IC
ADJUSTABLE PRECISION SHUNT REGULATORS
DESCRIPTION & FEATURES
概述及特點
The FH431 series ICs are three-terminal adjustable
shunt regulators with guaranteed thermal stability over
a full operation range. These ICs feature sharp turn-on
characteristics, low temperature coefficient and low
output impedance, which make them ideal substitutes
for Zener diodes in applications such as switching
power supply, charger and other adjustable regulators.
The FH431 precision reference is offered in three band
gap tolerance: 0.5%,1.0% and 1.5％.
·
·
·
·
·
Adjustable output voltage from V
REF
to 36V
Low dynamic output resistance: 200mΩ typical
Sink current capacity from 1mA to 100 mA
Low output noise
Typical equivalent full range temperature coefficient
of 30ppm/°C
FH431
FH431
系列三端可調精密穩壓電路，具有½溫度係數和
½輸出阻抗，這樣精密可調的特性½其可替代許多應用
場合下的穩壓二極體。例如：開關電源、充電器及可調
穩壓器。FH431 參考電壓有三種精度：0.5%，1.0%和
1.5％。
·
·
·
·
·
可調電壓範圍：2.5V½36V
½動態輸出阻抗：200mΩ（典型值）
灌電流½力為
1.0½100mA
½輸出雜訊
½溫度係數：30ppm/°C（典型值）
Applications
·
·
·
·
·
應用
·
·
·
·
·
電腦主板
電壓監控器
電壓基準源
開關電源（參考電壓）
充電器
SOT-25
ANODE
Vref tolerance 5
REF
4
Vref tolerance
Week No.
SOT-89
Week No.
PC Motherboard
Voltage monitor
Voltage Reference
PWM down converter with reference
Charger
SOT-23
ANODE
3
ANODE
3
Vref tolerance
Week No.
K
1
2
CATHODE REF
(NOTE 1)
M
1
2
REF CATHODE
(NOTE 2)
W
1 2 3
NC NC CATHODE
R
1
2
3
REF ANODE CATHODE
Pin Configuration
引脚排列图
Ordering Information for 40V products
訂購資訊
Package
封裝類型
SOT-23
Temperature Range
溫度範圍
Voltage Tolerance
精度
0.5%
1.0%
1.5%
0.5%
1.0%
1.5%
0.5%
1.0%
1.5%
0.5%
1.0%
1.5%
Part Number
產品型號
FH431KT36-A
FH431KT36-B
FH431KT36-C
FH431MT36-A
FH431MT36-B
FH431MT36-C
FH431WT36-A
FH431WT36-B
FH431WT36-C
FH431RT36-A
FH431RT36-B
FH431RT36-C
Marking ID
打標
K1
K2
K3
M1
M2
M3
W1
W2
W3
R1
R2
R3
Packing Type
包裝類型
Tape
Tape
Tape
Tape
Tape
Tape
Tape
Tape
Tape
Tape
Tape
Tape
SOT-23
-40°C ~ 85°C
SOT-25
SOT-89
Note: 1. For FH431KTXX , 2. For FH431MTXX.
1
IC
ADJUSTABLE PRECISION SHUNT REGULATORS
Ordering Information for 20V products
訂購資訊
Package
封裝類型
SOT-23
Temperature Range
溫度範圍
Voltage Tolerance
精度
0.5%
1.0%
1.5%
0.5%
1.0%
1.5%
0.5%
1.0%
1.5%
0.5%
1.0%
1.5%
Part Number
產品型號
FH431KT18-A
FH431KT18-B
FH431KT18-C
FH431MT18-A
FH431MT18-B
FH431MT18-C
FH431WT18-A
FH431WT18-B
FH431WT18-C
FH431RT18-A
FH431RT18-B
FH431RT18-C
Marking ID
打標
K4
K5
K6
M4
M5
M6
W4
W5
W6
R4
R5
R6
Packing Type
包裝類型
Tape
Tape
Tape
Tape
Tape
Tape
Tape
Tape
Tape
Tape
Tape
Tape
FH431
SOT-23
-40°C ~ 85°C
SOT-25
SOT-89
Note: 1. For FH431KTXX , 2. For FH431MTXX.
FH431
Type
產品型號
X
X
X
—
X
A: 0.5%
18: 18V
B: 1.0%
C: 1.5%
36: 36V
Packing Type
包裝½式
T：Tape
編帶
B: Bulk
散裝
Package
封裝
K: SOT-23
反極性
M: SOT-23
W: SOT-25
R: SOT-89
TYPICAL APPLICATION
（典型應用）
BLOCK DIAGRAM（功½框圖）
2
IC
ADJUSTABLE PRECISION SHUNT REGULATORS
MAXIMUM RATINGS (T
a
=25
℃
)
最大額定值
Characteristic
特性參數
Cathode Voltage (Note 2)
陰極電壓
Continuous Cathode Current
陰極連續電流
Reference Input Current Range
參考端輸入電流
Power Dissipation
耗散功率
Junction Temperature
工½結溫
Thermal Impedance (Note 3)
熱阻
Storage Temperature Range
儲存溫度
Symbol
符號
V
KA
I
K
I
REF
P
D
T
J
θ
JA
T
STG
(Note 1)
FH431
Rating
額定值
Min
最小
Max
最大
FH431（40V）40
-0.3
FH431（20V）20
-100
-0.05
SOT-23-3/5L
SOT-89-3
0
SOT-23-3
SOT-23-5
SOT-89-3
-65
Unit
單½
V
mA
mA
mW
°C
150
10
370
770
150
330
250
100
150
°C / W
°C
Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.
Currents are positive into, negative out of the specified terminal.
Note 2: Voltage values are with respect to the anode terminal unless otherwise noted.
Note 3:θJA: Thermal Resistance-Junction to Ambient, D
F
= 1/θJ
A
Junction Temperature Calculation: T
J
= T
A
+ (P
D
×θJ
A
).
The
θJA
numbers are guidelines for the thermal performance of the device/PC-board system.
All of the above assume no ambient airflow.
RECOMMENDED OPERATING CONDITIONS
推薦½用條件
Operating free air temperature range
½用溫度範圍
Cathode current
陰極電流
Cathode voltage
陰極電壓
Symbol
符號
T
A
I
K
V
KA
Min
最小
0
1
0
Max
最大
70
100
FH431（40V）36
FH431（20V）18
Unit
單½
°C
mA
V
3
IC
ADJUSTABLE PRECISION SHUNT REGULATORS
ELECTRICAL CHARACTERISTICS
電特性
T
A
=25℃ unless otherwise noted
如無特殊說明，溫度為
25°C
Parameter
Symbol
Test Conditions
參數
符號
測試條件
Reference Input Voltage
輸入基準電壓
Reference Drift
參考電壓變化率
Voltage Ratio, Ref to Cathode
陰極電壓對參考電壓變化率
Reference Input Current
參考端出入電流
Minimum Operating Current
最小工½電流
Off-State Cathode Current
關斷陰極電流
Dynamic Impedance
動態阻抗
I
K
=10mA, V
KA
=V
REF
, note 1
FH431
Min.
最小值
2.487
2.475
2.462
－
－
－
－
－
－
－
－
Typ.
典型值
2.500
2.500
2.500
4
-1.4
-1.0
－
2
0.4
0.1
0.2
Max.
最大值
2.513
2.525
2.538
17
-2.7
-2.0
2.3
4
1
1
0.5
Unit
單½
V
mV
mV/V
μ
A
V
REF
I
K
=10mA, V
KA
=V
REF
, note 2
I
K
=10mA, V
KA
=V
REF
, note 3
I
K
=10mA, V
KA
=V
REF
,
0°C≤T
A
≤70°C
IK =10mA, V
KA
=2.5V to 10V
I
K
=10mA, V
KA
=10V to 36V
I
K
=10mA, V
KA
=V
REF
I
K
=10mA, V
KA
=V
REF
,
0°C≤T
A
≤70°C
∆V
REF
∆V
REF
∆
V
KA
I
REF
I
min
I
off
|Z
KA
|
V
KA
=V
REF
V
KA
= 36V,
V
REF
= 0V
V
KA
=
V
REF
,
I
K
= 1mA to 100mA, f
≤
1kHz
mA
μ
A
Ω
Note 1: For FH431A only. The output accuracy is 0.5%.
Note 2: For FH431B only. The output accuracy is 1.0%.
Note 3: For FH431C only. The output accuracy is 1.5%.
Note 4:
∆V
REF
/
∆V
KA
Ratio of change in reference input voltage to the change in cathode voltage.
PARAMETER MEASUREMENT INFORMATION
參數測試圖
4
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