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參數(shù)資料
| 型號： | UCC284SDR-12EP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 固定負電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 12 V FIXED NEGATIVE LDO REGULATOR, 0.5 V DROPOUT, PDSO8 |
| 封裝： | PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 17/21頁 |
| 文件大小： | 506K |
| 代理商： | UCC284SDR-12EP |
PIN DESCRIPTION
www.ti.com ....................................................................................................................................... SLVS862A – NOVEMBER 2008 – REVISED NOVEMBER 2008
ELECTRICAL CHARACTERISTICS (continued)
TA = –55°C to 100°C for the UCC284, VIN = VOUT – 1.5 V, IOUT = 0 mA, COUT = 4.7 F, and CT = 0.015 F. For
UCC284-ADJ, VOUT is set to –3.3 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
IOUT 0.5 A, VOUT = –3.15 V
0.25
0.5
V
Dropout voltage, VOUT - VIN
IOUT 50 mA, VOUT = –3.15 V
25
50
mV
Sense pin input current
100
250
nA
UCC284-ADJ Adjustable 0.5-A Power Supply Section
Input voltage range
–15
–3.5
V
Undervoltage lockout
–3.2
–2.95
–2.7
V
Quiescent current charge pump on
VIN = –3.15 V(2)
200
350
A
Quiescent current
VIN = –15 V
200
250
A
VIN = –13 V, SD/CT = 0 V
15
45
A
TA = 0°C to 100°C
(3)
Quiescent current in shutdown
VIN = –13 V, SD/CT = 0 V
100
A
TA = –55°C to 0°C
(3)
Shutdown threshold
At shutdown pin (SD/CT)
–1.0
–0.7
–0.4
V
Shutdown input current
SD/CT = 0 V
5
10
25
A
Output leakage in shutdown
VIN = –15 V, VOUT = 0 V(4)
1
50
A
Overtemperature shutdown
140
°C
Overtemperature hysteresis
20
°C
UCC284-ADJ Adjustable 0.5-A Current Limit Section
Peak current limit
VOUT = 0 V
0.7
1.1
1.5
A
Overcurrent threshold
0.55
0.7
0.9
A
Current limit duty cycle
VOUT = 0 V
2.5
4
%
Overcurrent time out, tON
VOUT = 0 V
300
500
700
s
(2)
The internal charge pump is enabled only for dropout condition with low VIN. Only in this condition is the charge pump required to
provide additional output FET fate drive to maintain dropout specifications. For conditions where the charge pump is not required, it is
disabled, which lowers overall device power consumption.
(3)
Ensured by design. Not production tested.
(4)
In the application during shutdown mode, output leakage current adds to quiescent current.
GND: This is the low noise ground reference input. All voltages are measured with respect to the GND pin.
SD/CT: This is the shutdown pin and also the short-circuit timing pin. Pulling this pin more positive than –0.7 V
puts the circuit in a low-current shutdown mode. Placing a timing capacitor between this pin and GND sets the
short-circuit charging time, tON during an overcurrent condition. During an overcurrent condition, the output pulses
at approximately a 2.5% duty cycle.
NOTE:
The CT capacitor must be connected between this pin and GND, not VIN, to assure
that the SD/CT pin is not pulled significantly negative during power-up. This pin
should not be externally driven more negative than –5 V or the device will be
damaged.
VIN: This is the negative input supply. Bypass this pin to GND with at least 1
F of low ESR or ESL capacitance.
VOUT: Regulated negative-output voltage. A single 4.7–
F capacitor should be connected between this pin and
GND. Smaller value capacitors can be used for light loads, but this degrades the load-step performance of the
regulator.
Copyright 2008, Texas Instruments Incorporated
5
Product Folder Link(s): UCC284-EP
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