Changes to Table 3 ............................................................................ 4
5/2016—Rev. 0 to Rev. A
Added Note 1 to Table 2; Renumbered Sequentially ................... 4
Change to Figure 4 ........................................................................... 6
Change to Programmable Precision Enable Section ................. 16
3/2016—Revision 0: Initial Version
Rev. B | Page 2 of 22
Data Sheet
SPECIFICATIONS
V
IN
= V
OUT
+ 0.5 V or 2.3 V, whichever is greater; V
EN
= V
IN
; I
LOAD
= 10 mA; C
IN
= C
OUT
= 10 µF; C
REG
= C
REF
= C
BYP
= 1 µF;
T
A
= 25°C for typical specifications; T
A
= −40°C to +125°C for minimum/maximum specifications, unless otherwise noted.
Table 2.
Parameter
INPUT VOLTAGE RANGE
LOAD CURRENT
OPERATING SUPPLY CURRENT
SHUTDOWN CURRENT
NOISE
1
Output Noise
Noise Spectral Density
POWER SUPPLY REJECTION RATIO
1
Symbol
V
IN
I
LOAD
I
GND
I
IN_SD
OUT
NOISE
OUT
NSD
PSRR
Test Conditions/Comments
Min
2.3
Typ
ADP7158
I
LOAD
= 0 µA
I
LOAD
= 2 A
EN = GND
V
OUT
= 1.2 V to 3.3 V
10 Hz to 100 kHz
100 Hz to 100 kHz
10 kHz to 1 MHz
1 kHz to 100 kHz, V
IN
= 4.0 V, V
OUT
= 3.3 V,
I
LOAD
= 2 A
1 MHz, V
IN
= 4.0 V, V
OUT
= 3.3 V, I
LOAD
= 2 A
1 kHz to 100 kHz, V
IN
= 2.6 V, V
OUT
= 1.8 V,
I
LOAD
= 2 A
1 MHz, V
IN
= 2.6 V, V
OUT
= 1.8 V, I
LOAD
= 2 A
1.2
−0.6
−1.0
−1.5
−0.1
4.0
9.0
0.2
1.6
0.9
1.7
70
50
70
50
Max
5.5
2
8.0
14.0
4
Unit
V
A
mA
mA
µA
µV rms
µV rms
nV/√Hz
dB
dB
dB
dB
OUTPUT VOLTAGE ACCURACY
Output Voltage
2
Initial Accuracy
V
OUT
I
LOAD
= 10 mA, T
A
= 25°C
10 mA < I
LOAD
< 2 A, T
A
= 25°C
10 mA < I
LOAD
< 2 A, T
A
= −40°C to +125°C
∆V
OUT
/∆V
IN
∆V
OUT
/∆I
OUT
I
LIMIT
V
IN
= V
OUT
+ 0.5 V or 2.3 V, whichever is greater
to 5.5 V
I
OUT
= 10 mA to 2 A
3.3
+0.6
+1.0
+1.5
+0.1
0.3
22
3
120
200
650
31
850
650
1.2
0.6
0.5
V
%
%
%
%/V
%/A
mA
A
mV
mV
Ω
kΩ
Ω
Ω
ms
ms
ms
°C
°C
REGULATION
Line
Load
3
CURRENT-LIMIT THRESHOLD
4
REF
VOUT
DROPOUT VOLTAGE
5
PULL-DOWN RESISTANCE
VOUT
VREG
REF
BYP
START-UP TIME
1, 6
VOUT
VREG
REF
THERMAL SHUTDOWN
1
Threshold
Hysteresis
UNDERVOLTAGE THRESHOLDS
Input Voltage
Rising
Falling
Hysteresis
2.4
V
DROPOUT
I
OUT
= 1.2 A, V
OUT
= 3.3 V
I
OUT
= 2 A, V
OUT
= 3.3 V
EN = 0 V, V
IN
= 5.5 V
V
OUT
= 1 V,
V
REG
= 1 V
V
REF
= 1 V
V
BYP
= 1 V
V
OUT
= 3.3 V
3.8
170
280
V
OUT_PULL
V
REG_PULL
V
REF_PULL
V
BYP_PULL
t
START-UP
t
REG_START-UP
t
REF_START-UP
TS
SD
TS
SD_HYS
T
J
rising
150
15
UVLO
RISE
UVLO
FALL
UVLO
HYS
1.95
2.22
2.02
200
2.29
V
V
mV
Rev. B | Page 3 of 22
ADP7158
Parameter
VREG UVLO THRESHOLDS
7
Rising
Falling
Hysteresis
EN INPUT PRECISION
EN Input
Logic High
Logic Low
Logic Hysteresis
LEAKAGE CURRENT
REF_SENSE
EN
1
2
Data Sheet
Symbol
VREGUVLO
RISE
VREGUVLO
FALL
VREGUVLO
HYS
2.3 V ≤ V
IN
≤ 5.5 V
V
EN_HIGH
V
EN_LOW
V
EN_HYS
I
REF_SENSE_LKG
I
EN_LKG
1.13
1.05
1.22
1.13
90
10
0.01
1.31
1.22
V
V
mV
nA
µA
Test Conditions/Comments
Min
Typ
Max
1.94
1.60
185
Unit
V
V
mV
EN = V
IN
or GND
1
Guaranteed by characterization but not production tested.
The
ADP7158
is available in 16 standard voltages between 1.2 V and 3.3 V, including 1.2 V, 1.3 V, 1.5 V, 1.6 V, 1.8 V, 2.0 V, 2.2 V, 2.5 V, 2.6 V, 2.7 V, 2.8 V, 2.9 V, 3.0 V, 3.1 V,
3.2 V, and 3.3 V.
3
Based on an endpoint calculation using 10 mA and 2 A loads.
4
Current-limit threshold is defined as the current at which the output voltage drops to 90% of the specified typical value. For example, the current limit for a 3.0 V
output voltage is defined as the current that causes the output voltage to drop to 90% of 3.0 V, or 2.7 V.
5
Dropout voltage is defined as the input to output voltage differential when the input voltage is set to the nominal output voltage. Dropout voltage applies only for
output voltages greater than 2.3 V.
6
Start-up time is defined as the time between the rising edge of V
EN
to V
OUT
, V
REG
, or V
REF
being at 90% of its nominal value.
7
The output voltage is disabled until the VREG UVLO rise threshold is crossed. The VREG output is disabled until the input voltage UVLO rising threshold is crossed.
INPUT AND OUTPUT CAPACITORS, RECOMMENDED SPECIFICATIONS
Table 3.
Parameter
MINIMUM CAPACITANCE
Input
1
Regulator
Output
1
Bypass
Reference
CAPACITOR EFFECTIVE SERIES RESISTANCE (ESR)
C
OUT
, C
IN
C
REG
, C
REF
C
BYP
1
Symbol
C
IN
C
REG
C
OUT
C
BYP
C
REF
Test Conditions/Comments
T
A
= −40°C to +125°C
Min
7
0.7
7
0.1
0.7
Typ
10.0
1.0
10.0
1.0
1.0
Max
Unit
µF
µF
µF
µF
µF
T
A
= −40°C to +125°C
R
ESR
R
ESR
R
ESR
0.1
0.2
2.0
Ω
Ω
Ω
The minimum input and output capacitance must be greater than 7.0 μF over the full range of operating conditions. The full range of operating conditions in the
application must be considered during device selection to ensure that the minimum capacitance specification is met. X7R and X5R type capacitors are recommended;
Y5V and Z5U capacitors are not recommended for use with any low dropout regulator.
当今的计算机外部设备，都在追求高速度和高通用性。为了满足用户的需求，以Intel为首的七家公司于1994年推出了USB（Universal Serial Bus，通用串行总线）总线协议，专用于低、中速的计算机外设。目前，USB端口已成为微机主板的标准端口；而在不久的将来，所有的微机外设，包括键盘、鼠标、显示器、打印机、数字相机、扫描仪和游戏柄等等，都将通过USB与主机相连。
...[详细]
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