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PDF MAX796 Data sheet ( Hoja de datos )
| Número de pieza | MAX796 | |
| Descripción | Step-Down Controllers with Synchronous Rectifier for CPU Power | |
| Fabricantes | Maxim Integrated | |
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19-0221; Rev 3a; 11/97
EVAFLOULALTOIWONDKAITTAMSAHNEUEATLS
Step-Down Controllers with
Synchronous Rectifier for CPU Power
_______________General Description
The MAX796/MAX797/MAX799 high-performance, step-
down DC-DC converters with single or dual outputs
provide main CPU power in battery-powered systems.
These buck controllers achieve 96% efficiency by using
synchronous rectification and Maxim’s proprietary Idle
Mode™ control scheme to extend battery life at full-load
(up to 10A) and no-load outputs. Excellent dynamic
response corrects output transients caused by the latest
dynamic-clock CPUs within five 300kHz clock cycles.
Unique bootstrap circuitry drives inexpensive N-channel
MOSFETs, reducing system cost and eliminating the
crowbar switching currents found in some PMOS/NMOS
switch designs.
The MAX796/MAX799 are specially equipped with a sec-
ondary feedback input (SECFB) for transformer-based
dual-output applications. This secondary feedback path
improves cross-regulation of positive (MAX796) or nega-
tive (MAX799) auxiliary outputs.
The MAX797 has a logic-controlled and synchronizable
fixed-frequency pulse-width-modulating (PWM) operating
mode, which reduces noise and RF interference in sensi-
tive mobile-communications and pen-entry applications.
The SKIP override input allows automatic switchover to
idle-mode operation (for high-efficiency pulse skipping) at
light loads, or forces fixed-frequency mode for lowest noise
at all loads.
The MAX796/MAX797/MAX799 are all available in 16-
pin DIP and narrow SO packages. See the table below
to compare these three converters.
PART
MAX796
MAX797
MAX799
MAIN OUTPUT
SPECIAL FEATURE
3.3V/5V or adj.
Regulates positive secondary
voltage (such as +12V)
3.3V/5V or adj. Logic-controlled low-noise mode
3.3V/5V or adj.
Regulates negative secondary
voltage (such as -5V)
________________________Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Cellular Phones
____________________________Features
o 96% Efficiency
o 4.5V to 30V Input Range
o 2.5V to 6V Adjustable Output
o Preset 3.3V and 5V Outputs (at up to 10A)
o Multiple Regulated Outputs
o +5V Linear-Regulator Output
o Precision 2.505V Reference Output
o Automatic Bootstrap Circuit
o 150kHz/300kHz Fixed-Frequency PWM Operation
o Programmable Soft-Start
o 375µA Typ Quiescent Current (VIN = 12V, VOUT = 5V)
o 1µA Typ Shutdown Current
______________Ordering Information
PART†
MAX796CPE
MAX796CSE
MAX796C/D
MAX796EPE
MAX796ESE
MAX796MJE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
Dice*
16 Plastic DIP
16 Narrow SO
16 CERDIP
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
__________________Pin Configuration
TOP VIEW
SS 1
(SECFB) SKIP 2
REF 3
GND 4
SYNC 5
SHDN 6
FB 7
CSH 8
MAX796
MAX797
MAX799
16 DH
15 LX
14 BST
13 DL
12 PGND
11 VL
10 V+
9 CSL
Idle Mode is a trademark of Maxim Integrated Products.
†U.S. and foreign patents pending.
( ) ARE FOR MAX796/MAX799.
DIP/SO
________________________________________________________________ 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.
1 page  
Step-Down Controllers with
Synchronous Rectifier for CPU Power
__________________________________________________Typical Operating Circuits
INPUT
4.5V TO 30V
V+
SHDN
VL
MAX797
DH
BST
SS LX
REF DL
PGND
SYNC
GND
SKIP
CSH
CSL
FB
+3.3V
OUTPUT
INPUT
6V TO 30V
V+
SECFB
SHDN
FB
VL
MAX796
DH
BST
LX
DL
SS PGND
REF CSH
GND
SYNC
CSL
+12V
OUTPUT
+5V
OUTPUT
_______________________________________________________________________________________ 5
5 Page 
Step-Down Controllers with
Synchronous Rectifier for CPU Power
Table 1. Component Selection for Standard 3.3V Applications
COMPONENT
1A
LOAD CURRENT
2A 3A 4A
10A
Input Range 4.75V to 18V
4.75V to 18V
4.75V to 28V
4.75V to 24V
4.5V to 6V
Application
PDA
Sub-Notebook
Notebook
High-End Notebook Desktop 5V-to-3V
Frequency
150kHz
300kHz
300kHz
300kHz
300kHz
Q1 High-Side
MOSFET
International Rectifier
1/2 IRF7101
Motorola 1/2
MMDF3N03HD or 1/2
Si9936
Motorola
MMSF5N03HD or
Si9410
Motorola
MTD20N03HDL
DPAK
Motorola
MTD75N03HDL
D2PAK
Q2 Low-Side
MOSFET
International Rectifier
1/2 IRF7101
Motorola 1/2
MMDF3N03HD or 1/2
Si9936
Motorola
MMSF5N03HD or
Si9410
Motorola
MTD20N03HDL
DPAK
Motorola
MTD75N03HDL
D2PAK
C1 Input
Capacitor
22µF, 35V AVX TPS
or Sprague 595D
2 x 22µF, 35V AVX
TPS or Sprague 595D
2 x 22µF, 35V AVX
TPS or Sprague 595D
4 x 22µF, 35V AVX
TPS or Sprague 595D
2 x 220µF, 10V
Sanyo OS-CON
10SA220M
C2 Output
Capacitor
150µF, 10V AVX TPS 150µF, 10V AVX TPS
or Sprague 595D or Sprague 595D
220µF, 10V AVX TPS
or Sprague 595D
3 x 220µF, 10V AVX
TPS or Sprague 595D
4 x 220µF, 10V
Sanyo OS-CON
10SA220M
D1 Rectifier
1N5817 Motorola
MBR0502L SOD-89
1N5817 NIEC
EC10QS02L or
Motorola MBRS130T3
1N5819 NIEC
1N5821 NIEC
1N5820 NIEC
EC10QS03 or
NSQ03A04 or
NSQ03A02, or
Motorola MBRS130T3 Motorola MBRS340T3 Motorola MBRS340T3
R1 Resistor
0.062Ω IRC
LR2010-01-R062
0.039Ω IRC
LR2010-01-R039
0.025Ω IRC
LR2010-01-R025
0.015Ω IRC
LR2010-01-015
3 x 0.02Ω IRC
LR2010-01-R020
(3 in parallel)
L1 Inductor
47µH, 1.2A Ferrite or
Kool-Mu
Sumida CD75-470
33µH, 2.2A Ferrite
Dale LPE6562-330MB
10µH, 3A Ferrite
Sumida CDRH125
4.7µH, 5.5A Ferrite
Coilcraft DO3316-472
1.5µH, 11A, 3.5mΩ
Coiltronics
CTX03-12357-1
Table 2. Component Suppliers
MANUFACTURER
USA PHONE
FACTORY FAX
[Country Code]
AVX
Central Semiconductor
(803) 946-0690 [1] 803-626-3123
(516) 435-1110 [1] 516-435-1824
Coilcraft
(847) 639-6400 [1] 847-639-1469
Coiltronics
(561) 241-7876 [1] 561-241-9339
Dale
(605) 668-4131 [1] 605-665-1627
International Rectifier
IRC
(310) 322-3331 [1] 310-322-3332
(512) 992-7900 [1] 512-992-3377
Kemet
(864) 963-6300 [1] 864-963-6521
Matsuo
(714) 969-2491 [1] 714-960-6492
Motorola
(602) 303-5454 [1] 602-994-6430
* Distributor
losses due to MOSFET gate charge. The step-down
power-switching circuit consists of two N-channel
MOSFETs, a rectifier, and an LC output filter. The out-
put voltage is the average of the AC voltage at the
switching node, which is adjusted and regulated by
changing the duty cycle of the MOSFET switches. The
MANUFACTURER
USA PHONE
FACTORY FAX
[Country Code]
Murata-Erie
(814) 237-1431
(800) 831-9172
[1] 814-238-0490
NIEC
(805) 867-2555* [81] 3-3494-7414
Sanyo
(619) 661-6835 [81] 7-2070-1174
Siliconix
(408) 988-8000
(800) 554-5565
[1] 408-970-3950
Sprague
(603) 224-1961 [1] 603-224-1430
Sumida
(847) 956-0666 [81] 3-3607-5144
TDK (847) 390-4461 {1} 847-390-4405
Transpower Technologies (702) 831-0140 [1] 702-831-3521
gate-drive signal to the N-channel high-side MOSFET
must exceed the battery voltage and is provided by a
flying capacitor boost circuit that uses a 100nF capaci-
tor connected to BST.
The MAX796 contains nine major circuit blocks, which
are shown in Figure 2.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX796.PDF ] | |
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