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| 型号： | MAX1557ETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 10TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 5.5 V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
16μA I Q , 1.2A PWM DC-DC
Step-Down Converters
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
—
NAME
IN
GND
SS
OUT
SHDN
D2
PGND
LX
INP
D1
EP
FUNCTION
Supply Voltage Input. Connect to a 2.6V to 5.5V source.
Ground. Connect to PGND.
Soft-Start Control. Connect a 1000pF capacitor (C SS ) from SS to GND to eliminate input-current
overshoot during startup. C SS is required for normal operation of the MAX1556/MAX1557. For greater
than 22μF total output capacitance, increase C SS to C OUT / 22,000 for soft-start. SS is internally
discharged through 200 ? to GND in shutdown.
Output Sense Input. Connect to the output of the regulator. D1 and D2 select the desired output
voltage through an internal feedback resistor-divider. The internal feedback resistor-divider remains
connected in shutdown.
Shutdown Input. Drive SHDN low to enable low-power shutdown mode. Drive high or connect to IN
for normal operation.
OUT Voltage-Select Input. See Table 1.
Power Ground. Connect to GND.
Inductor Connection. Connected to the drains of the internal power MOSFETs. High impedance in
shutdown mode.
Supply Voltage, High-Current Input. Connect to a 2.6V to 5.5V source. Bypass with a 10μF ceramic
capacitor to PGND.
OUT Voltage-Select Input. See Table 1.
Exposed Paddle. Connect to ground plane. EP also functions as a heatsink. Solder to circuit-board
ground plane to maximize thermal dissipation.
Table 1. Output-Voltage-Select Truth Table
Control Scheme
D1
D2
MAX1556
V OUT
MAX1556A
V OUT
MAX1557
V OUT
During PWM operation the converters use a fixed-fre-
quency, current-mode control scheme. The heart of the
current-mode PWM controller is an open-loop, multiple-
Adjustable
Adjustable
input comparator that compares the error-amp voltage
0
0
(V FB = 0.75V)
from 0.75V to
3.3V
(V FB = 0.75V)
from 0.75V to
feedback signal against the sum of the amplified cur-
rent-sense signal and the slope-compensation ramp. At
V IN
V IN
the beginning of each clock cycle, the internal high-side
0
1
1
1
0
1
3.3V
2.5V
1.8V
1.5V
1.2V
2.5V
1.5V
1.3V
1.0V
p-channel MOSFET turns on until the PWM comparator
trips. During this time the current in the inductor ramps
up, sourcing current to the output and storing energy in
the inductor’s magnetic field. When the p-channel turns
A zero represents D_ being driven low or connected to GND.
A 1 represents D_ being driven high or connected to IN.
Detailed Description
The MAX1556/MAX1557 synchronous step-down con-
verters deliver a guaranteed 1.2A/600mA at output volt-
ages from 0.75V to V IN . They use a 1MHz PWM
current-mode control scheme with internal compensation,
allowing for tiny external components and a fast transient
response. At light loads the MAX1556/MAX1557 automat-
ically switch to pulse-skipping mode to keep the quies-
cent supply current as low as 16μA. Figures 2 and 3
show the typical application circuits.
off, the internal low-side n-channel MOSFET turns on.
Now the inductor releases the stored energy while the
current ramps down, still providing current to the output.
The output capacitor stores charge when the inductor
current exceeds the load and discharges when the
inductor current is lower than the load. Under overload
conditions, when the inductor current exceeds the cur-
rent limit, the high-side MOSFET is turned off and the
low-side MOSFET remains on until the next clock cycle.
6
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