19-1268; Rev 2; 12/00
MAX1636 CPU Supply Evaluation Kit
General Description
The MAX1636 CPU supply evaluation kit (EV kit) circuit
is intended for converting high-voltage battery power
into a low-voltage supply rail for next-generation note-
book CPU cores. The output is digitally adjustable
between 1.25V and 2V, in 50mV increments. The input
range is +7V to +22V. It delivers up to 7A output current
with greater than 87% efficiency. The MAX1636 features
卤1% DC output accuracy over all conditions of line,
load, and temperature. The fully assembled and tested
EV kit has excellent dynamic response to correct for fast
load transients.
This EV kit is very specific to notebook CPU core power
supplies, and includes a digital-to-analog converter
(DAC), op-amp buffer, and other high-performance
components tailored to this demanding application.
However, the MAX1636 is a general-purpose, stand-
alone device that can be used without the DAC; see the
MAX1636 data sheet for standard application circuits.
____________________________Features
o
+7V to +22V Input Voltage Range
o
Digitally Adjustable 1.25V to 2V Output Voltage
o
7A Output Current Capability
o
卤1% DC Output Accuracy
o
Efficiency = 87%, V
IN
= 7V, V
OUT
= 1.7V
(at I
OUT
= 3A)
o
Fast MOSFETs for Low Switching Losses
o
Tight PC Board Layout for Low Switching Losses
o
Power-Good Output
o
300kHz Switching Frequency
o
Overvoltage and Undervoltage Protection
o
Surface-Mount Construction
o
Fully Assembled and Tested
Evaluates: MAX1636
Ordering Information
PART
MAX1636CPUEVKIT
TEMP. RANGE
0掳C to +70掳C
IC PACKAGE
20 SSOP
Component List
DESIGNATION QTY
C1, C2, C3,
C4
C5, C7, C8,
C9, C10
C11
C12
C13
C14, C15,
C16
C14, C15,
C16, C17
C18
D1
DESCRIPTION
10碌F, 25V ceramic capacitors
Tokin C34Y5U1E106Z or
United Chemicon/Marcon
THCR50E1E106ZT
0.1碌F ceramic capacitors
1500pF ceramic capacitor
1碌F ceramic capacitor
4.7碌F, 16V tantalum capacitor
Sprague 595D475X0016A2B
470碌F, 6.3V, 30m鈩?low-ESR
tantalum capacitors
Kemet T510X477M006
or
470碌F, 4V,
470碌F, 4V, 55m鈩?low-ESR tantalum
low-ESR tantalum capacitors
caps Sprague 594D477X0004R2T
Sprague 594D477X0004R2T
Open
Schottky diode
SGS-Thomson STPS2L25U,
International Rectifier 10BQ040, or
Motorola MBRS130LT3
Schottky diode
Central Semiconductor CMPSH-3
N2
1
DESIGNATION QTY
DESCRIPTION
2.2碌H power inductor
Panasonic P1F2R0HL,
Coiltronics UP4-2R2, or
Coilcraft DO5022P-222HC
N-channel MOSFET
Fairchild FDS9412,
International Rectifier IRF7803, or
Siliconix Si9804DY
N-channel MOSFET
Fairchild FDS6680,
International Rectifier IRF7801, or
Siliconix Si4420DY
0.010鈩? 1%, 1W resistor
Dale WSL-2512-R010F
10k鈩? 0.1% resistor
Dale TNPW-1206 series
110k鈩? 0.1% resistor
Dale TNPW-1206 series
13.7k鈩? 0.1% resistor
Dale TNPW-1206 series
51鈩? 5% resistor
100k鈩? 5% resistors
4
L1
1
5
1
1
1
N1
1
3
R1
R2
R3
R4
R5
R6, R15
1
1
1
1
1
2
4
0
1
D2
1
________________________________________________________________
Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim鈥檚 website at www.maxim-ic.com.
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