XC9511A1434 TOREX [Torex Semiconductor], XC9511A1434 Datasheet

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XC9511A1434

Manufacturer Part Number
XC9511A1434
Description
Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector
Manufacturer
TOREX [Torex Semiconductor]
Datasheet
1.XC9511A1434.pdf (35 pages)
XC9511
Synchronous Step-Down DC/DC Converter
with Built-In LDO Regulator In Parallel Plus Voltage Detector
■TYPICAL APPLICATION CIRCUIT
■GENERAL DESCRIPTION
The XC9511 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in parallel with the
DC/DC converter's output. A voltage detector is also built-in. Since the input for the LDO voltage regulator block comes
from the input power supply, it is suited for use with various applications.
The DC/DC converter block incorporates a P-channel driver transistor and a synchronous N-channel switching transistor.
With an external coil, diode and two capacitors, the XC9511 can deliver output currents up to 800mA at efficiencies over 90%.
The XC9511 is designed for use with small ceramic capacitors.
A choice of three switching frequencies are available, 300 kHz, 600 kHz, and 1.2 MHz. Output voltage settings for the DC/DC
and VR are set-up internally in 100mV steps within the range of 0.9V to 4.0V (±2.0%). For the VD, the range is of 0.9V to
5.0V (±2.0%). The soft start time of the series is internally set to 5ms. With the built-in U.V.L.O. (Under Voltage Lock Out)
function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.4 V or lower.
■APPLICATIONS
●CD-R / RW, DVD
●HDD
●PDAs, portable communication modem
●Palmtop computers
●Cellular phones
●Cameras, video recorders
* Please refer to the typical application circuit when
external components are selected.
SOP-8 (TOP VIEW)
Series
■FEATURES
DC/DC Converter with Built-in LDO and VD Function
Input Voltage Range
Low ESR Capacitor
VD Function
Package
<DC/DC Converter Block>
Output Voltage Range : 0.9V ~ 4.0V (Accuracy ± 2%)
Output Current
Control Method
Oscillation Frequency : 300kHz, 600kHz, 1.2MHz
<Regulator Block>
Regulator Input
Output Voltage Range : 0.9V ~ 4.0V (Accuracy±2%)
Current Limit
Dropout Voltage
High Ripple Rejection : 60dB @1kHz (V
■TYPICAL PERFORMANCE
C
CHARACTERISTICS
IN
: 4.7μF(ceramic), C
XC9511Axxx
V
IN
=5.0V, Topr=25
L
1: 10μF(ceramic), C
: 2.4V ~ 6.0V
: Ceramic capacitor compatible
: Three VD sensing Options for either
: SOP-8
: 800mA
: PWM or PWM/PFM Selectable
: Parallel Input to DC/DC converter
: 600mA
: 160mV@I
V
DD
, D
o
C, L: 4.7μH(CDRH4D28C)
COUT
OUT
L
2: 4.7μF(ceramic)
, or V
=200mA (V
OUT
ROUT
=2.8V)
ETR1008_001
OUT
1/35
=2.8V)

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XC9511A1434 Summary of contents

Page 1

XC9511 Series Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Parallel Plus Voltage Detector ■GENERAL DESCRIPTION The XC9511 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in parallel with the DC/DC converter's output. A ...

Page 2

XC9511 Series ■PIN CONFIGURATION PGND 1 PVDD 2 AVDD 3 VDOUT 4 SOP-8 (TOP VIEW) ■PIN ASSIGNMENT PIN NUMBER PIN NAME 1 P GND 2 P VDD 3 A VDD 4 V DOUT 5 A GND 6 V ROUT 7 ...

Page 3

DIAGRAM * Diodes shown in the above circuit are protective diodes ■ABSOLUTE MAXIMUM RATINGS PARAMETER A Pin Voltage VDD P Pin Voltage VDD D Pin Voltage COUT V Pin Voltage ROUT V Pin Current ROUT V Pin Voltage DOUT ...

Page 4

XC9511 Series ■ELECTRICAL CHARACTERISTICS XC9511xxxCSx ●Common Characteristics PARAMETER SYMBOL Supply Current 1 Supply Current 2 Input Voltage Range ●DC/DC Converter (1.5V product) PARAMETER SYMBOL Output Voltage DC Oscillation Frequency Maximum Duty Ratio MAXDUTY Minimum Duty Ratio MINDUTY PFM Duty Ratio ...

Page 5

CHARACTERISTICS (Continued) XC9511xxxCSx (Continued) ●Regulator (3.3V product) PARAMETER SYMBOL Output Voltage VR OUT Maximum Output Current Imax2 Load Regulation VR Dropout Voltage 1 (*5) Vdif 1 Dropout Voltage 2 Vdif 2 VROUT Line Regulation V ・VR IN Current Limit ...

Page 6

XC9511 Series ■TEST CIRCUITS Circuit 1 Supply Current Circuit 3 Output Voltage (DC/DC) Oscillation Frequency, U.V.L.O. Voltage, Soft start Time Maximum Output Current, Efficiency, (PFM Duty Cycle), Circuit Resistance 6/35 Circuit 2 Output Voltage (VR), Load Regulation, ...

Page 7

CIRCUITS (Continued) Circuit 7 Current Limit 2 (VR), Short Current (VR) Circuit 9 VD Output Current * For the measurement of the VDD_Sense products, the input voltage was controlled. Circuit 11 Off-Leak Circuit 8 Detect Voltage, Release Voltage (Hysteresis ...

Page 8

XC9511 Series ■TYPICAL APPLICATION CIRCUIT SOP-8 (TOP VIEW 4.7μF (ceramic, TAIYO YUDEN) SD *1: XB0ASB03A1BR (TOREX) *1 The DC/DC converter of the XC9511 series automatically switches between synchronous / non-synchronous. The Schottky diode is not normally needed. However, ...

Page 9

EXPLANATION (Continued) <Synchronous / Non-synchronous> The XC9511 series automatically switches between synchronous / non-synchronous according to the state of the DC/DC converter. Highly efficient operations are achievable using the synchronous mode while the coil current continuous ...

Page 10

XC9511 Series ■OPERATIONAL EXPLANATION (Continued) <U.V.L.O. Circuit> When the V pin voltage becomes 1 lower, the P-channel output driver transistor is forced OFF to prevent false IN pulse output caused by unstable operation of the internal circuitry. When ...

Page 11

ON USE ●Application Information 1. The XC9511 series is designed for use with a ceramic output capacitor. If, however, the potential difference between dropout voltage or output current is too large, a ceramic capacitor may fail to absorb the ...

Page 12

XC9511 Series ■NOTES ON USE (Continued) ●Application Information (Continued) 6. When the XC9511D to F series operate in PWM/PFM automatic switching control mode, the reverse current may become quite high around the load current value when synchronous switches to non-synchronous ...

Page 13

ON USE (Continued) ●Application Information (Continued) 14. Should the bi-directional load current of the synchronous DC/DC converter and the regulator become large, please be careful of the power dissipation when in use. Please calculate power dissipation by using the ...

Page 14

XC9511 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (A) DC/DC CONVERTER (1) Efficiency vs. Output Current 14/35 ...

Page 15

PERFORMANCE CHARACTERISTICS (Continued) (A) DC/DC CONVERTER (Continued) (2) Output Voltage vs. Output Current XC9511 Series 15/35 ...

Page 16

XC9511 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (A) DC/DC CONVERTER (Continued) (3) Output Voltage vs. Ripple Voltage 16/35 ...

Page 17

PERFORMANCE CHARACTERISTICS (Continued) (A) DC/DC CONVERTER (Continued) (4) Output Voltage vs. Ambient Temperature (5) Soft-Start Time vs. Ambient Temperature XC9511 Series 17/35 ...

Page 18

XC9511 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (A) DC/DC CONVERTER (Continued) (6) LX Pch/Nch On Resistance vs. Input Voltage (7) Oscillation Frequency vs. Ambient Temperature Ambient Temperature :Ta(℃) 18/35 (8) U.V.L.O. Voltage vs. Ambient Temperature Ambient Temperature :Ta(℃) ...

Page 19

PERFORMANCE CHARACTERISTICS (Continued) (A) DC/DC CONVERTER (Continued) (9-1) DC/DC Load Transient Response (D (a) PWM Control* (*XC9511A/B/C series) (b) PWM/PFM Automatic Switching Control* (*XC9511D/E/F series) : 1.5V, FOSC: 1.2MHz) COUT XC9511 Series 19/35 ...

Page 20

XC9511 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (A) DC/DC CONVERTER (Continued) (9-2) DC/DC Load Transient Response (D (a) PWM Control* (*XC9511A/B/C series) (b) PWM/PFM Automatic Switching Control* (*XC9511D/E/F series) 20/35 : 1.8V, FOSC: 1.2MHz) COUT ...

Page 21

PERFORMANCE CHARACTERISTICS (Continued) (A) DC/DC CONVERTER (Continued) (9-3) DC/DC Load Transient Response (D (a) PWM Control* (*XC9511A/B/C series) (b) PWM/PFM Automatic Switching Control* (*XC9511D/E/F series) : 3.3V, FOSC: 600kHz) COUT XC9511 Series 21/35 ...

Page 22

XC9511 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (A) DC/DC CONVERTER (Continued) (9-4) DC/DC Load Transient Response (D (a) PWM Control* (*XC9511A/B/C series) (b) PWM/PFM Automatic Switching Control* (*XC9511D/E/F series) 22/35 : 1.5V, FOSC: 600kHz) COUT ...

Page 23

PERFORMANCE CHARACTERISTICS (Continued) (A) DC/DC CONVERTER (Continued) (9-5) DC/DC Load Transient Response (D (a) PWM Control* (*XC9511A/B/C series) (b) PWM/PFM Automatic Switching Control* (*XC9511D/E/F series) : 1.8V, FOSC: 600kHz) COUT XC9511 Series 23/35 ...

Page 24

XC9511 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (A) DC/DC CONVERTER (Continued) (9-6) DC/DC Load Transient Response (D (a) PWM Control* (*XC9511A/B/C series) (b) PWM/PFM Automatic Switching Control* (*XC9511D/E/F series) 24/35 : 3.3V, FOSC: 600kHz) COUT ...

Page 25

PERFORMANCE CHARACTERISTICS (Continued) (B) VOLTAGE REGULATOR (1) Output Voltage vs. Input Voltage XC9511 Series 25/35 ...

Page 26

XC9511 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (B) VOLTAGE REGULATOR (Continued) (2) Output Voltage vs. Output Current (Current Limit) 26/35 ...

Page 27

PERFORMANCE CHARACTERISTICS (Continued) (B) VOLTAGE REGULATOR (Continued) (3) Dropout Voltage vs. Output Current XC9511 Series Ta=-40℃ 27/35 ...

Page 28

XC9511 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (B) VOLTAGE REGULATOR (Continued) (4) Output Voltage vs. Output Current 28/35 ...

Page 29

PERFORMANCE CHARACTERISTICS (Continued) (B) VOLTAGE REGULATOR (Continued) (5) Ripple Rejection Ratio vs. Ripple Frequency XC9511 Series 29/35 ...

Page 30

XC9511 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (B) VOLTAGE REGULATOR (Continued) (6) VR Load Transient Response 30/35 ...

Page 31

PERFORMANCE CHARACTERISTICS (Continued) (C) VOLTAGE DETECTOR (1) Output Current vs. Input Voltage (2) Detect Voltage vs. Input Voltage XC9511 Series 31/35 ...

Page 32

XC9511 Series ■TYPICAL PERFORMANCE CHARACTERISTICS (Continued) (C) VOLTAGE DETECTOR (Continued) (3) Detect Voltage, Release Voltage vs. Ambient Temperature 32/35 ...

Page 33

PERFORMANCE CHARACTERISTICS (Continued) (D) COMMON (1) Supply Current vs. Ambient Temperature (DC/DC & VR & VD) XC9511 Series 33/35 ...

Page 34

XC9511 Series ■PACKAGING INFORMATION ●SOP-8 ■MARKING RULE ●SOP-8 SOP-8 (TOP VIEW) 34/35 ①②Represents product series MARK ① ② ③Represents DC/DC control methods, MODE pin and VD sense pin MARK DC/DC CONTROL A PWM Control PWM, ...

Page 35

The products and product specifications contained herein are subject to change without notice to improve performance characteristics. Consult us, or our representatives before use, to confirm that the information in this catalog date assume ...

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