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LM25088 데이터시트(PDF) 4 Page - Texas Instruments

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부품명 LM25088
상세설명  LM25088, LM25088-Q1 Wide Input Range Non-Synchronous Buck Controller
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LM25088, LM25088-Q1
SNVS609J – DECEMBER 2008 – REVISED JANUARY 2015
www.ti.com
Pin Functions
PIN
DESCRIPTION
APPLICATION INFORMATION
NUMBER
NAME
1
VIN
Input supply voltage
IC supply voltage. The operating range is 4.5V to 42V.
If the EN pin voltage is below 0.4V the regulator will be in a low power
state. If the EN pin voltage is between 0.4V and 1.2V the controller will be
in standby mode. If the EN pin voltage is above 1.2V the controller will be
2
EN
Enable input
operational. An external voltage divider can be used to set a line under
voltage shutdown threshold. If the EN pin is left open, a 5µA pull-up
current forces the pin to the high state and enables the controller.
When SS is below the internal 1.2V reference, the SS voltage will control
the error amplifier. An internal 11 µA current source charges an external
capacitor to set the start-up rate of the controller. The SS pin is held low in
3
SS
Soft-start
the standby, VCC UV and thermal shutdown states. The SS pin can be
used for voltage tracking by connecting this pin to a master voltage supply
less than 1.2V. The applied voltage will act as the reference for the error
amplifier.
An external capacitor connected between this pin and the GND pin sets
the ramp slope used for emulated current mode control. Recommended
4
RAMP
Ramp control signal
capacitor range 100 pF to 2000 pF. See the Application and
Implementation section for selection of capacitor value.
The internal oscillator is programmed with a single resistor between this
pin and the GND pin. The recommended frequency range is 50 kHz to 1
Internal oscillator
MHz. An external synchronization signal, which is higher in frequency than
5
RT/SYNC
frequency set input and
the programmed frequency, can be applied to this pin through a small
synchronization input
coupling capacitor. The RT resistor to ground is required even when using
external synchronization.
6
GND
Ground
Ground return.
Output of the internal error The loop compensation network should be connected between this pin
7
COMP
amplifier
and the FB pin.
Feedback signal from the
This pin is connected to the inverting input of the internal error amplifier.
8
FB
regulated output
The regulation threshold is 1.205V.
9
OUT
Output voltage connection Connect directly to the regulated output voltage.
A capacitor connected between DITH pin and GND is charged and
discharged by 27 µA current sources. As the voltage on the DITH pin
Frequency Dithering
10
DITH
ramps up and down, the oscillator frequency is modulated between -5% to
(LM25088-1 Only)
+5% of the nominal frequency set by the RT resistor. Grounding the DITH
pin will disable the frequency dithering mode.
The RES pin is normally connected to an external capacitor that sets the
timing for hiccup mode current limiting. In normal operation, a 25 µA
current source discharges the RES pin capacitor to ground. If cycle-by-
cycle current limit threshold is exceeded during any PWM cycle, the
Hiccup Mode Restart
10
RES
current sink is disabled and RES capacitor is charged by an internal 50 µA
(LM25088-2 Only)
current. If the RES voltage reaches 1.2V, the HG pin gate drive signal will
be disabled and the RES pin capacitor will be discharged by a 1 µA
current sink. Normal operation will resume when the RES pin falls below
0.2V.
11
CSG
Current Sense Ground
Low side reference for the current sense resistor.
Current measurement connection for the re-circulating diode. An external
sense resistor and an internal sample/hold circuit sense the diode current
12
CS
Current sense
at the conclusion of the buck switch off-time. This current measurement
provides the DC offset level for the emulated current ramp.
13
SW
Switching node
Connect to the source terminal of the external MOSFET switch.
14
HG
High Gate
Connect to the gate terminal of the external MOSFET switch.
An external capacitor is required between the BOOT and the SW pins to
Input for bootstrap
15
BOOT
provide bias to the MOSFET gate driver. The capacitor is charged from
capacitor
VCC via an internal diode during the off-time of the buck switch.
VCC tracks VIN up to the regulation level (7.8V Typ). A 0.1 µF to 10 µF
Output of the bias
ceramic decoupling capacitor is required. An external voltage between
16
VCC
regulator
8.3V and 13V can be applied to this pin to reduce internal power
dissipation.
4
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Product Folder Links: LM25088 LM25088-Q1


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