参数资料
| 型号： | MAX1515ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC REG DDR LV 24-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 转换器，DDR |
| 输入电压： | 1.3 V ~ 3.6 V |
| 输出数： | 2 |
| 输出电压： | 0.5 V ~ 2.7 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
Table 3. Modes of Operation
SHDN
Low
Low
High
High
High
High
MODE
PIN
Low
High
Low
Low
High
High
SKIP
X
X
Low
High
Low
High
REFOUT
BUFFER
Off, High-Z
On
Off, High-Z
Off, High-Z
On
On
STEP-DOWN
REGULATOR MODE
Off
Off
On, non-DDR mode.
FB regulates to preset voltage or 0.5V.
On, non-DDR mode.
FB regulates to preset voltage or 0.5V.
On, DDR mode.
FB regulates to REFIN.
On, DDR mode.
FB regulates to REFIN.
STEP-DOWN
REGULATOR CURRENT
Off
Off
Source only.
Pulse-skipping mode.
Source/sink.
Forced-PWM mode.
Source/sink.
Pulse-skipping mode.
Source/sink.
Forced-PWM mode.
X = Don’t care.
Pulse Skipping (Source Mode)
Connect SKIP to GND to allow the MAX1515 to auto-
Table 4. Output-Voltage Programming
matically switch between high-efficiency pulse-skipping
mode under light loads and PWM mode under heavy
loads. The transition from PWM mode to pulse-skipping
mode occurs when the load current is half the pulse-
skipping mode current threshold (800mA typ).
In pulse-skipping mode, the switching frequency is
reduced to increase efficiency. The inductor current is
discontinuous in this mode, and the MAX1515 only initi-
FBSEL0
GND
GND
V CC
V CC
FBSEL1
GND
V CC
GND
V CC
OUTPUT
VOLTAGE
Adjustable
V FB = V REFIN
1.5V
1.8V
2.5V
ates an LX switching cycle when V FB < V REFIN . When
V FB falls below V REFIN , the high-side NMOS switch
turns on and remains on until output is in regulation and
the current through the switch increases to the positive
pulse-skipping-mode current threshold (I SKIP_P ) of
800mA. When the high-side NMOS switch turns off, the
low-side NMOS synchronous switch turns on and
remains on until the current through the switch decreas-
es to the zero-cross-current threshold of 200mA.
Pulse Skipping (Sink Mode)
When pulse-skipping operation is selected ( SKIP =
GND) while in DDR mode (MODE = V CC ), the
MAX1515’s source/sink controller switches operating
modes when the output voltage crosses either hys-
teretic sink/source thresholds (V REFIN ±25mV). In
pulse-skipping source mode, the MAX1515 regulates
the valley of the output ripple voltage (see the Pulse
Skipping (Source Mode) section). When the output volt-
age rises above the sink-mode threshold, the MAX1515
enters sink mode. The MAX1515 begins each sink-
mode cycle by turning on the low-side NMOS. The low-
side NMOS remains on until the off-time (t OFF ). After the
low-side NMOS turns off, the high-side NMOS turns on
and remains on until the current through the switch
reaches the zero-cross-current threshold of -350mA. As
long as the output voltage remains below the feedback
threshold, the controller remains in the high-impedance
state. Under light-load conditions, this allows the sink-
mode controller to automatically skip pulses. Under
heavy-load conditions, the output voltage remains
above the feedback threshold, forcing the sink-mode
controller to emulate typical forced-PWM operation.
The pulse-skipping current threshold allows the sink-
mode control scheme to automatically switch between
pulse-skipping PFM and nonskipping PWM operation.
This mechanism forces the boundary between continu-
ous and discontinuous inductor-current operation to be
half the negative pulse-skipping current threshold.
Output Voltage in Non-DDR Mode
In non-DDR mode (MODE = GND and V REFIN = V REF ),
the output of the MAX1515 is selectable between one
of three preset output voltages: 2.5V, 1.8V, and 1.5V.
For a preset output voltage, connect FB to the output
voltage and connect FBSEL0 and FBSEL1 as indicated
in Table 4. For an adjustable output voltage, connect
FBSEL0 and FBSEL1 to GND and connect REFIN to a
16
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