r5896 - trunk/gta02-core/bom/research

[werner at docs.openmoko.org]

Author: werner
Date: 2010-04-04 09:15:09 +0200 (Sun, 04 Apr 2010)
New Revision: 5896

Modified:
   trunk/gta02-core/bom/research/STATUS
   trunk/gta02-core/bom/research/u4905
Log:
Researched the Richtek RT9711BPB



Modified: trunk/gta02-core/bom/research/STATUS
===================================================================
--- trunk/gta02-core/bom/research/STATUS	2010-04-04 06:29:10 UTC (rev 5895)
+++ trunk/gta02-core/bom/research/STATUS	2010-04-04 07:15:09 UTC (rev 5896)
@@ -9,7 +9,6 @@
 JAR02-062101		jk4401		manuf. may be dead, inc. subst. likely
 PCF50633HN/04/N3,5	u1701		large minimum order
 PPR06-023104
-RT9711BPB		u4905		not researched yet
 SC32442B54		u1501		not found yet, brokers list it
 TD028TTEC1		lcm		not found yet, brokers list it
 WM3236AQ		u8001		not found yet
@@ -30,11 +29,15 @@
 IT3205BE		x7601		not found, sub. expens	X - - - -
 R3113D241A-TR-F		u7604		not found yet		X - X - -
 RT9013-12PB		u1702		not found yet		- - 2 - -
+RT9711BPB		u4905		not found yet		- - X - 3
+(other replacement)						X - X 4 -
 SN74AUP1G00DCKR		u4902		borderline availab.	X - - - -
 WTE06016		ant8001		not found		X X ? - -
 
 1) No fault indication
 2) Pin NC in original has function
+3) Lower maximum current
+4) Additional bypass capacitors recommended
 
 
 OPTIMIZATION:

Modified: trunk/gta02-core/bom/research/u4905
===================================================================
--- trunk/gta02-core/bom/research/u4905	2010-04-04 06:29:10 UTC (rev 5895)
+++ trunk/gta02-core/bom/research/u4905	2010-04-04 07:15:09 UTC (rev 5896)
@@ -3,3 +3,25 @@
 research needed.
 
 RT9711BPB           LNR-IC POWER SWITCH RT9711BPB 1.5A SOT-23-5 5PIN RICH
+
+A close relative, with different pinout:
+
+- Micrel MIC2005-1.2LYM5
+  http://www.micrel.com/_PDF/mic20xx.pdf
+
+Different package:
+
+- Diodes Inc. AP2181
+  http://www.diodes.com/datasheets/AP2181_91.pdf
+
+- Diodes Inc. AP2101
+  http://www.diodes.com/datasheets/AP2101_2111.pdf
+
+		Package		Imax	Ron	Vmax	Enable
+RT9711BPB	SOT-23-5	1.5 A	 80 mR	5.5 V	L
+MIC2005-1.2LYM5	SOT-23-5	1.2 A	 70 mR	5.5 V	L
+AP2181		6-DFN, others	1.5 A	 95 mR	5.5 V	L
+AP2101		8-MSOP, others	2.0 A	 90 mR	5.5 V	L
+
+Imax is the recommended continuous current.
+Ron is the typical on resistance.