Consumption ............ 80µA @ V IN = 5V

■Low Cost and Easy to Use

— Only Two External Capacitors Required

■RS-232 Negative Power Supply

■Available in 8-Pin Small Outline (SOIC) and 8-Pin

Plastic DIP Packages

■Improved ESD Protection ..................... Up to 10kV

■No External Diode Required for High Voltage

Operation

■Frequency Boost Raises F OSC to 45kHz

GENERAL DESCRIPTION

The TC1044S is a pin-compatible upgrade to the Indus-

try standard TC7660 charge pump voltage converter. It

converts a +1.5V to +12V input to a corresponding –1.5V

to –12V output using only two low cost capacitors, eliminat-

ing inductors and their associated cost, size and EMI.

Added features include an extended supply range to 12V,

and a frequency boost pin for higher operating frequency,

allowing the use of smaller external capacitors.

The on-board oscillator operates at a nominal frequency

of 10kHz. Frequency is increased to 45kHz when pin 1 is

connected to V+. Operation below 10kHz (for lower supply

current applications) is possible by connecting an external

capacitor from OSC to ground (with pin 1 open).

The TC1044S is available in both 8-pin DIP and

8-pin small outline (SOIC) packages in commercial and

extended temperature ranges.

FUNCTIONAL BLOCK DIAGRAM

TC1044S

GND

INTERNAL

VOLTAGE

REGULATOR

OSCILLATOR

VOLTAGE–

LEVEL

TRANSLATOR

V+CAP +

8 2

OSC

LOGIC

NETWORK

VOUT

CAP –

BOOST

ORDERING INFORMATION

Part No. Package Temp. Range

TC1044SCOA 8-Pin SOIC 0° °C to +70 C

TC1044SCPA 8-Pin Plastic DIP 0° °C to +70 C

TC1044SEOA 8-Pin SOIC – 40° °C to +85 C

TC1044SEPA 8-Pin Plastic DIP – 40° °C to +85 C

TC1044SIJA 8-Pin CerDIP – 25° °C to +85 C

TC1044SMJA 8-Pin CerDIP – 55° °C to +125 C

TC7660EV Charge Pump Family Evaluation Kit

PIN CONFIGURATION (DIP AND SOIC)

TC1044SCPA

TC1044SEPA

TC1044SIJA

TC1044SMJA

BOOST

CAP+

GND

CAP–VOUT

LOW

VOLTAGE (LV)

OSC

TC1044SCOA

TC1044SEOA

BOOST

CAP +

GND

CAP –VOUT

LOW

VOLTAGE (LV)

OSC

TC1044S-12 9/16/96

TC1044S

Charge Pump DC-TO-DC Voltage Converter

Package Power Dissipation (TA ≤ 70°C) (Note 2)

8-Pin CerDIP ..................................................800mW

8-Pin Plastic DIP .............................................730mW

8-Pin SOIC .....................................................470mW

Operating Temperature Range

C Sux .................................................. 0°C to +70°C

I Sux ............................................... – 25°C to +85°C

E Sux ............................................. – 40°C to +85°C

M Sux ........................................... – 55°C to +125°C

Storage Temperature Range ................ – 65°C to +150°C

ELECTRICAL CHARACTERISTICS: TA = +25°C, V+ = 5V, COSC = 0, Test Circuit (Figure 1), unless otherwise

indicated.

Symbol Parameter Test Conditions Min Typ Max Unit

I+Supply Current RL = ∞— 80 160 µA

0°C < TA < +70°C — — 180

– 40 C < T°A < +85°C — — 180

– 55 C < T°A < +125°C — — 200

I+Supply Current 0°C < TA < +70° µC — — 300 A

(Boost Pin = V+) – 40°C < TA < +85°C — — 350

– 55 C < T°A < +125°C — — 400

V+

H2 Supply Voltage Range, High Min ≤ TA ≤ Max, 3 — 12 V

RL = 10 k , LV OpenΩ

V+

L2 Supply Voltage Range, Low Min ≤ TA ≤ Max, 1.5 — 3.5 V

RL = 10 kΩ, LV to GND

ROUT Output Source Resistance IOUT = 20mA — 60 100 Ω

IOUT = 20mA, 0°≤C TA ≤ +70°C — 70 120

IOUT = 20mA, –40°≤C TA ≤ +85°C — 70 120

IOUT = 20mA, –55°≤C TA ≤ +125°C — 105 150

V+ = 2V, IOUT = 3 mA, LV to GND

0 C °≤ TA ≤ +70°C — — 250 Ω

– 55 C T°≤A +125≤°C — — 400

FOSC Oscillator Frequency Pin 7 open; Pin 1 open or GND — 10 — kHz

Boost Pin = V+— 45 —

PEFF Power Eciency RL = 5 kΩ; Boost Pin Open 96 98 — %

TMIN < TA < T

MAX ; Boost Pin Open 95 97 —

Boost Pin = V+— 88 —

VOUT EFF Voltage Conversion Eciency RL = ∞99 99.9 — %

ZOSC Oscillator Impedance V+ = 2V — 1 — MΩ

V+ = 5V — 100 — kΩ

NOTES: 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 TC1044S.

2. Derate linearly above 50° °C by 5.5mW/ C.

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage ......................................................... +13V

LV, Boost and OSC Inputs

Voltage (Note 1) ......................... – 0.3V to (V++ 0.3V)

for V+

< 5.5V

(V+ – 5.5V) to (V++ 0.3V)

for V+ > 5.5V

Current Into LV (Note 1) ...................... 20µA for V+ > 3.5V

Output Short Duration (VSUPPLY 5.5V) ......... Continuous≤

Lead Temperature (Soldering, 10 sec) ................. +300°C

*Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static elds. 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 specications is not implied. Exposure to absolute maximum rating

conditions for extended periods may aect device reliability.