TK72120CS [TOKO]
Fixed Negative Standard Regulator, 2V, PDSO5, SOT-23, 5 PIN;
| 型号： | TK72120CS |
| 厂家： | 
TOKO, INC |
| 描述： | Fixed Negative Standard Regulator, 2V, PDSO5, SOT-23, 5 PIN 光电二极管 输出元件 调节器 |
| 文件： | 总28页 (文件大小：660K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
APPLICATION MANUAL
Negative-input Negative-output Regulator IC
TK721xxCS
CONTENTS
1 . DESCRIPTION
2 . FEATURES
2
2
2
3 . APPLICATIONS
4 . PIN CONFIGURATION
5 . PACKAGE OUTLINE
5. ORDERING INFORMATION
6 . BLOCK DIAGRAM
2
2
3
4
7 . ABSOLUTE MAXIMUM RATINGS
8 . ELECTRICAL CHARACTERISTICS
9 . TEST CIRCUIT
4
5
6
10 . TYPICAL CHARACTERISTICS
11 . PIN DESCRIPTION
12 . APPLICATIONS INFORMATION
12-2. ESR Stability
7
22
23
24
25
25
27
28
28
12-3.
Operating Region and Power Dissipation
12-4 Application hint
13 . NOTES
14. OFFICES
GC3-K020B
Page 1
TK721xxCS
Negative-input Negative-output Regulator IC
TK721xxCS
1. DESCRIPTION
4. PIN CONFIGURATION
TK721xxCS series is a negative-input negative-output
regulator IC using silicon monolithic bipolar structure
which can supply 150mA output current.
Top View
The output voltage can be set from -2.0 to -9.5V, which is
trimmed in high accuracy.
1
2
3
Cont
Vout
5
4
TK721xxCS is supplied with ON/OFF terminal and noise
reduction terminal. The ON/OFF control can be
controlled directly with positive logic or CPU.
Moreover, TK721xxCS is provided with short-circuit
protection and thermal shutdown.
VEE
Np
GND
2. FEATURES
! High Output Voltage Accuracy(±2.0% or ±60 mV)
! ON/OFF control available (High OFF)
5. PACKAGE OUTLINE
! SOT23-5
! Built-in short-circuit protection and thermal shutdown.
! Guarantee 150mA output current(200mA peak)
! Ceramic capacitor available for application
Mark
0.7
5
4
3. APPLICATIONS
! Battery Powered Systems
! DSC, CCD bias, GaAs bias.
3
1
0.95
0.95
0.4+0.10
−0.05
0.95
0.95
Reference Mount Pad
M
0.1
±0.2
2.9
±0.2
2.8
0.1
GC3-K020B
Page 2
TK721xxCS
5. ORDERING INFORMATION
Package
Vout
Part Number
TK72120CS
TK72125CS
TK72130CS
TK72135CS
TK72140CS
TK72145CS
TK72150CS
TK72155CS
TK72160CS
TK72165CS
TK72170CS
TK72175CS
TK72180CS
TK72185CS
TK72190CS
TK72195CS
Marking
K20
K25
K30
K35
K40
K45
K50
K55
K60
K65
K70
K75
K80
K85
K90
K95
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
-5.5
-6.0
-6.5
-7.0
-7.5
-8.0
-8.5
-9.0
-9.5
SOT23-5
For other voltages, please contact the TOKO sales office.
GC3-K020B
Page 3
TK721xxCS
6. BLOCK DIAGRAM
90k
Cont
VEE
Vout
Bandgap
Reference
Over Heat
&
Over Current
Protection
Np
GND
Control:Low Level On
7. ABSOLUTE MAXIMUM RATINGS
Ta=25°C
Parameter
Symbol
Vin
Rating
-20
Units
V
Conditions
Supply Voltage
|Vin|+|Vcont|≤20V
|Vin|+|Vcont|≤19V
Control pin Voltage
Power Dissipation
Vcont
-0.4 ~ +5
V
PD must be decreased at the rate of 4mW/°C
for operation above 25°C.
mW
(SOT23-5 Simple substance)
PD
500
Storage Temperature Range
Operating Temperature Range
Operating Voltage Range
Output short-circuit current
Tstg
TOP
VOP
-55 ~ +150
-40 ~ 85
-19
°C
°C
V
|Vin|+|Vcont|≤19V
Over Current Protection
Ishort
300
mA
Absolute maximum ratings are limits beyond which damage to the device may occur.
When the operation exceeds this standard, quality can not be guaranteed.
GC3-K020B
Page 4
TK721xxCS
8. ELECTRICAL CHARACTERISTICS
Vin=VoutTYP-1.5V, Ta=25°C
Value
TYP
Parameter
Symbol
Unit
Condition
MIN
MAX
Vout
Vout
LinReg
Refer to TABLE 1
V
mV
mV
mV
mV
V
Iout=5mA
∆Vin=5V
Line Regulation
1
5
Refer to TABLE 1
Iout=5mA~50mA
Iout=5mA~100mA
Iout=5mA~150mA
Iout=50mA
Load Regulation
LoaReg
Refer to TABLE 1
Refer to TABLE 1
0.29
0.48
0.66
155
20
0.50
0.80
1.10
250
60
Dropout Voltage *1
Vdrop
V
Iout=100mA
V
Iout=150mA
Supply Current
Standby Current
Icc
µA
µA
mA
µA
V
Iout=0mA
Istandby
Vout Off State
When Vout drops 10%
Vcont=+1.8V
Vout ON State
Vout OFF State
Peak Output Current IoutPEAK
200
280
12
Control Current
Control Voltage
Icont
30
0.3
0
Vcont
1.5
V
*1 For Vout≥-3.0 no regulations
TABLE 1
Vout
Iout=50mA
Iout=150mA
Part Number
MIN
TYP
MAX
-1.940
-2.440
-2.940
-3.430
-3.920
-4.410
-4.900
-5.390
-5.880
-6.370
-6.860
-7.350
-7.840
-8.330
-8.820
-9.310
TYP
9
MAX
TYP
24
24
24
28
32
36
40
44
48
52
56
60
64
68
72
76
MAX
60
TK72120CS
TK72125CS
TK72130CS
TK72135CS
TK72140CS
TK72145CS
TK72150CS
TK72155CS
TK72160CS
TK72165CS
TK72170CS
TK72175CS
TK72180CS
TK72185CS
TK72190CS
TK72195CS
-2.060
-2.560
-3.060
-3.570
-4.080
-4.590
-5.100
-5.610
-6.120
-6.630
-7.140
-7.650
-8.160
-8.670
-9.180
-9.690
-2.000
-2.500
-3.000
-3.500
-4.000
-4.500
-5.000
-5.500
-6.000
-6.500
-7.000
-7.500
-8.000
-8.500
-9.000
-9.500
24
24
24
28
30
34
38
41
45
49
53
56
60
64
68
71
9
60
9
60
11
12
14
15
17
18
20
21
23
24
26
27
29
70
80
90
100
110
120
130
140
150
160
170
180
190
GC3-K020B
Page 5
TK721xxCS
9. TEST CIRCUIT
! DC
! Load Transient
1
Cont
VEE
Np
Vout
GND
5
4
1
2
3
Cont
Vout
GND
5
4
Icont
Vout
Cout
Iout
A
V
2
3
Vout
Cout
Iout
Cin
Vin
µ
1 Ｆ
V
VEE
Np
Cin
Vin
1µＦ
Vcont
A
Cnp
0.01
Iin
µ
Ｆ
Cnp
! Line Transient
! ON/OFF Transient
1
Cont
Vout
5
4
Vcont=0→1.5→0
1
2
3
Cont
VEE
Np
Vout
GND
5
4
Vin=Vouttyp-1.5V
↓
V
2
VEE
Np
Vout
Cout
Iout
Cin
Vin
Vout
Cout
Iout
V
Vin
Cin
3
GND
↑
Vin=Vouttyp-2.5V
Cnp
Cnp
! Ripple Rejection
! ESR Stability
View point
1
2
3
Cont
Vout
GND
5
1
2
3
Cont
Vout
GND
5
4
Vripple=500mVp-p
Vin=Vouttyp-2.0V
Vout
ESR
Iout
V
VEE
Np
VEE
Np
Cin
Vin
Cout
Iout
Cout
4
Cnp
Cnp
GC3-K020B
Page 6
TK721xxCS
10. TYPICAL CHARACTERISTICS
10-1 DC CHARACTERISTICS
Unless otherwise specified Vin=VoutTYP-1.5V,Vcont=0V,Cin=1.0uF(MLCC),Cout=1.0uF(MLCC),Cnp=0.01uF
Ta=25°C
1
2
3
Cont
VEE
Np
Vout
GND
5
4
Icont
Vout
Cout
Iout
A
V
Cin
Vin
1µＦ
1 Ｆ
µ
Vcont
A
Cnp
0.01
Iin
µＦ
! Line Regulation
! Load Regulation
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0
100
90
80
70
60
50
40
30
20
10
0
Vout=-8.5V
Vout=-5.0V
Vout=-8.5/-5.0/-2.5V
Vout=-2.5V
5
10
15
20
0
50
100
150
Vin (-V)
Iout (mA)
! IoutPEAK
! IQ
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Vout=-8.5V
Vout=-5.0V
Vout=-2.5V
0
100
200
Iout (mA)
300
400
0
100
200
300
400
Iout (mA)
GC3-K020B
Page 7
TK721xxCS
Unless otherwise specified Vin=VoutTYP-1.5V,Vcont=0V,Cin=1.0uF(MLCC),Cout=1.0uF(MLCC),Cnp=0.01uF
Ta=25°C
! Iin (Iout=0mA)
! Dropout Voltage
2000
1800
1600
1400
1200
1000
800
600
400
200
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
Vout=-8.5V
Vout=-5.0V
Vout=-2.5V
0
5
10
15
20
50
100
Iout (mA)
150
Vin (-V)
! Vout VS Vcont
! Vout VS VIN
10.0
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Vout=-8.5V
Iout=0/30/60/90/120/150mA
Vout=-5.0V
Vout=-2.5V
0.0
0.5
1.0
1.5
2.0
-0.5
0
0.5
ΔVIN (-V)
1
Vcont (V)
! Icont VS Vcont (Iout=1mA)
! Icc Off Mode (Vcont=1.5V,Iout=0mA)
100
90
80
70
60
50
40
30
20
10
0
50
40
30
20
10
0
-10
-20
-30
-40
-50
-1.0 0.0 1.0 2.0 3.0 4.0 5.0
Vcont (V)
0
5
10
15
20
Vin (-V)
GC3-K020B
Page 8
TK721xxCS
10-2 Temperature characteristic
Unless otherwise specified Vin=-VoutTYP-1.5V,Vcont=0V,Cin=1.0uF(MLCC),Cout=1.0uF(MLCC),Cnp=0.01uF
1
2
3
Cont
VEE
Np
Vout
5
Icont
Vout
Cout
Iout
A
V
Cin
Vin
1µＦ
1 Ｆ
µ
GND
4
Vcont
A
Cnp
0.01
Iin
µＦ
! TK72125CS Vout
! TK72185CS Vout
2.500
8.550
2.480
2.460
2.440
2.420
8.530
8.510
8.490
8.470
2.400
8.450
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
Ta (℃)
Ta (℃)
! TK72125CS IoutPEAK
! TK72185CS IoutPEAK
350
340
330
320
310
300
290
280
270
260
250
350
340
330
320
310
300
290
280
270
260
250
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
Ta (℃)
Ta (℃)
GC3-K020B
Page 9
TK721xxCS
Unless otherwise specified Vin=-VoutTYP-1.5V,Vcont=0V,Cin=1.0uF(MLCC),Cout=1.0uF(MLCC),Cnp=0.01uF
! TK72125CS LoadReg
! TK72185CS LoadReg
160
140
120
160
140
120
100
80
Io=5-150mA
Io=5-150mA
100
80
60
40
20
0
Io=5-100mA
60
40
Io=5-100mA
20
0
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
Ta (℃)
Ta (℃)
! TK72125CS ON/OFF
! TK72185CS ON/OFF
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
Vout Off
Vout Off
Vout On
Vout On
0.7
0.6
0.5
0.7
0.6
0.5
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
Ta (℃)
Ta (℃)
! TK72125CS Iin(Iout=0mA)
! TK72185CS Iin(Iout=0mA)
200
190
180
170
160
150
140
130
120
110
100
200
190
180
170
160
150
140
130
120
110
100
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
Ta (℃)
Ta (℃)
GC3-K020B
Page 10
TK721xxCS
Unless otherwise specified Vin=-VoutTYP-1.5V,Vcont=0V,Cin=1.0uF(MLCC),Cout=1.0uF(MLCC),Cnp=0.01uF
! TK72125CS Icont
! TK72185CS Icont
20
20
18
18
16
16
14
14
12
12
10
10
8
8
6
6
4
4
2
2
0
0
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
Ta (℃)
Ta (℃)
! TK72125CS Icc_OFFMode
! TK72185CS Icc_OFFMode
50
45
40
35
30
25
20
15
10
5
50
45
40
35
30
25
20
15
10
5
0
0
-40 -20
0
20 40 60 80 100
-40 -20
0
20 40 60 80 100
Ta (℃)
Ta (℃)
! TK72125CS Vdrop
! TK72185CS Vdrop
900
800
700
600
500
400
300
200
100
For Vout≥-2.0V, no regulations
Io=50/100/150mA
0
-40 -20
0
20 40 60 80 100
Ta (℃)
GC3-K020B
Page 11
TK721xxCS
10-3 Load Transient
Unless otherwise specified Vin=VoutTYP-1.5V,Cin=1.0uF(MLCC),Cnp=0.01uF
1
2
3
Cont
VEE
Np
Vout
GND
5
4
Vout
Cout
Iout
V
Cin
Vin
Cnp
!TK72125CS
!TK72185CS
Vout:200mV/div Time:200usec/div
Vout:200mV/div Time:200usec/div
Cout=1.0uF(MLCC)
Cout=1.0uF(MLCC)
Vout
Iout
Vout
Iout
Cout=2.2uF(MLCC)
5mA
Cout=2.2uF(MLCC)
100mA
5mA
100mA
!TK72125CS
!TK72185CS
Vout:200mV/div Time:200usec/div
Vout:200mV/div Time:200usec/div
Cout=1.0uF(Tantalum)
Cout=2.2uF(Tantalum)
Cout=1.0uF(Tantalum)
Vout
Iout
Vout
Iout
Cout=2.2uF(Tantalum)
5mA
5mA
100mA
100mA
GC3-K020B
Page 12
TK721xxCS
Unless otherwise specified Vin=VoutTYP-1.5V,Cin=1.0uF(MLCC),Cnp=0.01uF
!TK72125CS !TK72185CS
Vout:1V/div Time:10usec/div Vout:2V/div Time:10usec/div
Cout=1.0uF(MLCC)
Cout=2.2uF(MLCC)
Cout=1.0uF(MLCC)
Cout=2.2uF(MLCC)
Vout
Iout
Vout
Iout
0mA
0mA
100mA
100mA
!TK72125CS
!TK72185CS
Vout:500mV/div Time:4msec/div
Vout:500mV/div Time:4msec/div
Vout
Vout
Cout=2.2uF(MLCC)
Cout=1.0uF(MLCC)
Cout=2.2uF(MLCC)
Cout=1.0uF(MLCC)
Cout=0.1uF(MLCC)
0mA
Cout=0.1uF(MLCC)
0mA
Iout
100mA
Iout
100mA
GC3-K020B
Page 13
TK721xxCS
Unless otherwise specified Vin=VoutTYP-1.5V,Cin=1.0uF(MLCC),Cnp=0.01uF
!TK72125CS !TK72185CS
Vout:500mV/div Time:10usec/div Vout:500mV/div Time:10usec/div
Cout=1.0uF(Tantalum)
Cout=2.2uF(Tantalum)
Cout=1.0uF(Tantalum)
Vout
Vout
Cout=2.2uF(Tantalum)
100mA
0mA
0mA
Iout
Iout
100mA
!TK72125CS
!TK72185CS
Vout:100mV/div Time:4msec/div
Vout:100mV/div Time:4msec/div
Cout=2.2uF(Tantalum)
Cout=2.2uF(Tantalum)
Vout
Vout
Cout=1.0uF(Tantalum)
0mA
Cout=1.0uF(Tantalum)
0mA
Iout
100mA
Iout
100mA
GC3-K020B
Page 14
TK721xxCS
10-4 ON/OFF Transient
Vin=VoutTYP-1.5V,Cin=1.0uF(MLCC),Iout=100mA
1
Cont
VEE
Np
Vout
GND
5
4
Vcont=0→1.5→0
V
2
Cin
Vin
Vout
Cout
Iout
3
Cnp
!TK72125CS Cout=1.0uF(MLCC)
!TK72185CS Cout=1.0uF(MLCC)
Vout:2V/div Vcont:2V/div Time:200usec/div
Vout:1V/div Vcont:2V/div Time:400usec/div
←0V
←0V
Vout
Vout
Cnp=103
Cnp=103
Cnp=102
Cnp=102
Vcont
f=1Hz(Cnp Full discharge)
f=1Hz(Cnp Full discharge)
Vcont
!TK72125CS Cout=1.0uF(MLCC)
!TK72185CS Cout=1.0uF(MLCC)
Vout:1V/div Vcont:2V/div Time:4msec/div
Vout:2V/div Vcont:2V/div Time:2msec/div
←0V
←0V
Vout
Vout
Cnp=104
Cnp=473
Cnp=104
Cnp=473
Vcont
Vcont
f=1Hz(Cnp Full discharge)
f=1Hz(Cnp Full discharge)
GC3-K020B
Page 15
TK721xxCS
Vin=-VoutTYP-1.5V,Cin=1.0uF(MLCC),Iout=100mA
!TK72125CS
!TK72185CS
Vout:2V/div Vcont:2V/div Time:400usec/div
Vout:1V/div Vcont:2V/div Time:400usec/div
Vout
←0V
Vout
←0V
Cout=1uF/10uF/22uF
Cout=1uF/10uF/22uF
Cnp=103
Cnp=103
CoutType=MLCC
CoutType=MLCC
Vcont
Vcont
f=1Hz(Cnp Full discharge)
f=1Hz(Cnp Full discharge)
!TK72125CS
!TK72185CS
Control frequency variable
Vout:2V/div Vcont:2V/div Time:400usec/div
Control frequency variable
Vout:1V/div Vcont:2V/div Time:200usec/div
Vout
Vout
←0V
←0V
f=100/50/1Hz
f=100/50/1Hz
Cnp=103
Cnp=103
Cout=1.0uF(MLCC)
Cout=1.0uF(MLCC)
Vout OFF
Vout OFF
Vcont
Vcont
Vout ON
Vout ON
Rise-time of the output voltage. changes by Cout and Cnp.
Moreover, the rise-time changes by the charge situation of Cnp. Standing up from the state that the charge came off
completely slows most.
GC3-K020B
Page 16
TK721xxCS
Vin=-VoutTYP-1.5V,Cin=1.0uF(MLCC),Cout=1.0uF(MLCC),Cnp=0.01uF,Iout=100mA
!TK72125CS !TK72185CS
Vout:2V/div Vcont:1V/div Time:100usec/div Vout:2V/div Vcont:1 V/div Time:400usec/div
Vout
Vout
0V→
0V→
Iout=10/50/100mA
Iout=10/50/100mA
OFF
OFF
Vcont
Vcont
ON
ON
!TK72125CS
!TK72185CS
Vout:2V/div Vcont:1V/div Time:100usec/div
Vout:2V/div Vcont:1V/div Time:1msec/div
Vout
Vout
0V→
0V→
Cout=1.0/4.7/10uF
Cout=1.0/4.7/10uF
OFF
OFF
Vcont
Vcont
ON
ON
The turn on time will be largely affected by Iout and Cout,but not by Cnp.
GC3-K020B
Page 17
TK721xxCS
10-5 Line Transient
Vin=-VoutTYP-1.5→-VoutTYP-2.5V,Cin=1.0uF(MLCC),Cnp=0.01uF,Iout=100mA
1
2
3
Cont
VEE
Np
Vout
GND
5
4
Vin=Vouttyp-1.5V
↓
Vout
Cout
Iout
V
Vin
Cin
↑
Vin=Vouttyp-2.5V
Cnp
!TK72125CS
!TK72185CS
Vout:100mV/div Vin:1V/div Time:100usec/div
Vout:100mV/div Vin:1V/div Time:100usec/div
Vout
Vout
Vin=VoutTYP-2.5V
Vin=VoutTYP-2.5V
VoutTYP-1.5V
VoutTYP-1.5V
Vin
Vin
!TK72125CS
!TK72185CS
Vout:100mV/div Vin:1V/div Time:100usec/div
Vout:100mV/div Vin:1V/div Time:100usec/div
Vout
Vout
VoutTYP-1.5V
VoutTYP-1.5V
Vin
Vin
Vin=VoutTYP-2.5V
Vin=VoutTYP-2.5V
GC3-K020B
Page 18
TK721xxCS
10-6 Noise
Vin= VoutTYP-1.5(V) Vcont=0V Cin=1.0uF(MLCC)
BPF400 ~ 80kHz Iout=100mA
! Cout=1.0uF(MLCC)
! Cout=1.0uF(Tantalum)
500
450
400
500
450
400
TK72185CS
TK72185CS
350
300
350
300
250
200
150
100
50
250
TK72125CS
TK72125CS
200
150
100
50
0
0
1000
10000
100000
1000
10000
100000
Cnp (pF)
Cnp (pF)
! Cout=1.0uF(MLCC) Cnp=103
! Cout=1.0uF(MLCC) Cnp=103 Iout=100mA
200
180
160
140
120
100
80
60
40
20
0
200
180
160
140
120
100
80
60
40
20
0
TK72185CS
TK72125CS
0
50
100
150
2
4
6
8
10
Iout (mA)
Vout (-V)
GC3-K020B
Page 19
TK721xxCS
10-7 Ripple Rejection
Vin=VoutTYP-2.0(V) Vripple=500mVp-p,Cnp=0.01uF,Iout=10mA
View point
1
2
3
Cont
VEE
Np
Vout
GND
5
Vripple=500mVp-p
Cout
Iout
4
Vin=Vouttyp-2.0V
Cnp
!TK72125CS Cout=1.0uF(MLCC)
!TK72185CS Cout=1.0uF(MLCC)
0dB→
0dB→
10dB/div
10dB/div
!TK72125CS Cout=2.2uF(MLCC)
0dB→
!TK72185CS Cout=2.2uF(MLCC)
0dB→
10dB/div
10dB/div
GC3-K020B
Page 20
TK721xxCS
Vin=VoutTYP-2.0(V) Vripple=500mVp-p,Cnp=0.01uF,Iout=10mA
!TK72125CS Cout=1.0uF(Tantalum)
!TK72185CS Cout=1.0uF(Tantalum)
0dB→
0dB→
10dB/div
10dB/div
!TK721xxCS f=1kHz,Vripple=100mVp-p
0
Io=10mA
-10
-20
Io=100mA
-30
-40
-50
-60
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Vout-Vin (V)
GC3-K020B
Page 21
TK721xxCS
11. PIN DESCRIPTION
Pin
Pin No
Internal Equivalent Circuit
Description
Description
1
Cont
52k
ON/OFF control terminal
1
2
3
4
Cont
VEE
Np
Please do not apply -0.4V or less to this pin.
The current might flow from GND.
38k
GND
-
Input terminal
3
Np
GND
500k
Noise pass terminal
GND terminal
27k
Vref
10k
GND
-
GND
R1
R2
Output terminal
R1+ R2
Vout = Vref ×
R1
5
Vout
Vout
6
Vref
VEE
GC3-K020B
Page 22
TK721xxCS
12. APPLICATIONS INFORMATION
12-1.Definition of term
Relating Protection Circuit
*Over Current Protection
Relating Characteristic
It is a function to protect the IC by limiting the output
current when excessive current flows to IC, such as the
output is connected to GND, etc.
note Each characteristics will be measured in a short
period not to be influenced by joint temperature (Tj).
*Output voltage (Vout)
The output voltage is specified with Vin= VoutTYP+1V
*Thermal Protection
It protects the IC not to exceed the permissible power
consumption of the package in case of large power loss
inside the regulator.
and Iout=5mA
*Output current (Iout)
The output is turned off when the chip reaches around
150°C, but it turns on again when the temperature of the
chip decreases.
Output current, which can be used continuously (It is
the range where overheating protection of the IC does not
operate.)
*Peak output current (IoutPEAK
)
The rated output current is specified under the
condition where the output voltage drops 90% by
increasing the output current, compared to the value
specified at Vin=VoutTYP-1.5V.
*ESD
It is tested by connecting charged capacitor to GND
pin and Vin pin.
MM 200pF 0Ω 200Vmin
HBM 100pF 1.5kΩ 2000Vmin
*Dropout voltage (Vdrop)
It is an I/O voltage difference when the circuit stops
the stable operation by decreasing the input voltage.
It is measured when the output voltage drops 100mV
from its nominal value by decreasing the input voltage
gradually.
*Line Regulation (LinReg)
It is the fluctuations of the output voltage value when
the input voltage is changed.
*Load Regulation (LoaReg)
It is the fluctuations of output voltage value when the
input voltage is assumed to be VoutTYP -1.5V, and the
load current is changed.
*Ripple Rejection (R.R)
Ripple rejection is the ability of the regulator to
attenuate the ripple content of the input voltage at the
output. It is measured with the condition of
Vin=Vout-2.0V. Ripple rejection is the ratio of the ripple
content between the output vs. input and is expressed in
dB
*Standby current (Istandby)
It is an input current which flows to the control terminal,
when the IC is turned off.
GC3-K020B
Page 23
TK721xxCS
*The output can be seen as oscillated when the
overheating protection or the overcurrent protection start
operation, or the input voltage is low. In this case, please
lower the power consumption, decrease the load current
or make the input voltage higher.
12-2. ESR Stability
IC does operates with 1.0uF Cout. If it is 1.0uF or larger,
the capacitor of any type can be used in all range without
considering ESR. But due to the parts are uneven, please
enlarge the capacitance as much as possible. With larger
capacity, the output noise decreases more. In addition, the
response to the load change, etc. can be improved. The IC
won’t be damaged by enlarging the capacity.
Selection of Cout
Generally, a ceramic capacitor has the temperature
characteristic and the voltage characteristic. Please select
parts in consideration of the voltage and the temperature
used. TOKO recommend B characteristic type.
The input capacitor is necessary in case the battery
voltage drops, the power supply impedance increases, or
the distance to the power supply is far. 1 input capacitor
might be necessary for each 1 IC or for several ICs. It
depends on circuit condition. Please confirm the stability
by each circuit.
Generally, Multi layer ceramic capacitor (MLCC) has the
temperature characteristic and the voltage characteristic.
Please select parts in consideration of the voltage and the
temperature used.
Stability area graph (Vout=-2.0 ~ -9.5V)
Condition:Vin=VoutTYP-1.5V Cin=0.1µF(MLCC)
Cout=1.0uF
100
Unstable area
10
1
0.1
Stable area
0.01
0
50
100
Iout (mA)
150
GC3-K020B
Page 24
TK721xxCS
12-3.
Operating Region and Power Dissipation
The power dissipation of the device is dependent on the
junction temperature. Therefore, the package dissipation
is assumed to be an internal limitation. The package itself
does not have enough heat radiation characteristic due to
the small size. Heat runs away by mounting IC on PCB.
This value changes by the material, copper pattern etc. of
PCB.
Method of obtaining Pd easily
Connect output terminal to GND(short circuited), and
measure the input current by increasing the input voltage
gradually up to 10V. The input current will reach the
maximum output current, but will decrease soon
according to the chip temperature rising, and will finally
enter the state of thermal equilibrium (natural air cooling)
The input current and the input voltage of this state will
be used to calculate the Pd.
The overheating protection operates when there is a lot of
loss inside the regulator (Ambient temperature high, heat
radiation bad, etc.). The output current and the output
voltage will drop when the protection circuit operates.
When joint temperature (Tj) reaches the set temperature,
IC stops the operation. However, operation begins at once
when joint temperature(Tj) decrease.
Pd(mW) Vin (V) × Iin (mA)
When the device is mounted, mostly achieve 600mW or
more.
The thermal resistance when mounted on PCB
The chip joint temperature during operation is shown by
Tj=θja×Pd+Ta. Joint part temperature (Tj) of
TK721xxCS is limited around 150°C with the
overheating protection circuit. Pd is the value when the
overheating protection circuit starts operation.
Pd(mW)
2
Pd
When you assume the ambient temperature to be 25°C,
150=θja×Pd(W)+25
D Pd
5
θja×Pd=125
3
θja=125/Pd (°C /W)
4
0
25
50
75
Ta (℃)
100
150
Example of mounting substrate
Procedure (When mounted on PCB).
1.Find Pd (Vin×Iin when the output is short-circuited).
2. Plot Pd against 25°C.
3. Connect Pd to the point corresponding to the 150°C with a
straight line.
4. Pull a vertical line from the maximum operating temperature in
your design (e.g., 75°C).
5. Read the value of Pd against the point at which the vertical line
intersects the derating curve(DPd).
6. DPd ÷ (Vinmax−Vout)=Iout (at 75°C)
PCB Material: Two layer glass epoxy substrate
(x=30mm,y=30mm,t=1.0mm,Copper pattern thickness
35um)
The maximum output current at the highest operating
temperature will be Iout DPd ÷ (VinMax−Vout).
Please use the device at low temperature with better
radiation. The lower temperature provides better quality.
Please do derating with 5.9mW/°C at Pd=736mW and
25°C or higher. Thermal resistance is (θja=170°C /W)
GC3-K020B
Page 25
TK721xxCS
The operation area
graph1
Pd
(mW)
1000
ONPCB5.9mW
800
600
400
200
PCB Material : Two layer glass epoxy substrate
(x=30mm,y=30mm,t=1.0mm,Copper pattern thickness
35um)
Unit-4.0mW
Pd when mounted on the substrate mentioned above
(Ta=25°C)
0
25
50
85
125
150
Ta (°C)
SOT23-5=736mW (derating –5.9mW)
The current which can be used continuously with
Ta=25°C min is calculated by the following.
736 − 5.9× (Ta − 25)
graph2
IoutMAX vs IN-OUT VOLTAGE DIFF
(SOT23-5)
Iout(mA) =
- SOT23-5
Vin − Vout
160
Ta=+25℃
*Iout<150mA
140
120
100
80
The operation area is the part enclosed in the line
including the “0” mentioned in graph1
The overheating sensor may operate, or the output
voltage may drop outside those area.
Ta=+85℃
The heat radiation characteristic changes in various
conditions, so please check under your condition.
Ta=+70℃
Ta=+50℃
60
40
20
0
0 1 2 3 4 5 6 7 8 9 10
IN-OUT VOLTAGE DIFF (V)
GC3-K020B
Page 26
TK721xxCS
12-4 Application hint
*When using together with Positive output regulator
Vout
Positive REG
Load
TK721xxC
Negative REG
Vout
When using positive output regulator together with this
device, sometimes the voltage may not be outputted. To
solve this problem, please connect Schottkey diode
between GND and output, or change the timing of On/Off.
*When not using ON/OFF function
Please connect the Cont terminal to GND.
*Notes when evaluating with output terminal is
connected to GND(short-circuit)
The output terminal becomes plus potential by the
resonance of Cout (C element) connected to output and
the short-circuit line (L element). When the output
terminal becomes positive, parasitism Tr is caused inside
the IC. The latch-up phenomenon occurs and in the worst
case, IC may be damaged.(f0=1 / 2π√(L C))
This resonance appears remarkably when using a ceramic
capacitor with small ESR, etc. This can be solved by
connecting 2Ω resistance in series. As a result, the
latch-up phenomenon in IC can be prevented.
Generally, tantalum capacitor has enough ESR value and
the influence of the resonance decreases.
GC3-K020B
Page 27
TK721xxCS
13. NOTES
14. OFFICES
! Please be sure that you carefully discuss your planned
purchase with our office if you intend to use the products in
this application manual under conditions where particularly
extreme standards of reliability are required, or if you intend
to use products for applications other than those listed in this
application manual.
If you need more information on this product and other
TOKO products, please contact us.
! TOKO Inc. Headquarters
1-17, Higashi-yukigaya 2-chome, Ohta-ku, Tokyo,
145-8585, Japan
" Power drive products for automobile, ship or aircraft
transport systems; steering and navigation systems,
emergency signal communications systems, and any
system other than those mentioned above which include
electronic sensors, measuring, or display devices, and
which could cause major damage to life, limb or property
if misused or failure to function.
TEL: +81.3.3727.1161
FAX: +81.3.3727.1176 or +81.3.3727.1169
Web site: http://www.toko.co.jp/
! TOKO America
Web site: http://www.toko.com/
" Medical devices for measuring blood pressure, pulse,
etc., treatment units such as coronary pacemakers and heat
treatment units, and devices such as artificial organs and
artificial limb systems which augment physiological
functions.
! TOKO Europe
Web site: http://www.tokoeurope.com/
! TOKO Hong Kong
Web site: http://www.toko.com.hk/
" Electrical instruments, equipment or systems used in
disaster or crime prevention.
! TOKO Taiwan
Web site: http://www.tokohc.com.tw/
! Semiconductors, by nature, may fail or malfunction in
spite of our devotion to improve product quality and
reliability. We urge you to take every possible precaution
against physical injuries, fire or other damages which may
cause failure of our semiconductor products by taking
appropriate measures, including a reasonable safety margin,
malfunction preventive practices and fire-proofing when
designing your products.
! TOKO Singapore
Web site: http://www.toko.com.sg/
! TOKO Seoul
Web site: http://www.toko.co.kr/
! TOKO Manila
Web site: http://www.toko.com.ph/
! This application manual is effective from Dec. 2004 .
Note that the contents are subject to change or
discontinuation without notice. When placing orders, please
confirm specifications and delivery condition in writing.
! TOKO Brazil
Web site: http://www.toko.com.br/
! TOKO is not responsible for any problems nor for any
infringement of third party patents or any other intellectual
property rights that may arise from the use or method of use
of the products listed in this application manual. Moreover,
this application manual does not signify that TOKO agrees
implicitly or explicitly to license any patent rights or other
intellectual property rights which it holds.
! None of the ozone depleting substances(ODS) under the
Semiconductor Division
Montreal Protocol are used in our manufacturing process.
YOUR DISTRIBUTOR
GC3-K020B
Page 28
相关型号：
©2020 ICPDF网 联系我们和版权申明