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Impala Linear Corporation
ILC6660
General Description The ILC6660 monolithic, charge-pump voltage inverter converts a +1.5V to +5.5V input to a corresponding -1.5V to -5.5V output. Using only two low-cost capacitors, the charge pump's 100mA output replaces switching regulators, eliminating inductors and their associated cost, size, and EMI. Greater than 90% efficiency over most of its load-current range combined with a typical operating current of only 120A provides ideal performance for both battery-powered and board-level voltage conversion applications. The ILC6660 can also double or split the output voltage of an input powered supply or battery, providing +9.5V or +2.3V at 100mA from a +5V input. A frequency control (FC) pin selects either 5kHz typ or 50kHz typ (30kHz min) operation to optimize capacitor size and quiescent current. The Oscillator frequency can also be driven with an external clock. The ILC6660 is available in both 8-pin DIP and small-outline packages in commercial and extended temperature ranges. * * * * * * * *
Advance
CMOS Monolithic Voltage Converter
Features 0.5V Typ Loss at 100mA Load Low 120A Operating Current 5.0 Typ Output Impedance Guaranteed ROUT < 10 for C1 = C2 = 100F Inverts, Doubles or Splits Input Supply Voltage Selectable Oscillator Frequency: 5kHz/50kHz 90% Typ Conversion Efficiency at 100mA lOUT 8-pin SOIC package. Applications * * * * * Laptop Computers Medical Instruments Interface Power Supplies Hand-Held Instruments Operational-Amplifier Power Supplies
Typical Circuits
+VIN 1.5V to 5.5V
1 2
C1 100F to 470F
FC CAP+
V+ SYNC
8 7 6 5
RL C2 100F to 470F
Ordering Information* TA = 40C to = 85C
INVERTED NEGATIVE VOLTAGE OUTPUT
+
3 4
ILC6660
VSS CAPLV
ILC6660IK
8-pin SOIC
VSH
VOLTAGE INVERTER
1 1
C1 100F to 470F +VIN 2.5 TO 5.5V FC CAP+ V+ SYNC
8 7 6
FC CAP+
V+ SYNC
8 7 6 5
VIN 2.5V to 5.5V
2
+
+
3 4
ILC6660
VSS CAPLV VSH
C2 100F to 470F
C1 100F to 470F
2
+
3
ILC6660
VSS CAPLV
5
DOUBLED POSITIVE VOLTAGE OUTPUT
SPLIT POSITIVE VOLTAGE OUTPUT
4
+
VSH
C2 100F to 470F
POSITIVE VOLTAGE DOUBLER
POSITIVE VOLTAGE SPLITTER
Impala Linear Corporation
ILC6660 1.8
(408) 574-3939
www.impalalinear.com
May 2000
1
CMOS Monolithic Voltage Converter
Advance
Pin-Package Configurations
FC 1 CAP+ 2 ILC6660 VSS 3 CAP- 4 SOIC
8
V+
7 SYNC 6 LV 5 VSH
Pin Functions ILC6660
Pin Number 1 Pin Name FC Inverter Frequency Control for Internal Oscillator, FC open, fOSC =5kHz typ; FC = V+, fOSC= 50kHz typ. FC has no effect when SYNC pin is driven externally. Charge-Pump Capacitor, Positive Terminal Power-Supply Ground Input Charge-Pump Capacitor, Negative Terminal Output, Negative Voltage Splitter Same as Inverter Doubler Same as Inverter
2 3 4 5
CAP+ VSS CAPVSH
Same as Inverter Power-Supply PositiveVoltage Output Same as Inverter Power-Supply Ground Input LV must be left open for all input voltages Same as inverter, however, do not use SYNC in voltagesplitting mode Positive Voltage Input
Same as Inverter Power-Supply Positive Voltage Input Same as Inverter Power-Supply Ground Input LV must be left open for all input voltages. Same as inverter, however, do not use SYNC in voltagedoubling mode. Positive Voltage Output
6
LV
Low-Voltage Operation Input. Tie LV to VSS when input voltage is less than 2V. Above 2V, LV must be left open. Oscillator Control Input. SYNC is connected to an internal 15pF capacitor. An external Oscillator may be connected to overdrive SYNC via a 2...5nF capacitor. SYNC shall not be connected to ground. Power-Supply Positive Voltage Input
7
SYNC
8
V+
Impala Linear Corporation
ILC6660 1.8
(408) 574-3939
www.impalalinear.com
May 2000
2
CMOS Monolithic Voltage Converter
Advance
Absolute Maximum Ratings (Note 1)
Parameter Supply Voltage (V+ to VSS, or VSS to VSH) LV, FC and OSC Input Voltage VSH and V+ Continues Output Current Output Short-Circuit Durations to GND (Note 2) Continuous Power Dissipation (T = +85C) Operation Temperature Ranges Maximum Junction Temperature Storage Temperature Range Lead Temperature (soldering, 10sec) Package Thermal Resistance JA Symbol VIN VIN IVSH ISC PD TA TJ(max) Tstg Ratings +6 VSH -0.3 to V+ +0.3 120 Not internally protected 470 -40 to +85 150 -40 to +125 300 138 Units V V mA A mW C C C C C/W
Note 1. Absolute maximum ratings indicate limits which, when exceeded, may result in damage to the component. Electrical specifications do not apply when operating the device outside its rated operating conditions. Note 2. VSH must not be shorted to VSS or V+, even instantaneously, or device damage may result.
Electrical Characteristics ILC6660IK
Unless otherwise specified, all limits are at TA = 25C; V+ = 5V, C1 = C2 = 100F, test circuit of Figure 1, FC = open. Boldface limits apply over the operating temperature range. (Note 3) Min Parameter Symbol Conditions Typ Max Units 3.0 Operating Supply Voltage VIN RL = 1k, LV open 5.5 V 1.5 RL = 1k, LV = VSS 2 V 2 RL = 1k, LV open Doubler or Splitter 5.5 Supply Current IIN VSH = open, FC + open, LV = open 120 300 A VSH = open , FC = V+, LV = open 1 2 mA 100 Output Current IVSH VSH more negative than -4V mA Output Resistance (Note 4) RVSH IL = 100mA 5.0 10 2.5 Oscillator Frequency fOSC FC = open 5.0 10.0 kHZ 30 FC = V+ 50 90.0 kHZ Power Efficiency Voltage-Conversion Efficiency RL = 1k, connected between V+ and VSH RL = 500, between VSH and VSS IL = 100mA No load 98 96 90 99.00 99.96 96 92 % % % %
Note 3. Specified min/max limits are production tested or guaranteed through correlation based on statistical control methods. Note 4. Specified output resistance is a combination of internal switch resistance and capacitor ESR.
Impala Linear Corporation
ILC6660 1.8
(408) 574-3939
www.impalalinear.com
May 2000
3
CMOS Monolithic Voltage Converter
Advance
1
V+
FC CAP+
V+ SYNC
8 7 6 5
C2
V+ (5V)
2
For a nominal fPUMP of 5kHz and C2 = 100F with an ESR of 0.05, ripple is approximately 100mV with a 100mA load current. If C2 is raised to 470F, the ripple drops to approximately 25mV. Positive Voltage Doubler The ILC6660 operates in the voltage-doubling mode as shown in the Typical Circuit. The no-load output is 2 x VIN.
+
C1
3 4
ILC6660
VSS CAPLV
N/C
VSH
+
RL
Figure 1: Test Circuit
Positive Voltage Splitter The ILC6660 operates in voltage splitting mode as shown in the Typical Circuit. The no-load output is VIN/2 Changing Oscillator Frequency Three modes control the ILC6660's clock frequency, as listed below: Oscillator Frequency 5kHz 50kHz External Clock Frequency
Detailed Description The ILC6660 capacitive charge-pump circuit either inverts, splits or doubles the input voltage (see Typical Circuits). For highest performance, low effective series resistance (ESR) capacitors should be used (see Capacitor Selection section for more details). When using the inverting mode with a supply voltage less than 2V, LV may be connected to VSS. This bypasses the internal regulator circuitry and provides best performance in lowvoltage applications. When using the inverter mode with a supply voltage above 2V, LV must be left open.
FC Open FC = V+ Open
SYNC Open Open External Clock
Applications Information
Negative Voltage Converter The most common application of the ILC6660 is as a charge-pump voltage inverter. The operating circuit uses only two external capacitors, C1 and C2 (see Typical Circuits). Even though its output is not actively regulated, the ILC6660 is very insensitive to load current changes. A typical output source resistance of 5 means that with an input of +5V the output voltage is -5V under light load, and decreases only to 4.5V with a load of 100mA. Capacitors selection Low ESR capacitors should be used at the output of ILC6660 to minimize output ripple. This can be achieved using ceramic capacitors, but may also be met with certain types of tantalum capacitors. Output ripple voltage is calculated taking into account that the output current is solely supplied from capacitor C2 during one-half of the charge-pump cycle. This introduces a peak-to-peak ripple of: V RIPPLE = I VSH 2(f PUMP)(C2) + I VSH (ESRC2) When FC and SYNC are unconnected (open), the Oscillator runs at 5kHz typically. When FC is connected to V+, the charge and discharge current change from 1.0A to 10.0A, thus increasing the Oscillator frequency 10 times. In the inverter mode, SYNC may also be overdriven by an external clock source. A square wave signal of maximum 2V peak-to-peak may be applied to SYNC via a 2...5nF capacitor to overdrive the internal oscillator. When SYNC is overdriven, FC has no effect. In some applications, the 5kHz output ripple frequency may be low enough to interfere with other circuitry. If desired, the Oscillator frequency can then be increased through use of the FC pin or an external Oscillator as described above. Increasing the clock frequency increases the ILC6660's quiescent current, but also allows smaller capacitance values to be used for C1 and C2.
Impala Linear Corporation
ILC6660 1.8
(408) 574-3939
www.impalalinear.com
May 2000
4
CMOS Monolithic Voltage Converter
Packaging Information
M Package, 8-Pin Small-Outline
0.197 0.190
Advance
Pin 1 identifier
0.155 0.150
0.244 0.228
0.069 0.053 0.060 0.040 0.019 0.013
0.012 0.009
0.8
0.011 0.004
0.050 0.016
N Package, 8-Pin Dual In-Line
0.019 0.013
0.260 0.240
0.260 0.240 0.260 0.240 0.260 0.240 0.260 0.240
0.260 0.240
0.260 0.240 0.260 0.240
Life Support Policy Impala Linear Corporation's products are not authorized for use as critical components in life support devices or systems. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
Devices sold by Impala Linear Corporation are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Impala Linear Corporation makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Impala Linear Corporation makes no warranty of merchantability or fitness for any purpose. Impala Linear Corporation reserves the right to discontinue production and change specifications and prices at any time and without notice. This product is intended for use in normal commercial applications. Applications requiring an extended temperature range, unusual environmental requirements, or high reliability applications, such as military and aerospace, are specifically not recommended without additional processing by Impala Linear Corporation. Impala Linear Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in an Impala Linear Corporation product. No other circuits, patents, licenses are implied.
Impala Linear Corporation
ILC6660 1.8
(408) 574-3939
www.impalalinear.com
May 2000
5

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