参数资料
| 型号： | MAX1515ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/24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) |
19-3507; Rev 1; 3/06
ATION
EVALU
AVAILA
KIT
B LE
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
General Description
Features
The MAX1515 constant-off-time, pulse-width-modulated
(PWM) source/sink step-down DC-DC converter is opti-
mized for use in low-voltage active-termination power
rails or chipset power supplies in notebook and sub-
notebook computers. This device features dual internal
n-channel MOSFET power switches for high efficiency
and reduced component count. External Schottky
diodes are not required. An integrated boost switch
eliminates the need for an external boost diode. The
internal 40m Ω NMOS power switches easily source and
sink continuous load currents up to 3A. The MAX1515
produces an adjustable output from +0.5V to +2.7V
and achieves efficiencies as high as 95%.
The MAX1515 can be configured as a DDR regulator,
producing an output that is exactly half the memory
supply rail. The input of the power stage can be taken
from the memory supply rail itself, resulting in an effi-
cient power supply that returns the energy to the rail
from which it was sourced. The MAX1515 includes a
reference buffer that provides ±5mA of drive current.
The MAX1515 uses a unique current-mode, constant-
off-time, PWM control scheme. A selectable pulse-skip-
ping mode maintains high efficiency during light-load
operation, yet still sources and sinks current on
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Dual 40m Ω Internal n-Channel MOSFETs
Integrated Boost Switch
+1.3V to +3.6V Input Voltage Range
1% V OUT Accuracy Over Line and Load
1MHz Maximum Switching Frequency
DDR Termination Regulator (DDR Mode)
Tracking Output Voltage
Source/Sink Pulse Skipping
±5mA Reference Buffer
Output Voltage (Non-DDR Mode)
+2.5V, +1.8V, or +1.5V Pin Selectable
+0.5V to +2.7V Adjustable
1.1V ±0.75% Reference Output
Adjustable Soft-Start Inrush Current Limiting
< 1μA (typ) Shutdown Supply Current
< 800μA (max) Operating Supply Current
Selectable Pulse-Skipping Operation at Light Loads
Positive and Negative Current Limit
Power-Good Window Comparator
Output Short-Circuit Protection
Ordering Information
demand. The MAX1515 can also be operated in fixed-
PWM mode for low output ripple. The programmable
constant-off-time architecture sets switching frequen-
cies up to 1MHz, which allows the user to optimize per-
formance trade-offs between efficiency, output
switching noise, component size, and cost. The
MAX1515 features an adjustable soft-start to limit surge
PART
MAX1515ETG
MAX1515ETG+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
24 Thin QFN
4mm x 4mm
24 Thin QFN
4mm x 4mm
PKG CODE
T2444-4
T2444-4
currents during startup and a low-power shutdown
mode to disconnect the input from the output and
reduce supply current below 1μA. The MAX1515 is
available in a 24-pin thin QFN package with an
+ Denotes lead-free package.
Minimal Operating Circuit
V BIAS
exposed backside pad.
(3.0V TO 3.6V)
V IN
Applications
V CC
V DD
BST
IN
(1.3V TO 3.6V)
Notebook DDR Memory Termination
Active-Termination Buses
COMP
PGOOD
MAX1515
LX
FB
V OUT = V TT
SHDN
PGND
Chipset/Graphics Processor Supplies
MODE
SKIP
REF
GND
FBSEL0
FBSEL1
V DDQ
(2.5V OR 1.8V)
REFOUT
V REFOUT = V TTR
REFIN
SS
TOFF
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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