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PDF MAX1954A Data sheet ( Hoja de datos )
| Número de pieza | MAX1954A | |
| Descripción | Current-Mode PWM Buck Controller | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-3154; Rev 1; 5/05
EVAALVUAAILTAIOBNLEKIT
Low-Cost, Current-Mode PWM Buck
Controller with Foldback Current Limit
General Description
The MAX1954A synchronous current-mode, pulse-
width modulation (PWM) buck controller is pin compati-
ble with the popular MAX1954 and is suitable for
applications where cost and size are critical.
The MAX1954A operates from an input voltage range of
3.0V to 13.2V, independent of the IC supply. The output
voltage is adjustable down to 0.8V. The IC operates at
a fixed 300kHz switching frequency and provides up to
25A of output current with efficiency up to 95%. This
controller has excellent transient response resulting in
smaller output capacitance.
The MAX1954A features foldback current limiting that
greatly reduces input current and component power
dissipation during output overload or short-circuit
conditions.
The compensation and shutdown control (COMP) input,
in addition to providing compensation to the error
amplifier, can be pulled low to shut down the converter.
An input undervoltage lockout is provided to ensure
proper operation during power sags to prevent the
external power MOSFETs from overheating. Internal
digital soft-start is included to reduce inrush current
and save an external capacitor.
The MAX1954A is available in a tiny 10-pin µMAX®
package to minimize PC board space.
Applications
Printers and Scanners
Graphic Cards and Video Cards
PCs and Servers
Microprocessor Cores
Low-Voltage Distributed Power
Telecom/Networks
Features
♦ Current-Mode Controller
♦ Fixed-Frequency PWM
♦ Foldback Current Limit
♦ Output Down to 0.8V with ±1% FB Accuracy
♦ 3.0V to 13.2V Input Voltage
♦ 300kHz Switching Frequency
♦ 25A Output-Current Capability
♦ 93% Efficiency
♦ All-N-Channel-MOSFET Design for Low Cost
♦ No Current-Sense Resistor Needed
♦ Internal Digital Soft-Start
♦ Small 10-Pin µMAX Package
Ordering Information
PART
TEMP RANGE
MAX1954AEUB
-40°C to +85°C
MAX1954AEUB+
-40°C to +85°C
+Denotes lead-free package.
PIN-PACKAGE
10 µMAX
10 µMAX
Pin Configuration
TOP VIEW
µMAX is a registered trademark of Maxim Integrated Products, Inc.
HSD 1
COMP 2
FB 3
GND 4
IN 5
MAX1954A
10 BST
9 LX
8 DH
7 PGND
6 DL
µMAX
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Low-Cost, Current-Mode PWM Buck
Controller with Foldback Current Limit
(TA = +25°C, unless otherwise noted.)
EFFICIENCY
vs. LOAD CURRENT
100
VOUT = 2.5V
90
80
VOUT = 1.5V
70
60
50
40
0.1
VIN = VHSD = 5V
1
LOAD CURRENT (A)
10
2.60
2.55
2.50
2.45
2.40
0
Typical Operating Characteristics
OUTPUT VOLTAGE
vs. LOAD CURRENT
VIN = VHSD = 5V
1234
LOAD CURRENT (A)
5
70
50
30
10
-10
-30
-50
-70
3.0
OUTPUT VOLTAGE CHANGE
vs. INPUT VOLTAGE
VOUT = 2.5V
VOUT = 0.8V
VIN = VHSD
IOUT = 5A
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
0.81
0.81
0.80
0.80
0.79
10.8
VIN = VHSD
IOUT = 5A
11.4 12.0 12.6
INPUT VOLTAGE (V)
13.2
OSCILLATOR FREQUENCY
vs. INPUT VOLTAGE
350
330 TA = -40°C
310
VOUT
AC-COUPLED
290
270
250
3.0
TA = +85°C TA = +25°C
VIN = VHSD
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
IOUT
5A/µs
LOAD TRANSIENT
MAX1954A toc06
100mV/div
40µs/div
5A
500mA
_______________________________________________________________________________________ 5
5 Page 
Low-Cost, Current-Mode PWM Buck
Controller with Foldback Current Limit
Table 1. Suggested Components
PART DESIGNATOR
C1
C2
C3
MAX1954A
(FIGURE 1)
0.22µF, 10V X7R ceramic capacitor
Kemet C0603C224M8RAC
1µF, 6.3V X5R ceramic capacitor
Taiyo Yuden JMK212BJ106MG
10µF, 16V X5R ceramic capacitor
Taiyo Yuden EMK325BJ106MN
C4 0.1µF, 6.3V X7R ceramic capacitor
C5 180µF, 4V SP polymer capacitor
Panasonic EEFUEOG181R
C6 1500pF, 50V X7R ceramic capacitor
TDK C1608X7R1H152K
C7 —
C8 —
C9–C13
Cc
CF
R1
R2
R3
RC
D1
N1, N2
N3, N4
L1
—
680pF, 10V X7R ceramic capacitor
Kemet C0402C681M8RAC
—
16.9kΩ ±1% resistor
8.06kΩ ±1% resistor
2Ω ±5% resistor
62kΩ ±5% resistor
Schottky diode
Central Semiconductor CMPSH1-4
20V, 5A dual MOSFETs
Fairchild FDS6898A
—
1µH, 3.6A inductor
TOKO 817FY-1R0M
20A CIRCUIT
(FIGURE 2)
0.22µF, 10V X7R ceramic capacitor
Kemet C0603C224M8RAC
10µF, 16V X5R ceramic capacitor
Taiyo Yuden EMK325BJ106MN
10µF, 16V X5R ceramic capacitor
Taiyo Yuden EMK325BJ106MN
10µF, 16V X5R ceramic capacitor
Taiyo Yuden EMK325BJ106MN
10µF, 16V X5R ceramic capacitor
Taiyo Yuden EMK325BJ106MN
10µF, 16V X5R ceramic capacitor
Taiyo Yuden EMK325BJ106MN
0.1µF, 50V X7R ceramic capacitor
Taiyo Yuden UMK107BJ104KA
270µF, 2V SP polymer capacitor
Panasonic EEFUEOD271R
270µF, 2V SP polymer capacitors
Panasonic EEFUEOD271R
560pF, 10V X7R ceramic capacitor
Kemet C0402C561M8RAC
15pF, 10V C0G ceramic capacitor
Kemet C0402C150K8GAC
10kΩ ±1% resistor
8.06kΩ ±1% resistor
—
270kΩ ±5% resistor
Schottky diode
Central Semiconductor CMPSH1-4
30V N-channel MOSFETs
International Rectifier IRF7811
30V N-channel MOSFETs
Siliconix Si4842DY
0.8µH, 27.5A inductor
Sumida CEP125U-0R8
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MAX1954A.PDF ] | |
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