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| 型号： | MAX8559EBAJJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.85V .3A 8-UCSP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.85V |
| 输入电压： | 最高 6.5V |
| 电压 - 压降（标准）： | 0.06V @ 100mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 300mA（最小） |
| 电流 - 限制（最小）： | 310mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFBGA，CSPBGA |
| 供应商设备封装： | 8-UCSP（4x2） |
| 包装： | 带卷 (TR) |
Dual, 300mA, Low-Noise Linear Regulator
with Independent Shutdown in UCSP or TDFN
Pin Description
TDFN
PIN
UCSP
NAME
FUNCTION
1
A1
INA
LDO A Regulator Input. Connect to INB. Input voltage can range from 2.5V to 6.5V. Bypass INA
with a ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section).
Shutdown A Input. A logic-low on SHDNA shuts down regulator A. If SHDNA and SHDNB are both
2
A2
SHDNA
low, both regulators and the internal reference are off and the supply current is reduced to 10nA
(typ). If either SHDNA or SHDNB is a logic high, the internal reference is on. Connect SHDNA to
INA for always-on operation of regulator A.
Shutdown B Input. A logic-low on SHDNB shuts down regulator B. If SHDNA and SHDNB are both
3
A3
SHDNB
low, both regulators and the internal reference are off and the supply current is reduced to 10nA
(typ). If either SHDNA or SHDNB is a logic high, the internal reference is on. Connect SHDNB to
INB for always-on operation of regulator B.
4
A4
INB
LDO B Regulator Input. Connect to INA. Input voltage can range from 2.5V to 6.5V. Bypass INB
with a ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section).
Regulator B Output. OUTB can source up to 300mA continuous current. Bypass OUTB with a
5
B4
OUTB
ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section). During
shutdown, OUTB is internally discharged to GND through a 385 Ω resistor.
6
7
B3
B2
GND
BP
Ground
Reference Noise Bypass. Bypass BP with a low-leakage 0.01μF ceramic capacitor for reduced
noise at both outputs.
Regulator A Output. OUTA can source up to 300mA continuous current. Bypass OUTA with a
8
B1
OUTA
ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section). During
shutdown, OUTB is internally discharged to GND through a 385 Ω resistor.
EP
—
Exposed
Paddle
Connect to ground plane. EP also functions as a heatsink. Solder to the circuit-board ground
plane to maximize thermal dissipation.
Detailed Description
The MAX8559 is a dual, low-noise, low-dropout, low-qui-
escent-current linear regulator designed primarily for
battery-powered applications. The regulators are avail-
able with preset 1.5V to 3.3V output voltages. These out-
puts can supply loads up to 300mA with a 4.7μF output
capacitor, or up to 150mA with a 2.2μF output capacitor.
As illustrated in the Functional Diagram , the MAX8559
consists of a 1.25V reference, error amplifiers, P-chan-
nel pass transistors, internal feedback voltage-dividers,
and autodischarge circuitry.
Feedback Control Loop
The 1.25V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares
this reference with the feedback voltage and amplifies
the difference. If the feedback voltage is lower than the
reference voltage, the pass-transistor gate is pulled
lower, allowing more current to pass to the output and
increasing the output voltage. If the feedback voltage is
too high, the pass-transistor gate is pulled up, allowing
less current to pass to the output. The output voltage is
fed back through an internal resistor voltage-divider
connected to OUT_.
Internal P-Channel Pass Transistor
The MAX8559 features two 0.6 Ω P-channel MOSFET
pass transistors. A P-channel MOSFET provides sever-
al advantages over similar designs using PNP pass
transistors, including longer battery life. It requires no
base drive, reducing quiescent current considerably.
PNP-based regulators waste considerable current in
dropout when the pass transistor saturates, and they
also use high base-drive currents under large loads.
The MAX8559 does not suffer from these problems,
and with both outputs on it only consumes 180μA of
6
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