r5895 - trunk/gta02-core/bom/research

werner at docs.openmoko.org werner at docs.openmoko.org
Sun Apr 4 08:29:10 CEST 2010


Author: werner
Date: 2010-04-04 08:29:10 +0200 (Sun, 04 Apr 2010)
New Revision: 5895

Added:
   trunk/gta02-core/bom/research/u1702
Modified:
   trunk/gta02-core/bom/research/STATUS
Log:
Researched the Richtek RT9013-12PB



Modified: trunk/gta02-core/bom/research/STATUS
===================================================================
--- trunk/gta02-core/bom/research/STATUS	2010-04-04 05:44:33 UTC (rev 5894)
+++ trunk/gta02-core/bom/research/STATUS	2010-04-04 06:29:10 UTC (rev 5895)
@@ -9,7 +9,6 @@
 JAR02-062101		jk4401		manuf. may be dead, inc. subst. likely
 PCF50633HN/04/N3,5	u1701		large minimum order
 PPR06-023104
-RT9013-12PB
 RT9711BPB		u4905		not researched yet
 SC32442B54		u1501		not found yet, brokers list it
 TD028TTEC1		lcm		not found yet, brokers list it
@@ -23,17 +22,19 @@
 					 of substitute only	| Mech| Functn
 					 if indicated)		| | Pins|
 ----------------------	--------------	----------------------  +-+-+-+-+------
-AAT1275IRN-5.0-T1	u4904		not found yet		X - X X 1)
+AAT1275IRN-5.0-T1	u4904		not found yet		X - X X 1
 BF2520-B2R4CAB/LF	u8002		not found yet		X - - - -
 BTP-03JA4G		con1701		no distributor		X ? ? - -
 FA2012-KR40PAA		u6007		not found yet		X - - - -
 HT-210UD/NB		led1501		long lead time		X - X ? colors
 IT3205BE		x7601		not found, sub. expens	X - - - -
 R3113D241A-TR-F		u7604		not found yet		X - X - -
+RT9013-12PB		u1702		not found yet		- - 2 - -
 SN74AUP1G00DCKR		u4902		borderline availab.	X - - - -
 WTE06016		ant8001		not found		X X ? - -
 
 1) No fault indication
+2) Pin NC in original has function
 
 
 OPTIMIZATION:

Added: trunk/gta02-core/bom/research/u1702
===================================================================
--- trunk/gta02-core/bom/research/u1702	                        (rev 0)
+++ trunk/gta02-core/bom/research/u1702	2010-04-04 06:29:10 UTC (rev 5895)
@@ -0,0 +1,17 @@
+U1702: Richtek RT9013-12PB
+
+The RT9013 is used to regulate IO_1V8 down to STBY_1V2. Interestingly,
+the chip is specified with a minimum input voltage of 2.2 V. However,
+this seems to contradict the Vdrop of 250 mV. The data sheet doesn't
+indicate how to resolve this conflict.
+
+Alternatives with the same package, similar pinout, but a lower minimum
+input voltage, and a lower maximum current:
+
+- ON Semiconductor NCP585DSN12T1G or NCP585HSN12T1G
+  http://www.onsemi.com/pub_link/Collateral/NCP585-D.PDF
+  (note: pin 4 is NC in the RT9013 but "ECO" in the NCP585)
+
+		Package		Vmin	Vdrop	Imax	Caps	Enable
+RT9013-12PB	SOT-23-5	2.2 V	250 mV	500 mA	2 x 1uF	H
+NCP585DSN12T1G	SOT-23-5	1.4 V	~400 mV	300 mA	2 x 1uF	H




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