TC4626/TC4627
Power CMOS Drivers With Voltage Tripler
Features:
General Description:
•
•
•
•
•
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The TC4626/TC4627 are single CMOS high-speed
drivers with an on-board voltage boost circuit. These
parts work with an input supply voltage from 4 to 6 volts.
The internal voltage booster will produce a VBOOST
potential up to 12 volts above VIN. This VBOOST is not
regulated, so its voltage is dependent on the input VDD
voltage and output drive loading requirements. An
internal undervoltage lockout circuit keeps the output in
a low state when VBOOST drops below 7.8 volts. Output
is enabled when VBOOST is above 11.3 volts.
Power Driver With On-Board Voltage Booster
Low IDD: < 4 mA
Small Package: 8-Pin PDIP
Undervoltage Circuitry
Fast Rise/Fall Time: 8.5V,
Figure 3-1
Voltage Booster
Undervoltage Threshold
Start-Up Voltage
DS20001426D-page 2
UV @VBOOST
7.0
7.8
8.5
V
VSTART
@VBOOST
10.5
11.3
12
V
IL = 10mA, VDD = 5V
RLOAD = 10 kΩ
2001-2014 Microchip Technology Inc.
TC4626/TC4627
TC4626/TC4627 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: TA = +25°C, VDD= 5V, C1 = C2 = C3 10µF unless otherwise noted.
Parameter
@VDD = 5V
Symbol
Min.
Typ.
Max.
Units
VBOOST
14.6
—
—
V
Test Conditions
No Load
Power Supply
Power Supply Current
IDD
—
—
2.5
mA
Supply Voltage
VDD
4.0
—
6.0
V
Logic 1, High Input Voltage
VIH
2.4
—
—
V
Logic 0, Low Input Voltage
VIL
—
—
0.8
V
Input Current
IIN
-10
—
1
µA
VIN = Low or High
Input
0VVINVBOOST
Output
High Output Voltage
VOH
VDRIVE – 0.025
—
—
V
Low Output Voltage
VOL
—
—
0.025
V
Output Resistance, High
RO
—
15
15
20
25
RO
—
10
10
13
15
IPK
—
1.5
—
A
Rise Time
tR
—
—
55
ns
Figure 3-1, Figure 3-2
Fall Time
tF
—
—
50
ns
Figure 3-1, Figure 3-2
Delay Time
tD1
—
—
60
ns
Figure 3-1, Figure 3-2
Delay Time
tD2
—
—
70
ns
Figure 3-1, Figure 3-2
FMAX
750
—
—
kHz
Voltage Boost Output
Source Resistance
R3
—
400
500
Ω
Voltage Doubler Output
Source Resistance
R2
—
170
300
Ω
Oscillator Frequency
FOSC
5
—
50
kHz
Oscillator Amplitude
Measured at C1-
VOSC
4.5
—
10
V
Output Resistance, Low
Peak Output Current
Ω
IOUT = 10 mA, VDD = 5V
C & E Version
(TA = +70°C or +85°C)
M Version (TA = +125°C)
Ω
IOUT = 10 mA, VDD = 5V
C & E Version
(TA = +70°C or +85°C)
M Version (TA = +125°C)
Switching Time
Maximum Switching Frequency
VDD = 5V, VBOOST > 8.5V,
Figure 3-1
Voltage Booster
UV @VBOOST
7.0
7.8
8.5
V
VSTART
@VBOOST
10.5
11.3
12
V
VBOOST
14.6
—
—
V
Power Supply Current
IDD
—
—
4
mA
Supply Voltage
VDD
4.0
—
6.0
V
Undervoltage Threshold
Start-Up Voltage
@VDD = 5V
IL = 10 mA, VDD = 5V
RLOAD = 10 kΩ
No Load
Power Supply
2001-2014 Microchip Technology Inc.
VIN = Low or High
DS20001426D-page 3
TC4626/TC4627
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No.
(8-Pin PDIP,
CERDIP)
PIN FUNCTION TABLE
Pin No.
(16-Pin SOIC Wide)
Symbol
Description
1
1
C1-
See Section 3.1 “Booster Function” for description
2
3
C1+
See Section 3.1 “Booster Function” for description
See Section 3.1 “Booster Function” for description
3
5
C2
4
8
GND
Ground.
Output
5
9
OUT
6
11
VBOOST
7
13
IN
Control Input
8
16
VDD
Supply Input
—
2, 4, 6, 7, 10, 12, 14, 15
NC
Not connected.
DS20001426D-page 4
See Section 3.1 “Booster Function” for description
2001-2014 Microchip Technology Inc.
TC4626/TC4627
3.0
APPLICATIONS INFORMATION
VBOOST
VBOOST
C3
10ȝF
0.1ȝF Ceramic
C3
10ȝF
6
Input
6
7
2
C1
10ȝF
1
3
5
C1+
Output
CL = 1000pF
7
2
C1
10ȝF
1
TC4626
C2
10ȝF
8
3
VDD = 5V
5
C1+
C2
TC4627
8
Input
VDD = 5V
4
+5V
90%
Output
CL = 1000pF
C1-
C2
10ȝF
4
+5V
0V
Input
C1-
C2
0.1ȝF Ceramic
90%
Input
10%
VBOOST
tD1
tF
tD2
0V
tR
VBOOST
90%
90%
Output
0V
tD1
90%
10%
10%
Inverting Driver Switching
2001-2014 Microchip Technology Inc.
90%
tD2
tF
tR
Output
Input: 100kHz,square wave,
tRISE = tFALL ≤ 10ns
FIGURE 3-1:
Time.
10%
10%
0V
10%
Input: 100kHz,square wave,
tRISE = tFALL ≤ 10ns
FIGURE 3-2:
Switching Time.
Noninverting Driver
DS20001426D-page 5
TC4626/TC4627
3.1
BOOSTER FUNCTION
The voltage booster is an unregulated voltage tripler
circuit. The tripler consists of three sets of internal
switches and three external capacitors. S1a and S1b
charge capacitor C1 to VDD potential. S2a and S2b add
C1 potential to VDD input to charge C2 to 2 x VDD. S3a
and S3b add C1 potential to C2 to charge C3 to 3 x
VDD. The position of the switches is controlled by the
internal four-phase clock.
6
3 x VDD, VBOOST
6
+
C3
S3a
2 x VDD
3
+
S2a
C2
(4 to 6V)
VDD
S3b
8
S1a
S2b
2
+
C1
1
S1b
GND
4
FIGURE 3-3:
DS20001426D-page 6
Voltage Booster.
2001-2014 Microchip Technology Inc.
TC4626/TC4627
Pin 1 CPF 2 Waveforms
3 x VDD
2 x VDD
Pin 2
Voltage
VDD
2 x VDD
Pin 1
Voltage
VDD
0
On
S1
Off
S2
On
Off
S3
On
Off
FIGURE 3-4:
Position of Switches.
2001-2014 Microchip Technology Inc.
DS20001426D-page 7
TC4626/TC4627
4.0
TYPICAL CHARACTERISTICS
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note:
TC4626 VOH vs. Frequency
TC4626 VOH vs. Frequency
16
VS = 5V
TA = -55°C
470pF
14
14
12
VOUT HI (Volts)
VOUT HI (Volts)
12
10
2200pF
8
1000pF
6
10
8
6
2200pF
4
4
2
2
0
10
500 1,000 1,500 2,000 2,500 3,000 3,500
FREQUENCY (kHz)
500 1,000 1,500 2,000 2,500 3,000 3,500
FREQUENCY (kHz)
Delay Time vs. Temperature
TC4626 VOH vs. Frequency
100
14
VS = 5V
TA = 125°C
12
10
80
470pF
Time (nsec)
VOUT HI (Volts)
1000pF
0
5
8
6
2200 pF
1000pF
Input = 0-5V;
TR& TF
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