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参数资料
| 型号： | MAX1813 |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | 数字信号处理 |
| 英文描述： | Replaced by TMS320VC5506 : Digital Signal Processors 144-LQFP |
| 中文描述： | 动态可调、同步降压型控制器，集成电压定位电路 |
| 文件页数： | 14/38页 |
| 文件大小： | 738K |
| 代理商： | MAX1813 |
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M
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
14
______________________________________________________________________________________
Detailed Description
The MAX1813 buck controller is targeted for low-volt-
age, high-current CPU core power supplies for note-
book computers, which typically exhibit 0 to 22A (or
greater) load steps. The proprietary Quick-PWM pulse-
width modulator in the converter is specifically
designed for handling fast load steps while maintaining
a relatively constant operating frequency and inductor
operating point over a wide range of input voltages.
The Quick-PWM architecture circumvents the poor
load-transient timing problems of fixed-frequency cur-
rent-mode PWMs while also avoiding the problems
caused by widely varying switching frequencies in con-
ventional constant on-time and constant off-time PFM
schemes.
+5V Bias Supply (V
CC
and V
DD
)
The MAX1813 requires an external +5V bias supply in
addition to the battery. Typically, this +5V bias supply
is the notebook
’
s 95% efficient +5V system supply.
Keeping the bias supply external to the IC improves
efficiency and eliminates the cost associated with the
+5V linear regulator that would otherwise be needed to
supply the PWM circuit and gate drivers. If stand-alone
capability is needed, the +5V supply can be generated
with an external linear regulator.
The +5V bias supply powers V
CC
(PWM controller) and
V
DD
(gate-drive power). The maximum current is:
I
BIAS
= I
CC
+
SW
(Q
G1
+ Q
G2
) = 15mA to 45mA (typ)
where I
CC
is 1.4mA (typ),
SW
is the switching frequen-
cy, and Q
G1
and Q
G2
are the MOSFET total gate-
charge specification limits at V
GS
= 5V.
The battery input (V+) and +5V bias inputs (V
CC
and
V
DD
) can be connected together if the input source is a
fixed 4.5V to 5.5V supply. If the +5V bias supply is
powered up prior to the battery supply, the enable sig-
nal (SKP/
SDN
) must be delayed until the battery volt-
age is present in order to ensure startup.
Free-Running, Constant-On-Time PWM
Controller with Input Feed-Forward
The Quick-PWM control architecture is a constant-on-
time, current-mode type with voltage feed-forward
V
CC
C
OUT
D2
L1
0.68
μ
H
1.4V OUTPUT
UP TO 22A
PGOOD
ILIM
D1
C2
1
μ
F
C
BST
0.1
μ
F
Q
H
Q
L
C1
1
μ
F
R1
20
C
IN
BATTERY (V
BATT
)
7V TO 24V
CC
TIME
+5V INPUT
BIAS SUPPLY
POWER-GOOD
INDICATOR
DL
LX
V+
DH
BST
VPCS
PGND
GND
ZMODE
FB
TON
V
DD
MAX1813
REF
SUS
S0
S1
CODE
D0
D1
D2
D3
D4
TO V
CC
OPEN
OPEN
SUSPEND
MODE
R
GATE
100k
R
TIME
120k
R
AVPS
150k
C
REF
0.22
μ
F
C
COMP
47pF
OPEN (FORCED-PWM)
OPEN (300kHz)
R
SENSE
R
VPCS
100
R
FB
100
C
VPCS
1nF
C
FB
1nF
SKP/SDN
NOTE:
SEE TABLE 1 FOR COMPLETE
LIST OF COMPONENT VALUES
Figure 1. Standard High-Power Application Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| MAX182AEWI | Calivrated 4-Channel 12-Bit ADC with T/H and Refernce |
| MAX182AEPI | Calivrated 4-Channel 12-Bit ADC with T/H and Refernce |
| MAX182BEPI | Calivrated 4-Channel 12-Bit ADC with T/H and Refernce |
| MAX182ACPI | Replaced by TMS320BC52 : Digital Signal Processors 100-LQFP -40 to 85 |
| MAX182ACWI | Replaced by TMS320BC52 : |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1813EEI | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1813EEI+ | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1813EEI+T | 功能描述:DC/DC 开关控制器 Dynamically Adjustable Synchronous Step-Down Controller w/Integrated Voltage Positioning RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1813EEI-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1813EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1813 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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