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| 型号： | MAX8588ETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/31页 |
| 文件大小： | 0K |
| 描述： | IC PMIC HI EFF LOW IQ 48-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 处理器 |
| 电源电压： | 2.6 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
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High-Efficiency, Low-I Q PMIC with
Dynamic Core for PDAs and Smartphones
Voltage Monitors, Reset, and
Undervoltage-Lockout Functions
Undervoltage Lockout
When the input voltage is below 2.35V (typ), an under-
voltage-lockout (UVLO) circuit disables the IC. The
inputs remain high impedance while in UVLO, reducing
battery load under this condition. All serial registers are
maintained with the input voltage down to at least 2.35V.
100k ?
0.22 μ F
IN
MR
MAX8588
Reset Output (RSO) and MR Input
The reset output ( RSO ) is low when the MR input is low
or when V7 is below 2.425V. V7 is powered from V1
(when enabled) or the backup-battery input (BKBT).
RSO normally goes low:
1) When power is first applied in configurations with no
separate backup battery (external diode from IN to
Figure 2. An RC delay connected from IN to MR ensures that
the 65ms RSO release delay remains in effect for any
sequence of IN and V7.
BKBT).
2) When power is removed in configurations with no
separate backup battery (external diode from IN to
BKBT).
MAIN BATTERY
R1
438k ?
IN
MAX8588
3) If the backup battery falls below 2.425V when V1 is
off or out of regulation.
4) When the manual reset button is pressed ( MR goes
low).
If V IN > 2.4V, an internal timer delays the release of RSO
for 65ms after V7 rises above 2.3V. However, if V IN <
2.4V when V7 exceeds 2.3V, or if V IN and V7 rise at the
same time, RSO deasserts immediately with no 65ms
delay. There is no delay in the second case because the
timer circuitry is deactivated to minimize operating cur-
rent during V IN undervoltage lockout.
If it is desired to have a 65ms RSO release delay for any
sequence of V IN and V7, the circuit in Figure 2 may be
used. An RC connected from IN to MR delays the rise of
MR until after V IN powers up. The 65ms timer is valid for
either sequence of V7 and V IN and does not release until
65ms after both are up. The only regulator output that
affects RSO is V7. RSO will not respond to V1–V6, which
are monitored by POK. Also, RSO is high impedance
and does not function if BKBT is not powered.
MR is a manual reset input for hardware reset. A low
input at MR causes the RSO output to go low for at least
65ms and also resets the V3 output to its default 1.3V set-
ting and turns off the V6 output. MR impacts no other
MAX8588 functions.
Dead-Battery and
Low-Battery Comparators—DBI, LBI
The DBI and LBI inputs monitor input power (usually a
battery) and trigger the DBO and LBO outputs. The
dead-battery comparator triggers DBO when the battery
DBI (1.232V THRESHOLD)
R2
62k ?
LBI (1.00V THRESHOLD)
R3
200k ?
Figure 3. Setting the Low-Battery and Dead-Battery Thresholds
with One Resistor Chain. The values shown set a DBI threshold
of 3.3V and an LBI threshold of 3.5V (no resistors are needed
for the factory preset thresholds).
(V IN ) discharges to the dead-battery threshold. The
factory-set 3.15V threshold is selected by connecting
DBI to IN, or the threshold can be programmed with a
resistor-divider at DBI. The low-battery comparator has
a factory-set 3.6V threshold that is selected by connect-
ing LBI to IN, or its threshold can be programmed with a
resistor-divider at LBI.
One three-resistor-divider can set both DBI and LBI
(R1, R2, and R3 in Figure 3) according to the following
equations:
1) Choose R3 to be less than 250k ?
2) R1 = R3 V LB (1 - (1.232 / V DB ))
3) R2 = R3 (1.232 x (V LB / V DB ) - 1)
where V LB is the low-battery threshold and V DB is the
dead-battery threshold.
20
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