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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1637 Datasheet

Miniature / Low-Voltage / Precision Step-Down Controller

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MAX1637 pdf
19-1321; Rev 1; 2/98
EVAALVUAAILTAIOBNLEKIT
Miniature, Low-Voltage,
Precision Step-Down Controller
General Description
The MAX1637 synchronous, buck, switch-mode power-
supply controller generates the CPU supply voltage in
battery-powered systems. The MAX1637 is a stripped-
down version of the MAX1636 in a smaller 16-pin QSOP
package. The MAX1637 is intended to be powered sep-
arately from the battery by an external bias supply (typi-
cally the +5V system supply) in applications where the
battery exceeds 5.5V. The MAX1637 achieves excellent
DC and AC output voltage accuracy. This device can
operate from a low input voltage (3.15V) and delivers the
excellent load-transient response needed by upcoming
generations of dynamic-clock CPUs.
Using synchronous rectification, the MAX1637 achieves
up to 95% efficiency. Efficiency is greater than 80%
over a 1000:1 load-current range, which extends bat-
tery life in system-suspend or standby mode. Excellent
dynamic response corrects output load transients
caused by the latest dynamic-clock CPUs within five
300kHz clock cycles. Powerful 1A on-board gate driv-
ers ensure fast external N-channel MOSFET switching.
The MAX1637 features a logic-controlled and synchro-
nizable, fixed-frequency, pulse-width-modulation
(PWM) operating mode. This reduces noise and RF
interference in sensitive mobile-communications and
pen-entry applications. Asserting the SKIP pin enables
fixed-frequency mode, for lowest noise under all load
conditions. For a stand-alone device that includes a
+5V VL linear regulator and low-dropout capabilities,
refer to the MAX1636 data sheet.
________________________Applications
Notebook Computers
Subnotebook Computers
Handy-Terminals, PDAs
__________________Pin Configuration
____________________________Features
o ±2% DC Accuracy
o 0.1% (typ) DC Load Regulation
o Adjustable Switching Frequency to 350kHz
o Idle Mode™ Pulse-Skipping Operation
o 1.10V to 5.5V Adjustable Output Voltage
o 3.15V Minimum IC Supply Voltage (at VCC pin)
o Internal Digital Soft-Start
o 1.1V ±2% Reference Output
o 1µA Total Shutdown Current
o Output Overvoltage Crowbar Protection
o Output Undervoltage Shutdown (foldback)
o Tiny 16-Pin QSOP Package
______________Ordering Information
PART
MAX1637EEE
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 QSOP
__________Typical Operating Circuit
VBIAS VBATT
VCC
SHDN
VGG
MAX1637
DH
BST
TOP VIEW
CSH 1
16 SKIP
CSL 2
FB 3
CC 4
MAX1637
15 LX
14 DH
13 BST
REF 5
12 PGND
SHDN 6
SYNC 7
GND 8
11 DL
10 VGG
9 VCC
QSOP
Idle Mode is a trademark of Maxim Integrated Products.
CC
REF
SKIP
SYNC
GND
LX
DL
PGND
CSH
CSL
FB
OUTPUT
________________________________________________________________ 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

MAX1637 Datasheet

Miniature / Low-Voltage / Precision Step-Down Controller

No Preview Available !

MAX1637 pdf
Miniature, Low-Voltage,
Precision Step-Down Controller
ABSOLUTE MAXIMUM RATINGS
GND to PGND .............................................................+2V to -2V
LX, BST to GND......................................................-0.3V to +36V
BST, DH to LX...........................................................-0.3V to +6V
VCC, VGG, CSL, CSH, SHDN to GND.......................-0.3V to +6V
DL to GND..................................................-0.3V to (VGG + 0.3V)
REF, SKIP, SYNC, CC to GND ...................-0.3V to (VCC + 0.3V)
REF Output Current.............................................................20mA
REF Short-Circuit to GND ..............................................Indefinite
Operating Temperature Range ...........................-40°C to +85°C
Continuous Power Dissipation (TA = +70°C)
QSOP (derate 8.3mW/°C above +70°C) ......................667mW
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, VCC = VGG = 5V, SYNC = VCC, IREF = 0mA, TA = 0°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.)
PARAMETER
SMPS CONTROLLER
Input Voltage Range
Output Voltage
Output Adjustment Range
Current-Limit Threshold
Power Consumption
Shutdown Supply Current
FB Input Current
Soft-Start Ramp Time
Idle-Mode Switchover Threshold
AC Load Regulation
INTERNAL REFERENCE
VCC Undervoltage Lockout Threshold
VGG Undervoltage Lockout Threshold
REF Output Voltage
REF Load Regulation
REF Line Regulation
OSCILLATOR
Oscillator Frequency
Maximum Duty Factor
SYNC Input Pulse Width High
SYNC Input Pulse Width Low
SYNC Input Rise/Fall Time
SYNC Input Frequency Range
CONDITIONS
VCC, VGG
FB tied to VOUT, 0mV < (CSH - CSL) < 80mV,
includes line and load regulation
VCC = 5V
VCC = 3.3V
CSH > CSL
CSH < CSL
Output not switching
VCC = VGG = 5V
VCC = VGG = 3.3V
SHDN = GND, VCC = VGG
VFB = VREF
SHDN to full current limit, four levels
CSH - CSL
CSH - CSL = 0mV to CSH - CSL = 100mV
Rising edge, hysteresis = 15mV
Rising edge, hysteresis = 15mV
REF load = 0µA
REF load = 0µA to 50µA
VCC = 3.15V to 5.5V
SYNC = VCC
SYNC = GND
SYNC = VCC
SYNC = GND
(Note 1)
MIN TYP MAX UNITS
3.15
1.080
VREF
VREF
80
-145
-50
20
1.100
100
-100
1.5
1
0.5
512
30
2
5.5 V
1.120
V
5.5
V
3.6
120
mV
-55
2.5
mW
1.75
3 µA
50 nA
clocks
40 mV
%
2.80
2.80
1.080
1.100
3.05
3.05
1.120
10
3
V
V
V
mV
mV
270 300 330
kHz
170 200 230
89 92
93 96
%
200 ns
200 ns
200 ns
240 340 kHz
2 _______________________________________________________________________________________


Part Number MAX1637
Description Miniature / Low-Voltage / Precision Step-Down Controller
Maker Maxim
Total Page 20 Pages
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