http://www.www.datasheet4u.com

900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1854 Datasheet

High-Speed / Adjustable / Synchronous Step-Down Controllers with Integrated Voltage Positioning

No Preview Available !

MAX1854 pdf
19-1758; Rev 0; 8/00
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
General Description
The MAX1716/MAX1854/MAX1855 step-down con-
trollers are intended for core CPU DC-DC converters in
notebook computers. They feature a dynamically
adjustable output (5-bit DAC), ultra-fast transient
response, high DC accuracy, and high efficiency need-
ed for leading-edge CPU core power supplies. Maxim's
proprietary Quick-PWM™ quick-response, constant-on-
time PWM control scheme handles wide input/output
voltage ratios with ease and provides 100ns “instant-on”
response to load transients while maintaining a relative-
ly constant switching frequency.
The MAX1716/MAX1854/MAX1855 are designed
specifically for CPU core applications requiring a volt-
age-positioned supply. The voltage-positioning input
(VPS), combined with a high DC accuracy control loop,
is used to implement a power supply that modifies its
output set point in response to the load current. This
arrangement decreases full-load power dissipation and
reduces the required number of output capacitors.
The 28V input range of the MAX1716/MAX1854/MAX1855
enables single-stage buck conversion from high-volt-
age batteries for the maximum possible efficiency.
Alternatively, the devices’ high-frequency capability
combined with two-stage conversion (stepping down
the +5V system supply instead of the battery) allows
the smallest possible physical size. The output voltage
can be dynamically adjusted through the 5-bit digital-
to-analog converter (DAC) inputs.
The MAX1716/MAX1854/MAX1855 are available in a
24-pin QSOP package. For applications requiring
SpeedStep™ power control (see the MAX1717).
________________________Applications
Notebook Computers
Docking Stations
CPU Core Supply
Single-Stage (BATT to VCORE) Converters
Two-Stage (+5V to VCORE) Converters
PART
MAX1716EEG
MAX1854EEG
MAX1855EEG
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
24 QSOP
24 QSOP
24 QSOP
Features
o High-Efficiency Voltage Positioning
o Quick-PWM Architecture
o ±1% VOUT Line-Regulation Accuracy
o Adjustable Output Range (5-Bit DAC)
MAX1716: 0.925V to 1.6V
MAX1854: 0.925V to 2.0V
MAX1855: 0.600V to 1.75V
o 2V to 28V Input Range
o 200/300/400/550kHz Switching Frequency
o Output Undervoltage Protection
o Overvoltage Protection (MAX1716/MAX1855)
o Drive Large Synchronous-Rectifier MOSFETs
o 1.7ms Digital Soft-Start
o 700µA ICC Supply Current
o 1µA Shutdown Supply Current
o 2V ±1% Reference Output
o VGATE Transition-Complete Indicator
o Small 24-Pin QSOP Package
+5V INPUT
DAC
INPUTS
Typical Operating Circuit
BATTERY
2V TO 28V
VCC
SHDN
ILIM
REF
VDD
V+
BST
DH
MAX1716
CC MAX1854 LX
SKIP MAX1855 DL
GND CS
TON VPS
D0
D1 PGND
D2
D3 FB
D4 VGATE
OUTPUT
Quick-PWM is a trademark of Maxim Integrated Products.
SpeedStep is a trademark of Intel Corp.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1854 Datasheet

High-Speed / Adjustable / Synchronous Step-Down Controllers with Integrated Voltage Positioning

No Preview Available !

MAX1854 pdf
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +30V
VCC, VDD to GND .....................................................-0.3V to +6V
PGND to GND.....................................................................±0.3V
SHDN, VGATE to GND .............................................-0.3V to +6V
ILIM, FB, CC, REF, D0D4, VPS,
TON to GND ...........................................-0.3V to (VCC + 0.3V)
SKIP to GND (Note 1).................................-0.3V to (VCC + 0.3V)
DL to PGND................................................-0.3V to (VDD + 0.3V)
BST to GND ............................................................-0.3V to +36V
DH to LX ....................................................-0.3V to (VBST + 0.3V)
LX to BST..................................................................-6V to +0.3V
CS to GND.................................................................-2V to +30V
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (TA = +70°C)
24-Pin QSOP (derate 9.5mW/°C above +70°C)...........762mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: SKIP may be forced below -0.3V, temporarily exceeding the absolute maximum rating, for the purpose of debugging proto-
type breadboards, using the no-fault test mode. Limit the current drawn to -2mA (max).
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.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = +15V, VCC = VDD = 5V, SKIP = VCC, VPS = PGND, TA = 0°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.)
PARAMETER
PWM CONTROLLER
Input Voltage Range
SYMBOL
CONDITIONS
Battery voltage, V+
VCC, VDD
DAC codes from
1.35V to 2.0V
MIN TYP MAX UNITS
2 28
V
4.5 5.5
-1 1
DC Output Voltage Accuracy
(Notes 2, 3)
V+ = 4.5V to 28V,
VPS = PGND
DAC codes from
0.925V to 1.3V
-1.2
1.2 %
FB Input Bias Current
VPS Input Bias Current
VPS Gain
CS Input Bias Current
ILIM Input Leakage Current
Soft-Start Ramp Time
On-Time (Note 4)
Minimum Off-Time (Note 4)
IFB
IVPS
AVPS
ICS
IILIM
tON
tOFF(MIN)
DAC codes from
0.6V to 0.9V
FB = 0.6V to 2.0V
VVPS = ±40mV
VVPS = 0 or -40mV, gain from VPS to FB
0 to 28V
VILIM = 0 or 5.0V
0 to full ILIM
TON = GND
V+ = 11.0V,
VFB = 1.5V
TON = REF
TON = open
TON = VCC
-1.5
-0.2
-1
0.153
-1
205
280
425
615
0.175
0.01
1.7
255
327
470
678
400
1.5
0.2
1
0.197
1
100
300
375
520
740
500
µA
µA
%/mV
µA
nA
ms
ns
ns
2 _______________________________________________________________________________________


Part Number MAX1854
Description High-Speed / Adjustable / Synchronous Step-Down Controllers with Integrated Voltage Positioning
Maker Maxim
Total Page 30 Pages
PDF Download
MAX1854 pdf
MAX1854 Datasheet PDF
[partsNo] view html
View PDF for Mobile








Similar Datasheet

1 MAX185 (MAX183 - MAX185) High-Speed 12-Bit A/D Converters Maxim Integrated Products
Maxim Integrated Products
MAX185 pdf
2 MAX1852 SC70 Inverting Charge Pumps with Shutdown Maxim
Maxim
MAX1852 pdf
3 MAX1853 SC70 Inverting Charge Pumps with Shutdown Maxim
Maxim
MAX1853 pdf
4 MAX1854 High-Speed / Adjustable / Synchronous Step-Down Controllers with Integrated Voltage Positioning Maxim
Maxim
MAX1854 pdf
5 MAX1855 High-Speed / Adjustable / Synchronous Step-Down Controllers with Integrated Voltage Positioning Maxim
Maxim
MAX1855 pdf
6 MAX1856 Wide Input Range / Synchronizable / PWM SLIC Power Supply Maxim
Maxim
MAX1856 pdf
7 MAX1857 500mA / Low-Dropout / Ripple-Rejecting LDO in MAX Maxim
Maxim
MAX1857 pdf
8 MAX1858A Dual 180 Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR Maxim
Maxim
MAX1858A pdf





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy