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PDF MAX1565 Data sheet ( Hoja de datos )
| Número de pieza | MAX1565 | |
| Descripción | Small / High-Efficiency / Five-Channel Digital Still Camera Power Supply | |
| Fabricantes | Maxim Integrated | |
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Hay una vista previa y un enlace de descarga de MAX1565 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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19-2712; Rev 0; 1/03
EVAALVUAAILTAIOBNLEKIT
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
General Description
The MAX1565 provides a complete power-supply solution
for digital still and video cameras through the integration
of ultra-high-efficiency step-up/step-down DC-to-DC con-
verters along with three auxiliary step-up controllers. The
MAX1565 is targeted for applications that use either 2 or
3 alkaline or NiMH batteries as well as those using a
single lithium-ion (Li+) battery.
The step-up DC-to-DC converter accepts inputs from
0.7V to 5.5V and regulates a resistor-adjustable output
from 2.7V to 5.5V. It uses internal MOSFETs to achieve
95% efficiency. Adjustable operating frequency facili-
tates design for optimum size, cost, and efficiency.
The step-down DC-to-DC converter can produce output
voltages as low as 1.25V and also utilizes internal
MOSFETs to achieve 95% efficiency. An internal soft-
start ramp minimizes surge current from the battery.
The converter can operate from the step-up output pro-
viding buck-boost capability with up to 90% compound
efficiency, or it can run directly from the battery if buck-
boost operation is not needed.
The MAX1565 features auxiliary step-up controllers that
power CCD, LCD, motor actuator, and backlight cir-
cuits. The device also features low-cost expandability
by supplying power, an oscillator signal, and a refer-
ence to the MAX1801 SOT23 slave controller that sup-
ports step-up, SEPIC, and flyback configurations.
The MAX1565 is available in a space-saving 32-pin thin
QFN package.
Applications
Digital Still Cameras
Digital Video Cameras
PDAs
Typical Operating Circuit
INPUT
+0.7V TO +5.5V
MAX1565
STEP-UP
STEP-DOWN
ON/OFF
CONTROLS
ONSU
ONSD
ON1
ON2
0N3
AUX1
AUX2
AUX3
MAIN +3.3V
CORE +1.5V
MOTOR +5V
CCD +15V/-7.5V
LCD, LED +15V
Features
o Step-Up DC-to-DC Converter
95% Efficient
3.3V (Fixed) or 2.7V to 5.5V (Adjustable) Output
Voltage
o Step-Down DC-to-DC Converter
Operate from Battery for 95% Efficient Buck
Combine with Step-Up for 90% Efficient Buck-
Boost
Adjustable Output Down to 1.25V
o Three Auxiliary PWM Controllers
o Up to 1MHz Operating Frequency
o 1µA Shutdown Mode
o Internal Soft-Start Control
o Overload Protection
o Compact 32-Pin, 5mm x 5mm Thin QFN Package
PART
MAX1565ETJ
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
32 Thin QFN
TOP VIEW
Pin Configuration
COMP1 1
FB1 2
PGNDA 3
LXSD 4
INSD 5
ONSD 6
COMPSD 7
FBSD 8
32 31 30 29 28 27 26 25
24 COMP3
23 SDOK
22 OUTSUA
MAX1565
21 LXSU
20 PGNDB
19 OSC
18 FBSEL1
17 FBSELSD
9 10 11 12 13 14 15 16
5mm x 5mm
THIN QFN
________________________________________________________________ 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  
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
ELECTRICAL CHARACTERISTICS (continued)
(VOUTSU = 3.3V, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER
Reference Line Regulation
CONDITIONS
2.7V < OUTSU < 5.5V
OSC Discharge Trip Level
Rising edge
OSC Discharge Resistance
OSC = 1.5V, IOSC = 3mA
STEP-UP DC-TO-DC CONVERTER
Step-Up Startup-to-Normal
Operating Threshold
Rising or falling edge (Note 4)
Step-Up Voltage Adjust Range
FBSU Regulation Voltage
OUTSU Regulation Voltage
FBSELSU = GND
FBSU to COMPSU
Transconductance
FBSU = COMPSU
FBSU Input Leakage Current
Idle-Mode Trip Level
Step-Up Maximum Duty Cycle
FBSU = 1.25V
(Note 6)
FBSU =1V
OUTSU Leakage Current
LXSU Leakage Current
Switch On-Resistance
VLX = 0V, OUTSU = 5.5V
VLXSU = VOUT = 5.5V
N-channel
P-channel
N-Channel Current limit
STEP-DOWN DC-TO-DC CONVERTER
FBSD Regulation Voltage
OUTSD Regulation Voltage
FBSELSD = GND
FBSD to COMPSD
Transconductance
FBSD = COMPSD
FBSD Input Leakage Current
FBSD = 1.25V
Idle-Mode Trip Level
LXSD Leakage Current
Switch On-Resistance
P-Channel Current Limit
(Note 6)
VLXSD = 5.5V, OUTSU = 5.5V
VLXSD = 0V, OUTSU = 5.5V
N-channel
P-channel
SDOK Output Low Voltage
FBSD = 0.4V; 0.1mA into SDOK pin
SDOK Operating Voltage Range
AUXILIARY DC-TO-DC CONTROLLERS (AUX 1, 2, AND 3)
Maximum Duty Cycle
FB_ = 1V
FB_ Regulation Voltage
FB_ = COMP_
MIN
1.225
TYP
MAX
5
1.275
80
UNITS
mV
V
Ω
2.30
2.7
1.225
3.283
80
-100
150
80
1.6
1.225
1.47
80
-100
110
0.7
1
80
1.225
2.60
5.5
1.275
3.417
185
+100
275
90
20
20
150
250
2.4
V
V
V
V
µS
nA
mA
%
µA
µA
mΩ
A
1.275
1.53
185
+100
195
20
20
150
250
1.0
0.1
5.5
V
V
µS
nA
mA
µA
mΩ
A
V
V
90
1.275
%
V
_______________________________________________________________________________________ 5
5 Page 
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
Pin Description (continued)
PIN NAME
FUNCTION
24
COMP3
Auxiliary Controller 3 Compensation Node. Connect a series resistor-capacitor from COMP3 to GND to
compensate the control loop. COMP3 is actively driven to GND in shutdown and thermal limit.
25 FB3 Auxiliary Controller 3 Feedback Input. Connect a resistive voltage-divider from the output voltage to FB3 to
GND. The FB3 feedback threshold is 1.25V. This pin is high impedance in shutdown.
26
OUTSUB
Step-Up Converter Output. OUTSUB powers the MAX1565 and is the sense input when FBSELSU is GND
and the output is 3.3V. Connect OUTSUA to OUTSUB.
27
DL3
Auxiliary Controller 3 Gate-Drive Output. Connect the gate of an N-channel MOSFET to DL3. DL3 swings
from GND to OUTSU and supplies up to 500mA. DL3 is driven to GND in shutdown and thermal limit.
28
DL2
Auxiliary Controller 2 Gate-Drive Output. Connect the gate of an N-channel MOSFET to DL2. DL2 swings
from GND to OUTSU and supplies up to 500mA. DL2 is driven to GND in shutdown and thermal limit.
29
DL1
Auxiliary Controller 1 Gate-Drive Output. Connect the gate of an N-channel MOSFET to DL1. DL1 swings
from GND to OUTSU and supplies up to 500mA. DL1 is driven to GND in shutdown and thermal limit.
30 GND Quiet Ground. Connect GND to PGND as close to the IC as possible.
31 COMP2 Auxiliary Controller 2 Compensation Node. Connect a series resistor-capacitor from COMP2 to GND to
compensate the control loop. COMP2 is actively driven to GND in shutdown and thermal limit.
Auxiliary Controller 2 Feedback Input. Connect a resistive voltage-divider from the output voltage to FB2 to
32 FB2 GND to set the output voltage. The FB2 feedback threshold is 1.25V. This pin is high impedance in
shutdown.
Exposed
Pad
EP
Exposed Underside Metal Pad. This pad must be soldered to the PC board to achieve package thermal and
mechanical ratings. The exposed pad is electrically connected to GND.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet MAX1565.PDF ] | |
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