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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1636 Datasheet

Low-Voltage / Precision Step-Down Controller for Portable CPU Power

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MAX1636 pdf
19-1268; Rev 0; 8/97
EVAALVUAAILTAIOBNLEKIT
Low-Voltage, Precision Step-Down
Controller for Portable CPU Power
_______________General Description
The MAX1636 is a synchronous, buck, switch-mode,
power-supply controller that generates the CPU supply
voltage in battery-powered systems. It achieves ±1%
output voltage accuracy and offers the excellent load-
transient response needed by upcoming generations of
dynamic-clock CPUs.
Up to 95% efficiency is achieved through synchronous
rectification and Maxim’s proprietary Idle Mode™ con-
trol scheme. Efficiency is greater than 80% over a
1000:1 load-current range, extending battery life in sys-
tem-suspend or standby modes. Excellent dynamic
response corrects output load transients caused by the
latest dynamic-clock CPUs within five 300kHz clock
cycles. Strong, 1A, on-board gate drivers ensure fast,
external N-channel MOSFET switching.
The MAX1636 features a logic-controlled and synchro-
nizable, fixed-frequency, pulse-width-modulation (PWM)
operating mode that reduces noise and RF interference
in sensitive mobile communications and pen-entry appli-
cations. Holding SKIP high forces fixed-frequency mode
for lowest noise under all load conditions.
For a low-cost version that omits the +5V VL linear-
regulator block and comes in a smaller 16-pin QSOP
package, refer to the MAX1637 data sheet.
________________________Applications
Notebook Computers
Subnotebook Computers
Desktop Computers
Bus-Termination Supplies
__________________Pin Configuration
____________________________Features
o ±1% DC Accuracy (Adjustable Mode)
o Output Overvoltage Crowbar Protection
o Output Undervoltage Shutdown
o Adjustable Switching Frequency to 340kHz
o Low-Dropout Operation
o Idle Mode Pulse-Skipping Operation
o 1.10V to 5.5V Adjustable Output Voltage
o 2.5V/3.3V Dual-Mode Fixed-Output Settings
o Internal Digital Soft-Start
o 1.1V ±1% Reference Output
o 3µA (typ) Shutdown Current
o Open-Drain Power-Good Output (RESET)
o 20-Pin SSOP Package
______________Ordering Information
PART
MAX1636EAP
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
20 SSOP
__________Typical Operating Circuit
VIN
V+ SHDN OVP
VL
VCC
TOP VIEW
CSH 1
CSL 2
RESET 3
SHDN 4
OVP 5
CC 6
REF 7
SYNC 8
GND 9
GND 10
MAX1636
20 SKIP
19 LX
18 DH
17 BST
16 PGND
15 DL
14 VL
13 V+
12 VCC
11 FB
SSOP
Idle Mode is a trademark of Maxim Integrated Products.
CC DH
BST
LX
MAX1636
DL
SKIP
SYNC
GND
PGND
CSH
CSL
REF FB
RESET
GND
TO µP
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
For small orders, phone 408-737-7600 ext. 3468.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1636 Datasheet

Low-Voltage / Precision Step-Down Controller for Portable CPU Power

No Preview Available !

MAX1636 pdf
Low-Voltage, Precision Step-Down
Controller for Portable CPU Power
ABSOLUTE MAXIMUM RATINGS
V+ to GND ...............................................................-0.3V to 36V
GND to PGND........................................................................±2V
SHDN to GND. ......................................................... -0.3V to 36V
LX, BST to GND. ...................................................... -0.3V to 36V
DH, BST to LX .............................................................-0.3V to 6V
VL, VCC, CSL, CSH, FB, SKIP to GND ...................... -0.3V to 6V
DL to GND.. ..................................................-0.3V to (VL + 0.3V)
REF, RESET, SYNC, CC, OVP to GND. ..... -0.3V to (VCC + 0.3V)
VL Output Current... ............................................................50mA
VL Short Circuit to GND..............................................Momentary
REF Output Current ............................................................20mA
REF Short Circuit to GND ....... ......................................Indefinite
Continuous Power Dissipation (TA = +70°C)
SSOP (derate 8.00mW/°C above +70°C) .....................640mW
Operating Temperature Range
MAX1636EAP. ..................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10sec) .............................+300°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.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = 15V, SYNC = VL = VCC, IVL = 0mA, IREF = 0mA, TA = 0°C to +85°C, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
SMPS CONTROLLER
Input Voltage Range, V+
Input source for VL regulator
4.5 30 V
Input Voltage Range, VL
Gate-driver supply rail
4.2 5.5 V
Input Voltage Range, VCC
Internal chip supply rail
3.15 5.5 V
Output Voltage, Adj Mode
FB tied to VOUT, 0mV < (CSH - CSL) < 80mV, 4.5V
< V+ < 30V (includes line and load regulation)
1.090
1.100
1.110
V
Output Voltage, Fixed 2.5V Mode
FB tied to VCC, 0mV < (CSH - CSL) < 80mV, 4.5V
< V+ < 30V (includes line and load regulation)
2.486
2.55
2.614
V
Output Voltage, Fixed 3.3V Mode
Output Adjustment Range
Current-Limit Threshold
Power Consumption
Shutdown Supply Current (V+)
FB Input Current
Soft-Start Ramp Time
Idle Mode Switchover Threshold
FB tied to GND, 0mV < (CSH - CSL) < 80mV, 4.5V
< V+ < 30V (includes line and load regulation)
VCC = VL = 5V
VCC = 3.3V, VL = 5V
Positive direction
Negative direction
VCC = 5V, output not switching
VCC = 3.3V, output not switching
SHDN = GND, OVP = GND
FB forced to REF
SHDN to full current limit, five levels
CSH - CSL
3.282
VREF
VREF
80
-145
-50
20
3.366
100
-100
3
512
30
3.450
5.5
3.6
120
-55
2.0
1.5
10
50
40
V
V
mV
mV
mW
µA
nA
clks
mV
2 _______________________________________________________________________________________


Part Number MAX1636
Description Low-Voltage / Precision Step-Down Controller for Portable CPU Power
Maker Maxim
Total Page 24 Pages
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