没有合适的资源?快使用搜索试试~ 我知道了~
MAX1902EAI+T maxim 美信芯片 电子元器件中文版规格手册.pdf
需积分: 5 0 下载量 188 浏览量
2023-06-07
10:02:19
上传
评论
收藏 644KB PDF 举报
温馨提示
试读
34页
MAX1902EAI+T maxim 美信芯片 电子元器件中文版规格手册
资源推荐
资源详情
资源评论
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.
General Description
The MAX1901/MAX1902/MAX1904 are buck-topology,
step-down, switch-mode, power-supply controllers that
generate logic-supply voltages in battery-powered sys-
tems. These high-performance, dual/triple-output devices
include on-board power-up sequencing, power-good sig-
naling with delay, digital soft-start, secondary winding
control, low dropout circuitry, internal frequency-compen-
sation networks, and automatic bootstrapping.
Up to 97% efficiency is achieved through synchronous
rectification and Maxim’s proprietary Idle Mode™ control
scheme. Efficiency is greater than 80% over a 1000:1
load-current range, which extends battery life in system
suspend or standby mode. Excellent dynamic response
corrects output load transients within five clock cycles.
Strong 1A on-board gate drivers ensure fast external N-
channel MOSFET switching.
These devices feature a logic-controlled and synchroniz-
able, fixed-frequency, pulse-width modulation (PWM)
operating mode. This reduces noise and RF interference
in sensitive mobile communications and pen-entry appli-
cations. Asserting the SKIP pin enables fixed-frequency
mode, for lowest noise under all load conditions.
The MAX1901/MAX1902/MAX1904 include two PWM reg-
ulators, adjustable from 2.5V to 5.5V with fixed 5.0V and
3.3V modes. All these devices include secondary feed-
back regulation, and the MAX1902 contains a 12V/120mA
linear regulator. The MAX1901/MAX1904 include a sec-
ondary feedback input (SECFB), plus a control pin
(STEER) that selects which PWM (3.3V or 5V) receives the
secondary feedback signal. SECFB provides a method
for adjusting the secondary winding voltage regulation
point with an external resistor divider, and is intended to
aid in creating auxiliary voltages other than fixed 12V.
The MAX1901/MAX1902 contain internal output overvolt-
age and undervoltage protection features.
________________________Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Desktop CPU Local DC-DC Converters
Features
♦ 97% Efficiency
♦ 4.2V to 30V Input Range
♦ 2.5V to 5.5V Dual Adjustable Outputs
♦ Selectable 3.3V and 5V Fixed or Adjustable
Outputs (Dual Mode™)
♦ 12V Linear Regulator
♦ Adjustable Secondary Feedback
(MAX1901/MAX1904)
♦ 5V/50mA Linear Regulator Output
♦ Precision 2.5V Reference Output
♦ Programmable Power-Up Sequencing
♦ Power-Good (RESET) Output
♦ Output Overvoltage Protection
(MAX1901/MAX1902)
♦ Output Undervoltage Shutdown
(MAX1901/MAX1902)
♦ 333kHz/500kHz Low-Noise, Fixed-Frequency
Operation
♦ Low-Dropout, 98% Duty-Factor Operation
♦ 2.5mW Typical Quiescent Power (12V input, both
SMPSs on)
♦ 4µA Typical Shutdown Current
MAX1901/MAX1902/MAX1904
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
________________________________________________________________ Maxim Integrated Products 1
5V
LINEAR
12V
LINEAR
POWER-UP
SEQUENCE
POWER-
GOOD
3.3V
SMPS
5V
SMPS
RESETON/OFF
5V (RTC)
3.3V
INPUT
5V
12V
Functional Diagram
19-2224; Rev 3; 12/03
Ordering Information
Idle Mode is a trademark of Maxim Integrated Products, Inc.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX1901EAI -40°C to +85°C 28 SSOP
MAX1901ETJ -40°C to +85°C32 Thin QFN 5m m x 5m m
MAX1902EAI -40°C to +85°C 28 SSOP
MAX1902ETJ -40°C to +85°C32 Thin QFN 5m m x 5m m
MAX1904EAI -40°C to +85°C 28 SSOP
MAX1904ETJ -40°C to +85°C32 Thin QFN 5m m x 5m m
MAX1901/MAX1902/MAX1904
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = 15V, both PWMs on, SYNC = V
L
, V
L
load = 0, REF load = 0, SKIP = 0, T
A
= 0°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V+ to GND ..............................................................-0.3V to +36V
PGND to GND.....................................................................±0.3V
V
L
to GND ................................................................-0.3V to +6V
BST3, BST5 to GND ..............................................-0.3V to +36V
CSH3, CSH5 to GND................................................-0.3V to +6V
FB3 to GND ..............................................-0.3V to (CSL3 + 0.3V)
FB5 to GND ...............................................-0.3V to (CSL5 +0.3V)
LX3 to BST3..............................................................-6V to +0.3V
LX5 to BST5..............................................................-6V to +0.3V
REF, SYNC, SEQ, STEER, SKIP,
TIME/ON5, SECFB, RESET to GND ........-0.3V to (V
L
+ 0.3V)
V
DD
to GND............................................................-0.3V to +20V
RUN/ON3, SHDN to GND.............................-0.3V to (V+ + 0.3V)
12OUT to GND ..........................................-0.3V to (V
DD
+ 0.3V)
DL3, DL5 to PGND........................................-0.3V to (V
L
+ 0.3V)
DH3 to LX3 ..............................................-0.3V to (BST3 + 0.3V)
DH5 to LX5 ..............................................-0.3V to (BST5 + 0.3V)
V
L
, REF Short to GND ................................................Momentary
12OUT Short to GND..................................................Continuous
REF Current...........................................................+5mA to -1mA
V
L
Current.........................................................................+50mA
12OUT Current . .............................................................+200mA
V
DD
Shunt Current............................................................+15mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin SSOP (derate 9.52mW/°C above +70°C) ......762mW
32-Pin Thin QFN (derate 21.3mW/°C above +70°C) ..1702mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10s) ................................+300°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
MAIN SMPS CONTROLLERS
Input Voltage Range 4.2 30.0 V
3V Output Voltage in Adjustable Mode
V+ = 4.2V to 30V, CSH3 - CSL3 = 0,
CSL3 tied to FB3
2.42 2.5 2.58 V
3V Output Voltage in Fixed Mode
V+ = 4.2V to 30V, 0 < CSH3 - CSL3
< 80mV, FB3 = 0
3.20 3.39 3.47 V
5V Output Voltage in Adjustable Mode
V+ = 4.2V to 30V, CSH5 - CSL5 = 0,
CSL5 tied to FB5
2.42 2.5 2.58 V
5V Output Voltage in Fixed Mode
V+ = 5.3V to 30V, 0 < CSH5 - CSL5
< 80mV, FB5 = 0
4.85 5.13 5.25 V
Output Voltage Adjust Range Either SMPS REF 5.5 V
Adjustable-Mode Threshold Voltage Dual-mode comparator 0.5 1.1 V
Load Regulation Either SMPS, 0 < CSH_ - CSL_ < 80mV -2 %
Line Regulation Either SMPS, 5.2V < V+ < 30V 0.03 %/V
CSH3 - CSL3 or CSH5 - CSL5 80 100 120
Current-Limit Threshold
SKIP = V
L
or V
DD
< 13V or SECFB < 2.44V -50 -100 -150
mV
Idle Mode Threshold SKIP = 0, not tested 10 25 40 mV
Soft-Start Ramp Time
From enable to 95% full current limit with
respect to f
OSC
(Note 1)
512 clks
SYNC = V
L
450 500 550
Oscillator Frequency
SYNC = 0 283 333 383
kHz
MAX1901/MAX1902/MAX1904
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, both PWMs on, SYNC = V
L
, V
L
load = 0, REF load = 0, SKIP = 0, T
A
= 0°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
SYNC = V
L
95 97
Maximum Duty Factor
SYNC = 0 (Note 2) 96.5 98
%
SYNC Input High-Pulse Width Not tested 200 ns
SYNC Input Low-Pulse Width Not tested 200 ns
SYNC Rise/Fall Time Not tested 200 ns
SYNC Input Frequency Range 400 583 kHz
Current-Sense Input Leakage Current
V+ = V
L
= 0,
CSL3 = CSH3 = CSL5 = CSH5 = 5.5V
0.01 10 µA
FLYBACK CONTROLLER
V
DD
Regulation Threshold Falling edge (Note 3) 13 14 V
SECFB Regulation Threshold Falling edge (MAX1901/MAX1904) 2.44 2.60 V
DL Pulse Width V
DD
< 13V or SECFB < 2.44V 0.75 µs
V
DD
Shunt Threshold Rising edge, hysteresis = 1% (Note 3) 18 20 V
V
DD
Shunt Sink Current V
DD
= 20V (Note 3) 10 mA
V
DD
Leakage Current V
DD
= 5V, off mode (Notes 3, 4) 30 µA
12V LINEAR REGULATOR (Note 3)
12OUT Output Voltage 13V < V
DD
< 18V, 0 < I
LOAD
< 120mA 11.65 12.10 12.50 V
12OUT Current Limit 12OUT forced to 11V, V
DD
= 13V 150 mA
Quiescent V
DD
Current V
DD
= 18V, run mode, no 12OUT load 50 100 µA
INTERNAL REGULATOR AND REFERENCE
V
L
Output Voltage
SHDN = V+, RUN/ON3 = TIME/ON5 = 0,
5.4V < V+ < 30V, 0mA < I
LOAD
< 50mA
4.7 5.1 V
V
L
Undervoltage Lockout-Fault Threshold Falling edge, hysteresis = 1% 3.5 3.6 3.7 V
V
L
Switchover Threshold Rising edge of CSL5, hysteresis = 1% 4.2 4.5 4.7 V
REF Output Voltage No external load (Note 5) 2.45 2.5 2.55 V
0 < I
LOAD
< 50µA 12.5
REF Load Regulation
0 < I
LOAD
< 5mA 100.0
mV
REF Sink Current 10 µA
REF Fault-Lockout Voltage Falling edge 1.8 2.4 V
V+ Operating Supply Current V
L
switched over to CSL5, 5V SMPS on 5 50 µA
V+ Standby Supply Current
V+ = 5.5V to 30V, both SMPSs off, includes
current into SHDN
30 60 µA
V+ Standby Supply Current in Dropout
V+ = 4.2V to 5.5V, both SMPSs off, includes
current into SHDN
50 200 µA
V+ Shutdown Supply Current V+ = 4.0V to 30V, SHDN = 0 4 10 µA
(Note 3) 2.5 4
Quiescent Power Consumption
Both SMPSs enabled,
FB3 = FB5 = 0,
CSL3 = CSH3 = 3.5V,
CSL5 = CSH5 = 5.3V
MAX1901/MAX1904 1.5 4
mW
MAX1901/MAX1902/MAX1904
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, both PWMs on, SYNC = V
L
, V
L
load = 0, REF load = 0, SKIP = 0, T
A
= 0°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
FAULT DETECTION (MAX1901/MAX1902)
Overvoltage Trip Threshold With respect to unloaded output voltage 4 7 10 %
Overvoltage Fault Propagation Delay
CSL_ driven 2% above overvoltage trip
threshold
1.5 µs
Output Undervoltage Threshold With respect to unloaded output voltage 60 70 80 %
Output Undervoltage Lockout Time
From each SMPS enabled, with respect to
f
OSC
5,000 6,144 7,000 clks
Thermal-Shutdown Threshold Typical hysteresis = 10°C 150 °C
RESET
RESET Trip Threshold
With respect to unloaded output voltage,
falling edge; typical hysteresis = 1%
-7 -5.5 -4 %
RESET Propagation Delay
Falling edge, CSL_ driven 2% below RESET
trip threshold
1.5 µs
RESET Delay Time With respect to f
OSC
27,000 32,000 37,000 clks
INPUTS AND OUTPUTS
Feedback-Input Leakage Current FB3, FB5; SECFB = 2.6V 1 50 nA
Logic Input-Low Voltage
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC
0.6 V
Logic Input-High Voltage
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC
2.4 V
Input Leakage Current
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC, SEQ; V
PIN
= 0V or 3.3V
±1µA
Logic Output-Low Voltage RESET, I
SINK
= 4mA 0.4 V
Logic Output-High Current RESET = 3.5V 1 mA
TIME/ON5 Input Trip Level SEQ = 0 or V
L
2.4 2.6 V
TIME/ON5 Source Current TIME/ON5 = 0, SEQ = 0 or V
L
2.5 3 3.5 µA
TIME/ON5 On-Resistance TIME/ON5; RUN/ON3 = 0, SEQ = 0 or V
L
15 80 Ω
Gate-Driver Sink/Source Current DL3, DH3, DL5, DH5; forced to 2V 1 A
SSOP package 1.5 7
Gate-Driver On-Resistance High or low (Note 6)
QFN package 1.5 8
Ω
MAX1901/MAX1902/MAX1904
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS
(V+ = 15V, both PWMs on, SYNC = V
L
, V
L
load = 0, REF load = 0, SKIP = 0, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 7)
PARAMETER CONDITIONS MIN TYP MAX UNITS
MAIN SMPS CONTROLLERS
Input Voltage Range 4.2 30.0 V
3V Output Voltage in Adjustable Mode
V+ = 4.2V to 30V, CSH3 - CSL3 = 0,
CSL3 tied to FB3
2.42 2.58 V
3V Output Voltage in Fixed Mode
V+ = 4.2V to 30V, 0 < CSH3 - CSL3
< 80mV, FB3 = 0
3.20 3.47 V
5V Output Voltage in Adjustable Mode
V+ = 4.2V to 30V, CSH5 - CSL5 = 0,
CSL5 tied to FB5
2.42 2.58 V
5V Output Voltage in Fixed Mode
V+ = 5.3V to 30V, 0 < CSH5 - CSL5
< 80mV, FB5 = 0
4.85 5.25 V
Output Voltage Adjust Range Either SMPS REF 5.5 V
Adjustable-Mode Threshold Voltage Dual-mode comparator 0.5 1.1 V
CSH3 - CSL3 or CSH5 - CSL5 80 120
Current-Limit Threshold
SKIP = V
L
or V
DD
< 13V or SECFB < 2.44V -50 -150
mV
SYNC = V
L
450 550
Oscillator Frequency
SYNC = 0 283 383
kHz
SYNC = V
L
95
Maximum Duty Factor
SYNC = 0 (Note 2) 97
%
SYNC Input Frequency Range 400 583 kHz
FLYBACK CONTROLLER
V
DD
Regulation Threshold Falling edge (Note 3) 13 14 V
SECFB Regulation Threshold Falling edge (MAX1901/MAX1904) 2.44 2.60
V
DD
Shunt Threshold Rising edge, hysteresis = 1% (Note 3) 18 20
V
V
V
DD
Shunt Sink Current V
DD
= 20V (Note 3) 10 mA
12V LINEAR REGULATOR (Note 3)
12OUT Output Voltage 13V < V
DD
< 18V, 0mA < I
LOAD
< 100mA 11.65 12.50 V
Quiescent V
DD
Current V
DD
= 18V, run mode, no 12OUT load 100 µA
INTERNAL REGULATOR AND REFERENCE
V
L
Output Voltage
SHDN = V+, RUN/ON3 = TIME/ON5 = 0,
5.4V < V+ < 30V, 0 < I
LOAD
< 50mA
4.7 5.1 V
V
L
Undervoltage Lockout-Fault Threshold Falling edge, hysteresis = 1% 3.5 3.7 V
V
L
Switchover Threshold Rising edge of CSL5, hysteresis = 1% 4.2 4.7 V
REF Output Voltage No external load (Note 5) 2.45 2.55 V
0 < I
LOAD
< 50µA 12.5
REF Load Regulation
0 < I
LOAD
< 5mA 100.0
mV
REF Sink Current 10 µA
REF Fault Lockout Voltage Falling edge 1.8 2.4 V
V+ Operating Supply Current V
L
switched over to CSL5, 5V SMPS on 50 µA
剩余33页未读,继续阅读
资源评论
芯脉芯城
- 粉丝: 3
- 资源: 4031
上传资源 快速赚钱
- 我的内容管理 展开
- 我的资源 快来上传第一个资源
- 我的收益 登录查看自己的收益
- 我的积分 登录查看自己的积分
- 我的C币 登录后查看C币余额
- 我的收藏
- 我的下载
- 下载帮助
安全验证
文档复制为VIP权益,开通VIP直接复制
信息提交成功