首页 > 产品中心 > 电源管理芯片 > DC-DC转换器 > CXSD62104双降压恒时同步的PWM控制器两个低损耗稳压器PWM1和PWM2的输出可以从2V调整到5.5V

CXSD62104双降压恒时同步的PWM控制器两个低损耗稳压器PWM1和PWM2的输出可以从2V调整到5.5V

产品型号：	CXSD62104
产品类型：	DC-DC转换器
产品系列：	Buck降压型芯片
产品状态：	量产
浏览次数：	48 次

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产品简介

CXSD62104集成了双降压、恒定时间、同步PWM控制器（为每个通道驱动双N通道mosfet）和
两个低损耗稳压器以及各种保护装置集成到一个芯片中。PWM控制器降低电池的高电压以产生NB的低电压应用。PWM1和PWM2的输出可以从2V调整到5.5V通过设置一个从VOUTx到GND的电阻分压器。线性调节器为备用电源提供5V和3.3V输出

技术参数

输入电压范围 (VIN)	≤ 6~25V
输出电压 (VOUT)	ADJV
输出电流 (IOUT)	15A
工作频率	1500 Hz
转换效率	95%%
封装类型	TQFN4x4-24
Topology	Buck COT降压型芯片
Control method	No. of PWM Outputs:2
Switching frequency	1500
Protection	Phase: 1
Features	静态工作电流 Quiescent Current (typ)(uA):550
Application	Bias Voltage (typ) (V):N
Operating temp	-40℃~125℃
Reference design	反馈电压Reference Voltage(V):2

产品详细介绍

1.产品概述         2.产品特点
3.应用范围       4.下载产品资料PDF文档
5.产品封装图                     6.电路原理图
7.功能概述       8.相关产品

一,产品概述(General Description)

The CXSD62104 integrates dual step-down, constant-ontime, synchronous

PWM controllers (that drives dual N-channel MOSFETs for each channel) and
two low drop-out regulators as well as various protections into a chip.The PWM
controllers step down high voltage of a battery to generate low-voltage for NB
applications. The output of PWM1 and PWM2 can be adjusted from 2V to 5.5V
by setting a resistive voltage-divider from VOUTx to GND.The linear regulators
provide 5V and 3.3V output for standby power supply. The linear regulators

provide up to 100mA output current. When the PWMx output voltage is higher

than LDOx bypass threshold, the related LDOx regulator is shut off and its

output is connected to VOUTx by internal switchover MOSFET. It can save power dissipation.
The CXSD62104 provides excellent transient response and accurate DC

output voltage in either PFM or PWM Mode.In Pulse-Frequency Mode (PFM),

the CXSD62104 provides very high efficiency over light to heavy loads with

loading-modulated switching frequencies. The Forced-PWM mode works nearly

at constant frequency for low-noise requirements. The unique ultrasonic mode

maintains the switching frequency above 25KHz, which eliminates noise in audio applications.

The CXSD62104 is equipped with accurate sourcing cur-rent-limit, output

under-voltage and output over-voltage protections, being perfect for NB

applications. A 1.7ms (typ.) digital soft-start can reduce the start-up current.

A soft-stop function actively discharges the output capaci-tors by the discharge

device. The CXSD62104 has individual enable controls for PWM channels and

LDOs. Pulling both ENPWM pin and ENLDO pin low shuts down the whole chip

with low quiescent current close to zero.
The CXSD62104 is available in a TQFN4x4-24A package.
二.产品特点(Features)
Wide Input Voltage Range from 6V to 25V
Provide 4 Independent Outputs with ±1.5% Accu-
racy Over-Temperature
- PWM1 Controller with Adjustable (2V to 5.5V) Out-put
PWM2 Controller with Adjustable (2V to 5.5V) Out-put
100mA Low Dropout Regulator (LDO5) with Fixed 5V Output
100mA Low Dropout Regulator (LDO3) with Fixed 3.3V Output
Excellent Line/Load Regulations about ±1.5% Over-Temperature Range
±1%, (±1.5%, 50μA) 2.0V Reference Voltage Output
Built-In POR Control Scheme Implemented
Selectable Forced-PWM or Automatic PFM/PWM
(with Selectable Ultrasonic Operation)
Constant-On-Time Control Scheme with Frequency
Compensation for PWM Mode
Selectable Switching Frequency in PWM Mode
Built-in Digital Soft-Start for PWM Outputs and Soft-
Stop for PWM Outputs and LDO Outputs
Integrated Bootstrap Forward P-CH MOSFET
High Efficiency over Light to Full Load Range (PWMs)
Built-in Power Good Indicators (PWMs)
Independent Enable Inputs (PWMs, LDO)

70% Under-Voltage and 125% Over-Voltage Protec-tions (PWM)

Adjustable Current-Limit Protection (PWMs)
- Using Sense Low-Side MOSFET’s RDS(ON)
Over-Temperature Protection
4mmx4mm Thin QFN-24 (TQFN4x4-24A) package
Lead Free and Green Device Available (RoHS Compliant)

三,应用范围 (Applications)

Notebook and Sub-Notebook Computers

Portable Devices
DDR1, DDR2, and DDR3 Power Supplies
3-Cell and 4-Cell Li+ Battery-Powered Devices
Graphic Cards
Game Consoles
Telecommunications

四.下载产品资料PDF文档

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！

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五,产品封装图 (Package)

六.电路原理图

七,功能概述

Input Capacitor Selection
The input capacitor is chosen based on the voltage rating and the RMS current rating. For reliable operation, select
the capacitor voltage rating to be at least 1.3 times higher than the maximum input voltage. The maximum RMS
current rating requirement is approximately IOUT/2, where IOUT is the load current. During power up, the input capaci-tors have to handle large amount of surge current. In low-duty notebook appliactions, ceramic capacitors are
remmended. The capacitors must be connected between the drain of high-side MOSFET and the source of low-
side MOSFET with very low-impeadance PCB layout.
MOSFET Selection
The application for a notebook battery with a maximum volt-age of 24V, at least a minimum 30V MOSFETs should
be used. The design has to trade off the gate charge with the RDS(ON) of the MOSFET:
· For the low-side MOSFET, before it is turned on, the body diode has been conducted. The low-side MOSFET
driver will not charge the miller capacitor of this MOSFET.
In the turning off process of the low-side MOSFET,the load current will shift to the body diode first. The
high dv/dt of the phase node voltage will charge the miller capacitor through the low-side MOSFET driver
sinking current path. This results in much less switching loss of the low-side MOSFETs. The duty
cycle is often very small in high battery voltage applications, and the low-side MOSFET will con-
duct most of the switching cycle; therefore, the less the RDS(ON) of the low-side MOSFET, the less the power
loss. The gate charge for this MOSFET is usually a secondary consideration. The high-side MOSFET
does not have this zero voltage switching condition, and because it conducts for less time
compared to the low-side MOSFET, the switching loss tends to be dominant. Priority should be given
to the MOSFETs with less gate charge, so that both the gate driver loss and switching loss will be minimized.
The selection of the N-channel power MOSFETs are de-termined by the RDS(ON), reversing transfer capacitance
(CRSS) and maximum output current requirement. The losses in the MOSFETs have two components: conduc-
tion loss and transition loss. For the high-side and low-side MOSFETs, the losses are approximately given by
the following equations:
Layout Consideration
In any high switching frequency converter, a correct layout is important to ensure proper operation of the regulator.
With power devices switching at higher frequency, the resulting current transient will cause voltage spike across
the interconnecting impedance and parasitic circuit elements. As an example, consider the turn-off transition
of the PWM MOSFET. Before turn-off condition, the MOSFET is carrying the full load current. During turn-off,
current stops flowing in the MOSFET and is freewheeling by the lower MOSFET and parasitic diode. Any parasitic
inductance of the circuit generates a large voltage spike during the switching interval. In general, using short and
wide printed circuit traces should minimize interconnect-ing impedances and the magnitude of voltage spike. And
signal and power grounds are to be kept separating and finally combined to use the ground plane construction or

single point grounding. The best tie-point between the signal ground and the power ground is at the negative
side of the output capacitor on each channel, where there is less noise. Noisy traces beneath the IC are not
recommended. Below is a checklist for your layout:
Layout Consideration (Cont.)
Keep the switching nodes (UGATEx, LGATEx, BOOTx,and PHASEx) away from sensitive small signal nodes
(REF, ILIMx, and FBx) since these nodes are fast mov-ing signals. Therefore, keep traces to these nodes as
short as possible and there should be no other weak signal traces in parallel with theses traces on any layer.

Minimizing the impedance with wide layout plane be-tween the two pads reduces the voltage bounce of

CXSD62104

八,相关产品 更多同类产品......

Switching Regulator > Buck Controller
Part_No	Package	Archi tectu	Phase	No.of PWM Output	Output Current (A)	Input Voltage (V)		Reference Voltage (V)	Bias Voltage (V)	Quiescent Current (uA)
Part_No	Package	Archi tectu	Phase	No.of PWM Output	Output Current (A)	min	max	Reference Voltage (V)	Bias Voltage (V)	Quiescent Current (uA)
CXSD6273	SOP-14 QSOP-16 QFN4x4-16	VM	1	1	30	2.9	13.2	0.9	12	8000
CXSD6274	SOP-8	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6274C	SOP-8	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6275	QFN4x4-24	VM	2	1	60	3.1	13.2	0.6	12	5000
CXSD6276	SOP-8	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6276A	SOP-8	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6277/A/B	SOP8\|TSSOP8	VM	1	1	5	5	13.2	1.25\|0.8	5~12	3000
CXSD6278	SOP-8	VM	1	1	10	3.3	5.5	0.8	5	2100
CXSD6279B	SOP-14	VM	1	1	10	5	13.2	0.8	12	2000
CXSD6280	TSSOP-24 \|QFN5x5-32	VM	1	2	20	5	13.2	0.6	5~12	4000
CXSD6281N	SOP14 QSOP16 QFN-16	VM	1	1	30	2.9	13.2	0.9	12	4000
CXSD6282	SOP-14	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6282A	SOP-14	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6283	SOP-14	VM	1	1	25	2.2	13.2	0.8	12	5000
CXSD6284/A	LQFP7x7 48 TQFN7x7-48	VM	1	6	0.015	1.4	6.5	-	5	1800
CXSD6285	TSSOP-24P	VM	1	2	20	2.97	5.5	0.8	5~12	5000
CXSD6286	SOP-14	VM	1	1	10	5	13.2	0.8	12	3000
CXSD6287	SOP-8-P\|DIP-8	VM	1	1	30	2.9	13.2	1.2	12	3000
CXSD6288	SSOP28 QFN4x4-24	VM	1	2	20	5	24	0.9	5	1200
CXSD6289	SOP-20	VM	1	2	20	2.2	13.2	0.6	5~12	4000
CXSD6290	SOP8\|DFN3x3-10	VM	1	2	-	-	-	-	5~12	550
CXSD6291HC	DIP8\|SOP-8	VM	1	1	1	1.2	9	24	5	9 ~ 24
CXSD6292	SSOP16 QFN4x4-16 TQFN3x3-16	VM	1	1	25	3	25	0.6	5	1700
CXSD6293	TDFN3x3-10	COT	1	1	25	3	25	0.5	5	350
CXSD6294	QFN4x4-24	CM	2	1	40	4.5	13.2	0.6	5~12	4000
CXSD6295	SOP8P TDFN3x3-10	VM	1	1	20	3	13.2	0.8	5~12	2500
CXSD6296A\|B\|C\|D	SOP8P	VM	1	1	25	3	13.2	0.6\|0.8	5~12	1200
CXSD6297	TDFN3x3-10	VM	1	1	25	4	13.2	0.8	5~12	2000
CXSD6298	TDFN3x3-10	COT	1	1	25	4.5	25	0.6	5~12	80
CXSD6299\|A	SOP-8P	VM	1	1	25	4.5	13.2	0.8	5~12	16000
CXSD62100	TQFN3x3-10	VM	1	1	25	4.5	13.2	0.6	5~12	2500
CXSD62101\|L	TDFN3x3-10	COT	1	1	30	3	25	0.8	5~12	2000
CXSD62102	TQFN3x3-16	COT	1	1	30	1.8	28	0.6	5	600
CXSD62102A	TQFN 3x3 16	COT	1	1	30	1.8	28	0.6	5	600
CXSD62103	QFN4x4-24	VM	2	1	50	4.5	13.2	0.6	5~12	5000
CXSD62104	TQFN4x4-24	COT	1	2	15	6	25	2	N	550
CXSD62105	TQFN4x4-24	COT	1	2	15	6	25	2	N	550
CXSD62106\|A	TQFN4x4-4 TQFN3x3-20	COT	1	2	20	3	28	0.75	5	800
CXSD62107	TQFN3x3-16	COT	1	1	20	1.8	28	0.75	5	400
CXSD62108	QFN3.5x3.5-14 TQFN3x3-16	COT	1	1	20	1.8	28	0.75	5	400
CXSD62109	TQFN3x3-16	COT	1	2	20	1.8	28	0.75	5	400
CXSD62110	QFN3x3-20 TQFN3x3-16	COT	1	2	20	3	28	1.8\|1.5\|0.5	5	740
CXSD62111	TQFN4x4-24 \|QFN3x3-20	CM	1	2	15	5	28	0.5	N	3000
CXSD62112	TDFN3x3-10	COT	1	1	20	1.8	28	0.5	5	250
CXSD62113\|C	TQFN3x3-20	COT	1	2	15	6	25	2	N	550
CXSD62113E	TQFN 3x3 20	COT	2	2	11	6	25	2	N	550
CXSD62114	TQFN3x3-20	COT	2	2	11	5.5	25	2	N	280
CXSD62115	QFN4x4-24	VM	2	1	60	3.1	13.2	0.85	12	5000
CXSD62116A\|B\|C	SOP-8P	VM	1	1	20	2.9	13.2	0.8	12	16000
CXSD62117	SOP-20	VM	2	2	30	10	13.2	1	12	5000
CXSD62118	TDFN3x3-10	COT	1	1	25	1.8	28	0.7	5	250
CXSD62119	TQFN3x3-20	COT	2	1	40	1.8	25	REFIN Setting	5	700
CXSD62120	QFN 3x3 20 TQFN 3x3 16	COT	1	2	20	3	28	1.8\|1.5 1.35\|1.2 0.5	5	800
CXSD62121A	TQFN3x3 20	COT	1	2	15	3	28	0.75	5	220
CXSD62121B	TQFN3x3 20	COT	1	2	15	3	28	0.75	5	220
CXSD62121	TQFN3x3-20	COT	1	2	20	3	28	0.75	5	180

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CXSD62104双降压恒时同步的PWM控制器两个低损耗稳压器PWM1和PWM2的输出可以从2V调整到5.5V

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