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| 型号： | ADP2140ACPZ1218R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/32页 |
| 文件大小： | 2731K |
| 描述： | IC REG DL BCK/LINEAR 10LFCSP |
| 标准包装： | 1 |
| 拓扑： | 降压（降压）同步（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 3MHz |
| 电压/电流 - 输出 1： | 1.2V，600mA |
| 电压/电流 - 输出 2： | 2.8V，300mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 1.65 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘，CSP |
| 供应商设备封装： | 10-LFCSP-WD（3x3） |
| 包装： | 标准包装 |
| 其它名称： | ADP2140ACPZ1218R7DKR |
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Data Sheet
ADP2140
Rev. A | Page 21 of 32
APPLICATIONS INFORMATION
POWER SEQUENCING
The ADP2140 has a flexible power sequencing system
supporting two distinct activation modes:
? Individual activation control is where EN1 controls only
the buck regulator and EN2 controls only the LDO. A high
level on Pin EN1 turns on the buck and a high level on
Pin EN2 turns on the LDO. A logic low level turns off the
respective regulator.
? Autosequencing is where the two regulators turn on in a
specified order and delay after a low-to-high transition on
the EN1 pin.
Select the activation mode (individual or autosequence) by
decoding the state of Pin EN2. The individual activation mode
is selected when the EN2 pin is driven externally or hardwired
to a voltage level (VIN1 or PGND). The autosequencing mode
is selected when the EN2 pin remains unconnected (floating).
To minimize quiescent current consumption, the mode selection
executes one time only during the rising edge of VIN1. The
detection circuit then activates for the time needed to assess the
EN2 state, after which time the circuit is disabled until VIN1 falls
below 0.5 V .
When EN2 is unconnected, the internal control circuit provides
a termination resistance to ground. The 100 k?termination
resistance is low enough to guarantee insensitivity to noise and
transients. The termination resistor is disabled in the event that
the EN2 pin is driven externally to a logic level high (individual
activation mode assumed) to reduce the quiescent current con-
sumption.
When the autosequencing mode is selected, the EN1 pin is used to
start the on/off sequence of the regulators. A logic high sequences
the regulators on whereas a logic low sequences the regulators
off. The regulator activation order is associated with the voltage
selected for the buck regulator and the LDO.
When the turn on or turn off autosequence starts, the start-up
delay between the first and the second regulator is fixed to 5 ms
in PWM mode (tREG12, as shown in Figure 71 and Figure 72).
When the application requires activating and deactivating the
regulators at the same time, use the individual activation mode,
which connects the EN1 and EN2 pins together, as shown in
Figure 75.
Table 6. Power Sequencing Modes
EN2
1
EN1
Description
0
0
Individual mode: both regulators are off.
0
1
Individual mode: buck regulator is on.
1
0
Individual mode: LDO regulator is on.
1
1
Individual mode: both regulators are on.
NC
Rising edge Autosequence: Buck regulator turns on,
then the LDO regulator turns on. The LDO
voltage is less than the buck voltage.
NC
Rising edge Autosequence: LDO regulator turns on,
then the buck regulator turns on. The LDO
voltage is greater than the buck voltage.
NC
Rising edge Autosequence: If the buck voltage is 1.875 V,
then the LDO regulator always turns on first.
NC
Falling edge Autosequence: The LDO and buck regula-
tors turn off at the same time.
1
NC means not connected.
Figure 70 to Figure 75 use the following symbols, as described in
Table 7.
Table 7. Timing Symbols
Symbol
Description
Typical
Value
t
START
Time needed for the internal circuitry
to activate the first regulator
60 約
t
SS
Regulator soft start time
330 約
tRESET
Time delay from power-good
condition to the release of PG
5 ms
t
REG12
Delay time between buck and LDO
activation
5 ms
EN1
V
BUCK
EN2
V
LDO
PG
92% V
BUCK
92% V
LDO
85% V
LDO
t
SS
t
RESET
t
SS
TIME
Figure 70. Individual Activation Mode
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