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NCP1530 PDF даташит

Спецификация NCP1530 изготовлена ​​​​«ON» и имеет функцию, называемую «600 mA PWM/PFM Step-Down Converter with External Synchronization Pin».

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Номер произв NCP1530
Описание 600 mA PWM/PFM Step-Down Converter with External Synchronization Pin
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NCP1530 Даташит, Описание, Даташиты
NCP1530
600 mA PWM/PFM
Step−Down Converter with
External Synchronization Pin
The NCP1530 is a PWM/PFM non−synchronous step−down
(Buck) DC−DC converter for usage in systems supplied from 1−cell
Li−ion, or 2 or more cells Alkaline/NiCd/NiMH batteries. It can
operate in Constant−Frequency PWM mode or PWM/PFM mode in
which the controller will automatically switch to PFM mode
operation at low output loads to maintain high efficiency. The
switching frequency can also be synchronized to external clock
between 600 kHz and 1.2 MHz. The maximum output current is up
to 600 mA. Applying an external synchronizing signal to SYN pin
can supersede the PFM operation.
The NCP1530 consumes only 47 mA (typ) of supply current
(VOUT = 3.0 V, no switching) and can be forced to shutdown mode by
bringing the enable input (EN) low. In shutdown mode, the regulator
is disabled and the shutdown supply current is reduced to
0.5 mA (typ). Other features include built−in undervoltage lockout,
internal thermal shutdown, an externally programmable soft−start
time and output current limit protection. The NCP1530 operates
from a maximum input voltage of 5.0 V and is available in a space
saving, low profile Micro8package.
Features
Pb−Free Package is Available
High Conversion Efficiency, up to 92% at VIN = 4.3 V,
VOUT = 3.3 V, IOUT = 300 mA
Current−Mode PWM Control
Automatic PWM/PFM Mode for Current Saving at Low Output Loads
Internal Switching Transistor Support 600 mA Output Current
(VIN = 5.0 V, VOUT = 3.3 V)
High Switching Frequency (600 kHz), Support Small Size Inductor
and Capacitor, Ceramic Capacitors Can be Used
Synchronize to External Clock Signal up to 1.2 MHz
100% Duty Cycle for Maximum Utilization of the Supply Source
Programmable Soft−Start Time through External Chip Capacitor
Externally Accessible Voltage Reference
Built−In Input Undervoltage Lockout
Built−In Output Overvoltage Protection
Power Saving Shutdown Mode
Space Saving, Low Profile Micro8 Package
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8
1
MARKING
DIAGRAM
Micro8]
DM SUFFIX
CASE 846A
xxxx
ALYW
xxxx = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
PIN CONNECTIONS
VIN
SYN
SS
GND
1
2
3
4
(Top View)
8 LX
7 VREF
6 VOUT
5 EN
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
Typical Applications
PDAs
Digital Still Camera
Cellular Phone and Radios
Portable Test Equipment
Portable Scanners
Portable Audio Systems
© Semiconductor Components Industries, LLC, 2004
November, 2004 − Rev. 3
1
Publication Order Number:
NCP1530/D









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NCP1530 Даташит, Описание, Даташиты
VIN = 2.8 V to 5.0 V
CIN
22 mF
NCP1530
VIN LX
*CSS
SYN
NCP1530
VOUT
SS VREF
GND
EN
L1 5.6 mH
D1
MBRM120ET3
*CVREF
1.0 mF
COUT
22 mF
VOUT = 3.0 V
*Optional Component
Figure 1. Typical Step−Down Converter Application
EN 5
SYN 2
SS 3
VREF 7
ENABLE
DETECT
SYNC
DETECT
AND
TIMING
BLOCK
THERMAL
SHUTDOWN
UVLO
MASTER ENABLE
ISEN
MODE
SELECTION
MODE
ISEN
ILIMIT
ISEN
ISEN
FB
50 nA
VOLTAGE
REFERENCE
AND
SOFT−START
10 pF
+
0.04
VREF
OTA
+
VREF
DRV
OV
+
CONTROL
LOGIC
+
+
VIN 1
8 LX
6 VOUT
FB
4 GND
Figure 2. Simplified Functional Block Diagram
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NCP1530 Даташит, Описание, Даташиты
NCP1530
PIN FUNCTION DESCRIPTIONS
Pin Symbol
Description
1 VIN Unregulated Supply Input.
2
SYN
Oscillator Synchronization and Mode Selection Input.
SYNC = GND (Automatic PWM/PFM mode) The converter operates at 600 kHz fixed−frequency PWM mode
primarily, and automatically switches to variable−frequency PFM mode at small output loads for power saving.
SYNC = VIN (Constant−Frequency PWM mode) The converter operates at 600 kHz fixed−frequency PWM mode
always.
SYNC = External clock signal between 600 to 1200 kHz. The converter will be synchronized with the external
clock signal.
The SYNC pin is internally pulled to GND.
3 SS Soft−Start Timing control pin. An external soft−start capacitor can be connected to this pin if extended soft−start is
required. A 50 nA current will be sourced from this pin to charge up the capacitor during startup and gently ramps
the device into service to prevent output voltage overshoot. If this pin is floated, built−in 500 ms (typ.) soft−start
will be activated.
4
GND
Ground Terminal.
5 EN Active−High Enable Input. Active to enable the device. Bring this pin to GND and the quiescent current is reduced
to less than 0.5 mA. This pin is internally pulled to VIN.
6
VOUT
Feedback Terminal. The output voltage is sensed by this pin.
7
VREF
Connected to voltage reference decoupling capacitor. For noise non−sensitive applications, the internal voltage
reference can operate without decoupling capacitor.
8 LX Inductor Terminal. This pin is connected to the drains of the internal P−channel switching transistors. The inductor
must be connected between this pin and the output terminal.
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply (Pin 1)
Input/Output Pins (Pins 2−4 & Pins 7−8)
Thermal Characteristics
Micro8 Plastic Package
Thermal Resistance, Junction−to−Air
VIN
VIO
RqJA
−0.3 to 6
−0.3 to 6
240
V
V
°C/W
Operating Junction Temperature Range
TJ
0 to +150
°C
Operating Ambient Temperature Range
TA
0 to +85
°C
Storage Temperature Range
Tstg
−55 to +150
°C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values
(not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage
may occur and reliability may be affected.
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model (HBM) "2.0 kV per JEDEC standard: JESD22−A114.
Machine Model (MM) "200 V per JEDEC standard: JESD22−A115.
2. Latchup Current Maximum Rating: "150 mA per JEDEC standard: JESD78.
3. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J−STD−020A.
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