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PDF LTC3546 Data sheet ( Hoja de datos )
| Número de pieza | LTC3546 | |
| Descripción | 3A/1A or 2A/2A Configurable Step-Down DC/DC Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC3546 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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LTC3546
Dual Synchronous, 3A/1A
or 2A/2A Configurable
Step-Down DC/DC Regulator
FEATURES
n VIN Range: 2.25V to 5.5V
n VOUT Range: 0.6V to 5V
n Programmable Frequency Operation; 2.25MHz, or
Adjustable Between 0.75MHz to 4MHz
n Low RDS(ON) Internal Switches
wwwn.DaHtiagShheEeftfi4cUi.econmcy: Up to 96%
n No Schottky Diodes Required
n Short-Circuit Protected
n Current Mode Operation for Excellent Line and Load
Transient Response
n Low Ripple Burst Mode Operation (30mVP-P),
IQ = 160μA
n Ultralow Shutdown Current: IQ < 1μA
n Low Dropout Operation: 100% Duty Cycle
n Power Good Output For Each Channel
n Externally or Internally Programmable Burst Level
n External or Internal Soft-Start or Supply Tracking
n Available in Thermally Enhanced 28-Lead
(4mm × 5mm) QFN and TSSOP Packages
APPLICATIONS
n Netbooks/Ultra-Mobile PCs
n PC Cards
n Wireless and DSL Modems
n Point of Load DC/DC Conversion
DESCRIPTION
The LTC®3546 is a dual, constant-frequency, synchronous
step down DC/DC converter for medium power applications.
The design consists of 2A and 1A primary output switches.
In addition to the 2A/1A capability, a 1A dependant output
switch can be externally connected to either of the primary
outputs to produce 3A/1A dual regulator or 2A/2A dual
regulator configurations.
Supply operation is from 2.25V to 5.5V. The switching
frequency can be set to 2.25MHz, adjustable 0.75MHz to
4MHz, or synchronized to an external clock. Each output
is adjustable from 0.6V to 5V and has output tracking
on power-up. Internal synchronous low RDS(ON) power
switches provide high efficiency without external Schottky
diodes.
User-selectable modes (Burst Mode® operation, pulse
skipping and forced continuous) allow trade-off between
ripple noise and power efficiency. Burst Mode operation
provides high efficiency at light loads. Pulse-skipping
mode provides low ripple noise at light loads.
The device is capable of low dropout configurations and
both channels can operate at 100% duty cycle. In shut-
down, the device draws <1μA.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258.
TYPICAL APPLICATION
VIN
2.25V TO
5.5V
VOUT2
2.5V, 3A
68μF
CIN
22μF
0.56μH
100pF
95.3k
VIN
30.1k VIN
13k
10pF
1000pF
VIN1 VCCA VCCD VIN2
SYNC/MODE
PGOOD2
PGOOD1
SW2A
SW1
SW2B
SW1D
RUN2
VFB2
BMC2
LTC3546
RUN1
VFB1
BMC1
TRACK/SS2 TRACK/SS1
PHASE
FREQ
ITH2 ITH1
PGND2 GNDA PGND1
EXPOSED PAD
1.22μH
100pF
VIN
VIN
30.1k
30.1k
VOUT1
1.2V, 1A
22μF
13k
1000pF
10pF
3546 TA01a
VOUT2 Efficiency (Burst Mode Operation)
100
SW1D CONNECTED TO SW2
VIN = 3.6V
95 VOUT = 2.5V
100
10
90 EFFICIENCY
85
1
0.1
80 0.01
POWER LOSS
75 0.001
70
0.001
0.01 0.1
1
LOAD CURRENT (A)
0.0001
10
3546 TA01b
3546fb
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
OUT1 Burst Mode Operation
OUT1 Pulse-Skipping Mode
Operation
LTC3546
OUT1 Forced Continuous Mode
Operation
VOUT
20mV/DIV
VOUT
20mV/DIV
VOUT
20mV/DIV
ILOAD
500mA/DIV
www.DataSheet4U.com
2μs/DIV
SW1D CONNECTED TO SW1
VIN = 3.6V
VOUT = 1.8V
ILOAD = 300mA
ILOAD
250mA/DIV
3546 G02
1μs/DIV
SW1D CONNECTED TO SW1
VIN = 3.6V
VOUT = 1.2V
ILOAD = 100mA
ILOAD
250mA/DIV
3546 G03
1μs/DIV
SW1D CONNECTED TO SW1
VIN = 3.6V
VOUT = 1.2V
ILOAD = 100mA
3546 G04
OUT1 Burst Mode Operation
OUT1 Pulse-Skipping Mode
Operation
OUT1 Forced Continuous Mode
Operation
VOUT
20mV/DIV
ILOAD
200mA/DIV
1μs/DIV
SW1D CONNECTED TO SW2
VIN = 3.6V
VOUT = 1.8V
ILOAD = 200mA
VOUT
20mV/DIV
ILOAD
250mA/DIV
3546 G05
1μs/DIV
SW1D CONNECTED TO SW2
VIN = 3.6V
VOUT = 1.2V
ILOAD = 100mA
VOUT
20mV/DIV
ILOAD
250mA/DIV
3546 G06
1μs/DIV
SW1D CONNECTED TO SW2
VIN = 3.6V
VOUT = 1.2V
ILOAD = 50mA
3546 G07
OUT2 Burst Mode Operation
OUT2 Pulse-Skipping Mode
Operation
OUT2 Forced Continuous Mode
Operation
VOUT
20mV/DIV
ILOAD
500mA/DIV
1μs/DIV
SW1D CONNECTED TO SW2
VIN = 3.6V
VOUT = 2.5V
ILOAD = 500mA
VOUT
20mV/DIV
ILOAD
500mA/DIV
3546 G08
1μs/DIV
SW1D CONNECTED TO SW2
VIN = 3.6V
VOUT = 1.8V
ILOAD = 200mA
VOUT
20mV/DIV
ILOAD
500mA/DIV
3546 G09
1μs/DIV
SW1D CONNECTED TO SW2
VIN = 3.6V
VOUT = 1.8V
ILOAD = 100mA
3546 G10
3546fb
5
5 Page 
FUNCTIONAL DIAGRAM
ITH1
+
VFB1 –
–
VB +
0.552V +
–
www.DataSheet4U.com
+
0.63V –
RUN1
VCCA
TRACK/SS1
INTERNAL
1.15μA SOFT-START
VOLTAGE
REFERENCE
SYNC/MODE
MUX
VCCA
GNDA
VCCD
DEPENDENT SWITCH
AUTO DETECT AND CONTROL
GNDD
VCCA
TRACK/SS2
1.15μA
INTERNAL
SOFT-START
RUN2
MUX
0.63V –
+
–
0.552V +
VFB2 VB +
–
–
+
ITH2
LTC3546
BMC1
ITH LIMIT
1A REGULATOR VIN1
+
–
SLOPE
COMPENSATION
ANTI-SHOOT
THRU
SW1
LOGIC
+
–
–
PGND1
+
PGOOD1
OSCILLATOR
PHASE
FREQ
MUX
1A DEPENDENT
SWITCHES
ANTI-SHOOT
THRU
VIN1D
SW1D
PGND1D
PGOOD2
LOGIC
ITH LIMIT
BMC2
PGND2
+
–
–
+
ANTI-SHOOT
THRU
SLOPE
COMPENSATION
–
+
2A REGULATOR VIN2
SW2A
SW2B
3546 BD
3546fb
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTC3546.PDF ] | |
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